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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved.
7 * Copyright (C) 2013 Imagination Technologies Ltd.
8 *
9 * VPE spport module for loading a MIPS SP program into VPE1. The SP
10 * environment is rather simple since there are no TLBs. It needs
11 * to be relocatable (or partiall linked). Initialize your stack in
12 * the startup-code. The loader looks for the symbol __start and sets
13 * up the execution to resume from there. To load and run, simply do
14 * a cat SP 'binary' to the /dev/vpe1 device.
15 */
16#include <linux/kernel.h>
17#include <linux/device.h>
18#include <linux/fs.h>
19#include <linux/init.h>
20#include <linux/slab.h>
21#include <linux/list.h>
22#include <linux/vmalloc.h>
23#include <linux/elf.h>
24#include <linux/seq_file.h>
25#include <linux/syscalls.h>
26#include <linux/moduleloader.h>
27#include <linux/interrupt.h>
28#include <linux/poll.h>
29#include <linux/bootmem.h>
30#include <asm/mipsregs.h>
31#include <asm/mipsmtregs.h>
32#include <asm/cacheflush.h>
33#include <linux/atomic.h>
34#include <asm/mips_mt.h>
35#include <asm/processor.h>
36#include <asm/vpe.h>
37
38#ifndef ARCH_SHF_SMALL
39#define ARCH_SHF_SMALL 0
40#endif
41
42/* If this is set, the section belongs in the init part of the module */
43#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
44
45struct vpe_control vpecontrol = {
46 .vpe_list_lock = __SPIN_LOCK_UNLOCKED(vpe_list_lock),
47 .vpe_list = LIST_HEAD_INIT(vpecontrol.vpe_list),
48 .tc_list_lock = __SPIN_LOCK_UNLOCKED(tc_list_lock),
49 .tc_list = LIST_HEAD_INIT(vpecontrol.tc_list)
50};
51
52/* get the vpe associated with this minor */
53struct vpe *get_vpe(int minor)
54{
55 struct vpe *res, *v;
56
57 if (!cpu_has_mipsmt)
58 return NULL;
59
60 res = NULL;
61 spin_lock(&vpecontrol.vpe_list_lock);
62 list_for_each_entry(v, &vpecontrol.vpe_list, list) {
63 if (v->minor == VPE_MODULE_MINOR) {
64 res = v;
65 break;
66 }
67 }
68 spin_unlock(&vpecontrol.vpe_list_lock);
69
70 return res;
71}
72
73/* get the vpe associated with this minor */
74struct tc *get_tc(int index)
75{
76 struct tc *res, *t;
77
78 res = NULL;
79 spin_lock(&vpecontrol.tc_list_lock);
80 list_for_each_entry(t, &vpecontrol.tc_list, list) {
81 if (t->index == index) {
82 res = t;
83 break;
84 }
85 }
86 spin_unlock(&vpecontrol.tc_list_lock);
87
88 return res;
89}
90
91/* allocate a vpe and associate it with this minor (or index) */
92struct vpe *alloc_vpe(int minor)
93{
94 struct vpe *v;
95
96 v = kzalloc(sizeof(struct vpe), GFP_KERNEL);
97 if (v == NULL)
98 goto out;
99
100 INIT_LIST_HEAD(&v->tc);
101 spin_lock(&vpecontrol.vpe_list_lock);
102 list_add_tail(&v->list, &vpecontrol.vpe_list);
103 spin_unlock(&vpecontrol.vpe_list_lock);
104
105 INIT_LIST_HEAD(&v->notify);
106 v->minor = VPE_MODULE_MINOR;
107
108out:
109 return v;
110}
111
112/* allocate a tc. At startup only tc0 is running, all other can be halted. */
113struct tc *alloc_tc(int index)
114{
115 struct tc *tc;
116
117 tc = kzalloc(sizeof(struct tc), GFP_KERNEL);
118 if (tc == NULL)
119 goto out;
120
121 INIT_LIST_HEAD(&tc->tc);
122 tc->index = index;
123
124 spin_lock(&vpecontrol.tc_list_lock);
125 list_add_tail(&tc->list, &vpecontrol.tc_list);
126 spin_unlock(&vpecontrol.tc_list_lock);
127
128out:
129 return tc;
130}
131
132/* clean up and free everything */
133void release_vpe(struct vpe *v)
134{
135 list_del(&v->list);
136 if (v->load_addr)
137 release_progmem(v);
138 kfree(v);
139}
140
141/* Find some VPE program space */
142void *alloc_progmem(unsigned long len)
143{
144 void *addr;
145
146#ifdef CONFIG_MIPS_VPE_LOADER_TOM
147 /*
148 * This means you must tell Linux to use less memory than you
149 * physically have, for example by passing a mem= boot argument.
150 */
151 addr = pfn_to_kaddr(max_low_pfn);
152 memset(addr, 0, len);
153#else
154 /* simple grab some mem for now */
155 addr = kzalloc(len, GFP_KERNEL);
156#endif
157
158 return addr;
159}
160
161void release_progmem(void *ptr)
162{
163#ifndef CONFIG_MIPS_VPE_LOADER_TOM
164 kfree(ptr);
165#endif
166}
167
168/* Update size with this section: return offset. */
169static long get_offset(unsigned long *size, Elf_Shdr *sechdr)
170{
171 long ret;
172
173 ret = ALIGN(*size, sechdr->sh_addralign ? : 1);
174 *size = ret + sechdr->sh_size;
175 return ret;
176}
177
178/* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
179 might -- code, read-only data, read-write data, small data. Tally
180 sizes, and place the offsets into sh_entsize fields: high bit means it
181 belongs in init. */
182static void layout_sections(struct module *mod, const Elf_Ehdr *hdr,
183 Elf_Shdr *sechdrs, const char *secstrings)
184{
185 static unsigned long const masks[][2] = {
186 /* NOTE: all executable code must be the first section
187 * in this array; otherwise modify the text_size
188 * finder in the two loops below */
189 {SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL},
190 {SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL},
191 {SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL},
192 {ARCH_SHF_SMALL | SHF_ALLOC, 0}
193 };
194 unsigned int m, i;
195
196 for (i = 0; i < hdr->e_shnum; i++)
197 sechdrs[i].sh_entsize = ~0UL;
198
199 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
200 for (i = 0; i < hdr->e_shnum; ++i) {
201 Elf_Shdr *s = &sechdrs[i];
202
203 if ((s->sh_flags & masks[m][0]) != masks[m][0]
204 || (s->sh_flags & masks[m][1])
205 || s->sh_entsize != ~0UL)
206 continue;
207 s->sh_entsize =
208 get_offset((unsigned long *)&mod->core_layout.size, s);
209 }
210
211 if (m == 0)
212 mod->core_layout.text_size = mod->core_layout.size;
213
214 }
215}
216
217/* from module-elf32.c, but subverted a little */
218
219struct mips_hi16 {
220 struct mips_hi16 *next;
221 Elf32_Addr *addr;
222 Elf32_Addr value;
223};
224
225static struct mips_hi16 *mips_hi16_list;
226static unsigned int gp_offs, gp_addr;
227
228static int apply_r_mips_none(struct module *me, uint32_t *location,
229 Elf32_Addr v)
230{
231 return 0;
232}
233
234static int apply_r_mips_gprel16(struct module *me, uint32_t *location,
235 Elf32_Addr v)
236{
237 int rel;
238
239 if (!(*location & 0xffff)) {
240 rel = (int)v - gp_addr;
241 } else {
242 /* .sbss + gp(relative) + offset */
243 /* kludge! */
244 rel = (int)(short)((int)v + gp_offs +
245 (int)(short)(*location & 0xffff) - gp_addr);
246 }
247
248 if ((rel > 32768) || (rel < -32768)) {
249 pr_debug("VPE loader: apply_r_mips_gprel16: relative address 0x%x out of range of gp register\n",
250 rel);
251 return -ENOEXEC;
252 }
253
254 *location = (*location & 0xffff0000) | (rel & 0xffff);
255
256 return 0;
257}
258
259static int apply_r_mips_pc16(struct module *me, uint32_t *location,
260 Elf32_Addr v)
261{
262 int rel;
263 rel = (((unsigned int)v - (unsigned int)location));
264 rel >>= 2; /* because the offset is in _instructions_ not bytes. */
265 rel -= 1; /* and one instruction less due to the branch delay slot. */
266
267 if ((rel > 32768) || (rel < -32768)) {
268 pr_debug("VPE loader: apply_r_mips_pc16: relative address out of range 0x%x\n",
269 rel);
270 return -ENOEXEC;
271 }
272
273 *location = (*location & 0xffff0000) | (rel & 0xffff);
274
275 return 0;
276}
277
278static int apply_r_mips_32(struct module *me, uint32_t *location,
279 Elf32_Addr v)
280{
281 *location += v;
282
283 return 0;
284}
285
286static int apply_r_mips_26(struct module *me, uint32_t *location,
287 Elf32_Addr v)
288{
289 if (v % 4) {
290 pr_debug("VPE loader: apply_r_mips_26: unaligned relocation\n");
291 return -ENOEXEC;
292 }
293
294/*
295 * Not desperately convinced this is a good check of an overflow condition
296 * anyway. But it gets in the way of handling undefined weak symbols which
297 * we want to set to zero.
298 * if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
299 * printk(KERN_ERR
300 * "module %s: relocation overflow\n",
301 * me->name);
302 * return -ENOEXEC;
303 * }
304 */
305
306 *location = (*location & ~0x03ffffff) |
307 ((*location + (v >> 2)) & 0x03ffffff);
308 return 0;
309}
310
311static int apply_r_mips_hi16(struct module *me, uint32_t *location,
312 Elf32_Addr v)
313{
314 struct mips_hi16 *n;
315
316 /*
317 * We cannot relocate this one now because we don't know the value of
318 * the carry we need to add. Save the information, and let LO16 do the
319 * actual relocation.
320 */
321 n = kmalloc(sizeof(*n), GFP_KERNEL);
322 if (!n)
323 return -ENOMEM;
324
325 n->addr = location;
326 n->value = v;
327 n->next = mips_hi16_list;
328 mips_hi16_list = n;
329
330 return 0;
331}
332
333static int apply_r_mips_lo16(struct module *me, uint32_t *location,
334 Elf32_Addr v)
335{
336 unsigned long insnlo = *location;
337 Elf32_Addr val, vallo;
338 struct mips_hi16 *l, *next;
339
340 /* Sign extend the addend we extract from the lo insn. */
341 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
342
343 if (mips_hi16_list != NULL) {
344
345 l = mips_hi16_list;
346 while (l != NULL) {
347 unsigned long insn;
348
349 /*
350 * The value for the HI16 had best be the same.
351 */
352 if (v != l->value) {
353 pr_debug("VPE loader: apply_r_mips_lo16/hi16: inconsistent value information\n");
354 goto out_free;
355 }
356
357 /*
358 * Do the HI16 relocation. Note that we actually don't
359 * need to know anything about the LO16 itself, except
360 * where to find the low 16 bits of the addend needed
361 * by the LO16.
362 */
363 insn = *l->addr;
364 val = ((insn & 0xffff) << 16) + vallo;
365 val += v;
366
367 /*
368 * Account for the sign extension that will happen in
369 * the low bits.
370 */
371 val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
372
373 insn = (insn & ~0xffff) | val;
374 *l->addr = insn;
375
376 next = l->next;
377 kfree(l);
378 l = next;
379 }
380
381 mips_hi16_list = NULL;
382 }
383
384 /*
385 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
386 */
387 val = v + vallo;
388 insnlo = (insnlo & ~0xffff) | (val & 0xffff);
389 *location = insnlo;
390
391 return 0;
392
393out_free:
394 while (l != NULL) {
395 next = l->next;
396 kfree(l);
397 l = next;
398 }
399 mips_hi16_list = NULL;
400
401 return -ENOEXEC;
402}
403
404static int (*reloc_handlers[]) (struct module *me, uint32_t *location,
405 Elf32_Addr v) = {
406 [R_MIPS_NONE] = apply_r_mips_none,
407 [R_MIPS_32] = apply_r_mips_32,
408 [R_MIPS_26] = apply_r_mips_26,
409 [R_MIPS_HI16] = apply_r_mips_hi16,
410 [R_MIPS_LO16] = apply_r_mips_lo16,
411 [R_MIPS_GPREL16] = apply_r_mips_gprel16,
412 [R_MIPS_PC16] = apply_r_mips_pc16
413};
414
415static char *rstrs[] = {
416 [R_MIPS_NONE] = "MIPS_NONE",
417 [R_MIPS_32] = "MIPS_32",
418 [R_MIPS_26] = "MIPS_26",
419 [R_MIPS_HI16] = "MIPS_HI16",
420 [R_MIPS_LO16] = "MIPS_LO16",
421 [R_MIPS_GPREL16] = "MIPS_GPREL16",
422 [R_MIPS_PC16] = "MIPS_PC16"
423};
424
425static int apply_relocations(Elf32_Shdr *sechdrs,
426 const char *strtab,
427 unsigned int symindex,
428 unsigned int relsec,
429 struct module *me)
430{
431 Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr;
432 Elf32_Sym *sym;
433 uint32_t *location;
434 unsigned int i;
435 Elf32_Addr v;
436 int res;
437
438 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
439 Elf32_Word r_info = rel[i].r_info;
440
441 /* This is where to make the change */
442 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
443 + rel[i].r_offset;
444 /* This is the symbol it is referring to */
445 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
446 + ELF32_R_SYM(r_info);
447
448 if (!sym->st_value) {
449 pr_debug("%s: undefined weak symbol %s\n",
450 me->name, strtab + sym->st_name);
451 /* just print the warning, dont barf */
452 }
453
454 v = sym->st_value;
455
456 res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v);
457 if (res) {
458 char *r = rstrs[ELF32_R_TYPE(r_info)];
459 pr_warn("VPE loader: .text+0x%x relocation type %s for symbol \"%s\" failed\n",
460 rel[i].r_offset, r ? r : "UNKNOWN",
461 strtab + sym->st_name);
462 return res;
463 }
464 }
465
466 return 0;
467}
468
469static inline void save_gp_address(unsigned int secbase, unsigned int rel)
470{
471 gp_addr = secbase + rel;
472 gp_offs = gp_addr - (secbase & 0xffff0000);
473}
474/* end module-elf32.c */
475
476/* Change all symbols so that sh_value encodes the pointer directly. */
477static void simplify_symbols(Elf_Shdr *sechdrs,
478 unsigned int symindex,
479 const char *strtab,
480 const char *secstrings,
481 unsigned int nsecs, struct module *mod)
482{
483 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
484 unsigned long secbase, bssbase = 0;
485 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
486 int size;
487
488 /* find the .bss section for COMMON symbols */
489 for (i = 0; i < nsecs; i++) {
490 if (strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) == 0) {
491 bssbase = sechdrs[i].sh_addr;
492 break;
493 }
494 }
495
496 for (i = 1; i < n; i++) {
497 switch (sym[i].st_shndx) {
498 case SHN_COMMON:
499 /* Allocate space for the symbol in the .bss section.
500 st_value is currently size.
501 We want it to have the address of the symbol. */
502
503 size = sym[i].st_value;
504 sym[i].st_value = bssbase;
505
506 bssbase += size;
507 break;
508
509 case SHN_ABS:
510 /* Don't need to do anything */
511 break;
512
513 case SHN_UNDEF:
514 /* ret = -ENOENT; */
515 break;
516
517 case SHN_MIPS_SCOMMON:
518 pr_debug("simplify_symbols: ignoring SHN_MIPS_SCOMMON symbol <%s> st_shndx %d\n",
519 strtab + sym[i].st_name, sym[i].st_shndx);
520 /* .sbss section */
521 break;
522
523 default:
524 secbase = sechdrs[sym[i].st_shndx].sh_addr;
525
526 if (strncmp(strtab + sym[i].st_name, "_gp", 3) == 0)
527 save_gp_address(secbase, sym[i].st_value);
528
529 sym[i].st_value += secbase;
530 break;
531 }
532 }
533}
534
535#ifdef DEBUG_ELFLOADER
536static void dump_elfsymbols(Elf_Shdr *sechdrs, unsigned int symindex,
537 const char *strtab, struct module *mod)
538{
539 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
540 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
541
542 pr_debug("dump_elfsymbols: n %d\n", n);
543 for (i = 1; i < n; i++) {
544 pr_debug(" i %d name <%s> 0x%x\n", i, strtab + sym[i].st_name,
545 sym[i].st_value);
546 }
547}
548#endif
549
550static int find_vpe_symbols(struct vpe *v, Elf_Shdr *sechdrs,
551 unsigned int symindex, const char *strtab,
552 struct module *mod)
553{
554 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
555 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
556
557 for (i = 1; i < n; i++) {
558 if (strcmp(strtab + sym[i].st_name, "__start") == 0)
559 v->__start = sym[i].st_value;
560
561 if (strcmp(strtab + sym[i].st_name, "vpe_shared") == 0)
562 v->shared_ptr = (void *)sym[i].st_value;
563 }
564
565 if ((v->__start == 0) || (v->shared_ptr == NULL))
566 return -1;
567
568 return 0;
569}
570
571/*
572 * Allocates a VPE with some program code space(the load address), copies the
573 * contents of the program (p)buffer performing relocatations/etc, free's it
574 * when finished.
575 */
576static int vpe_elfload(struct vpe *v)
577{
578 Elf_Ehdr *hdr;
579 Elf_Shdr *sechdrs;
580 long err = 0;
581 char *secstrings, *strtab = NULL;
582 unsigned int len, i, symindex = 0, strindex = 0, relocate = 0;
583 struct module mod; /* so we can re-use the relocations code */
584
585 memset(&mod, 0, sizeof(struct module));
586 strcpy(mod.name, "VPE loader");
587
588 hdr = (Elf_Ehdr *) v->pbuffer;
589 len = v->plen;
590
591 /* Sanity checks against insmoding binaries or wrong arch,
592 weird elf version */
593 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
594 || (hdr->e_type != ET_REL && hdr->e_type != ET_EXEC)
595 || !elf_check_arch(hdr)
596 || hdr->e_shentsize != sizeof(*sechdrs)) {
597 pr_warn("VPE loader: program wrong arch or weird elf version\n");
598
599 return -ENOEXEC;
600 }
601
602 if (hdr->e_type == ET_REL)
603 relocate = 1;
604
605 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) {
606 pr_err("VPE loader: program length %u truncated\n", len);
607
608 return -ENOEXEC;
609 }
610
611 /* Convenience variables */
612 sechdrs = (void *)hdr + hdr->e_shoff;
613 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
614 sechdrs[0].sh_addr = 0;
615
616 /* And these should exist, but gcc whinges if we don't init them */
617 symindex = strindex = 0;
618
619 if (relocate) {
620 for (i = 1; i < hdr->e_shnum; i++) {
621 if ((sechdrs[i].sh_type != SHT_NOBITS) &&
622 (len < sechdrs[i].sh_offset + sechdrs[i].sh_size)) {
623 pr_err("VPE program length %u truncated\n",
624 len);
625 return -ENOEXEC;
626 }
627
628 /* Mark all sections sh_addr with their address in the
629 temporary image. */
630 sechdrs[i].sh_addr = (size_t) hdr +
631 sechdrs[i].sh_offset;
632
633 /* Internal symbols and strings. */
634 if (sechdrs[i].sh_type == SHT_SYMTAB) {
635 symindex = i;
636 strindex = sechdrs[i].sh_link;
637 strtab = (char *)hdr +
638 sechdrs[strindex].sh_offset;
639 }
640 }
641 layout_sections(&mod, hdr, sechdrs, secstrings);
642 }
643
644 v->load_addr = alloc_progmem(mod.core_layout.size);
645 if (!v->load_addr)
646 return -ENOMEM;
647
648 pr_info("VPE loader: loading to %p\n", v->load_addr);
649
650 if (relocate) {
651 for (i = 0; i < hdr->e_shnum; i++) {
652 void *dest;
653
654 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
655 continue;
656
657 dest = v->load_addr + sechdrs[i].sh_entsize;
658
659 if (sechdrs[i].sh_type != SHT_NOBITS)
660 memcpy(dest, (void *)sechdrs[i].sh_addr,
661 sechdrs[i].sh_size);
662 /* Update sh_addr to point to copy in image. */
663 sechdrs[i].sh_addr = (unsigned long)dest;
664
665 pr_debug(" section sh_name %s sh_addr 0x%x\n",
666 secstrings + sechdrs[i].sh_name,
667 sechdrs[i].sh_addr);
668 }
669
670 /* Fix up syms, so that st_value is a pointer to location. */
671 simplify_symbols(sechdrs, symindex, strtab, secstrings,
672 hdr->e_shnum, &mod);
673
674 /* Now do relocations. */
675 for (i = 1; i < hdr->e_shnum; i++) {
676 const char *strtab = (char *)sechdrs[strindex].sh_addr;
677 unsigned int info = sechdrs[i].sh_info;
678
679 /* Not a valid relocation section? */
680 if (info >= hdr->e_shnum)
681 continue;
682
683 /* Don't bother with non-allocated sections */
684 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
685 continue;
686
687 if (sechdrs[i].sh_type == SHT_REL)
688 err = apply_relocations(sechdrs, strtab,
689 symindex, i, &mod);
690 else if (sechdrs[i].sh_type == SHT_RELA)
691 err = apply_relocate_add(sechdrs, strtab,
692 symindex, i, &mod);
693 if (err < 0)
694 return err;
695
696 }
697 } else {
698 struct elf_phdr *phdr = (struct elf_phdr *)
699 ((char *)hdr + hdr->e_phoff);
700
701 for (i = 0; i < hdr->e_phnum; i++) {
702 if (phdr->p_type == PT_LOAD) {
703 memcpy((void *)phdr->p_paddr,
704 (char *)hdr + phdr->p_offset,
705 phdr->p_filesz);
706 memset((void *)phdr->p_paddr + phdr->p_filesz,
707 0, phdr->p_memsz - phdr->p_filesz);
708 }
709 phdr++;
710 }
711
712 for (i = 0; i < hdr->e_shnum; i++) {
713 /* Internal symbols and strings. */
714 if (sechdrs[i].sh_type == SHT_SYMTAB) {
715 symindex = i;
716 strindex = sechdrs[i].sh_link;
717 strtab = (char *)hdr +
718 sechdrs[strindex].sh_offset;
719
720 /*
721 * mark symtab's address for when we try
722 * to find the magic symbols
723 */
724 sechdrs[i].sh_addr = (size_t) hdr +
725 sechdrs[i].sh_offset;
726 }
727 }
728 }
729
730 /* make sure it's physically written out */
731 flush_icache_range((unsigned long)v->load_addr,
732 (unsigned long)v->load_addr + v->len);
733
734 if ((find_vpe_symbols(v, sechdrs, symindex, strtab, &mod)) < 0) {
735 if (v->__start == 0) {
736 pr_warn("VPE loader: program does not contain a __start symbol\n");
737 return -ENOEXEC;
738 }
739
740 if (v->shared_ptr == NULL)
741 pr_warn("VPE loader: program does not contain vpe_shared symbol.\n"
742 " Unable to use AMVP (AP/SP) facilities.\n");
743 }
744
745 pr_info(" elf loaded\n");
746 return 0;
747}
748
749static int getcwd(char *buff, int size)
750{
751 mm_segment_t old_fs;
752 int ret;
753
754 old_fs = get_fs();
755 set_fs(KERNEL_DS);
756
757 ret = sys_getcwd(buff, size);
758
759 set_fs(old_fs);
760
761 return ret;
762}
763
764/* checks VPE is unused and gets ready to load program */
765static int vpe_open(struct inode *inode, struct file *filp)
766{
767 enum vpe_state state;
768 struct vpe_notifications *notifier;
769 struct vpe *v;
770 int ret;
771
772 if (VPE_MODULE_MINOR != iminor(inode)) {
773 /* assume only 1 device at the moment. */
774 pr_warn("VPE loader: only vpe1 is supported\n");
775
776 return -ENODEV;
777 }
778
779 v = get_vpe(aprp_cpu_index());
780 if (v == NULL) {
781 pr_warn("VPE loader: unable to get vpe\n");
782
783 return -ENODEV;
784 }
785
786 state = xchg(&v->state, VPE_STATE_INUSE);
787 if (state != VPE_STATE_UNUSED) {
788 pr_debug("VPE loader: tc in use dumping regs\n");
789
790 list_for_each_entry(notifier, &v->notify, list)
791 notifier->stop(aprp_cpu_index());
792
793 release_progmem(v->load_addr);
794 cleanup_tc(get_tc(aprp_cpu_index()));
795 }
796
797 /* this of-course trashes what was there before... */
798 v->pbuffer = vmalloc(P_SIZE);
799 if (!v->pbuffer) {
800 pr_warn("VPE loader: unable to allocate memory\n");
801 return -ENOMEM;
802 }
803 v->plen = P_SIZE;
804 v->load_addr = NULL;
805 v->len = 0;
806
807 v->cwd[0] = 0;
808 ret = getcwd(v->cwd, VPE_PATH_MAX);
809 if (ret < 0)
810 pr_warn("VPE loader: open, getcwd returned %d\n", ret);
811
812 v->shared_ptr = NULL;
813 v->__start = 0;
814
815 return 0;
816}
817
818static int vpe_release(struct inode *inode, struct file *filp)
819{
820#if defined(CONFIG_MIPS_VPE_LOADER_MT) || defined(CONFIG_MIPS_VPE_LOADER_CMP)
821 struct vpe *v;
822 Elf_Ehdr *hdr;
823 int ret = 0;
824
825 v = get_vpe(aprp_cpu_index());
826 if (v == NULL)
827 return -ENODEV;
828
829 hdr = (Elf_Ehdr *) v->pbuffer;
830 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) == 0) {
831 if (vpe_elfload(v) >= 0) {
832 vpe_run(v);
833 } else {
834 pr_warn("VPE loader: ELF load failed.\n");
835 ret = -ENOEXEC;
836 }
837 } else {
838 pr_warn("VPE loader: only elf files are supported\n");
839 ret = -ENOEXEC;
840 }
841
842 /* It's good to be able to run the SP and if it chokes have a look at
843 the /dev/rt?. But if we reset the pointer to the shared struct we
844 lose what has happened. So perhaps if garbage is sent to the vpe
845 device, use it as a trigger for the reset. Hopefully a nice
846 executable will be along shortly. */
847 if (ret < 0)
848 v->shared_ptr = NULL;
849
850 vfree(v->pbuffer);
851 v->plen = 0;
852
853 return ret;
854#else
855 pr_warn("VPE loader: ELF load failed.\n");
856 return -ENOEXEC;
857#endif
858}
859
860static ssize_t vpe_write(struct file *file, const char __user *buffer,
861 size_t count, loff_t *ppos)
862{
863 size_t ret = count;
864 struct vpe *v;
865
866 if (iminor(file_inode(file)) != VPE_MODULE_MINOR)
867 return -ENODEV;
868
869 v = get_vpe(aprp_cpu_index());
870
871 if (v == NULL)
872 return -ENODEV;
873
874 if ((count + v->len) > v->plen) {
875 pr_warn("VPE loader: elf size too big. Perhaps strip uneeded symbols\n");
876 return -ENOMEM;
877 }
878
879 count -= copy_from_user(v->pbuffer + v->len, buffer, count);
880 if (!count)
881 return -EFAULT;
882
883 v->len += count;
884 return ret;
885}
886
887const struct file_operations vpe_fops = {
888 .owner = THIS_MODULE,
889 .open = vpe_open,
890 .release = vpe_release,
891 .write = vpe_write,
892 .llseek = noop_llseek,
893};
894
895void *vpe_get_shared(int index)
896{
897 struct vpe *v = get_vpe(index);
898
899 if (v == NULL)
900 return NULL;
901
902 return v->shared_ptr;
903}
904EXPORT_SYMBOL(vpe_get_shared);
905
906int vpe_notify(int index, struct vpe_notifications *notify)
907{
908 struct vpe *v = get_vpe(index);
909
910 if (v == NULL)
911 return -1;
912
913 list_add(¬ify->list, &v->notify);
914 return 0;
915}
916EXPORT_SYMBOL(vpe_notify);
917
918char *vpe_getcwd(int index)
919{
920 struct vpe *v = get_vpe(index);
921
922 if (v == NULL)
923 return NULL;
924
925 return v->cwd;
926}
927EXPORT_SYMBOL(vpe_getcwd);
928
929module_init(vpe_module_init);
930module_exit(vpe_module_exit);
931MODULE_DESCRIPTION("MIPS VPE Loader");
932MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
933MODULE_LICENSE("GPL");
1/*
2 * Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved.
3 *
4 * This program is free software; you can distribute it and/or modify it
5 * under the terms of the GNU General Public License (Version 2) as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
16 */
17
18/*
19 * VPE support module
20 *
21 * Provides support for loading a MIPS SP program on VPE1.
22 * The SP environment is rather simple, no tlb's. It needs to be relocatable
23 * (or partially linked). You should initialise your stack in the startup
24 * code. This loader looks for the symbol __start and sets up
25 * execution to resume from there. The MIPS SDE kit contains suitable examples.
26 *
27 * To load and run, simply cat a SP 'program file' to /dev/vpe1.
28 * i.e cat spapp >/dev/vpe1.
29 */
30#include <linux/kernel.h>
31#include <linux/device.h>
32#include <linux/module.h>
33#include <linux/fs.h>
34#include <linux/init.h>
35#include <asm/uaccess.h>
36#include <linux/slab.h>
37#include <linux/list.h>
38#include <linux/vmalloc.h>
39#include <linux/elf.h>
40#include <linux/seq_file.h>
41#include <linux/syscalls.h>
42#include <linux/moduleloader.h>
43#include <linux/interrupt.h>
44#include <linux/poll.h>
45#include <linux/bootmem.h>
46#include <asm/mipsregs.h>
47#include <asm/mipsmtregs.h>
48#include <asm/cacheflush.h>
49#include <linux/atomic.h>
50#include <asm/cpu.h>
51#include <asm/mips_mt.h>
52#include <asm/processor.h>
53#include <asm/system.h>
54#include <asm/vpe.h>
55#include <asm/kspd.h>
56
57typedef void *vpe_handle;
58
59#ifndef ARCH_SHF_SMALL
60#define ARCH_SHF_SMALL 0
61#endif
62
63/* If this is set, the section belongs in the init part of the module */
64#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
65
66/*
67 * The number of TCs and VPEs physically available on the core
68 */
69static int hw_tcs, hw_vpes;
70static char module_name[] = "vpe";
71static int major;
72static const int minor = 1; /* fixed for now */
73
74#ifdef CONFIG_MIPS_APSP_KSPD
75static struct kspd_notifications kspd_events;
76static int kspd_events_reqd;
77#endif
78
79/* grab the likely amount of memory we will need. */
80#ifdef CONFIG_MIPS_VPE_LOADER_TOM
81#define P_SIZE (2 * 1024 * 1024)
82#else
83/* add an overhead to the max kmalloc size for non-striped symbols/etc */
84#define P_SIZE (256 * 1024)
85#endif
86
87extern unsigned long physical_memsize;
88
89#define MAX_VPES 16
90#define VPE_PATH_MAX 256
91
92enum vpe_state {
93 VPE_STATE_UNUSED = 0,
94 VPE_STATE_INUSE,
95 VPE_STATE_RUNNING
96};
97
98enum tc_state {
99 TC_STATE_UNUSED = 0,
100 TC_STATE_INUSE,
101 TC_STATE_RUNNING,
102 TC_STATE_DYNAMIC
103};
104
105struct vpe {
106 enum vpe_state state;
107
108 /* (device) minor associated with this vpe */
109 int minor;
110
111 /* elfloader stuff */
112 void *load_addr;
113 unsigned long len;
114 char *pbuffer;
115 unsigned long plen;
116 unsigned int uid, gid;
117 char cwd[VPE_PATH_MAX];
118
119 unsigned long __start;
120
121 /* tc's associated with this vpe */
122 struct list_head tc;
123
124 /* The list of vpe's */
125 struct list_head list;
126
127 /* shared symbol address */
128 void *shared_ptr;
129
130 /* the list of who wants to know when something major happens */
131 struct list_head notify;
132
133 unsigned int ntcs;
134};
135
136struct tc {
137 enum tc_state state;
138 int index;
139
140 struct vpe *pvpe; /* parent VPE */
141 struct list_head tc; /* The list of TC's with this VPE */
142 struct list_head list; /* The global list of tc's */
143};
144
145struct {
146 spinlock_t vpe_list_lock;
147 struct list_head vpe_list; /* Virtual processing elements */
148 spinlock_t tc_list_lock;
149 struct list_head tc_list; /* Thread contexts */
150} vpecontrol = {
151 .vpe_list_lock = __SPIN_LOCK_UNLOCKED(vpe_list_lock),
152 .vpe_list = LIST_HEAD_INIT(vpecontrol.vpe_list),
153 .tc_list_lock = __SPIN_LOCK_UNLOCKED(tc_list_lock),
154 .tc_list = LIST_HEAD_INIT(vpecontrol.tc_list)
155};
156
157static void release_progmem(void *ptr);
158
159/* get the vpe associated with this minor */
160static struct vpe *get_vpe(int minor)
161{
162 struct vpe *res, *v;
163
164 if (!cpu_has_mipsmt)
165 return NULL;
166
167 res = NULL;
168 spin_lock(&vpecontrol.vpe_list_lock);
169 list_for_each_entry(v, &vpecontrol.vpe_list, list) {
170 if (v->minor == minor) {
171 res = v;
172 break;
173 }
174 }
175 spin_unlock(&vpecontrol.vpe_list_lock);
176
177 return res;
178}
179
180/* get the vpe associated with this minor */
181static struct tc *get_tc(int index)
182{
183 struct tc *res, *t;
184
185 res = NULL;
186 spin_lock(&vpecontrol.tc_list_lock);
187 list_for_each_entry(t, &vpecontrol.tc_list, list) {
188 if (t->index == index) {
189 res = t;
190 break;
191 }
192 }
193 spin_unlock(&vpecontrol.tc_list_lock);
194
195 return res;
196}
197
198/* allocate a vpe and associate it with this minor (or index) */
199static struct vpe *alloc_vpe(int minor)
200{
201 struct vpe *v;
202
203 if ((v = kzalloc(sizeof(struct vpe), GFP_KERNEL)) == NULL)
204 return NULL;
205
206 INIT_LIST_HEAD(&v->tc);
207 spin_lock(&vpecontrol.vpe_list_lock);
208 list_add_tail(&v->list, &vpecontrol.vpe_list);
209 spin_unlock(&vpecontrol.vpe_list_lock);
210
211 INIT_LIST_HEAD(&v->notify);
212 v->minor = minor;
213
214 return v;
215}
216
217/* allocate a tc. At startup only tc0 is running, all other can be halted. */
218static struct tc *alloc_tc(int index)
219{
220 struct tc *tc;
221
222 if ((tc = kzalloc(sizeof(struct tc), GFP_KERNEL)) == NULL)
223 goto out;
224
225 INIT_LIST_HEAD(&tc->tc);
226 tc->index = index;
227
228 spin_lock(&vpecontrol.tc_list_lock);
229 list_add_tail(&tc->list, &vpecontrol.tc_list);
230 spin_unlock(&vpecontrol.tc_list_lock);
231
232out:
233 return tc;
234}
235
236/* clean up and free everything */
237static void release_vpe(struct vpe *v)
238{
239 list_del(&v->list);
240 if (v->load_addr)
241 release_progmem(v);
242 kfree(v);
243}
244
245static void __maybe_unused dump_mtregs(void)
246{
247 unsigned long val;
248
249 val = read_c0_config3();
250 printk("config3 0x%lx MT %ld\n", val,
251 (val & CONFIG3_MT) >> CONFIG3_MT_SHIFT);
252
253 val = read_c0_mvpcontrol();
254 printk("MVPControl 0x%lx, STLB %ld VPC %ld EVP %ld\n", val,
255 (val & MVPCONTROL_STLB) >> MVPCONTROL_STLB_SHIFT,
256 (val & MVPCONTROL_VPC) >> MVPCONTROL_VPC_SHIFT,
257 (val & MVPCONTROL_EVP));
258
259 val = read_c0_mvpconf0();
260 printk("mvpconf0 0x%lx, PVPE %ld PTC %ld M %ld\n", val,
261 (val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT,
262 val & MVPCONF0_PTC, (val & MVPCONF0_M) >> MVPCONF0_M_SHIFT);
263}
264
265/* Find some VPE program space */
266static void *alloc_progmem(unsigned long len)
267{
268 void *addr;
269
270#ifdef CONFIG_MIPS_VPE_LOADER_TOM
271 /*
272 * This means you must tell Linux to use less memory than you
273 * physically have, for example by passing a mem= boot argument.
274 */
275 addr = pfn_to_kaddr(max_low_pfn);
276 memset(addr, 0, len);
277#else
278 /* simple grab some mem for now */
279 addr = kzalloc(len, GFP_KERNEL);
280#endif
281
282 return addr;
283}
284
285static void release_progmem(void *ptr)
286{
287#ifndef CONFIG_MIPS_VPE_LOADER_TOM
288 kfree(ptr);
289#endif
290}
291
292/* Update size with this section: return offset. */
293static long get_offset(unsigned long *size, Elf_Shdr * sechdr)
294{
295 long ret;
296
297 ret = ALIGN(*size, sechdr->sh_addralign ? : 1);
298 *size = ret + sechdr->sh_size;
299 return ret;
300}
301
302/* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
303 might -- code, read-only data, read-write data, small data. Tally
304 sizes, and place the offsets into sh_entsize fields: high bit means it
305 belongs in init. */
306static void layout_sections(struct module *mod, const Elf_Ehdr * hdr,
307 Elf_Shdr * sechdrs, const char *secstrings)
308{
309 static unsigned long const masks[][2] = {
310 /* NOTE: all executable code must be the first section
311 * in this array; otherwise modify the text_size
312 * finder in the two loops below */
313 {SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL},
314 {SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL},
315 {SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL},
316 {ARCH_SHF_SMALL | SHF_ALLOC, 0}
317 };
318 unsigned int m, i;
319
320 for (i = 0; i < hdr->e_shnum; i++)
321 sechdrs[i].sh_entsize = ~0UL;
322
323 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
324 for (i = 0; i < hdr->e_shnum; ++i) {
325 Elf_Shdr *s = &sechdrs[i];
326
327 // || strncmp(secstrings + s->sh_name, ".init", 5) == 0)
328 if ((s->sh_flags & masks[m][0]) != masks[m][0]
329 || (s->sh_flags & masks[m][1])
330 || s->sh_entsize != ~0UL)
331 continue;
332 s->sh_entsize =
333 get_offset((unsigned long *)&mod->core_size, s);
334 }
335
336 if (m == 0)
337 mod->core_text_size = mod->core_size;
338
339 }
340}
341
342
343/* from module-elf32.c, but subverted a little */
344
345struct mips_hi16 {
346 struct mips_hi16 *next;
347 Elf32_Addr *addr;
348 Elf32_Addr value;
349};
350
351static struct mips_hi16 *mips_hi16_list;
352static unsigned int gp_offs, gp_addr;
353
354static int apply_r_mips_none(struct module *me, uint32_t *location,
355 Elf32_Addr v)
356{
357 return 0;
358}
359
360static int apply_r_mips_gprel16(struct module *me, uint32_t *location,
361 Elf32_Addr v)
362{
363 int rel;
364
365 if( !(*location & 0xffff) ) {
366 rel = (int)v - gp_addr;
367 }
368 else {
369 /* .sbss + gp(relative) + offset */
370 /* kludge! */
371 rel = (int)(short)((int)v + gp_offs +
372 (int)(short)(*location & 0xffff) - gp_addr);
373 }
374
375 if( (rel > 32768) || (rel < -32768) ) {
376 printk(KERN_DEBUG "VPE loader: apply_r_mips_gprel16: "
377 "relative address 0x%x out of range of gp register\n",
378 rel);
379 return -ENOEXEC;
380 }
381
382 *location = (*location & 0xffff0000) | (rel & 0xffff);
383
384 return 0;
385}
386
387static int apply_r_mips_pc16(struct module *me, uint32_t *location,
388 Elf32_Addr v)
389{
390 int rel;
391 rel = (((unsigned int)v - (unsigned int)location));
392 rel >>= 2; // because the offset is in _instructions_ not bytes.
393 rel -= 1; // and one instruction less due to the branch delay slot.
394
395 if( (rel > 32768) || (rel < -32768) ) {
396 printk(KERN_DEBUG "VPE loader: "
397 "apply_r_mips_pc16: relative address out of range 0x%x\n", rel);
398 return -ENOEXEC;
399 }
400
401 *location = (*location & 0xffff0000) | (rel & 0xffff);
402
403 return 0;
404}
405
406static int apply_r_mips_32(struct module *me, uint32_t *location,
407 Elf32_Addr v)
408{
409 *location += v;
410
411 return 0;
412}
413
414static int apply_r_mips_26(struct module *me, uint32_t *location,
415 Elf32_Addr v)
416{
417 if (v % 4) {
418 printk(KERN_DEBUG "VPE loader: apply_r_mips_26 "
419 " unaligned relocation\n");
420 return -ENOEXEC;
421 }
422
423/*
424 * Not desperately convinced this is a good check of an overflow condition
425 * anyway. But it gets in the way of handling undefined weak symbols which
426 * we want to set to zero.
427 * if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
428 * printk(KERN_ERR
429 * "module %s: relocation overflow\n",
430 * me->name);
431 * return -ENOEXEC;
432 * }
433 */
434
435 *location = (*location & ~0x03ffffff) |
436 ((*location + (v >> 2)) & 0x03ffffff);
437 return 0;
438}
439
440static int apply_r_mips_hi16(struct module *me, uint32_t *location,
441 Elf32_Addr v)
442{
443 struct mips_hi16 *n;
444
445 /*
446 * We cannot relocate this one now because we don't know the value of
447 * the carry we need to add. Save the information, and let LO16 do the
448 * actual relocation.
449 */
450 n = kmalloc(sizeof *n, GFP_KERNEL);
451 if (!n)
452 return -ENOMEM;
453
454 n->addr = location;
455 n->value = v;
456 n->next = mips_hi16_list;
457 mips_hi16_list = n;
458
459 return 0;
460}
461
462static int apply_r_mips_lo16(struct module *me, uint32_t *location,
463 Elf32_Addr v)
464{
465 unsigned long insnlo = *location;
466 Elf32_Addr val, vallo;
467 struct mips_hi16 *l, *next;
468
469 /* Sign extend the addend we extract from the lo insn. */
470 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
471
472 if (mips_hi16_list != NULL) {
473
474 l = mips_hi16_list;
475 while (l != NULL) {
476 unsigned long insn;
477
478 /*
479 * The value for the HI16 had best be the same.
480 */
481 if (v != l->value) {
482 printk(KERN_DEBUG "VPE loader: "
483 "apply_r_mips_lo16/hi16: \t"
484 "inconsistent value information\n");
485 goto out_free;
486 }
487
488 /*
489 * Do the HI16 relocation. Note that we actually don't
490 * need to know anything about the LO16 itself, except
491 * where to find the low 16 bits of the addend needed
492 * by the LO16.
493 */
494 insn = *l->addr;
495 val = ((insn & 0xffff) << 16) + vallo;
496 val += v;
497
498 /*
499 * Account for the sign extension that will happen in
500 * the low bits.
501 */
502 val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
503
504 insn = (insn & ~0xffff) | val;
505 *l->addr = insn;
506
507 next = l->next;
508 kfree(l);
509 l = next;
510 }
511
512 mips_hi16_list = NULL;
513 }
514
515 /*
516 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
517 */
518 val = v + vallo;
519 insnlo = (insnlo & ~0xffff) | (val & 0xffff);
520 *location = insnlo;
521
522 return 0;
523
524out_free:
525 while (l != NULL) {
526 next = l->next;
527 kfree(l);
528 l = next;
529 }
530 mips_hi16_list = NULL;
531
532 return -ENOEXEC;
533}
534
535static int (*reloc_handlers[]) (struct module *me, uint32_t *location,
536 Elf32_Addr v) = {
537 [R_MIPS_NONE] = apply_r_mips_none,
538 [R_MIPS_32] = apply_r_mips_32,
539 [R_MIPS_26] = apply_r_mips_26,
540 [R_MIPS_HI16] = apply_r_mips_hi16,
541 [R_MIPS_LO16] = apply_r_mips_lo16,
542 [R_MIPS_GPREL16] = apply_r_mips_gprel16,
543 [R_MIPS_PC16] = apply_r_mips_pc16
544};
545
546static char *rstrs[] = {
547 [R_MIPS_NONE] = "MIPS_NONE",
548 [R_MIPS_32] = "MIPS_32",
549 [R_MIPS_26] = "MIPS_26",
550 [R_MIPS_HI16] = "MIPS_HI16",
551 [R_MIPS_LO16] = "MIPS_LO16",
552 [R_MIPS_GPREL16] = "MIPS_GPREL16",
553 [R_MIPS_PC16] = "MIPS_PC16"
554};
555
556static int apply_relocations(Elf32_Shdr *sechdrs,
557 const char *strtab,
558 unsigned int symindex,
559 unsigned int relsec,
560 struct module *me)
561{
562 Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr;
563 Elf32_Sym *sym;
564 uint32_t *location;
565 unsigned int i;
566 Elf32_Addr v;
567 int res;
568
569 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
570 Elf32_Word r_info = rel[i].r_info;
571
572 /* This is where to make the change */
573 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
574 + rel[i].r_offset;
575 /* This is the symbol it is referring to */
576 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
577 + ELF32_R_SYM(r_info);
578
579 if (!sym->st_value) {
580 printk(KERN_DEBUG "%s: undefined weak symbol %s\n",
581 me->name, strtab + sym->st_name);
582 /* just print the warning, dont barf */
583 }
584
585 v = sym->st_value;
586
587 res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v);
588 if( res ) {
589 char *r = rstrs[ELF32_R_TYPE(r_info)];
590 printk(KERN_WARNING "VPE loader: .text+0x%x "
591 "relocation type %s for symbol \"%s\" failed\n",
592 rel[i].r_offset, r ? r : "UNKNOWN",
593 strtab + sym->st_name);
594 return res;
595 }
596 }
597
598 return 0;
599}
600
601static inline void save_gp_address(unsigned int secbase, unsigned int rel)
602{
603 gp_addr = secbase + rel;
604 gp_offs = gp_addr - (secbase & 0xffff0000);
605}
606/* end module-elf32.c */
607
608
609
610/* Change all symbols so that sh_value encodes the pointer directly. */
611static void simplify_symbols(Elf_Shdr * sechdrs,
612 unsigned int symindex,
613 const char *strtab,
614 const char *secstrings,
615 unsigned int nsecs, struct module *mod)
616{
617 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
618 unsigned long secbase, bssbase = 0;
619 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
620 int size;
621
622 /* find the .bss section for COMMON symbols */
623 for (i = 0; i < nsecs; i++) {
624 if (strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) == 0) {
625 bssbase = sechdrs[i].sh_addr;
626 break;
627 }
628 }
629
630 for (i = 1; i < n; i++) {
631 switch (sym[i].st_shndx) {
632 case SHN_COMMON:
633 /* Allocate space for the symbol in the .bss section.
634 st_value is currently size.
635 We want it to have the address of the symbol. */
636
637 size = sym[i].st_value;
638 sym[i].st_value = bssbase;
639
640 bssbase += size;
641 break;
642
643 case SHN_ABS:
644 /* Don't need to do anything */
645 break;
646
647 case SHN_UNDEF:
648 /* ret = -ENOENT; */
649 break;
650
651 case SHN_MIPS_SCOMMON:
652 printk(KERN_DEBUG "simplify_symbols: ignoring SHN_MIPS_SCOMMON "
653 "symbol <%s> st_shndx %d\n", strtab + sym[i].st_name,
654 sym[i].st_shndx);
655 // .sbss section
656 break;
657
658 default:
659 secbase = sechdrs[sym[i].st_shndx].sh_addr;
660
661 if (strncmp(strtab + sym[i].st_name, "_gp", 3) == 0) {
662 save_gp_address(secbase, sym[i].st_value);
663 }
664
665 sym[i].st_value += secbase;
666 break;
667 }
668 }
669}
670
671#ifdef DEBUG_ELFLOADER
672static void dump_elfsymbols(Elf_Shdr * sechdrs, unsigned int symindex,
673 const char *strtab, struct module *mod)
674{
675 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
676 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
677
678 printk(KERN_DEBUG "dump_elfsymbols: n %d\n", n);
679 for (i = 1; i < n; i++) {
680 printk(KERN_DEBUG " i %d name <%s> 0x%x\n", i,
681 strtab + sym[i].st_name, sym[i].st_value);
682 }
683}
684#endif
685
686/* We are prepared so configure and start the VPE... */
687static int vpe_run(struct vpe * v)
688{
689 unsigned long flags, val, dmt_flag;
690 struct vpe_notifications *n;
691 unsigned int vpeflags;
692 struct tc *t;
693
694 /* check we are the Master VPE */
695 local_irq_save(flags);
696 val = read_c0_vpeconf0();
697 if (!(val & VPECONF0_MVP)) {
698 printk(KERN_WARNING
699 "VPE loader: only Master VPE's are allowed to configure MT\n");
700 local_irq_restore(flags);
701
702 return -1;
703 }
704
705 dmt_flag = dmt();
706 vpeflags = dvpe();
707
708 if (!list_empty(&v->tc)) {
709 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
710 evpe(vpeflags);
711 emt(dmt_flag);
712 local_irq_restore(flags);
713
714 printk(KERN_WARNING
715 "VPE loader: TC %d is already in use.\n",
716 t->index);
717 return -ENOEXEC;
718 }
719 } else {
720 evpe(vpeflags);
721 emt(dmt_flag);
722 local_irq_restore(flags);
723
724 printk(KERN_WARNING
725 "VPE loader: No TC's associated with VPE %d\n",
726 v->minor);
727
728 return -ENOEXEC;
729 }
730
731 /* Put MVPE's into 'configuration state' */
732 set_c0_mvpcontrol(MVPCONTROL_VPC);
733
734 settc(t->index);
735
736 /* should check it is halted, and not activated */
737 if ((read_tc_c0_tcstatus() & TCSTATUS_A) || !(read_tc_c0_tchalt() & TCHALT_H)) {
738 evpe(vpeflags);
739 emt(dmt_flag);
740 local_irq_restore(flags);
741
742 printk(KERN_WARNING "VPE loader: TC %d is already active!\n",
743 t->index);
744
745 return -ENOEXEC;
746 }
747
748 /* Write the address we want it to start running from in the TCPC register. */
749 write_tc_c0_tcrestart((unsigned long)v->__start);
750 write_tc_c0_tccontext((unsigned long)0);
751
752 /*
753 * Mark the TC as activated, not interrupt exempt and not dynamically
754 * allocatable
755 */
756 val = read_tc_c0_tcstatus();
757 val = (val & ~(TCSTATUS_DA | TCSTATUS_IXMT)) | TCSTATUS_A;
758 write_tc_c0_tcstatus(val);
759
760 write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H);
761
762 /*
763 * The sde-kit passes 'memsize' to __start in $a3, so set something
764 * here... Or set $a3 to zero and define DFLT_STACK_SIZE and
765 * DFLT_HEAP_SIZE when you compile your program
766 */
767 mttgpr(6, v->ntcs);
768 mttgpr(7, physical_memsize);
769
770 /* set up VPE1 */
771 /*
772 * bind the TC to VPE 1 as late as possible so we only have the final
773 * VPE registers to set up, and so an EJTAG probe can trigger on it
774 */
775 write_tc_c0_tcbind((read_tc_c0_tcbind() & ~TCBIND_CURVPE) | 1);
776
777 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~(VPECONF0_VPA));
778
779 back_to_back_c0_hazard();
780
781 /* Set up the XTC bit in vpeconf0 to point at our tc */
782 write_vpe_c0_vpeconf0( (read_vpe_c0_vpeconf0() & ~(VPECONF0_XTC))
783 | (t->index << VPECONF0_XTC_SHIFT));
784
785 back_to_back_c0_hazard();
786
787 /* enable this VPE */
788 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
789
790 /* clear out any left overs from a previous program */
791 write_vpe_c0_status(0);
792 write_vpe_c0_cause(0);
793
794 /* take system out of configuration state */
795 clear_c0_mvpcontrol(MVPCONTROL_VPC);
796
797 /*
798 * SMTC/SMVP kernels manage VPE enable independently,
799 * but uniprocessor kernels need to turn it on, even
800 * if that wasn't the pre-dvpe() state.
801 */
802#ifdef CONFIG_SMP
803 evpe(vpeflags);
804#else
805 evpe(EVPE_ENABLE);
806#endif
807 emt(dmt_flag);
808 local_irq_restore(flags);
809
810 list_for_each_entry(n, &v->notify, list)
811 n->start(minor);
812
813 return 0;
814}
815
816static int find_vpe_symbols(struct vpe * v, Elf_Shdr * sechdrs,
817 unsigned int symindex, const char *strtab,
818 struct module *mod)
819{
820 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
821 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
822
823 for (i = 1; i < n; i++) {
824 if (strcmp(strtab + sym[i].st_name, "__start") == 0) {
825 v->__start = sym[i].st_value;
826 }
827
828 if (strcmp(strtab + sym[i].st_name, "vpe_shared") == 0) {
829 v->shared_ptr = (void *)sym[i].st_value;
830 }
831 }
832
833 if ( (v->__start == 0) || (v->shared_ptr == NULL))
834 return -1;
835
836 return 0;
837}
838
839/*
840 * Allocates a VPE with some program code space(the load address), copies the
841 * contents of the program (p)buffer performing relocatations/etc, free's it
842 * when finished.
843 */
844static int vpe_elfload(struct vpe * v)
845{
846 Elf_Ehdr *hdr;
847 Elf_Shdr *sechdrs;
848 long err = 0;
849 char *secstrings, *strtab = NULL;
850 unsigned int len, i, symindex = 0, strindex = 0, relocate = 0;
851 struct module mod; // so we can re-use the relocations code
852
853 memset(&mod, 0, sizeof(struct module));
854 strcpy(mod.name, "VPE loader");
855
856 hdr = (Elf_Ehdr *) v->pbuffer;
857 len = v->plen;
858
859 /* Sanity checks against insmoding binaries or wrong arch,
860 weird elf version */
861 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
862 || (hdr->e_type != ET_REL && hdr->e_type != ET_EXEC)
863 || !elf_check_arch(hdr)
864 || hdr->e_shentsize != sizeof(*sechdrs)) {
865 printk(KERN_WARNING
866 "VPE loader: program wrong arch or weird elf version\n");
867
868 return -ENOEXEC;
869 }
870
871 if (hdr->e_type == ET_REL)
872 relocate = 1;
873
874 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) {
875 printk(KERN_ERR "VPE loader: program length %u truncated\n",
876 len);
877
878 return -ENOEXEC;
879 }
880
881 /* Convenience variables */
882 sechdrs = (void *)hdr + hdr->e_shoff;
883 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
884 sechdrs[0].sh_addr = 0;
885
886 /* And these should exist, but gcc whinges if we don't init them */
887 symindex = strindex = 0;
888
889 if (relocate) {
890 for (i = 1; i < hdr->e_shnum; i++) {
891 if (sechdrs[i].sh_type != SHT_NOBITS
892 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) {
893 printk(KERN_ERR "VPE program length %u truncated\n",
894 len);
895 return -ENOEXEC;
896 }
897
898 /* Mark all sections sh_addr with their address in the
899 temporary image. */
900 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
901
902 /* Internal symbols and strings. */
903 if (sechdrs[i].sh_type == SHT_SYMTAB) {
904 symindex = i;
905 strindex = sechdrs[i].sh_link;
906 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
907 }
908 }
909 layout_sections(&mod, hdr, sechdrs, secstrings);
910 }
911
912 v->load_addr = alloc_progmem(mod.core_size);
913 if (!v->load_addr)
914 return -ENOMEM;
915
916 pr_info("VPE loader: loading to %p\n", v->load_addr);
917
918 if (relocate) {
919 for (i = 0; i < hdr->e_shnum; i++) {
920 void *dest;
921
922 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
923 continue;
924
925 dest = v->load_addr + sechdrs[i].sh_entsize;
926
927 if (sechdrs[i].sh_type != SHT_NOBITS)
928 memcpy(dest, (void *)sechdrs[i].sh_addr,
929 sechdrs[i].sh_size);
930 /* Update sh_addr to point to copy in image. */
931 sechdrs[i].sh_addr = (unsigned long)dest;
932
933 printk(KERN_DEBUG " section sh_name %s sh_addr 0x%x\n",
934 secstrings + sechdrs[i].sh_name, sechdrs[i].sh_addr);
935 }
936
937 /* Fix up syms, so that st_value is a pointer to location. */
938 simplify_symbols(sechdrs, symindex, strtab, secstrings,
939 hdr->e_shnum, &mod);
940
941 /* Now do relocations. */
942 for (i = 1; i < hdr->e_shnum; i++) {
943 const char *strtab = (char *)sechdrs[strindex].sh_addr;
944 unsigned int info = sechdrs[i].sh_info;
945
946 /* Not a valid relocation section? */
947 if (info >= hdr->e_shnum)
948 continue;
949
950 /* Don't bother with non-allocated sections */
951 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
952 continue;
953
954 if (sechdrs[i].sh_type == SHT_REL)
955 err = apply_relocations(sechdrs, strtab, symindex, i,
956 &mod);
957 else if (sechdrs[i].sh_type == SHT_RELA)
958 err = apply_relocate_add(sechdrs, strtab, symindex, i,
959 &mod);
960 if (err < 0)
961 return err;
962
963 }
964 } else {
965 struct elf_phdr *phdr = (struct elf_phdr *) ((char *)hdr + hdr->e_phoff);
966
967 for (i = 0; i < hdr->e_phnum; i++) {
968 if (phdr->p_type == PT_LOAD) {
969 memcpy((void *)phdr->p_paddr,
970 (char *)hdr + phdr->p_offset,
971 phdr->p_filesz);
972 memset((void *)phdr->p_paddr + phdr->p_filesz,
973 0, phdr->p_memsz - phdr->p_filesz);
974 }
975 phdr++;
976 }
977
978 for (i = 0; i < hdr->e_shnum; i++) {
979 /* Internal symbols and strings. */
980 if (sechdrs[i].sh_type == SHT_SYMTAB) {
981 symindex = i;
982 strindex = sechdrs[i].sh_link;
983 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
984
985 /* mark the symtab's address for when we try to find the
986 magic symbols */
987 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
988 }
989 }
990 }
991
992 /* make sure it's physically written out */
993 flush_icache_range((unsigned long)v->load_addr,
994 (unsigned long)v->load_addr + v->len);
995
996 if ((find_vpe_symbols(v, sechdrs, symindex, strtab, &mod)) < 0) {
997 if (v->__start == 0) {
998 printk(KERN_WARNING "VPE loader: program does not contain "
999 "a __start symbol\n");
1000 return -ENOEXEC;
1001 }
1002
1003 if (v->shared_ptr == NULL)
1004 printk(KERN_WARNING "VPE loader: "
1005 "program does not contain vpe_shared symbol.\n"
1006 " Unable to use AMVP (AP/SP) facilities.\n");
1007 }
1008
1009 printk(" elf loaded\n");
1010 return 0;
1011}
1012
1013static void cleanup_tc(struct tc *tc)
1014{
1015 unsigned long flags;
1016 unsigned int mtflags, vpflags;
1017 int tmp;
1018
1019 local_irq_save(flags);
1020 mtflags = dmt();
1021 vpflags = dvpe();
1022 /* Put MVPE's into 'configuration state' */
1023 set_c0_mvpcontrol(MVPCONTROL_VPC);
1024
1025 settc(tc->index);
1026 tmp = read_tc_c0_tcstatus();
1027
1028 /* mark not allocated and not dynamically allocatable */
1029 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1030 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1031 write_tc_c0_tcstatus(tmp);
1032
1033 write_tc_c0_tchalt(TCHALT_H);
1034 mips_ihb();
1035
1036 /* bind it to anything other than VPE1 */
1037// write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE); // | TCBIND_CURVPE
1038
1039 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1040 evpe(vpflags);
1041 emt(mtflags);
1042 local_irq_restore(flags);
1043}
1044
1045static int getcwd(char *buff, int size)
1046{
1047 mm_segment_t old_fs;
1048 int ret;
1049
1050 old_fs = get_fs();
1051 set_fs(KERNEL_DS);
1052
1053 ret = sys_getcwd(buff, size);
1054
1055 set_fs(old_fs);
1056
1057 return ret;
1058}
1059
1060/* checks VPE is unused and gets ready to load program */
1061static int vpe_open(struct inode *inode, struct file *filp)
1062{
1063 enum vpe_state state;
1064 struct vpe_notifications *not;
1065 struct vpe *v;
1066 int ret;
1067
1068 if (minor != iminor(inode)) {
1069 /* assume only 1 device at the moment. */
1070 pr_warning("VPE loader: only vpe1 is supported\n");
1071
1072 return -ENODEV;
1073 }
1074
1075 if ((v = get_vpe(tclimit)) == NULL) {
1076 pr_warning("VPE loader: unable to get vpe\n");
1077
1078 return -ENODEV;
1079 }
1080
1081 state = xchg(&v->state, VPE_STATE_INUSE);
1082 if (state != VPE_STATE_UNUSED) {
1083 printk(KERN_DEBUG "VPE loader: tc in use dumping regs\n");
1084
1085 list_for_each_entry(not, &v->notify, list) {
1086 not->stop(tclimit);
1087 }
1088
1089 release_progmem(v->load_addr);
1090 cleanup_tc(get_tc(tclimit));
1091 }
1092
1093 /* this of-course trashes what was there before... */
1094 v->pbuffer = vmalloc(P_SIZE);
1095 if (!v->pbuffer) {
1096 pr_warning("VPE loader: unable to allocate memory\n");
1097 return -ENOMEM;
1098 }
1099 v->plen = P_SIZE;
1100 v->load_addr = NULL;
1101 v->len = 0;
1102
1103 v->uid = filp->f_cred->fsuid;
1104 v->gid = filp->f_cred->fsgid;
1105
1106#ifdef CONFIG_MIPS_APSP_KSPD
1107 /* get kspd to tell us when a syscall_exit happens */
1108 if (!kspd_events_reqd) {
1109 kspd_notify(&kspd_events);
1110 kspd_events_reqd++;
1111 }
1112#endif
1113
1114 v->cwd[0] = 0;
1115 ret = getcwd(v->cwd, VPE_PATH_MAX);
1116 if (ret < 0)
1117 printk(KERN_WARNING "VPE loader: open, getcwd returned %d\n", ret);
1118
1119 v->shared_ptr = NULL;
1120 v->__start = 0;
1121
1122 return 0;
1123}
1124
1125static int vpe_release(struct inode *inode, struct file *filp)
1126{
1127 struct vpe *v;
1128 Elf_Ehdr *hdr;
1129 int ret = 0;
1130
1131 v = get_vpe(tclimit);
1132 if (v == NULL)
1133 return -ENODEV;
1134
1135 hdr = (Elf_Ehdr *) v->pbuffer;
1136 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) == 0) {
1137 if (vpe_elfload(v) >= 0) {
1138 vpe_run(v);
1139 } else {
1140 printk(KERN_WARNING "VPE loader: ELF load failed.\n");
1141 ret = -ENOEXEC;
1142 }
1143 } else {
1144 printk(KERN_WARNING "VPE loader: only elf files are supported\n");
1145 ret = -ENOEXEC;
1146 }
1147
1148 /* It's good to be able to run the SP and if it chokes have a look at
1149 the /dev/rt?. But if we reset the pointer to the shared struct we
1150 lose what has happened. So perhaps if garbage is sent to the vpe
1151 device, use it as a trigger for the reset. Hopefully a nice
1152 executable will be along shortly. */
1153 if (ret < 0)
1154 v->shared_ptr = NULL;
1155
1156 vfree(v->pbuffer);
1157 v->plen = 0;
1158
1159 return ret;
1160}
1161
1162static ssize_t vpe_write(struct file *file, const char __user * buffer,
1163 size_t count, loff_t * ppos)
1164{
1165 size_t ret = count;
1166 struct vpe *v;
1167
1168 if (iminor(file->f_path.dentry->d_inode) != minor)
1169 return -ENODEV;
1170
1171 v = get_vpe(tclimit);
1172 if (v == NULL)
1173 return -ENODEV;
1174
1175 if ((count + v->len) > v->plen) {
1176 printk(KERN_WARNING
1177 "VPE loader: elf size too big. Perhaps strip uneeded symbols\n");
1178 return -ENOMEM;
1179 }
1180
1181 count -= copy_from_user(v->pbuffer + v->len, buffer, count);
1182 if (!count)
1183 return -EFAULT;
1184
1185 v->len += count;
1186 return ret;
1187}
1188
1189static const struct file_operations vpe_fops = {
1190 .owner = THIS_MODULE,
1191 .open = vpe_open,
1192 .release = vpe_release,
1193 .write = vpe_write,
1194 .llseek = noop_llseek,
1195};
1196
1197/* module wrapper entry points */
1198/* give me a vpe */
1199vpe_handle vpe_alloc(void)
1200{
1201 int i;
1202 struct vpe *v;
1203
1204 /* find a vpe */
1205 for (i = 1; i < MAX_VPES; i++) {
1206 if ((v = get_vpe(i)) != NULL) {
1207 v->state = VPE_STATE_INUSE;
1208 return v;
1209 }
1210 }
1211 return NULL;
1212}
1213
1214EXPORT_SYMBOL(vpe_alloc);
1215
1216/* start running from here */
1217int vpe_start(vpe_handle vpe, unsigned long start)
1218{
1219 struct vpe *v = vpe;
1220
1221 v->__start = start;
1222 return vpe_run(v);
1223}
1224
1225EXPORT_SYMBOL(vpe_start);
1226
1227/* halt it for now */
1228int vpe_stop(vpe_handle vpe)
1229{
1230 struct vpe *v = vpe;
1231 struct tc *t;
1232 unsigned int evpe_flags;
1233
1234 evpe_flags = dvpe();
1235
1236 if ((t = list_entry(v->tc.next, struct tc, tc)) != NULL) {
1237
1238 settc(t->index);
1239 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1240 }
1241
1242 evpe(evpe_flags);
1243
1244 return 0;
1245}
1246
1247EXPORT_SYMBOL(vpe_stop);
1248
1249/* I've done with it thank you */
1250int vpe_free(vpe_handle vpe)
1251{
1252 struct vpe *v = vpe;
1253 struct tc *t;
1254 unsigned int evpe_flags;
1255
1256 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
1257 return -ENOEXEC;
1258 }
1259
1260 evpe_flags = dvpe();
1261
1262 /* Put MVPE's into 'configuration state' */
1263 set_c0_mvpcontrol(MVPCONTROL_VPC);
1264
1265 settc(t->index);
1266 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1267
1268 /* halt the TC */
1269 write_tc_c0_tchalt(TCHALT_H);
1270 mips_ihb();
1271
1272 /* mark the TC unallocated */
1273 write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A);
1274
1275 v->state = VPE_STATE_UNUSED;
1276
1277 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1278 evpe(evpe_flags);
1279
1280 return 0;
1281}
1282
1283EXPORT_SYMBOL(vpe_free);
1284
1285void *vpe_get_shared(int index)
1286{
1287 struct vpe *v;
1288
1289 if ((v = get_vpe(index)) == NULL)
1290 return NULL;
1291
1292 return v->shared_ptr;
1293}
1294
1295EXPORT_SYMBOL(vpe_get_shared);
1296
1297int vpe_getuid(int index)
1298{
1299 struct vpe *v;
1300
1301 if ((v = get_vpe(index)) == NULL)
1302 return -1;
1303
1304 return v->uid;
1305}
1306
1307EXPORT_SYMBOL(vpe_getuid);
1308
1309int vpe_getgid(int index)
1310{
1311 struct vpe *v;
1312
1313 if ((v = get_vpe(index)) == NULL)
1314 return -1;
1315
1316 return v->gid;
1317}
1318
1319EXPORT_SYMBOL(vpe_getgid);
1320
1321int vpe_notify(int index, struct vpe_notifications *notify)
1322{
1323 struct vpe *v;
1324
1325 if ((v = get_vpe(index)) == NULL)
1326 return -1;
1327
1328 list_add(¬ify->list, &v->notify);
1329 return 0;
1330}
1331
1332EXPORT_SYMBOL(vpe_notify);
1333
1334char *vpe_getcwd(int index)
1335{
1336 struct vpe *v;
1337
1338 if ((v = get_vpe(index)) == NULL)
1339 return NULL;
1340
1341 return v->cwd;
1342}
1343
1344EXPORT_SYMBOL(vpe_getcwd);
1345
1346#ifdef CONFIG_MIPS_APSP_KSPD
1347static void kspd_sp_exit( int sp_id)
1348{
1349 cleanup_tc(get_tc(sp_id));
1350}
1351#endif
1352
1353static ssize_t store_kill(struct device *dev, struct device_attribute *attr,
1354 const char *buf, size_t len)
1355{
1356 struct vpe *vpe = get_vpe(tclimit);
1357 struct vpe_notifications *not;
1358
1359 list_for_each_entry(not, &vpe->notify, list) {
1360 not->stop(tclimit);
1361 }
1362
1363 release_progmem(vpe->load_addr);
1364 cleanup_tc(get_tc(tclimit));
1365 vpe_stop(vpe);
1366 vpe_free(vpe);
1367
1368 return len;
1369}
1370
1371static ssize_t show_ntcs(struct device *cd, struct device_attribute *attr,
1372 char *buf)
1373{
1374 struct vpe *vpe = get_vpe(tclimit);
1375
1376 return sprintf(buf, "%d\n", vpe->ntcs);
1377}
1378
1379static ssize_t store_ntcs(struct device *dev, struct device_attribute *attr,
1380 const char *buf, size_t len)
1381{
1382 struct vpe *vpe = get_vpe(tclimit);
1383 unsigned long new;
1384 char *endp;
1385
1386 new = simple_strtoul(buf, &endp, 0);
1387 if (endp == buf)
1388 goto out_einval;
1389
1390 if (new == 0 || new > (hw_tcs - tclimit))
1391 goto out_einval;
1392
1393 vpe->ntcs = new;
1394
1395 return len;
1396
1397out_einval:
1398 return -EINVAL;
1399}
1400
1401static struct device_attribute vpe_class_attributes[] = {
1402 __ATTR(kill, S_IWUSR, NULL, store_kill),
1403 __ATTR(ntcs, S_IRUGO | S_IWUSR, show_ntcs, store_ntcs),
1404 {}
1405};
1406
1407static void vpe_device_release(struct device *cd)
1408{
1409 kfree(cd);
1410}
1411
1412struct class vpe_class = {
1413 .name = "vpe",
1414 .owner = THIS_MODULE,
1415 .dev_release = vpe_device_release,
1416 .dev_attrs = vpe_class_attributes,
1417};
1418
1419struct device vpe_device;
1420
1421static int __init vpe_module_init(void)
1422{
1423 unsigned int mtflags, vpflags;
1424 unsigned long flags, val;
1425 struct vpe *v = NULL;
1426 struct tc *t;
1427 int tc, err;
1428
1429 if (!cpu_has_mipsmt) {
1430 printk("VPE loader: not a MIPS MT capable processor\n");
1431 return -ENODEV;
1432 }
1433
1434 if (vpelimit == 0) {
1435 printk(KERN_WARNING "No VPEs reserved for AP/SP, not "
1436 "initializing VPE loader.\nPass maxvpes=<n> argument as "
1437 "kernel argument\n");
1438
1439 return -ENODEV;
1440 }
1441
1442 if (tclimit == 0) {
1443 printk(KERN_WARNING "No TCs reserved for AP/SP, not "
1444 "initializing VPE loader.\nPass maxtcs=<n> argument as "
1445 "kernel argument\n");
1446
1447 return -ENODEV;
1448 }
1449
1450 major = register_chrdev(0, module_name, &vpe_fops);
1451 if (major < 0) {
1452 printk("VPE loader: unable to register character device\n");
1453 return major;
1454 }
1455
1456 err = class_register(&vpe_class);
1457 if (err) {
1458 printk(KERN_ERR "vpe_class registration failed\n");
1459 goto out_chrdev;
1460 }
1461
1462 device_initialize(&vpe_device);
1463 vpe_device.class = &vpe_class,
1464 vpe_device.parent = NULL,
1465 dev_set_name(&vpe_device, "vpe1");
1466 vpe_device.devt = MKDEV(major, minor);
1467 err = device_add(&vpe_device);
1468 if (err) {
1469 printk(KERN_ERR "Adding vpe_device failed\n");
1470 goto out_class;
1471 }
1472
1473 local_irq_save(flags);
1474 mtflags = dmt();
1475 vpflags = dvpe();
1476
1477 /* Put MVPE's into 'configuration state' */
1478 set_c0_mvpcontrol(MVPCONTROL_VPC);
1479
1480 /* dump_mtregs(); */
1481
1482 val = read_c0_mvpconf0();
1483 hw_tcs = (val & MVPCONF0_PTC) + 1;
1484 hw_vpes = ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
1485
1486 for (tc = tclimit; tc < hw_tcs; tc++) {
1487 /*
1488 * Must re-enable multithreading temporarily or in case we
1489 * reschedule send IPIs or similar we might hang.
1490 */
1491 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1492 evpe(vpflags);
1493 emt(mtflags);
1494 local_irq_restore(flags);
1495 t = alloc_tc(tc);
1496 if (!t) {
1497 err = -ENOMEM;
1498 goto out;
1499 }
1500
1501 local_irq_save(flags);
1502 mtflags = dmt();
1503 vpflags = dvpe();
1504 set_c0_mvpcontrol(MVPCONTROL_VPC);
1505
1506 /* VPE's */
1507 if (tc < hw_tcs) {
1508 settc(tc);
1509
1510 if ((v = alloc_vpe(tc)) == NULL) {
1511 printk(KERN_WARNING "VPE: unable to allocate VPE\n");
1512
1513 goto out_reenable;
1514 }
1515
1516 v->ntcs = hw_tcs - tclimit;
1517
1518 /* add the tc to the list of this vpe's tc's. */
1519 list_add(&t->tc, &v->tc);
1520
1521 /* deactivate all but vpe0 */
1522 if (tc >= tclimit) {
1523 unsigned long tmp = read_vpe_c0_vpeconf0();
1524
1525 tmp &= ~VPECONF0_VPA;
1526
1527 /* master VPE */
1528 tmp |= VPECONF0_MVP;
1529 write_vpe_c0_vpeconf0(tmp);
1530 }
1531
1532 /* disable multi-threading with TC's */
1533 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
1534
1535 if (tc >= vpelimit) {
1536 /*
1537 * Set config to be the same as vpe0,
1538 * particularly kseg0 coherency alg
1539 */
1540 write_vpe_c0_config(read_c0_config());
1541 }
1542 }
1543
1544 /* TC's */
1545 t->pvpe = v; /* set the parent vpe */
1546
1547 if (tc >= tclimit) {
1548 unsigned long tmp;
1549
1550 settc(tc);
1551
1552 /* Any TC that is bound to VPE0 gets left as is - in case
1553 we are running SMTC on VPE0. A TC that is bound to any
1554 other VPE gets bound to VPE0, ideally I'd like to make
1555 it homeless but it doesn't appear to let me bind a TC
1556 to a non-existent VPE. Which is perfectly reasonable.
1557
1558 The (un)bound state is visible to an EJTAG probe so may
1559 notify GDB...
1560 */
1561
1562 if (((tmp = read_tc_c0_tcbind()) & TCBIND_CURVPE)) {
1563 /* tc is bound >vpe0 */
1564 write_tc_c0_tcbind(tmp & ~TCBIND_CURVPE);
1565
1566 t->pvpe = get_vpe(0); /* set the parent vpe */
1567 }
1568
1569 /* halt the TC */
1570 write_tc_c0_tchalt(TCHALT_H);
1571 mips_ihb();
1572
1573 tmp = read_tc_c0_tcstatus();
1574
1575 /* mark not activated and not dynamically allocatable */
1576 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1577 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1578 write_tc_c0_tcstatus(tmp);
1579 }
1580 }
1581
1582out_reenable:
1583 /* release config state */
1584 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1585
1586 evpe(vpflags);
1587 emt(mtflags);
1588 local_irq_restore(flags);
1589
1590#ifdef CONFIG_MIPS_APSP_KSPD
1591 kspd_events.kspd_sp_exit = kspd_sp_exit;
1592#endif
1593 return 0;
1594
1595out_class:
1596 class_unregister(&vpe_class);
1597out_chrdev:
1598 unregister_chrdev(major, module_name);
1599
1600out:
1601 return err;
1602}
1603
1604static void __exit vpe_module_exit(void)
1605{
1606 struct vpe *v, *n;
1607
1608 device_del(&vpe_device);
1609 unregister_chrdev(major, module_name);
1610
1611 /* No locking needed here */
1612 list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list) {
1613 if (v->state != VPE_STATE_UNUSED)
1614 release_vpe(v);
1615 }
1616}
1617
1618module_init(vpe_module_init);
1619module_exit(vpe_module_exit);
1620MODULE_DESCRIPTION("MIPS VPE Loader");
1621MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
1622MODULE_LICENSE("GPL");