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https://github.com/AsahiLinux/u-boot
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f4a6f0aed0
There are some bits which should be ignored when displaying the mode number. Make sure that they are not included in the mode that is displayed. Signed-off-by: Simon Glass <sjg@chromium.org>
350 lines
8.8 KiB
C
350 lines
8.8 KiB
C
/*
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* From Coreboot file device/oprom/realmode/x86.c
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*
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* Copyright (C) 2007 Advanced Micro Devices, Inc.
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* Copyright (C) 2009-2010 coresystems GmbH
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <common.h>
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#include <bios_emul.h>
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#include <vbe.h>
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#include <linux/linkage.h>
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#include <asm/cache.h>
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#include <asm/processor.h>
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#include <asm/i8259.h>
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#include <asm/io.h>
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#include <asm/post.h>
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#include "bios.h"
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/* Interrupt handlers for each interrupt the ROM can call */
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static int (*int_handler[256])(void);
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/* to have a common register file for interrupt handlers */
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X86EMU_sysEnv _X86EMU_env;
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asmlinkage void (*realmode_call)(u32 addr, u32 eax, u32 ebx, u32 ecx, u32 edx,
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u32 esi, u32 edi);
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asmlinkage void (*realmode_interrupt)(u32 intno, u32 eax, u32 ebx, u32 ecx,
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u32 edx, u32 esi, u32 edi);
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static void setup_realmode_code(void)
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{
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memcpy((void *)REALMODE_BASE, &asm_realmode_code,
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asm_realmode_code_size);
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/* Ensure the global pointers are relocated properly. */
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realmode_call = PTR_TO_REAL_MODE(asm_realmode_call);
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realmode_interrupt = PTR_TO_REAL_MODE(__realmode_interrupt);
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debug("Real mode stub @%x: %d bytes\n", REALMODE_BASE,
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asm_realmode_code_size);
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}
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static void setup_rombios(void)
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{
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const char date[] = "06/11/99";
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memcpy((void *)0xffff5, &date, 8);
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const char ident[] = "PCI_ISA";
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memcpy((void *)0xfffd9, &ident, 7);
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/* system model: IBM-AT */
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writeb(0xfc, 0xffffe);
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}
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static int int_exception_handler(void)
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{
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/* compatibility shim */
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struct eregs reg_info = {
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.eax = M.x86.R_EAX,
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.ecx = M.x86.R_ECX,
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.edx = M.x86.R_EDX,
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.ebx = M.x86.R_EBX,
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.esp = M.x86.R_ESP,
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.ebp = M.x86.R_EBP,
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.esi = M.x86.R_ESI,
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.edi = M.x86.R_EDI,
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.vector = M.x86.intno,
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.error_code = 0,
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.eip = M.x86.R_EIP,
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.cs = M.x86.R_CS,
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.eflags = M.x86.R_EFLG
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};
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struct eregs *regs = ®_info;
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debug("Oops, exception %d while executing option rom\n", regs->vector);
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cpu_hlt();
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return 0;
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}
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static int int_unknown_handler(void)
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{
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debug("Unsupported software interrupt #0x%x eax 0x%x\n",
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M.x86.intno, M.x86.R_EAX);
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return -1;
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}
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/* setup interrupt handlers for mainboard */
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void bios_set_interrupt_handler(int intnum, int (*int_func)(void))
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{
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int_handler[intnum] = int_func;
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}
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static void setup_interrupt_handlers(void)
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{
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int i;
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/*
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* The first 16 int_handler 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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int_handler[i] = &int_exception_handler;
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/* Mark all other int_handler calls as unknown first */
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for (i = 0x10; i < 0x100; i++) {
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/* Skip if bios_set_interrupt_handler() isn't called first */
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if (int_handler[i])
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continue;
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/*
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* Now set the default functions that are actually needed
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* to initialize the option roms. The board may override
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* these with bios_set_interrupt_handler()
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*/
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switch (i) {
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case 0x10:
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int_handler[0x10] = &int10_handler;
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break;
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case 0x12:
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int_handler[0x12] = &int12_handler;
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break;
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case 0x16:
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int_handler[0x16] = &int16_handler;
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break;
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case 0x1a:
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int_handler[0x1a] = &int1a_handler;
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break;
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default:
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int_handler[i] = &int_unknown_handler;
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break;
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}
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}
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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, __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 = NULL;
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int i;
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/*
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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 * __idt_handler_size);
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write_idt_stub((void *)((u32)idts[i].offset), i);
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}
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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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*/
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/* int42 is the relocated int10 */
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write_idt_stub((void *)0xff065, 0x42);
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/* BIOS Int 11 Handler F000:F84D */
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write_idt_stub((void *)0xff84d, 0x11);
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/* BIOS Int 12 Handler F000:F841 */
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write_idt_stub((void *)0xff841, 0x12);
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/* BIOS Int 13 Handler F000:EC59 */
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write_idt_stub((void *)0xfec59, 0x13);
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/* BIOS Int 14 Handler F000:E739 */
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write_idt_stub((void *)0xfe739, 0x14);
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/* BIOS Int 15 Handler F000:F859 */
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write_idt_stub((void *)0xff859, 0x15);
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/* BIOS Int 16 Handler F000:E82E */
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write_idt_stub((void *)0xfe82e, 0x16);
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/* BIOS Int 17 Handler F000:EFD2 */
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write_idt_stub((void *)0xfefd2, 0x17);
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/* ROM BIOS Int 1A Handler F000:FE6E */
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write_idt_stub((void *)0xffe6e, 0x1a);
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}
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static u8 vbe_get_mode_info(struct vbe_mode_info *mi)
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{
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u16 buffer_seg;
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u16 buffer_adr;
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char *buffer;
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debug("VBE: Getting information about VESA mode %04x\n",
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mi->video_mode);
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buffer = PTR_TO_REAL_MODE(asm_realmode_buffer);
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buffer_seg = (((unsigned long)buffer) >> 4) & 0xff00;
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buffer_adr = ((unsigned long)buffer) & 0xffff;
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realmode_interrupt(0x10, VESA_GET_MODE_INFO, 0x0000, mi->video_mode,
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0x0000, buffer_seg, buffer_adr);
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memcpy(mi->mode_info_block, buffer, sizeof(struct vbe_mode_info));
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mi->valid = true;
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return 0;
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}
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static u8 vbe_set_mode(struct vbe_mode_info *mi)
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{
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int video_mode = mi->video_mode;
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debug("VBE: Setting VESA mode %#04x\n", video_mode);
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/* request linear framebuffer mode */
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video_mode |= (1 << 14);
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/* don't clear the framebuffer, we do that later */
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video_mode |= (1 << 15);
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realmode_interrupt(0x10, VESA_SET_MODE, video_mode,
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0x0000, 0x0000, 0x0000, 0x0000);
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return 0;
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}
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static void vbe_set_graphics(int vesa_mode, struct vbe_mode_info *mode_info)
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{
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unsigned char *framebuffer;
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mode_info->video_mode = (1 << 14) | vesa_mode;
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vbe_get_mode_info(mode_info);
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framebuffer = (unsigned char *)mode_info->vesa.phys_base_ptr;
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debug("VBE: resolution: %dx%d@%d\n",
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le16_to_cpu(mode_info->vesa.x_resolution),
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le16_to_cpu(mode_info->vesa.y_resolution),
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mode_info->vesa.bits_per_pixel);
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debug("VBE: framebuffer: %p\n", framebuffer);
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if (!framebuffer) {
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debug("VBE: Mode does not support linear framebuffer\n");
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return;
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}
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mode_info->video_mode &= 0x3ff;
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vbe_set_mode(mode_info);
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}
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void bios_run_on_x86(pci_dev_t pcidev, unsigned long addr, int vesa_mode,
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struct vbe_mode_info *mode_info)
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{
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u32 num_dev;
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num_dev = PCI_BUS(pcidev) << 8 | PCI_DEV(pcidev) << 3 |
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PCI_FUNC(pcidev);
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/* Needed to avoid exceptions in some ROMs */
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interrupt_init();
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/* Set up some legacy information in the F segment */
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setup_rombios();
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/* Set up C interrupt handlers */
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setup_interrupt_handlers();
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/* Set up real-mode IDT */
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setup_realmode_idt();
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/* Make sure the code is placed. */
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setup_realmode_code();
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debug("Calling Option ROM at %lx, pci device %#x...", addr, num_dev);
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/* Option ROM entry point is at OPROM start + 3 */
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realmode_call(addr + 0x0003, num_dev, 0xffff, 0x0000, 0xffff, 0x0,
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0x0);
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debug("done\n");
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if (vesa_mode != -1)
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vbe_set_graphics(vesa_mode, mode_info);
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}
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asmlinkage int interrupt_handler(u32 intnumber, u32 gsfs, u32 dses,
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u32 edi, u32 esi, u32 ebp, u32 esp,
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u32 ebx, u32 edx, 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 = 0;
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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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#ifdef CONFIG_REALMODE_DEBUG
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debug("oprom: INT# 0x%x\n", intnumber);
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debug("oprom: eax: %08x ebx: %08x ecx: %08x edx: %08x\n",
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eax, ebx, ecx, edx);
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debug("oprom: ebp: %08x esp: %08x edi: %08x esi: %08x\n",
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ebp, esp, edi, esi);
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debug("oprom: ip: %04x cs: %04x flags: %08x\n",
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ip, cs, flags);
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debug("oprom: stackflags = %04x\n", stackflags);
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#endif
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/*
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* Fetch arguments from the stack and put them to a place
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* suitable for the interrupt handlers
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*/
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M.x86.R_EAX = eax;
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M.x86.R_ECX = ecx;
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M.x86.R_EDX = edx;
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M.x86.R_EBX = ebx;
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M.x86.R_ESP = esp;
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M.x86.R_EBP = ebp;
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M.x86.R_ESI = esi;
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M.x86.R_EDI = edi;
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M.x86.intno = intnumber;
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M.x86.R_EIP = ip;
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M.x86.R_CS = cs;
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M.x86.R_EFLG = flags;
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/* Call the interrupt handler for this interrupt number */
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ret = int_handler[intnumber]();
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/*
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* This code is quite strange...
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*
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* Put registers back on the stack. The assembler code will pop them
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* later. We force (volatile!) changing the values of the parameters
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* of this function. We know that they stay alive on the stack after
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* we leave this function.
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*/
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*(volatile u32 *)&eax = M.x86.R_EAX;
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*(volatile u32 *)&ecx = M.x86.R_ECX;
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*(volatile u32 *)&edx = M.x86.R_EDX;
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*(volatile u32 *)&ebx = M.x86.R_EBX;
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*(volatile u32 *)&esi = M.x86.R_ESI;
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*(volatile u32 *)&edi = M.x86.R_EDI;
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flags = M.x86.R_EFLG;
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/* Pass success or error back to our caller via the CARRY flag */
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if (ret) {
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flags &= ~1; /* no error: clear carry */
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} else {
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debug("int%02x call returned error\n", intnumber);
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flags |= 1; /* error: set 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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