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fd940934 KP |
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); |