projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 8d3d2106 IY |
1 | /****************************************************************************** |
| 2 | * grant_table.c | |
| 3 | * x86 specific part | |
| 4 | * | |
| 5 | * Granting foreign access to our memory reservation. | |
| 6 | * | |
| 7 | * Copyright (c) 2005-2006, Christopher Clark | |
| 8 | * Copyright (c) 2004-2005, K A Fraser | |
| 9 | * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp> | |
| 10 | * VA Linux Systems Japan. Split out x86 specific part. | |
| 11 | * | |
| 12 | * This program is free software; you can redistribute it and/or | |
| 13 | * modify it under the terms of the GNU General Public License version 2 | |
| 14 | * as published by the Free Software Foundation; or, when distributed | |
| 15 | * separately from the Linux kernel or incorporated into other | |
| 16 | * software packages, subject to the following license: | |
| 17 | * | |
| 18 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
| 19 | * of this source file (the "Software"), to deal in the Software without | |
| 20 | * restriction, including without limitation the rights to use, copy, modify, | |
| 21 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
| 22 | * and to permit persons to whom the Software is furnished to do so, subject to | |
| 23 | * the following conditions: | |
| 24 | * | |
| 25 | * The above copyright notice and this permission notice shall be included in | |
| 26 | * all copies or substantial portions of the Software. | |
| 27 | * | |
| 28 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| 29 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| 30 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| 31 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| 32 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
| 33 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
| 34 | * IN THE SOFTWARE. | |
| 35 | */ | |
| 36 | ||
| 37 | #include <linux/sched.h> | |
| 38 | #include <linux/mm.h> | |
| 39 | #include <linux/vmalloc.h> | |
| 40 | ||
| 41 | #include <xen/interface/xen.h> | |
| 42 | #include <xen/page.h> | |
| 43 | #include <xen/grant_table.h> | |
| 44 | ||
| 45 | #include <asm/pgtable.h> | |
| 46 | ||
| 47 | static int map_pte_fn(pte_t *pte, struct page *pmd_page, | |
| 48 | unsigned long addr, void *data) | |
| 49 | { | |
| 50 | unsigned long **frames = (unsigned long **)data; | |
| 51 | ||
| 52 | set_pte_at(&init_mm, addr, pte, mfn_pte((*frames)[0], PAGE_KERNEL)); | |
| 53 | (*frames)++; | |
| 54 | return 0; | |
| 55 | } | |
| 56 | ||
| 57 | static int unmap_pte_fn(pte_t *pte, struct page *pmd_page, | |
| 58 | unsigned long addr, void *data) | |
| 59 | { | |
| 60 | ||
| 61 | set_pte_at(&init_mm, addr, pte, __pte(0)); | |
| 62 | return 0; | |
| 63 | } | |
| 64 | ||
| 65 | int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes, | |
| 66 | unsigned long max_nr_gframes, | |
| 67 | struct grant_entry **__shared) | |
| 68 | { | |
| 69 | int rc; | |
| 70 | struct grant_entry *shared = *__shared; | |
| 71 | ||
| 72 | if (shared == NULL) { | |
| 73 | struct vm_struct *area = | |
| 74 | xen_alloc_vm_area(PAGE_SIZE * max_nr_gframes); | |
| 75 | BUG_ON(area == NULL); | |
| 76 | shared = area->addr; | |
| 77 | *__shared = shared; | |
| 78 | } | |
| 79 | ||
| 80 | rc = apply_to_page_range(&init_mm, (unsigned long)shared, | |
| 81 | PAGE_SIZE * nr_gframes, | |
| 82 | map_pte_fn, &frames); | |
| 83 | return rc; | |
| 84 | } | |
| 85 | ||
| 86 | void arch_gnttab_unmap_shared(struct grant_entry *shared, | |
| 87 | unsigned long nr_gframes) | |
| 88 | { | |
| 89 | apply_to_page_range(&init_mm, (unsigned long)shared, | |
| 90 | PAGE_SIZE * nr_gframes, unmap_pte_fn, NULL); | |
| 91 | } |