diff options
Diffstat (limited to 'arch/openrisc/mm/init.c')
| -rw-r--r-- | arch/openrisc/mm/init.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/openrisc/mm/init.c b/arch/openrisc/mm/init.c index 1dcd78c8f0e9..d0cb1a0126f9 100644 --- a/arch/openrisc/mm/init.c +++ b/arch/openrisc/mm/init.c @@ -207,6 +207,43 @@ void __init mem_init(void) return; } +static int __init map_page(unsigned long va, phys_addr_t pa, pgprot_t prot) +{ + p4d_t *p4d; + pud_t *pud; + pmd_t *pmd; + pte_t *pte; + + p4d = p4d_offset(pgd_offset_k(va), va); + pud = pud_offset(p4d, va); + pmd = pmd_offset(pud, va); + pte = pte_alloc_kernel(pmd, va); + + if (pte == NULL) + return -ENOMEM; + + if (pgprot_val(prot)) + set_pte_at(&init_mm, va, pte, pfn_pte(pa >> PAGE_SHIFT, prot)); + else + pte_clear(&init_mm, va, pte); + + local_flush_tlb_page(NULL, va); + return 0; +} + +void __init __set_fixmap(enum fixed_addresses idx, + phys_addr_t phys, pgprot_t prot) +{ + unsigned long address = __fix_to_virt(idx); + + if (idx >= __end_of_fixed_addresses) { + BUG(); + return; + } + + map_page(address, phys, prot); +} + static const pgprot_t protection_map[16] = { [VM_NONE] = PAGE_NONE, [VM_READ] = PAGE_READONLY_X, |