500 lines
14 KiB
C
500 lines
14 KiB
C
// Option rom scanning code.
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//
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// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
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// Copyright (C) 2002 MandrakeSoft S.A.
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//
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// This file may be distributed under the terms of the GNU LGPLv3 license.
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#include "bregs.h" // struct bregs
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#include "config.h" // CONFIG_*
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#include "farptr.h" // FLATPTR_TO_SEG
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#include "biosvar.h" // GET_IVT
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#include "hw/pci.h" // pci_config_readl
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#include "hw/pcidevice.h" // foreachpci
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#include "hw/pci_ids.h" // PCI_CLASS_DISPLAY_VGA
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#include "hw/pci_regs.h" // PCI_ROM_ADDRESS
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#include "malloc.h" // rom_confirm
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#include "output.h" // dprintf
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#include "romfile.h" // romfile_loadint
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#include "stacks.h" // farcall16big
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#include "std/optionrom.h" // struct rom_header
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#include "std/pnpbios.h" // PNP_SIGNATURE
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#include "string.h" // memset
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#include "util.h" // get_pnp_offset
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#include "tcgbios.h" // tpm_*
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static int EnforceChecksum, S3ResumeVga, RunPCIroms;
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/****************************************************************
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* Helper functions
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****************************************************************/
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// Execute a given option rom.
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static void
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__callrom(struct rom_header *rom, u16 offset, u16 bdf)
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{
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u16 seg = FLATPTR_TO_SEG(rom);
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dprintf(1, "Running option rom at %04x:%04x\n", seg, offset);
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struct bregs br;
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memset(&br, 0, sizeof(br));
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br.flags = F_IF;
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br.ax = bdf;
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br.bx = 0xffff;
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br.dx = 0xffff;
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br.es = SEG_BIOS;
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br.di = get_pnp_offset();
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br.code = SEGOFF(seg, offset);
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start_preempt();
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farcall16big(&br);
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finish_preempt();
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}
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// Execute a given option rom at the standard entry vector.
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void
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callrom(struct rom_header *rom, u16 bdf)
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{
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__callrom(rom, OPTION_ROM_INITVECTOR, bdf);
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}
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// Execute a BCV option rom registered via add_bcv().
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void
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call_bcv(u16 seg, u16 ip)
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{
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__callrom(MAKE_FLATPTR(seg, 0), ip, 0);
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}
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// Verify that an option rom looks valid
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static int
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is_valid_rom(struct rom_header *rom)
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{
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dprintf(6, "Checking rom %p (sig %x size %d)\n"
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, rom, rom->signature, rom->size);
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if (rom->signature != OPTION_ROM_SIGNATURE)
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return 0;
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if (! rom->size)
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return 0;
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u32 len = rom->size * 512;
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u8 sum = checksum(rom, len);
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if (sum != 0) {
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dprintf(1, "Found option rom with bad checksum: loc=%p len=%d sum=%x\n"
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, rom, len, sum);
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if (EnforceChecksum)
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return 0;
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}
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return 1;
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}
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// Check if a valid option rom has a pnp struct; return it if so.
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static struct pnp_data *
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get_pnp_rom(struct rom_header *rom)
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{
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struct pnp_data *pnp = (void*)((u8*)rom + rom->pnpoffset);
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if (pnp->signature != PNP_SIGNATURE)
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return NULL;
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return pnp;
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}
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// Check for multiple pnp option rom headers.
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static struct pnp_data *
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get_pnp_next(struct rom_header *rom, struct pnp_data *pnp)
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{
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if (! pnp->nextoffset)
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return NULL;
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pnp = (void*)((u8*)rom + pnp->nextoffset);
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if (pnp->signature != PNP_SIGNATURE)
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return NULL;
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return pnp;
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}
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// Check if a valid option rom has a pci struct; return it if so.
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static struct pci_data *
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get_pci_rom(struct rom_header *rom)
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{
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struct pci_data *pd = (void*)((u32)rom + rom->pcioffset);
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if (pd->signature != PCI_ROM_SIGNATURE)
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return NULL;
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if (rom->pcioffset & 3)
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dprintf(1, "WARNING! Found unaligned PCI rom (vd=%04x:%04x)\n"
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, pd->vendor, pd->device);
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return pd;
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}
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// Run rom init code and note rom size.
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static int
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init_optionrom(struct rom_header *rom, u16 bdf, int isvga)
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{
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if (! is_valid_rom(rom))
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return -1;
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struct rom_header *newrom = rom_reserve(rom->size * 512);
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if (!newrom) {
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warn_noalloc();
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return -1;
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}
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if (newrom != rom)
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memmove(newrom, rom, rom->size * 512);
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tpm_option_rom(newrom, rom->size * 512);
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if (isvga || get_pnp_rom(newrom))
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// Only init vga and PnP roms here.
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callrom(newrom, bdf);
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return rom_confirm(newrom->size * 512);
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}
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#define RS_PCIROM (1LL<<33)
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static void
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setRomSource(u64 *sources, struct rom_header *rom, u64 source)
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{
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if (sources)
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sources[((u32)rom - BUILD_ROM_START) / OPTION_ROM_ALIGN] = source;
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}
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static int
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getRomPriority(u64 *sources, struct rom_header *rom, int instance)
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{
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u64 source = sources[((u32)rom - BUILD_ROM_START) / OPTION_ROM_ALIGN];
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if (!source)
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return -1;
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if (source & RS_PCIROM)
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return bootprio_find_pci_rom((void*)(u32)source, instance);
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struct romfile_s *file = (void*)(u32)source;
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return bootprio_find_named_rom(file->name, instance);
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}
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/****************************************************************
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* Roms in CBFS
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****************************************************************/
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static struct rom_header *
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deploy_romfile(struct romfile_s *file)
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{
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u32 size = file->size;
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struct rom_header *rom = rom_reserve(size);
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if (!rom) {
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warn_noalloc();
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return NULL;
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}
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int ret = file->copy(file, rom, size);
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if (ret <= 0)
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return NULL;
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return rom;
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}
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// Run all roms in a given CBFS directory.
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static void
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run_file_roms(const char *prefix, int isvga, u64 *sources)
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{
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struct romfile_s *file = NULL;
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for (;;) {
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file = romfile_findprefix(prefix, file);
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if (!file)
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break;
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struct rom_header *rom = deploy_romfile(file);
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if (rom) {
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setRomSource(sources, rom, (u32)file);
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init_optionrom(rom, 0, isvga);
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}
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}
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}
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/****************************************************************
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* PCI roms
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****************************************************************/
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// Verify device is a vga device with legacy address decoding enabled.
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int
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is_pci_vga(struct pci_device *pci)
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{
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if (pci->class != PCI_CLASS_DISPLAY_VGA)
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return 0;
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u16 cmd = pci_config_readw(pci->bdf, PCI_COMMAND);
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if (!(cmd & PCI_COMMAND_IO && cmd & PCI_COMMAND_MEMORY))
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return 0;
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while (pci->parent) {
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pci = pci->parent;
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u32 ctrl = pci_config_readb(pci->bdf, PCI_BRIDGE_CONTROL);
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if (!(ctrl & PCI_BRIDGE_CTL_VGA))
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return 0;
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}
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return 1;
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}
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// Copy a rom to its permanent location below 1MiB
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static struct rom_header *
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copy_rom(struct rom_header *rom)
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{
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u32 romsize = rom->size * 512;
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struct rom_header *newrom = rom_reserve(romsize);
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if (!newrom) {
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warn_noalloc();
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return NULL;
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}
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dprintf(4, "Copying option rom (size %d) from %p to %p\n"
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, romsize, rom, newrom);
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iomemcpy(newrom, rom, romsize);
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return newrom;
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}
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// Map the option rom of a given PCI device.
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static struct rom_header *
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map_pcirom(struct pci_device *pci)
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{
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dprintf(6, "Attempting to map option rom on dev %pP\n", pci);
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if ((pci->header_type & 0x7f) != PCI_HEADER_TYPE_NORMAL) {
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dprintf(6, "Skipping non-normal pci device (type=%x)\n"
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, pci->header_type);
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return NULL;
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}
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u16 bdf = pci->bdf;
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u32 orig = pci_config_readl(bdf, PCI_ROM_ADDRESS);
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pci_config_writel(bdf, PCI_ROM_ADDRESS, ~PCI_ROM_ADDRESS_ENABLE);
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u32 sz = pci_config_readl(bdf, PCI_ROM_ADDRESS);
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dprintf(6, "Option rom sizing returned %x %x\n", orig, sz);
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orig &= ~PCI_ROM_ADDRESS_ENABLE;
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if (!sz || sz == 0xffffffff)
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goto fail;
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if (orig == sz || (u32)(orig + 4*1024*1024) < 20*1024*1024) {
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// Don't try to map to a pci addresses at its max, in the last
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// 4MiB of ram, or the first 16MiB of ram.
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dprintf(6, "Preset rom address doesn't look valid\n");
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goto fail;
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}
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// Looks like a rom - enable it.
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pci_config_writel(bdf, PCI_ROM_ADDRESS, orig | PCI_ROM_ADDRESS_ENABLE);
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struct rom_header *rom = (void*)orig;
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for (;;) {
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dprintf(5, "Inspecting possible rom at %p (vd=%04x:%04x bdf=%pP)\n"
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, rom, pci->vendor, pci->device, pci);
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if (rom->signature != OPTION_ROM_SIGNATURE) {
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dprintf(6, "No option rom signature (got %x)\n", rom->signature);
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goto fail;
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}
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struct pci_data *pd = get_pci_rom(rom);
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if (! pd) {
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dprintf(6, "No valid pci signature found\n");
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goto fail;
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}
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if (pd->vendor == pci->vendor && pd->device == pci->device
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&& pd->type == PCIROM_CODETYPE_X86)
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// A match
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break;
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dprintf(6, "Didn't match dev/ven (got %04x:%04x) or type (got %d)\n"
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, pd->vendor, pd->device, pd->type);
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if (pd->indicator & 0x80) {
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dprintf(6, "No more images left\n");
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goto fail;
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}
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rom = (void*)((u32)rom + pd->ilen * 512);
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}
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rom = copy_rom(rom);
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pci_config_writel(bdf, PCI_ROM_ADDRESS, orig);
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return rom;
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fail:
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// Not valid - restore original and exit.
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pci_config_writel(bdf, PCI_ROM_ADDRESS, orig);
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return NULL;
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}
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static int boot_irq_captured(void)
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{
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return GET_IVT(0x19).segoff != FUNC16(entry_19_official).segoff;
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}
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static void boot_irq_restore(void)
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{
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struct segoff_s seabios;
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seabios = FUNC16(entry_19_official);
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SET_IVT(0x19, seabios);
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}
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// Attempt to map and initialize the option rom on a given PCI device.
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static void
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init_pcirom(struct pci_device *pci, int isvga, u64 *sources)
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{
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dprintf(4, "Attempting to init PCI bdf %pP (vd %04x:%04x)\n"
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, pci, pci->vendor, pci->device);
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char fname[17];
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snprintf(fname, sizeof(fname), "pci%04x,%04x.rom"
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, pci->vendor, pci->device);
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struct romfile_s *file = romfile_find(fname);
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struct rom_header *rom = NULL;
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if (file)
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rom = deploy_romfile(file);
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else if (RunPCIroms > 1 || (RunPCIroms == 1 && isvga))
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rom = map_pcirom(pci);
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if (! rom)
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// No ROM present.
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return;
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int irq_was_captured = boot_irq_captured();
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struct pnp_data *pnp = get_pnp_rom(rom);
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setRomSource(sources, rom, RS_PCIROM | (u32)pci);
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init_optionrom(rom, pci->bdf, isvga);
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if (boot_irq_captured() && !irq_was_captured &&
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!file && !isvga && pnp) {
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// This PCI rom is misbehaving - recapture the boot irqs
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char *desc = MAKE_FLATPTR(FLATPTR_TO_SEG(rom), pnp->productname);
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dprintf(1, "PnP optionrom \"%s\" (bdf %pP) captured int19, restoring\n",
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desc, pci);
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boot_irq_restore();
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}
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}
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/****************************************************************
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* Non-VGA option rom init
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****************************************************************/
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void
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optionrom_setup(void)
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{
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if (! CONFIG_OPTIONROMS)
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return;
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dprintf(1, "Scan for option roms\n");
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u64 sources[(BUILD_BIOS_ADDR - BUILD_ROM_START) / OPTION_ROM_ALIGN];
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memset(sources, 0, sizeof(sources));
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u32 post_vga = rom_get_last();
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// Find and deploy PCI roms.
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struct pci_device *pci;
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foreachpci(pci) {
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if (pci->class == PCI_CLASS_DISPLAY_VGA ||
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pci->class == PCI_CLASS_DISPLAY_OTHER ||
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pci->have_driver)
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continue;
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init_pcirom(pci, 0, sources);
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}
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// Find and deploy CBFS roms not associated with a device.
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run_file_roms("genroms/", 0, sources);
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rom_reserve(0);
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// All option roms found and deployed - now build BEV/BCV vectors.
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u32 pos = post_vga;
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while (pos < rom_get_last()) {
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struct rom_header *rom = (void*)pos;
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if (! is_valid_rom(rom)) {
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pos += OPTION_ROM_ALIGN;
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continue;
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}
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pos += ALIGN(rom->size * 512, OPTION_ROM_ALIGN);
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struct pnp_data *pnp = get_pnp_rom(rom);
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if (! pnp) {
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// Legacy rom.
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boot_add_bcv(FLATPTR_TO_SEG(rom), OPTION_ROM_INITVECTOR, 0
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, getRomPriority(sources, rom, 0));
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continue;
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}
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// PnP rom - check for BEV and BCV boot capabilities.
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int instance = 0;
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while (pnp) {
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if (pnp->bev)
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boot_add_bev(FLATPTR_TO_SEG(rom), pnp->bev, pnp->productname
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, getRomPriority(sources, rom, instance++));
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else if (pnp->bcv)
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boot_add_bcv(FLATPTR_TO_SEG(rom), pnp->bcv, pnp->productname
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, getRomPriority(sources, rom, instance++));
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else
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break;
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pnp = get_pnp_next(rom, pnp);
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}
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}
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}
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/****************************************************************
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* VGA init
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****************************************************************/
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int ScreenAndDebug;
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struct rom_header *VgaROM;
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static void try_setup_display_other(void)
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{
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struct pci_device *pci;
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dprintf(1, "No VGA found, scan for other display\n");
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foreachpci(pci) {
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if (pci->class != PCI_CLASS_DISPLAY_OTHER)
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continue;
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struct rom_header *rom = map_pcirom(pci);
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if (!rom)
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continue;
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dprintf(1, "Other display found at %pP\n", pci);
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pci_config_maskw(pci->bdf, PCI_COMMAND, 0,
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PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
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init_optionrom(rom, pci->bdf, 1);
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return;
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}
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}
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// Call into vga code to turn on console.
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void
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vgarom_setup(void)
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{
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int have_vga = 0;
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if (! CONFIG_OPTIONROMS)
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return;
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dprintf(1, "Scan for VGA option rom\n");
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// Load some config settings that impact VGA.
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EnforceChecksum = romfile_loadint("etc/optionroms-checksum", 1);
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S3ResumeVga = romfile_loadint("etc/s3-resume-vga-init", CONFIG_QEMU);
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RunPCIroms = romfile_loadint("etc/pci-optionrom-exec", 2);
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ScreenAndDebug = romfile_loadint("etc/screen-and-debug", 1);
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// Clear option rom memory
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memset((void*)BUILD_ROM_START, 0, rom_get_max() - BUILD_ROM_START);
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// Find and deploy PCI VGA rom.
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struct pci_device *pci;
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foreachpci(pci) {
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if (!is_pci_vga(pci))
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continue;
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vgahook_setup(pci);
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init_pcirom(pci, 1, NULL);
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have_vga = 1;
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break;
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}
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if (!have_vga)
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try_setup_display_other();
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// Find and deploy CBFS vga-style roms not associated with a device.
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run_file_roms("vgaroms/", 1, NULL);
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rom_reserve(0);
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if (rom_get_last() != BUILD_ROM_START)
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// VGA rom found
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VgaROM = (void*)BUILD_ROM_START;
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}
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void
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s3_resume_vga(void)
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{
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if (!S3ResumeVga)
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return;
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if (!VgaROM || ! is_valid_rom(VgaROM))
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return;
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callrom(VgaROM, 0);
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}
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