220 lines
6.0 KiB
C
220 lines
6.0 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2009 coresystems GmbH
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <device/pci.h>
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#include <string.h>
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#ifdef CONFIG_COREBOOT_V2
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#include <arch/io.h>
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#include <arch/registers.h>
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#include <console/console.h>
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#define printk(x...) do_printk(x)
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#else
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#include <console.h>
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#endif
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#define REALMODE_BASE ((void *)0x600)
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struct realmode_idt {
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u16 offset, cs;
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};
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void x86_exception(struct eregs *info);
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void run_bios(struct device *dev, unsigned long addr);
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extern unsigned char __idt_handler, __idt_handler_size;
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extern unsigned char __realmode_code, __realmode_code_size;
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extern unsigned char __run_optionrom, __run_interrupt;
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void (*run_optionrom)(u32 devfn) __attribute__((regparm(0))) = (void *)&__run_optionrom;
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void (*vga_enable_console)(void) __attribute__((regparm(0))) = (void *)&__run_interrupt;
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int (*intXX_handler[256])(struct eregs *regs) = { NULL };
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static int intXX_exception_handler(struct eregs *regs)
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{
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printk(BIOS_INFO, "Oops, exception %d while executing option rom\n",
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regs->vector);
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x86_exception(regs); // Call coreboot exception handler
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return 0; // Never returns?
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}
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static int intXX_unknown_handler(struct eregs *regs)
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{
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printk(BIOS_INFO, "Unsupported software interrupt #0x%x\n",
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regs->vector);
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return -1;
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}
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int int12_handler(struct eregs *regs);
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int int15_handler(struct eregs *regs);
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int int1a_handler(struct eregs *regs);
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static void setup_interrupt_handlers(void)
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{
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int i;
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/* The first 16 intXX functions are not BIOS services,
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* but the CPU-generated exceptions ("hardware interrupts")
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*/
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for (i = 0; i < 0x10; i++)
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intXX_handler[i] = &intXX_exception_handler;
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/* Mark all other intXX calls as unknown first */
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for (i = 0x10; i < 0x100; i++)
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intXX_handler[i] = &intXX_unknown_handler;
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/* Now set the default functions that are actually
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* needed to initialize the option roms. This is very
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* slick, as it allows us to implement mainboard specific
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* interrupt handlers, such as the int15
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*/
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intXX_handler[0x12] = &int12_handler;
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intXX_handler[0x15] = &int15_handler;
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intXX_handler[0x1a] = &int1a_handler;
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}
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static void write_idt_stub(void *target, u8 intnum)
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{
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unsigned char *codeptr;
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codeptr = (unsigned char *) target;
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memcpy(codeptr, &__idt_handler, (size_t)&__idt_handler_size);
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codeptr[3] = intnum; /* modify int# in the code stub. */
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}
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static void setup_realmode_idt(void)
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{
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struct realmode_idt *idts = (struct realmode_idt *) 0;
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int i;
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/* Copy IDT stub code for each interrupt. This might seem wasteful
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* but it is really simple
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*/
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for (i = 0; i < 256; i++) {
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idts[i].cs = 0;
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idts[i].offset = 0x1000 + (i * (u32)&__idt_handler_size);
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write_idt_stub((void *)((u32 )idts[i].offset), i);
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}
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/* Many option ROMs use the hard coded interrupt entry points in the
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* system bios. So install them at the known locations.
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* Only need int10 so far.
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*/
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/* int42 is the relocated int10 */
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write_idt_stub((void *)0xff065, 0x42);
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}
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void run_bios(struct device *dev, unsigned long addr)
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{
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/* clear vga bios data area */
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memset(0x400, 0, 0x200);
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/* Set up C interrupt handlers */
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setup_interrupt_handlers();
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/* Setting up realmode IDT */
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setup_realmode_idt();
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memcpy(REALMODE_BASE, &__realmode_code, (size_t)&__realmode_code_size);
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printk(BIOS_SPEW, "Real mode stub @%p: %d bytes\n", REALMODE_BASE,
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(u32)&__realmode_code_size);
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printk(BIOS_DEBUG, "Calling Option ROM...\n");
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run_optionrom((dev->bus->secondary << 8) | dev->path.pci.devfn);
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printk(BIOS_DEBUG, "... Option ROM returned.\n");
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}
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int __attribute__((regparm(0))) interrupt_handler(u32 intnumber,
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u32 gsfs, u32 dses,
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u32 edi, u32 esi,
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u32 ebp, u32 esp,
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u32 ebx, u32 edx,
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u32 ecx, u32 eax,
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u32 cs_ip, u16 stackflags)
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{
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u32 ip;
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u32 cs;
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u32 flags;
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int ret = -1;
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struct eregs reg_info;
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ip = cs_ip & 0xffff;
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cs = cs_ip >> 16;
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flags = stackflags;
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printk(BIOS_DEBUG, "oprom: INT# 0x%x\n", intnumber);
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printk(BIOS_DEBUG, "oprom: eax: %08x ebx: %08x ecx: %08x edx: %08x\n",
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eax, ebx, ecx, edx);
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printk(BIOS_DEBUG, "oprom: ebp: %08x esp: %08x edi: %08x esi: %08x\n",
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ebp, esp, edi, esi);
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printk(BIOS_DEBUG, "oprom: ip: %04x cs: %04x flags: %08x\n",
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ip, cs, flags);
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// Fetch arguments from the stack and put them into
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// a structure that we want to pass on to our sub interrupt
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// handlers.
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reg_info = (struct eregs) {
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.eax=eax,
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.ecx=ecx,
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.edx=edx,
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.ebx=ebx,
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.esp=esp,
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.ebp=ebp,
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.esi=esi,
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.edi=edi,
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.vector=intnumber,
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.error_code=0, // ??
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.eip=ip,
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.cs=cs,
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.eflags=flags // ??
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};
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// Call the interrupt handler for this int#
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ret = intXX_handler[intnumber](®_info);
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// Put registers back on the stack. The assembler code
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// will later pop them.
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// What happens here is that we force (volatile!) changing
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// the values of the parameters of this function. We do this
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// because we know that they stay alive on the stack after
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// we leave this function. Don't say this is bollocks.
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*(volatile u32 *)&eax = reg_info.eax;
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*(volatile u32 *)&ecx = reg_info.ecx;
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*(volatile u32 *)&edx = reg_info.edx;
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*(volatile u32 *)&ebx = reg_info.ebx;
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*(volatile u32 *)&esi = reg_info.esi;
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*(volatile u32 *)&edi = reg_info.edi;
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flags = reg_info.eflags;
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/* Pass errors back to our caller via the CARRY flag */
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if (ret) {
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printk(BIOS_DEBUG,"error!\n");
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flags |= 1; // error: set carry
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}else{
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flags &= ~1; // no error: clear carry
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}
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*(volatile u16 *)&stackflags = flags;
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return ret;
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}
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