3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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)
10 * Derived from "arch/i386/mm/init.c"
11 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
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.
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/types.h>
27 #include <linux/stddef.h>
28 #include <linux/init.h>
29 #include <linux/bootmem.h>
30 #include <linux/highmem.h>
31 #include <linux/initrd.h>
32 #include <linux/pagemap.h>
33 #include <linux/suspend.h>
34 #include <linux/lmb.h>
35 #include <linux/hugetlb.h>
37 #include <asm/pgalloc.h>
40 #include <asm/mmu_context.h>
41 #include <asm/pgtable.h>
44 #include <asm/machdep.h>
45 #include <asm/btext.h>
47 #include <asm/sections.h>
48 #include <asm/sparsemem.h>
50 #include <asm/fixmap.h>
54 #ifndef CPU_FTR_COHERENT_ICACHE
55 #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */
56 #define CPU_FTR_NOEXECUTE 0
59 int init_bootmem_done;
61 phys_addr_t memory_limit;
67 EXPORT_SYMBOL(kmap_prot);
68 EXPORT_SYMBOL(kmap_pte);
70 static inline pte_t *virt_to_kpte(unsigned long vaddr)
72 return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
73 vaddr), vaddr), vaddr);
77 int page_is_ram(unsigned long pfn)
79 #ifndef CONFIG_PPC64 /* XXX for now */
82 unsigned long paddr = (pfn << PAGE_SHIFT);
84 for (i=0; i < lmb.memory.cnt; i++) {
87 base = lmb.memory.region[i].base;
89 if ((paddr >= base) &&
90 (paddr < (base + lmb.memory.region[i].size))) {
99 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
100 unsigned long size, pgprot_t vma_prot)
102 if (ppc_md.phys_mem_access_prot)
103 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
105 if (!page_is_ram(pfn))
106 vma_prot = pgprot_noncached(vma_prot);
110 EXPORT_SYMBOL(phys_mem_access_prot);
112 #ifdef CONFIG_MEMORY_HOTPLUG
115 int memory_add_physaddr_to_nid(u64 start)
117 return hot_add_scn_to_nid(start);
121 int arch_add_memory(int nid, u64 start, u64 size)
123 struct pglist_data *pgdata;
125 unsigned long start_pfn = start >> PAGE_SHIFT;
126 unsigned long nr_pages = size >> PAGE_SHIFT;
128 pgdata = NODE_DATA(nid);
130 start = (unsigned long)__va(start);
131 create_section_mapping(start, start + size);
133 /* this should work for most non-highmem platforms */
134 zone = pgdata->node_zones;
136 return __add_pages(nid, zone, start_pfn, nr_pages);
138 #endif /* CONFIG_MEMORY_HOTPLUG */
141 * walk_memory_resource() needs to make sure there is no holes in a given
142 * memory range. PPC64 does not maintain the memory layout in /proc/iomem.
143 * Instead it maintains it in lmb.memory structures. Walk through the
144 * memory regions, find holes and callback for contiguous regions.
147 walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
148 void *arg, int (*func)(unsigned long, unsigned long, void *))
150 struct lmb_property res;
151 unsigned long pfn, len;
155 res.base = (u64) start_pfn << PAGE_SHIFT;
156 res.size = (u64) nr_pages << PAGE_SHIFT;
158 end = res.base + res.size - 1;
159 while ((res.base < end) && (lmb_find(&res) >= 0)) {
160 pfn = (unsigned long)(res.base >> PAGE_SHIFT);
161 len = (unsigned long)(res.size >> PAGE_SHIFT);
162 ret = (*func)(pfn, len, arg);
165 res.base += (res.size + 1);
166 res.size = (end - res.base + 1);
170 EXPORT_SYMBOL_GPL(walk_system_ram_range);
173 * Initialize the bootmem system and give it all the memory we
174 * have available. If we are using highmem, we only put the
175 * lowmem into the bootmem system.
177 #ifndef CONFIG_NEED_MULTIPLE_NODES
178 void __init do_init_bootmem(void)
181 unsigned long start, bootmap_pages;
182 unsigned long total_pages;
185 max_low_pfn = max_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT;
186 total_pages = (lmb_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT;
187 #ifdef CONFIG_HIGHMEM
188 total_pages = total_lowmem >> PAGE_SHIFT;
189 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
193 * Find an area to use for the bootmem bitmap. Calculate the size of
194 * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE.
195 * Add 1 additional page in case the address isn't page-aligned.
197 bootmap_pages = bootmem_bootmap_pages(total_pages);
199 start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
201 min_low_pfn = MEMORY_START >> PAGE_SHIFT;
202 boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn);
204 /* Add active regions with valid PFNs */
205 for (i = 0; i < lmb.memory.cnt; i++) {
206 unsigned long start_pfn, end_pfn;
207 start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT;
208 end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i);
209 add_active_range(0, start_pfn, end_pfn);
212 /* Add all physical memory to the bootmem map, mark each area
215 #ifdef CONFIG_HIGHMEM
216 free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT);
218 /* reserve the sections we're already using */
219 for (i = 0; i < lmb.reserved.cnt; i++) {
220 unsigned long addr = lmb.reserved.region[i].base +
221 lmb_size_bytes(&lmb.reserved, i) - 1;
222 if (addr < lowmem_end_addr)
223 reserve_bootmem(lmb.reserved.region[i].base,
224 lmb_size_bytes(&lmb.reserved, i),
226 else if (lmb.reserved.region[i].base < lowmem_end_addr) {
227 unsigned long adjusted_size = lowmem_end_addr -
228 lmb.reserved.region[i].base;
229 reserve_bootmem(lmb.reserved.region[i].base,
230 adjusted_size, BOOTMEM_DEFAULT);
234 free_bootmem_with_active_regions(0, max_pfn);
236 /* reserve the sections we're already using */
237 for (i = 0; i < lmb.reserved.cnt; i++)
238 reserve_bootmem(lmb.reserved.region[i].base,
239 lmb_size_bytes(&lmb.reserved, i),
243 /* XXX need to clip this if using highmem? */
244 sparse_memory_present_with_active_regions(0);
246 init_bootmem_done = 1;
249 /* mark pages that don't exist as nosave */
250 static int __init mark_nonram_nosave(void)
252 unsigned long lmb_next_region_start_pfn,
256 for (i = 0; i < lmb.memory.cnt - 1; i++) {
258 (lmb.memory.region[i].base >> PAGE_SHIFT) +
259 (lmb.memory.region[i].size >> PAGE_SHIFT);
260 lmb_next_region_start_pfn =
261 lmb.memory.region[i+1].base >> PAGE_SHIFT;
263 if (lmb_region_max_pfn < lmb_next_region_start_pfn)
264 register_nosave_region(lmb_region_max_pfn,
265 lmb_next_region_start_pfn);
272 * paging_init() sets up the page tables - in fact we've already done this.
274 void __init paging_init(void)
276 unsigned long total_ram = lmb_phys_mem_size();
277 phys_addr_t top_of_ram = lmb_end_of_DRAM();
278 unsigned long max_zone_pfns[MAX_NR_ZONES];
281 unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1);
282 unsigned long end = __fix_to_virt(FIX_HOLE);
284 for (; v < end; v += PAGE_SIZE)
285 map_page(v, 0, 0); /* XXX gross */
288 #ifdef CONFIG_HIGHMEM
289 map_page(PKMAP_BASE, 0, 0); /* XXX gross */
290 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
292 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
293 kmap_prot = PAGE_KERNEL;
294 #endif /* CONFIG_HIGHMEM */
296 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%lx\n",
297 (unsigned long long)top_of_ram, total_ram);
298 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
299 (long int)((top_of_ram - total_ram) >> 20));
300 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
301 #ifdef CONFIG_HIGHMEM
302 max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT;
303 max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT;
305 max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
307 free_area_init_nodes(max_zone_pfns);
309 mark_nonram_nosave();
311 #endif /* ! CONFIG_NEED_MULTIPLE_NODES */
313 void __init mem_init(void)
315 #ifdef CONFIG_NEED_MULTIPLE_NODES
321 unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
323 num_physpages = lmb.memory.size >> PAGE_SHIFT;
324 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
326 #ifdef CONFIG_NEED_MULTIPLE_NODES
327 for_each_online_node(nid) {
328 if (NODE_DATA(nid)->node_spanned_pages != 0) {
329 printk("freeing bootmem node %d\n", nid);
331 free_all_bootmem_node(NODE_DATA(nid));
336 totalram_pages += free_all_bootmem();
338 for_each_online_pgdat(pgdat) {
339 for (i = 0; i < pgdat->node_spanned_pages; i++) {
340 if (!pfn_valid(pgdat->node_start_pfn + i))
342 page = pgdat_page_nr(pgdat, i);
343 if (PageReserved(page))
348 codesize = (unsigned long)&_sdata - (unsigned long)&_stext;
349 datasize = (unsigned long)&_edata - (unsigned long)&_sdata;
350 initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
351 bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start;
353 #ifdef CONFIG_HIGHMEM
355 unsigned long pfn, highmem_mapnr;
357 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
358 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
359 struct page *page = pfn_to_page(pfn);
360 if (lmb_is_reserved(pfn << PAGE_SHIFT))
362 ClearPageReserved(page);
363 init_page_count(page);
368 totalram_pages += totalhigh_pages;
369 printk(KERN_DEBUG "High memory: %luk\n",
370 totalhigh_pages << (PAGE_SHIFT-10));
372 #endif /* CONFIG_HIGHMEM */
374 printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, "
375 "%luk reserved, %luk data, %luk bss, %luk init)\n",
376 nr_free_pages() << (PAGE_SHIFT-10),
377 num_physpages << (PAGE_SHIFT-10),
379 reservedpages << (PAGE_SHIFT-10),
385 pr_info("Kernel virtual memory layout:\n");
386 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
387 #ifdef CONFIG_HIGHMEM
388 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
389 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
390 #endif /* CONFIG_HIGHMEM */
391 #ifdef CONFIG_NOT_COHERENT_CACHE
392 pr_info(" * 0x%08lx..0x%08lx : consistent mem\n",
393 IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE);
394 #endif /* CONFIG_NOT_COHERENT_CACHE */
395 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
396 ioremap_bot, IOREMAP_TOP);
397 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
398 VMALLOC_START, VMALLOC_END);
399 #endif /* CONFIG_PPC32 */
405 * This is called when a page has been modified by the kernel.
406 * It just marks the page as not i-cache clean. We do the i-cache
407 * flush later when the page is given to a user process, if necessary.
409 void flush_dcache_page(struct page *page)
411 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
413 /* avoid an atomic op if possible */
414 if (test_bit(PG_arch_1, &page->flags))
415 clear_bit(PG_arch_1, &page->flags);
417 EXPORT_SYMBOL(flush_dcache_page);
419 void flush_dcache_icache_page(struct page *page)
421 #ifdef CONFIG_HUGETLB_PAGE
422 if (PageCompound(page)) {
423 flush_dcache_icache_hugepage(page);
429 void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE);
430 __flush_dcache_icache(start);
431 kunmap_atomic(start, KM_PPC_SYNC_ICACHE);
433 #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64)
434 /* On 8xx there is no need to kmap since highmem is not supported */
435 __flush_dcache_icache(page_address(page));
437 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
441 void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
446 * We shouldnt have to do this, but some versions of glibc
447 * require it (ld.so assumes zero filled pages are icache clean)
450 flush_dcache_page(pg);
452 EXPORT_SYMBOL(clear_user_page);
454 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
457 copy_page(vto, vfrom);
460 * We should be able to use the following optimisation, however
461 * there are two problems.
462 * Firstly a bug in some versions of binutils meant PLT sections
463 * were not marked executable.
464 * Secondly the first word in the GOT section is blrl, used
465 * to establish the GOT address. Until recently the GOT was
466 * not marked executable.
470 if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
474 flush_dcache_page(pg);
477 void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
478 unsigned long addr, int len)
482 maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
483 flush_icache_range(maddr, maddr + len);
486 EXPORT_SYMBOL(flush_icache_user_range);
489 * This is called at the end of handling a user page fault, when the
490 * fault has been handled by updating a PTE in the linux page tables.
491 * We use it to preload an HPTE into the hash table corresponding to
492 * the updated linux PTE.
494 * This must always be called with the pte lock held.
496 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
499 #ifdef CONFIG_PPC_STD_MMU
500 unsigned long access = 0, trap;
502 /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
503 if (!pte_young(pte) || address >= TASK_SIZE)
506 /* We try to figure out if we are coming from an instruction
507 * access fault and pass that down to __hash_page so we avoid
508 * double-faulting on execution of fresh text. We have to test
509 * for regs NULL since init will get here first thing at boot
511 * We also avoid filling the hash if not coming from a fault
513 if (current->thread.regs == NULL)
515 trap = TRAP(current->thread.regs);
517 access |= _PAGE_EXEC;
518 else if (trap != 0x300)
520 hash_preload(vma->vm_mm, address, access, trap);
521 #endif /* CONFIG_PPC_STD_MMU */