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 * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
9 * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
11 * Derived from "arch/i386/mm/init.c"
12 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
21 #include <linux/config.h>
22 #include <linux/module.h>
23 #include <linux/sched.h>
24 #include <linux/kernel.h>
25 #include <linux/errno.h>
26 #include <linux/string.h>
27 #include <linux/types.h>
29 #include <linux/stddef.h>
30 #include <linux/init.h>
31 #include <linux/bootmem.h>
32 #include <linux/highmem.h>
33 #include <linux/initrd.h>
34 #include <linux/pagemap.h>
36 #include <asm/pgalloc.h>
39 #include <asm/mmu_context.h>
40 #include <asm/pgtable.h>
43 #include <asm/machdep.h>
44 #include <asm/btext.h>
48 #include <asm/sections.h>
55 #ifndef CPU_FTR_COHERENT_ICACHE
56 #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */
57 #define CPU_FTR_NOEXECUTE 0
60 int init_bootmem_done;
62 unsigned long memory_limit;
65 * This is called by /dev/mem to know if a given address has to
66 * be mapped non-cacheable or not
68 int page_is_ram(unsigned long pfn)
70 unsigned long paddr = (pfn << PAGE_SHIFT);
72 #ifndef CONFIG_PPC64 /* XXX for now */
73 return paddr < __pa(high_memory);
76 for (i=0; i < lmb.memory.cnt; i++) {
79 base = lmb.memory.region[i].base;
81 if ((paddr >= base) &&
82 (paddr < (base + lmb.memory.region[i].size))) {
90 EXPORT_SYMBOL(page_is_ram);
92 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
93 unsigned long size, pgprot_t vma_prot)
95 if (ppc_md.phys_mem_access_prot)
96 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
98 if (!page_is_ram(pfn))
99 vma_prot = __pgprot(pgprot_val(vma_prot)
100 | _PAGE_GUARDED | _PAGE_NO_CACHE);
103 EXPORT_SYMBOL(phys_mem_access_prot);
107 unsigned long total = 0, reserved = 0;
108 unsigned long shared = 0, cached = 0;
109 unsigned long highmem = 0;
114 printk("Mem-info:\n");
116 printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
117 for_each_pgdat(pgdat) {
118 for (i = 0; i < pgdat->node_spanned_pages; i++) {
119 page = pgdat_page_nr(pgdat, i);
121 if (PageHighMem(page))
123 if (PageReserved(page))
125 else if (PageSwapCache(page))
127 else if (page_count(page))
128 shared += page_count(page) - 1;
131 printk("%ld pages of RAM\n", total);
132 #ifdef CONFIG_HIGHMEM
133 printk("%ld pages of HIGHMEM\n", highmem);
135 printk("%ld reserved pages\n", reserved);
136 printk("%ld pages shared\n", shared);
137 printk("%ld pages swap cached\n", cached);
141 * Initialize the bootmem system and give it all the memory we
142 * have available. If we are using highmem, we only put the
143 * lowmem into the bootmem system.
145 #ifndef CONFIG_NEED_MULTIPLE_NODES
146 void __init do_init_bootmem(void)
149 unsigned long start, bootmap_pages;
150 unsigned long total_pages;
153 max_pfn = total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT;
154 #ifdef CONFIG_HIGHMEM
155 total_pages = total_lowmem >> PAGE_SHIFT;
159 * Find an area to use for the bootmem bitmap. Calculate the size of
160 * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE.
161 * Add 1 additional page in case the address isn't page-aligned.
163 bootmap_pages = bootmem_bootmap_pages(total_pages);
165 start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
168 boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages);
170 /* Add all physical memory to the bootmem map, mark each area
173 for (i = 0; i < lmb.memory.cnt; i++) {
174 unsigned long base = lmb.memory.region[i].base;
175 unsigned long size = lmb_size_bytes(&lmb.memory, i);
176 #ifdef CONFIG_HIGHMEM
177 if (base >= total_lowmem)
179 if (base + size > total_lowmem)
180 size = total_lowmem - base;
182 free_bootmem(base, size);
185 /* reserve the sections we're already using */
186 for (i = 0; i < lmb.reserved.cnt; i++)
187 reserve_bootmem(lmb.reserved.region[i].base,
188 lmb_size_bytes(&lmb.reserved, i));
190 /* XXX need to clip this if using highmem? */
191 for (i = 0; i < lmb.memory.cnt; i++)
192 memory_present(0, lmb_start_pfn(&lmb.memory, i),
193 lmb_end_pfn(&lmb.memory, i));
194 init_bootmem_done = 1;
198 * paging_init() sets up the page tables - in fact we've already done this.
200 void __init paging_init(void)
202 unsigned long zones_size[MAX_NR_ZONES];
203 unsigned long zholes_size[MAX_NR_ZONES];
204 unsigned long total_ram = lmb_phys_mem_size();
205 unsigned long top_of_ram = lmb_end_of_DRAM();
207 #ifdef CONFIG_HIGHMEM
208 map_page(PKMAP_BASE, 0, 0); /* XXX gross */
209 pkmap_page_table = pte_offset_kernel(pmd_offset(pgd_offset_k
210 (PKMAP_BASE), PKMAP_BASE), PKMAP_BASE);
211 map_page(KMAP_FIX_BEGIN, 0, 0); /* XXX gross */
212 kmap_pte = pte_offset_kernel(pmd_offset(pgd_offset_k
213 (KMAP_FIX_BEGIN), KMAP_FIX_BEGIN), KMAP_FIX_BEGIN);
214 kmap_prot = PAGE_KERNEL;
215 #endif /* CONFIG_HIGHMEM */
217 printk(KERN_INFO "Top of RAM: 0x%lx, Total RAM: 0x%lx\n",
218 top_of_ram, total_ram);
219 printk(KERN_INFO "Memory hole size: %ldMB\n",
220 (top_of_ram - total_ram) >> 20);
222 * All pages are DMA-able so we put them all in the DMA zone.
224 memset(zones_size, 0, sizeof(zones_size));
225 memset(zholes_size, 0, sizeof(zholes_size));
227 zones_size[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
228 zholes_size[ZONE_DMA] = (top_of_ram - total_ram) >> PAGE_SHIFT;
230 #ifdef CONFIG_HIGHMEM
231 zones_size[ZONE_DMA] = total_lowmem >> PAGE_SHIFT;
232 zones_size[ZONE_HIGHMEM] = (total_memory - total_lowmem) >> PAGE_SHIFT;
233 zholes_size[ZONE_HIGHMEM] = (top_of_ram - total_ram) >> PAGE_SHIFT;
235 zones_size[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
236 zholes_size[ZONE_DMA] = (top_of_ram - total_ram) >> PAGE_SHIFT;
237 #endif /* CONFIG_HIGHMEM */
239 free_area_init_node(0, NODE_DATA(0), zones_size,
240 __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size);
242 #endif /* ! CONFIG_NEED_MULTIPLE_NODES */
244 void __init mem_init(void)
246 #ifdef CONFIG_NEED_MULTIPLE_NODES
252 unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
254 num_physpages = max_pfn; /* RAM is assumed contiguous */
255 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
257 #ifdef CONFIG_NEED_MULTIPLE_NODES
258 for_each_online_node(nid) {
259 if (NODE_DATA(nid)->node_spanned_pages != 0) {
260 printk("freeing bootmem node %x\n", nid);
262 free_all_bootmem_node(NODE_DATA(nid));
266 max_mapnr = num_physpages;
267 totalram_pages += free_all_bootmem();
269 for_each_pgdat(pgdat) {
270 for (i = 0; i < pgdat->node_spanned_pages; i++) {
271 page = pgdat_page_nr(pgdat, i);
272 if (PageReserved(page))
277 codesize = (unsigned long)&_sdata - (unsigned long)&_stext;
278 datasize = (unsigned long)&__init_begin - (unsigned long)&_sdata;
279 initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
280 bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start;
282 #ifdef CONFIG_HIGHMEM
284 unsigned long pfn, highmem_mapnr;
286 highmem_mapnr = total_lowmem >> PAGE_SHIFT;
287 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
288 struct page *page = pfn_to_page(pfn);
290 ClearPageReserved(page);
291 set_page_count(page, 1);
295 totalram_pages += totalhigh_pages;
296 printk(KERN_INFO "High memory: %luk\n",
297 totalhigh_pages << (PAGE_SHIFT-10));
299 #endif /* CONFIG_HIGHMEM */
301 printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, "
302 "%luk reserved, %luk data, %luk bss, %luk init)\n",
303 (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
304 num_physpages << (PAGE_SHIFT-10),
306 reservedpages << (PAGE_SHIFT-10),
314 /* Initialize the vDSO */
320 * This is called when a page has been modified by the kernel.
321 * It just marks the page as not i-cache clean. We do the i-cache
322 * flush later when the page is given to a user process, if necessary.
324 void flush_dcache_page(struct page *page)
326 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
328 /* avoid an atomic op if possible */
329 if (test_bit(PG_arch_1, &page->flags))
330 clear_bit(PG_arch_1, &page->flags);
332 EXPORT_SYMBOL(flush_dcache_page);
334 void flush_dcache_icache_page(struct page *page)
337 void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE);
338 __flush_dcache_icache(start);
339 kunmap_atomic(start, KM_PPC_SYNC_ICACHE);
340 #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64)
341 /* On 8xx there is no need to kmap since highmem is not supported */
342 __flush_dcache_icache(page_address(page));
344 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
348 void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
352 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
355 * We shouldnt have to do this, but some versions of glibc
356 * require it (ld.so assumes zero filled pages are icache clean)
360 /* avoid an atomic op if possible */
361 if (test_bit(PG_arch_1, &pg->flags))
362 clear_bit(PG_arch_1, &pg->flags);
364 EXPORT_SYMBOL(clear_user_page);
366 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
369 copy_page(vto, vfrom);
372 * We should be able to use the following optimisation, however
373 * there are two problems.
374 * Firstly a bug in some versions of binutils meant PLT sections
375 * were not marked executable.
376 * Secondly the first word in the GOT section is blrl, used
377 * to establish the GOT address. Until recently the GOT was
378 * not marked executable.
382 if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
386 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
389 /* avoid an atomic op if possible */
390 if (test_bit(PG_arch_1, &pg->flags))
391 clear_bit(PG_arch_1, &pg->flags);
394 void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
395 unsigned long addr, int len)
399 maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
400 flush_icache_range(maddr, maddr + len);
403 EXPORT_SYMBOL(flush_icache_user_range);
406 * This is called at the end of handling a user page fault, when the
407 * fault has been handled by updating a PTE in the linux page tables.
408 * We use it to preload an HPTE into the hash table corresponding to
409 * the updated linux PTE.
411 * This must always be called with the mm->page_table_lock held
413 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
416 /* handle i-cache coherency */
417 unsigned long pfn = pte_pfn(pte);
429 /* handle i-cache coherency */
430 if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) &&
431 !cpu_has_feature(CPU_FTR_NOEXECUTE) &&
433 struct page *page = pfn_to_page(pfn);
434 if (!PageReserved(page)
435 && !test_bit(PG_arch_1, &page->flags)) {
436 if (vma->vm_mm == current->active_mm) {
438 /* On 8xx, cache control instructions (particularly
439 * "dcbst" from flush_dcache_icache) fault as write
440 * operation if there is an unpopulated TLB entry
441 * for the address in question. To workaround that,
442 * we invalidate the TLB here, thus avoiding dcbst
447 __flush_dcache_icache((void *) address);
449 flush_dcache_icache_page(page);
450 set_bit(PG_arch_1, &page->flags);
454 #ifdef CONFIG_PPC_STD_MMU
455 /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
456 if (!pte_young(pte) || address >= TASK_SIZE)
461 pmd = pmd_offset(pgd_offset(vma->vm_mm, address), address);
463 add_hash_page(vma->vm_mm->context, address, pmd_val(*pmd));
465 pgdir = vma->vm_mm->pgd;
469 ptep = find_linux_pte(pgdir, address);
473 vsid = get_vsid(vma->vm_mm->context.id, address);
475 local_irq_save(flags);
476 tmp = cpumask_of_cpu(smp_processor_id());
477 if (cpus_equal(vma->vm_mm->cpu_vm_mask, tmp))
480 __hash_page(address, 0, vsid, ptep, 0x300, local);
481 local_irq_restore(flags);