2 * Machine specific resource allocation for generic.
5 #include <linux/ioport.h>
7 #include <asm/std_resources.h>
9 #define romsignature(x) (*(unsigned short *)(x) == 0xaa55)
11 static struct resource system_rom_resource = {
15 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
18 static struct resource extension_rom_resource = {
19 .name = "Extension ROM",
22 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
25 static struct resource adapter_rom_resources[] = { {
26 .name = "Adapter ROM",
29 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
31 .name = "Adapter ROM",
34 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
36 .name = "Adapter ROM",
39 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
41 .name = "Adapter ROM",
44 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
46 .name = "Adapter ROM",
49 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
51 .name = "Adapter ROM",
54 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
57 #define ADAPTER_ROM_RESOURCES \
58 (sizeof adapter_rom_resources / sizeof adapter_rom_resources[0])
60 static struct resource video_rom_resource = {
64 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
67 static struct resource vram_resource = {
68 .name = "Video RAM area",
71 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
74 static struct resource standard_io_resources[] = { {
78 .flags = IORESOURCE_BUSY | IORESOURCE_IO
83 .flags = IORESOURCE_BUSY | IORESOURCE_IO
88 .flags = IORESOURCE_BUSY | IORESOURCE_IO
93 .flags = IORESOURCE_BUSY | IORESOURCE_IO
95 .name = "dma page reg",
98 .flags = IORESOURCE_BUSY | IORESOURCE_IO
103 .flags = IORESOURCE_BUSY | IORESOURCE_IO
108 .flags = IORESOURCE_BUSY | IORESOURCE_IO
113 .flags = IORESOURCE_BUSY | IORESOURCE_IO
116 #define STANDARD_IO_RESOURCES \
117 (sizeof standard_io_resources / sizeof standard_io_resources[0])
119 static int __init checksum(unsigned char *rom, unsigned long length)
121 unsigned char *p, sum = 0;
123 for (p = rom; p < rom + length; p++)
128 void __init probe_roms(void)
130 unsigned long start, length, upper;
135 upper = adapter_rom_resources[0].start;
136 for (start = video_rom_resource.start; start < upper; start += 2048) {
137 rom = isa_bus_to_virt(start);
138 if (!romsignature(rom))
141 video_rom_resource.start = start;
143 /* 0 < length <= 0x7f * 512, historically */
144 length = rom[2] * 512;
146 /* if checksum okay, trust length byte */
147 if (length && checksum(rom, length))
148 video_rom_resource.end = start + length - 1;
150 request_resource(&iomem_resource, &video_rom_resource);
154 start = (video_rom_resource.end + 1 + 2047) & ~2047UL;
159 request_resource(&iomem_resource, &system_rom_resource);
160 upper = system_rom_resource.start;
162 /* check for extension rom (ignore length byte!) */
163 rom = isa_bus_to_virt(extension_rom_resource.start);
164 if (romsignature(rom)) {
165 length = extension_rom_resource.end - extension_rom_resource.start + 1;
166 if (checksum(rom, length)) {
167 request_resource(&iomem_resource, &extension_rom_resource);
168 upper = extension_rom_resource.start;
172 /* check for adapter roms on 2k boundaries */
173 for (i = 0; i < ADAPTER_ROM_RESOURCES && start < upper; start += 2048) {
174 rom = isa_bus_to_virt(start);
175 if (!romsignature(rom))
178 /* 0 < length <= 0x7f * 512, historically */
179 length = rom[2] * 512;
181 /* but accept any length that fits if checksum okay */
182 if (!length || start + length > upper || !checksum(rom, length))
185 adapter_rom_resources[i].start = start;
186 adapter_rom_resources[i].end = start + length - 1;
187 request_resource(&iomem_resource, &adapter_rom_resources[i]);
189 start = adapter_rom_resources[i++].end & ~2047UL;
193 void __init request_graphics_resource(void)
195 request_resource(&iomem_resource, &vram_resource);
198 void __init request_standard_io_resources(void)
202 for (i = 0; i < STANDARD_IO_RESOURCES; i++)
203 request_resource(&ioport_resource, &standard_io_resources[i]);