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authorYinghai Lu <yhlu.kernel@gmail.com>2008-07-10 20:38:26 -0700
committerIngo Molnar <mingo@elte.hu>2008-07-11 10:24:04 +0200
commitf361a450bf1ad14e2b003217dbf3958638631265 (patch)
tree10c1e4dcc0047f6c37387cada6a0bceba088d2d2 /arch/x86/mm
parentf302a5bbe5eb95f3d4227d5bd0e9b92b1b125f4f (diff)
x86: introduce max_low_pfn_mapped for 64-bit
when more than 4g memory is installed, don't map the big hole below 4g. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm')
-rw-r--r--arch/x86/mm/init_32.c1
-rw-r--r--arch/x86/mm/init_64.c1
-rw-r--r--arch/x86/mm/pageattr.c19
-rw-r--r--arch/x86/mm/pat.c3
4 files changed, 21 insertions, 3 deletions
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index b5a0fd5f4c5..029e8cffca9 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -50,6 +50,7 @@
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);
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 48548ef7ddf..122bcef222f 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -53,6 +53,7 @@
* 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;
static unsigned long dma_reserve __initdata;
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index afd40054d15..0389cb8f6b1 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -536,8 +536,14 @@ static int split_large_page(pte_t *kpte, unsigned long address)
set_pte(&pbase[i], pfn_pte(pfn, ref_prot));
if (address >= (unsigned long)__va(0) &&
+ address < (unsigned long)__va(max_low_pfn_mapped << PAGE_SHIFT))
+ split_page_count(level);
+
+#ifdef CONFIG_X86_64
+ if (address >= (unsigned long)__va(1UL<<32) &&
address < (unsigned long)__va(max_pfn_mapped << PAGE_SHIFT))
split_page_count(level);
+#endif
/*
* Install the new, split up pagetable. Important details here:
@@ -655,12 +661,21 @@ static int cpa_process_alias(struct cpa_data *cpa)
if (cpa->pfn > max_pfn_mapped)
return 0;
+#ifdef CONFIG_X86_64
+ if (cpa->pfn > max_low_pfn_mapped && cpa->pfn < (1UL<<(32-PAGE_SHIFT)))
+ return 0;
+#endif
/*
* No need to redo, when the primary call touched the direct
* mapping already:
*/
- if (!within(cpa->vaddr, PAGE_OFFSET,
- PAGE_OFFSET + (max_pfn_mapped << PAGE_SHIFT))) {
+ if (!(within(cpa->vaddr, PAGE_OFFSET,
+ PAGE_OFFSET + (max_low_pfn_mapped << PAGE_SHIFT))
+#ifdef CONFIG_X86_64
+ || within(cpa->vaddr, PAGE_OFFSET + (1UL<<32),
+ PAGE_OFFSET + (max_pfn_mapped << PAGE_SHIFT))
+#endif
+ )) {
alias_cpa = *cpa;
alias_cpa.vaddr = (unsigned long) __va(cpa->pfn << PAGE_SHIFT);
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index a885a1019b8..749766c3c5c 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -449,7 +449,8 @@ int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
if (retval < 0)
return 0;
- if (pfn <= max_pfn_mapped &&
+ if (((pfn <= max_low_pfn_mapped) ||
+ (pfn >= (1UL<<(32 - PAGE_SHIFT)) && pfn <= max_pfn_mapped)) &&
ioremap_change_attr((unsigned long)__va(offset), size, flags) < 0) {
free_memtype(offset, offset + size);
printk(KERN_INFO