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#include <linux/vmalloc.h>
39
40#include <asm/pgalloc.h>
41#include <asm/prom.h>
42#include <asm/io.h>
43#include <asm/mmu_context.h>
44#include <asm/pgtable.h>
45#include <asm/mmu.h>
46#include <asm/smp.h>
47#include <asm/machdep.h>
48#include <asm/btext.h>
49#include <asm/tlb.h>
50#include <asm/sections.h>
51#include <asm/sparsemem.h>
52#include <asm/vdso.h>
53#include <asm/fixmap.h>
54#include <asm/swiotlb.h>
55#include <asm/rtas.h>
56
57#include "mmu_decl.h"
58
59#ifndef CPU_FTR_COHERENT_ICACHE
60#define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */
61#define CPU_FTR_NOEXECUTE 0
62#endif
63
64unsigned long long memory_limit;
65
66#ifdef CONFIG_HIGHMEM
67pte_t *kmap_pte;
68EXPORT_SYMBOL(kmap_pte);
69pgprot_t kmap_prot;
70EXPORT_SYMBOL(kmap_prot);
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, bool for_device)
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 int rc;
123
124 pgdata = NODE_DATA(nid);
125
126 start = (unsigned long)__va(start);
127 rc = create_section_mapping(start, start + size);
128 if (rc) {
129 pr_warning(
130 "Unable to create mapping for hot added memory 0x%llx..0x%llx: %d\n",
131 start, start + size, rc);
132 return -EFAULT;
133 }
134
135 /* this should work for most non-highmem platforms */
136 zone = pgdata->node_zones +
137 zone_for_memory(nid, start, size, 0, for_device);
138
139 return __add_pages(nid, zone, start_pfn, nr_pages);
140}
141
142#ifdef CONFIG_MEMORY_HOTREMOVE
143int arch_remove_memory(u64 start, u64 size)
144{
145 unsigned long start_pfn = start >> PAGE_SHIFT;
146 unsigned long nr_pages = size >> PAGE_SHIFT;
147 struct zone *zone;
148 int ret;
149
150 zone = page_zone(pfn_to_page(start_pfn));
151 ret = __remove_pages(zone, start_pfn, nr_pages);
152 if (ret)
153 return ret;
154
155 /* Remove htab bolted mappings for this section of memory */
156 start = (unsigned long)__va(start);
157 ret = remove_section_mapping(start, start + size);
158
159 /* Ensure all vmalloc mappings are flushed in case they also
160 * hit that section of memory
161 */
162 vm_unmap_aliases();
163
164 return ret;
165}
166#endif
167#endif /* CONFIG_MEMORY_HOTPLUG */
168
169/*
170 * walk_memory_resource() needs to make sure there is no holes in a given
171 * memory range. PPC64 does not maintain the memory layout in /proc/iomem.
172 * Instead it maintains it in memblock.memory structures. Walk through the
173 * memory regions, find holes and callback for contiguous regions.
174 */
175int
176walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
177 void *arg, int (*func)(unsigned long, unsigned long, void *))
178{
179 struct memblock_region *reg;
180 unsigned long end_pfn = start_pfn + nr_pages;
181 unsigned long tstart, tend;
182 int ret = -1;
183
184 for_each_memblock(memory, reg) {
185 tstart = max(start_pfn, memblock_region_memory_base_pfn(reg));
186 tend = min(end_pfn, memblock_region_memory_end_pfn(reg));
187 if (tstart >= tend)
188 continue;
189 ret = (*func)(tstart, tend - tstart, arg);
190 if (ret)
191 break;
192 }
193 return ret;
194}
195EXPORT_SYMBOL_GPL(walk_system_ram_range);
196
197#ifndef CONFIG_NEED_MULTIPLE_NODES
198void __init initmem_init(void)
199{
200 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
201 min_low_pfn = MEMORY_START >> PAGE_SHIFT;
202#ifdef CONFIG_HIGHMEM
203 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
204#endif
205
206 /* Place all memblock_regions in the same node and merge contiguous
207 * memblock_regions
208 */
209 memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0);
210
211 /* XXX need to clip this if using highmem? */
212 sparse_memory_present_with_active_regions(0);
213 sparse_init();
214}
215
216/* mark pages that don't exist as nosave */
217static int __init mark_nonram_nosave(void)
218{
219 struct memblock_region *reg, *prev = NULL;
220
221 for_each_memblock(memory, reg) {
222 if (prev &&
223 memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg))
224 register_nosave_region(memblock_region_memory_end_pfn(prev),
225 memblock_region_memory_base_pfn(reg));
226 prev = reg;
227 }
228 return 0;
229}
230#else /* CONFIG_NEED_MULTIPLE_NODES */
231static int __init mark_nonram_nosave(void)
232{
233 return 0;
234}
235#endif
236
237static bool zone_limits_final;
238
239static unsigned long max_zone_pfns[MAX_NR_ZONES] = {
240 [0 ... MAX_NR_ZONES - 1] = ~0UL
241};
242
243/*
244 * Restrict the specified zone and all more restrictive zones
245 * to be below the specified pfn. May not be called after
246 * paging_init().
247 */
248void __init limit_zone_pfn(enum zone_type zone, unsigned long pfn_limit)
249{
250 int i;
251
252 if (WARN_ON(zone_limits_final))
253 return;
254
255 for (i = zone; i >= 0; i--) {
256 if (max_zone_pfns[i] > pfn_limit)
257 max_zone_pfns[i] = pfn_limit;
258 }
259}
260
261/*
262 * Find the least restrictive zone that is entirely below the
263 * specified pfn limit. Returns < 0 if no suitable zone is found.
264 *
265 * pfn_limit must be u64 because it can exceed 32 bits even on 32-bit
266 * systems -- the DMA limit can be higher than any possible real pfn.
267 */
268int dma_pfn_limit_to_zone(u64 pfn_limit)
269{
270 enum zone_type top_zone = ZONE_NORMAL;
271 int i;
272
273#ifdef CONFIG_HIGHMEM
274 top_zone = ZONE_HIGHMEM;
275#endif
276
277 for (i = top_zone; i >= 0; i--) {
278 if (max_zone_pfns[i] <= pfn_limit)
279 return i;
280 }
281
282 return -EPERM;
283}
284
285/*
286 * paging_init() sets up the page tables - in fact we've already done this.
287 */
288void __init paging_init(void)
289{
290 unsigned long long total_ram = memblock_phys_mem_size();
291 phys_addr_t top_of_ram = memblock_end_of_DRAM();
292 enum zone_type top_zone;
293
294#ifdef CONFIG_PPC32
295 unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1);
296 unsigned long end = __fix_to_virt(FIX_HOLE);
297
298 for (; v < end; v += PAGE_SIZE)
299 map_page(v, 0, 0); /* XXX gross */
300#endif
301
302#ifdef CONFIG_HIGHMEM
303 map_page(PKMAP_BASE, 0, 0); /* XXX gross */
304 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
305
306 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
307 kmap_prot = PAGE_KERNEL;
308#endif /* CONFIG_HIGHMEM */
309
310 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
311 (unsigned long long)top_of_ram, total_ram);
312 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
313 (long int)((top_of_ram - total_ram) >> 20));
314
315#ifdef CONFIG_HIGHMEM
316 top_zone = ZONE_HIGHMEM;
317 limit_zone_pfn(ZONE_NORMAL, lowmem_end_addr >> PAGE_SHIFT);
318#else
319 top_zone = ZONE_NORMAL;
320#endif
321
322 limit_zone_pfn(top_zone, top_of_ram >> PAGE_SHIFT);
323 zone_limits_final = true;
324 free_area_init_nodes(max_zone_pfns);
325
326 mark_nonram_nosave();
327}
328
329void __init mem_init(void)
330{
331 /*
332 * book3s is limited to 16 page sizes due to encoding this in
333 * a 4-bit field for slices.
334 */
335 BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
336
337#ifdef CONFIG_SWIOTLB
338 swiotlb_init(0);
339#endif
340
341 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
342 set_max_mapnr(max_pfn);
343 free_all_bootmem();
344
345#ifdef CONFIG_HIGHMEM
346 {
347 unsigned long pfn, highmem_mapnr;
348
349 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
350 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
351 phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
352 struct page *page = pfn_to_page(pfn);
353 if (!memblock_is_reserved(paddr))
354 free_highmem_page(page);
355 }
356 }
357#endif /* CONFIG_HIGHMEM */
358
359#if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP)
360 /*
361 * If smp is enabled, next_tlbcam_idx is initialized in the cpu up
362 * functions.... do it here for the non-smp case.
363 */
364 per_cpu(next_tlbcam_idx, smp_processor_id()) =
365 (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
366#endif
367
368 mem_init_print_info(NULL);
369#ifdef CONFIG_PPC32
370 pr_info("Kernel virtual memory layout:\n");
371 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
372#ifdef CONFIG_HIGHMEM
373 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
374 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
375#endif /* CONFIG_HIGHMEM */
376#ifdef CONFIG_NOT_COHERENT_CACHE
377 pr_info(" * 0x%08lx..0x%08lx : consistent mem\n",
378 IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE);
379#endif /* CONFIG_NOT_COHERENT_CACHE */
380 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
381 ioremap_bot, IOREMAP_TOP);
382 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
383 VMALLOC_START, VMALLOC_END);
384#endif /* CONFIG_PPC32 */
385}
386
387void free_initmem(void)
388{
389 ppc_md.progress = ppc_printk_progress;
390 free_initmem_default(POISON_FREE_INITMEM);
391}
392
393#ifdef CONFIG_BLK_DEV_INITRD
394void __init free_initrd_mem(unsigned long start, unsigned long end)
395{
396 free_reserved_area((void *)start, (void *)end, -1, "initrd");
397}
398#endif
399
400/*
401 * This is called when a page has been modified by the kernel.
402 * It just marks the page as not i-cache clean. We do the i-cache
403 * flush later when the page is given to a user process, if necessary.
404 */
405void flush_dcache_page(struct page *page)
406{
407 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
408 return;
409 /* avoid an atomic op if possible */
410 if (test_bit(PG_arch_1, &page->flags))
411 clear_bit(PG_arch_1, &page->flags);
412}
413EXPORT_SYMBOL(flush_dcache_page);
414
415void flush_dcache_icache_page(struct page *page)
416{
417#ifdef CONFIG_HUGETLB_PAGE
418 if (PageCompound(page)) {
419 flush_dcache_icache_hugepage(page);
420 return;
421 }
422#endif
423#if defined(CONFIG_8xx) || defined(CONFIG_PPC64)
424 /* On 8xx there is no need to kmap since highmem is not supported */
425 __flush_dcache_icache(page_address(page));
426#else
427 if (IS_ENABLED(CONFIG_BOOKE) || sizeof(phys_addr_t) > sizeof(void *)) {
428 void *start = kmap_atomic(page);
429 __flush_dcache_icache(start);
430 kunmap_atomic(start);
431 } else {
432 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
433 }
434#endif
435}
436EXPORT_SYMBOL(flush_dcache_icache_page);
437
438void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
439{
440 clear_page(page);
441
442 /*
443 * We shouldn't have to do this, but some versions of glibc
444 * require it (ld.so assumes zero filled pages are icache clean)
445 * - Anton
446 */
447 flush_dcache_page(pg);
448}
449EXPORT_SYMBOL(clear_user_page);
450
451void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
452 struct page *pg)
453{
454 copy_page(vto, vfrom);
455
456 /*
457 * We should be able to use the following optimisation, however
458 * there are two problems.
459 * Firstly a bug in some versions of binutils meant PLT sections
460 * were not marked executable.
461 * Secondly the first word in the GOT section is blrl, used
462 * to establish the GOT address. Until recently the GOT was
463 * not marked executable.
464 * - Anton
465 */
466#if 0
467 if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
468 return;
469#endif
470
471 flush_dcache_page(pg);
472}
473
474void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
475 unsigned long addr, int len)
476{
477 unsigned long maddr;
478
479 maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
480 flush_icache_range(maddr, maddr + len);
481 kunmap(page);
482}
483EXPORT_SYMBOL(flush_icache_user_range);
484
485/*
486 * This is called at the end of handling a user page fault, when the
487 * fault has been handled by updating a PTE in the linux page tables.
488 * We use it to preload an HPTE into the hash table corresponding to
489 * the updated linux PTE.
490 *
491 * This must always be called with the pte lock held.
492 */
493void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
494 pte_t *ptep)
495{
496#ifdef CONFIG_PPC_STD_MMU
497 /*
498 * We don't need to worry about _PAGE_PRESENT here because we are
499 * called with either mm->page_table_lock held or ptl lock held
500 */
501 unsigned long access = 0, trap;
502
503 /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
504 if (!pte_young(*ptep) || address >= TASK_SIZE)
505 return;
506
507 /* We try to figure out if we are coming from an instruction
508 * access fault and pass that down to __hash_page so we avoid
509 * double-faulting on execution of fresh text. We have to test
510 * for regs NULL since init will get here first thing at boot
511 *
512 * We also avoid filling the hash if not coming from a fault
513 */
514 if (current->thread.regs == NULL)
515 return;
516 trap = TRAP(current->thread.regs);
517 if (trap == 0x400)
518 access |= _PAGE_EXEC;
519 else if (trap != 0x300)
520 return;
521 hash_preload(vma->vm_mm, address, access, trap);
522#endif /* CONFIG_PPC_STD_MMU */
523#if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \
524 && defined(CONFIG_HUGETLB_PAGE)
525 if (is_vm_hugetlb_page(vma))
526 book3e_hugetlb_preload(vma, address, *ptep);
527#endif
528}
529
530/*
531 * System memory should not be in /proc/iomem but various tools expect it
532 * (eg kdump).
533 */
534static int __init add_system_ram_resources(void)
535{
536 struct memblock_region *reg;
537
538 for_each_memblock(memory, reg) {
539 struct resource *res;
540 unsigned long base = reg->base;
541 unsigned long size = reg->size;
542
543 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
544 WARN_ON(!res);
545
546 if (res) {
547 res->name = "System RAM";
548 res->start = base;
549 res->end = base + size - 1;
550 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
551 WARN_ON(request_resource(&iomem_resource, res) < 0);
552 }
553 }
554
555 return 0;
556}
557subsys_initcall(add_system_ram_resources);
558
559#ifdef CONFIG_STRICT_DEVMEM
560/*
561 * devmem_is_allowed(): check to see if /dev/mem access to a certain address
562 * is valid. The argument is a physical page number.
563 *
564 * Access has to be given to non-kernel-ram areas as well, these contain the
565 * PCI mmio resources as well as potential bios/acpi data regions.
566 */
567int devmem_is_allowed(unsigned long pfn)
568{
569 if (page_is_rtas_user_buf(pfn))
570 return 1;
571 if (iomem_is_exclusive(PFN_PHYS(pfn)))
572 return 0;
573 if (!page_is_ram(pfn))
574 return 1;
575 return 0;
576}
577#endif /* CONFIG_STRICT_DEVMEM */