#include <linux/module.h>
#include <linux/memory_hotplug.h>
#include <linux/nmi.h>
+#include <linux/gfp.h>
#include <asm/processor.h>
+#include <asm/bios_ebda.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/kdebug.h>
#include <asm/numa.h>
#include <asm/cacheflush.h>
-
-/*
- * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
- * The direct mapping extends to max_pfn_mapped, so that we can directly access
- * apertures, ACPI and other tables without having to play with fixmaps.
- */
-unsigned long max_low_pfn_mapped;
-unsigned long max_pfn_mapped;
+#include <asm/init.h>
+#include <linux/bootmem.h>
static unsigned long dma_reserve __initdata;
-DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
-
-int direct_gbpages
-#ifdef CONFIG_DIRECT_GBPAGES
- = 1
-#endif
-;
-
static int __init parse_direct_gbpages_off(char *arg)
{
direct_gbpages = 0;
* around without checking the pgd every time.
*/
-int after_bootmem;
+pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP;
+EXPORT_SYMBOL_GPL(__supported_pte_mask);
+
+int force_personality32;
+
+/*
+ * noexec32=on|off
+ * Control non executable heap for 32bit processes.
+ * To control the stack too use noexec=off
+ *
+ * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default)
+ * off PROT_READ implies PROT_EXEC
+ */
+static int __init nonx32_setup(char *str)
+{
+ if (!strcmp(str, "on"))
+ force_personality32 &= ~READ_IMPLIES_EXEC;
+ else if (!strcmp(str, "off"))
+ force_personality32 |= READ_IMPLIES_EXEC;
+ return 1;
+}
+__setup("noexec32=", nonx32_setup);
/*
* NOTE: This function is marked __ref because it calls __init function
void *ptr;
if (after_bootmem)
- ptr = (void *) get_zeroed_page(GFP_ATOMIC);
+ ptr = (void *) get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK);
else
ptr = alloc_bootmem_pages(PAGE_SIZE);
return ptr;
}
-void
-set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
+static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr)
{
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
+ if (pgd_none(*pgd)) {
+ pud_t *pud = (pud_t *)spp_getpage();
+ pgd_populate(&init_mm, pgd, pud);
+ if (pud != pud_offset(pgd, 0))
+ printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n",
+ pud, pud_offset(pgd, 0));
+ }
+ return pud_offset(pgd, vaddr);
+}
- pud = pud_page + pud_index(vaddr);
+static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr)
+{
if (pud_none(*pud)) {
- pmd = (pmd_t *) spp_getpage();
+ pmd_t *pmd = (pmd_t *) spp_getpage();
pud_populate(&init_mm, pud, pmd);
- if (pmd != pmd_offset(pud, 0)) {
+ if (pmd != pmd_offset(pud, 0))
printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
- pmd, pmd_offset(pud, 0));
- return;
- }
+ pmd, pmd_offset(pud, 0));
}
- pmd = pmd_offset(pud, vaddr);
+ return pmd_offset(pud, vaddr);
+}
+
+static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr)
+{
if (pmd_none(*pmd)) {
- pte = (pte_t *) spp_getpage();
+ pte_t *pte = (pte_t *) spp_getpage();
pmd_populate_kernel(&init_mm, pmd, pte);
- if (pte != pte_offset_kernel(pmd, 0)) {
+ if (pte != pte_offset_kernel(pmd, 0))
printk(KERN_ERR "PAGETABLE BUG #02!\n");
- return;
- }
}
+ return pte_offset_kernel(pmd, vaddr);
+}
+
+void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
+{
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+
+ pud = pud_page + pud_index(vaddr);
+ pmd = fill_pmd(pud, vaddr);
+ pte = fill_pte(pmd, vaddr);
- pte = pte_offset_kernel(pmd, vaddr);
- if (!pte_none(*pte) && pte_val(new_pte) &&
- pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask))
- pte_ERROR(*pte);
set_pte(pte, new_pte);
/*
__flush_tlb_one(vaddr);
}
-void
-set_pte_vaddr(unsigned long vaddr, pte_t pteval)
+void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
{
pgd_t *pgd;
pud_t *pud_page;
set_pte_vaddr_pud(pud_page, vaddr, pteval);
}
+pmd_t * __init populate_extra_pmd(unsigned long vaddr)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+
+ pgd = pgd_offset_k(vaddr);
+ pud = fill_pud(pgd, vaddr);
+ return fill_pmd(pud, vaddr);
+}
+
+pte_t * __init populate_extra_pte(unsigned long vaddr)
+{
+ pmd_t *pmd;
+
+ pmd = populate_extra_pmd(vaddr);
+ return fill_pte(pmd, vaddr);
+}
+
/*
* Create large page table mappings for a range of physical addresses.
*/
void __init cleanup_highmap(void)
{
unsigned long vaddr = __START_KERNEL_map;
- unsigned long end = round_up((unsigned long)_end, PMD_SIZE) - 1;
+ unsigned long end = roundup((unsigned long)_end, PMD_SIZE) - 1;
pmd_t *pmd = level2_kernel_pgt;
pmd_t *last_pmd = pmd + PTRS_PER_PMD;
}
}
-static unsigned long __initdata table_start;
-static unsigned long __meminitdata table_end;
-static unsigned long __meminitdata table_top;
-
static __ref void *alloc_low_page(unsigned long *phys)
{
- unsigned long pfn = table_end++;
+ unsigned long pfn = e820_table_end++;
void *adr;
if (after_bootmem) {
- adr = (void *)get_zeroed_page(GFP_ATOMIC);
+ adr = (void *)get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK);
*phys = __pa(adr);
return adr;
}
- if (pfn >= table_top)
+ if (pfn >= e820_table_top)
panic("alloc_low_page: ran out of memory");
- adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE);
+ adr = early_memremap(pfn * PAGE_SIZE, PAGE_SIZE);
memset(adr, 0, PAGE_SIZE);
*phys = pfn * PAGE_SIZE;
return adr;
}
static unsigned long __meminit
-phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end)
+phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end,
+ pgprot_t prot)
{
unsigned pages = 0;
unsigned long last_map_addr = end;
break;
}
- if (pte_val(*pte))
+ /*
+ * We will re-use the existing mapping.
+ * Xen for example has some special requirements, like mapping
+ * pagetable pages as RO. So assume someone who pre-setup
+ * these mappings are more intelligent.
+ */
+ if (pte_val(*pte)) {
+ pages++;
continue;
+ }
if (0)
printk(" pte=%p addr=%lx pte=%016lx\n",
pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte);
- set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL));
- last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE;
pages++;
+ set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot));
+ last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE;
}
+
update_page_count(PG_LEVEL_4K, pages);
return last_map_addr;
}
static unsigned long __meminit
-phys_pte_update(pmd_t *pmd, unsigned long address, unsigned long end)
+phys_pte_update(pmd_t *pmd, unsigned long address, unsigned long end,
+ pgprot_t prot)
{
pte_t *pte = (pte_t *)pmd_page_vaddr(*pmd);
- return phys_pte_init(pte, address, end);
+ return phys_pte_init(pte, address, end, prot);
}
static unsigned long __meminit
phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end,
- unsigned long page_size_mask)
+ unsigned long page_size_mask, pgprot_t prot)
{
unsigned long pages = 0;
unsigned long last_map_addr = end;
- unsigned long start = address;
int i = pmd_index(address);
unsigned long pte_phys;
pmd_t *pmd = pmd_page + pmd_index(address);
pte_t *pte;
+ pgprot_t new_prot = prot;
if (address >= end) {
if (!after_bootmem) {
if (!pmd_large(*pmd)) {
spin_lock(&init_mm.page_table_lock);
last_map_addr = phys_pte_update(pmd, address,
- end);
+ end, prot);
spin_unlock(&init_mm.page_table_lock);
+ continue;
}
- /* Count entries we're using from level2_ident_pgt */
- if (start == 0)
+ /*
+ * If we are ok with PG_LEVEL_2M mapping, then we will
+ * use the existing mapping,
+ *
+ * Otherwise, we will split the large page mapping but
+ * use the same existing protection bits except for
+ * large page, so that we don't violate Intel's TLB
+ * Application note (317080) which says, while changing
+ * the page sizes, new and old translations should
+ * not differ with respect to page frame and
+ * attributes.
+ */
+ if (page_size_mask & (1 << PG_LEVEL_2M)) {
pages++;
- continue;
+ continue;
+ }
+ new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd));
}
if (page_size_mask & (1<<PG_LEVEL_2M)) {
pages++;
spin_lock(&init_mm.page_table_lock);
set_pte((pte_t *)pmd,
- pfn_pte(address >> PAGE_SHIFT, PAGE_KERNEL_LARGE));
+ pfn_pte(address >> PAGE_SHIFT,
+ __pgprot(pgprot_val(prot) | _PAGE_PSE)));
spin_unlock(&init_mm.page_table_lock);
last_map_addr = (address & PMD_MASK) + PMD_SIZE;
continue;
}
pte = alloc_low_page(&pte_phys);
- last_map_addr = phys_pte_init(pte, address, end);
+ last_map_addr = phys_pte_init(pte, address, end, new_prot);
unmap_low_page(pte);
spin_lock(&init_mm.page_table_lock);
static unsigned long __meminit
phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end,
- unsigned long page_size_mask)
+ unsigned long page_size_mask, pgprot_t prot)
{
pmd_t *pmd = pmd_offset(pud, 0);
unsigned long last_map_addr;
- last_map_addr = phys_pmd_init(pmd, address, end, page_size_mask);
+ last_map_addr = phys_pmd_init(pmd, address, end, page_size_mask, prot);
__flush_tlb_all();
return last_map_addr;
}
unsigned long pmd_phys;
pud_t *pud = pud_page + pud_index(addr);
pmd_t *pmd;
+ pgprot_t prot = PAGE_KERNEL;
if (addr >= end)
break;
}
if (pud_val(*pud)) {
- if (!pud_large(*pud))
+ if (!pud_large(*pud)) {
last_map_addr = phys_pmd_update(pud, addr, end,
- page_size_mask);
- continue;
+ page_size_mask, prot);
+ continue;
+ }
+ /*
+ * If we are ok with PG_LEVEL_1G mapping, then we will
+ * use the existing mapping.
+ *
+ * Otherwise, we will split the gbpage mapping but use
+ * the same existing protection bits except for large
+ * page, so that we don't violate Intel's TLB
+ * Application note (317080) which says, while changing
+ * the page sizes, new and old translations should
+ * not differ with respect to page frame and
+ * attributes.
+ */
+ if (page_size_mask & (1 << PG_LEVEL_1G)) {
+ pages++;
+ continue;
+ }
+ prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud));
}
if (page_size_mask & (1<<PG_LEVEL_1G)) {
}
pmd = alloc_low_page(&pmd_phys);
- last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask);
+ last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask,
+ prot);
unmap_low_page(pmd);
spin_lock(&init_mm.page_table_lock);
spin_unlock(&init_mm.page_table_lock);
}
__flush_tlb_all();
+
update_page_count(PG_LEVEL_1G, pages);
return last_map_addr;
return phys_pud_init(pud, addr, end, page_size_mask);
}
-static void __init find_early_table_space(unsigned long end)
-{
- unsigned long puds, pmds, ptes, tables, start;
-
- puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
- tables = round_up(puds * sizeof(pud_t), PAGE_SIZE);
- if (direct_gbpages) {
- unsigned long extra;
- extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT);
- pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT;
- } else
- pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
- tables += round_up(pmds * sizeof(pmd_t), PAGE_SIZE);
-
- if (cpu_has_pse) {
- unsigned long extra;
- extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT);
- ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;
- } else
- ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
- tables += round_up(ptes * sizeof(pte_t), PAGE_SIZE);
-
- /*
- * 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 = 0x8000;
- table_start = find_e820_area(start, end, 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_top << PAGE_SHIFT);
-}
-
-static void __init init_gbpages(void)
-{
- if (direct_gbpages && cpu_has_gbpages)
- printk(KERN_INFO "Using GB pages for direct mapping\n");
- else
- direct_gbpages = 0;
-}
-
-static unsigned long __init kernel_physical_mapping_init(unsigned long start,
- unsigned long end,
- unsigned long page_size_mask)
+unsigned long __meminit
+kernel_physical_mapping_init(unsigned long start,
+ unsigned long end,
+ unsigned long page_size_mask)
{
unsigned long next, last_map_addr = end;
pgd_populate(&init_mm, pgd, __va(pud_phys));
spin_unlock(&init_mm.page_table_lock);
}
-
- return last_map_addr;
-}
-
-struct map_range {
- unsigned long start;
- unsigned long end;
- unsigned page_size_mask;
-};
-
-#define NR_RANGE_MR 5
-
-static int save_mr(struct map_range *mr, int nr_range,
- unsigned long start_pfn, unsigned long end_pfn,
- unsigned long page_size_mask)
-{
-
- if (start_pfn < end_pfn) {
- if (nr_range >= NR_RANGE_MR)
- panic("run out of range for init_memory_mapping\n");
- mr[nr_range].start = start_pfn<<PAGE_SHIFT;
- mr[nr_range].end = end_pfn<<PAGE_SHIFT;
- mr[nr_range].page_size_mask = page_size_mask;
- nr_range++;
- }
-
- return nr_range;
-}
-
-/*
- * Setup the direct mapping of the physical memory at PAGE_OFFSET.
- * This runs before bootmem is initialized and gets pages directly from
- * the physical memory. To access them they are temporarily mapped.
- */
-unsigned long __init_refok init_memory_mapping(unsigned long start,
- unsigned long end)
-{
- unsigned long last_map_addr = 0;
- unsigned long page_size_mask = 0;
- unsigned long start_pfn, end_pfn;
-
- struct map_range mr[NR_RANGE_MR];
- int nr_range, i;
-
- printk(KERN_INFO "init_memory_mapping\n");
-
- /*
- * Find space for the kernel direct mapping tables.
- *
- * Later we should allocate these tables in the local node of the
- * memory mapped. Unfortunately this is done currently before the
- * nodes are discovered.
- */
- if (!after_bootmem)
- init_gbpages();
-
- if (direct_gbpages)
- page_size_mask |= 1 << PG_LEVEL_1G;
- if (cpu_has_pse)
- page_size_mask |= 1 << PG_LEVEL_2M;
-
- memset(mr, 0, sizeof(mr));
- nr_range = 0;
-
- /* head if not big page alignment ?*/
- start_pfn = start >> PAGE_SHIFT;
- end_pfn = ((start + (PMD_SIZE - 1)) >> PMD_SHIFT)
- << (PMD_SHIFT - PAGE_SHIFT);
- nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
-
- /* big page (2M) range*/
- start_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT)
- << (PMD_SHIFT - PAGE_SHIFT);
- end_pfn = ((start + (PUD_SIZE - 1))>>PUD_SHIFT)
- << (PUD_SHIFT - PAGE_SHIFT);
- if (end_pfn > ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT)))
- end_pfn = ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT));
- nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
- page_size_mask & (1<<PG_LEVEL_2M));
-
- /* big page (1G) range */
- start_pfn = end_pfn;
- end_pfn = (end>>PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT);
- nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
- page_size_mask &
- ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G)));
-
- /* tail is not big page (1G) alignment */
- start_pfn = end_pfn;
- end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
- nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
- page_size_mask & (1<<PG_LEVEL_2M));
-
- /* tail is not big page (2M) alignment */
- start_pfn = end_pfn;
- end_pfn = end>>PAGE_SHIFT;
- nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
-
- /* try to merge same page size and continuous */
- for (i = 0; nr_range > 1 && i < nr_range - 1; i++) {
- unsigned long old_start;
- if (mr[i].end != mr[i+1].start ||
- mr[i].page_size_mask != mr[i+1].page_size_mask)
- continue;
- /* move it */
- old_start = mr[i].start;
- memmove(&mr[i], &mr[i+1],
- (nr_range - 1 - i) * sizeof (struct map_range));
- mr[i].start = old_start;
- nr_range--;
- }
-
- for (i = 0; i < nr_range; i++)
- printk(KERN_DEBUG " %010lx - %010lx page %s\n",
- mr[i].start, mr[i].end,
- (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":(
- (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k"));
-
- if (!after_bootmem)
- find_early_table_space(end);
-
- for (i = 0; i < nr_range; i++)
- last_map_addr = kernel_physical_mapping_init(
- mr[i].start, mr[i].end,
- mr[i].page_size_mask);
-
- if (!after_bootmem)
- mmu_cr4_features = read_cr4();
__flush_tlb_all();
- if (!after_bootmem && table_end > table_start)
- reserve_early(table_start << PAGE_SHIFT,
- table_end << PAGE_SHIFT, "PGTABLE");
-
- printk(KERN_INFO "last_map_addr: %lx end: %lx\n",
- last_map_addr, end);
-
- if (!after_bootmem)
- early_memtest(start, end);
-
- return last_map_addr >> PAGE_SHIFT;
+ return last_map_addr;
}
#ifndef CONFIG_NUMA
-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)
{
+#ifndef CONFIG_NO_BOOTMEM
unsigned long bootmap_size, bootmap;
bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
PAGE_SIZE);
if (bootmap == -1L)
panic("Cannot find bootmem map of size %ld\n", bootmap_size);
+ reserve_early(bootmap, bootmap + bootmap_size, "BOOTMAP");
/* don't touch min_low_pfn */
bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT,
0, end_pfn);
e820_register_active_regions(0, start_pfn, end_pfn);
free_bootmem_with_active_regions(0, end_pfn);
- early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT);
- reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT);
+#else
+ e820_register_active_regions(0, start_pfn, end_pfn);
+#endif
}
+#endif
void __init paging_init(void)
{
max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
max_zone_pfns[ZONE_NORMAL] = max_pfn;
- memory_present(0, 0, max_pfn);
+ sparse_memory_present_with_active_regions(MAX_NUMNODES);
sparse_init();
+
+ /*
+ * clear the default setting with node 0
+ * note: don't use nodes_clear here, that is really clearing when
+ * numa support is not compiled in, and later node_set_state
+ * will not set it back.
+ */
+ node_clear_state(0, N_NORMAL_MEMORY);
+
free_area_init_nodes(max_zone_pfns);
}
-#endif
/*
* Memory hotplug specific functions
*/
#ifdef CONFIG_MEMORY_HOTPLUG
/*
+ * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need
+ * updating.
+ */
+static void update_end_of_memory_vars(u64 start, u64 size)
+{
+ unsigned long end_pfn = PFN_UP(start + size);
+
+ if (end_pfn > max_pfn) {
+ max_pfn = end_pfn;
+ max_low_pfn = end_pfn;
+ high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
+ }
+}
+
+/*
* Memory is added always to NORMAL zone. This means you will never get
* additional DMA/DMA32 memory.
*/
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;
- last_mapped_pfn = init_memory_mapping(start, start + size-1);
+ last_mapped_pfn = init_memory_mapping(start, start + size);
if (last_mapped_pfn > max_pfn_mapped)
max_pfn_mapped = last_mapped_pfn;
- ret = __add_pages(zone, start_pfn, nr_pages);
- WARN_ON(1);
+ ret = __add_pages(nid, zone, start_pfn, nr_pages);
+ WARN_ON_ONCE(ret);
+
+ /* update max_pfn, max_low_pfn and high_memory */
+ update_end_of_memory_vars(start, size);
return ret;
}
#endif /* CONFIG_MEMORY_HOTPLUG */
-/*
- * 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;
-}
-
-
-static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel,
- kcore_modules, kcore_vsyscall;
+static struct kcore_list kcore_vsyscall;
void __init mem_init(void)
{
long codesize, reservedpages, datasize, initsize;
-
- start_periodic_check_for_corruption();
+ unsigned long absent_pages;
pci_iommu_alloc();
#else
totalram_pages = free_all_bootmem();
#endif
- reservedpages = max_pfn - totalram_pages -
- absent_pages_in_range(0, max_pfn);
+
+ absent_pages = absent_pages_in_range(0, max_pfn);
+ reservedpages = max_pfn - totalram_pages - absent_pages;
after_bootmem = 1;
codesize = (unsigned long) &_etext - (unsigned long) &_text;
initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
/* Register memory areas for /proc/kcore */
- kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
- kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
- VMALLOC_END-VMALLOC_START);
- kclist_add(&kcore_kernel, &_stext, _end - _stext);
- kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN);
kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START,
- VSYSCALL_END - VSYSCALL_START);
+ VSYSCALL_END - VSYSCALL_START, KCORE_OTHER);
printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
- "%ldk reserved, %ldk data, %ldk init)\n",
- (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
+ "%ldk absent, %ldk reserved, %ldk data, %ldk init)\n",
+ nr_free_pages() << (PAGE_SHIFT-10),
max_pfn << (PAGE_SHIFT-10),
codesize >> 10,
+ absent_pages << (PAGE_SHIFT-10),
reservedpages << (PAGE_SHIFT-10),
datasize >> 10,
initsize >> 10);
-
- cpa_init();
}
-void free_init_pages(char *what, unsigned long begin, unsigned long end)
+#ifdef CONFIG_DEBUG_RODATA
+const int rodata_test_data = 0xC3;
+EXPORT_SYMBOL_GPL(rodata_test_data);
+
+int kernel_set_to_readonly;
+
+void set_kernel_text_rw(void)
{
- unsigned long addr = begin;
+ unsigned long start = PFN_ALIGN(_text);
+ unsigned long end = PFN_ALIGN(__stop___ex_table);
- if (addr >= end)
+ if (!kernel_set_to_readonly)
return;
+ pr_debug("Set kernel text: %lx - %lx for read write\n",
+ start, end);
+
/*
- * 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:
+ * Make the kernel identity mapping for text RW. Kernel text
+ * mapping will always be RO. Refer to the comment in
+ * static_protections() in pageattr.c
*/
-#ifdef CONFIG_DEBUG_PAGEALLOC
- printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n",
- begin, PAGE_ALIGN(end));
- set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
-#else
- printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
-
- for (; addr < end; addr += PAGE_SIZE) {
- ClearPageReserved(virt_to_page(addr));
- init_page_count(virt_to_page(addr));
- memset((void *)(addr & ~(PAGE_SIZE-1)),
- POISON_FREE_INITMEM, PAGE_SIZE);
- free_page(addr);
- totalram_pages++;
- }
-#endif
+ set_memory_rw(start, (end - start) >> PAGE_SHIFT);
}
-void free_initmem(void)
+void set_kernel_text_ro(void)
{
- free_init_pages("unused kernel memory",
- (unsigned long)(&__init_begin),
- (unsigned long)(&__init_end));
-}
+ unsigned long start = PFN_ALIGN(_text);
+ unsigned long end = PFN_ALIGN(__stop___ex_table);
-#ifdef CONFIG_DEBUG_RODATA
-const int rodata_test_data = 0xC3;
-EXPORT_SYMBOL_GPL(rodata_test_data);
+ if (!kernel_set_to_readonly)
+ return;
+
+ pr_debug("Set kernel text: %lx - %lx for read only\n",
+ start, end);
+
+ /*
+ * Set the kernel identity mapping for text RO.
+ */
+ set_memory_ro(start, (end - start) >> PAGE_SHIFT);
+}
void mark_rodata_ro(void)
{
- unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata);
+ unsigned long start = PFN_ALIGN(_text);
unsigned long rodata_start =
((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK;
-
-#ifdef CONFIG_DYNAMIC_FTRACE
- /* Dynamic tracing modifies the kernel text section */
- start = rodata_start;
-#endif
+ unsigned long end = (unsigned long) &__end_rodata_hpage_align;
+ unsigned long text_end = PAGE_ALIGN((unsigned long) &__stop___ex_table);
+ unsigned long rodata_end = PAGE_ALIGN((unsigned long) &__end_rodata);
+ unsigned long data_start = (unsigned long) &_sdata;
printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
(end - start) >> 10);
set_memory_ro(start, (end - start) >> PAGE_SHIFT);
+ kernel_set_to_readonly = 1;
+
/*
* The rodata section (but not the kernel text!) should also be
* not-executable.
printk(KERN_INFO "Testing CPA: again\n");
set_memory_ro(start, (end-start) >> PAGE_SHIFT);
#endif
-}
-
-#endif
-#ifdef CONFIG_BLK_DEV_INITRD
-void free_initrd_mem(unsigned long start, unsigned long end)
-{
- free_init_pages("initrd memory", start, end);
+ free_init_pages("unused kernel memory",
+ (unsigned long) page_address(virt_to_page(text_end)),
+ (unsigned long)
+ page_address(virt_to_page(rodata_start)));
+ free_init_pages("unused kernel memory",
+ (unsigned long) page_address(virt_to_page(rodata_end)),
+ (unsigned long) page_address(virt_to_page(data_start)));
}
+
#endif
int __init reserve_bootmem_generic(unsigned long phys, unsigned long len,
return ret;
#else
- reserve_bootmem(phys, len, BOOTMEM_DEFAULT);
+ reserve_bootmem(phys, len, flags);
#endif
if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) {
if (pmd_none(*pmd)) {
pte_t entry;
- p = vmemmap_alloc_block(PMD_SIZE, node);
+ p = vmemmap_alloc_block_buf(PMD_SIZE, node);
if (!p)
return -ENOMEM;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff