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init_64.c
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/*
* linux/arch/x86_64/mm/init.c
*
* Copyright (C) 1995 Linus Torvalds
* Copyright (C) 2000 Pavel Machek <[email protected]>
* Copyright (C) 2002,2003 Andi Kleen <[email protected]>
*/
#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/swap.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/initrd.h>
#include <linux/pagemap.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/proc_fs.h>
#include <linux/pci.h>
#include <linux/pfn.h>
#include <linux/poison.h>
#include <linux/dma-mapping.h>
#include <linux/memory.h>
#include <linux/memory_hotplug.h>
#include <linux/memremap.h>
#include <linux/nmi.h>
#include <linux/gfp.h>
#include <linux/kcore.h>
#include <asm/processor.h>
#include <asm/bios_ebda.h>
#include <linux/uaccess.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/dma.h>
#include <asm/fixmap.h>
#include <asm/e820/api.h>
#include <asm/apic.h>
#include <asm/tlb.h>
#include <asm/mmu_context.h>
#include <asm/proto.h>
#include <asm/smp.h>
#include <asm/sections.h>
#include <asm/kdebug.h>
#include <asm/numa.h>
#include <asm/set_memory.h>
#include <asm/init.h>
#include <asm/uv/uv.h>
#include <asm/setup.h>
#include "mm_internal.h"
#include "ident_map.c"
/*
* NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
* physical space so we can cache the place of the first one and move
* around without checking the pgd every time.
*/
pteval_t __supported_pte_mask __read_mostly = ~0;
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);
/*
* When memory was added make sure all the processes MM have
* suitable PGD entries in the local PGD level page.
*/
void sync_global_pgds(unsigned long start, unsigned long end)
{
unsigned long addr;
for (addr = start; addr <= end; addr = ALIGN(addr + 1, PGDIR_SIZE)) {
pgd_t *pgd_ref = pgd_offset_k(addr);
const p4d_t *p4d_ref;
struct page *page;
/*
* With folded p4d, pgd_none() is always false, we need to
* handle synchonization on p4d level.
*/
BUILD_BUG_ON(pgd_none(*pgd_ref));
p4d_ref = p4d_offset(pgd_ref, addr);
if (p4d_none(*p4d_ref))
continue;
spin_lock(&pgd_lock);
list_for_each_entry(page, &pgd_list, lru) {
pgd_t *pgd;
p4d_t *p4d;
spinlock_t *pgt_lock;
pgd = (pgd_t *)page_address(page) + pgd_index(addr);
p4d = p4d_offset(pgd, addr);
/* the pgt_lock only for Xen */
pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
spin_lock(pgt_lock);
if (!p4d_none(*p4d_ref) && !p4d_none(*p4d))
BUG_ON(p4d_page_vaddr(*p4d)
!= p4d_page_vaddr(*p4d_ref));
if (p4d_none(*p4d))
set_p4d(p4d, *p4d_ref);
spin_unlock(pgt_lock);
}
spin_unlock(&pgd_lock);
}
}
/*
* NOTE: This function is marked __ref because it calls __init function
* (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0.
*/
static __ref void *spp_getpage(void)
{
void *ptr;
if (after_bootmem)
ptr = (void *) get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK);
else
ptr = alloc_bootmem_pages(PAGE_SIZE);
if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) {
panic("set_pte_phys: cannot allocate page data %s\n",
after_bootmem ? "after bootmem" : "");
}
pr_debug("spp_getpage %p\n", ptr);
return ptr;
}
static p4d_t *fill_p4d(pgd_t *pgd, unsigned long vaddr)
{
if (pgd_none(*pgd)) {
p4d_t *p4d = (p4d_t *)spp_getpage();
pgd_populate(&init_mm, pgd, p4d);
if (p4d != p4d_offset(pgd, 0))
printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n",
p4d, p4d_offset(pgd, 0));
}
return p4d_offset(pgd, vaddr);
}
static pud_t *fill_pud(p4d_t *p4d, unsigned long vaddr)
{
if (p4d_none(*p4d)) {
pud_t *pud = (pud_t *)spp_getpage();
p4d_populate(&init_mm, p4d, pud);
if (pud != pud_offset(p4d, 0))
printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
pud, pud_offset(p4d, 0));
}
return pud_offset(p4d, vaddr);
}
static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr)
{
if (pud_none(*pud)) {
pmd_t *pmd = (pmd_t *) spp_getpage();
pud_populate(&init_mm, pud, pmd);
if (pmd != pmd_offset(pud, 0))
printk(KERN_ERR "PAGETABLE BUG #02! %p <-> %p\n",
pmd, pmd_offset(pud, 0));
}
return pmd_offset(pud, vaddr);
}
static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr)
{
if (pmd_none(*pmd)) {
pte_t *pte = (pte_t *) spp_getpage();
pmd_populate_kernel(&init_mm, pmd, pte);
if (pte != pte_offset_kernel(pmd, 0))
printk(KERN_ERR "PAGETABLE BUG #03!\n");
}
return pte_offset_kernel(pmd, vaddr);
}
static void __set_pte_vaddr(pud_t *pud, unsigned long vaddr, pte_t new_pte)
{
pmd_t *pmd = fill_pmd(pud, vaddr);
pte_t *pte = fill_pte(pmd, vaddr);
set_pte(pte, new_pte);
/*
* It's enough to flush this one mapping.
* (PGE mappings get flushed as well)
*/
__flush_tlb_one(vaddr);
}
void set_pte_vaddr_p4d(p4d_t *p4d_page, unsigned long vaddr, pte_t new_pte)
{
p4d_t *p4d = p4d_page + p4d_index(vaddr);
pud_t *pud = fill_pud(p4d, vaddr);
__set_pte_vaddr(pud, vaddr, new_pte);
}
void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
{
pud_t *pud = pud_page + pud_index(vaddr);
__set_pte_vaddr(pud, vaddr, new_pte);
}
void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
{
pgd_t *pgd;
p4d_t *p4d_page;
pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval));
pgd = pgd_offset_k(vaddr);
if (pgd_none(*pgd)) {
printk(KERN_ERR
"PGD FIXMAP MISSING, it should be setup in head.S!\n");
return;
}
p4d_page = p4d_offset(pgd, 0);
set_pte_vaddr_p4d(p4d_page, vaddr, pteval);
}
pmd_t * __init populate_extra_pmd(unsigned long vaddr)
{
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pgd = pgd_offset_k(vaddr);
p4d = fill_p4d(pgd, vaddr);
pud = fill_pud(p4d, 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.
*/
static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
enum page_cache_mode cache)
{
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pgprot_t prot;
pgprot_val(prot) = pgprot_val(PAGE_KERNEL_LARGE) |
pgprot_val(pgprot_4k_2_large(cachemode2pgprot(cache)));
BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK));
for (; size; phys += PMD_SIZE, size -= PMD_SIZE) {
pgd = pgd_offset_k((unsigned long)__va(phys));
if (pgd_none(*pgd)) {
p4d = (p4d_t *) spp_getpage();
set_pgd(pgd, __pgd(__pa(p4d) | _KERNPG_TABLE |
_PAGE_USER));
}
p4d = p4d_offset(pgd, (unsigned long)__va(phys));
if (p4d_none(*p4d)) {
pud = (pud_t *) spp_getpage();
set_p4d(p4d, __p4d(__pa(pud) | _KERNPG_TABLE |
_PAGE_USER));
}
pud = pud_offset(p4d, (unsigned long)__va(phys));
if (pud_none(*pud)) {
pmd = (pmd_t *) spp_getpage();
set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE |
_PAGE_USER));
}
pmd = pmd_offset(pud, phys);
BUG_ON(!pmd_none(*pmd));
set_pmd(pmd, __pmd(phys | pgprot_val(prot)));
}
}
void __init init_extra_mapping_wb(unsigned long phys, unsigned long size)
{
__init_extra_mapping(phys, size, _PAGE_CACHE_MODE_WB);
}
void __init init_extra_mapping_uc(unsigned long phys, unsigned long size)
{
__init_extra_mapping(phys, size, _PAGE_CACHE_MODE_UC);
}
/*
* The head.S code sets up the kernel high mapping:
*
* from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
*
* phys_base holds the negative offset to the kernel, which is added
* to the compile time generated pmds. This results in invalid pmds up
* to the point where we hit the physaddr 0 mapping.
*
* We limit the mappings to the region from _text to _brk_end. _brk_end
* is rounded up to the 2MB boundary. This catches the invalid pmds as
* well, as they are located before _text:
*/
void __init cleanup_highmap(void)
{
unsigned long vaddr = __START_KERNEL_map;
unsigned long vaddr_end = __START_KERNEL_map + KERNEL_IMAGE_SIZE;
unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1;
pmd_t *pmd = level2_kernel_pgt;
/*
* Native path, max_pfn_mapped is not set yet.
* Xen has valid max_pfn_mapped set in
* arch/x86/xen/mmu.c:xen_setup_kernel_pagetable().
*/
if (max_pfn_mapped)
vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT);
for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) {
if (pmd_none(*pmd))
continue;
if (vaddr < (unsigned long) _text || vaddr > end)
set_pmd(pmd, __pmd(0));
}
}
/*
* Create PTE level page table mapping for physical addresses.
* It returns the last physical address mapped.
*/
static unsigned long __meminit
phys_pte_init(pte_t *pte_page, unsigned long paddr, unsigned long paddr_end,
pgprot_t prot)
{
unsigned long pages = 0, paddr_next;
unsigned long paddr_last = paddr_end;
pte_t *pte;
int i;
pte = pte_page + pte_index(paddr);
i = pte_index(paddr);
for (; i < PTRS_PER_PTE; i++, paddr = paddr_next, pte++) {
paddr_next = (paddr & PAGE_MASK) + PAGE_SIZE;
if (paddr >= paddr_end) {
if (!after_bootmem &&
!e820__mapped_any(paddr & PAGE_MASK, paddr_next,
E820_TYPE_RAM) &&
!e820__mapped_any(paddr & PAGE_MASK, paddr_next,
E820_TYPE_RESERVED_KERN))
set_pte(pte, __pte(0));
continue;
}
/*
* 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_none(*pte)) {
if (!after_bootmem)
pages++;
continue;
}
if (0)
pr_info(" pte=%p addr=%lx pte=%016lx\n", pte, paddr,
pfn_pte(paddr >> PAGE_SHIFT, PAGE_KERNEL).pte);
pages++;
set_pte(pte, pfn_pte(paddr >> PAGE_SHIFT, prot));
paddr_last = (paddr & PAGE_MASK) + PAGE_SIZE;
}
update_page_count(PG_LEVEL_4K, pages);
return paddr_last;
}
/*
* Create PMD level page table mapping for physical addresses. The virtual
* and physical address have to be aligned at this level.
* It returns the last physical address mapped.
*/
static unsigned long __meminit
phys_pmd_init(pmd_t *pmd_page, unsigned long paddr, unsigned long paddr_end,
unsigned long page_size_mask, pgprot_t prot)
{
unsigned long pages = 0, paddr_next;
unsigned long paddr_last = paddr_end;
int i = pmd_index(paddr);
for (; i < PTRS_PER_PMD; i++, paddr = paddr_next) {
pmd_t *pmd = pmd_page + pmd_index(paddr);
pte_t *pte;
pgprot_t new_prot = prot;
paddr_next = (paddr & PMD_MASK) + PMD_SIZE;
if (paddr >= paddr_end) {
if (!after_bootmem &&
!e820__mapped_any(paddr & PMD_MASK, paddr_next,
E820_TYPE_RAM) &&
!e820__mapped_any(paddr & PMD_MASK, paddr_next,
E820_TYPE_RESERVED_KERN))
set_pmd(pmd, __pmd(0));
continue;
}
if (!pmd_none(*pmd)) {
if (!pmd_large(*pmd)) {
spin_lock(&init_mm.page_table_lock);
pte = (pte_t *)pmd_page_vaddr(*pmd);
paddr_last = phys_pte_init(pte, paddr,
paddr_end, prot);
spin_unlock(&init_mm.page_table_lock);
continue;
}
/*
* 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)) {
if (!after_bootmem)
pages++;
paddr_last = paddr_next;
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((paddr & PMD_MASK) >> PAGE_SHIFT,
__pgprot(pgprot_val(prot) | _PAGE_PSE)));
spin_unlock(&init_mm.page_table_lock);
paddr_last = paddr_next;
continue;
}
pte = alloc_low_page();
paddr_last = phys_pte_init(pte, paddr, paddr_end, new_prot);
spin_lock(&init_mm.page_table_lock);
pmd_populate_kernel(&init_mm, pmd, pte);
spin_unlock(&init_mm.page_table_lock);
}
update_page_count(PG_LEVEL_2M, pages);
return paddr_last;
}
/*
* Create PUD level page table mapping for physical addresses. The virtual
* and physical address do not have to be aligned at this level. KASLR can
* randomize virtual addresses up to this level.
* It returns the last physical address mapped.
*/
static unsigned long __meminit
phys_pud_init(pud_t *pud_page, unsigned long paddr, unsigned long paddr_end,
unsigned long page_size_mask)
{
unsigned long pages = 0, paddr_next;
unsigned long paddr_last = paddr_end;
unsigned long vaddr = (unsigned long)__va(paddr);
int i = pud_index(vaddr);
for (; i < PTRS_PER_PUD; i++, paddr = paddr_next) {
pud_t *pud;
pmd_t *pmd;
pgprot_t prot = PAGE_KERNEL;
vaddr = (unsigned long)__va(paddr);
pud = pud_page + pud_index(vaddr);
paddr_next = (paddr & PUD_MASK) + PUD_SIZE;
if (paddr >= paddr_end) {
if (!after_bootmem &&
!e820__mapped_any(paddr & PUD_MASK, paddr_next,
E820_TYPE_RAM) &&
!e820__mapped_any(paddr & PUD_MASK, paddr_next,
E820_TYPE_RESERVED_KERN))
set_pud(pud, __pud(0));
continue;
}
if (!pud_none(*pud)) {
if (!pud_large(*pud)) {
pmd = pmd_offset(pud, 0);
paddr_last = phys_pmd_init(pmd, paddr,
paddr_end,
page_size_mask,
prot);
__flush_tlb_all();
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)) {
if (!after_bootmem)
pages++;
paddr_last = paddr_next;
continue;
}
prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud));
}
if (page_size_mask & (1<<PG_LEVEL_1G)) {
pages++;
spin_lock(&init_mm.page_table_lock);
set_pte((pte_t *)pud,
pfn_pte((paddr & PUD_MASK) >> PAGE_SHIFT,
PAGE_KERNEL_LARGE));
spin_unlock(&init_mm.page_table_lock);
paddr_last = paddr_next;
continue;
}
pmd = alloc_low_page();
paddr_last = phys_pmd_init(pmd, paddr, paddr_end,
page_size_mask, prot);
spin_lock(&init_mm.page_table_lock);
pud_populate(&init_mm, pud, pmd);
spin_unlock(&init_mm.page_table_lock);
}
__flush_tlb_all();
update_page_count(PG_LEVEL_1G, pages);
return paddr_last;
}
/*
* Create page table mapping for the physical memory for specific physical
* addresses. The virtual and physical addresses have to be aligned on PMD level
* down. It returns the last physical address mapped.
*/
unsigned long __meminit
kernel_physical_mapping_init(unsigned long paddr_start,
unsigned long paddr_end,
unsigned long page_size_mask)
{
bool pgd_changed = false;
unsigned long vaddr, vaddr_start, vaddr_end, vaddr_next, paddr_last;
paddr_last = paddr_end;
vaddr = (unsigned long)__va(paddr_start);
vaddr_end = (unsigned long)__va(paddr_end);
vaddr_start = vaddr;
for (; vaddr < vaddr_end; vaddr = vaddr_next) {
pgd_t *pgd = pgd_offset_k(vaddr);
p4d_t *p4d;
pud_t *pud;
vaddr_next = (vaddr & PGDIR_MASK) + PGDIR_SIZE;
BUILD_BUG_ON(pgd_none(*pgd));
p4d = p4d_offset(pgd, vaddr);
if (p4d_val(*p4d)) {
pud = (pud_t *)p4d_page_vaddr(*p4d);
paddr_last = phys_pud_init(pud, __pa(vaddr),
__pa(vaddr_end),
page_size_mask);
continue;
}
pud = alloc_low_page();
paddr_last = phys_pud_init(pud, __pa(vaddr), __pa(vaddr_end),
page_size_mask);
spin_lock(&init_mm.page_table_lock);
p4d_populate(&init_mm, p4d, pud);
spin_unlock(&init_mm.page_table_lock);
pgd_changed = true;
}
if (pgd_changed)
sync_global_pgds(vaddr_start, vaddr_end - 1);
__flush_tlb_all();
return paddr_last;
}
#ifndef CONFIG_NUMA
void __init initmem_init(void)
{
memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0);
}
#endif
void __init paging_init(void)
{
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_MEMORY);
if (N_MEMORY != N_NORMAL_MEMORY)
node_clear_state(0, N_NORMAL_MEMORY);
zone_sizes_init();
}
/*
* 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.
*/
int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
{
struct pglist_data *pgdat = NODE_DATA(nid);
struct zone *zone = pgdat->node_zones +
zone_for_memory(nid, start, size, ZONE_NORMAL, for_device);
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;
init_memory_mapping(start, start + size);
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;
}
EXPORT_SYMBOL_GPL(arch_add_memory);
#define PAGE_INUSE 0xFD
static void __meminit free_pagetable(struct page *page, int order)
{
unsigned long magic;
unsigned int nr_pages = 1 << order;
struct vmem_altmap *altmap = to_vmem_altmap((unsigned long) page);
if (altmap) {
vmem_altmap_free(altmap, nr_pages);
return;
}
/* bootmem page has reserved flag */
if (PageReserved(page)) {
__ClearPageReserved(page);
magic = (unsigned long)page->freelist;
if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) {
while (nr_pages--)
put_page_bootmem(page++);
} else
while (nr_pages--)
free_reserved_page(page++);
} else
free_pages((unsigned long)page_address(page), order);
}
static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd)
{
pte_t *pte;
int i;
for (i = 0; i < PTRS_PER_PTE; i++) {
pte = pte_start + i;
if (!pte_none(*pte))
return;
}
/* free a pte talbe */
free_pagetable(pmd_page(*pmd), 0);
spin_lock(&init_mm.page_table_lock);
pmd_clear(pmd);
spin_unlock(&init_mm.page_table_lock);
}
static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud)
{
pmd_t *pmd;
int i;
for (i = 0; i < PTRS_PER_PMD; i++) {
pmd = pmd_start + i;
if (!pmd_none(*pmd))
return;
}
/* free a pmd talbe */
free_pagetable(pud_page(*pud), 0);
spin_lock(&init_mm.page_table_lock);
pud_clear(pud);
spin_unlock(&init_mm.page_table_lock);
}
static void __meminit free_pud_table(pud_t *pud_start, p4d_t *p4d)
{
pud_t *pud;
int i;
for (i = 0; i < PTRS_PER_PUD; i++) {
pud = pud_start + i;
if (!pud_none(*pud))
return;
}
/* free a pud talbe */
free_pagetable(p4d_page(*p4d), 0);
spin_lock(&init_mm.page_table_lock);
p4d_clear(p4d);
spin_unlock(&init_mm.page_table_lock);
}
static void __meminit
remove_pte_table(pte_t *pte_start, unsigned long addr, unsigned long end,
bool direct)
{
unsigned long next, pages = 0;
pte_t *pte;
void *page_addr;
phys_addr_t phys_addr;
pte = pte_start + pte_index(addr);
for (; addr < end; addr = next, pte++) {
next = (addr + PAGE_SIZE) & PAGE_MASK;
if (next > end)
next = end;
if (!pte_present(*pte))
continue;
/*
* We mapped [0,1G) memory as identity mapping when
* initializing, in arch/x86/kernel/head_64.S. These
* pagetables cannot be removed.
*/
phys_addr = pte_val(*pte) + (addr & PAGE_MASK);
if (phys_addr < (phys_addr_t)0x40000000)
return;
if (PAGE_ALIGNED(addr) && PAGE_ALIGNED(next)) {
/*
* Do not free direct mapping pages since they were
* freed when offlining, or simplely not in use.
*/
if (!direct)
free_pagetable(pte_page(*pte), 0);
spin_lock(&init_mm.page_table_lock);
pte_clear(&init_mm, addr, pte);
spin_unlock(&init_mm.page_table_lock);
/* For non-direct mapping, pages means nothing. */
pages++;
} else {
/*
* If we are here, we are freeing vmemmap pages since
* direct mapped memory ranges to be freed are aligned.
*
* If we are not removing the whole page, it means
* other page structs in this page are being used and
* we canot remove them. So fill the unused page_structs
* with 0xFD, and remove the page when it is wholly
* filled with 0xFD.
*/
memset((void *)addr, PAGE_INUSE, next - addr);
page_addr = page_address(pte_page(*pte));
if (!memchr_inv(page_addr, PAGE_INUSE, PAGE_SIZE)) {
free_pagetable(pte_page(*pte), 0);
spin_lock(&init_mm.page_table_lock);
pte_clear(&init_mm, addr, pte);
spin_unlock(&init_mm.page_table_lock);
}
}
}
/* Call free_pte_table() in remove_pmd_table(). */
flush_tlb_all();
if (direct)
update_page_count(PG_LEVEL_4K, -pages);
}
static void __meminit
remove_pmd_table(pmd_t *pmd_start, unsigned long addr, unsigned long end,
bool direct)
{
unsigned long next, pages = 0;
pte_t *pte_base;
pmd_t *pmd;
void *page_addr;
pmd = pmd_start + pmd_index(addr);
for (; addr < end; addr = next, pmd++) {
next = pmd_addr_end(addr, end);
if (!pmd_present(*pmd))
continue;
if (pmd_large(*pmd)) {
if (IS_ALIGNED(addr, PMD_SIZE) &&
IS_ALIGNED(next, PMD_SIZE)) {
if (!direct)
free_pagetable(pmd_page(*pmd),
get_order(PMD_SIZE));
spin_lock(&init_mm.page_table_lock);
pmd_clear(pmd);
spin_unlock(&init_mm.page_table_lock);
pages++;
} else {
/* If here, we are freeing vmemmap pages. */
memset((void *)addr, PAGE_INUSE, next - addr);
page_addr = page_address(pmd_page(*pmd));
if (!memchr_inv(page_addr, PAGE_INUSE,
PMD_SIZE)) {
free_pagetable(pmd_page(*pmd),
get_order(PMD_SIZE));
spin_lock(&init_mm.page_table_lock);
pmd_clear(pmd);
spin_unlock(&init_mm.page_table_lock);
}
}
continue;
}
pte_base = (pte_t *)pmd_page_vaddr(*pmd);
remove_pte_table(pte_base, addr, next, direct);
free_pte_table(pte_base, pmd);
}
/* Call free_pmd_table() in remove_pud_table(). */
if (direct)
update_page_count(PG_LEVEL_2M, -pages);
}
static void __meminit
remove_pud_table(pud_t *pud_start, unsigned long addr, unsigned long end,
bool direct)
{
unsigned long next, pages = 0;
pmd_t *pmd_base;
pud_t *pud;
void *page_addr;
pud = pud_start + pud_index(addr);
for (; addr < end; addr = next, pud++) {
next = pud_addr_end(addr, end);
if (!pud_present(*pud))
continue;
if (pud_large(*pud)) {
if (IS_ALIGNED(addr, PUD_SIZE) &&
IS_ALIGNED(next, PUD_SIZE)) {
if (!direct)
free_pagetable(pud_page(*pud),
get_order(PUD_SIZE));
spin_lock(&init_mm.page_table_lock);
pud_clear(pud);
spin_unlock(&init_mm.page_table_lock);
pages++;
} else {
/* If here, we are freeing vmemmap pages. */
memset((void *)addr, PAGE_INUSE, next - addr);
page_addr = page_address(pud_page(*pud));
if (!memchr_inv(page_addr, PAGE_INUSE,
PUD_SIZE)) {
free_pagetable(pud_page(*pud),
get_order(PUD_SIZE));
spin_lock(&init_mm.page_table_lock);
pud_clear(pud);
spin_unlock(&init_mm.page_table_lock);
}
}
continue;
}
pmd_base = pmd_offset(pud, 0);
remove_pmd_table(pmd_base, addr, next, direct);
free_pmd_table(pmd_base, pud);
}
if (direct)
update_page_count(PG_LEVEL_1G, -pages);
}
static void __meminit
remove_p4d_table(p4d_t *p4d_start, unsigned long addr, unsigned long end,
bool direct)
{
unsigned long next, pages = 0;
pud_t *pud_base;
p4d_t *p4d;
p4d = p4d_start + p4d_index(addr);
for (; addr < end; addr = next, p4d++) {
next = p4d_addr_end(addr, end);
if (!p4d_present(*p4d))
continue;
BUILD_BUG_ON(p4d_large(*p4d));
pud_base = pud_offset(p4d, 0);
remove_pud_table(pud_base, addr, next, direct);
free_pud_table(pud_base, p4d);
}
if (direct)
update_page_count(PG_LEVEL_512G, -pages);
}
/* start and end are both virtual address. */