| // Option rom scanning code. |
| // |
| // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net> |
| // Copyright (C) 2002 MandrakeSoft S.A. |
| // |
| // This file may be distributed under the terms of the GNU LGPLv3 license. |
| |
| #include "bregs.h" // struct bregs |
| #include "farptr.h" // FLATPTR_TO_SEG |
| #include "config.h" // CONFIG_* |
| #include "util.h" // dprintf |
| #include "pci.h" // pci_find_class |
| #include "pci_regs.h" // PCI_ROM_ADDRESS |
| #include "pci_ids.h" // PCI_CLASS_DISPLAY_VGA |
| #include "boot.h" // IPL |
| |
| |
| /**************************************************************** |
| * Definitions |
| ****************************************************************/ |
| |
| struct rom_header { |
| u16 signature; |
| u8 size; |
| u8 initVector[4]; |
| u8 reserved[17]; |
| u16 pcioffset; |
| u16 pnpoffset; |
| } PACKED; |
| |
| struct pci_data { |
| u32 signature; |
| u16 vendor; |
| u16 device; |
| u16 vitaldata; |
| u16 dlen; |
| u8 drevision; |
| u8 class_lo; |
| u16 class_hi; |
| u16 ilen; |
| u16 irevision; |
| u8 type; |
| u8 indicator; |
| u16 reserved; |
| } PACKED; |
| |
| struct pnp_data { |
| u32 signature; |
| u8 revision; |
| u8 len; |
| u16 nextoffset; |
| u8 reserved_08; |
| u8 checksum; |
| u32 devid; |
| u16 manufacturer; |
| u16 productname; |
| u8 type_lo; |
| u16 type_hi; |
| u8 dev_flags; |
| u16 bcv; |
| u16 dv; |
| u16 bev; |
| u16 reserved_1c; |
| u16 staticresource; |
| } PACKED; |
| |
| #define OPTION_ROM_START 0xc0000 |
| #define OPTION_ROM_SIGNATURE 0xaa55 |
| #define OPTION_ROM_ALIGN 2048 |
| #define OPTION_ROM_INITVECTOR offsetof(struct rom_header, initVector[0]) |
| #define PCI_ROM_SIGNATURE 0x52494350 // PCIR |
| #define PCIROM_CODETYPE_X86 0 |
| |
| // Next available position for an option rom. |
| static u32 next_rom; |
| |
| |
| /**************************************************************** |
| * Helper functions |
| ****************************************************************/ |
| |
| // Execute a given option rom. |
| static void |
| callrom(struct rom_header *rom, u16 offset, u16 bdf) |
| { |
| u16 seg = FLATPTR_TO_SEG(rom); |
| dprintf(1, "Running option rom at %04x:%04x\n", seg, offset); |
| |
| struct bregs br; |
| memset(&br, 0, sizeof(br)); |
| br.ax = bdf; |
| br.bx = 0xffff; |
| br.dx = 0xffff; |
| br.es = SEG_BIOS; |
| br.di = get_pnp_offset(); |
| br.cs = seg; |
| br.ip = offset; |
| call16big(&br); |
| |
| debug_serial_setup(); |
| } |
| |
| // Execute a BCV option rom registered via add_bcv(). |
| void |
| call_bcv(u16 seg, u16 ip) |
| { |
| callrom(MAKE_FLATPTR(seg, 0), ip, 0); |
| } |
| |
| // Verify that an option rom looks valid |
| static int |
| is_valid_rom(struct rom_header *rom) |
| { |
| dprintf(6, "Checking rom %p (sig %x size %d)\n" |
| , rom, rom->signature, rom->size); |
| if (rom->signature != OPTION_ROM_SIGNATURE) |
| return 0; |
| if (! rom->size) |
| return 0; |
| u32 len = rom->size * 512; |
| u8 sum = checksum(rom, len); |
| if (sum != 0) { |
| dprintf(1, "Found option rom with bad checksum: loc=%p len=%d sum=%x\n" |
| , rom, len, sum); |
| return 0; |
| } |
| return 1; |
| } |
| |
| // Check if a valid option rom has a pnp struct; return it if so. |
| static struct pnp_data * |
| get_pnp_rom(struct rom_header *rom) |
| { |
| struct pnp_data *pnp = (struct pnp_data *)((u8*)rom + rom->pnpoffset); |
| if (pnp->signature != PNP_SIGNATURE) |
| return NULL; |
| return pnp; |
| } |
| |
| // Check for multiple pnp option rom headers. |
| static struct pnp_data * |
| get_pnp_next(struct rom_header *rom, struct pnp_data *pnp) |
| { |
| if (! pnp->nextoffset) |
| return NULL; |
| pnp = (struct pnp_data *)((u8*)rom + pnp->nextoffset); |
| if (pnp->signature != PNP_SIGNATURE) |
| return NULL; |
| return pnp; |
| } |
| |
| // Check if a valid option rom has a pci struct; return it if so. |
| static struct pci_data * |
| get_pci_rom(struct rom_header *rom) |
| { |
| struct pci_data *pci = (struct pci_data *)((u32)rom + rom->pcioffset); |
| if (pci->signature != PCI_ROM_SIGNATURE) |
| return NULL; |
| return pci; |
| } |
| |
| // Copy a rom to its permanent location below 1MiB |
| static struct rom_header * |
| copy_rom(struct rom_header *rom) |
| { |
| u32 romsize = rom->size * 512; |
| if (next_rom + romsize > BUILD_BIOS_ADDR) { |
| // Option rom doesn't fit. |
| dprintf(1, "Option rom %p doesn't fit.\n", rom); |
| return NULL; |
| } |
| dprintf(4, "Copying option rom (size %d) from %p to %x\n" |
| , romsize, rom, next_rom); |
| memcpy4((void*)next_rom, rom, romsize); |
| return (struct rom_header *)next_rom; |
| } |
| |
| // Check if an option rom is at a hardcoded location for a device. |
| static struct rom_header * |
| lookup_hardcode(u32 vendev) |
| { |
| if (OPTIONROM_VENDEV_1 |
| && ((OPTIONROM_VENDEV_1 >> 16) |
| | ((OPTIONROM_VENDEV_1 & 0xffff)) << 16) == vendev) |
| return copy_rom((struct rom_header *)OPTIONROM_MEM_1); |
| if (OPTIONROM_VENDEV_2 |
| && ((OPTIONROM_VENDEV_2 >> 16) |
| | ((OPTIONROM_VENDEV_2 & 0xffff)) << 16) == vendev) |
| return copy_rom((struct rom_header *)OPTIONROM_MEM_2); |
| int ret = cbfs_copy_optionrom((void*)next_rom, BUILD_BIOS_ADDR - next_rom |
| , vendev); |
| if (ret < 0) |
| return NULL; |
| return (struct rom_header *)next_rom; |
| } |
| |
| // Map the option rom of a given PCI device. |
| static struct rom_header * |
| map_optionrom(u16 bdf, u32 vendev) |
| { |
| dprintf(6, "Attempting to map option rom on dev %02x:%02x.%x\n" |
| , pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf), pci_bdf_to_fn(bdf)); |
| |
| u8 htype = pci_config_readb(bdf, PCI_HEADER_TYPE); |
| if ((htype & 0x7f) != PCI_HEADER_TYPE_NORMAL) { |
| dprintf(6, "Skipping non-normal pci device (type=%x)\n", htype); |
| return NULL; |
| } |
| |
| u32 orig = pci_config_readl(bdf, PCI_ROM_ADDRESS); |
| pci_config_writel(bdf, PCI_ROM_ADDRESS, ~PCI_ROM_ADDRESS_ENABLE); |
| u32 sz = pci_config_readl(bdf, PCI_ROM_ADDRESS); |
| |
| dprintf(6, "Option rom sizing returned %x %x\n", orig, sz); |
| orig &= ~PCI_ROM_ADDRESS_ENABLE; |
| if (!sz || sz == 0xffffffff) |
| goto fail; |
| |
| if (orig == sz || (u32)(orig + 4*1024*1024) < 20*1024*1024) { |
| // Don't try to map to a pci addresses at its max, in the last |
| // 4MiB of ram, or the first 16MiB of ram. |
| dprintf(6, "Preset rom address doesn't look valid\n"); |
| goto fail; |
| } |
| |
| // Looks like a rom - enable it. |
| pci_config_writel(bdf, PCI_ROM_ADDRESS, orig | PCI_ROM_ADDRESS_ENABLE); |
| |
| struct rom_header *rom = (struct rom_header *)orig; |
| for (;;) { |
| dprintf(5, "Inspecting possible rom at %p (dv=%x bdf=%x)\n" |
| , rom, vendev, bdf); |
| if (rom->signature != OPTION_ROM_SIGNATURE) { |
| dprintf(6, "No option rom signature (got %x)\n", rom->signature); |
| goto fail; |
| } |
| struct pci_data *pci = get_pci_rom(rom); |
| if (! pci) { |
| dprintf(6, "No valid pci signature found\n"); |
| goto fail; |
| } |
| |
| u32 vd = (pci->device << 16) | pci->vendor; |
| if (vd == vendev && pci->type == PCIROM_CODETYPE_X86) |
| // A match |
| break; |
| dprintf(6, "Didn't match dev/ven (got %x) or type (got %d)\n" |
| , vd, pci->type); |
| if (pci->indicator & 0x80) { |
| dprintf(6, "No more images left\n"); |
| goto fail; |
| } |
| rom = (struct rom_header *)((u32)rom + pci->ilen * 512); |
| } |
| |
| rom = copy_rom(rom); |
| pci_config_writel(bdf, PCI_ROM_ADDRESS, orig); |
| return rom; |
| fail: |
| // Not valid - restore original and exit. |
| pci_config_writel(bdf, PCI_ROM_ADDRESS, orig); |
| return NULL; |
| } |
| |
| // Adjust for the size of an option rom; allow it to resize. |
| static struct rom_header * |
| verifysize_optionrom(struct rom_header *rom, u16 bdf) |
| { |
| if (! is_valid_rom(rom)) |
| return NULL; |
| |
| if (get_pnp_rom(rom)) |
| // Init the PnP rom. |
| callrom(rom, OPTION_ROM_INITVECTOR, bdf); |
| |
| next_rom += ALIGN(rom->size * 512, OPTION_ROM_ALIGN); |
| |
| return rom; |
| } |
| |
| // Attempt to map and initialize the option rom on a given PCI device. |
| static struct rom_header * |
| init_optionrom(u16 bdf) |
| { |
| u32 vendev = pci_config_readl(bdf, PCI_VENDOR_ID); |
| dprintf(4, "Attempting to init PCI bdf %02x:%02x.%x (dev/ven %x)\n" |
| , pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf), pci_bdf_to_fn(bdf) |
| , vendev); |
| struct rom_header *rom = lookup_hardcode(vendev); |
| if (! rom) |
| rom = map_optionrom(bdf, vendev); |
| if (! rom) |
| // No ROM present. |
| return NULL; |
| return verifysize_optionrom(rom, bdf); |
| } |
| |
| |
| /**************************************************************** |
| * Non-VGA option rom init |
| ****************************************************************/ |
| |
| void |
| optionrom_setup() |
| { |
| if (! CONFIG_OPTIONROMS) |
| return; |
| |
| dprintf(1, "Scan for option roms\n"); |
| |
| u32 post_vga = next_rom; |
| |
| if (CONFIG_OPTIONROMS_DEPLOYED) { |
| // Option roms are already deployed on the system. |
| u32 pos = next_rom; |
| while (pos < BUILD_BIOS_ADDR) { |
| struct rom_header *rom = (struct rom_header *)pos; |
| if (! is_valid_rom(rom)) { |
| pos += OPTION_ROM_ALIGN; |
| continue; |
| } |
| if (get_pnp_rom(rom)) |
| callrom(rom, OPTION_ROM_INITVECTOR, 0); |
| pos += ALIGN(rom->size * 512, OPTION_ROM_ALIGN); |
| next_rom = pos; |
| } |
| } else { |
| // Find and deploy PCI roms. |
| int bdf, max; |
| foreachpci(bdf, max) { |
| u16 v = pci_config_readw(bdf, PCI_CLASS_DEVICE); |
| if (v == 0x0000 || v == 0xffff || v == PCI_CLASS_DISPLAY_VGA |
| || (CONFIG_ATA && v == PCI_CLASS_STORAGE_IDE)) |
| continue; |
| init_optionrom(bdf); |
| } |
| |
| // Find and deploy CBFS roms not associated with a device. |
| struct cbfs_file *tmp = NULL; |
| for (;;) { |
| tmp = cbfs_copy_gen_optionrom( |
| (void*)next_rom, BUILD_BIOS_ADDR - next_rom, tmp); |
| if (!tmp) |
| break; |
| verifysize_optionrom((void*)next_rom, 0); |
| } |
| } |
| |
| // All option roms found and deployed - now build BEV/BCV vectors. |
| |
| u32 pos = post_vga; |
| while (pos < next_rom) { |
| struct rom_header *rom = (struct rom_header *)pos; |
| if (! is_valid_rom(rom)) { |
| pos += OPTION_ROM_ALIGN; |
| continue; |
| } |
| pos += ALIGN(rom->size * 512, OPTION_ROM_ALIGN); |
| struct pnp_data *pnp = get_pnp_rom(rom); |
| if (! pnp) { |
| // Legacy rom. |
| add_bcv(FLATPTR_TO_SEG(rom), OPTION_ROM_INITVECTOR, 0); |
| continue; |
| } |
| // PnP rom. |
| if (pnp->bev) |
| // Can boot system - add to IPL list. |
| add_bev(FLATPTR_TO_SEG(rom), pnp->bev, pnp->productname); |
| else |
| // Check for BCV (there may be multiple). |
| while (pnp && pnp->bcv) { |
| add_bcv(FLATPTR_TO_SEG(rom), pnp->bcv, pnp->productname); |
| pnp = get_pnp_next(rom, pnp); |
| } |
| } |
| } |
| |
| |
| /**************************************************************** |
| * VGA init |
| ****************************************************************/ |
| |
| // Call into vga code to turn on console. |
| void |
| vga_setup() |
| { |
| if (! CONFIG_OPTIONROMS) |
| return; |
| |
| dprintf(1, "Scan for VGA option rom\n"); |
| next_rom = OPTION_ROM_START; |
| |
| if (CONFIG_OPTIONROMS_DEPLOYED) { |
| // Option roms are already deployed on the system. |
| struct rom_header *rom = (struct rom_header *)OPTION_ROM_START; |
| if (! is_valid_rom(rom)) |
| return; |
| callrom(rom, OPTION_ROM_INITVECTOR, 0); |
| next_rom += ALIGN(rom->size * 512, OPTION_ROM_ALIGN); |
| } else { |
| // Find and deploy PCI VGA rom. |
| int bdf = pci_find_class(PCI_CLASS_DISPLAY_VGA); |
| if (bdf < 0) |
| // Device not found |
| return; |
| |
| struct rom_header *rom = init_optionrom(bdf); |
| if (rom && !get_pnp_rom(rom)) |
| // Call rom even if it isn't a pnp rom. |
| callrom(rom, OPTION_ROM_INITVECTOR, bdf); |
| } |
| |
| dprintf(1, "Turning on vga console\n"); |
| struct bregs br; |
| memset(&br, 0, sizeof(br)); |
| br.ax = 0x0003; |
| call16_int(0x10, &br); |
| |
| // Write to screen. |
| printf("Starting SeaBIOS\n\n"); |
| } |