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/*
* (C) Copyright 2002
* Daniel Engström, Omicron Ceti AB, daniel@omicron.se
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
/*
* Partly based on msbios.c from rolo 1.6:
*----------------------------------------------------------------------
* (C) Copyright 2000
* Sysgo Real-Time Solutions GmbH
* Klein-Winternheim, Germany
*----------------------------------------------------------------------
*/
#include <common.h>
#include <pci.h>
#include <asm/realmode.h>
#include <asm/io.h>
DECLARE_GLOBAL_DATA_PTR;
#define NUMVECTS 256
#define BIOS_DATA ((char*)0x400)
#define BIOS_DATA_SIZE 256
#define BIOS_BASE ((char*)0xf0000)
#define BIOS_CS 0xf000
extern ulong __bios_start;
extern ulong __bios_size;
/* these are defined in a 16bit segment and needs
* to be accessed with the RELOC_16_xxxx() macros below
*/
extern u16 ram_in_64kb_chunks;
extern u16 bios_equipment;
extern u8 pci_last_bus;
extern void *rm_int00;
extern void *rm_int01;
extern void *rm_int02;
extern void *rm_int03;
extern void *rm_int04;
extern void *rm_int05;
extern void *rm_int06;
extern void *rm_int07;
extern void *rm_int08;
extern void *rm_int09;
extern void *rm_int0a;
extern void *rm_int0b;
extern void *rm_int0c;
extern void *rm_int0d;
extern void *rm_int0e;
extern void *rm_int0f;
extern void *rm_int10;
extern void *rm_int11;
extern void *rm_int12;
extern void *rm_int13;
extern void *rm_int14;
extern void *rm_int15;
extern void *rm_int16;
extern void *rm_int17;
extern void *rm_int18;
extern void *rm_int19;
extern void *rm_int1a;
extern void *rm_int1b;
extern void *rm_int1c;
extern void *rm_int1d;
extern void *rm_int1e;
extern void *rm_int1f;
extern void *rm_def_int;
extern void *realmode_reset;
extern void *realmode_pci_bios_call_entry;
static int set_jmp_vector(int entry_point, void *target)
{
if (entry_point & ~0xffff) {
return -1;
}
if (((u32)target-0xf0000) & ~0xffff) {
return -1;
}
printf("set_jmp_vector: 0xf000:%04x -> %p\n",
entry_point, target);
/* jmp opcode */
writeb(0xea, 0xf0000 + entry_point);
/* offset */
writew(((u32)target-0xf0000), 0xf0000 + entry_point + 1);
/* segment */
writew(0xf000, 0xf0000 + entry_point + 3);
return 0;
}
/*
************************************************************
* Install an interrupt vector
************************************************************
*/
static void setvector(int vector, u16 segment, void *handler)
{
u16 *ptr = (u16*)(vector*4);
ptr[0] = ((u32)handler - (segment << 4))&0xffff;
ptr[1] = segment;
#if 0
printf("setvector: int%02x -> %04x:%04x\n",
vector, ptr[1], ptr[0]);
#endif
}
#define RELOC_16_LONG(seg, off) *(u32*)(seg << 4 | (u32)&off)
#define RELOC_16_WORD(seg, off) *(u16*)(seg << 4 | (u32)&off)
#define RELOC_16_BYTE(seg, off) *(u8*)(seg << 4 | (u32)&off)
int bios_setup(void)
{
ulong bios_start = (ulong)&__bios_start + gd->reloc_off;
ulong bios_size = (ulong)&__bios_size;
static int done=0;
int vector;
#ifdef CONFIG_PCI
struct pci_controller *pri_hose;
#endif
if (done) {
return 0;
}
done = 1;
if (bios_size > 65536) {
printf("BIOS too large (%ld bytes, max is 65536)\n",
bios_size);
return -1;
}
memcpy(BIOS_BASE, (void*)bios_start, bios_size);
/* clear bda */
memset(BIOS_DATA, 0, BIOS_DATA_SIZE);
/* enter some values to the bda */
writew(0x3f8, BIOS_DATA); /* com1 addr */
writew(0x2f8, BIOS_DATA+2); /* com2 addr */
writew(0x3e8, BIOS_DATA+4); /* com3 addr */
writew(0x2e8, BIOS_DATA+6); /* com4 addr */
writew(0x278, BIOS_DATA+8); /* lpt1 addr */
/*
* The kernel wants to read the base memory size
* from 40:13. Put a zero there to avoid an error message
*/
writew(0, BIOS_DATA+0x13); /* base memory size */
/* setup realmode interrupt vectors */
for (vector = 0; vector < NUMVECTS; vector++) {
setvector(vector, BIOS_CS, &rm_def_int);
}
setvector(0x00, BIOS_CS, &rm_int00);
setvector(0x01, BIOS_CS, &rm_int01);
setvector(0x02, BIOS_CS, &rm_int02);
setvector(0x03, BIOS_CS, &rm_int03);
setvector(0x04, BIOS_CS, &rm_int04);
setvector(0x05, BIOS_CS, &rm_int05);
setvector(0x06, BIOS_CS, &rm_int06);
setvector(0x07, BIOS_CS, &rm_int07);
setvector(0x08, BIOS_CS, &rm_int08);
setvector(0x09, BIOS_CS, &rm_int09);
setvector(0x0a, BIOS_CS, &rm_int0a);
setvector(0x0b, BIOS_CS, &rm_int0b);
setvector(0x0c, BIOS_CS, &rm_int0c);
setvector(0x0d, BIOS_CS, &rm_int0d);
setvector(0x0e, BIOS_CS, &rm_int0e);
setvector(0x0f, BIOS_CS, &rm_int0f);
setvector(0x10, BIOS_CS, &rm_int10);
setvector(0x11, BIOS_CS, &rm_int11);
setvector(0x12, BIOS_CS, &rm_int12);
setvector(0x13, BIOS_CS, &rm_int13);
setvector(0x14, BIOS_CS, &rm_int14);
setvector(0x15, BIOS_CS, &rm_int15);
setvector(0x16, BIOS_CS, &rm_int16);
setvector(0x17, BIOS_CS, &rm_int17);
setvector(0x18, BIOS_CS, &rm_int18);
setvector(0x19, BIOS_CS, &rm_int19);
setvector(0x1a, BIOS_CS, &rm_int1a);
setvector(0x1b, BIOS_CS, &rm_int1b);
setvector(0x1c, BIOS_CS, &rm_int1c);
setvector(0x1d, BIOS_CS, &rm_int1d);
setvector(0x1e, BIOS_CS, &rm_int1e);
setvector(0x1f, BIOS_CS, &rm_int1f);
set_jmp_vector(0xfff0, &realmode_reset);
set_jmp_vector(0xfe6e, &realmode_pci_bios_call_entry);
/* fill in data area */
RELOC_16_WORD(0xf000, ram_in_64kb_chunks) = gd->ram_size >> 16;
RELOC_16_WORD(0xf000, bios_equipment) = 0; /* FixMe */
/* If we assume only one PCI hose, this PCI hose
* will own PCI bus #0, and the last PCI bus of
* that PCI hose will be the last PCI bus in the
* system.
* (This, ofcause break on multi hose systems,
* but our PCI BIOS only support one hose anyway)
*/
#ifdef CONFIG_PCI
pri_hose = pci_bus_to_hose(0);
if (NULL != pri_hose) {
/* fill in last pci bus number for use by the realmode
* PCI BIOS */
RELOC_16_BYTE(0xf000, pci_last_bus) = pri_hose->last_busno;
}
#endif
return 0;
}
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