aboutsummaryrefslogtreecommitdiff
path: root/arch
diff options
context:
space:
mode:
authorJack Steiner <steiner@sgi.com>2008-07-01 14:45:32 -0500
committerIngo Molnar <mingo@elte.hu>2008-07-09 07:43:23 +0200
commit3a9e189d69479736a0d0901c87ad08c9e328b389 (patch)
treee08bc871290cba63e8c8038a77be6c0732e17a1f /arch
parentfc9036ea1a4b14229788e6df3936b451a6abac98 (diff)
x86: map UV chipset space - pagetable
Add boot-time function for creating additional 2MB page table entries for mapping chipset specific cached/uncached ranges. Signed-off-by: Jack Steiner <steiner@sgi.com> Cc: linux-mm@kvack.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/mm/init_64.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 77d129d62c9..57d5eff754c 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -202,6 +202,46 @@ set_pte_vaddr(unsigned long vaddr, pte_t pteval)
}
/*
+ * Create large page table mappings for a range of physical addresses.
+ */
+static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
+ pgprot_t prot)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+
+ 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)) {
+ pud = (pud_t *) spp_getpage();
+ set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE |
+ _PAGE_USER));
+ }
+ pud = pud_offset(pgd, (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_KERNEL_LARGE);
+}
+
+void __init init_extra_mapping_uc(unsigned long phys, unsigned long size)
+{
+ __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE);
+}
+
+/*
* The head.S code sets up the kernel high mapping:
*
* from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)