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Viewing changes to arch/x86/kernel/probe_roms_32.c

  • Committer: Bazaar Package Importer
  • Author(s): Paolo Pisati
  • Date: 2011-06-29 15:23:51 UTC
  • mfrom: (26.1.1 natty-proposed)
  • Revision ID: james.westby@ubuntu.com-20110629152351-xs96tm303d95rpbk
Tags: 3.0.0-1200.2
* Rebased against 3.0.0-6.7
* BSP from TI based on 3.0.0

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arch/x86/kernel/probe_roms_32.c
1
 
#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/uaccess.h>
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#include <linux/mmzone.h>
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#include <linux/ioport.h>
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#include <linux/seq_file.h>
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#include <linux/console.h>
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#include <linux/init.h>
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#include <linux/edd.h>
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#include <linux/dmi.h>
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#include <linux/pfn.h>
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#include <linux/pci.h>
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#include <asm/pci-direct.h>
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15
 
 
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#include <asm/e820.h>
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#include <asm/mmzone.h>
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#include <asm/setup.h>
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#include <asm/sections.h>
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#include <asm/io.h>
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#include <asm/setup_arch.h>
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23
 
static struct resource system_rom_resource = {
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        .name   = "System ROM",
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        .start  = 0xf0000,
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        .end    = 0xfffff,
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        .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
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};
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static struct resource extension_rom_resource = {
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        .name   = "Extension ROM",
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        .start  = 0xe0000,
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        .end    = 0xeffff,
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        .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
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};
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static struct resource adapter_rom_resources[] = { {
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        .name   = "Adapter ROM",
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        .start  = 0xc8000,
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        .end    = 0,
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        .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
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}, {
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        .name   = "Adapter ROM",
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        .start  = 0,
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        .end    = 0,
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        .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
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}, {
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        .name   = "Adapter ROM",
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        .start  = 0,
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        .end    = 0,
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        .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
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}, {
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        .name   = "Adapter ROM",
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        .start  = 0,
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        .end    = 0,
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        .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
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}, {
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        .name   = "Adapter ROM",
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        .start  = 0,
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        .end    = 0,
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        .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
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}, {
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        .name   = "Adapter ROM",
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        .start  = 0,
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        .end    = 0,
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        .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
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} };
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static struct resource video_rom_resource = {
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        .name   = "Video ROM",
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        .start  = 0xc0000,
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        .end    = 0xc7fff,
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        .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
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};
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#define ROMSIGNATURE 0xaa55
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static int __init romsignature(const unsigned char *rom)
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{
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        const unsigned short * const ptr = (const unsigned short *)rom;
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        unsigned short sig;
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        return probe_kernel_address(ptr, sig) == 0 && sig == ROMSIGNATURE;
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}
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static int __init romchecksum(const unsigned char *rom, unsigned long length)
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{
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        unsigned char sum, c;
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        for (sum = 0; length && probe_kernel_address(rom++, c) == 0; length--)
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                sum += c;
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        return !length && !sum;
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}
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void __init probe_roms(void)
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{
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        const unsigned char *rom;
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        unsigned long start, length, upper;
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        unsigned char c;
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        int i;
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        /* video rom */
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        upper = adapter_rom_resources[0].start;
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        for (start = video_rom_resource.start; start < upper; start += 2048) {
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                rom = isa_bus_to_virt(start);
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                if (!romsignature(rom))
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                        continue;
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                video_rom_resource.start = start;
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                if (probe_kernel_address(rom + 2, c) != 0)
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                        continue;
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                /* 0 < length <= 0x7f * 512, historically */
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                length = c * 512;
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                /* if checksum okay, trust length byte */
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                if (length && romchecksum(rom, length))
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                        video_rom_resource.end = start + length - 1;
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                request_resource(&iomem_resource, &video_rom_resource);
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                break;
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        }
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        start = (video_rom_resource.end + 1 + 2047) & ~2047UL;
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        if (start < upper)
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                start = upper;
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129
 
        /* system rom */
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        request_resource(&iomem_resource, &system_rom_resource);
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        upper = system_rom_resource.start;
132
 
 
133
 
        /* check for extension rom (ignore length byte!) */
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        rom = isa_bus_to_virt(extension_rom_resource.start);
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        if (romsignature(rom)) {
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                length = extension_rom_resource.end - extension_rom_resource.start + 1;
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                if (romchecksum(rom, length)) {
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                        request_resource(&iomem_resource, &extension_rom_resource);
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                        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);
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                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
 
}
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