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-rw-r--r--arch/x86/mm/init_64.c9
-rw-r--r--arch/x86/mm/ioremap.c105
-rw-r--r--arch/x86/realmode/init.c17
3 files changed, 3 insertions, 128 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 07519a120449..2ead3c8a4c84 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -108,13 +108,13 @@ void sync_global_pgds(unsigned long start, unsigned long end)
for (address = start; address <= end; address += PGDIR_SIZE) {
const pgd_t *pgd_ref = pgd_offset_k(address);
struct page *page;
- pgd_t *pgd;
if (pgd_none(*pgd_ref))
continue;
spin_lock(&pgd_lock);
list_for_each_entry(page, &pgd_list, lru) {
+ pgd_t *pgd;
spinlock_t *pgt_lock;
pgd = (pgd_t *)page_address(page) + pgd_index(address);
@@ -130,13 +130,6 @@ void sync_global_pgds(unsigned long start, unsigned long end)
spin_unlock(pgt_lock);
}
-
- pgd = __va(real_mode_header->trampoline_pgd);
- pgd += pgd_index(address);
-
- if (pgd_none(*pgd))
- set_pgd(pgd, *pgd_ref);
-
spin_unlock(&pgd_lock);
}
}
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index e190f7b56653..78fe3f1ac49f 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -50,107 +50,6 @@ int ioremap_change_attr(unsigned long vaddr, unsigned long size,
return err;
}
-#ifdef CONFIG_X86_64
-static void ident_pte_range(unsigned long paddr, unsigned long vaddr,
- pmd_t *ppmd, pmd_t *vpmd, unsigned long end)
-{
- pte_t *ppte = pte_offset_kernel(ppmd, paddr);
- pte_t *vpte = pte_offset_kernel(vpmd, vaddr);
-
- do {
- set_pte(ppte, *vpte);
- } while (ppte++, vpte++, vaddr += PAGE_SIZE, vaddr != end);
-}
-
-static int ident_pmd_range(unsigned long paddr, unsigned long vaddr,
- pud_t *ppud, pud_t *vpud, unsigned long end)
-{
- pmd_t *ppmd = pmd_offset(ppud, paddr);
- pmd_t *vpmd = pmd_offset(vpud, vaddr);
- unsigned long next;
-
- do {
- next = pmd_addr_end(vaddr, end);
-
- if (!pmd_present(*ppmd)) {
- pte_t *ppte = (pte_t *)get_zeroed_page(GFP_KERNEL);
- if (!ppte)
- return 1;
-
- set_pmd(ppmd, __pmd(_KERNPG_TABLE | __pa(ppte)));
- }
-
- ident_pte_range(paddr, vaddr, ppmd, vpmd, next);
- } while (ppmd++, vpmd++, vaddr = next, vaddr != end);
-
- return 0;
-}
-
-static int ident_pud_range(unsigned long paddr, unsigned long vaddr,
- pgd_t *ppgd, pgd_t *vpgd, unsigned long end)
-{
- pud_t *ppud = pud_offset(ppgd, paddr);
- pud_t *vpud = pud_offset(vpgd, vaddr);
- unsigned long next;
-
- do {
- next = pud_addr_end(vaddr, end);
-
- if (!pud_present(*ppud)) {
- pmd_t *ppmd = (pmd_t *)get_zeroed_page(GFP_KERNEL);
- if (!ppmd)
- return 1;
-
- set_pud(ppud, __pud(_KERNPG_TABLE | __pa(ppmd)));
- }
-
- if (ident_pmd_range(paddr, vaddr, ppud, vpud, next))
- return 1;
- } while (ppud++, vpud++, vaddr = next, vaddr != end);
-
- return 0;
-}
-
-static int insert_identity_mapping(resource_size_t paddr, unsigned long vaddr,
- unsigned long size)
-{
- unsigned long end = vaddr + size;
- unsigned long next;
- pgd_t *vpgd, *ppgd;
-
- /* Don't map over the guard hole. */
- if (paddr >= 0x800000000000 || paddr + size > 0x800000000000)
- return 1;
-
- ppgd = __va(real_mode_header->trampoline_pgd) + pgd_index(paddr);
-
- vpgd = pgd_offset_k(vaddr);
- do {
- next = pgd_addr_end(vaddr, end);
-
- if (!pgd_present(*ppgd)) {
- pud_t *ppud = (pud_t *)get_zeroed_page(GFP_KERNEL);
- if (!ppud)
- return 1;
-
- set_pgd(ppgd, __pgd(_KERNPG_TABLE | __pa(ppud)));
- }
-
- if (ident_pud_range(paddr, vaddr, ppgd, vpgd, next))
- return 1;
- } while (ppgd++, vpgd++, vaddr = next, vaddr != end);
-
- return 0;
-}
-#else
-static inline int insert_identity_mapping(resource_size_t paddr,
- unsigned long vaddr,
- unsigned long size)
-{
- return 0;
-}
-#endif /* CONFIG_X86_64 */
-
/*
* Remap an arbitrary physical address space into the kernel virtual
* address space. Needed when the kernel wants to access high addresses
@@ -264,10 +163,6 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
ret_addr = (void __iomem *) (vaddr + offset);
mmiotrace_ioremap(unaligned_phys_addr, unaligned_size, ret_addr);
- if (insert_identity_mapping(phys_addr, vaddr, size))
- printk(KERN_WARNING "ioremap: unable to map 0x%llx in identity pagetable\n",
- (unsigned long long)phys_addr);
-
/*
* Check if the request spans more than any BAR in the iomem resource
* tree.
diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
index 8e6ab6137852..cbca565af5bd 100644
--- a/arch/x86/realmode/init.c
+++ b/arch/x86/realmode/init.c
@@ -78,21 +78,8 @@ void __init setup_real_mode(void)
*trampoline_cr4_features = read_cr4();
trampoline_pgd = (u64 *) __va(real_mode_header->trampoline_pgd);
-
- /*
- * Create an identity mapping for all of physical memory.
- */
- for (i = 0; i <= pgd_index(max_pfn << PAGE_SHIFT); i++) {
- int index = pgd_index(PAGE_OFFSET) + i;
-
- trampoline_pgd[i] = (u64)pgd_val(swapper_pg_dir[index]);
- }
-
- /*
- * Copy the upper-half of the kernel pages tables.
- */
- for (i = pgd_index(PAGE_OFFSET); i < PTRS_PER_PGD; i++)
- trampoline_pgd[i] = (u64)pgd_val(swapper_pg_dir[i]);
+ trampoline_pgd[0] = __pa(level3_ident_pgt) + _KERNPG_TABLE;
+ trampoline_pgd[511] = __pa(level3_kernel_pgt) + _KERNPG_TABLE;
#endif
}