270 lines
6.3 KiB
C
270 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#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 <linux/export.h>
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#include <asm/probe_roms.h>
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#include <asm/pci-direct.h>
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#include <asm/e820/api.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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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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/* does this oprom support the given pci device, or any of the devices
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* that the driver supports?
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*/
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static bool match_id(struct pci_dev *pdev, unsigned short vendor, unsigned short device)
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{
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struct pci_driver *drv = pdev->driver;
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const struct pci_device_id *id;
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if (pdev->vendor == vendor && pdev->device == device)
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return true;
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for (id = drv ? drv->id_table : NULL; id && id->vendor; id++)
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if (id->vendor == vendor && id->device == device)
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break;
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return id && id->vendor;
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}
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static bool probe_list(struct pci_dev *pdev, unsigned short vendor,
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const void *rom_list)
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{
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unsigned short device;
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do {
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if (get_kernel_nofault(device, rom_list) != 0)
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device = 0;
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if (device && match_id(pdev, vendor, device))
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break;
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rom_list += 2;
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} while (device);
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return !!device;
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}
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static struct resource *find_oprom(struct pci_dev *pdev)
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{
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struct resource *oprom = NULL;
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int i;
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for (i = 0; i < ARRAY_SIZE(adapter_rom_resources); i++) {
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struct resource *res = &adapter_rom_resources[i];
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unsigned short offset, vendor, device, list, rev;
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const void *rom;
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if (res->end == 0)
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break;
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rom = isa_bus_to_virt(res->start);
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if (get_kernel_nofault(offset, rom + 0x18) != 0)
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continue;
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if (get_kernel_nofault(vendor, rom + offset + 0x4) != 0)
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continue;
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if (get_kernel_nofault(device, rom + offset + 0x6) != 0)
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continue;
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if (match_id(pdev, vendor, device)) {
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oprom = res;
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break;
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}
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if (get_kernel_nofault(list, rom + offset + 0x8) == 0 &&
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get_kernel_nofault(rev, rom + offset + 0xc) == 0 &&
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rev >= 3 && list &&
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probe_list(pdev, vendor, rom + offset + list)) {
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oprom = res;
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break;
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}
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}
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return oprom;
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}
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void __iomem *pci_map_biosrom(struct pci_dev *pdev)
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{
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struct resource *oprom = find_oprom(pdev);
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if (!oprom)
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return NULL;
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return ioremap(oprom->start, resource_size(oprom));
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}
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EXPORT_SYMBOL(pci_map_biosrom);
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void pci_unmap_biosrom(void __iomem *image)
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{
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iounmap(image);
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}
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EXPORT_SYMBOL(pci_unmap_biosrom);
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size_t pci_biosrom_size(struct pci_dev *pdev)
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{
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struct resource *oprom = find_oprom(pdev);
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return oprom ? resource_size(oprom) : 0;
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}
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EXPORT_SYMBOL(pci_biosrom_size);
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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 get_kernel_nofault(sig, ptr) == 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 && get_kernel_nofault(c, rom++) == 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 (get_kernel_nofault(c, rom + 2) != 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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/* system rom */
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request_resource(&iomem_resource, &system_rom_resource);
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upper = system_rom_resource.start;
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/* 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 = resource_size(&extension_rom_resource);
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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;
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}
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}
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/* check for adapter roms on 2k boundaries */
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for (i = 0; i < ARRAY_SIZE(adapter_rom_resources) && 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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if (get_kernel_nofault(c, rom + 2) != 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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/* but accept any length that fits if checksum okay */
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if (!length || start + length > upper || !romchecksum(rom, length))
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continue;
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adapter_rom_resources[i].start = start;
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adapter_rom_resources[i].end = start + length - 1;
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request_resource(&iomem_resource, &adapter_rom_resources[i]);
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start = adapter_rom_resources[i++].end & ~2047UL;
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}
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}
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