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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/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/module.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
38#include <asm/pgalloc.h>
39#include <asm/prom.h>
40#include <asm/io.h>
41#include <asm/mmu_context.h>
42#include <asm/pgtable.h>
43#include <asm/mmu.h>
44#include <asm/smp.h>
45#include <asm/machdep.h>
46#include <asm/btext.h>
47#include <asm/tlb.h>
48#include <asm/sections.h>
49#include <asm/sparsemem.h>
50#include <asm/vdso.h>
51#include <asm/fixmap.h>
52#include <asm/swiotlb.h>
53
54#include "mmu_decl.h"
55
56#ifndef CPU_FTR_COHERENT_ICACHE
57#define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */
58#define CPU_FTR_NOEXECUTE 0
59#endif
60
61int init_bootmem_done;
62int mem_init_done;
63phys_addr_t memory_limit;
64
65#ifdef CONFIG_HIGHMEM
66pte_t *kmap_pte;
67pgprot_t kmap_prot;
68
69EXPORT_SYMBOL(kmap_prot);
70EXPORT_SYMBOL(kmap_pte);
71
72static inline pte_t *virt_to_kpte(unsigned long vaddr)
73{
74 return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
75 vaddr), vaddr), vaddr);
76}
77#endif
78
79int page_is_ram(unsigned long pfn)
80{
81#ifndef CONFIG_PPC64 /* XXX for now */
82 return pfn < max_pfn;
83#else
84 unsigned long paddr = (pfn << PAGE_SHIFT);
85 struct memblock_region *reg;
86
87 for_each_memblock(memory, reg)
88 if (paddr >= reg->base && paddr < (reg->base + reg->size))
89 return 1;
90 return 0;
91#endif
92}
93
94pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
95 unsigned long size, pgprot_t vma_prot)
96{
97 if (ppc_md.phys_mem_access_prot)
98 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
99
100 if (!page_is_ram(pfn))
101 vma_prot = pgprot_noncached(vma_prot);
102
103 return vma_prot;
104}
105EXPORT_SYMBOL(phys_mem_access_prot);
106
107#ifdef CONFIG_MEMORY_HOTPLUG
108
109#ifdef CONFIG_NUMA
110int memory_add_physaddr_to_nid(u64 start)
111{
112 return hot_add_scn_to_nid(start);
113}
114#endif
115
116int arch_add_memory(int nid, u64 start, u64 size)
117{
118 struct pglist_data *pgdata;
119 struct zone *zone;
120 unsigned long start_pfn = start >> PAGE_SHIFT;
121 unsigned long nr_pages = size >> PAGE_SHIFT;
122
123 pgdata = NODE_DATA(nid);
124
125 start = (unsigned long)__va(start);
126 create_section_mapping(start, start + size);
127
128 /* this should work for most non-highmem platforms */
129 zone = pgdata->node_zones;
130
131 return __add_pages(nid, zone, start_pfn, nr_pages);
132}
133#endif /* CONFIG_MEMORY_HOTPLUG */
134
135/*
136 * walk_memory_resource() needs to make sure there is no holes in a given
137 * memory range. PPC64 does not maintain the memory layout in /proc/iomem.
138 * Instead it maintains it in memblock.memory structures. Walk through the
139 * memory regions, find holes and callback for contiguous regions.
140 */
141int
142walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
143 void *arg, int (*func)(unsigned long, unsigned long, void *))
144{
145 struct memblock_region *reg;
146 unsigned long end_pfn = start_pfn + nr_pages;
147 unsigned long tstart, tend;
148 int ret = -1;
149
150 for_each_memblock(memory, reg) {
151 tstart = max(start_pfn, memblock_region_memory_base_pfn(reg));
152 tend = min(end_pfn, memblock_region_memory_end_pfn(reg));
153 if (tstart >= tend)
154 continue;
155 ret = (*func)(tstart, tend - tstart, arg);
156 if (ret)
157 break;
158 }
159 return ret;
160}
161EXPORT_SYMBOL_GPL(walk_system_ram_range);
162
163/*
164 * Initialize the bootmem system and give it all the memory we
165 * have available. If we are using highmem, we only put the
166 * lowmem into the bootmem system.
167 */
168#ifndef CONFIG_NEED_MULTIPLE_NODES
169void __init do_init_bootmem(void)
170{
171 unsigned long start, bootmap_pages;
172 unsigned long total_pages;
173 struct memblock_region *reg;
174 int boot_mapsize;
175
176 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
177 total_pages = (memblock_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT;
178#ifdef CONFIG_HIGHMEM
179 total_pages = total_lowmem >> PAGE_SHIFT;
180 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
181#endif
182
183 /*
184 * Find an area to use for the bootmem bitmap. Calculate the size of
185 * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE.
186 * Add 1 additional page in case the address isn't page-aligned.
187 */
188 bootmap_pages = bootmem_bootmap_pages(total_pages);
189
190 start = memblock_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
191
192 min_low_pfn = MEMORY_START >> PAGE_SHIFT;
193 boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn);
194
195 /* Add active regions with valid PFNs */
196 for_each_memblock(memory, reg) {
197 unsigned long start_pfn, end_pfn;
198 start_pfn = memblock_region_memory_base_pfn(reg);
199 end_pfn = memblock_region_memory_end_pfn(reg);
200 add_active_range(0, start_pfn, end_pfn);
201 }
202
203 /* Add all physical memory to the bootmem map, mark each area
204 * present.
205 */
206#ifdef CONFIG_HIGHMEM
207 free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT);
208
209 /* reserve the sections we're already using */
210 for_each_memblock(reserved, reg) {
211 unsigned long top = reg->base + reg->size - 1;
212 if (top < lowmem_end_addr)
213 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
214 else if (reg->base < lowmem_end_addr) {
215 unsigned long trunc_size = lowmem_end_addr - reg->base;
216 reserve_bootmem(reg->base, trunc_size, BOOTMEM_DEFAULT);
217 }
218 }
219#else
220 free_bootmem_with_active_regions(0, max_pfn);
221
222 /* reserve the sections we're already using */
223 for_each_memblock(reserved, reg)
224 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
225#endif
226 /* XXX need to clip this if using highmem? */
227 sparse_memory_present_with_active_regions(0);
228
229 init_bootmem_done = 1;
230}
231
232/* mark pages that don't exist as nosave */
233static int __init mark_nonram_nosave(void)
234{
235 struct memblock_region *reg, *prev = NULL;
236
237 for_each_memblock(memory, reg) {
238 if (prev &&
239 memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg))
240 register_nosave_region(memblock_region_memory_end_pfn(prev),
241 memblock_region_memory_base_pfn(reg));
242 prev = reg;
243 }
244 return 0;
245}
246
247/*
248 * paging_init() sets up the page tables - in fact we've already done this.
249 */
250void __init paging_init(void)
251{
252 unsigned long long total_ram = memblock_phys_mem_size();
253 phys_addr_t top_of_ram = memblock_end_of_DRAM();
254 unsigned long max_zone_pfns[MAX_NR_ZONES];
255
256#ifdef CONFIG_PPC32
257 unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1);
258 unsigned long end = __fix_to_virt(FIX_HOLE);
259
260 for (; v < end; v += PAGE_SIZE)
261 map_page(v, 0, 0); /* XXX gross */
262#endif
263
264#ifdef CONFIG_HIGHMEM
265 map_page(PKMAP_BASE, 0, 0); /* XXX gross */
266 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
267
268 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
269 kmap_prot = PAGE_KERNEL;
270#endif /* CONFIG_HIGHMEM */
271
272 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
273 (unsigned long long)top_of_ram, total_ram);
274 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
275 (long int)((top_of_ram - total_ram) >> 20));
276 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
277#ifdef CONFIG_HIGHMEM
278 max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT;
279 max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT;
280#else
281 max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
282#endif
283 free_area_init_nodes(max_zone_pfns);
284
285 mark_nonram_nosave();
286}
287#endif /* ! CONFIG_NEED_MULTIPLE_NODES */
288
289void __init mem_init(void)
290{
291#ifdef CONFIG_NEED_MULTIPLE_NODES
292 int nid;
293#endif
294 pg_data_t *pgdat;
295 unsigned long i;
296 struct page *page;
297 unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
298
299#ifdef CONFIG_SWIOTLB
300 if (ppc_swiotlb_enable)
301 swiotlb_init(1);
302#endif
303
304 num_physpages = memblock_phys_mem_size() >> PAGE_SHIFT;
305 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
306
307#ifdef CONFIG_NEED_MULTIPLE_NODES
308 for_each_online_node(nid) {
309 if (NODE_DATA(nid)->node_spanned_pages != 0) {
310 printk("freeing bootmem node %d\n", nid);
311 totalram_pages +=
312 free_all_bootmem_node(NODE_DATA(nid));
313 }
314 }
315#else
316 max_mapnr = max_pfn;
317 totalram_pages += free_all_bootmem();
318#endif
319 for_each_online_pgdat(pgdat) {
320 for (i = 0; i < pgdat->node_spanned_pages; i++) {
321 if (!pfn_valid(pgdat->node_start_pfn + i))
322 continue;
323 page = pgdat_page_nr(pgdat, i);
324 if (PageReserved(page))
325 reservedpages++;
326 }
327 }
328
329 codesize = (unsigned long)&_sdata - (unsigned long)&_stext;
330 datasize = (unsigned long)&_edata - (unsigned long)&_sdata;
331 initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
332 bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start;
333
334#ifdef CONFIG_HIGHMEM
335 {
336 unsigned long pfn, highmem_mapnr;
337
338 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
339 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
340 phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
341 struct page *page = pfn_to_page(pfn);
342 if (memblock_is_reserved(paddr))
343 continue;
344 ClearPageReserved(page);
345 init_page_count(page);
346 __free_page(page);
347 totalhigh_pages++;
348 reservedpages--;
349 }
350 totalram_pages += totalhigh_pages;
351 printk(KERN_DEBUG "High memory: %luk\n",
352 totalhigh_pages << (PAGE_SHIFT-10));
353 }
354#endif /* CONFIG_HIGHMEM */
355
356#if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP)
357 /*
358 * If smp is enabled, next_tlbcam_idx is initialized in the cpu up
359 * functions.... do it here for the non-smp case.
360 */
361 per_cpu(next_tlbcam_idx, smp_processor_id()) =
362 (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
363#endif
364
365 printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, "
366 "%luk reserved, %luk data, %luk bss, %luk init)\n",
367 nr_free_pages() << (PAGE_SHIFT-10),
368 num_physpages << (PAGE_SHIFT-10),
369 codesize >> 10,
370 reservedpages << (PAGE_SHIFT-10),
371 datasize >> 10,
372 bsssize >> 10,
373 initsize >> 10);
374
375#ifdef CONFIG_PPC32
376 pr_info("Kernel virtual memory layout:\n");
377 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
378#ifdef CONFIG_HIGHMEM
379 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
380 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
381#endif /* CONFIG_HIGHMEM */
382#ifdef CONFIG_NOT_COHERENT_CACHE
383 pr_info(" * 0x%08lx..0x%08lx : consistent mem\n",
384 IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE);
385#endif /* CONFIG_NOT_COHERENT_CACHE */
386 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
387 ioremap_bot, IOREMAP_TOP);
388 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
389 VMALLOC_START, VMALLOC_END);
390#endif /* CONFIG_PPC32 */
391
392 mem_init_done = 1;
393}
394
395void free_initmem(void)
396{
397 unsigned long addr;
398
399 ppc_md.progress = ppc_printk_progress;
400
401 addr = (unsigned long)__init_begin;
402 for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
403 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
404 ClearPageReserved(virt_to_page(addr));
405 init_page_count(virt_to_page(addr));
406 free_page(addr);
407 totalram_pages++;
408 }
409 pr_info("Freeing unused kernel memory: %luk freed\n",
410 ((unsigned long)__init_end -
411 (unsigned long)__init_begin) >> 10);
412}
413
414#ifdef CONFIG_BLK_DEV_INITRD
415void __init free_initrd_mem(unsigned long start, unsigned long end)
416{
417 if (start >= end)
418 return;
419
420 start = _ALIGN_DOWN(start, PAGE_SIZE);
421 end = _ALIGN_UP(end, PAGE_SIZE);
422 pr_info("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
423
424 for (; start < end; start += PAGE_SIZE) {
425 ClearPageReserved(virt_to_page(start));
426 init_page_count(virt_to_page(start));
427 free_page(start);
428 totalram_pages++;
429 }
430}
431#endif
432
433/*
434 * This is called when a page has been modified by the kernel.
435 * It just marks the page as not i-cache clean. We do the i-cache
436 * flush later when the page is given to a user process, if necessary.
437 */
438void flush_dcache_page(struct page *page)
439{
440 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
441 return;
442 /* avoid an atomic op if possible */
443 if (test_bit(PG_arch_1, &page->flags))
444 clear_bit(PG_arch_1, &page->flags);
445}
446EXPORT_SYMBOL(flush_dcache_page);
447
448void flush_dcache_icache_page(struct page *page)
449{
450#ifdef CONFIG_HUGETLB_PAGE
451 if (PageCompound(page)) {
452 flush_dcache_icache_hugepage(page);
453 return;
454 }
455#endif
456#ifdef CONFIG_BOOKE
457 {
458 void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE);
459 __flush_dcache_icache(start);
460 kunmap_atomic(start, KM_PPC_SYNC_ICACHE);
461 }
462#elif defined(CONFIG_8xx) || defined(CONFIG_PPC64)
463 /* On 8xx there is no need to kmap since highmem is not supported */
464 __flush_dcache_icache(page_address(page));
465#else
466 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
467#endif
468}
469
470void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
471{
472 clear_page(page);
473
474 /*
475 * We shouldn't have to do this, but some versions of glibc
476 * require it (ld.so assumes zero filled pages are icache clean)
477 * - Anton
478 */
479 flush_dcache_page(pg);
480}
481EXPORT_SYMBOL(clear_user_page);
482
483void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
484 struct page *pg)
485{
486 copy_page(vto, vfrom);
487
488 /*
489 * We should be able to use the following optimisation, however
490 * there are two problems.
491 * Firstly a bug in some versions of binutils meant PLT sections
492 * were not marked executable.
493 * Secondly the first word in the GOT section is blrl, used
494 * to establish the GOT address. Until recently the GOT was
495 * not marked executable.
496 * - Anton
497 */
498#if 0
499 if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
500 return;
501#endif
502
503 flush_dcache_page(pg);
504}
505
506void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
507 unsigned long addr, int len)
508{
509 unsigned long maddr;
510
511 maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
512 flush_icache_range(maddr, maddr + len);
513 kunmap(page);
514}
515EXPORT_SYMBOL(flush_icache_user_range);
516
517/*
518 * This is called at the end of handling a user page fault, when the
519 * fault has been handled by updating a PTE in the linux page tables.
520 * We use it to preload an HPTE into the hash table corresponding to
521 * the updated linux PTE.
522 *
523 * This must always be called with the pte lock held.
524 */
525void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
526 pte_t *ptep)
527{
528#ifdef CONFIG_PPC_STD_MMU
529 unsigned long access = 0, trap;
530
531 /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
532 if (!pte_young(*ptep) || address >= TASK_SIZE)
533 return;
534
535 /* We try to figure out if we are coming from an instruction
536 * access fault and pass that down to __hash_page so we avoid
537 * double-faulting on execution of fresh text. We have to test
538 * for regs NULL since init will get here first thing at boot
539 *
540 * We also avoid filling the hash if not coming from a fault
541 */
542 if (current->thread.regs == NULL)
543 return;
544 trap = TRAP(current->thread.regs);
545 if (trap == 0x400)
546 access |= _PAGE_EXEC;
547 else if (trap != 0x300)
548 return;
549 hash_preload(vma->vm_mm, address, access, trap);
550#endif /* CONFIG_PPC_STD_MMU */
551}