| Keith Packard | fd94093 | 2008-10-30 19:37:09 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright © 2008 Ingo Molnar |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| 17 | */ |
| 18 | |
| 19 | #include <asm/iomap.h> |
| 20 | #include <linux/module.h> |
| 21 | |
| 22 | /* Map 'pfn' using fixed map 'type' and protections 'prot' |
| 23 | */ |
| 24 | void * |
| 25 | iomap_atomic_prot_pfn(unsigned long pfn, enum km_type type, pgprot_t prot) |
| 26 | { |
| 27 | enum fixed_addresses idx; |
| 28 | unsigned long vaddr; |
| 29 | |
| 30 | pagefault_disable(); |
| 31 | |
| 32 | idx = type + KM_TYPE_NR*smp_processor_id(); |
| 33 | vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); |
| 34 | set_pte(kmap_pte-idx, pfn_pte(pfn, prot)); |
| 35 | arch_flush_lazy_mmu_mode(); |
| 36 | |
| 37 | return (void*) vaddr; |
| 38 | } |
| 39 | EXPORT_SYMBOL_GPL(iomap_atomic_prot_pfn); |
| 40 | |
| 41 | void |
| 42 | iounmap_atomic(void *kvaddr, enum km_type type) |
| 43 | { |
| 44 | unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; |
| 45 | enum fixed_addresses idx = type + KM_TYPE_NR*smp_processor_id(); |
| 46 | |
| 47 | /* |
| 48 | * Force other mappings to Oops if they'll try to access this pte |
| 49 | * without first remap it. Keeping stale mappings around is a bad idea |
| 50 | * also, in case the page changes cacheability attributes or becomes |
| 51 | * a protected page in a hypervisor. |
| 52 | */ |
| 53 | if (vaddr == __fix_to_virt(FIX_KMAP_BEGIN+idx)) |
| 54 | kpte_clear_flush(kmap_pte-idx, vaddr); |
| 55 | |
| 56 | arch_flush_lazy_mmu_mode(); |
| 57 | pagefault_enable(); |
| 58 | } |
| 59 | EXPORT_SYMBOL_GPL(iounmap_atomic); |