source: mainline/kernel/arch/xen32/src/mm/frame.c@ c049309

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since c049309 was c049309, checked in by Martin Decky <martin@…>, 19 years ago

xen32 cleanup
  • Property mode set to 100644
File size: 4.9 KB
Line 
1/*
2 * Copyright (C) 2001-2004 Jakub Jermar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup xen32mm
30 * @{
31 */
32/** @file
33 * @ingroup xen32mm
34 */
35
36#include <mm/frame.h>
37#include <arch/mm/frame.h>
38#include <mm/as.h>
39#include <config.h>
40#include <arch/boot/boot.h>
41#include <arch/hypercall.h>
42#include <panic.h>
43#include <debug.h>
44#include <align.h>
45#include <macros.h>
46
47#include <console/cmd.h>
48#include <console/kconsole.h>
49
50uintptr_t last_frame = 0;
51
52#define L0_PT_SHIFT 10
53#define L3_PT_SHIFT 0
54
55#define L0_PT_ENTRIES 1024
56#define L3_PT_ENTRIES 1024
57
58#define L0_INDEX_MASK (L0_PT_ENTRIES - 1)
59#define L3_INDEX_MASK (L3_PT_ENTRIES - 1)
60
61#define PFN2PTL0_INDEX(pfn) ((pfn >> L0_PT_SHIFT) & L0_INDEX_MASK)
62#define PFN2PTL3_INDEX(pfn) ((pfn >> L3_PT_SHIFT) & L3_INDEX_MASK)
63
64#define PAGE_MASK (~(PAGE_SIZE - 1))
65
66#define _PAGE_PRESENT 0x001UL
67#define _PAGE_RW 0x002UL
68#define _PAGE_USER 0x004UL
69#define _PAGE_PWT 0x008UL
70#define _PAGE_PCD 0x010UL
71#define _PAGE_ACCESSED 0x020UL
72#define _PAGE_DIRTY 0x040UL
73#define _PAGE_PAT 0x080UL
74#define _PAGE_PSE 0x080UL
75#define _PAGE_GLOBAL 0x100UL
76
77#define L0_PROT (_PAGE_PRESENT | _PAGE_ACCESSED)
78#define L3_PROT (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED)
79
80void frame_arch_init(void)
81{
82 if (config.cpu_active == 1) {
83 /* The only memory zone starts just after page table */
84 pfn_t start = ADDR2PFN(ALIGN_UP(KA2PA(start_info.ptl0), PAGE_SIZE)) + start_info.pt_frames;
85 size_t size = start_info.frames - start;
86
87 /* Create identity mapping */
88 pfn_t phys;
89 count_t count = 0;
90 for (phys = start; phys < start + size; phys++) {
91 mmu_update_t updates[L3_PT_ENTRIES];
92 pfn_t virt = ADDR2PFN(PA2KA(PFN2ADDR(phys)));
93
94 size_t ptl0_index = PFN2PTL0_INDEX(virt);
95 size_t ptl3_index = PFN2PTL3_INDEX(virt);
96
97 pte_t *ptl3 = (pte_t *) PFN2ADDR(start_info.ptl0[ptl0_index].frame_address);
98
99 if (ptl3 == 0) {
100 mmuext_op_t mmu_ext;
101
102 pfn_t virt2 = ADDR2PFN(PA2KA(PFN2ADDR(start)));
103
104 /* New L1 page table entry needed */
105 memsetb(PFN2ADDR(virt2), PAGE_SIZE, 0);
106
107 size_t ptl0_index2 = PFN2PTL0_INDEX(virt2);
108 size_t ptl3_index2 = PFN2PTL3_INDEX(virt2);
109 pte_t *ptl3_2 = (pte_t *) PFN2ADDR(start_info.ptl0[ptl0_index2].frame_address);
110
111 if (ptl3_2 == 0)
112 panic("Unable to find page table reference");
113
114 updates[count].ptr = (uintptr_t) &ptl3_2[ptl3_index2];
115 updates[count].val = PA2MA(PFN2ADDR(start)) | L0_PROT;
116 if (xen_mmu_update(updates, count + 1, NULL, DOMID_SELF) < 0)
117 panic("Unable to map new page table");
118 count = 0;
119
120 mmu_ext.cmd = MMUEXT_PIN_L1_TABLE;
121 mmu_ext.arg1.mfn = ADDR2PFN(PA2MA(PFN2ADDR(start)));
122 if (xen_mmuext_op(&mmu_ext, 1, NULL, DOMID_SELF) < 0)
123 panic("Error pinning new page table");
124
125 pte_t *ptl0 = (pte_t *) PA2MA(KA2PA(start_info.ptl0));
126
127 updates[count].ptr = (uintptr_t) &ptl0[ptl0_index];
128 updates[count].val = PA2MA(PFN2ADDR(start)) | L3_PROT;
129 if (xen_mmu_update(updates, count + 1, NULL, DOMID_SELF) < 0)
130 panic("Unable to update PTE for page table");
131 count = 0;
132
133 ptl3 = (pte_t *) PFN2ADDR(start_info.ptl0[ptl0_index].frame_address);
134 start++;
135 size--;
136 }
137
138 updates[count].ptr = (uintptr_t) &ptl3[ptl3_index];
139 updates[count].val = PA2MA(PFN2ADDR(phys)) | L3_PROT;
140 count++;
141
142 if ((count == L3_PT_ENTRIES) || (phys + 1 == start + size)) {
143 if (xen_mmu_update(updates, count, NULL, DOMID_SELF) < 0)
144 panic("Unable to update PTE");
145 count = 0;
146 }
147 }
148
149 zone_create(start, size, start, 0);
150 last_frame = start + size;
151 }
152}
153
154/** @}
155 */
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