#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/slab.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/paravirt.h>
#include <asm/setup.h>
#include <asm/cacheflush.h>
-#include <asm/smp.h>
+#include <asm/page_types.h>
+#include <asm/init.h>
-unsigned int __VMALLOC_RESERVE = 128 << 20;
-
-unsigned long max_low_pfn_mapped;
-unsigned long max_pfn_mapped;
-
-DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
unsigned long highstart_pfn, highend_pfn;
static noinline int do_test_wp_bit(void);
+bool __read_mostly __vmalloc_start_set = false;
-static unsigned long __initdata table_start;
-static unsigned long __meminitdata table_end;
-static unsigned long __meminitdata table_top;
-
-static int __initdata after_init_bootmem;
-
-static __init void *alloc_low_page(unsigned long *phys)
+static __init void *alloc_low_page(void)
{
- unsigned long pfn = table_end++;
+ unsigned long pfn = e820_table_end++;
void *adr;
- if (pfn >= table_top)
+ if (pfn >= e820_table_top)
panic("alloc_low_page: ran out of memory");
adr = __va(pfn * PAGE_SIZE);
memset(adr, 0, PAGE_SIZE);
- *phys = pfn * PAGE_SIZE;
return adr;
}
pmd_t *pmd_table;
#ifdef CONFIG_X86_PAE
- unsigned long phys;
if (!(pgd_val(*pgd) & _PAGE_PRESENT)) {
- if (after_init_bootmem)
- pmd_table = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE);
+ if (after_bootmem)
+ pmd_table = (pmd_t *)alloc_bootmem_pages(PAGE_SIZE);
else
- pmd_table = (pmd_t *)alloc_low_page(&phys);
+ 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);
if (!(pmd_val(*pmd) & _PAGE_PRESENT)) {
pte_t *page_table = NULL;
- if (after_init_bootmem) {
-#ifdef CONFIG_DEBUG_PAGEALLOC
+ 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_low_pages(PAGE_SIZE);
- } else {
- unsigned long phys;
- page_table = (pte_t *)alloc_low_page(&phys);
- }
+ (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));
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) < e820_table_start
+ || (__pa(pte) >> PAGE_SHIFT) >= e820_table_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
unsigned long vaddr;
pgd_t *pgd;
pmd_t *pmd;
+ pte_t *pte = NULL;
vaddr = start;
pgd_idx = pgd_index(vaddr);
pmd = pmd + pmd_index(vaddr);
for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end);
pmd++, pmd_idx++) {
- one_page_table_init(pmd);
+ pte = page_table_kmap_check(one_page_table_init(pmd),
+ pmd, vaddr, pte);
vaddr += PMD_SIZE;
}
* of max_low_pfn pages, by creating page tables starting from address
* PAGE_OFFSET:
*/
-static void __init kernel_physical_mapping_init(pgd_t *pgd_base,
- unsigned long start_pfn,
- unsigned long end_pfn,
- int use_pse)
+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;
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
prot = PAGE_KERNEL_EXEC;
pages_4k++;
- if (mapping_iter == 1)
+ if (mapping_iter == 1) {
set_pte(pte, pfn_pte(pfn, init_prot));
- else
+ last_map_addr = (pfn << PAGE_SHIFT) + PAGE_SIZE;
+ } else
set_pte(pte, pfn_pte(pfn, prot));
}
}
mapping_iter = 2;
goto repeat;
}
+ return last_map_addr;
}
-/*
- * devmem_is_allowed() checks to see if /dev/mem access to a certain address
- * is valid. The argument is a physical page number.
- *
- *
- * On x86, access has to be given to the first megabyte of ram because that area
- * contains bios code and data regions used by X and dosemu and similar apps.
- * Access has to be given to non-kernel-ram areas as well, these contain the PCI
- * mmio resources as well as potential bios/acpi data regions.
- */
-int devmem_is_allowed(unsigned long pagenr)
-{
- if (pagenr <= 256)
- return 1;
- if (!page_is_ram(pagenr))
- return 1;
- return 0;
-}
-
-#ifdef CONFIG_HIGHMEM
pte_t *kmap_pte;
pgprot_t kmap_prot;
kmap_prot = PAGE_KERNEL;
}
+#ifdef CONFIG_HIGHMEM
static void __init permanent_kmaps_init(pgd_t *pgd_base)
{
unsigned long vaddr;
pkmap_page_table = pte;
}
-static void __init add_one_highpage_init(struct page *page, int pfn)
+static void __init add_one_highpage_init(struct page *page)
{
ClearPageReserved(page);
init_page_count(page);
if (!pfn_valid(node_pfn))
continue;
page = pfn_to_page(node_pfn);
- add_one_highpage_init(page, node_pfn);
+ add_one_highpage_init(page);
}
return 0;
work_with_active_regions(nid, add_highpages_work_fn, &data);
}
-#ifndef CONFIG_NUMA
-static void __init set_highmem_pages_init(void)
+#else
+static inline void permanent_kmaps_init(pgd_t *pgd_base)
{
- add_highpages_with_active_regions(0, highstart_pfn, highend_pfn);
-
- totalram_pages += totalhigh_pages;
}
-#endif /* !CONFIG_NUMA */
-
-#else
-# define kmap_init() do { } while (0)
-# define permanent_kmaps_init(pgd_base) do { } while (0)
-# define set_highmem_pages_init() do { } while (0)
#endif /* CONFIG_HIGHMEM */
void __init native_pagetable_setup_start(pgd_t *base)
* be partially populated, and so it avoids stomping on any existing
* mappings.
*/
-static void __init early_ioremap_page_table_range_init(pgd_t *pgd_base)
+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():
*/
- early_ioremap_clear();
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);
}
#endif /* !CONFIG_ACPI_SLEEP */
-void zap_low_mappings(void)
+void zap_low_mappings(bool early)
{
int i;
set_pgd(swapper_pg_dir+i, __pgd(0));
#endif
}
- flush_tlb_all();
-}
-
-int nx_enabled;
-
-pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL);
-EXPORT_SYMBOL_GPL(__supported_pte_mask);
-
-#ifdef CONFIG_X86_PAE
-
-static int disable_nx __initdata;
-/*
- * noexec = on|off
- *
- * Control non executable mappings.
- *
- * on Enable
- * off Disable
- */
-static int __init noexec_setup(char *str)
-{
- if (!str || !strcmp(str, "on")) {
- if (cpu_has_nx) {
- __supported_pte_mask |= _PAGE_NX;
- disable_nx = 0;
- }
- } else {
- if (!strcmp(str, "off")) {
- disable_nx = 1;
- __supported_pte_mask &= ~_PAGE_NX;
- } else {
- return -EINVAL;
- }
- }
-
- return 0;
+ if (early)
+ __flush_tlb();
+ else
+ flush_tlb_all();
}
-early_param("noexec", noexec_setup);
-
-static void __init set_nx(void)
-{
- unsigned int v[4], l, h;
-
- if (cpu_has_pae && (cpuid_eax(0x80000000) > 0x80000001)) {
- cpuid(0x80000001, &v[0], &v[1], &v[2], &v[3]);
- if ((v[3] & (1 << 20)) && !disable_nx) {
- rdmsr(MSR_EFER, l, h);
- l |= EFER_NX;
- wrmsr(MSR_EFER, l, h);
- nx_enabled = 1;
- __supported_pte_mask |= _PAGE_NX;
- }
- }
-}
-#endif
+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;
}
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"
/*
- * Determine low and high memory ranges:
+ * All of RAM fits into lowmem - but if user wants highmem
+ * artificially via the highmem=x boot parameter then create
+ * it:
*/
-void __init find_low_pfn_range(void)
+void __init lowmem_pfn_init(void)
{
- /* it could update max_pfn */
-
/* max_low_pfn is 0, we already have early_res support */
-
max_low_pfn = max_pfn;
- if (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 "only %luMB highmem pages "
- "available, ignoring highmem size of %uMB.\n",
- pages_to_mb(max_pfn - MAXMEM_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 = MAXMEM_PFN;
+ 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;
+ /* 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 "Warning only 4GB will be used."
- "Use a HIGHMEM64G enabled kernel.\n");
- }
+ if (max_pfn > MAX_NONPAE_PFN) {
+ max_pfn = MAX_NONPAE_PFN;
+ printk(KERN_WARNING MSG_HIGHMEM_TRIMMED);
+ }
#endif /* !CONFIG_HIGHMEM64G */
#endif /* !CONFIG_HIGHMEM */
- } else {
- if (highmem_pages == -1)
- highmem_pages = 0;
-#ifdef CONFIG_HIGHMEM
- if (highmem_pages >= max_pfn) {
- printk(KERN_ERR "highmem size specified (%uMB) is "
- "bigger than pages available (%luMB)!.\n",
- 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 "highmem size %uMB results in "
- "smaller than 64MB lowmem, ignoring it.\n"
- , 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
- }
+}
+
+/*
+ * 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(unsigned long start_pfn,
- unsigned long end_pfn)
+void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn,
+ int acpi, int k8)
{
#ifdef CONFIG_HIGHMEM
highstart_pfn = highend_pfn = max_pfn;
if (max_pfn > max_low_pfn)
highstart_pfn = max_low_pfn;
- memory_present(0, 0, highend_pfn);
e820_register_active_regions(0, 0, highend_pfn);
+ sparse_memory_present_with_active_regions(0);
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
- memory_present(0, 0, max_low_pfn);
e820_register_active_regions(0, 0, max_low_pfn);
+ sparse_memory_present_with_active_regions(0);
num_physpages = max_low_pfn;
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
#endif
#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));
free_area_init_nodes(max_zone_pfns);
}
+#ifndef CONFIG_NO_BOOTMEM
+static unsigned long __init setup_node_bootmem(int nodeid,
+ unsigned long start_pfn,
+ unsigned long end_pfn,
+ unsigned long bootmap)
+{
+ unsigned long bootmap_size;
+
+ /* don't touch min_low_pfn */
+ bootmap_size = init_bootmem_node(NODE_DATA(nodeid),
+ bootmap >> PAGE_SHIFT,
+ start_pfn, end_pfn);
+ printk(KERN_INFO " node %d low ram: %08lx - %08lx\n",
+ nodeid, start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT);
+ printk(KERN_INFO " node %d bootmap %08lx - %08lx\n",
+ nodeid, bootmap, bootmap + bootmap_size);
+ free_bootmem_with_active_regions(nodeid, end_pfn);
+
+ return bootmap + bootmap_size;
+}
+#endif
+
void __init setup_bootmem_allocator(void)
{
- int i;
+#ifndef CONFIG_NO_BOOTMEM
+ int nodeid;
unsigned long bootmap_size, bootmap;
/*
* Initialize the boot-time allocator (with low memory only):
*/
bootmap_size = bootmem_bootmap_pages(max_low_pfn)<<PAGE_SHIFT;
- bootmap = find_e820_area(min_low_pfn<<PAGE_SHIFT,
- max_pfn_mapped<<PAGE_SHIFT, bootmap_size,
+ bootmap = find_e820_area(0, max_pfn_mapped<<PAGE_SHIFT, bootmap_size,
PAGE_SIZE);
if (bootmap == -1L)
panic("Cannot find bootmem map of size %ld\n", bootmap_size);
reserve_early(bootmap, bootmap + bootmap_size, "BOOTMAP");
+#endif
- /* don't touch min_low_pfn */
- bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT,
- min_low_pfn, max_low_pfn);
printk(KERN_INFO " mapped low ram: 0 - %08lx\n",
max_pfn_mapped<<PAGE_SHIFT);
- printk(KERN_INFO " low ram: %08lx - %08lx\n",
- min_low_pfn<<PAGE_SHIFT, max_low_pfn<<PAGE_SHIFT);
- printk(KERN_INFO " bootmap %08lx - %08lx\n",
- bootmap, bootmap + bootmap_size);
- for_each_online_node(i)
- free_bootmem_with_active_regions(i, max_low_pfn);
- early_res_to_bootmem(0, max_low_pfn<<PAGE_SHIFT);
-
- after_init_bootmem = 1;
-}
-
-static void __init find_early_table_space(unsigned long end, int use_pse)
-{
- unsigned long puds, pmds, ptes, tables, start;
-
- puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
- tables = PAGE_ALIGN(puds * sizeof(pud_t));
-
- pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
- tables += PAGE_ALIGN(pmds * sizeof(pmd_t));
-
- if (use_pse) {
- unsigned long extra;
-
- extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT);
- extra += PMD_SIZE;
- ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;
- } else
- ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ printk(KERN_INFO " low ram: 0 - %08lx\n", max_low_pfn<<PAGE_SHIFT);
- tables += PAGE_ALIGN(ptes * sizeof(pte_t));
+#ifndef CONFIG_NO_BOOTMEM
+ for_each_online_node(nodeid) {
+ unsigned long start_pfn, end_pfn;
- /* for fixmap */
- tables += PAGE_SIZE * 2;
-
- /*
- * RED-PEN putting page tables only on node 0 could
- * cause a hotspot and fill up ZONE_DMA. The page tables
- * need roughly 0.5KB per GB.
- */
- start = 0x7000;
- table_start = find_e820_area(start, max_pfn_mapped<<PAGE_SHIFT,
- tables, PAGE_SIZE);
- if (table_start == -1UL)
- panic("Cannot find space for the kernel page tables");
-
- table_start >>= PAGE_SHIFT;
- table_end = table_start;
- table_top = table_start + (tables>>PAGE_SHIFT);
-
- printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n",
- end, table_start << PAGE_SHIFT,
- (table_start << PAGE_SHIFT) + tables);
-}
-
-unsigned long __init_refok init_memory_mapping(unsigned long start,
- unsigned long end)
-{
- pgd_t *pgd_base = swapper_pg_dir;
- unsigned long start_pfn, end_pfn;
- unsigned long big_page_start;
-#ifdef CONFIG_DEBUG_PAGEALLOC
- /*
- * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages.
- * This will simplify cpa(), which otherwise needs to support splitting
- * large pages into small in interrupt context, etc.
- */
- int use_pse = 0;
+#ifdef CONFIG_NEED_MULTIPLE_NODES
+ start_pfn = node_start_pfn[nodeid];
+ end_pfn = node_end_pfn[nodeid];
+ if (start_pfn > max_low_pfn)
+ continue;
+ if (end_pfn > max_low_pfn)
+ end_pfn = max_low_pfn;
#else
- int use_pse = cpu_has_pse;
-#endif
-
- /*
- * Find space for the kernel direct mapping tables.
- */
- if (!after_init_bootmem)
- find_early_table_space(end, use_pse);
-
-#ifdef CONFIG_X86_PAE
- set_nx();
- if (nx_enabled)
- printk(KERN_INFO "NX (Execute Disable) protection: active\n");
+ start_pfn = 0;
+ end_pfn = max_low_pfn;
#endif
-
- /* Enable PSE if available */
- if (cpu_has_pse)
- set_in_cr4(X86_CR4_PSE);
-
- /* Enable PGE if available */
- if (cpu_has_pge) {
- set_in_cr4(X86_CR4_PGE);
- __supported_pte_mask |= _PAGE_GLOBAL;
- }
-
- /*
- * Don't use a large page for the first 2/4MB of memory
- * because there are often fixed size MTRRs in there
- * and overlapping MTRRs into large pages can cause
- * slowdowns.
- */
- big_page_start = PMD_SIZE;
-
- if (start < big_page_start) {
- start_pfn = start >> PAGE_SHIFT;
- end_pfn = min(big_page_start>>PAGE_SHIFT, end>>PAGE_SHIFT);
- } else {
- /* head is not big page alignment ? */
- start_pfn = start >> PAGE_SHIFT;
- end_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT)
- << (PMD_SHIFT - PAGE_SHIFT);
- }
- if (start_pfn < end_pfn)
- kernel_physical_mapping_init(pgd_base, start_pfn, end_pfn, 0);
-
- /* big page range */
- start_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT)
- << (PMD_SHIFT - PAGE_SHIFT);
- if (start_pfn < (big_page_start >> PAGE_SHIFT))
- start_pfn = big_page_start >> PAGE_SHIFT;
- end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
- if (start_pfn < end_pfn)
- kernel_physical_mapping_init(pgd_base, start_pfn, end_pfn,
- use_pse);
-
- /* tail is not big page alignment ? */
- start_pfn = end_pfn;
- if (start_pfn > (big_page_start>>PAGE_SHIFT)) {
- end_pfn = end >> PAGE_SHIFT;
- if (start_pfn < end_pfn)
- kernel_physical_mapping_init(pgd_base, start_pfn,
- end_pfn, 0);
+ bootmap = setup_node_bootmem(nodeid, start_pfn, end_pfn,
+ bootmap);
}
+#endif
- early_ioremap_page_table_range_init(pgd_base);
-
- load_cr3(swapper_pg_dir);
-
- __flush_tlb_all();
-
- if (!after_init_bootmem)
- reserve_early(table_start << PAGE_SHIFT,
- table_end << PAGE_SHIFT, "PGTABLE");
-
- if (!after_init_bootmem)
- early_memtest(start, end);
-
- return end >> PAGE_SHIFT;
+ after_bootmem = 1;
}
-
/*
* paging_init() sets up the page tables - note that the first 8MB are
* already mapped by head.S.
}
}
-static struct kcore_list kcore_mem, kcore_vmalloc;
-
void __init mem_init(void)
{
int codesize, reservedpages, datasize, initsize;
int tmp;
- start_periodic_check_for_corruption();
+ pci_iommu_alloc();
#ifdef CONFIG_FLATMEM
BUG_ON(!mem_map);
datasize = (unsigned long) &_edata - (unsigned long) &_etext;
initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
- kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
- kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
- VMALLOC_END-VMALLOC_START);
-
printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
"%dk reserved, %dk data, %dk init, %ldk highmem)\n",
- (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
+ nr_free_pages() << (PAGE_SHIFT-10),
num_physpages << (PAGE_SHIFT-10),
codesize >> 10,
reservedpages << (PAGE_SHIFT-10),
datasize >> 10,
initsize >> 10,
- (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10))
- );
+ totalhigh_pages << (PAGE_SHIFT-10));
printk(KERN_INFO "virtual kernel memory layout:\n"
" fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
(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(VMALLOC_START >= VMALLOC_END);
BUG_ON((unsigned long)high_memory > VMALLOC_START);
if (boot_cpu_data.wp_works_ok < 0)
test_wp_bit();
save_pg_dir();
- zap_low_mappings();
+ zap_low_mappings(true);
}
#ifdef CONFIG_MEMORY_HOTPLUG
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
- return __add_pages(zone, start_pfn, nr_pages);
+ return __add_pages(nid, zone, start_pfn, nr_pages);
}
#endif
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);
+}
+
void mark_rodata_ro(void)
{
unsigned long start = PFN_ALIGN(_text);
unsigned long size = PFN_ALIGN(_etext) - start;
-#ifndef CONFIG_DYNAMIC_FTRACE
- /* Dynamic tracing modifies the kernel text section */
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);
printk(KERN_INFO "Testing CPA: write protecting again\n");
set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT);
#endif
-#endif /* CONFIG_DYNAMIC_FTRACE */
start += size;
size = (unsigned long)__end_rodata - start;
}
#endif
-void free_init_pages(char *what, unsigned long begin, unsigned long end)
-{
-#ifdef CONFIG_DEBUG_PAGEALLOC
- /*
- * If debugging page accesses then do not free this memory but
- * mark them not present - any buggy init-section access will
- * create a kernel page fault:
- */
- printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n",
- begin, PAGE_ALIGN(end));
- set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
-#else
- unsigned long addr;
-
- /*
- * We just marked the kernel text read only above, now that
- * we are going to free part of that, we need to make that
- * writeable first.
- */
- set_memory_rw(begin, (end - begin) >> PAGE_SHIFT);
-
- for (addr = begin; addr < end; addr += PAGE_SIZE) {
- ClearPageReserved(virt_to_page(addr));
- init_page_count(virt_to_page(addr));
- memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
- free_page(addr);
- totalram_pages++;
- }
- printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
-#endif
-}
-
-void free_initmem(void)
-{
- free_init_pages("unused kernel memory",
- (unsigned long)(&__init_begin),
- (unsigned long)(&__init_end));
-}
-
-#ifdef CONFIG_BLK_DEV_INITRD
-void free_initrd_mem(unsigned long start, unsigned long end)
-{
- free_init_pages("initrd memory", start, end);
-}
-#endif
-
int __init reserve_bootmem_generic(unsigned long phys, unsigned long len,
int flags)
{
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff