source: trunk/packages/xen-3.1/xen-3.1/linux-2.6-xen-sparse/arch/ia64/xen/util.c @ 34

Last change on this file since 34 was 34, checked in by hartmans, 18 years ago

Add xen and xen-common

File size: 2.8 KB
Line 
1/******************************************************************************
2 * arch/ia64/xen/util.c
3 * This file is the ia64 counterpart of drivers/xen/util.c
4 *
5 * Copyright (c) 2006 Isaku Yamahata <yamahata at valinux co jp>
6 *                    VA Linux Systems Japan K.K.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21 *
22 */
23
24#include <linux/mm.h>
25#include <linux/module.h>
26#include <linux/slab.h>
27#include <linux/vmalloc.h>
28#include <asm/uaccess.h>
29#include <xen/driver_util.h>
30#include <xen/interface/memory.h>
31#include <asm/hypercall.h>
32
33struct vm_struct *alloc_vm_area(unsigned long size)
34{
35        int order;
36        unsigned long virt;
37        unsigned long nr_pages;
38        struct vm_struct* area;
39       
40        order = get_order(size);
41        virt = __get_free_pages(GFP_KERNEL, order);
42        if (virt == 0) {
43                goto err0;
44        }
45        nr_pages = 1 << order;
46        scrub_pages(virt, nr_pages);
47       
48        area = kmalloc(sizeof(*area), GFP_KERNEL);
49        if (area == NULL) {
50                goto err1;
51        }
52       
53        area->flags = VM_IOREMAP;//XXX
54        area->addr = (void*)virt;
55        area->size = size;
56        area->pages = NULL; //XXX
57        area->nr_pages = nr_pages;
58        area->phys_addr = 0;    /* xenbus_map_ring_valloc uses this field!  */
59
60        return area;
61
62err1:
63        free_pages(virt, order);
64err0:
65        return NULL;
66       
67}
68EXPORT_SYMBOL_GPL(alloc_vm_area);
69
70void free_vm_area(struct vm_struct *area)
71{
72        unsigned int order = get_order(area->size);
73        unsigned long i;
74        unsigned long phys_addr = __pa(area->addr);
75
76        // This area is used for foreign page mappping.
77        // So underlying machine page may not be assigned.
78        for (i = 0; i < (1 << order); i++) {
79                unsigned long ret;
80                unsigned long gpfn = (phys_addr >> PAGE_SHIFT) + i;
81                struct xen_memory_reservation reservation = {
82                        .nr_extents   = 1,
83                        .address_bits = 0,
84                        .extent_order = 0,
85                        .domid        = DOMID_SELF
86                };
87                set_xen_guest_handle(reservation.extent_start, &gpfn);
88                ret = HYPERVISOR_memory_op(XENMEM_populate_physmap,
89                                           &reservation);
90                BUG_ON(ret != 1);
91        }
92        free_pages((unsigned long)area->addr, order);
93        kfree(area);
94}
95EXPORT_SYMBOL_GPL(free_vm_area);
96
97/*
98 * Local variables:
99 *  c-file-style: "linux"
100 *  indent-tabs-mode: t
101 *  c-indent-level: 8
102 *  c-basic-offset: 8
103 *  tab-width: 8
104 * End:
105 */
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