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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * PowerPC version
4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
5 *
6 * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
7 * and Cort Dougan (PReP) (cort@cs.nmt.edu)
8 * Copyright (C) 1996 Paul Mackerras
9 * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
10 *
11 * Derived from "arch/i386/mm/init.c"
12 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
13 */
14
15#include <linux/export.h>
16#include <linux/sched.h>
17#include <linux/kernel.h>
18#include <linux/errno.h>
19#include <linux/string.h>
20#include <linux/gfp.h>
21#include <linux/types.h>
22#include <linux/mm.h>
23#include <linux/stddef.h>
24#include <linux/init.h>
25#include <linux/memblock.h>
26#include <linux/highmem.h>
27#include <linux/initrd.h>
28#include <linux/pagemap.h>
29#include <linux/suspend.h>
30#include <linux/hugetlb.h>
31#include <linux/slab.h>
32#include <linux/vmalloc.h>
33#include <linux/memremap.h>
34
35#include <asm/pgalloc.h>
36#include <asm/prom.h>
37#include <asm/io.h>
38#include <asm/mmu_context.h>
39#include <asm/pgtable.h>
40#include <asm/mmu.h>
41#include <asm/smp.h>
42#include <asm/machdep.h>
43#include <asm/btext.h>
44#include <asm/tlb.h>
45#include <asm/sections.h>
46#include <asm/sparsemem.h>
47#include <asm/vdso.h>
48#include <asm/fixmap.h>
49#include <asm/swiotlb.h>
50#include <asm/rtas.h>
51
52#include <mm/mmu_decl.h>
53
54#ifndef CPU_FTR_COHERENT_ICACHE
55#define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */
56#define CPU_FTR_NOEXECUTE 0
57#endif
58
59unsigned long long memory_limit;
60bool init_mem_is_free;
61
62#ifdef CONFIG_HIGHMEM
63pte_t *kmap_pte;
64EXPORT_SYMBOL(kmap_pte);
65pgprot_t kmap_prot;
66EXPORT_SYMBOL(kmap_prot);
67
68static inline pte_t *virt_to_kpte(unsigned long vaddr)
69{
70 return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
71 vaddr), vaddr), vaddr);
72}
73#endif
74
75pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
76 unsigned long size, pgprot_t vma_prot)
77{
78 if (ppc_md.phys_mem_access_prot)
79 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
80
81 if (!page_is_ram(pfn))
82 vma_prot = pgprot_noncached(vma_prot);
83
84 return vma_prot;
85}
86EXPORT_SYMBOL(phys_mem_access_prot);
87
88#ifdef CONFIG_MEMORY_HOTPLUG
89
90#ifdef CONFIG_NUMA
91int memory_add_physaddr_to_nid(u64 start)
92{
93 return hot_add_scn_to_nid(start);
94}
95#endif
96
97int __weak create_section_mapping(unsigned long start, unsigned long end, int nid)
98{
99 return -ENODEV;
100}
101
102int __weak remove_section_mapping(unsigned long start, unsigned long end)
103{
104 return -ENODEV;
105}
106
107int __ref arch_add_memory(int nid, u64 start, u64 size,
108 struct mhp_restrictions *restrictions)
109{
110 unsigned long start_pfn = start >> PAGE_SHIFT;
111 unsigned long nr_pages = size >> PAGE_SHIFT;
112 int rc;
113
114 resize_hpt_for_hotplug(memblock_phys_mem_size());
115
116 start = (unsigned long)__va(start);
117 rc = create_section_mapping(start, start + size, nid);
118 if (rc) {
119 pr_warn("Unable to create mapping for hot added memory 0x%llx..0x%llx: %d\n",
120 start, start + size, rc);
121 return -EFAULT;
122 }
123 flush_dcache_range(start, start + size);
124
125 return __add_pages(nid, start_pfn, nr_pages, restrictions);
126}
127
128void __ref arch_remove_memory(int nid, u64 start, u64 size,
129 struct vmem_altmap *altmap)
130{
131 unsigned long start_pfn = start >> PAGE_SHIFT;
132 unsigned long nr_pages = size >> PAGE_SHIFT;
133 struct page *page = pfn_to_page(start_pfn) + vmem_altmap_offset(altmap);
134 int ret;
135
136 __remove_pages(page_zone(page), start_pfn, nr_pages, altmap);
137
138 /* Remove htab bolted mappings for this section of memory */
139 start = (unsigned long)__va(start);
140 flush_dcache_range(start, start + size);
141 ret = remove_section_mapping(start, start + size);
142 WARN_ON_ONCE(ret);
143
144 /* Ensure all vmalloc mappings are flushed in case they also
145 * hit that section of memory
146 */
147 vm_unmap_aliases();
148
149 if (resize_hpt_for_hotplug(memblock_phys_mem_size()) == -ENOSPC)
150 pr_warn("Hash collision while resizing HPT\n");
151}
152#endif
153
154#ifndef CONFIG_NEED_MULTIPLE_NODES
155void __init mem_topology_setup(void)
156{
157 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
158 min_low_pfn = MEMORY_START >> PAGE_SHIFT;
159#ifdef CONFIG_HIGHMEM
160 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
161#endif
162
163 /* Place all memblock_regions in the same node and merge contiguous
164 * memblock_regions
165 */
166 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
167}
168
169void __init initmem_init(void)
170{
171 /* XXX need to clip this if using highmem? */
172 sparse_memory_present_with_active_regions(0);
173 sparse_init();
174}
175
176/* mark pages that don't exist as nosave */
177static int __init mark_nonram_nosave(void)
178{
179 struct memblock_region *reg, *prev = NULL;
180
181 for_each_memblock(memory, reg) {
182 if (prev &&
183 memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg))
184 register_nosave_region(memblock_region_memory_end_pfn(prev),
185 memblock_region_memory_base_pfn(reg));
186 prev = reg;
187 }
188 return 0;
189}
190#else /* CONFIG_NEED_MULTIPLE_NODES */
191static int __init mark_nonram_nosave(void)
192{
193 return 0;
194}
195#endif
196
197/*
198 * Zones usage:
199 *
200 * We setup ZONE_DMA to be 31-bits on all platforms and ZONE_NORMAL to be
201 * everything else. GFP_DMA32 page allocations automatically fall back to
202 * ZONE_DMA.
203 *
204 * By using 31-bit unconditionally, we can exploit ARCH_ZONE_DMA_BITS to
205 * inform the generic DMA mapping code. 32-bit only devices (if not handled
206 * by an IOMMU anyway) will take a first dip into ZONE_NORMAL and get
207 * otherwise served by ZONE_DMA.
208 */
209static unsigned long max_zone_pfns[MAX_NR_ZONES];
210
211/*
212 * paging_init() sets up the page tables - in fact we've already done this.
213 */
214void __init paging_init(void)
215{
216 unsigned long long total_ram = memblock_phys_mem_size();
217 phys_addr_t top_of_ram = memblock_end_of_DRAM();
218
219#ifdef CONFIG_PPC32
220 unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1);
221 unsigned long end = __fix_to_virt(FIX_HOLE);
222
223 for (; v < end; v += PAGE_SIZE)
224 map_kernel_page(v, 0, __pgprot(0)); /* XXX gross */
225#endif
226
227#ifdef CONFIG_HIGHMEM
228 map_kernel_page(PKMAP_BASE, 0, __pgprot(0)); /* XXX gross */
229 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
230
231 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
232 kmap_prot = PAGE_KERNEL;
233#endif /* CONFIG_HIGHMEM */
234
235 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
236 (unsigned long long)top_of_ram, total_ram);
237 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
238 (long int)((top_of_ram - total_ram) >> 20));
239
240#ifdef CONFIG_ZONE_DMA
241 max_zone_pfns[ZONE_DMA] = min(max_low_pfn,
242 1UL << (ARCH_ZONE_DMA_BITS - PAGE_SHIFT));
243#endif
244 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
245#ifdef CONFIG_HIGHMEM
246 max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
247#endif
248
249 free_area_init_nodes(max_zone_pfns);
250
251 mark_nonram_nosave();
252}
253
254void __init mem_init(void)
255{
256 /*
257 * book3s is limited to 16 page sizes due to encoding this in
258 * a 4-bit field for slices.
259 */
260 BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
261
262#ifdef CONFIG_SWIOTLB
263 swiotlb_init(0);
264#endif
265
266 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
267 set_max_mapnr(max_pfn);
268 memblock_free_all();
269
270#ifdef CONFIG_HIGHMEM
271 {
272 unsigned long pfn, highmem_mapnr;
273
274 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
275 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
276 phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
277 struct page *page = pfn_to_page(pfn);
278 if (!memblock_is_reserved(paddr))
279 free_highmem_page(page);
280 }
281 }
282#endif /* CONFIG_HIGHMEM */
283
284#if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP)
285 /*
286 * If smp is enabled, next_tlbcam_idx is initialized in the cpu up
287 * functions.... do it here for the non-smp case.
288 */
289 per_cpu(next_tlbcam_idx, smp_processor_id()) =
290 (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
291#endif
292
293 mem_init_print_info(NULL);
294#ifdef CONFIG_PPC32
295 pr_info("Kernel virtual memory layout:\n");
296#ifdef CONFIG_KASAN
297 pr_info(" * 0x%08lx..0x%08lx : kasan shadow mem\n",
298 KASAN_SHADOW_START, KASAN_SHADOW_END);
299#endif
300 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
301#ifdef CONFIG_HIGHMEM
302 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
303 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
304#endif /* CONFIG_HIGHMEM */
305 if (ioremap_bot != IOREMAP_TOP)
306 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
307 ioremap_bot, IOREMAP_TOP);
308 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
309 VMALLOC_START, VMALLOC_END);
310#endif /* CONFIG_PPC32 */
311}
312
313void free_initmem(void)
314{
315 ppc_md.progress = ppc_printk_progress;
316 mark_initmem_nx();
317 init_mem_is_free = true;
318 free_initmem_default(POISON_FREE_INITMEM);
319}
320
321/*
322 * This is called when a page has been modified by the kernel.
323 * It just marks the page as not i-cache clean. We do the i-cache
324 * flush later when the page is given to a user process, if necessary.
325 */
326void flush_dcache_page(struct page *page)
327{
328 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
329 return;
330 /* avoid an atomic op if possible */
331 if (test_bit(PG_arch_1, &page->flags))
332 clear_bit(PG_arch_1, &page->flags);
333}
334EXPORT_SYMBOL(flush_dcache_page);
335
336void flush_dcache_icache_page(struct page *page)
337{
338#ifdef CONFIG_HUGETLB_PAGE
339 if (PageCompound(page)) {
340 flush_dcache_icache_hugepage(page);
341 return;
342 }
343#endif
344#if defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC64)
345 /* On 8xx there is no need to kmap since highmem is not supported */
346 __flush_dcache_icache(page_address(page));
347#else
348 if (IS_ENABLED(CONFIG_BOOKE) || sizeof(phys_addr_t) > sizeof(void *)) {
349 void *start = kmap_atomic(page);
350 __flush_dcache_icache(start);
351 kunmap_atomic(start);
352 } else {
353 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
354 }
355#endif
356}
357EXPORT_SYMBOL(flush_dcache_icache_page);
358
359void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
360{
361 clear_page(page);
362
363 /*
364 * We shouldn't have to do this, but some versions of glibc
365 * require it (ld.so assumes zero filled pages are icache clean)
366 * - Anton
367 */
368 flush_dcache_page(pg);
369}
370EXPORT_SYMBOL(clear_user_page);
371
372void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
373 struct page *pg)
374{
375 copy_page(vto, vfrom);
376
377 /*
378 * We should be able to use the following optimisation, however
379 * there are two problems.
380 * Firstly a bug in some versions of binutils meant PLT sections
381 * were not marked executable.
382 * Secondly the first word in the GOT section is blrl, used
383 * to establish the GOT address. Until recently the GOT was
384 * not marked executable.
385 * - Anton
386 */
387#if 0
388 if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
389 return;
390#endif
391
392 flush_dcache_page(pg);
393}
394
395void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
396 unsigned long addr, int len)
397{
398 unsigned long maddr;
399
400 maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
401 flush_icache_range(maddr, maddr + len);
402 kunmap(page);
403}
404EXPORT_SYMBOL(flush_icache_user_range);
405
406/*
407 * System memory should not be in /proc/iomem but various tools expect it
408 * (eg kdump).
409 */
410static int __init add_system_ram_resources(void)
411{
412 struct memblock_region *reg;
413
414 for_each_memblock(memory, reg) {
415 struct resource *res;
416 unsigned long base = reg->base;
417 unsigned long size = reg->size;
418
419 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
420 WARN_ON(!res);
421
422 if (res) {
423 res->name = "System RAM";
424 res->start = base;
425 res->end = base + size - 1;
426 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
427 WARN_ON(request_resource(&iomem_resource, res) < 0);
428 }
429 }
430
431 return 0;
432}
433subsys_initcall(add_system_ram_resources);
434
435#ifdef CONFIG_STRICT_DEVMEM
436/*
437 * devmem_is_allowed(): check to see if /dev/mem access to a certain address
438 * is valid. The argument is a physical page number.
439 *
440 * Access has to be given to non-kernel-ram areas as well, these contain the
441 * PCI mmio resources as well as potential bios/acpi data regions.
442 */
443int devmem_is_allowed(unsigned long pfn)
444{
445 if (page_is_rtas_user_buf(pfn))
446 return 1;
447 if (iomem_is_exclusive(PFN_PHYS(pfn)))
448 return 0;
449 if (!page_is_ram(pfn))
450 return 1;
451 return 0;
452}
453#endif /* CONFIG_STRICT_DEVMEM */
454
455/*
456 * This is defined in kernel/resource.c but only powerpc needs to export it, for
457 * the EHEA driver. Drop this when drivers/net/ethernet/ibm/ehea is removed.
458 */
459EXPORT_SYMBOL_GPL(walk_system_ram_range);
1/*
2 * PowerPC version
3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
4 *
5 * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
6 * and Cort Dougan (PReP) (cort@cs.nmt.edu)
7 * Copyright (C) 1996 Paul Mackerras
8 * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
9 *
10 * Derived from "arch/i386/mm/init.c"
11 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 *
18 */
19
20#include <linux/export.h>
21#include <linux/sched.h>
22#include <linux/kernel.h>
23#include <linux/errno.h>
24#include <linux/string.h>
25#include <linux/gfp.h>
26#include <linux/types.h>
27#include <linux/mm.h>
28#include <linux/stddef.h>
29#include <linux/init.h>
30#include <linux/bootmem.h>
31#include <linux/highmem.h>
32#include <linux/initrd.h>
33#include <linux/pagemap.h>
34#include <linux/suspend.h>
35#include <linux/memblock.h>
36#include <linux/hugetlb.h>
37#include <linux/slab.h>
38
39#include <asm/pgalloc.h>
40#include <asm/prom.h>
41#include <asm/io.h>
42#include <asm/mmu_context.h>
43#include <asm/pgtable.h>
44#include <asm/mmu.h>
45#include <asm/smp.h>
46#include <asm/machdep.h>
47#include <asm/btext.h>
48#include <asm/tlb.h>
49#include <asm/sections.h>
50#include <asm/sparsemem.h>
51#include <asm/vdso.h>
52#include <asm/fixmap.h>
53#include <asm/swiotlb.h>
54#include <asm/rtas.h>
55
56#include "mmu_decl.h"
57
58#ifndef CPU_FTR_COHERENT_ICACHE
59#define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */
60#define CPU_FTR_NOEXECUTE 0
61#endif
62
63int init_bootmem_done;
64int mem_init_done;
65unsigned long long memory_limit;
66
67#ifdef CONFIG_HIGHMEM
68pte_t *kmap_pte;
69EXPORT_SYMBOL(kmap_pte);
70pgprot_t kmap_prot;
71EXPORT_SYMBOL(kmap_prot);
72
73static inline pte_t *virt_to_kpte(unsigned long vaddr)
74{
75 return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
76 vaddr), vaddr), vaddr);
77}
78#endif
79
80int page_is_ram(unsigned long pfn)
81{
82#ifndef CONFIG_PPC64 /* XXX for now */
83 return pfn < max_pfn;
84#else
85 unsigned long paddr = (pfn << PAGE_SHIFT);
86 struct memblock_region *reg;
87
88 for_each_memblock(memory, reg)
89 if (paddr >= reg->base && paddr < (reg->base + reg->size))
90 return 1;
91 return 0;
92#endif
93}
94
95pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
96 unsigned long size, pgprot_t vma_prot)
97{
98 if (ppc_md.phys_mem_access_prot)
99 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
100
101 if (!page_is_ram(pfn))
102 vma_prot = pgprot_noncached(vma_prot);
103
104 return vma_prot;
105}
106EXPORT_SYMBOL(phys_mem_access_prot);
107
108#ifdef CONFIG_MEMORY_HOTPLUG
109
110#ifdef CONFIG_NUMA
111int memory_add_physaddr_to_nid(u64 start)
112{
113 return hot_add_scn_to_nid(start);
114}
115#endif
116
117int arch_add_memory(int nid, u64 start, u64 size)
118{
119 struct pglist_data *pgdata;
120 struct zone *zone;
121 unsigned long start_pfn = start >> PAGE_SHIFT;
122 unsigned long nr_pages = size >> PAGE_SHIFT;
123
124 pgdata = NODE_DATA(nid);
125
126 start = (unsigned long)__va(start);
127 if (create_section_mapping(start, start + size))
128 return -EINVAL;
129
130 /* this should work for most non-highmem platforms */
131 zone = pgdata->node_zones;
132
133 return __add_pages(nid, zone, start_pfn, nr_pages);
134}
135
136#ifdef CONFIG_MEMORY_HOTREMOVE
137int arch_remove_memory(u64 start, u64 size)
138{
139 unsigned long start_pfn = start >> PAGE_SHIFT;
140 unsigned long nr_pages = size >> PAGE_SHIFT;
141 struct zone *zone;
142 int ret;
143
144 zone = page_zone(pfn_to_page(start_pfn));
145 ret = __remove_pages(zone, start_pfn, nr_pages);
146 if (!ret && (ppc_md.remove_memory))
147 ret = ppc_md.remove_memory(start, size);
148
149 return ret;
150}
151#endif
152#endif /* CONFIG_MEMORY_HOTPLUG */
153
154/*
155 * walk_memory_resource() needs to make sure there is no holes in a given
156 * memory range. PPC64 does not maintain the memory layout in /proc/iomem.
157 * Instead it maintains it in memblock.memory structures. Walk through the
158 * memory regions, find holes and callback for contiguous regions.
159 */
160int
161walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
162 void *arg, int (*func)(unsigned long, unsigned long, void *))
163{
164 struct memblock_region *reg;
165 unsigned long end_pfn = start_pfn + nr_pages;
166 unsigned long tstart, tend;
167 int ret = -1;
168
169 for_each_memblock(memory, reg) {
170 tstart = max(start_pfn, memblock_region_memory_base_pfn(reg));
171 tend = min(end_pfn, memblock_region_memory_end_pfn(reg));
172 if (tstart >= tend)
173 continue;
174 ret = (*func)(tstart, tend - tstart, arg);
175 if (ret)
176 break;
177 }
178 return ret;
179}
180EXPORT_SYMBOL_GPL(walk_system_ram_range);
181
182/*
183 * Initialize the bootmem system and give it all the memory we
184 * have available. If we are using highmem, we only put the
185 * lowmem into the bootmem system.
186 */
187#ifndef CONFIG_NEED_MULTIPLE_NODES
188void __init do_init_bootmem(void)
189{
190 unsigned long start, bootmap_pages;
191 unsigned long total_pages;
192 struct memblock_region *reg;
193 int boot_mapsize;
194
195 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
196 total_pages = (memblock_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT;
197#ifdef CONFIG_HIGHMEM
198 total_pages = total_lowmem >> PAGE_SHIFT;
199 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
200#endif
201
202 /*
203 * Find an area to use for the bootmem bitmap. Calculate the size of
204 * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE.
205 * Add 1 additional page in case the address isn't page-aligned.
206 */
207 bootmap_pages = bootmem_bootmap_pages(total_pages);
208
209 start = memblock_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
210
211 min_low_pfn = MEMORY_START >> PAGE_SHIFT;
212 boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn);
213
214 /* Place all memblock_regions in the same node and merge contiguous
215 * memblock_regions
216 */
217 memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0);
218
219 /* Add all physical memory to the bootmem map, mark each area
220 * present.
221 */
222#ifdef CONFIG_HIGHMEM
223 free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT);
224
225 /* reserve the sections we're already using */
226 for_each_memblock(reserved, reg) {
227 unsigned long top = reg->base + reg->size - 1;
228 if (top < lowmem_end_addr)
229 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
230 else if (reg->base < lowmem_end_addr) {
231 unsigned long trunc_size = lowmem_end_addr - reg->base;
232 reserve_bootmem(reg->base, trunc_size, BOOTMEM_DEFAULT);
233 }
234 }
235#else
236 free_bootmem_with_active_regions(0, max_pfn);
237
238 /* reserve the sections we're already using */
239 for_each_memblock(reserved, reg)
240 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
241#endif
242 /* XXX need to clip this if using highmem? */
243 sparse_memory_present_with_active_regions(0);
244
245 init_bootmem_done = 1;
246}
247
248/* mark pages that don't exist as nosave */
249static int __init mark_nonram_nosave(void)
250{
251 struct memblock_region *reg, *prev = NULL;
252
253 for_each_memblock(memory, reg) {
254 if (prev &&
255 memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg))
256 register_nosave_region(memblock_region_memory_end_pfn(prev),
257 memblock_region_memory_base_pfn(reg));
258 prev = reg;
259 }
260 return 0;
261}
262
263/*
264 * paging_init() sets up the page tables - in fact we've already done this.
265 */
266void __init paging_init(void)
267{
268 unsigned long long total_ram = memblock_phys_mem_size();
269 phys_addr_t top_of_ram = memblock_end_of_DRAM();
270 unsigned long max_zone_pfns[MAX_NR_ZONES];
271
272#ifdef CONFIG_PPC32
273 unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1);
274 unsigned long end = __fix_to_virt(FIX_HOLE);
275
276 for (; v < end; v += PAGE_SIZE)
277 map_page(v, 0, 0); /* XXX gross */
278#endif
279
280#ifdef CONFIG_HIGHMEM
281 map_page(PKMAP_BASE, 0, 0); /* XXX gross */
282 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
283
284 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
285 kmap_prot = PAGE_KERNEL;
286#endif /* CONFIG_HIGHMEM */
287
288 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
289 (unsigned long long)top_of_ram, total_ram);
290 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
291 (long int)((top_of_ram - total_ram) >> 20));
292 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
293#ifdef CONFIG_HIGHMEM
294 max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT;
295 max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT;
296#else
297 max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
298#endif
299 free_area_init_nodes(max_zone_pfns);
300
301 mark_nonram_nosave();
302}
303#endif /* ! CONFIG_NEED_MULTIPLE_NODES */
304
305static void __init register_page_bootmem_info(void)
306{
307 int i;
308
309 for_each_online_node(i)
310 register_page_bootmem_info_node(NODE_DATA(i));
311}
312
313void __init mem_init(void)
314{
315 /*
316 * book3s is limited to 16 page sizes due to encoding this in
317 * a 4-bit field for slices.
318 */
319 BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
320
321#ifdef CONFIG_SWIOTLB
322 swiotlb_init(0);
323#endif
324
325 register_page_bootmem_info();
326 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
327 set_max_mapnr(max_pfn);
328 free_all_bootmem();
329
330#ifdef CONFIG_HIGHMEM
331 {
332 unsigned long pfn, highmem_mapnr;
333
334 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
335 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
336 phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
337 struct page *page = pfn_to_page(pfn);
338 if (!memblock_is_reserved(paddr))
339 free_highmem_page(page);
340 }
341 }
342#endif /* CONFIG_HIGHMEM */
343
344#if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP)
345 /*
346 * If smp is enabled, next_tlbcam_idx is initialized in the cpu up
347 * functions.... do it here for the non-smp case.
348 */
349 per_cpu(next_tlbcam_idx, smp_processor_id()) =
350 (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
351#endif
352
353 mem_init_print_info(NULL);
354#ifdef CONFIG_PPC32
355 pr_info("Kernel virtual memory layout:\n");
356 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
357#ifdef CONFIG_HIGHMEM
358 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
359 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
360#endif /* CONFIG_HIGHMEM */
361#ifdef CONFIG_NOT_COHERENT_CACHE
362 pr_info(" * 0x%08lx..0x%08lx : consistent mem\n",
363 IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE);
364#endif /* CONFIG_NOT_COHERENT_CACHE */
365 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
366 ioremap_bot, IOREMAP_TOP);
367 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
368 VMALLOC_START, VMALLOC_END);
369#endif /* CONFIG_PPC32 */
370
371 mem_init_done = 1;
372}
373
374void free_initmem(void)
375{
376 ppc_md.progress = ppc_printk_progress;
377 free_initmem_default(POISON_FREE_INITMEM);
378}
379
380#ifdef CONFIG_BLK_DEV_INITRD
381void __init free_initrd_mem(unsigned long start, unsigned long end)
382{
383 free_reserved_area((void *)start, (void *)end, -1, "initrd");
384}
385#endif
386
387/*
388 * This is called when a page has been modified by the kernel.
389 * It just marks the page as not i-cache clean. We do the i-cache
390 * flush later when the page is given to a user process, if necessary.
391 */
392void flush_dcache_page(struct page *page)
393{
394 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
395 return;
396 /* avoid an atomic op if possible */
397 if (test_bit(PG_arch_1, &page->flags))
398 clear_bit(PG_arch_1, &page->flags);
399}
400EXPORT_SYMBOL(flush_dcache_page);
401
402void flush_dcache_icache_page(struct page *page)
403{
404#ifdef CONFIG_HUGETLB_PAGE
405 if (PageCompound(page)) {
406 flush_dcache_icache_hugepage(page);
407 return;
408 }
409#endif
410#ifdef CONFIG_BOOKE
411 {
412 void *start = kmap_atomic(page);
413 __flush_dcache_icache(start);
414 kunmap_atomic(start);
415 }
416#elif defined(CONFIG_8xx) || defined(CONFIG_PPC64)
417 /* On 8xx there is no need to kmap since highmem is not supported */
418 __flush_dcache_icache(page_address(page));
419#else
420 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
421#endif
422}
423EXPORT_SYMBOL(flush_dcache_icache_page);
424
425void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
426{
427 clear_page(page);
428
429 /*
430 * We shouldn't have to do this, but some versions of glibc
431 * require it (ld.so assumes zero filled pages are icache clean)
432 * - Anton
433 */
434 flush_dcache_page(pg);
435}
436EXPORT_SYMBOL(clear_user_page);
437
438void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
439 struct page *pg)
440{
441 copy_page(vto, vfrom);
442
443 /*
444 * We should be able to use the following optimisation, however
445 * there are two problems.
446 * Firstly a bug in some versions of binutils meant PLT sections
447 * were not marked executable.
448 * Secondly the first word in the GOT section is blrl, used
449 * to establish the GOT address. Until recently the GOT was
450 * not marked executable.
451 * - Anton
452 */
453#if 0
454 if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
455 return;
456#endif
457
458 flush_dcache_page(pg);
459}
460
461void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
462 unsigned long addr, int len)
463{
464 unsigned long maddr;
465
466 maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
467 flush_icache_range(maddr, maddr + len);
468 kunmap(page);
469}
470EXPORT_SYMBOL(flush_icache_user_range);
471
472/*
473 * This is called at the end of handling a user page fault, when the
474 * fault has been handled by updating a PTE in the linux page tables.
475 * We use it to preload an HPTE into the hash table corresponding to
476 * the updated linux PTE.
477 *
478 * This must always be called with the pte lock held.
479 */
480void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
481 pte_t *ptep)
482{
483#ifdef CONFIG_PPC_STD_MMU
484 /*
485 * We don't need to worry about _PAGE_PRESENT here because we are
486 * called with either mm->page_table_lock held or ptl lock held
487 */
488 unsigned long access = 0, trap;
489
490 /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
491 if (!pte_young(*ptep) || address >= TASK_SIZE)
492 return;
493
494 /* We try to figure out if we are coming from an instruction
495 * access fault and pass that down to __hash_page so we avoid
496 * double-faulting on execution of fresh text. We have to test
497 * for regs NULL since init will get here first thing at boot
498 *
499 * We also avoid filling the hash if not coming from a fault
500 */
501 if (current->thread.regs == NULL)
502 return;
503 trap = TRAP(current->thread.regs);
504 if (trap == 0x400)
505 access |= _PAGE_EXEC;
506 else if (trap != 0x300)
507 return;
508 hash_preload(vma->vm_mm, address, access, trap);
509#endif /* CONFIG_PPC_STD_MMU */
510#if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \
511 && defined(CONFIG_HUGETLB_PAGE)
512 if (is_vm_hugetlb_page(vma))
513 book3e_hugetlb_preload(vma, address, *ptep);
514#endif
515}
516
517/*
518 * System memory should not be in /proc/iomem but various tools expect it
519 * (eg kdump).
520 */
521static int __init add_system_ram_resources(void)
522{
523 struct memblock_region *reg;
524
525 for_each_memblock(memory, reg) {
526 struct resource *res;
527 unsigned long base = reg->base;
528 unsigned long size = reg->size;
529
530 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
531 WARN_ON(!res);
532
533 if (res) {
534 res->name = "System RAM";
535 res->start = base;
536 res->end = base + size - 1;
537 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
538 WARN_ON(request_resource(&iomem_resource, res) < 0);
539 }
540 }
541
542 return 0;
543}
544subsys_initcall(add_system_ram_resources);
545
546#ifdef CONFIG_STRICT_DEVMEM
547/*
548 * devmem_is_allowed(): check to see if /dev/mem access to a certain address
549 * is valid. The argument is a physical page number.
550 *
551 * Access has to be given to non-kernel-ram areas as well, these contain the
552 * PCI mmio resources as well as potential bios/acpi data regions.
553 */
554int devmem_is_allowed(unsigned long pfn)
555{
556 if (iomem_is_exclusive(pfn << PAGE_SHIFT))
557 return 0;
558 if (!page_is_ram(pfn))
559 return 1;
560 if (page_is_rtas_user_buf(pfn))
561 return 1;
562 return 0;
563}
564#endif /* CONFIG_STRICT_DEVMEM */