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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * PowerPC version
4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
5 *
6 * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
7 * and Cort Dougan (PReP) (cort@cs.nmt.edu)
8 * Copyright (C) 1996 Paul Mackerras
9 * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
10 *
11 * Derived from "arch/i386/mm/init.c"
12 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
13 */
14
15#include <linux/export.h>
16#include <linux/sched.h>
17#include <linux/kernel.h>
18#include <linux/errno.h>
19#include <linux/string.h>
20#include <linux/gfp.h>
21#include <linux/types.h>
22#include <linux/mm.h>
23#include <linux/stddef.h>
24#include <linux/init.h>
25#include <linux/memblock.h>
26#include <linux/highmem.h>
27#include <linux/initrd.h>
28#include <linux/pagemap.h>
29#include <linux/suspend.h>
30#include <linux/hugetlb.h>
31#include <linux/slab.h>
32#include <linux/vmalloc.h>
33#include <linux/memremap.h>
34
35#include <asm/pgalloc.h>
36#include <asm/prom.h>
37#include <asm/io.h>
38#include <asm/mmu_context.h>
39#include <asm/pgtable.h>
40#include <asm/mmu.h>
41#include <asm/smp.h>
42#include <asm/machdep.h>
43#include <asm/btext.h>
44#include <asm/tlb.h>
45#include <asm/sections.h>
46#include <asm/sparsemem.h>
47#include <asm/vdso.h>
48#include <asm/fixmap.h>
49#include <asm/swiotlb.h>
50#include <asm/rtas.h>
51
52#include <mm/mmu_decl.h>
53
54#ifndef CPU_FTR_COHERENT_ICACHE
55#define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */
56#define CPU_FTR_NOEXECUTE 0
57#endif
58
59unsigned long long memory_limit;
60bool init_mem_is_free;
61
62#ifdef CONFIG_HIGHMEM
63pte_t *kmap_pte;
64EXPORT_SYMBOL(kmap_pte);
65pgprot_t kmap_prot;
66EXPORT_SYMBOL(kmap_prot);
67
68static inline pte_t *virt_to_kpte(unsigned long vaddr)
69{
70 return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
71 vaddr), vaddr), vaddr);
72}
73#endif
74
75pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
76 unsigned long size, pgprot_t vma_prot)
77{
78 if (ppc_md.phys_mem_access_prot)
79 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
80
81 if (!page_is_ram(pfn))
82 vma_prot = pgprot_noncached(vma_prot);
83
84 return vma_prot;
85}
86EXPORT_SYMBOL(phys_mem_access_prot);
87
88#ifdef CONFIG_MEMORY_HOTPLUG
89
90#ifdef CONFIG_NUMA
91int memory_add_physaddr_to_nid(u64 start)
92{
93 return hot_add_scn_to_nid(start);
94}
95#endif
96
97int __weak create_section_mapping(unsigned long start, unsigned long end, int nid)
98{
99 return -ENODEV;
100}
101
102int __weak remove_section_mapping(unsigned long start, unsigned long end)
103{
104 return -ENODEV;
105}
106
107int __ref arch_add_memory(int nid, u64 start, u64 size,
108 struct mhp_restrictions *restrictions)
109{
110 unsigned long start_pfn = start >> PAGE_SHIFT;
111 unsigned long nr_pages = size >> PAGE_SHIFT;
112 int rc;
113
114 resize_hpt_for_hotplug(memblock_phys_mem_size());
115
116 start = (unsigned long)__va(start);
117 rc = create_section_mapping(start, start + size, nid);
118 if (rc) {
119 pr_warn("Unable to create mapping for hot added memory 0x%llx..0x%llx: %d\n",
120 start, start + size, rc);
121 return -EFAULT;
122 }
123 flush_dcache_range(start, start + size);
124
125 return __add_pages(nid, start_pfn, nr_pages, restrictions);
126}
127
128void __ref arch_remove_memory(int nid, u64 start, u64 size,
129 struct vmem_altmap *altmap)
130{
131 unsigned long start_pfn = start >> PAGE_SHIFT;
132 unsigned long nr_pages = size >> PAGE_SHIFT;
133 struct page *page = pfn_to_page(start_pfn) + vmem_altmap_offset(altmap);
134 int ret;
135
136 __remove_pages(page_zone(page), start_pfn, nr_pages, altmap);
137
138 /* Remove htab bolted mappings for this section of memory */
139 start = (unsigned long)__va(start);
140 flush_dcache_range(start, start + size);
141 ret = remove_section_mapping(start, start + size);
142 WARN_ON_ONCE(ret);
143
144 /* Ensure all vmalloc mappings are flushed in case they also
145 * hit that section of memory
146 */
147 vm_unmap_aliases();
148
149 if (resize_hpt_for_hotplug(memblock_phys_mem_size()) == -ENOSPC)
150 pr_warn("Hash collision while resizing HPT\n");
151}
152#endif
153
154#ifndef CONFIG_NEED_MULTIPLE_NODES
155void __init mem_topology_setup(void)
156{
157 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
158 min_low_pfn = MEMORY_START >> PAGE_SHIFT;
159#ifdef CONFIG_HIGHMEM
160 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
161#endif
162
163 /* Place all memblock_regions in the same node and merge contiguous
164 * memblock_regions
165 */
166 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
167}
168
169void __init initmem_init(void)
170{
171 /* XXX need to clip this if using highmem? */
172 sparse_memory_present_with_active_regions(0);
173 sparse_init();
174}
175
176/* mark pages that don't exist as nosave */
177static int __init mark_nonram_nosave(void)
178{
179 struct memblock_region *reg, *prev = NULL;
180
181 for_each_memblock(memory, reg) {
182 if (prev &&
183 memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg))
184 register_nosave_region(memblock_region_memory_end_pfn(prev),
185 memblock_region_memory_base_pfn(reg));
186 prev = reg;
187 }
188 return 0;
189}
190#else /* CONFIG_NEED_MULTIPLE_NODES */
191static int __init mark_nonram_nosave(void)
192{
193 return 0;
194}
195#endif
196
197/*
198 * Zones usage:
199 *
200 * We setup ZONE_DMA to be 31-bits on all platforms and ZONE_NORMAL to be
201 * everything else. GFP_DMA32 page allocations automatically fall back to
202 * ZONE_DMA.
203 *
204 * By using 31-bit unconditionally, we can exploit ARCH_ZONE_DMA_BITS to
205 * inform the generic DMA mapping code. 32-bit only devices (if not handled
206 * by an IOMMU anyway) will take a first dip into ZONE_NORMAL and get
207 * otherwise served by ZONE_DMA.
208 */
209static unsigned long max_zone_pfns[MAX_NR_ZONES];
210
211/*
212 * paging_init() sets up the page tables - in fact we've already done this.
213 */
214void __init paging_init(void)
215{
216 unsigned long long total_ram = memblock_phys_mem_size();
217 phys_addr_t top_of_ram = memblock_end_of_DRAM();
218
219#ifdef CONFIG_PPC32
220 unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1);
221 unsigned long end = __fix_to_virt(FIX_HOLE);
222
223 for (; v < end; v += PAGE_SIZE)
224 map_kernel_page(v, 0, __pgprot(0)); /* XXX gross */
225#endif
226
227#ifdef CONFIG_HIGHMEM
228 map_kernel_page(PKMAP_BASE, 0, __pgprot(0)); /* XXX gross */
229 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
230
231 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
232 kmap_prot = PAGE_KERNEL;
233#endif /* CONFIG_HIGHMEM */
234
235 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
236 (unsigned long long)top_of_ram, total_ram);
237 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
238 (long int)((top_of_ram - total_ram) >> 20));
239
240#ifdef CONFIG_ZONE_DMA
241 max_zone_pfns[ZONE_DMA] = min(max_low_pfn,
242 1UL << (ARCH_ZONE_DMA_BITS - PAGE_SHIFT));
243#endif
244 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
245#ifdef CONFIG_HIGHMEM
246 max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
247#endif
248
249 free_area_init_nodes(max_zone_pfns);
250
251 mark_nonram_nosave();
252}
253
254void __init mem_init(void)
255{
256 /*
257 * book3s is limited to 16 page sizes due to encoding this in
258 * a 4-bit field for slices.
259 */
260 BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
261
262#ifdef CONFIG_SWIOTLB
263 swiotlb_init(0);
264#endif
265
266 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
267 set_max_mapnr(max_pfn);
268 memblock_free_all();
269
270#ifdef CONFIG_HIGHMEM
271 {
272 unsigned long pfn, highmem_mapnr;
273
274 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
275 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
276 phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
277 struct page *page = pfn_to_page(pfn);
278 if (!memblock_is_reserved(paddr))
279 free_highmem_page(page);
280 }
281 }
282#endif /* CONFIG_HIGHMEM */
283
284#if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP)
285 /*
286 * If smp is enabled, next_tlbcam_idx is initialized in the cpu up
287 * functions.... do it here for the non-smp case.
288 */
289 per_cpu(next_tlbcam_idx, smp_processor_id()) =
290 (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
291#endif
292
293 mem_init_print_info(NULL);
294#ifdef CONFIG_PPC32
295 pr_info("Kernel virtual memory layout:\n");
296#ifdef CONFIG_KASAN
297 pr_info(" * 0x%08lx..0x%08lx : kasan shadow mem\n",
298 KASAN_SHADOW_START, KASAN_SHADOW_END);
299#endif
300 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
301#ifdef CONFIG_HIGHMEM
302 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
303 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
304#endif /* CONFIG_HIGHMEM */
305 if (ioremap_bot != IOREMAP_TOP)
306 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
307 ioremap_bot, IOREMAP_TOP);
308 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
309 VMALLOC_START, VMALLOC_END);
310#endif /* CONFIG_PPC32 */
311}
312
313void free_initmem(void)
314{
315 ppc_md.progress = ppc_printk_progress;
316 mark_initmem_nx();
317 init_mem_is_free = true;
318 free_initmem_default(POISON_FREE_INITMEM);
319}
320
321/*
322 * This is called when a page has been modified by the kernel.
323 * It just marks the page as not i-cache clean. We do the i-cache
324 * flush later when the page is given to a user process, if necessary.
325 */
326void flush_dcache_page(struct page *page)
327{
328 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
329 return;
330 /* avoid an atomic op if possible */
331 if (test_bit(PG_arch_1, &page->flags))
332 clear_bit(PG_arch_1, &page->flags);
333}
334EXPORT_SYMBOL(flush_dcache_page);
335
336void flush_dcache_icache_page(struct page *page)
337{
338#ifdef CONFIG_HUGETLB_PAGE
339 if (PageCompound(page)) {
340 flush_dcache_icache_hugepage(page);
341 return;
342 }
343#endif
344#if defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC64)
345 /* On 8xx there is no need to kmap since highmem is not supported */
346 __flush_dcache_icache(page_address(page));
347#else
348 if (IS_ENABLED(CONFIG_BOOKE) || sizeof(phys_addr_t) > sizeof(void *)) {
349 void *start = kmap_atomic(page);
350 __flush_dcache_icache(start);
351 kunmap_atomic(start);
352 } else {
353 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
354 }
355#endif
356}
357EXPORT_SYMBOL(flush_dcache_icache_page);
358
359void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
360{
361 clear_page(page);
362
363 /*
364 * We shouldn't have to do this, but some versions of glibc
365 * require it (ld.so assumes zero filled pages are icache clean)
366 * - Anton
367 */
368 flush_dcache_page(pg);
369}
370EXPORT_SYMBOL(clear_user_page);
371
372void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
373 struct page *pg)
374{
375 copy_page(vto, vfrom);
376
377 /*
378 * We should be able to use the following optimisation, however
379 * there are two problems.
380 * Firstly a bug in some versions of binutils meant PLT sections
381 * were not marked executable.
382 * Secondly the first word in the GOT section is blrl, used
383 * to establish the GOT address. Until recently the GOT was
384 * not marked executable.
385 * - Anton
386 */
387#if 0
388 if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
389 return;
390#endif
391
392 flush_dcache_page(pg);
393}
394
395void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
396 unsigned long addr, int len)
397{
398 unsigned long maddr;
399
400 maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
401 flush_icache_range(maddr, maddr + len);
402 kunmap(page);
403}
404EXPORT_SYMBOL(flush_icache_user_range);
405
406/*
407 * System memory should not be in /proc/iomem but various tools expect it
408 * (eg kdump).
409 */
410static int __init add_system_ram_resources(void)
411{
412 struct memblock_region *reg;
413
414 for_each_memblock(memory, reg) {
415 struct resource *res;
416 unsigned long base = reg->base;
417 unsigned long size = reg->size;
418
419 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
420 WARN_ON(!res);
421
422 if (res) {
423 res->name = "System RAM";
424 res->start = base;
425 res->end = base + size - 1;
426 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
427 WARN_ON(request_resource(&iomem_resource, res) < 0);
428 }
429 }
430
431 return 0;
432}
433subsys_initcall(add_system_ram_resources);
434
435#ifdef CONFIG_STRICT_DEVMEM
436/*
437 * devmem_is_allowed(): check to see if /dev/mem access to a certain address
438 * is valid. The argument is a physical page number.
439 *
440 * Access has to be given to non-kernel-ram areas as well, these contain the
441 * PCI mmio resources as well as potential bios/acpi data regions.
442 */
443int devmem_is_allowed(unsigned long pfn)
444{
445 if (page_is_rtas_user_buf(pfn))
446 return 1;
447 if (iomem_is_exclusive(PFN_PHYS(pfn)))
448 return 0;
449 if (!page_is_ram(pfn))
450 return 1;
451 return 0;
452}
453#endif /* CONFIG_STRICT_DEVMEM */
454
455/*
456 * This is defined in kernel/resource.c but only powerpc needs to export it, for
457 * the EHEA driver. Drop this when drivers/net/ethernet/ibm/ehea is removed.
458 */
459EXPORT_SYMBOL_GPL(walk_system_ram_range);
1/*
2 * PowerPC version
3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
4 *
5 * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
6 * and Cort Dougan (PReP) (cort@cs.nmt.edu)
7 * Copyright (C) 1996 Paul Mackerras
8 * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
9 *
10 * Derived from "arch/i386/mm/init.c"
11 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 *
18 */
19
20#include <linux/export.h>
21#include <linux/sched.h>
22#include <linux/kernel.h>
23#include <linux/errno.h>
24#include <linux/string.h>
25#include <linux/gfp.h>
26#include <linux/types.h>
27#include <linux/mm.h>
28#include <linux/stddef.h>
29#include <linux/init.h>
30#include <linux/bootmem.h>
31#include <linux/highmem.h>
32#include <linux/initrd.h>
33#include <linux/pagemap.h>
34#include <linux/suspend.h>
35#include <linux/memblock.h>
36#include <linux/hugetlb.h>
37#include <linux/slab.h>
38#include <linux/vmalloc.h>
39#include <linux/memremap.h>
40
41#include <asm/pgalloc.h>
42#include <asm/prom.h>
43#include <asm/io.h>
44#include <asm/mmu_context.h>
45#include <asm/pgtable.h>
46#include <asm/mmu.h>
47#include <asm/smp.h>
48#include <asm/machdep.h>
49#include <asm/btext.h>
50#include <asm/tlb.h>
51#include <asm/sections.h>
52#include <asm/sparsemem.h>
53#include <asm/vdso.h>
54#include <asm/fixmap.h>
55#include <asm/swiotlb.h>
56#include <asm/rtas.h>
57
58#include "mmu_decl.h"
59
60#ifndef CPU_FTR_COHERENT_ICACHE
61#define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */
62#define CPU_FTR_NOEXECUTE 0
63#endif
64
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#define TOP_ZONE ZONE_HIGHMEM
73
74static inline pte_t *virt_to_kpte(unsigned long vaddr)
75{
76 return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
77 vaddr), vaddr), vaddr);
78}
79#else
80#define TOP_ZONE ZONE_NORMAL
81#endif
82
83int page_is_ram(unsigned long pfn)
84{
85 return memblock_is_memory(__pfn_to_phys(pfn));
86}
87
88pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
89 unsigned long size, pgprot_t vma_prot)
90{
91 if (ppc_md.phys_mem_access_prot)
92 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
93
94 if (!page_is_ram(pfn))
95 vma_prot = pgprot_noncached(vma_prot);
96
97 return vma_prot;
98}
99EXPORT_SYMBOL(phys_mem_access_prot);
100
101#ifdef CONFIG_MEMORY_HOTPLUG
102
103#ifdef CONFIG_NUMA
104int memory_add_physaddr_to_nid(u64 start)
105{
106 return hot_add_scn_to_nid(start);
107}
108#endif
109
110int __weak create_section_mapping(unsigned long start, unsigned long end, int nid)
111{
112 return -ENODEV;
113}
114
115int __weak remove_section_mapping(unsigned long start, unsigned long end)
116{
117 return -ENODEV;
118}
119
120int __meminit arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
121 bool want_memblock)
122{
123 unsigned long start_pfn = start >> PAGE_SHIFT;
124 unsigned long nr_pages = size >> PAGE_SHIFT;
125 int rc;
126
127 resize_hpt_for_hotplug(memblock_phys_mem_size());
128
129 start = (unsigned long)__va(start);
130 rc = create_section_mapping(start, start + size, nid);
131 if (rc) {
132 pr_warn("Unable to create mapping for hot added memory 0x%llx..0x%llx: %d\n",
133 start, start + size, rc);
134 return -EFAULT;
135 }
136 flush_inval_dcache_range(start, start + size);
137
138 return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
139}
140
141#ifdef CONFIG_MEMORY_HOTREMOVE
142int __meminit arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
143{
144 unsigned long start_pfn = start >> PAGE_SHIFT;
145 unsigned long nr_pages = size >> PAGE_SHIFT;
146 struct page *page;
147 int ret;
148
149 /*
150 * If we have an altmap then we need to skip over any reserved PFNs
151 * when querying the zone.
152 */
153 page = pfn_to_page(start_pfn);
154 if (altmap)
155 page += vmem_altmap_offset(altmap);
156
157 ret = __remove_pages(page_zone(page), start_pfn, nr_pages, altmap);
158 if (ret)
159 return ret;
160
161 /* Remove htab bolted mappings for this section of memory */
162 start = (unsigned long)__va(start);
163 flush_inval_dcache_range(start, start + size);
164 ret = remove_section_mapping(start, start + size);
165
166 /* Ensure all vmalloc mappings are flushed in case they also
167 * hit that section of memory
168 */
169 vm_unmap_aliases();
170
171 resize_hpt_for_hotplug(memblock_phys_mem_size());
172
173 return ret;
174}
175#endif
176#endif /* CONFIG_MEMORY_HOTPLUG */
177
178/*
179 * walk_memory_resource() needs to make sure there is no holes in a given
180 * memory range. PPC64 does not maintain the memory layout in /proc/iomem.
181 * Instead it maintains it in memblock.memory structures. Walk through the
182 * memory regions, find holes and callback for contiguous regions.
183 */
184int
185walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
186 void *arg, int (*func)(unsigned long, unsigned long, void *))
187{
188 struct memblock_region *reg;
189 unsigned long end_pfn = start_pfn + nr_pages;
190 unsigned long tstart, tend;
191 int ret = -1;
192
193 for_each_memblock(memory, reg) {
194 tstart = max(start_pfn, memblock_region_memory_base_pfn(reg));
195 tend = min(end_pfn, memblock_region_memory_end_pfn(reg));
196 if (tstart >= tend)
197 continue;
198 ret = (*func)(tstart, tend - tstart, arg);
199 if (ret)
200 break;
201 }
202 return ret;
203}
204EXPORT_SYMBOL_GPL(walk_system_ram_range);
205
206#ifndef CONFIG_NEED_MULTIPLE_NODES
207void __init mem_topology_setup(void)
208{
209 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
210 min_low_pfn = MEMORY_START >> PAGE_SHIFT;
211#ifdef CONFIG_HIGHMEM
212 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
213#endif
214
215 /* Place all memblock_regions in the same node and merge contiguous
216 * memblock_regions
217 */
218 memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0);
219}
220
221void __init initmem_init(void)
222{
223 /* XXX need to clip this if using highmem? */
224 sparse_memory_present_with_active_regions(0);
225 sparse_init();
226}
227
228/* mark pages that don't exist as nosave */
229static int __init mark_nonram_nosave(void)
230{
231 struct memblock_region *reg, *prev = NULL;
232
233 for_each_memblock(memory, reg) {
234 if (prev &&
235 memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg))
236 register_nosave_region(memblock_region_memory_end_pfn(prev),
237 memblock_region_memory_base_pfn(reg));
238 prev = reg;
239 }
240 return 0;
241}
242#else /* CONFIG_NEED_MULTIPLE_NODES */
243static int __init mark_nonram_nosave(void)
244{
245 return 0;
246}
247#endif
248
249static bool zone_limits_final;
250
251/*
252 * The memory zones past TOP_ZONE are managed by generic mm code.
253 * These should be set to zero since that's what every other
254 * architecture does.
255 */
256static unsigned long max_zone_pfns[MAX_NR_ZONES] = {
257 [0 ... TOP_ZONE ] = ~0UL,
258 [TOP_ZONE + 1 ... MAX_NR_ZONES - 1] = 0
259};
260
261/*
262 * Restrict the specified zone and all more restrictive zones
263 * to be below the specified pfn. May not be called after
264 * paging_init().
265 */
266void __init limit_zone_pfn(enum zone_type zone, unsigned long pfn_limit)
267{
268 int i;
269
270 if (WARN_ON(zone_limits_final))
271 return;
272
273 for (i = zone; i >= 0; i--) {
274 if (max_zone_pfns[i] > pfn_limit)
275 max_zone_pfns[i] = pfn_limit;
276 }
277}
278
279/*
280 * Find the least restrictive zone that is entirely below the
281 * specified pfn limit. Returns < 0 if no suitable zone is found.
282 *
283 * pfn_limit must be u64 because it can exceed 32 bits even on 32-bit
284 * systems -- the DMA limit can be higher than any possible real pfn.
285 */
286int dma_pfn_limit_to_zone(u64 pfn_limit)
287{
288 int i;
289
290 for (i = TOP_ZONE; i >= 0; i--) {
291 if (max_zone_pfns[i] <= pfn_limit)
292 return i;
293 }
294
295 return -EPERM;
296}
297
298/*
299 * paging_init() sets up the page tables - in fact we've already done this.
300 */
301void __init paging_init(void)
302{
303 unsigned long long total_ram = memblock_phys_mem_size();
304 phys_addr_t top_of_ram = memblock_end_of_DRAM();
305
306#ifdef CONFIG_PPC32
307 unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1);
308 unsigned long end = __fix_to_virt(FIX_HOLE);
309
310 for (; v < end; v += PAGE_SIZE)
311 map_kernel_page(v, 0, 0); /* XXX gross */
312#endif
313
314#ifdef CONFIG_HIGHMEM
315 map_kernel_page(PKMAP_BASE, 0, 0); /* XXX gross */
316 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
317
318 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
319 kmap_prot = PAGE_KERNEL;
320#endif /* CONFIG_HIGHMEM */
321
322 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
323 (unsigned long long)top_of_ram, total_ram);
324 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
325 (long int)((top_of_ram - total_ram) >> 20));
326
327#ifdef CONFIG_HIGHMEM
328 limit_zone_pfn(ZONE_NORMAL, lowmem_end_addr >> PAGE_SHIFT);
329#endif
330 limit_zone_pfn(TOP_ZONE, top_of_ram >> PAGE_SHIFT);
331 zone_limits_final = true;
332 free_area_init_nodes(max_zone_pfns);
333
334 mark_nonram_nosave();
335}
336
337void __init mem_init(void)
338{
339 /*
340 * book3s is limited to 16 page sizes due to encoding this in
341 * a 4-bit field for slices.
342 */
343 BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
344
345#ifdef CONFIG_SWIOTLB
346 swiotlb_init(0);
347#endif
348
349 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
350 set_max_mapnr(max_pfn);
351 free_all_bootmem();
352
353#ifdef CONFIG_HIGHMEM
354 {
355 unsigned long pfn, highmem_mapnr;
356
357 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
358 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
359 phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
360 struct page *page = pfn_to_page(pfn);
361 if (!memblock_is_reserved(paddr))
362 free_highmem_page(page);
363 }
364 }
365#endif /* CONFIG_HIGHMEM */
366
367#if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP)
368 /*
369 * If smp is enabled, next_tlbcam_idx is initialized in the cpu up
370 * functions.... do it here for the non-smp case.
371 */
372 per_cpu(next_tlbcam_idx, smp_processor_id()) =
373 (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
374#endif
375
376 mem_init_print_info(NULL);
377#ifdef CONFIG_PPC32
378 pr_info("Kernel virtual memory layout:\n");
379 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
380#ifdef CONFIG_HIGHMEM
381 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
382 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
383#endif /* CONFIG_HIGHMEM */
384#ifdef CONFIG_NOT_COHERENT_CACHE
385 pr_info(" * 0x%08lx..0x%08lx : consistent mem\n",
386 IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE);
387#endif /* CONFIG_NOT_COHERENT_CACHE */
388 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
389 ioremap_bot, IOREMAP_TOP);
390 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
391 VMALLOC_START, VMALLOC_END);
392#endif /* CONFIG_PPC32 */
393}
394
395void free_initmem(void)
396{
397 ppc_md.progress = ppc_printk_progress;
398 mark_initmem_nx();
399 free_initmem_default(POISON_FREE_INITMEM);
400}
401
402#ifdef CONFIG_BLK_DEV_INITRD
403void __init free_initrd_mem(unsigned long start, unsigned long end)
404{
405 free_reserved_area((void *)start, (void *)end, -1, "initrd");
406}
407#endif
408
409/*
410 * This is called when a page has been modified by the kernel.
411 * It just marks the page as not i-cache clean. We do the i-cache
412 * flush later when the page is given to a user process, if necessary.
413 */
414void flush_dcache_page(struct page *page)
415{
416 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
417 return;
418 /* avoid an atomic op if possible */
419 if (test_bit(PG_arch_1, &page->flags))
420 clear_bit(PG_arch_1, &page->flags);
421}
422EXPORT_SYMBOL(flush_dcache_page);
423
424void flush_dcache_icache_page(struct page *page)
425{
426#ifdef CONFIG_HUGETLB_PAGE
427 if (PageCompound(page)) {
428 flush_dcache_icache_hugepage(page);
429 return;
430 }
431#endif
432#if defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC64)
433 /* On 8xx there is no need to kmap since highmem is not supported */
434 __flush_dcache_icache(page_address(page));
435#else
436 if (IS_ENABLED(CONFIG_BOOKE) || sizeof(phys_addr_t) > sizeof(void *)) {
437 void *start = kmap_atomic(page);
438 __flush_dcache_icache(start);
439 kunmap_atomic(start);
440 } else {
441 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
442 }
443#endif
444}
445EXPORT_SYMBOL(flush_dcache_icache_page);
446
447void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
448{
449 clear_page(page);
450
451 /*
452 * We shouldn't have to do this, but some versions of glibc
453 * require it (ld.so assumes zero filled pages are icache clean)
454 * - Anton
455 */
456 flush_dcache_page(pg);
457}
458EXPORT_SYMBOL(clear_user_page);
459
460void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
461 struct page *pg)
462{
463 copy_page(vto, vfrom);
464
465 /*
466 * We should be able to use the following optimisation, however
467 * there are two problems.
468 * Firstly a bug in some versions of binutils meant PLT sections
469 * were not marked executable.
470 * Secondly the first word in the GOT section is blrl, used
471 * to establish the GOT address. Until recently the GOT was
472 * not marked executable.
473 * - Anton
474 */
475#if 0
476 if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
477 return;
478#endif
479
480 flush_dcache_page(pg);
481}
482
483void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
484 unsigned long addr, int len)
485{
486 unsigned long maddr;
487
488 maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
489 flush_icache_range(maddr, maddr + len);
490 kunmap(page);
491}
492EXPORT_SYMBOL(flush_icache_user_range);
493
494/*
495 * This is called at the end of handling a user page fault, when the
496 * fault has been handled by updating a PTE in the linux page tables.
497 * We use it to preload an HPTE into the hash table corresponding to
498 * the updated linux PTE.
499 *
500 * This must always be called with the pte lock held.
501 */
502void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
503 pte_t *ptep)
504{
505#ifdef CONFIG_PPC_STD_MMU
506 /*
507 * We don't need to worry about _PAGE_PRESENT here because we are
508 * called with either mm->page_table_lock held or ptl lock held
509 */
510 unsigned long access, trap;
511
512 if (radix_enabled())
513 return;
514
515 /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
516 if (!pte_young(*ptep) || address >= TASK_SIZE)
517 return;
518
519 /* We try to figure out if we are coming from an instruction
520 * access fault and pass that down to __hash_page so we avoid
521 * double-faulting on execution of fresh text. We have to test
522 * for regs NULL since init will get here first thing at boot
523 *
524 * We also avoid filling the hash if not coming from a fault
525 */
526
527 trap = current->thread.regs ? TRAP(current->thread.regs) : 0UL;
528 switch (trap) {
529 case 0x300:
530 access = 0UL;
531 break;
532 case 0x400:
533 access = _PAGE_EXEC;
534 break;
535 default:
536 return;
537 }
538
539 hash_preload(vma->vm_mm, address, access, trap);
540#endif /* CONFIG_PPC_STD_MMU */
541#if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \
542 && defined(CONFIG_HUGETLB_PAGE)
543 if (is_vm_hugetlb_page(vma))
544 book3e_hugetlb_preload(vma, address, *ptep);
545#endif
546}
547
548/*
549 * System memory should not be in /proc/iomem but various tools expect it
550 * (eg kdump).
551 */
552static int __init add_system_ram_resources(void)
553{
554 struct memblock_region *reg;
555
556 for_each_memblock(memory, reg) {
557 struct resource *res;
558 unsigned long base = reg->base;
559 unsigned long size = reg->size;
560
561 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
562 WARN_ON(!res);
563
564 if (res) {
565 res->name = "System RAM";
566 res->start = base;
567 res->end = base + size - 1;
568 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
569 WARN_ON(request_resource(&iomem_resource, res) < 0);
570 }
571 }
572
573 return 0;
574}
575subsys_initcall(add_system_ram_resources);
576
577#ifdef CONFIG_STRICT_DEVMEM
578/*
579 * devmem_is_allowed(): check to see if /dev/mem access to a certain address
580 * is valid. The argument is a physical page number.
581 *
582 * Access has to be given to non-kernel-ram areas as well, these contain the
583 * PCI mmio resources as well as potential bios/acpi data regions.
584 */
585int devmem_is_allowed(unsigned long pfn)
586{
587 if (page_is_rtas_user_buf(pfn))
588 return 1;
589 if (iomem_is_exclusive(PFN_PHYS(pfn)))
590 return 0;
591 if (!page_is_ram(pfn))
592 return 1;
593 return 0;
594}
595#endif /* CONFIG_STRICT_DEVMEM */