blob: 83d068bcd6df05ad732a431f30aedf38bbc9f876 [file] [log] [blame]
* This file is part of the coreboot project.
* Copyright (C) 2007 Advanced Micro Devices, Inc.
* Copyright (C) 2009-2010 coresystems GmbH
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
#include <arch/io.h>
#include <arch/interrupt.h>
#include <arch/registers.h>
#include <boot/coreboot_tables.h>
#include <cbfs.h>
#include <console/console.h>
#include <cpu/amd/lxdef.h>
#include <cpu/amd/vr.h>
#include <delay.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <lib/jpeg.h>
#include <pc80/i8259.h>
#include <pc80/i8254.h>
#include <string.h>
#include <vbe.h>
/* we use x86emu's register file representation */
#include <x86emu/regs.h>
#include "x86.h"
/* The following symbols cannot be used directly. They need to be fixed up
* to point to the correct address location after the code has been copied
* to REALMODE_BASE. Absolute symbols are not used because those symbols are
* relocated when a relocatable ramstage is enabled.
extern unsigned char __realmode_call, __realmode_interrupt;
extern unsigned char __realmode_buffer;
#define PTR_TO_REAL_MODE(sym)\
(void *)(REALMODE_BASE + ((char *)&(sym) - (char *)&__realmode_code))
/* to have a common register file for interrupt handlers */
X86EMU_sysEnv _X86EMU_env;
void (*realmode_call)(u32 addr, u32 eax, u32 ebx, u32 ecx, u32 edx,
u32 esi, u32 edi) asmlinkage;
void (*realmode_interrupt)(u32 intno, u32 eax, u32 ebx, u32 ecx, u32 edx,
u32 esi, u32 edi) asmlinkage;
static void setup_realmode_code(void)
memcpy(REALMODE_BASE, &__realmode_code, __realmode_code_size);
/* Ensure the global pointers are relocated properly. */
realmode_call = PTR_TO_REAL_MODE(__realmode_call);
realmode_interrupt = PTR_TO_REAL_MODE(__realmode_interrupt);
printk(BIOS_SPEW, "Real mode stub @%p: %d bytes\n", REALMODE_BASE,
static void setup_rombios(void)
const char date[] = "06/11/99";
memcpy((void *)0xffff5, &date, 8);
const char ident[] = "PCI_ISA";
memcpy((void *)0xfffd9, &ident, 7);
/* system model: IBM-AT */
write8((void *)0xffffe, 0xfc);
static int (*intXX_handler[256])(void) = { NULL };
static int intXX_exception_handler(void)
/* compatibility shim */
struct eregs reg_info = {
.error_code=0, // FIXME: fill in
struct eregs *regs = &reg_info;
printk(BIOS_INFO, "Oops, exception %d while executing option rom\n",
x86_exception(regs); // Call coreboot exception handler
return 0; // Never really returns
static int intXX_unknown_handler(void)
printk(BIOS_INFO, "Unsupported software interrupt #0x%x eax 0x%x\n",
M.x86.intno, X86_EAX);
return -1;
/* setup interrupt handlers for mainboard */
void mainboard_interrupt_handlers(int intXX, int (*intXX_func)(void))
intXX_handler[intXX] = intXX_func;
static void setup_interrupt_handlers(void)
int i;
/* The first 16 intXX functions are not BIOS services,
* but the CPU-generated exceptions ("hardware interrupts")
for (i = 0; i < 0x10; i++)
intXX_handler[i] = &intXX_exception_handler;
/* Mark all other intXX calls as unknown first */
for (i = 0x10; i < 0x100; i++)
/* If the mainboard_interrupt_handler isn't called first.
/* Now set the default functions that are actually
* needed to initialize the option roms. This is
* very slick, as it allows us to implement mainboard
* specific interrupt handlers, such as the int15.
switch (i) {
case 0x10:
intXX_handler[0x10] = &int10_handler;
case 0x12:
intXX_handler[0x12] = &int12_handler;
case 0x16:
intXX_handler[0x16] = &int16_handler;
case 0x1a:
intXX_handler[0x1a] = &int1a_handler;
intXX_handler[i] = &intXX_unknown_handler;
static void write_idt_stub(void *target, u8 intnum)
unsigned char *codeptr;
codeptr = (unsigned char *) target;
memcpy(codeptr, &__idt_handler, __idt_handler_size);
codeptr[3] = intnum; /* modify int# in the code stub. */
static void setup_realmode_idt(void)
struct realmode_idt *idts = (struct realmode_idt *) 0;
int i;
/* Copy IDT stub code for each interrupt. This might seem wasteful
* but it is really simple
for (i = 0; i < 256; i++) {
idts[i].cs = 0;
idts[i].offset = 0x1000 + (i * __idt_handler_size);
write_idt_stub((void *)((uintptr_t)idts[i].offset), i);
/* Many option ROMs use the hard coded interrupt entry points in the
* system bios. So install them at the known locations.
/* int42 is the relocated int10 */
write_idt_stub((void *)0xff065, 0x42);
/* BIOS Int 11 Handler F000:F84D */
write_idt_stub((void *)0xff84d, 0x11);
/* BIOS Int 12 Handler F000:F841 */
write_idt_stub((void *)0xff841, 0x12);
/* BIOS Int 13 Handler F000:EC59 */
write_idt_stub((void *)0xfec59, 0x13);
/* BIOS Int 14 Handler F000:E739 */
write_idt_stub((void *)0xfe739, 0x14);
/* BIOS Int 15 Handler F000:F859 */
write_idt_stub((void *)0xff859, 0x15);
/* BIOS Int 16 Handler F000:E82E */
write_idt_stub((void *)0xfe82e, 0x16);
/* BIOS Int 17 Handler F000:EFD2 */
write_idt_stub((void *)0xfefd2, 0x17);
/* ROM BIOS Int 1A Handler F000:FE6E */
write_idt_stub((void *)0xffe6e, 0x1a);
vbe_mode_info_t mode_info;
static int mode_info_valid;
int vbe_mode_info_valid(void)
return mode_info_valid;
static u8 vbe_get_mode_info(vbe_mode_info_t * mi)
printk(BIOS_DEBUG, "VBE: Getting information about VESA mode %04x\n",
char *buffer = PTR_TO_REAL_MODE(__realmode_buffer);
u16 buffer_seg = (((unsigned long)buffer) >> 4) & 0xff00;
u16 buffer_adr = ((unsigned long)buffer) & 0xffff;
realmode_interrupt(0x10, VESA_GET_MODE_INFO, 0x0000,
mi->video_mode, 0x0000, buffer_seg, buffer_adr);
memcpy(mi->mode_info_block, buffer, sizeof(mi->mode_info_block));
mode_info_valid = 1;
return 0;
static u8 vbe_set_mode(vbe_mode_info_t * mi)
printk(BIOS_DEBUG, "VBE: Setting VESA mode %04x\n", mi->video_mode);
// request linear framebuffer mode
mi->video_mode |= (1 << 14);
// request clearing of framebuffer
mi->video_mode &= ~(1 << 15);
realmode_interrupt(0x10, VESA_SET_MODE, mi->video_mode,
0x0000, 0x0000, 0x0000, 0x0000);
return 0;
/* These two functions could probably even be generic between
* yabel and x86 native. TBD later.
void vbe_set_graphics(void)
mode_info.video_mode = (1 << 14) | CONFIG_FRAMEBUFFER_VESA_MODE;
unsigned char *framebuffer =
(unsigned char *)mode_info.vesa.phys_base_ptr;
printk(BIOS_DEBUG, "VBE: resolution: %dx%d@%d\n",
printk(BIOS_DEBUG, "VBE: framebuffer: %p\n", framebuffer);
if (!framebuffer) {
printk(BIOS_DEBUG, "VBE: Mode does not support linear "
struct jpeg_decdata *decdata;
unsigned char *jpeg = cbfs_boot_map_with_leak("bootsplash.jpg",
if (!jpeg) {
printk(BIOS_DEBUG, "VBE: No bootsplash found.\n");
decdata = malloc(sizeof(*decdata));
int ret = 0;
ret = jpeg_decode(jpeg, framebuffer, 1024, 768, 16, decdata);
void vbe_textmode_console(void)
realmode_interrupt(0x10, 0x0003, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000);
void fill_lb_framebuffer(struct lb_framebuffer *framebuffer)
framebuffer->physical_address = mode_info.vesa.phys_base_ptr;
framebuffer->x_resolution = le16_to_cpu(mode_info.vesa.x_resolution);
framebuffer->y_resolution = le16_to_cpu(mode_info.vesa.y_resolution);
framebuffer->bytes_per_line =
framebuffer->bits_per_pixel = mode_info.vesa.bits_per_pixel;
framebuffer->red_mask_pos = mode_info.vesa.red_mask_pos;
framebuffer->red_mask_size = mode_info.vesa.red_mask_size;
framebuffer->green_mask_pos = mode_info.vesa.green_mask_pos;
framebuffer->green_mask_size = mode_info.vesa.green_mask_size;
framebuffer->blue_mask_pos = mode_info.vesa.blue_mask_pos;
framebuffer->blue_mask_size = mode_info.vesa.blue_mask_size;
framebuffer->reserved_mask_pos = mode_info.vesa.reserved_mask_pos;
framebuffer->reserved_mask_size = mode_info.vesa.reserved_mask_size;
int vbe_mode_info_valid(void)
return 0;
void fill_lb_framebuffer(struct lb_framebuffer *framebuffer)
void run_bios(struct device *dev, unsigned long addr)
u32 num_dev = (dev->bus->secondary << 8) | dev->path.pci.devfn;
/* Setting up required hardware.
* Removing this will cause random illegal instruction exceptions
* in some option roms.
/* Set up some legacy information in the F segment */
/* Set up C interrupt handlers */
/* Set up real-mode IDT */
/* Make sure the code is placed. */
printk(BIOS_DEBUG, "Calling Option ROM...\n");
/* TODO ES:DI Pointer to System BIOS PnP Installation Check Structure */
/* Option ROM entry point is at OPROM start + 3 */
realmode_call(addr + 0x0003, num_dev, 0xffff, 0x0000, 0xffff, 0x0, 0x0);
printk(BIOS_DEBUG, "... Option ROM returned.\n");
if ((dev->class >> 8)== PCI_CLASS_DISPLAY_VGA)
#define VSA2_BUFFER 0x60000
#define VSA2_ENTRY_POINT 0x60020
// TODO move to a header file.
void do_vsmbios(void);
/* VSA virtual register helper */
static u32 VSA_vrRead(u16 classIndex)
u32 eax, ebx, ecx, edx;
asm volatile (
"movw $0x0AC1C, %%dx\n"
"orl $0x0FC530000, %%eax\n"
"outl %%eax, %%dx\n"
"addb $2, %%dl\n"
"inw %%dx, %%ax\n"
: "=a" (eax), "=b"(ebx), "=c"(ecx), "=d"(edx)
: "a"(classIndex)
return eax;
void do_vsmbios(void)
printk(BIOS_DEBUG, "Preparing for VSA...\n");
/* Set up C interrupt handlers */
/* Setting up realmode IDT */
/* Make sure the code is placed. */
if ((uintptr_t)cbfs_boot_load_stage_by_name("vsa") !=
printk(BIOS_ERR, "Failed to load VSA.\n");
unsigned char *buf = (unsigned char *)VSA2_BUFFER;
printk(BIOS_DEBUG, "VSA: Buffer @%p *[0k]=%02x\n", buf, buf[0]);
printk(BIOS_DEBUG, "VSA: Signature *[0x20-0x23] is %02x:%02x:%02x:%02x\n",
buf[0x20], buf[0x21], buf[0x22], buf[0x23]);
/* Check for code to emit POST code at start of VSA. */
if ((buf[0x20] != 0xb0) || (buf[0x21] != 0x10) ||
(buf[0x22] != 0xe6) || (buf[0x23] != 0x80)) {
printk(BIOS_WARNING, "VSA: Signature incorrect. Install failed.\n");
printk(BIOS_DEBUG, "Calling VSA module...\n");
/* ECX gets SMM, EDX gets SYSMEM */
realmode_call(VSA2_ENTRY_POINT, 0x0, 0x0, MSR_GLIU0_SMM,
MSR_GLIU0_SYSMEM, 0x0, 0x0);
printk(BIOS_DEBUG, "... VSA module returned.\n");
/* Restart timer 1 */
outb(0x56, 0x43);
outb(0x12, 0x41);
/* Check that VSA is running OK */
printk(BIOS_DEBUG, "VSM: VSA2 VR signature verified.\n");
printk(BIOS_ERR, "VSM: VSA2 VR signature not valid. Install failed.\n");
/* interrupt_handler() is called from assembler code only,
* so there is no use in putting the prototype into a header file.
int asmlinkage interrupt_handler(u32 intnumber,
u32 gsfs, u32 dses,
u32 edi, u32 esi,
u32 ebp, u32 esp,
u32 ebx, u32 edx,
u32 ecx, u32 eax,
u32 cs_ip, u16 stackflags);
int asmlinkage interrupt_handler(u32 intnumber,
u32 gsfs, u32 dses,
u32 edi, u32 esi,
u32 ebp, u32 esp,
u32 ebx, u32 edx,
u32 ecx, u32 eax,
u32 cs_ip, u16 stackflags)
u32 ip;
u32 cs;
u32 flags;
int ret = 0;
ip = cs_ip & 0xffff;
cs = cs_ip >> 16;
flags = stackflags;
printk(BIOS_DEBUG, "oprom: INT# 0x%x\n", intnumber);
printk(BIOS_DEBUG, "oprom: eax: %08x ebx: %08x ecx: %08x edx: %08x\n",
eax, ebx, ecx, edx);
printk(BIOS_DEBUG, "oprom: ebp: %08x esp: %08x edi: %08x esi: %08x\n",
ebp, esp, edi, esi);
printk(BIOS_DEBUG, "oprom: ip: %04x cs: %04x flags: %08x\n",
ip, cs, flags);
// Fetch arguments from the stack and put them to a place
// suitable for the interrupt handlers
X86_EAX = eax;
X86_ECX = ecx;
X86_EDX = edx;
X86_EBX = ebx;
X86_ESP = esp;
X86_EBP = ebp;
X86_ESI = esi;
X86_EDI = edi;
M.x86.intno = intnumber;
/* TODO: error_code must be stored somewhere */
X86_EIP = ip;
X86_CS = cs;
X86_EFLAGS = flags;
// Call the interrupt handler for this int#
ret = intXX_handler[intnumber]();
// Put registers back on the stack. The assembler code
// will later pop them.
// What happens here is that we force (volatile!) changing
// the values of the parameters of this function. We do this
// because we know that they stay alive on the stack after
// we leave this function. Don't say this is bollocks.
*(volatile u32 *)&eax = X86_EAX;
*(volatile u32 *)&ecx = X86_ECX;
*(volatile u32 *)&edx = X86_EDX;
*(volatile u32 *)&ebx = X86_EBX;
*(volatile u32 *)&esi = X86_ESI;
*(volatile u32 *)&edi = X86_EDI;
flags = X86_EFLAGS;
/* Pass success or error back to our caller via the CARRY flag */
if (ret) {
flags &= ~1; // no error: clear carry
printk(BIOS_DEBUG,"int%02x call returned error.\n", intnumber);
flags |= 1; // error: set carry
*(volatile u16 *)&stackflags = flags;
/* The assembler code doesn't actually care for the return value,
* but keep it around so its expectations are met */
return ret;