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Paul Mackerras14cf11a2005-09-26 16:04:21 +10001/*
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
Paul Mackerras14cf11a2005-09-26 16:04:21 +10008 * 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
Paul Gortmaker4b16f8e2011-07-22 18:24:23 -040020#include <linux/export.h>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100021#include <linux/sched.h>
22#include <linux/kernel.h>
23#include <linux/errno.h>
24#include <linux/string.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090025#include <linux/gfp.h>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100026#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>
Johannes Berg4e8ad3e2007-05-08 19:25:00 +100034#include <linux/suspend.h>
Yinghai Lu95f72d12010-07-12 14:36:09 +100035#include <linux/memblock.h>
David Gibson0895ecd2009-10-26 19:24:31 +000036#include <linux/hugetlb.h>
Anton Blanchardc40dd2f2011-11-02 14:56:12 +000037#include <linux/slab.h>
Anton Blanchard16d0f5c2014-10-14 22:17:47 +110038#include <linux/vmalloc.h>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100039
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>
Paul Mackerras7c8c6b92005-10-06 12:23:33 +100050#include <asm/sections.h>
Tony Breedsdb7f37d2008-07-01 11:30:06 +100051#include <asm/sparsemem.h>
Paul Mackerrasab1f9da2005-10-10 21:58:35 +100052#include <asm/vdso.h>
Kumar Gala2c419bd2008-04-23 23:05:20 +100053#include <asm/fixmap.h>
FUJITA Tomonoria9327292010-03-16 13:16:25 +000054#include <asm/swiotlb.h>
sukadev@linux.vnet.ibm.com8a3e3d32011-12-02 12:26:23 +000055#include <asm/rtas.h>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100056
Paul Mackerras14cf11a2005-09-26 16:04:21 +100057#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
Suzuki Poulosea84fcd42012-08-21 01:42:33 +000064unsigned long long memory_limit;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +100065
Kumar Gala2c419bd2008-04-23 23:05:20 +100066#ifdef CONFIG_HIGHMEM
67pte_t *kmap_pte;
Kumar Gala2c419bd2008-04-23 23:05:20 +100068EXPORT_SYMBOL(kmap_pte);
Valentina Manea8040bda2013-03-10 03:22:39 +000069pgprot_t kmap_prot;
70EXPORT_SYMBOL(kmap_prot);
Kumar Gala2c419bd2008-04-23 23:05:20 +100071
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
Paul Mackerras14cf11a2005-09-26 16:04:21 +100079int page_is_ram(unsigned long pfn)
80{
Paul Mackerras14cf11a2005-09-26 16:04:21 +100081#ifndef CONFIG_PPC64 /* XXX for now */
Roland Dreiera880e762008-09-15 10:43:35 +000082 return pfn < max_pfn;
Paul Mackerras14cf11a2005-09-26 16:04:21 +100083#else
Roland Dreiera880e762008-09-15 10:43:35 +000084 unsigned long paddr = (pfn << PAGE_SHIFT);
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +100085 struct memblock_region *reg;
Paul Mackerras14cf11a2005-09-26 16:04:21 +100086
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +100087 for_each_memblock(memory, reg)
88 if (paddr >= reg->base && paddr < (reg->base + reg->size))
Paul Mackerras14cf11a2005-09-26 16:04:21 +100089 return 1;
Paul Mackerras14cf11a2005-09-26 16:04:21 +100090 return 0;
91#endif
92}
Paul Mackerras14cf11a2005-09-26 16:04:21 +100093
Roland Dreier8b150472005-10-28 17:46:18 -070094pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
Paul Mackerras14cf11a2005-09-26 16:04:21 +100095 unsigned long size, pgprot_t vma_prot)
96{
97 if (ppc_md.phys_mem_access_prot)
Roland Dreier8b150472005-10-28 17:46:18 -070098 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
Paul Mackerras14cf11a2005-09-26 16:04:21 +100099
Roland Dreier8b150472005-10-28 17:46:18 -0700100 if (!page_is_ram(pfn))
Benjamin Herrenschmidt64b3d0e2008-12-18 19:13:51 +0000101 vma_prot = pgprot_noncached(vma_prot);
102
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000103 return vma_prot;
104}
105EXPORT_SYMBOL(phys_mem_access_prot);
106
Paul Mackerras23fd0772005-10-31 13:37:12 +1100107#ifdef CONFIG_MEMORY_HOTPLUG
108
Yasunori Gotobc02af92006-06-27 02:53:30 -0700109#ifdef CONFIG_NUMA
110int memory_add_physaddr_to_nid(u64 start)
111{
112 return hot_add_scn_to_nid(start);
113}
114#endif
115
Dan Williams033fbae2015-08-09 15:29:06 -0400116int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
Paul Mackerras23fd0772005-10-31 13:37:12 +1100117{
Mike Kravetz237a0982005-12-05 12:06:42 -0800118 struct pglist_data *pgdata;
Paul Mackerras23fd0772005-10-31 13:37:12 +1100119 struct zone *zone;
120 unsigned long start_pfn = start >> PAGE_SHIFT;
121 unsigned long nr_pages = size >> PAGE_SHIFT;
David Gibson1dace6c2016-02-09 13:32:42 +1000122 int rc;
Paul Mackerras23fd0772005-10-31 13:37:12 +1100123
Mike Kravetz237a0982005-12-05 12:06:42 -0800124 pgdata = NODE_DATA(nid);
125
Andrew Morton2d0eee12006-03-21 23:00:05 -0800126 start = (unsigned long)__va(start);
David Gibson1dace6c2016-02-09 13:32:42 +1000127 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 }
Mike Kravetz54b79242005-11-07 16:25:48 -0800134
Paul Mackerras23fd0772005-10-31 13:37:12 +1100135 /* this should work for most non-highmem platforms */
Wang Nanf51202d2014-08-06 16:07:45 -0700136 zone = pgdata->node_zones +
Dan Williams033fbae2015-08-09 15:29:06 -0400137 zone_for_memory(nid, start, size, 0, for_device);
Paul Mackerras23fd0772005-10-31 13:37:12 +1100138
Gary Hadec04fc582009-01-06 14:39:14 -0800139 return __add_pages(nid, zone, start_pfn, nr_pages);
Paul Mackerras23fd0772005-10-31 13:37:12 +1100140}
Wen Congyang24d335c2013-02-22 16:32:58 -0800141
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;
Nathan Fontenot9ac8cde2014-01-27 10:54:06 -0600148 int ret;
Wen Congyang24d335c2013-02-22 16:32:58 -0800149
150 zone = page_zone(pfn_to_page(start_pfn));
Nathan Fontenot9ac8cde2014-01-27 10:54:06 -0600151 ret = __remove_pages(zone, start_pfn, nr_pages);
Anton Blanchard16d0f5c2014-10-14 22:17:47 +1100152 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();
Nathan Fontenot9ac8cde2014-01-27 10:54:06 -0600163
164 return ret;
Wen Congyang24d335c2013-02-22 16:32:58 -0800165}
166#endif
Nathan Lynch0d579942008-06-04 08:30:54 +1000167#endif /* CONFIG_MEMORY_HOTPLUG */
Badari Pulavartya99824f2008-02-05 00:10:18 -0800168
169/*
170 * walk_memory_resource() needs to make sure there is no holes in a given
Badari Pulavarty9d88a2e2008-04-18 13:33:53 -0700171 * memory range. PPC64 does not maintain the memory layout in /proc/iomem.
Yinghai Lu95f72d12010-07-12 14:36:09 +1000172 * Instead it maintains it in memblock.memory structures. Walk through the
Badari Pulavarty9d88a2e2008-04-18 13:33:53 -0700173 * memory regions, find holes and callback for contiguous regions.
Badari Pulavartya99824f2008-02-05 00:10:18 -0800174 */
175int
KAMEZAWA Hiroyuki908eedc2009-09-22 16:45:46 -0700176walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
177 void *arg, int (*func)(unsigned long, unsigned long, void *))
Badari Pulavartya99824f2008-02-05 00:10:18 -0800178{
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +1000179 struct memblock_region *reg;
180 unsigned long end_pfn = start_pfn + nr_pages;
181 unsigned long tstart, tend;
Badari Pulavarty9d88a2e2008-04-18 13:33:53 -0700182 int ret = -1;
183
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +1000184 for_each_memblock(memory, reg) {
Yinghai Luc7fc2de2010-10-12 14:07:09 -0700185 tstart = max(start_pfn, memblock_region_memory_base_pfn(reg));
186 tend = min(end_pfn, memblock_region_memory_end_pfn(reg));
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +1000187 if (tstart >= tend)
188 continue;
189 ret = (*func)(tstart, tend - tstart, arg);
Badari Pulavarty9d88a2e2008-04-18 13:33:53 -0700190 if (ret)
191 break;
Badari Pulavarty9d88a2e2008-04-18 13:33:53 -0700192 }
193 return ret;
Badari Pulavartya99824f2008-02-05 00:10:18 -0800194}
KAMEZAWA Hiroyuki908eedc2009-09-22 16:45:46 -0700195EXPORT_SYMBOL_GPL(walk_system_ram_range);
Badari Pulavartya99824f2008-02-05 00:10:18 -0800196
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000197#ifndef CONFIG_NEED_MULTIPLE_NODES
Anton Blanchard10239732014-09-17 22:15:33 +1000198void __init initmem_init(void)
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000199{
Yinghai Lu95f72d12010-07-12 14:36:09 +1000200 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
Anton Blanchard10239732014-09-17 22:15:33 +1000201 min_low_pfn = MEMORY_START >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000202#ifdef CONFIG_HIGHMEM
Kumar Galad7917ba2008-04-16 05:52:22 +1000203 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000204#endif
205
Cody P Schafer4e8309b2013-01-09 12:40:18 +0000206 /* Place all memblock_regions in the same node and merge contiguous
207 * memblock_regions
208 */
Tang Chene7e8de52014-01-21 15:49:26 -0800209 memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0);
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700210
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000211 /* XXX need to clip this if using highmem? */
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700212 sparse_memory_present_with_active_regions(0);
Anton Blanchard21098b92014-09-17 22:15:36 +1000213 sparse_init();
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000214}
215
Johannes Berg4e8ad3e2007-05-08 19:25:00 +1000216/* mark pages that don't exist as nosave */
217static int __init mark_nonram_nosave(void)
218{
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +1000219 struct memblock_region *reg, *prev = NULL;
Johannes Berg4e8ad3e2007-05-08 19:25:00 +1000220
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +1000221 for_each_memblock(memory, reg) {
222 if (prev &&
Yinghai Luc7fc2de2010-10-12 14:07:09 -0700223 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));
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +1000226 prev = reg;
Johannes Berg4e8ad3e2007-05-08 19:25:00 +1000227 }
Johannes Berg4e8ad3e2007-05-08 19:25:00 +1000228 return 0;
229}
Scott Wood6db35ad2014-09-18 14:05:02 -0500230#else /* CONFIG_NEED_MULTIPLE_NODES */
231static int __init mark_nonram_nosave(void)
232{
233 return 0;
234}
235#endif
Johannes Berg4e8ad3e2007-05-08 19:25:00 +1000236
Scott Wood1c980252014-08-08 18:40:42 -0500237static 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}
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000284
285/*
286 * paging_init() sets up the page tables - in fact we've already done this.
287 */
288void __init paging_init(void)
289{
Tony Breedsf7ba2992011-07-04 18:44:19 +0000290 unsigned long long total_ram = memblock_phys_mem_size();
Yinghai Lu95f72d12010-07-12 14:36:09 +1000291 phys_addr_t top_of_ram = memblock_end_of_DRAM();
Scott Wood1c980252014-08-08 18:40:42 -0500292 enum zone_type top_zone;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000293
Kumar Gala2c419bd2008-04-23 23:05:20 +1000294#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
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000302#ifdef CONFIG_HIGHMEM
303 map_page(PKMAP_BASE, 0, 0); /* XXX gross */
Kumar Gala2c419bd2008-04-23 23:05:20 +1000304 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
305
306 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000307 kmap_prot = PAGE_KERNEL;
308#endif /* CONFIG_HIGHMEM */
309
Tony Breedsf7ba2992011-07-04 18:44:19 +0000310 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
Tony Breedsfb610632008-07-31 13:51:42 +1000311 (unsigned long long)top_of_ram, total_ram);
Olof Johanssone110b282006-04-12 15:25:01 -0500312 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
Stefan Roese2bf30162008-07-10 01:09:23 +1000313 (long int)((top_of_ram - total_ram) >> 20));
Scott Wood1c980252014-08-08 18:40:42 -0500314
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000315#ifdef CONFIG_HIGHMEM
Scott Wood1c980252014-08-08 18:40:42 -0500316 top_zone = ZONE_HIGHMEM;
317 limit_zone_pfn(ZONE_NORMAL, lowmem_end_addr >> PAGE_SHIFT);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000318#else
Scott Wood1c980252014-08-08 18:40:42 -0500319 top_zone = ZONE_NORMAL;
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700320#endif
Scott Wood1c980252014-08-08 18:40:42 -0500321
322 limit_zone_pfn(top_zone, top_of_ram >> PAGE_SHIFT);
323 zone_limits_final = true;
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700324 free_area_init_nodes(max_zone_pfns);
Johannes Berg4e8ad3e2007-05-08 19:25:00 +1000325
326 mark_nonram_nosave();
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000327}
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000328
329void __init mem_init(void)
330{
Scott Wood28efc352013-10-11 19:22:38 -0500331 /*
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
FUJITA Tomonoria9327292010-03-16 13:16:25 +0000337#ifdef CONFIG_SWIOTLB
Jia Hongtao688ba1d2012-08-03 18:14:10 +0800338 swiotlb_init(0);
FUJITA Tomonoria9327292010-03-16 13:16:25 +0000339#endif
340
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000341 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
Jiang Liu602ddc72013-07-03 15:04:32 -0700342 set_max_mapnr(max_pfn);
Jiang Liu0c988532013-07-03 15:03:24 -0700343 free_all_bootmem();
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000344
345#ifdef CONFIG_HIGHMEM
346 {
347 unsigned long pfn, highmem_mapnr;
348
Kumar Galad7917ba2008-04-16 05:52:22 +1000349 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000350 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
Becky Bruce3d41e0f2011-06-28 09:54:46 +0000351 phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000352 struct page *page = pfn_to_page(pfn);
Jiang Liu369a9d82013-07-03 15:04:09 -0700353 if (!memblock_is_reserved(paddr))
354 free_highmem_page(page);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000355 }
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000356 }
357#endif /* CONFIG_HIGHMEM */
358
Becky Bruce3160b092011-06-28 14:54:47 -0500359#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
Jiang Liu369a9d82013-07-03 15:04:09 -0700368 mem_init_print_info(NULL);
Benjamin Herrenschmidtf637a492009-05-27 13:44:50 +1000369#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 */
Benjamin Herrenschmidt8b31e492009-05-27 13:50:33 +1000376#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 */
Benjamin Herrenschmidtf637a492009-05-27 13:44:50 +1000380 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 */
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000385}
386
Dave Carroll2773fcc2011-06-18 07:36:39 +0000387void free_initmem(void)
388{
Dave Carrolla9c0f412011-06-18 07:36:40 +0000389 ppc_md.progress = ppc_printk_progress;
Jiang Liu5d585e52013-04-29 15:06:47 -0700390 free_initmem_default(POISON_FREE_INITMEM);
Dave Carroll2773fcc2011-06-18 07:36:39 +0000391}
392
Benjamin Herrenschmidt307cfe72011-06-09 16:52:38 +1000393#ifdef CONFIG_BLK_DEV_INITRD
394void __init free_initrd_mem(unsigned long start, unsigned long end)
395{
Jiang Liudbe67df2013-07-03 15:02:51 -0700396 free_reserved_area((void *)start, (void *)end, -1, "initrd");
Benjamin Herrenschmidt307cfe72011-06-09 16:52:38 +1000397}
398#endif
399
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000400/*
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000401 * 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{
David Gibson0895ecd2009-10-26 19:24:31 +0000417#ifdef CONFIG_HUGETLB_PAGE
418 if (PageCompound(page)) {
419 flush_dcache_icache_hugepage(page);
420 return;
421 }
422#endif
Scott Wood2f7d2b72015-04-15 19:40:23 -0500423#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 *)) {
Cong Wang2480b202011-11-25 23:14:16 +0800428 void *start = kmap_atomic(page);
David Gibson0895ecd2009-10-26 19:24:31 +0000429 __flush_dcache_icache(start);
Cong Wang2480b202011-11-25 23:14:16 +0800430 kunmap_atomic(start);
Scott Wood2f7d2b72015-04-15 19:40:23 -0500431 } else {
432 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
David Gibson0895ecd2009-10-26 19:24:31 +0000433 }
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000434#endif
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000435}
Alexander Graf249ba1e2012-08-03 13:56:33 +0200436EXPORT_SYMBOL(flush_dcache_icache_page);
David Gibson0895ecd2009-10-26 19:24:31 +0000437
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000438void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
439{
440 clear_page(page);
441
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000442 /*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300443 * We shouldn't have to do this, but some versions of glibc
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000444 * require it (ld.so assumes zero filled pages are icache clean)
445 * - Anton
446 */
David Gibson09f5dc42006-02-06 13:24:53 +1100447 flush_dcache_page(pg);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000448}
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
David Gibson09f5dc42006-02-06 13:24:53 +1100471 flush_dcache_page(pg);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000472}
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 *
Hugh Dickins01edcd82005-11-23 13:37:39 -0800491 * This must always be called with the pte lock held.
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000492 */
493void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
Russell King4b3073e2009-12-18 16:40:18 +0000494 pte_t *ptep)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000495{
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100496#ifdef CONFIG_PPC_STD_MMU
Aneesh Kumar K.V0ac52dd2013-06-20 14:30:22 +0530497 /*
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 */
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100501 unsigned long access = 0, trap;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000502
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000503 /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
Russell King4b3073e2009-12-18 16:40:18 +0000504 if (!pte_young(*ptep) || address >= TASK_SIZE)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000505 return;
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100506
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)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000515 return;
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100516 trap = TRAP(current->thread.regs);
517 if (trap == 0x400)
518 access |= _PAGE_EXEC;
519 else if (trap != 0x300)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000520 return;
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100521 hash_preload(vma->vm_mm, address, access, trap);
522#endif /* CONFIG_PPC_STD_MMU */
Becky Bruce41151e72011-06-28 09:54:48 +0000523#if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \
524 && defined(CONFIG_HUGETLB_PAGE)
525 if (is_vm_hugetlb_page(vma))
Becky Bruced93e4d72011-11-28 14:43:33 +0000526 book3e_hugetlb_preload(vma, address, *ptep);
Becky Bruce41151e72011-06-28 09:54:48 +0000527#endif
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000528}
Anton Blanchardc40dd2f2011-11-02 14:56:12 +0000529
530/*
531 * System memory should not be in /proc/iomem but various tools expect it
532 * (eg kdump).
533 */
Geert Uytterhoeven4f770922013-09-15 11:39:36 +0200534static int __init add_system_ram_resources(void)
Anton Blanchardc40dd2f2011-11-02 14:56:12 +0000535{
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;
Toshi Kani35d98e92016-01-26 21:57:22 +0100550 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
Anton Blanchardc40dd2f2011-11-02 14:56:12 +0000551 WARN_ON(request_resource(&iomem_resource, res) < 0);
552 }
553 }
554
555 return 0;
556}
557subsys_initcall(add_system_ram_resources);
sukadev@linux.vnet.ibm.com1d54cf22011-08-30 09:19:17 +0000558
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{
Vasant Hegdee256caa2016-01-21 21:45:31 +0530569 if (page_is_rtas_user_buf(pfn))
570 return 1;
Scott Wood6c0cc622015-04-17 16:17:14 -0500571 if (iomem_is_exclusive(PFN_PHYS(pfn)))
sukadev@linux.vnet.ibm.com1d54cf22011-08-30 09:19:17 +0000572 return 0;
573 if (!page_is_ram(pfn))
574 return 1;
575 return 0;
576}
577#endif /* CONFIG_STRICT_DEVMEM */