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1#ifndef _ASM_POWERPC_PROCESSOR_H
2#define _ASM_POWERPC_PROCESSOR_H
3
4/*
5 * Copyright (C) 2001 PPC 64 Team, IBM Corp
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13#include <asm/reg.h>
14
15#ifdef CONFIG_VSX
16#define TS_FPRWIDTH 2
17
18#ifdef __BIG_ENDIAN__
19#define TS_FPROFFSET 0
20#define TS_VSRLOWOFFSET 1
21#else
22#define TS_FPROFFSET 1
23#define TS_VSRLOWOFFSET 0
24#endif
25
26#else
27#define TS_FPRWIDTH 1
28#define TS_FPROFFSET 0
29#endif
30
31#ifdef CONFIG_PPC64
32/* Default SMT priority is set to 3. Use 11- 13bits to save priority. */
33#define PPR_PRIORITY 3
34#ifdef __ASSEMBLY__
35#define INIT_PPR (PPR_PRIORITY << 50)
36#else
37#define INIT_PPR ((u64)PPR_PRIORITY << 50)
38#endif /* __ASSEMBLY__ */
39#endif /* CONFIG_PPC64 */
40
41#ifndef __ASSEMBLY__
42#include <linux/compiler.h>
43#include <linux/cache.h>
44#include <asm/ptrace.h>
45#include <asm/types.h>
46#include <asm/hw_breakpoint.h>
47
48/* We do _not_ want to define new machine types at all, those must die
49 * in favor of using the device-tree
50 * -- BenH.
51 */
52
53/* PREP sub-platform types. Unused */
54#define _PREP_Motorola 0x01 /* motorola prep */
55#define _PREP_Firm 0x02 /* firmworks prep */
56#define _PREP_IBM 0x00 /* ibm prep */
57#define _PREP_Bull 0x03 /* bull prep */
58
59/* CHRP sub-platform types. These are arbitrary */
60#define _CHRP_Motorola 0x04 /* motorola chrp, the cobra */
61#define _CHRP_IBM 0x05 /* IBM chrp, the longtrail and longtrail 2 */
62#define _CHRP_Pegasos 0x06 /* Genesi/bplan's Pegasos and Pegasos2 */
63#define _CHRP_briq 0x07 /* TotalImpact's briQ */
64
65#if defined(__KERNEL__) && defined(CONFIG_PPC32)
66
67extern int _chrp_type;
68
69#endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
70
71/*
72 * Default implementation of macro that returns current
73 * instruction pointer ("program counter").
74 */
75#define current_text_addr() ({ __label__ _l; _l: &&_l;})
76
77/* Macros for adjusting thread priority (hardware multi-threading) */
78#define HMT_very_low() asm volatile("or 31,31,31 # very low priority")
79#define HMT_low() asm volatile("or 1,1,1 # low priority")
80#define HMT_medium_low() asm volatile("or 6,6,6 # medium low priority")
81#define HMT_medium() asm volatile("or 2,2,2 # medium priority")
82#define HMT_medium_high() asm volatile("or 5,5,5 # medium high priority")
83#define HMT_high() asm volatile("or 3,3,3 # high priority")
84
85#ifdef __KERNEL__
86
87struct task_struct;
88void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
89void release_thread(struct task_struct *);
90
91#ifdef CONFIG_PPC32
92
93#if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
94#error User TASK_SIZE overlaps with KERNEL_START address
95#endif
96#define TASK_SIZE (CONFIG_TASK_SIZE)
97
98/* This decides where the kernel will search for a free chunk of vm
99 * space during mmap's.
100 */
101#define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
102#endif
103
104#ifdef CONFIG_PPC64
105/* 64-bit user address space is 46-bits (64TB user VM) */
106#define TASK_SIZE_USER64 (0x0000400000000000UL)
107
108/*
109 * 32-bit user address space is 4GB - 1 page
110 * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
111 */
112#define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
113
114#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
115 TASK_SIZE_USER32 : TASK_SIZE_USER64)
116#define TASK_SIZE TASK_SIZE_OF(current)
117
118/* This decides where the kernel will search for a free chunk of vm
119 * space during mmap's.
120 */
121#define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
122#define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
123
124#define TASK_UNMAPPED_BASE ((is_32bit_task()) ? \
125 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
126#endif
127
128#ifdef __powerpc64__
129
130#define STACK_TOP_USER64 TASK_SIZE_USER64
131#define STACK_TOP_USER32 TASK_SIZE_USER32
132
133#define STACK_TOP (is_32bit_task() ? \
134 STACK_TOP_USER32 : STACK_TOP_USER64)
135
136#define STACK_TOP_MAX STACK_TOP_USER64
137
138#else /* __powerpc64__ */
139
140#define STACK_TOP TASK_SIZE
141#define STACK_TOP_MAX STACK_TOP
142
143#endif /* __powerpc64__ */
144
145typedef struct {
146 unsigned long seg;
147} mm_segment_t;
148
149#define TS_FPR(i) fp_state.fpr[i][TS_FPROFFSET]
150#define TS_TRANS_FPR(i) transact_fp.fpr[i][TS_FPROFFSET]
151
152/* FP and VSX 0-31 register set */
153struct thread_fp_state {
154 u64 fpr[32][TS_FPRWIDTH] __attribute__((aligned(16)));
155 u64 fpscr; /* Floating point status */
156};
157
158/* Complete AltiVec register set including VSCR */
159struct thread_vr_state {
160 vector128 vr[32] __attribute__((aligned(16)));
161 vector128 vscr __attribute__((aligned(16)));
162};
163
164struct debug_reg {
165#ifdef CONFIG_PPC_ADV_DEBUG_REGS
166 /*
167 * The following help to manage the use of Debug Control Registers
168 * om the BookE platforms.
169 */
170 uint32_t dbcr0;
171 uint32_t dbcr1;
172#ifdef CONFIG_BOOKE
173 uint32_t dbcr2;
174#endif
175 /*
176 * The stored value of the DBSR register will be the value at the
177 * last debug interrupt. This register can only be read from the
178 * user (will never be written to) and has value while helping to
179 * describe the reason for the last debug trap. Torez
180 */
181 uint32_t dbsr;
182 /*
183 * The following will contain addresses used by debug applications
184 * to help trace and trap on particular address locations.
185 * The bits in the Debug Control Registers above help define which
186 * of the following registers will contain valid data and/or addresses.
187 */
188 unsigned long iac1;
189 unsigned long iac2;
190#if CONFIG_PPC_ADV_DEBUG_IACS > 2
191 unsigned long iac3;
192 unsigned long iac4;
193#endif
194 unsigned long dac1;
195 unsigned long dac2;
196#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
197 unsigned long dvc1;
198 unsigned long dvc2;
199#endif
200#endif
201};
202
203struct thread_struct {
204 unsigned long ksp; /* Kernel stack pointer */
205
206#ifdef CONFIG_PPC64
207 unsigned long ksp_vsid;
208#endif
209 struct pt_regs *regs; /* Pointer to saved register state */
210 mm_segment_t fs; /* for get_fs() validation */
211#ifdef CONFIG_BOOKE
212 /* BookE base exception scratch space; align on cacheline */
213 unsigned long normsave[8] ____cacheline_aligned;
214#endif
215#ifdef CONFIG_PPC32
216 void *pgdir; /* root of page-table tree */
217 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */
218#endif
219 /* Debug Registers */
220 struct debug_reg debug;
221 struct thread_fp_state fp_state;
222 struct thread_fp_state *fp_save_area;
223 int fpexc_mode; /* floating-point exception mode */
224 unsigned int align_ctl; /* alignment handling control */
225#ifdef CONFIG_PPC64
226 unsigned long start_tb; /* Start purr when proc switched in */
227 unsigned long accum_tb; /* Total accumilated purr for process */
228#ifdef CONFIG_HAVE_HW_BREAKPOINT
229 struct perf_event *ptrace_bps[HBP_NUM];
230 /*
231 * Helps identify source of single-step exception and subsequent
232 * hw-breakpoint enablement
233 */
234 struct perf_event *last_hit_ubp;
235#endif /* CONFIG_HAVE_HW_BREAKPOINT */
236#endif
237 struct arch_hw_breakpoint hw_brk; /* info on the hardware breakpoint */
238 unsigned long trap_nr; /* last trap # on this thread */
239 u8 load_fp;
240#ifdef CONFIG_ALTIVEC
241 u8 load_vec;
242 struct thread_vr_state vr_state;
243 struct thread_vr_state *vr_save_area;
244 unsigned long vrsave;
245 int used_vr; /* set if process has used altivec */
246#endif /* CONFIG_ALTIVEC */
247#ifdef CONFIG_VSX
248 /* VSR status */
249 int used_vsr; /* set if process has used VSX */
250#endif /* CONFIG_VSX */
251#ifdef CONFIG_SPE
252 unsigned long evr[32]; /* upper 32-bits of SPE regs */
253 u64 acc; /* Accumulator */
254 unsigned long spefscr; /* SPE & eFP status */
255 unsigned long spefscr_last; /* SPEFSCR value on last prctl
256 call or trap return */
257 int used_spe; /* set if process has used spe */
258#endif /* CONFIG_SPE */
259#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
260 u64 tm_tfhar; /* Transaction fail handler addr */
261 u64 tm_texasr; /* Transaction exception & summary */
262 u64 tm_tfiar; /* Transaction fail instr address reg */
263 struct pt_regs ckpt_regs; /* Checkpointed registers */
264
265 unsigned long tm_tar;
266 unsigned long tm_ppr;
267 unsigned long tm_dscr;
268
269 /*
270 * Transactional FP and VSX 0-31 register set.
271 * NOTE: the sense of these is the opposite of the integer ckpt_regs!
272 *
273 * When a transaction is active/signalled/scheduled etc., *regs is the
274 * most recent set of/speculated GPRs with ckpt_regs being the older
275 * checkpointed regs to which we roll back if transaction aborts.
276 *
277 * However, fpr[] is the checkpointed 'base state' of FP regs, and
278 * transact_fpr[] is the new set of transactional values.
279 * VRs work the same way.
280 */
281 struct thread_fp_state transact_fp;
282 struct thread_vr_state transact_vr;
283 unsigned long transact_vrsave;
284#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
285#ifdef CONFIG_KVM_BOOK3S_32_HANDLER
286 void* kvm_shadow_vcpu; /* KVM internal data */
287#endif /* CONFIG_KVM_BOOK3S_32_HANDLER */
288#if defined(CONFIG_KVM) && defined(CONFIG_BOOKE)
289 struct kvm_vcpu *kvm_vcpu;
290#endif
291#ifdef CONFIG_PPC64
292 unsigned long dscr;
293 unsigned long fscr;
294 /*
295 * This member element dscr_inherit indicates that the process
296 * has explicitly attempted and changed the DSCR register value
297 * for itself. Hence kernel wont use the default CPU DSCR value
298 * contained in the PACA structure anymore during process context
299 * switch. Once this variable is set, this behaviour will also be
300 * inherited to all the children of this process from that point
301 * onwards.
302 */
303 int dscr_inherit;
304 unsigned long ppr; /* used to save/restore SMT priority */
305#endif
306#ifdef CONFIG_PPC_BOOK3S_64
307 unsigned long tar;
308 unsigned long ebbrr;
309 unsigned long ebbhr;
310 unsigned long bescr;
311 unsigned long siar;
312 unsigned long sdar;
313 unsigned long sier;
314 unsigned long mmcr2;
315 unsigned mmcr0;
316 unsigned used_ebb;
317#endif
318};
319
320#define ARCH_MIN_TASKALIGN 16
321
322#define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
323#define INIT_SP_LIMIT \
324 (_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack)
325
326#ifdef CONFIG_SPE
327#define SPEFSCR_INIT \
328 .spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE, \
329 .spefscr_last = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE,
330#else
331#define SPEFSCR_INIT
332#endif
333
334#ifdef CONFIG_PPC32
335#define INIT_THREAD { \
336 .ksp = INIT_SP, \
337 .ksp_limit = INIT_SP_LIMIT, \
338 .fs = KERNEL_DS, \
339 .pgdir = swapper_pg_dir, \
340 .fpexc_mode = MSR_FE0 | MSR_FE1, \
341 SPEFSCR_INIT \
342}
343#else
344#define INIT_THREAD { \
345 .ksp = INIT_SP, \
346 .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
347 .fs = KERNEL_DS, \
348 .fpexc_mode = 0, \
349 .ppr = INIT_PPR, \
350}
351#endif
352
353/*
354 * Return saved PC of a blocked thread. For now, this is the "user" PC
355 */
356#define thread_saved_pc(tsk) \
357 ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
358
359#define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.regs)
360
361unsigned long get_wchan(struct task_struct *p);
362
363#define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
364#define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
365
366/* Get/set floating-point exception mode */
367#define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
368#define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
369
370extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
371extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
372
373#define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
374#define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
375
376extern int get_endian(struct task_struct *tsk, unsigned long adr);
377extern int set_endian(struct task_struct *tsk, unsigned int val);
378
379#define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr))
380#define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val))
381
382extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
383extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
384
385extern void load_fp_state(struct thread_fp_state *fp);
386extern void store_fp_state(struct thread_fp_state *fp);
387extern void load_vr_state(struct thread_vr_state *vr);
388extern void store_vr_state(struct thread_vr_state *vr);
389
390static inline unsigned int __unpack_fe01(unsigned long msr_bits)
391{
392 return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
393}
394
395static inline unsigned long __pack_fe01(unsigned int fpmode)
396{
397 return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
398}
399
400#ifdef CONFIG_PPC64
401#define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0)
402#else
403#define cpu_relax() barrier()
404#endif
405
406#define cpu_relax_lowlatency() cpu_relax()
407
408/* Check that a certain kernel stack pointer is valid in task_struct p */
409int validate_sp(unsigned long sp, struct task_struct *p,
410 unsigned long nbytes);
411
412/*
413 * Prefetch macros.
414 */
415#define ARCH_HAS_PREFETCH
416#define ARCH_HAS_PREFETCHW
417#define ARCH_HAS_SPINLOCK_PREFETCH
418
419static inline void prefetch(const void *x)
420{
421 if (unlikely(!x))
422 return;
423
424 __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
425}
426
427static inline void prefetchw(const void *x)
428{
429 if (unlikely(!x))
430 return;
431
432 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
433}
434
435#define spin_lock_prefetch(x) prefetchw(x)
436
437#define HAVE_ARCH_PICK_MMAP_LAYOUT
438
439#ifdef CONFIG_PPC64
440static inline unsigned long get_clean_sp(unsigned long sp, int is_32)
441{
442 if (is_32)
443 return sp & 0x0ffffffffUL;
444 return sp;
445}
446#else
447static inline unsigned long get_clean_sp(unsigned long sp, int is_32)
448{
449 return sp;
450}
451#endif
452
453extern unsigned long cpuidle_disable;
454enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF};
455
456extern int powersave_nap; /* set if nap mode can be used in idle loop */
457extern unsigned long power7_nap(int check_irq);
458extern unsigned long power7_sleep(void);
459extern unsigned long power7_winkle(void);
460extern void flush_instruction_cache(void);
461extern void hard_reset_now(void);
462extern void poweroff_now(void);
463extern int fix_alignment(struct pt_regs *);
464extern void cvt_fd(float *from, double *to);
465extern void cvt_df(double *from, float *to);
466extern void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);
467
468#ifdef CONFIG_PPC64
469/*
470 * We handle most unaligned accesses in hardware. On the other hand
471 * unaligned DMA can be very expensive on some ppc64 IO chips (it does
472 * powers of 2 writes until it reaches sufficient alignment).
473 *
474 * Based on this we disable the IP header alignment in network drivers.
475 */
476#define NET_IP_ALIGN 0
477#endif
478
479#endif /* __KERNEL__ */
480#endif /* __ASSEMBLY__ */
481#endif /* _ASM_POWERPC_PROCESSOR_H */
1#ifndef _ASM_POWERPC_PROCESSOR_H
2#define _ASM_POWERPC_PROCESSOR_H
3
4/*
5 * Copyright (C) 2001 PPC 64 Team, IBM Corp
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13#include <asm/reg.h>
14
15#ifdef CONFIG_VSX
16#define TS_FPRWIDTH 2
17#else
18#define TS_FPRWIDTH 1
19#endif
20
21#ifndef __ASSEMBLY__
22#include <linux/compiler.h>
23#include <linux/cache.h>
24#include <asm/ptrace.h>
25#include <asm/types.h>
26
27/* We do _not_ want to define new machine types at all, those must die
28 * in favor of using the device-tree
29 * -- BenH.
30 */
31
32/* PREP sub-platform types see residual.h for these */
33#define _PREP_Motorola 0x01 /* motorola prep */
34#define _PREP_Firm 0x02 /* firmworks prep */
35#define _PREP_IBM 0x00 /* ibm prep */
36#define _PREP_Bull 0x03 /* bull prep */
37
38/* CHRP sub-platform types. These are arbitrary */
39#define _CHRP_Motorola 0x04 /* motorola chrp, the cobra */
40#define _CHRP_IBM 0x05 /* IBM chrp, the longtrail and longtrail 2 */
41#define _CHRP_Pegasos 0x06 /* Genesi/bplan's Pegasos and Pegasos2 */
42#define _CHRP_briq 0x07 /* TotalImpact's briQ */
43
44#if defined(__KERNEL__) && defined(CONFIG_PPC32)
45
46extern int _chrp_type;
47
48#ifdef CONFIG_PPC_PREP
49
50/* what kind of prep workstation we are */
51extern int _prep_type;
52
53#endif /* CONFIG_PPC_PREP */
54
55#endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
56
57/*
58 * Default implementation of macro that returns current
59 * instruction pointer ("program counter").
60 */
61#define current_text_addr() ({ __label__ _l; _l: &&_l;})
62
63/* Macros for adjusting thread priority (hardware multi-threading) */
64#define HMT_very_low() asm volatile("or 31,31,31 # very low priority")
65#define HMT_low() asm volatile("or 1,1,1 # low priority")
66#define HMT_medium_low() asm volatile("or 6,6,6 # medium low priority")
67#define HMT_medium() asm volatile("or 2,2,2 # medium priority")
68#define HMT_medium_high() asm volatile("or 5,5,5 # medium high priority")
69#define HMT_high() asm volatile("or 3,3,3 # high priority")
70
71#ifdef __KERNEL__
72
73struct task_struct;
74void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
75void release_thread(struct task_struct *);
76
77/* Create a new kernel thread. */
78extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
79
80/* Lazy FPU handling on uni-processor */
81extern struct task_struct *last_task_used_math;
82extern struct task_struct *last_task_used_altivec;
83extern struct task_struct *last_task_used_vsx;
84extern struct task_struct *last_task_used_spe;
85
86#ifdef CONFIG_PPC32
87
88#if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
89#error User TASK_SIZE overlaps with KERNEL_START address
90#endif
91#define TASK_SIZE (CONFIG_TASK_SIZE)
92
93/* This decides where the kernel will search for a free chunk of vm
94 * space during mmap's.
95 */
96#define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
97#endif
98
99#ifdef CONFIG_PPC64
100/* 64-bit user address space is 44-bits (16TB user VM) */
101#define TASK_SIZE_USER64 (0x0000100000000000UL)
102
103/*
104 * 32-bit user address space is 4GB - 1 page
105 * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
106 */
107#define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
108
109#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
110 TASK_SIZE_USER32 : TASK_SIZE_USER64)
111#define TASK_SIZE TASK_SIZE_OF(current)
112
113/* This decides where the kernel will search for a free chunk of vm
114 * space during mmap's.
115 */
116#define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
117#define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
118
119#define TASK_UNMAPPED_BASE ((is_32bit_task()) ? \
120 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
121#endif
122
123#ifdef __powerpc64__
124
125#define STACK_TOP_USER64 TASK_SIZE_USER64
126#define STACK_TOP_USER32 TASK_SIZE_USER32
127
128#define STACK_TOP (is_32bit_task() ? \
129 STACK_TOP_USER32 : STACK_TOP_USER64)
130
131#define STACK_TOP_MAX STACK_TOP_USER64
132
133#else /* __powerpc64__ */
134
135#define STACK_TOP TASK_SIZE
136#define STACK_TOP_MAX STACK_TOP
137
138#endif /* __powerpc64__ */
139
140typedef struct {
141 unsigned long seg;
142} mm_segment_t;
143
144#define TS_FPROFFSET 0
145#define TS_VSRLOWOFFSET 1
146#define TS_FPR(i) fpr[i][TS_FPROFFSET]
147
148struct thread_struct {
149 unsigned long ksp; /* Kernel stack pointer */
150 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */
151
152#ifdef CONFIG_PPC64
153 unsigned long ksp_vsid;
154#endif
155 struct pt_regs *regs; /* Pointer to saved register state */
156 mm_segment_t fs; /* for get_fs() validation */
157#ifdef CONFIG_BOOKE
158 /* BookE base exception scratch space; align on cacheline */
159 unsigned long normsave[8] ____cacheline_aligned;
160#endif
161#ifdef CONFIG_PPC32
162 void *pgdir; /* root of page-table tree */
163#endif
164#ifdef CONFIG_PPC_ADV_DEBUG_REGS
165 /*
166 * The following help to manage the use of Debug Control Registers
167 * om the BookE platforms.
168 */
169 unsigned long dbcr0;
170 unsigned long dbcr1;
171#ifdef CONFIG_BOOKE
172 unsigned long dbcr2;
173#endif
174 /*
175 * The stored value of the DBSR register will be the value at the
176 * last debug interrupt. This register can only be read from the
177 * user (will never be written to) and has value while helping to
178 * describe the reason for the last debug trap. Torez
179 */
180 unsigned long dbsr;
181 /*
182 * The following will contain addresses used by debug applications
183 * to help trace and trap on particular address locations.
184 * The bits in the Debug Control Registers above help define which
185 * of the following registers will contain valid data and/or addresses.
186 */
187 unsigned long iac1;
188 unsigned long iac2;
189#if CONFIG_PPC_ADV_DEBUG_IACS > 2
190 unsigned long iac3;
191 unsigned long iac4;
192#endif
193 unsigned long dac1;
194 unsigned long dac2;
195#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
196 unsigned long dvc1;
197 unsigned long dvc2;
198#endif
199#endif
200 /* FP and VSX 0-31 register set */
201 double fpr[32][TS_FPRWIDTH];
202 struct {
203
204 unsigned int pad;
205 unsigned int val; /* Floating point status */
206 } fpscr;
207 int fpexc_mode; /* floating-point exception mode */
208 unsigned int align_ctl; /* alignment handling control */
209#ifdef CONFIG_PPC64
210 unsigned long start_tb; /* Start purr when proc switched in */
211 unsigned long accum_tb; /* Total accumilated purr for process */
212#ifdef CONFIG_HAVE_HW_BREAKPOINT
213 struct perf_event *ptrace_bps[HBP_NUM];
214 /*
215 * Helps identify source of single-step exception and subsequent
216 * hw-breakpoint enablement
217 */
218 struct perf_event *last_hit_ubp;
219#endif /* CONFIG_HAVE_HW_BREAKPOINT */
220#endif
221 unsigned long dabr; /* Data address breakpoint register */
222#ifdef CONFIG_ALTIVEC
223 /* Complete AltiVec register set */
224 vector128 vr[32] __attribute__((aligned(16)));
225 /* AltiVec status */
226 vector128 vscr __attribute__((aligned(16)));
227 unsigned long vrsave;
228 int used_vr; /* set if process has used altivec */
229#endif /* CONFIG_ALTIVEC */
230#ifdef CONFIG_VSX
231 /* VSR status */
232 int used_vsr; /* set if process has used altivec */
233#endif /* CONFIG_VSX */
234#ifdef CONFIG_SPE
235 unsigned long evr[32]; /* upper 32-bits of SPE regs */
236 u64 acc; /* Accumulator */
237 unsigned long spefscr; /* SPE & eFP status */
238 int used_spe; /* set if process has used spe */
239#endif /* CONFIG_SPE */
240#ifdef CONFIG_KVM_BOOK3S_32_HANDLER
241 void* kvm_shadow_vcpu; /* KVM internal data */
242#endif /* CONFIG_KVM_BOOK3S_32_HANDLER */
243#if defined(CONFIG_KVM) && defined(CONFIG_BOOKE)
244 struct kvm_vcpu *kvm_vcpu;
245#endif
246#ifdef CONFIG_PPC64
247 unsigned long dscr;
248 int dscr_inherit;
249#endif
250};
251
252#define ARCH_MIN_TASKALIGN 16
253
254#define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
255#define INIT_SP_LIMIT \
256 (_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack)
257
258#ifdef CONFIG_SPE
259#define SPEFSCR_INIT .spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE,
260#else
261#define SPEFSCR_INIT
262#endif
263
264#ifdef CONFIG_PPC32
265#define INIT_THREAD { \
266 .ksp = INIT_SP, \
267 .ksp_limit = INIT_SP_LIMIT, \
268 .fs = KERNEL_DS, \
269 .pgdir = swapper_pg_dir, \
270 .fpexc_mode = MSR_FE0 | MSR_FE1, \
271 SPEFSCR_INIT \
272}
273#else
274#define INIT_THREAD { \
275 .ksp = INIT_SP, \
276 .ksp_limit = INIT_SP_LIMIT, \
277 .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
278 .fs = KERNEL_DS, \
279 .fpr = {{0}}, \
280 .fpscr = { .val = 0, }, \
281 .fpexc_mode = 0, \
282}
283#endif
284
285/*
286 * Return saved PC of a blocked thread. For now, this is the "user" PC
287 */
288#define thread_saved_pc(tsk) \
289 ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
290
291#define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.regs)
292
293unsigned long get_wchan(struct task_struct *p);
294
295#define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
296#define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
297
298/* Get/set floating-point exception mode */
299#define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
300#define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
301
302extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
303extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
304
305#define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
306#define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
307
308extern int get_endian(struct task_struct *tsk, unsigned long adr);
309extern int set_endian(struct task_struct *tsk, unsigned int val);
310
311#define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr))
312#define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val))
313
314extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
315extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
316
317static inline unsigned int __unpack_fe01(unsigned long msr_bits)
318{
319 return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
320}
321
322static inline unsigned long __pack_fe01(unsigned int fpmode)
323{
324 return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
325}
326
327#ifdef CONFIG_PPC64
328#define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0)
329#else
330#define cpu_relax() barrier()
331#endif
332
333/* Check that a certain kernel stack pointer is valid in task_struct p */
334int validate_sp(unsigned long sp, struct task_struct *p,
335 unsigned long nbytes);
336
337/*
338 * Prefetch macros.
339 */
340#define ARCH_HAS_PREFETCH
341#define ARCH_HAS_PREFETCHW
342#define ARCH_HAS_SPINLOCK_PREFETCH
343
344static inline void prefetch(const void *x)
345{
346 if (unlikely(!x))
347 return;
348
349 __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
350}
351
352static inline void prefetchw(const void *x)
353{
354 if (unlikely(!x))
355 return;
356
357 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
358}
359
360#define spin_lock_prefetch(x) prefetchw(x)
361
362#ifdef CONFIG_PPC64
363#define HAVE_ARCH_PICK_MMAP_LAYOUT
364#endif
365
366#ifdef CONFIG_PPC64
367static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32)
368{
369 unsigned long sp;
370
371 if (is_32)
372 sp = regs->gpr[1] & 0x0ffffffffUL;
373 else
374 sp = regs->gpr[1];
375
376 return sp;
377}
378#else
379static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32)
380{
381 return regs->gpr[1];
382}
383#endif
384
385extern unsigned long cpuidle_disable;
386enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF};
387
388extern int powersave_nap; /* set if nap mode can be used in idle loop */
389
390#ifdef CONFIG_PSERIES_IDLE
391extern void update_smt_snooze_delay(int snooze);
392extern int pseries_notify_cpuidle_add_cpu(int cpu);
393#else
394static inline void update_smt_snooze_delay(int snooze) {}
395static inline int pseries_notify_cpuidle_add_cpu(int cpu) { return 0; }
396#endif
397
398extern void flush_instruction_cache(void);
399extern void hard_reset_now(void);
400extern void poweroff_now(void);
401extern int fix_alignment(struct pt_regs *);
402extern void cvt_fd(float *from, double *to);
403extern void cvt_df(double *from, float *to);
404extern void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);
405
406#ifdef CONFIG_PPC64
407/*
408 * We handle most unaligned accesses in hardware. On the other hand
409 * unaligned DMA can be very expensive on some ppc64 IO chips (it does
410 * powers of 2 writes until it reaches sufficient alignment).
411 *
412 * Based on this we disable the IP header alignment in network drivers.
413 */
414#define NET_IP_ALIGN 0
415#endif
416
417#endif /* __KERNEL__ */
418#endif /* __ASSEMBLY__ */
419#endif /* _ASM_POWERPC_PROCESSOR_H */