blob: fc992f649fe1e10ea55ce345f173581abe42f9c9 [file] [log] [blame]
// 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 "config.h" // CONFIG_*
#include "farptr.h" // FLATPTR_TO_SEG
#include "hw/pci.h" // pci_config_readl
#include "hw/pcidevice.h" // foreachpci
#include "hw/pci_ids.h" // PCI_CLASS_DISPLAY_VGA
#include "hw/pci_regs.h" // PCI_ROM_ADDRESS
#include "malloc.h" // rom_confirm
#include "output.h" // dprintf
#include "romfile.h" // romfile_loadint
#include "stacks.h" // farcall16big
#include "std/optionrom.h" // struct rom_header
#include "std/pnpbios.h" // PNP_SIGNATURE
#include "string.h" // memset
#include "util.h" // get_pnp_offset
#include "tcgbios.h" // tpm_*
static int EnforceChecksum, S3ResumeVga, RunPCIroms;
/****************************************************************
* 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.flags = F_IF;
br.ax = bdf;
br.bx = 0xffff;
br.dx = 0xffff;
br.es = SEG_BIOS;
br.di = get_pnp_offset();
br.code = SEGOFF(seg, offset);
start_preempt();
farcall16big(&br);
finish_preempt();
}
// Execute a given option rom at the standard entry vector.
void
callrom(struct rom_header *rom, u16 bdf)
{
__callrom(rom, OPTION_ROM_INITVECTOR, bdf);
}
// 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);
if (EnforceChecksum)
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 = (void*)((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 = (void*)((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 *pd = (void*)((u32)rom + rom->pcioffset);
if (pd->signature != PCI_ROM_SIGNATURE)
return NULL;
if (rom->pcioffset & 3)
dprintf(1, "WARNING! Found unaligned PCI rom (vd=%04x:%04x)\n"
, pd->vendor, pd->device);
return pd;
}
// Run rom init code and note rom size.
static int
init_optionrom(struct rom_header *rom, u16 bdf, int isvga)
{
if (! is_valid_rom(rom))
return -1;
struct rom_header *newrom = rom_reserve(rom->size * 512);
if (!newrom) {
warn_noalloc();
return -1;
}
if (newrom != rom)
memmove(newrom, rom, rom->size * 512);
tpm_option_rom(newrom, rom->size * 512);
if (isvga || get_pnp_rom(newrom))
// Only init vga and PnP roms here.
callrom(newrom, bdf);
return rom_confirm(newrom->size * 512);
}
#define RS_PCIROM (1LL<<33)
static void
setRomSource(u64 *sources, struct rom_header *rom, u64 source)
{
if (sources)
sources[((u32)rom - BUILD_ROM_START) / OPTION_ROM_ALIGN] = source;
}
static int
getRomPriority(u64 *sources, struct rom_header *rom, int instance)
{
u64 source = sources[((u32)rom - BUILD_ROM_START) / OPTION_ROM_ALIGN];
if (!source)
return -1;
if (source & RS_PCIROM)
return bootprio_find_pci_rom((void*)(u32)source, instance);
struct romfile_s *file = (void*)(u32)source;
return bootprio_find_named_rom(file->name, instance);
}
/****************************************************************
* Roms in CBFS
****************************************************************/
static struct rom_header *
deploy_romfile(struct romfile_s *file)
{
u32 size = file->size;
struct rom_header *rom = rom_reserve(size);
if (!rom) {
warn_noalloc();
return NULL;
}
int ret = file->copy(file, rom, size);
if (ret <= 0)
return NULL;
return rom;
}
// Run all roms in a given CBFS directory.
static void
run_file_roms(const char *prefix, int isvga, u64 *sources)
{
struct romfile_s *file = NULL;
for (;;) {
file = romfile_findprefix(prefix, file);
if (!file)
break;
struct rom_header *rom = deploy_romfile(file);
if (rom) {
setRomSource(sources, rom, (u32)file);
init_optionrom(rom, 0, isvga);
}
}
}
/****************************************************************
* PCI roms
****************************************************************/
// Verify device is a vga device with legacy address decoding enabled.
int
is_pci_vga(struct pci_device *pci)
{
if (pci->class != PCI_CLASS_DISPLAY_VGA)
return 0;
u16 cmd = pci_config_readw(pci->bdf, PCI_COMMAND);
if (!(cmd & PCI_COMMAND_IO && cmd & PCI_COMMAND_MEMORY))
return 0;
while (pci->parent) {
pci = pci->parent;
u32 ctrl = pci_config_readb(pci->bdf, PCI_BRIDGE_CONTROL);
if (!(ctrl & PCI_BRIDGE_CTL_VGA))
return 0;
}
return 1;
}
// Copy a rom to its permanent location below 1MiB
static struct rom_header *
copy_rom(struct rom_header *rom)
{
u32 romsize = rom->size * 512;
struct rom_header *newrom = rom_reserve(romsize);
if (!newrom) {
warn_noalloc();
return NULL;
}
dprintf(4, "Copying option rom (size %d) from %p to %p\n"
, romsize, rom, newrom);
iomemcpy(newrom, rom, romsize);
return newrom;
}
// Map the option rom of a given PCI device.
static struct rom_header *
map_pcirom(struct pci_device *pci)
{
dprintf(6, "Attempting to map option rom on dev %pP\n", pci);
if ((pci->header_type & 0x7f) != PCI_HEADER_TYPE_NORMAL) {
dprintf(6, "Skipping non-normal pci device (type=%x)\n"
, pci->header_type);
return NULL;
}
u16 bdf = pci->bdf;
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 = (void*)orig;
for (;;) {
dprintf(5, "Inspecting possible rom at %p (vd=%04x:%04x bdf=%pP)\n"
, rom, pci->vendor, pci->device, pci);
if (rom->signature != OPTION_ROM_SIGNATURE) {
dprintf(6, "No option rom signature (got %x)\n", rom->signature);
goto fail;
}
struct pci_data *pd = get_pci_rom(rom);
if (! pd) {
dprintf(6, "No valid pci signature found\n");
goto fail;
}
if (pd->vendor == pci->vendor && pd->device == pci->device
&& pd->type == PCIROM_CODETYPE_X86)
// A match
break;
dprintf(6, "Didn't match dev/ven (got %04x:%04x) or type (got %d)\n"
, pd->vendor, pd->device, pd->type);
if (pd->indicator & 0x80) {
dprintf(6, "No more images left\n");
goto fail;
}
rom = (void*)((u32)rom + pd->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;
}
// Attempt to map and initialize the option rom on a given PCI device.
static void
init_pcirom(struct pci_device *pci, int isvga, u64 *sources)
{
dprintf(4, "Attempting to init PCI bdf %pP (vd %04x:%04x)\n"
, pci, pci->vendor, pci->device);
char fname[17];
snprintf(fname, sizeof(fname), "pci%04x,%04x.rom"
, pci->vendor, pci->device);
struct romfile_s *file = romfile_find(fname);
struct rom_header *rom = NULL;
if (file)
rom = deploy_romfile(file);
else if (RunPCIroms > 1 || (RunPCIroms == 1 && isvga))
rom = map_pcirom(pci);
if (! rom)
// No ROM present.
return;
setRomSource(sources, rom, RS_PCIROM | (u32)pci);
init_optionrom(rom, pci->bdf, isvga);
}
/****************************************************************
* Non-VGA option rom init
****************************************************************/
void
optionrom_setup(void)
{
if (! CONFIG_OPTIONROMS)
return;
dprintf(1, "Scan for option roms\n");
u64 sources[(BUILD_BIOS_ADDR - BUILD_ROM_START) / OPTION_ROM_ALIGN];
memset(sources, 0, sizeof(sources));
u32 post_vga = rom_get_last();
// Find and deploy PCI roms.
struct pci_device *pci;
foreachpci(pci) {
if (pci->class == PCI_CLASS_DISPLAY_VGA ||
pci->class == PCI_CLASS_DISPLAY_OTHER ||
pci->have_driver)
continue;
init_pcirom(pci, 0, sources);
}
// Find and deploy CBFS roms not associated with a device.
run_file_roms("genroms/", 0, sources);
rom_reserve(0);
// All option roms found and deployed - now build BEV/BCV vectors.
u32 pos = post_vga;
while (pos < rom_get_last()) {
struct rom_header *rom = (void*)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.
boot_add_bcv(FLATPTR_TO_SEG(rom), OPTION_ROM_INITVECTOR, 0
, getRomPriority(sources, rom, 0));
continue;
}
// PnP rom - check for BEV and BCV boot capabilities.
int instance = 0;
while (pnp) {
if (pnp->bev)
boot_add_bev(FLATPTR_TO_SEG(rom), pnp->bev, pnp->productname
, getRomPriority(sources, rom, instance++));
else if (pnp->bcv)
boot_add_bcv(FLATPTR_TO_SEG(rom), pnp->bcv, pnp->productname
, getRomPriority(sources, rom, instance++));
else
break;
pnp = get_pnp_next(rom, pnp);
}
}
}
/****************************************************************
* VGA init
****************************************************************/
int ScreenAndDebug;
struct rom_header *VgaROM;
static void try_setup_display_other(void)
{
struct pci_device *pci;
dprintf(1, "No VGA found, scan for other display\n");
foreachpci(pci) {
if (pci->class != PCI_CLASS_DISPLAY_OTHER)
continue;
struct rom_header *rom = map_pcirom(pci);
if (!rom)
continue;
dprintf(1, "Other display found at %pP\n", pci);
pci_config_maskw(pci->bdf, PCI_COMMAND, 0,
PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
init_optionrom(rom, pci->bdf, 1);
return;
}
}
// Call into vga code to turn on console.
void
vgarom_setup(void)
{
int have_vga = 0;
if (! CONFIG_OPTIONROMS)
return;
dprintf(1, "Scan for VGA option rom\n");
// Load some config settings that impact VGA.
EnforceChecksum = romfile_loadint("etc/optionroms-checksum", 1);
S3ResumeVga = romfile_loadint("etc/s3-resume-vga-init", CONFIG_QEMU);
RunPCIroms = romfile_loadint("etc/pci-optionrom-exec", 2);
ScreenAndDebug = romfile_loadint("etc/screen-and-debug", 1);
// Clear option rom memory
memset((void*)BUILD_ROM_START, 0, rom_get_max() - BUILD_ROM_START);
// Find and deploy PCI VGA rom.
struct pci_device *pci;
foreachpci(pci) {
if (!is_pci_vga(pci))
continue;
vgahook_setup(pci);
init_pcirom(pci, 1, NULL);
have_vga = 1;
break;
}
if (!have_vga)
try_setup_display_other();
// Find and deploy CBFS vga-style roms not associated with a device.
run_file_roms("vgaroms/", 1, NULL);
rom_reserve(0);
if (rom_get_last() != BUILD_ROM_START)
// VGA rom found
VgaROM = (void*)BUILD_ROM_START;
}
void
s3_resume_vga(void)
{
if (!S3ResumeVga)
return;
if (!VgaROM || ! is_valid_rom(VgaROM))
return;
callrom(VgaROM, 0);
}