diff options
Diffstat (limited to 'arch/x86/mm/init_64.c')
| -rw-r--r-- | arch/x86/mm/init_64.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 77d129d62c97..57d5eff754c9 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) |