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269 lines
6.3 KiB
269 lines
6.3 KiB
// 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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