diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/x86/mm/init_32.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/x86/mm/init_32.c | 959 |
1 files changed, 0 insertions, 959 deletions
diff --git a/ANDROID_3.4.5/arch/x86/mm/init_32.c b/ANDROID_3.4.5/arch/x86/mm/init_32.c deleted file mode 100644 index 575d86f8..00000000 --- a/ANDROID_3.4.5/arch/x86/mm/init_32.c +++ /dev/null @@ -1,959 +0,0 @@ -/* - * - * Copyright (C) 1995 Linus Torvalds - * - * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 - */ - -#include <linux/module.h> -#include <linux/signal.h> -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/string.h> -#include <linux/types.h> -#include <linux/ptrace.h> -#include <linux/mman.h> -#include <linux/mm.h> -#include <linux/hugetlb.h> -#include <linux/swap.h> -#include <linux/smp.h> -#include <linux/init.h> -#include <linux/highmem.h> -#include <linux/pagemap.h> -#include <linux/pci.h> -#include <linux/pfn.h> -#include <linux/poison.h> -#include <linux/bootmem.h> -#include <linux/memblock.h> -#include <linux/proc_fs.h> -#include <linux/memory_hotplug.h> -#include <linux/initrd.h> -#include <linux/cpumask.h> -#include <linux/gfp.h> - -#include <asm/asm.h> -#include <asm/bios_ebda.h> -#include <asm/processor.h> -#include <asm/uaccess.h> -#include <asm/pgtable.h> -#include <asm/dma.h> -#include <asm/fixmap.h> -#include <asm/e820.h> -#include <asm/apic.h> -#include <asm/bugs.h> -#include <asm/tlb.h> -#include <asm/tlbflush.h> -#include <asm/olpc_ofw.h> -#include <asm/pgalloc.h> -#include <asm/sections.h> -#include <asm/paravirt.h> -#include <asm/setup.h> -#include <asm/cacheflush.h> -#include <asm/page_types.h> -#include <asm/init.h> - -unsigned long highstart_pfn, highend_pfn; - -static noinline int do_test_wp_bit(void); - -bool __read_mostly __vmalloc_start_set = false; - -static __init void *alloc_low_page(void) -{ - unsigned long pfn = pgt_buf_end++; - void *adr; - - if (pfn >= pgt_buf_top) - panic("alloc_low_page: ran out of memory"); - - adr = __va(pfn * PAGE_SIZE); - clear_page(adr); - return adr; -} - -/* - * Creates a middle page table and puts a pointer to it in the - * given global directory entry. This only returns the gd entry - * in non-PAE compilation mode, since the middle layer is folded. - */ -static pmd_t * __init one_md_table_init(pgd_t *pgd) -{ - pud_t *pud; - pmd_t *pmd_table; - -#ifdef CONFIG_X86_PAE - if (!(pgd_val(*pgd) & _PAGE_PRESENT)) { - if (after_bootmem) - pmd_table = (pmd_t *)alloc_bootmem_pages(PAGE_SIZE); - else - pmd_table = (pmd_t *)alloc_low_page(); - paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT); - set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT)); - pud = pud_offset(pgd, 0); - BUG_ON(pmd_table != pmd_offset(pud, 0)); - - return pmd_table; - } -#endif - pud = pud_offset(pgd, 0); - pmd_table = pmd_offset(pud, 0); - - return pmd_table; -} - -/* - * Create a page table and place a pointer to it in a middle page - * directory entry: - */ -static pte_t * __init one_page_table_init(pmd_t *pmd) -{ - if (!(pmd_val(*pmd) & _PAGE_PRESENT)) { - pte_t *page_table = NULL; - - if (after_bootmem) { -#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK) - page_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE); -#endif - if (!page_table) - page_table = - (pte_t *)alloc_bootmem_pages(PAGE_SIZE); - } else - page_table = (pte_t *)alloc_low_page(); - - paravirt_alloc_pte(&init_mm, __pa(page_table) >> PAGE_SHIFT); - set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE)); - BUG_ON(page_table != pte_offset_kernel(pmd, 0)); - } - - return pte_offset_kernel(pmd, 0); -} - -pmd_t * __init populate_extra_pmd(unsigned long vaddr) -{ - int pgd_idx = pgd_index(vaddr); - int pmd_idx = pmd_index(vaddr); - - return one_md_table_init(swapper_pg_dir + pgd_idx) + pmd_idx; -} - -pte_t * __init populate_extra_pte(unsigned long vaddr) -{ - int pte_idx = pte_index(vaddr); - pmd_t *pmd; - - pmd = populate_extra_pmd(vaddr); - return one_page_table_init(pmd) + pte_idx; -} - -static pte_t *__init page_table_kmap_check(pte_t *pte, pmd_t *pmd, - unsigned long vaddr, pte_t *lastpte) -{ -#ifdef CONFIG_HIGHMEM - /* - * Something (early fixmap) may already have put a pte - * page here, which causes the page table allocation - * to become nonlinear. Attempt to fix it, and if it - * is still nonlinear then we have to bug. - */ - int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT; - int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT; - - if (pmd_idx_kmap_begin != pmd_idx_kmap_end - && (vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin - && (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end - && ((__pa(pte) >> PAGE_SHIFT) < pgt_buf_start - || (__pa(pte) >> PAGE_SHIFT) >= pgt_buf_end)) { - pte_t *newpte; - int i; - - BUG_ON(after_bootmem); - newpte = alloc_low_page(); - for (i = 0; i < PTRS_PER_PTE; i++) - set_pte(newpte + i, pte[i]); - - paravirt_alloc_pte(&init_mm, __pa(newpte) >> PAGE_SHIFT); - set_pmd(pmd, __pmd(__pa(newpte)|_PAGE_TABLE)); - BUG_ON(newpte != pte_offset_kernel(pmd, 0)); - __flush_tlb_all(); - - paravirt_release_pte(__pa(pte) >> PAGE_SHIFT); - pte = newpte; - } - BUG_ON(vaddr < fix_to_virt(FIX_KMAP_BEGIN - 1) - && vaddr > fix_to_virt(FIX_KMAP_END) - && lastpte && lastpte + PTRS_PER_PTE != pte); -#endif - return pte; -} - -/* - * This function initializes a certain range of kernel virtual memory - * with new bootmem page tables, everywhere page tables are missing in - * the given range. - * - * NOTE: The pagetables are allocated contiguous on the physical space - * so we can cache the place of the first one and move around without - * checking the pgd every time. - */ -static void __init -page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base) -{ - int pgd_idx, pmd_idx; - unsigned long vaddr; - pgd_t *pgd; - pmd_t *pmd; - pte_t *pte = NULL; - - vaddr = start; - pgd_idx = pgd_index(vaddr); - pmd_idx = pmd_index(vaddr); - pgd = pgd_base + pgd_idx; - - for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) { - pmd = one_md_table_init(pgd); - pmd = pmd + pmd_index(vaddr); - for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); - pmd++, pmd_idx++) { - pte = page_table_kmap_check(one_page_table_init(pmd), - pmd, vaddr, pte); - - vaddr += PMD_SIZE; - } - pmd_idx = 0; - } -} - -static inline int is_kernel_text(unsigned long addr) -{ - if (addr >= (unsigned long)_text && addr <= (unsigned long)__init_end) - return 1; - return 0; -} - -/* - * This maps the physical memory to kernel virtual address space, a total - * of max_low_pfn pages, by creating page tables starting from address - * PAGE_OFFSET: - */ -unsigned long __init -kernel_physical_mapping_init(unsigned long start, - unsigned long end, - unsigned long page_size_mask) -{ - int use_pse = page_size_mask == (1<<PG_LEVEL_2M); - unsigned long last_map_addr = end; - unsigned long start_pfn, end_pfn; - pgd_t *pgd_base = swapper_pg_dir; - int pgd_idx, pmd_idx, pte_ofs; - unsigned long pfn; - pgd_t *pgd; - pmd_t *pmd; - pte_t *pte; - unsigned pages_2m, pages_4k; - int mapping_iter; - - start_pfn = start >> PAGE_SHIFT; - end_pfn = end >> PAGE_SHIFT; - - /* - * First iteration will setup identity mapping using large/small pages - * based on use_pse, with other attributes same as set by - * the early code in head_32.S - * - * Second iteration will setup the appropriate attributes (NX, GLOBAL..) - * as desired for the kernel identity mapping. - * - * This two pass mechanism conforms to the TLB app note which says: - * - * "Software should not write to a paging-structure entry in a way - * that would change, for any linear address, both the page size - * and either the page frame or attributes." - */ - mapping_iter = 1; - - if (!cpu_has_pse) - use_pse = 0; - -repeat: - pages_2m = pages_4k = 0; - pfn = start_pfn; - pgd_idx = pgd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); - pgd = pgd_base + pgd_idx; - for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) { - pmd = one_md_table_init(pgd); - - if (pfn >= end_pfn) - continue; -#ifdef CONFIG_X86_PAE - pmd_idx = pmd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); - pmd += pmd_idx; -#else - pmd_idx = 0; -#endif - for (; pmd_idx < PTRS_PER_PMD && pfn < end_pfn; - pmd++, pmd_idx++) { - unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET; - - /* - * Map with big pages if possible, otherwise - * create normal page tables: - */ - if (use_pse) { - unsigned int addr2; - pgprot_t prot = PAGE_KERNEL_LARGE; - /* - * first pass will use the same initial - * identity mapping attribute + _PAGE_PSE. - */ - pgprot_t init_prot = - __pgprot(PTE_IDENT_ATTR | - _PAGE_PSE); - - addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE + - PAGE_OFFSET + PAGE_SIZE-1; - - if (is_kernel_text(addr) || - is_kernel_text(addr2)) - prot = PAGE_KERNEL_LARGE_EXEC; - - pages_2m++; - if (mapping_iter == 1) - set_pmd(pmd, pfn_pmd(pfn, init_prot)); - else - set_pmd(pmd, pfn_pmd(pfn, prot)); - - pfn += PTRS_PER_PTE; - continue; - } - pte = one_page_table_init(pmd); - - pte_ofs = pte_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); - pte += pte_ofs; - for (; pte_ofs < PTRS_PER_PTE && pfn < end_pfn; - pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) { - pgprot_t prot = PAGE_KERNEL; - /* - * first pass will use the same initial - * identity mapping attribute. - */ - pgprot_t init_prot = __pgprot(PTE_IDENT_ATTR); - - if (is_kernel_text(addr)) - prot = PAGE_KERNEL_EXEC; - - pages_4k++; - if (mapping_iter == 1) { - set_pte(pte, pfn_pte(pfn, init_prot)); - last_map_addr = (pfn << PAGE_SHIFT) + PAGE_SIZE; - } else - set_pte(pte, pfn_pte(pfn, prot)); - } - } - } - if (mapping_iter == 1) { - /* - * update direct mapping page count only in the first - * iteration. - */ - update_page_count(PG_LEVEL_2M, pages_2m); - update_page_count(PG_LEVEL_4K, pages_4k); - - /* - * local global flush tlb, which will flush the previous - * mappings present in both small and large page TLB's. - */ - __flush_tlb_all(); - - /* - * Second iteration will set the actual desired PTE attributes. - */ - mapping_iter = 2; - goto repeat; - } - return last_map_addr; -} - -pte_t *kmap_pte; -pgprot_t kmap_prot; - -static inline pte_t *kmap_get_fixmap_pte(unsigned long vaddr) -{ - return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), - vaddr), vaddr), vaddr); -} - -static void __init kmap_init(void) -{ - unsigned long kmap_vstart; - - /* - * Cache the first kmap pte: - */ - kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); - kmap_pte = kmap_get_fixmap_pte(kmap_vstart); - - kmap_prot = PAGE_KERNEL; -} - -#ifdef CONFIG_HIGHMEM -static void __init permanent_kmaps_init(pgd_t *pgd_base) -{ - unsigned long vaddr; - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd; - pte_t *pte; - - vaddr = PKMAP_BASE; - page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); - - pgd = swapper_pg_dir + pgd_index(vaddr); - pud = pud_offset(pgd, vaddr); - pmd = pmd_offset(pud, vaddr); - pte = pte_offset_kernel(pmd, vaddr); - pkmap_page_table = pte; -} - -static void __init add_one_highpage_init(struct page *page) -{ - ClearPageReserved(page); - init_page_count(page); - __free_page(page); - totalhigh_pages++; -} - -void __init add_highpages_with_active_regions(int nid, - unsigned long start_pfn, unsigned long end_pfn) -{ - phys_addr_t start, end; - u64 i; - - for_each_free_mem_range(i, nid, &start, &end, NULL) { - unsigned long pfn = clamp_t(unsigned long, PFN_UP(start), - start_pfn, end_pfn); - unsigned long e_pfn = clamp_t(unsigned long, PFN_DOWN(end), - start_pfn, end_pfn); - for ( ; pfn < e_pfn; pfn++) - if (pfn_valid(pfn)) - add_one_highpage_init(pfn_to_page(pfn)); - } -} -#else -static inline void permanent_kmaps_init(pgd_t *pgd_base) -{ -} -#endif /* CONFIG_HIGHMEM */ - -void __init native_pagetable_setup_start(pgd_t *base) -{ - unsigned long pfn, va; - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd; - pte_t *pte; - - /* - * Remove any mappings which extend past the end of physical - * memory from the boot time page table: - */ - for (pfn = max_low_pfn + 1; pfn < 1<<(32-PAGE_SHIFT); pfn++) { - va = PAGE_OFFSET + (pfn<<PAGE_SHIFT); - pgd = base + pgd_index(va); - if (!pgd_present(*pgd)) - break; - - pud = pud_offset(pgd, va); - pmd = pmd_offset(pud, va); - if (!pmd_present(*pmd)) - break; - - pte = pte_offset_kernel(pmd, va); - if (!pte_present(*pte)) - break; - - pte_clear(NULL, va, pte); - } - paravirt_alloc_pmd(&init_mm, __pa(base) >> PAGE_SHIFT); -} - -void __init native_pagetable_setup_done(pgd_t *base) -{ -} - -/* - * Build a proper pagetable for the kernel mappings. Up until this - * point, we've been running on some set of pagetables constructed by - * the boot process. - * - * If we're booting on native hardware, this will be a pagetable - * constructed in arch/x86/kernel/head_32.S. The root of the - * pagetable will be swapper_pg_dir. - * - * If we're booting paravirtualized under a hypervisor, then there are - * more options: we may already be running PAE, and the pagetable may - * or may not be based in swapper_pg_dir. In any case, - * paravirt_pagetable_setup_start() will set up swapper_pg_dir - * appropriately for the rest of the initialization to work. - * - * In general, pagetable_init() assumes that the pagetable may already - * be partially populated, and so it avoids stomping on any existing - * mappings. - */ -void __init early_ioremap_page_table_range_init(void) -{ - pgd_t *pgd_base = swapper_pg_dir; - unsigned long vaddr, end; - - /* - * Fixed mappings, only the page table structure has to be - * created - mappings will be set by set_fixmap(): - */ - vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; - end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; - page_table_range_init(vaddr, end, pgd_base); - early_ioremap_reset(); -} - -static void __init pagetable_init(void) -{ - pgd_t *pgd_base = swapper_pg_dir; - - permanent_kmaps_init(pgd_base); -} - -pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL | _PAGE_IOMAP); -EXPORT_SYMBOL_GPL(__supported_pte_mask); - -/* user-defined highmem size */ -static unsigned int highmem_pages = -1; - -/* - * highmem=size forces highmem to be exactly 'size' bytes. - * This works even on boxes that have no highmem otherwise. - * This also works to reduce highmem size on bigger boxes. - */ -static int __init parse_highmem(char *arg) -{ - if (!arg) - return -EINVAL; - - highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT; - return 0; -} -early_param("highmem", parse_highmem); - -#define MSG_HIGHMEM_TOO_BIG \ - "highmem size (%luMB) is bigger than pages available (%luMB)!\n" - -#define MSG_LOWMEM_TOO_SMALL \ - "highmem size (%luMB) results in <64MB lowmem, ignoring it!\n" -/* - * All of RAM fits into lowmem - but if user wants highmem - * artificially via the highmem=x boot parameter then create - * it: - */ -void __init lowmem_pfn_init(void) -{ - /* max_low_pfn is 0, we already have early_res support */ - max_low_pfn = max_pfn; - - if (highmem_pages == -1) - highmem_pages = 0; -#ifdef CONFIG_HIGHMEM - if (highmem_pages >= max_pfn) { - printk(KERN_ERR MSG_HIGHMEM_TOO_BIG, - pages_to_mb(highmem_pages), pages_to_mb(max_pfn)); - highmem_pages = 0; - } - if (highmem_pages) { - if (max_low_pfn - highmem_pages < 64*1024*1024/PAGE_SIZE) { - printk(KERN_ERR MSG_LOWMEM_TOO_SMALL, - pages_to_mb(highmem_pages)); - highmem_pages = 0; - } - max_low_pfn -= highmem_pages; - } -#else - if (highmem_pages) - printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n"); -#endif -} - -#define MSG_HIGHMEM_TOO_SMALL \ - "only %luMB highmem pages available, ignoring highmem size of %luMB!\n" - -#define MSG_HIGHMEM_TRIMMED \ - "Warning: only 4GB will be used. Use a HIGHMEM64G enabled kernel!\n" -/* - * We have more RAM than fits into lowmem - we try to put it into - * highmem, also taking the highmem=x boot parameter into account: - */ -void __init highmem_pfn_init(void) -{ - max_low_pfn = MAXMEM_PFN; - - if (highmem_pages == -1) - highmem_pages = max_pfn - MAXMEM_PFN; - - if (highmem_pages + MAXMEM_PFN < max_pfn) - max_pfn = MAXMEM_PFN + highmem_pages; - - if (highmem_pages + MAXMEM_PFN > max_pfn) { - printk(KERN_WARNING MSG_HIGHMEM_TOO_SMALL, - pages_to_mb(max_pfn - MAXMEM_PFN), - pages_to_mb(highmem_pages)); - highmem_pages = 0; - } -#ifndef CONFIG_HIGHMEM - /* Maximum memory usable is what is directly addressable */ - printk(KERN_WARNING "Warning only %ldMB will be used.\n", MAXMEM>>20); - if (max_pfn > MAX_NONPAE_PFN) - printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n"); - else - printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n"); - max_pfn = MAXMEM_PFN; -#else /* !CONFIG_HIGHMEM */ -#ifndef CONFIG_HIGHMEM64G - if (max_pfn > MAX_NONPAE_PFN) { - max_pfn = MAX_NONPAE_PFN; - printk(KERN_WARNING MSG_HIGHMEM_TRIMMED); - } -#endif /* !CONFIG_HIGHMEM64G */ -#endif /* !CONFIG_HIGHMEM */ -} - -/* - * Determine low and high memory ranges: - */ -void __init find_low_pfn_range(void) -{ - /* it could update max_pfn */ - - if (max_pfn <= MAXMEM_PFN) - lowmem_pfn_init(); - else - highmem_pfn_init(); -} - -#ifndef CONFIG_NEED_MULTIPLE_NODES -void __init initmem_init(void) -{ -#ifdef CONFIG_HIGHMEM - highstart_pfn = highend_pfn = max_pfn; - if (max_pfn > max_low_pfn) - highstart_pfn = max_low_pfn; - printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", - pages_to_mb(highend_pfn - highstart_pfn)); - num_physpages = highend_pfn; - high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1; -#else - num_physpages = max_low_pfn; - high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1; -#endif - - memblock_set_node(0, (phys_addr_t)ULLONG_MAX, 0); - sparse_memory_present_with_active_regions(0); - -#ifdef CONFIG_FLATMEM - max_mapnr = num_physpages; -#endif - __vmalloc_start_set = true; - - printk(KERN_NOTICE "%ldMB LOWMEM available.\n", - pages_to_mb(max_low_pfn)); - - setup_bootmem_allocator(); -} -#endif /* !CONFIG_NEED_MULTIPLE_NODES */ - -void __init setup_bootmem_allocator(void) -{ - printk(KERN_INFO " mapped low ram: 0 - %08lx\n", - max_pfn_mapped<<PAGE_SHIFT); - printk(KERN_INFO " low ram: 0 - %08lx\n", max_low_pfn<<PAGE_SHIFT); - - after_bootmem = 1; -} - -/* - * paging_init() sets up the page tables - note that the first 8MB are - * already mapped by head.S. - * - * This routines also unmaps the page at virtual kernel address 0, so - * that we can trap those pesky NULL-reference errors in the kernel. - */ -void __init paging_init(void) -{ - pagetable_init(); - - __flush_tlb_all(); - - kmap_init(); - - /* - * NOTE: at this point the bootmem allocator is fully available. - */ - olpc_dt_build_devicetree(); - sparse_memory_present_with_active_regions(MAX_NUMNODES); - sparse_init(); - zone_sizes_init(); -} - -/* - * Test if the WP bit works in supervisor mode. It isn't supported on 386's - * and also on some strange 486's. All 586+'s are OK. This used to involve - * black magic jumps to work around some nasty CPU bugs, but fortunately the - * switch to using exceptions got rid of all that. - */ -static void __init test_wp_bit(void) -{ - printk(KERN_INFO - "Checking if this processor honours the WP bit even in supervisor mode..."); - - /* Any page-aligned address will do, the test is non-destructive */ - __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_READONLY); - boot_cpu_data.wp_works_ok = do_test_wp_bit(); - clear_fixmap(FIX_WP_TEST); - - if (!boot_cpu_data.wp_works_ok) { - printk(KERN_CONT "No.\n"); -#ifdef CONFIG_X86_WP_WORKS_OK - panic( - "This kernel doesn't support CPU's with broken WP. Recompile it for a 386!"); -#endif - } else { - printk(KERN_CONT "Ok.\n"); - } -} - -void __init mem_init(void) -{ - int codesize, reservedpages, datasize, initsize; - int tmp; - - pci_iommu_alloc(); - -#ifdef CONFIG_FLATMEM - BUG_ON(!mem_map); -#endif - /* - * With CONFIG_DEBUG_PAGEALLOC initialization of highmem pages has to - * be done before free_all_bootmem(). Memblock use free low memory for - * temporary data (see find_range_array()) and for this purpose can use - * pages that was already passed to the buddy allocator, hence marked as - * not accessible in the page tables when compiled with - * CONFIG_DEBUG_PAGEALLOC. Otherwise order of initialization is not - * important here. - */ - set_highmem_pages_init(); - - /* this will put all low memory onto the freelists */ - totalram_pages += free_all_bootmem(); - - reservedpages = 0; - for (tmp = 0; tmp < max_low_pfn; tmp++) - /* - * Only count reserved RAM pages: - */ - if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp))) - reservedpages++; - - codesize = (unsigned long) &_etext - (unsigned long) &_text; - datasize = (unsigned long) &_edata - (unsigned long) &_etext; - initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; - - printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " - "%dk reserved, %dk data, %dk init, %ldk highmem)\n", - nr_free_pages() << (PAGE_SHIFT-10), - num_physpages << (PAGE_SHIFT-10), - codesize >> 10, - reservedpages << (PAGE_SHIFT-10), - datasize >> 10, - initsize >> 10, - totalhigh_pages << (PAGE_SHIFT-10)); - - printk(KERN_INFO "virtual kernel memory layout:\n" - " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" -#ifdef CONFIG_HIGHMEM - " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" -#endif - " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" - " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" - " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" - " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" - " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", - FIXADDR_START, FIXADDR_TOP, - (FIXADDR_TOP - FIXADDR_START) >> 10, - -#ifdef CONFIG_HIGHMEM - PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, - (LAST_PKMAP*PAGE_SIZE) >> 10, -#endif - - VMALLOC_START, VMALLOC_END, - (VMALLOC_END - VMALLOC_START) >> 20, - - (unsigned long)__va(0), (unsigned long)high_memory, - ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20, - - (unsigned long)&__init_begin, (unsigned long)&__init_end, - ((unsigned long)&__init_end - - (unsigned long)&__init_begin) >> 10, - - (unsigned long)&_etext, (unsigned long)&_edata, - ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, - - (unsigned long)&_text, (unsigned long)&_etext, - ((unsigned long)&_etext - (unsigned long)&_text) >> 10); - - /* - * Check boundaries twice: Some fundamental inconsistencies can - * be detected at build time already. - */ -#define __FIXADDR_TOP (-PAGE_SIZE) -#ifdef CONFIG_HIGHMEM - BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START); - BUILD_BUG_ON(VMALLOC_END > PKMAP_BASE); -#endif -#define high_memory (-128UL << 20) - BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END); -#undef high_memory -#undef __FIXADDR_TOP - -#ifdef CONFIG_HIGHMEM - BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START); - BUG_ON(VMALLOC_END > PKMAP_BASE); -#endif - BUG_ON(VMALLOC_START >= VMALLOC_END); - BUG_ON((unsigned long)high_memory > VMALLOC_START); - - if (boot_cpu_data.wp_works_ok < 0) - test_wp_bit(); -} - -#ifdef CONFIG_MEMORY_HOTPLUG -int arch_add_memory(int nid, u64 start, u64 size) -{ - struct pglist_data *pgdata = NODE_DATA(nid); - struct zone *zone = pgdata->node_zones + ZONE_HIGHMEM; - unsigned long start_pfn = start >> PAGE_SHIFT; - unsigned long nr_pages = size >> PAGE_SHIFT; - - return __add_pages(nid, zone, start_pfn, nr_pages); -} -#endif - -/* - * This function cannot be __init, since exceptions don't work in that - * section. Put this after the callers, so that it cannot be inlined. - */ -static noinline int do_test_wp_bit(void) -{ - char tmp_reg; - int flag; - - __asm__ __volatile__( - " movb %0, %1 \n" - "1: movb %1, %0 \n" - " xorl %2, %2 \n" - "2: \n" - _ASM_EXTABLE(1b,2b) - :"=m" (*(char *)fix_to_virt(FIX_WP_TEST)), - "=q" (tmp_reg), - "=r" (flag) - :"2" (1) - :"memory"); - - return flag; -} - -#ifdef CONFIG_DEBUG_RODATA -const int rodata_test_data = 0xC3; -EXPORT_SYMBOL_GPL(rodata_test_data); - -int kernel_set_to_readonly __read_mostly; - -void set_kernel_text_rw(void) -{ - unsigned long start = PFN_ALIGN(_text); - unsigned long size = PFN_ALIGN(_etext) - start; - - if (!kernel_set_to_readonly) - return; - - pr_debug("Set kernel text: %lx - %lx for read write\n", - start, start+size); - - set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT); -} - -void set_kernel_text_ro(void) -{ - unsigned long start = PFN_ALIGN(_text); - unsigned long size = PFN_ALIGN(_etext) - start; - - if (!kernel_set_to_readonly) - return; - - pr_debug("Set kernel text: %lx - %lx for read only\n", - start, start+size); - - set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); -} - -static void mark_nxdata_nx(void) -{ - /* - * When this called, init has already been executed and released, - * so everything past _etext should be NX. - */ - unsigned long start = PFN_ALIGN(_etext); - /* - * This comes from is_kernel_text upper limit. Also HPAGE where used: - */ - unsigned long size = (((unsigned long)__init_end + HPAGE_SIZE) & HPAGE_MASK) - start; - - if (__supported_pte_mask & _PAGE_NX) - printk(KERN_INFO "NX-protecting the kernel data: %luk\n", size >> 10); - set_pages_nx(virt_to_page(start), size >> PAGE_SHIFT); -} - -void mark_rodata_ro(void) -{ - unsigned long start = PFN_ALIGN(_text); - unsigned long size = PFN_ALIGN(_etext) - start; - - set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); - printk(KERN_INFO "Write protecting the kernel text: %luk\n", - size >> 10); - - kernel_set_to_readonly = 1; - -#ifdef CONFIG_CPA_DEBUG - printk(KERN_INFO "Testing CPA: Reverting %lx-%lx\n", - start, start+size); - set_pages_rw(virt_to_page(start), size>>PAGE_SHIFT); - - printk(KERN_INFO "Testing CPA: write protecting again\n"); - set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT); -#endif - - start += size; - size = (unsigned long)__end_rodata - start; - set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); - printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", - size >> 10); - rodata_test(); - -#ifdef CONFIG_CPA_DEBUG - printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, start + size); - set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT); - - printk(KERN_INFO "Testing CPA: write protecting again\n"); - set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); -#endif - mark_nxdata_nx(); -} -#endif - |