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authorIngo Molnar <mingo@elte.hu>2008-07-18 16:39:59 -0400
committerIngo Molnar <mingo@elte.hu>2008-07-18 16:39:59 -0400
commit0679c2f47d50651018dd5e0bf35330f6e6ae35ec (patch)
tree2df65ebb958f930abf0b7ad35fd6e528398b1679 /arch/x86/kernel/probe_roms_32.c
parent76fbc263ff7e42ce8b21b8aee176e3c74b45f81a (diff)
parent5b664cb235e97afbf34db9c4d77f08ebd725335e (diff)
Merge branch 'linus' into pci-for-jesse
Diffstat (limited to 'arch/x86/kernel/probe_roms_32.c')
-rw-r--r--arch/x86/kernel/probe_roms_32.c166
1 files changed, 166 insertions, 0 deletions
diff --git a/arch/x86/kernel/probe_roms_32.c b/arch/x86/kernel/probe_roms_32.c
new file mode 100644
index 000000000000..675a48c404a5
--- /dev/null
+++ b/arch/x86/kernel/probe_roms_32.c
@@ -0,0 +1,166 @@
1#include <linux/sched.h>
2#include <linux/mm.h>
3#include <linux/uaccess.h>
4#include <linux/mmzone.h>
5#include <linux/ioport.h>
6#include <linux/seq_file.h>
7#include <linux/console.h>
8#include <linux/init.h>
9#include <linux/edd.h>
10#include <linux/dmi.h>
11#include <linux/pfn.h>
12#include <linux/pci.h>
13#include <asm/pci-direct.h>
14
15
16#include <asm/e820.h>
17#include <asm/mmzone.h>
18#include <asm/setup.h>
19#include <asm/sections.h>
20#include <asm/io.h>
21#include <setup_arch.h>
22
23static struct resource system_rom_resource = {
24 .name = "System ROM",
25 .start = 0xf0000,
26 .end = 0xfffff,
27 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
28};
29
30static struct resource extension_rom_resource = {
31 .name = "Extension ROM",
32 .start = 0xe0000,
33 .end = 0xeffff,
34 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
35};
36
37static struct resource adapter_rom_resources[] = { {
38 .name = "Adapter ROM",
39 .start = 0xc8000,
40 .end = 0,
41 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
42}, {
43 .name = "Adapter ROM",
44 .start = 0,
45 .end = 0,
46 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
47}, {
48 .name = "Adapter ROM",
49 .start = 0,
50 .end = 0,
51 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
52}, {
53 .name = "Adapter ROM",
54 .start = 0,
55 .end = 0,
56 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
57}, {
58 .name = "Adapter ROM",
59 .start = 0,
60 .end = 0,
61 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
62}, {
63 .name = "Adapter ROM",
64 .start = 0,
65 .end = 0,
66 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
67} };
68
69static struct resource video_rom_resource = {
70 .name = "Video ROM",
71 .start = 0xc0000,
72 .end = 0xc7fff,
73 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
74};
75
76#define ROMSIGNATURE 0xaa55
77
78static int __init romsignature(const unsigned char *rom)
79{
80 const unsigned short * const ptr = (const unsigned short *)rom;
81 unsigned short sig;
82
83 return probe_kernel_address(ptr, sig) == 0 && sig == ROMSIGNATURE;
84}
85
86static int __init romchecksum(const unsigned char *rom, unsigned long length)
87{
88 unsigned char sum, c;
89
90 for (sum = 0; length && probe_kernel_address(rom++, c) == 0; length--)
91 sum += c;
92 return !length && !sum;
93}
94
95void __init probe_roms(void)
96{
97 const unsigned char *rom;
98 unsigned long start, length, upper;
99 unsigned char c;
100 int i;
101
102 /* video rom */
103 upper = adapter_rom_resources[0].start;
104 for (start = video_rom_resource.start; start < upper; start += 2048) {
105 rom = isa_bus_to_virt(start);
106 if (!romsignature(rom))
107 continue;
108
109 video_rom_resource.start = start;
110
111 if (probe_kernel_address(rom + 2, c) != 0)
112 continue;
113
114 /* 0 < length <= 0x7f * 512, historically */
115 length = c * 512;
116
117 /* if checksum okay, trust length byte */
118 if (length && romchecksum(rom, length))
119 video_rom_resource.end = start + length - 1;
120
121 request_resource(&iomem_resource, &video_rom_resource);
122 break;
123 }
124
125 start = (video_rom_resource.end + 1 + 2047) & ~2047UL;
126 if (start < upper)
127 start = upper;
128
129 /* system rom */
130 request_resource(&iomem_resource, &system_rom_resource);
131 upper = system_rom_resource.start;
132
133 /* check for extension rom (ignore length byte!) */
134 rom = isa_bus_to_virt(extension_rom_resource.start);
135 if (romsignature(rom)) {
136 length = extension_rom_resource.end - extension_rom_resource.start + 1;
137 if (romchecksum(rom, length)) {
138 request_resource(&iomem_resource, &extension_rom_resource);
139 upper = extension_rom_resource.start;
140 }
141 }
142
143 /* check for adapter roms on 2k boundaries */
144 for (i = 0; i < ARRAY_SIZE(adapter_rom_resources) && start < upper; start += 2048) {
145 rom = isa_bus_to_virt(start);
146 if (!romsignature(rom))
147 continue;
148
149 if (probe_kernel_address(rom + 2, c) != 0)
150 continue;
151
152 /* 0 < length <= 0x7f * 512, historically */
153 length = c * 512;
154
155 /* but accept any length that fits if checksum okay */
156 if (!length || start + length > upper || !romchecksum(rom, length))
157 continue;
158
159 adapter_rom_resources[i].start = start;
160 adapter_rom_resources[i].end = start + length - 1;
161 request_resource(&iomem_resource, &adapter_rom_resources[i]);
162
163 start = adapter_rom_resources[i++].end & ~2047UL;
164 }
165}
166