forked from Minki/linux
bf7e6a1963
When using memmap kernel parameter in EFI boot we should also add to memory map memory regions of runtime services to enable their mapping later. AK: merged and cleaned up the patch Signed-off-by: Artiom Myaskouvskey <artiom.myaskouvskey@intel.com> Signed-off-by: Andi Kleen <ak@suse.de>
802 lines
20 KiB
C
802 lines
20 KiB
C
/*
|
|
* linux/arch/i386/mm/init.c
|
|
*
|
|
* 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/poison.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/efi.h>
|
|
#include <linux/memory_hotplug.h>
|
|
#include <linux/initrd.h>
|
|
#include <linux/cpumask.h>
|
|
|
|
#include <asm/processor.h>
|
|
#include <asm/system.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/tlb.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/sections.h>
|
|
|
|
unsigned int __VMALLOC_RESERVE = 128 << 20;
|
|
|
|
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
|
|
unsigned long highstart_pfn, highend_pfn;
|
|
|
|
static int noinline do_test_wp_bit(void);
|
|
|
|
/*
|
|
* 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
|
|
pmd_table = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE);
|
|
set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT));
|
|
pud = pud_offset(pgd, 0);
|
|
if (pmd_table != pmd_offset(pud, 0))
|
|
BUG();
|
|
#else
|
|
pud = pud_offset(pgd, 0);
|
|
pmd_table = pmd_offset(pud, 0);
|
|
#endif
|
|
|
|
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_none(*pmd)) {
|
|
pte_t *page_table = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
|
|
set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE));
|
|
if (page_table != pte_offset_kernel(pmd, 0))
|
|
BUG();
|
|
|
|
return page_table;
|
|
}
|
|
|
|
return pte_offset_kernel(pmd, 0);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
pgd_t *pgd;
|
|
pud_t *pud;
|
|
pmd_t *pmd;
|
|
int pgd_idx, pmd_idx;
|
|
unsigned long vaddr;
|
|
|
|
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++) {
|
|
if (pgd_none(*pgd))
|
|
one_md_table_init(pgd);
|
|
pud = pud_offset(pgd, vaddr);
|
|
pmd = pmd_offset(pud, vaddr);
|
|
for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); pmd++, pmd_idx++) {
|
|
if (pmd_none(*pmd))
|
|
one_page_table_init(pmd);
|
|
|
|
vaddr += PMD_SIZE;
|
|
}
|
|
pmd_idx = 0;
|
|
}
|
|
}
|
|
|
|
static inline int is_kernel_text(unsigned long addr)
|
|
{
|
|
if (addr >= PAGE_OFFSET && 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.
|
|
*/
|
|
static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
|
|
{
|
|
unsigned long pfn;
|
|
pgd_t *pgd;
|
|
pmd_t *pmd;
|
|
pte_t *pte;
|
|
int pgd_idx, pmd_idx, pte_ofs;
|
|
|
|
pgd_idx = pgd_index(PAGE_OFFSET);
|
|
pgd = pgd_base + pgd_idx;
|
|
pfn = 0;
|
|
|
|
for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) {
|
|
pmd = one_md_table_init(pgd);
|
|
if (pfn >= max_low_pfn)
|
|
continue;
|
|
for (pmd_idx = 0; pmd_idx < PTRS_PER_PMD && pfn < max_low_pfn; pmd++, pmd_idx++) {
|
|
unsigned int address = pfn * PAGE_SIZE + PAGE_OFFSET;
|
|
|
|
/* Map with big pages if possible, otherwise create normal page tables. */
|
|
if (cpu_has_pse) {
|
|
unsigned int address2 = (pfn + PTRS_PER_PTE - 1) * PAGE_SIZE + PAGE_OFFSET + PAGE_SIZE-1;
|
|
|
|
if (is_kernel_text(address) || is_kernel_text(address2))
|
|
set_pmd(pmd, pfn_pmd(pfn, PAGE_KERNEL_LARGE_EXEC));
|
|
else
|
|
set_pmd(pmd, pfn_pmd(pfn, PAGE_KERNEL_LARGE));
|
|
pfn += PTRS_PER_PTE;
|
|
} else {
|
|
pte = one_page_table_init(pmd);
|
|
|
|
for (pte_ofs = 0; pte_ofs < PTRS_PER_PTE && pfn < max_low_pfn; pte++, pfn++, pte_ofs++) {
|
|
if (is_kernel_text(address))
|
|
set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC));
|
|
else
|
|
set_pte(pte, pfn_pte(pfn, PAGE_KERNEL));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline int page_kills_ppro(unsigned long pagenr)
|
|
{
|
|
if (pagenr >= 0x70000 && pagenr <= 0x7003F)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
int page_is_ram(unsigned long pagenr)
|
|
{
|
|
int i;
|
|
unsigned long addr, end;
|
|
|
|
if (efi_enabled) {
|
|
efi_memory_desc_t *md;
|
|
void *p;
|
|
|
|
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
|
|
md = p;
|
|
if (!is_available_memory(md))
|
|
continue;
|
|
addr = (md->phys_addr+PAGE_SIZE-1) >> PAGE_SHIFT;
|
|
end = (md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT)) >> PAGE_SHIFT;
|
|
|
|
if ((pagenr >= addr) && (pagenr < end))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
for (i = 0; i < e820.nr_map; i++) {
|
|
|
|
if (e820.map[i].type != E820_RAM) /* not usable memory */
|
|
continue;
|
|
/*
|
|
* !!!FIXME!!! Some BIOSen report areas as RAM that
|
|
* are not. Notably the 640->1Mb area. We need a sanity
|
|
* check here.
|
|
*/
|
|
addr = (e820.map[i].addr+PAGE_SIZE-1) >> PAGE_SHIFT;
|
|
end = (e820.map[i].addr+e820.map[i].size) >> PAGE_SHIFT;
|
|
if ((pagenr >= addr) && (pagenr < end))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
pte_t *kmap_pte;
|
|
pgprot_t kmap_prot;
|
|
|
|
#define kmap_get_fixmap_pte(vaddr) \
|
|
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;
|
|
}
|
|
|
|
static void __init permanent_kmaps_init(pgd_t *pgd_base)
|
|
{
|
|
pgd_t *pgd;
|
|
pud_t *pud;
|
|
pmd_t *pmd;
|
|
pte_t *pte;
|
|
unsigned long vaddr;
|
|
|
|
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 __meminit free_new_highpage(struct page *page)
|
|
{
|
|
init_page_count(page);
|
|
__free_page(page);
|
|
totalhigh_pages++;
|
|
}
|
|
|
|
void __init add_one_highpage_init(struct page *page, int pfn, int bad_ppro)
|
|
{
|
|
if (page_is_ram(pfn) && !(bad_ppro && page_kills_ppro(pfn))) {
|
|
ClearPageReserved(page);
|
|
free_new_highpage(page);
|
|
} else
|
|
SetPageReserved(page);
|
|
}
|
|
|
|
static int add_one_highpage_hotplug(struct page *page, unsigned long pfn)
|
|
{
|
|
free_new_highpage(page);
|
|
totalram_pages++;
|
|
#ifdef CONFIG_FLATMEM
|
|
max_mapnr = max(pfn, max_mapnr);
|
|
#endif
|
|
num_physpages++;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Not currently handling the NUMA case.
|
|
* Assuming single node and all memory that
|
|
* has been added dynamically that would be
|
|
* onlined here is in HIGHMEM
|
|
*/
|
|
void online_page(struct page *page)
|
|
{
|
|
ClearPageReserved(page);
|
|
add_one_highpage_hotplug(page, page_to_pfn(page));
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_NUMA
|
|
extern void set_highmem_pages_init(int);
|
|
#else
|
|
static void __init set_highmem_pages_init(int bad_ppro)
|
|
{
|
|
int pfn;
|
|
for (pfn = highstart_pfn; pfn < highend_pfn; pfn++)
|
|
add_one_highpage_init(pfn_to_page(pfn), pfn, bad_ppro);
|
|
totalram_pages += totalhigh_pages;
|
|
}
|
|
#endif /* CONFIG_FLATMEM */
|
|
|
|
#else
|
|
#define kmap_init() do { } while (0)
|
|
#define permanent_kmaps_init(pgd_base) do { } while (0)
|
|
#define set_highmem_pages_init(bad_ppro) do { } while (0)
|
|
#endif /* CONFIG_HIGHMEM */
|
|
|
|
unsigned long long __PAGE_KERNEL = _PAGE_KERNEL;
|
|
EXPORT_SYMBOL(__PAGE_KERNEL);
|
|
unsigned long long __PAGE_KERNEL_EXEC = _PAGE_KERNEL_EXEC;
|
|
|
|
#ifdef CONFIG_NUMA
|
|
extern void __init remap_numa_kva(void);
|
|
#else
|
|
#define remap_numa_kva() do {} while (0)
|
|
#endif
|
|
|
|
static void __init pagetable_init (void)
|
|
{
|
|
unsigned long vaddr;
|
|
pgd_t *pgd_base = swapper_pg_dir;
|
|
|
|
#ifdef CONFIG_X86_PAE
|
|
int i;
|
|
/* Init entries of the first-level page table to the zero page */
|
|
for (i = 0; i < PTRS_PER_PGD; i++)
|
|
set_pgd(pgd_base + i, __pgd(__pa(empty_zero_page) | _PAGE_PRESENT));
|
|
#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);
|
|
__PAGE_KERNEL |= _PAGE_GLOBAL;
|
|
__PAGE_KERNEL_EXEC |= _PAGE_GLOBAL;
|
|
}
|
|
|
|
kernel_physical_mapping_init(pgd_base);
|
|
remap_numa_kva();
|
|
|
|
/*
|
|
* 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;
|
|
page_table_range_init(vaddr, 0, pgd_base);
|
|
|
|
permanent_kmaps_init(pgd_base);
|
|
|
|
#ifdef CONFIG_X86_PAE
|
|
/*
|
|
* Add low memory identity-mappings - SMP needs it when
|
|
* starting up on an AP from real-mode. In the non-PAE
|
|
* case we already have these mappings through head.S.
|
|
* All user-space mappings are explicitly cleared after
|
|
* SMP startup.
|
|
*/
|
|
set_pgd(&pgd_base[0], pgd_base[USER_PTRS_PER_PGD]);
|
|
#endif
|
|
}
|
|
|
|
#if defined(CONFIG_SOFTWARE_SUSPEND) || defined(CONFIG_ACPI_SLEEP)
|
|
/*
|
|
* Swap suspend & friends need this for resume because things like the intel-agp
|
|
* driver might have split up a kernel 4MB mapping.
|
|
*/
|
|
char __nosavedata swsusp_pg_dir[PAGE_SIZE]
|
|
__attribute__ ((aligned (PAGE_SIZE)));
|
|
|
|
static inline void save_pg_dir(void)
|
|
{
|
|
memcpy(swsusp_pg_dir, swapper_pg_dir, PAGE_SIZE);
|
|
}
|
|
#else
|
|
static inline void save_pg_dir(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
void zap_low_mappings (void)
|
|
{
|
|
int i;
|
|
|
|
save_pg_dir();
|
|
|
|
/*
|
|
* Zap initial low-memory mappings.
|
|
*
|
|
* Note that "pgd_clear()" doesn't do it for
|
|
* us, because pgd_clear() is a no-op on i386.
|
|
*/
|
|
for (i = 0; i < USER_PTRS_PER_PGD; i++)
|
|
#ifdef CONFIG_X86_PAE
|
|
set_pgd(swapper_pg_dir+i, __pgd(1 + __pa(empty_zero_page)));
|
|
#else
|
|
set_pgd(swapper_pg_dir+i, __pgd(0));
|
|
#endif
|
|
flush_tlb_all();
|
|
}
|
|
|
|
static int disable_nx __initdata = 0;
|
|
u64 __supported_pte_mask __read_mostly = ~_PAGE_NX;
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
early_param("noexec", noexec_setup);
|
|
|
|
int nx_enabled = 0;
|
|
#ifdef CONFIG_X86_PAE
|
|
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Enables/disables executability of a given kernel page and
|
|
* returns the previous setting.
|
|
*/
|
|
int __init set_kernel_exec(unsigned long vaddr, int enable)
|
|
{
|
|
pte_t *pte;
|
|
int ret = 1;
|
|
|
|
if (!nx_enabled)
|
|
goto out;
|
|
|
|
pte = lookup_address(vaddr);
|
|
BUG_ON(!pte);
|
|
|
|
if (!pte_exec_kernel(*pte))
|
|
ret = 0;
|
|
|
|
if (enable)
|
|
pte->pte_high &= ~(1 << (_PAGE_BIT_NX - 32));
|
|
else
|
|
pte->pte_high |= 1 << (_PAGE_BIT_NX - 32);
|
|
pte_update_defer(&init_mm, vaddr, pte);
|
|
__flush_tlb_all();
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
#ifdef CONFIG_X86_PAE
|
|
set_nx();
|
|
if (nx_enabled)
|
|
printk("NX (Execute Disable) protection: active\n");
|
|
#endif
|
|
|
|
pagetable_init();
|
|
|
|
load_cr3(swapper_pg_dir);
|
|
|
|
#ifdef CONFIG_X86_PAE
|
|
/*
|
|
* We will bail out later - printk doesn't work right now so
|
|
* the user would just see a hanging kernel.
|
|
*/
|
|
if (cpu_has_pae)
|
|
set_in_cr4(X86_CR4_PAE);
|
|
#endif
|
|
__flush_tlb_all();
|
|
|
|
kmap_init();
|
|
}
|
|
|
|
/*
|
|
* Test if the WP bit works in supervisor mode. It isn't supported on 386's
|
|
* and also on some strange 486's (NexGen etc.). 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("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("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("Ok.\n");
|
|
}
|
|
}
|
|
|
|
static struct kcore_list kcore_mem, kcore_vmalloc;
|
|
|
|
void __init mem_init(void)
|
|
{
|
|
extern int ppro_with_ram_bug(void);
|
|
int codesize, reservedpages, datasize, initsize;
|
|
int tmp;
|
|
int bad_ppro;
|
|
|
|
#ifdef CONFIG_FLATMEM
|
|
BUG_ON(!mem_map);
|
|
#endif
|
|
|
|
bad_ppro = ppro_with_ram_bug();
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
/* check that fixmap and pkmap do not overlap */
|
|
if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
|
|
printk(KERN_ERR "fixmap and kmap areas overlap - this will crash\n");
|
|
printk(KERN_ERR "pkstart: %lxh pkend: %lxh fixstart %lxh\n",
|
|
PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, FIXADDR_START);
|
|
BUG();
|
|
}
|
|
#endif
|
|
|
|
/* 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++;
|
|
|
|
set_highmem_pages_init(bad_ppro);
|
|
|
|
codesize = (unsigned long) &_etext - (unsigned long) &_text;
|
|
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),
|
|
num_physpages << (PAGE_SHIFT-10),
|
|
codesize >> 10,
|
|
reservedpages << (PAGE_SHIFT-10),
|
|
datasize >> 10,
|
|
initsize >> 10,
|
|
(unsigned long) (totalhigh_pages << (PAGE_SHIFT-10))
|
|
);
|
|
|
|
#if 1 /* double-sanity-check paranoia */
|
|
printk("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);
|
|
|
|
#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);
|
|
#endif /* double-sanity-check paranoia */
|
|
|
|
#ifdef CONFIG_X86_PAE
|
|
if (!cpu_has_pae)
|
|
panic("cannot execute a PAE-enabled kernel on a PAE-less CPU!");
|
|
#endif
|
|
if (boot_cpu_data.wp_works_ok < 0)
|
|
test_wp_bit();
|
|
|
|
/*
|
|
* Subtle. SMP is doing it's boot stuff late (because it has to
|
|
* fork idle threads) - but it also needs low mappings for the
|
|
* protected-mode entry to work. We zap these entries only after
|
|
* the WP-bit has been tested.
|
|
*/
|
|
#ifndef CONFIG_SMP
|
|
zap_low_mappings();
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* this is for the non-NUMA, single node SMP system case.
|
|
* Specifically, in the case of x86, we will always add
|
|
* memory to the highmem for now.
|
|
*/
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
#ifndef CONFIG_NEED_MULTIPLE_NODES
|
|
int arch_add_memory(int nid, u64 start, u64 size)
|
|
{
|
|
struct pglist_data *pgdata = &contig_page_data;
|
|
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(zone, start_pfn, nr_pages);
|
|
}
|
|
|
|
int remove_memory(u64 start, u64 size)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
kmem_cache_t *pgd_cache;
|
|
kmem_cache_t *pmd_cache;
|
|
|
|
void __init pgtable_cache_init(void)
|
|
{
|
|
if (PTRS_PER_PMD > 1) {
|
|
pmd_cache = kmem_cache_create("pmd",
|
|
PTRS_PER_PMD*sizeof(pmd_t),
|
|
PTRS_PER_PMD*sizeof(pmd_t),
|
|
0,
|
|
pmd_ctor,
|
|
NULL);
|
|
if (!pmd_cache)
|
|
panic("pgtable_cache_init(): cannot create pmd cache");
|
|
}
|
|
pgd_cache = kmem_cache_create("pgd",
|
|
PTRS_PER_PGD*sizeof(pgd_t),
|
|
PTRS_PER_PGD*sizeof(pgd_t),
|
|
0,
|
|
pgd_ctor,
|
|
PTRS_PER_PMD == 1 ? pgd_dtor : NULL);
|
|
if (!pgd_cache)
|
|
panic("pgtable_cache_init(): Cannot create pgd cache");
|
|
}
|
|
|
|
/*
|
|
* 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 int noinline 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"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4 \n"
|
|
" .long 1b,2b \n"
|
|
".previous \n"
|
|
:"=m" (*(char *)fix_to_virt(FIX_WP_TEST)),
|
|
"=q" (tmp_reg),
|
|
"=r" (flag)
|
|
:"2" (1)
|
|
:"memory");
|
|
|
|
return flag;
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_RODATA
|
|
|
|
void mark_rodata_ro(void)
|
|
{
|
|
unsigned long addr = (unsigned long)__start_rodata;
|
|
|
|
for (; addr < (unsigned long)__end_rodata; addr += PAGE_SIZE)
|
|
change_page_attr(virt_to_page(addr), 1, PAGE_KERNEL_RO);
|
|
|
|
printk("Write protecting the kernel read-only data: %uk\n",
|
|
(__end_rodata - __start_rodata) >> 10);
|
|
|
|
/*
|
|
* change_page_attr() requires a global_flush_tlb() call after it.
|
|
* We do this after the printk so that if something went wrong in the
|
|
* change, the printk gets out at least to give a better debug hint
|
|
* of who is the culprit.
|
|
*/
|
|
global_flush_tlb();
|
|
}
|
|
#endif
|
|
|
|
void free_init_pages(char *what, unsigned long begin, unsigned long end)
|
|
{
|
|
unsigned long addr;
|
|
|
|
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: %ldk freed\n", what, (end - begin) >> 10);
|
|
}
|
|
|
|
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
|
|
|