Loading...
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/memblock.h>
16#include <linux/highmem.h>
17#include <linux/suspend.h>
18#include <linux/dma-direct.h>
19
20#include <asm/swiotlb.h>
21#include <asm/machdep.h>
22#include <asm/rtas.h>
23#include <asm/kasan.h>
24#include <asm/svm.h>
25#include <asm/mmzone.h>
26#include <asm/ftrace.h>
27#include <asm/code-patching.h>
28#include <asm/setup.h>
29
30#include <mm/mmu_decl.h>
31
32unsigned long long memory_limit;
33
34unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
35EXPORT_SYMBOL(empty_zero_page);
36
37pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
38 unsigned long size, pgprot_t vma_prot)
39{
40 if (ppc_md.phys_mem_access_prot)
41 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
42
43 if (!page_is_ram(pfn))
44 vma_prot = pgprot_noncached(vma_prot);
45
46 return vma_prot;
47}
48EXPORT_SYMBOL(phys_mem_access_prot);
49
50#ifdef CONFIG_MEMORY_HOTPLUG
51static DEFINE_MUTEX(linear_mapping_mutex);
52
53#ifdef CONFIG_NUMA
54int memory_add_physaddr_to_nid(u64 start)
55{
56 return hot_add_scn_to_nid(start);
57}
58EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
59#endif
60
61int __weak create_section_mapping(unsigned long start, unsigned long end,
62 int nid, pgprot_t prot)
63{
64 return -ENODEV;
65}
66
67int __weak remove_section_mapping(unsigned long start, unsigned long end)
68{
69 return -ENODEV;
70}
71
72int __ref arch_create_linear_mapping(int nid, u64 start, u64 size,
73 struct mhp_params *params)
74{
75 int rc;
76
77 start = (unsigned long)__va(start);
78 mutex_lock(&linear_mapping_mutex);
79 rc = create_section_mapping(start, start + size, nid,
80 params->pgprot);
81 mutex_unlock(&linear_mapping_mutex);
82 if (rc) {
83 pr_warn("Unable to create linear mapping for 0x%llx..0x%llx: %d\n",
84 start, start + size, rc);
85 return -EFAULT;
86 }
87 return 0;
88}
89
90void __ref arch_remove_linear_mapping(u64 start, u64 size)
91{
92 int ret;
93
94 /* Remove htab bolted mappings for this section of memory */
95 start = (unsigned long)__va(start);
96
97 mutex_lock(&linear_mapping_mutex);
98 ret = remove_section_mapping(start, start + size);
99 mutex_unlock(&linear_mapping_mutex);
100 if (ret)
101 pr_warn("Unable to remove linear mapping for 0x%llx..0x%llx: %d\n",
102 start, start + size, ret);
103
104 /* Ensure all vmalloc mappings are flushed in case they also
105 * hit that section of memory
106 */
107 vm_unmap_aliases();
108}
109
110/*
111 * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need
112 * updating.
113 */
114static void update_end_of_memory_vars(u64 start, u64 size)
115{
116 unsigned long end_pfn = PFN_UP(start + size);
117
118 if (end_pfn > max_pfn) {
119 max_pfn = end_pfn;
120 max_low_pfn = end_pfn;
121 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
122 }
123}
124
125int __ref add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
126 struct mhp_params *params)
127{
128 int ret;
129
130 ret = __add_pages(nid, start_pfn, nr_pages, params);
131 if (ret)
132 return ret;
133
134 /* update max_pfn, max_low_pfn and high_memory */
135 update_end_of_memory_vars(start_pfn << PAGE_SHIFT,
136 nr_pages << PAGE_SHIFT);
137
138 return ret;
139}
140
141int __ref arch_add_memory(int nid, u64 start, u64 size,
142 struct mhp_params *params)
143{
144 unsigned long start_pfn = start >> PAGE_SHIFT;
145 unsigned long nr_pages = size >> PAGE_SHIFT;
146 int rc;
147
148 rc = arch_create_linear_mapping(nid, start, size, params);
149 if (rc)
150 return rc;
151 rc = add_pages(nid, start_pfn, nr_pages, params);
152 if (rc)
153 arch_remove_linear_mapping(start, size);
154 return rc;
155}
156
157void __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
158{
159 unsigned long start_pfn = start >> PAGE_SHIFT;
160 unsigned long nr_pages = size >> PAGE_SHIFT;
161
162 __remove_pages(start_pfn, nr_pages, altmap);
163 arch_remove_linear_mapping(start, size);
164}
165#endif
166
167#ifndef CONFIG_NUMA
168void __init mem_topology_setup(void)
169{
170 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
171 min_low_pfn = MEMORY_START >> PAGE_SHIFT;
172#ifdef CONFIG_HIGHMEM
173 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
174#endif
175
176 /* Place all memblock_regions in the same node and merge contiguous
177 * memblock_regions
178 */
179 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
180}
181
182void __init initmem_init(void)
183{
184 sparse_init();
185}
186
187/* mark pages that don't exist as nosave */
188static int __init mark_nonram_nosave(void)
189{
190 unsigned long spfn, epfn, prev = 0;
191 int i;
192
193 for_each_mem_pfn_range(i, MAX_NUMNODES, &spfn, &epfn, NULL) {
194 if (prev && prev < spfn)
195 register_nosave_region(prev, spfn);
196
197 prev = epfn;
198 }
199
200 return 0;
201}
202#else /* CONFIG_NUMA */
203static int __init mark_nonram_nosave(void)
204{
205 return 0;
206}
207#endif
208
209/*
210 * Zones usage:
211 *
212 * We setup ZONE_DMA to be 31-bits on all platforms and ZONE_NORMAL to be
213 * everything else. GFP_DMA32 page allocations automatically fall back to
214 * ZONE_DMA.
215 *
216 * By using 31-bit unconditionally, we can exploit zone_dma_bits to inform the
217 * generic DMA mapping code. 32-bit only devices (if not handled by an IOMMU
218 * anyway) will take a first dip into ZONE_NORMAL and get otherwise served by
219 * ZONE_DMA.
220 */
221static unsigned long max_zone_pfns[MAX_NR_ZONES];
222
223/*
224 * paging_init() sets up the page tables - in fact we've already done this.
225 */
226void __init paging_init(void)
227{
228 unsigned long long total_ram = memblock_phys_mem_size();
229 phys_addr_t top_of_ram = memblock_end_of_DRAM();
230
231#ifdef CONFIG_HIGHMEM
232 unsigned long v = __fix_to_virt(FIX_KMAP_END);
233 unsigned long end = __fix_to_virt(FIX_KMAP_BEGIN);
234
235 for (; v < end; v += PAGE_SIZE)
236 map_kernel_page(v, 0, __pgprot(0)); /* XXX gross */
237
238 map_kernel_page(PKMAP_BASE, 0, __pgprot(0)); /* XXX gross */
239 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
240#endif /* CONFIG_HIGHMEM */
241
242 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
243 (unsigned long long)top_of_ram, total_ram);
244 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
245 (long int)((top_of_ram - total_ram) >> 20));
246
247 /*
248 * Allow 30-bit DMA for very limited Broadcom wifi chips on many
249 * powerbooks.
250 */
251 if (IS_ENABLED(CONFIG_PPC32))
252 zone_dma_bits = 30;
253 else
254 zone_dma_bits = 31;
255
256#ifdef CONFIG_ZONE_DMA
257 max_zone_pfns[ZONE_DMA] = min(max_low_pfn,
258 1UL << (zone_dma_bits - PAGE_SHIFT));
259#endif
260 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
261#ifdef CONFIG_HIGHMEM
262 max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
263#endif
264
265 free_area_init(max_zone_pfns);
266
267 mark_nonram_nosave();
268}
269
270void __init mem_init(void)
271{
272 /*
273 * book3s is limited to 16 page sizes due to encoding this in
274 * a 4-bit field for slices.
275 */
276 BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
277
278#ifdef CONFIG_SWIOTLB
279 /*
280 * Some platforms (e.g. 85xx) limit DMA-able memory way below
281 * 4G. We force memblock to bottom-up mode to ensure that the
282 * memory allocated in swiotlb_init() is DMA-able.
283 * As it's the last memblock allocation, no need to reset it
284 * back to to-down.
285 */
286 memblock_set_bottom_up(true);
287 swiotlb_init(ppc_swiotlb_enable, ppc_swiotlb_flags);
288#endif
289
290 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
291 set_max_mapnr(max_pfn);
292
293 kasan_late_init();
294
295 memblock_free_all();
296
297#ifdef CONFIG_HIGHMEM
298 {
299 unsigned long pfn, highmem_mapnr;
300
301 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
302 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
303 phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
304 struct page *page = pfn_to_page(pfn);
305 if (memblock_is_memory(paddr) && !memblock_is_reserved(paddr))
306 free_highmem_page(page);
307 }
308 }
309#endif /* CONFIG_HIGHMEM */
310
311#if defined(CONFIG_PPC_E500) && !defined(CONFIG_SMP)
312 /*
313 * If smp is enabled, next_tlbcam_idx is initialized in the cpu up
314 * functions.... do it here for the non-smp case.
315 */
316 per_cpu(next_tlbcam_idx, smp_processor_id()) =
317 (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
318#endif
319
320#ifdef CONFIG_PPC32
321 pr_info("Kernel virtual memory layout:\n");
322#ifdef CONFIG_KASAN
323 pr_info(" * 0x%08lx..0x%08lx : kasan shadow mem\n",
324 KASAN_SHADOW_START, KASAN_SHADOW_END);
325#endif
326 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
327#ifdef CONFIG_HIGHMEM
328 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
329 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
330#endif /* CONFIG_HIGHMEM */
331 if (ioremap_bot != IOREMAP_TOP)
332 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
333 ioremap_bot, IOREMAP_TOP);
334 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
335 VMALLOC_START, VMALLOC_END);
336#ifdef MODULES_VADDR
337 pr_info(" * 0x%08lx..0x%08lx : modules\n",
338 MODULES_VADDR, MODULES_END);
339#endif
340#endif /* CONFIG_PPC32 */
341}
342
343void free_initmem(void)
344{
345 ppc_md.progress = ppc_printk_progress;
346 mark_initmem_nx();
347 free_initmem_default(POISON_FREE_INITMEM);
348 ftrace_free_init_tramp();
349}
350
351/*
352 * System memory should not be in /proc/iomem but various tools expect it
353 * (eg kdump).
354 */
355static int __init add_system_ram_resources(void)
356{
357 phys_addr_t start, end;
358 u64 i;
359
360 for_each_mem_range(i, &start, &end) {
361 struct resource *res;
362
363 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
364 WARN_ON(!res);
365
366 if (res) {
367 res->name = "System RAM";
368 res->start = start;
369 /*
370 * In memblock, end points to the first byte after
371 * the range while in resourses, end points to the
372 * last byte in the range.
373 */
374 res->end = end - 1;
375 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
376 WARN_ON(request_resource(&iomem_resource, res) < 0);
377 }
378 }
379
380 return 0;
381}
382subsys_initcall(add_system_ram_resources);
383
384#ifdef CONFIG_STRICT_DEVMEM
385/*
386 * devmem_is_allowed(): check to see if /dev/mem access to a certain address
387 * is valid. The argument is a physical page number.
388 *
389 * Access has to be given to non-kernel-ram areas as well, these contain the
390 * PCI mmio resources as well as potential bios/acpi data regions.
391 */
392int devmem_is_allowed(unsigned long pfn)
393{
394 if (page_is_rtas_user_buf(pfn))
395 return 1;
396 if (iomem_is_exclusive(PFN_PHYS(pfn)))
397 return 0;
398 if (!page_is_ram(pfn))
399 return 1;
400 return 0;
401}
402#endif /* CONFIG_STRICT_DEVMEM */
403
404/*
405 * This is defined in kernel/resource.c but only powerpc needs to export it, for
406 * the EHEA driver. Drop this when drivers/net/ethernet/ibm/ehea is removed.
407 */
408EXPORT_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 */