Merge commit '85082fd7cbe3173198aac0eb5e85ab1edcc6352c' into test-build
[linux-2.6] / arch / x86 / kernel / probe_roms_32.c
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
23 static 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
30 static 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
37 static 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
69 static 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
78 static 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
86 static 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
95 void __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