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seabios/src/optionroms.c

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// 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" // FARPTR_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 = FARPTR_TO_SEG(rom);
dprintf(1, "Running option rom at %x:%x\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();
}
// Verify that an option rom looks valid
static int
is_valid_rom(struct rom_header *rom)
{
if (rom->signature != OPTION_ROM_SIGNATURE)
return 0;
u32 len = rom->size * 512;
u8 sum = checksum((void*)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;
}
// Add a BEV vector for a given pnp compatible option rom.
static void
add_ipl(struct rom_header *rom, struct pnp_data *pnp)
{
// Found a device that thinks it can boot the system. Record
// its BEV and product name string.
if (! CONFIG_BOOT)
return;
if (IPL.count >= ARRAY_SIZE(IPL.table))
return;
struct ipl_entry_s *ip = &IPL.table[IPL.count];
ip->type = IPL_TYPE_BEV;
ip->vector = (FARPTR_TO_SEG(rom) << 16) | pnp->bev;
u16 desc = pnp->productname;
if (desc)
ip->description = MAKE_FARPTR(FARPTR_TO_SEG(rom), desc);
IPL.count++;
}
// 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 from %p to %x\n", rom, next_rom);
memcpy((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(u16 bdf)
{
if (OPTIONROM_BDF_1 && OPTIONROM_BDF_1 == bdf)
return copy_rom((struct rom_header *)OPTIONROM_MEM_1);
else if (OPTIONROM_BDF_2 && OPTIONROM_BDF_2 == bdf)
return copy_rom((struct rom_header *)OPTIONROM_MEM_2);
// XXX - check LAR when in coreboot?
return NULL;
}
// Map the option rom of a given PCI device.
static struct rom_header *
map_optionrom(u16 bdf)
{
dprintf(6, "Attempting to map option rom on dev %x\n", 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 < 16*1024*1024) {
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);
u32 vendev = pci_config_readl(bdf, PCI_VENDOR_ID);
struct rom_header *rom = (struct rom_header *)orig;
for (;;) {
dprintf(5, "Inspecting possible rom at %p (vd=%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 vendev (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;
}
// Attempt to map and initialize the option rom on a given PCI device.
static struct rom_header *
init_optionrom(u16 bdf)
{
dprintf(4, "Attempting to init PCI bdf %x\n", bdf);
struct rom_header *rom = lookup_hardcode(bdf);
if (! rom)
rom = map_optionrom(bdf);
if (! rom)
// No ROM present.
return NULL;
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;
}
/****************************************************************
* 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);
}
}
// 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 - run init vector now.
callrom(rom, OPTION_ROM_INITVECTOR, 0);
continue;
}
// PnP rom.
if (pnp->bev)
// Can boot system - add to IPL list.
add_ipl(rom, pnp);
else
// Check for BCV (there may be multiple).
while (pnp && pnp->bcv) {
// Has BCV - run it now.
callrom(rom, pnp->bcv, 0);
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");
}
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