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/*
* vmxloader.c: ROM/VMXAssist image loader.
*
* A quicky so that we can boot rom images as if they were a Linux kernel.
* This code will copy the rom images (ROMBIOS/VGABIOS/VM86) into their
* respective spaces and transfer control to VM86 to execute the BIOSes.
*
* Leendert van Doorn, leendert@watson.ibm.com
* Copyright (c) 2005, International Business Machines Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*/
#include "machine.h"
#include "roms.h"
#ifdef _ACPI_
#include "acpi.h"
#include "../acpi/acpi2_0.h" // for ACPI_PHYSICAL_ADDRESS
int acpi_madt_update(unsigned char* acpi_start);
#endif
/*
* C runtime start off
*/
asm(
" .text \n"
" .globl _start \n"
"_start: \n"
" cld \n"
" cli \n"
" lgdt gdt_desr \n"
" movl $stack_top, %esp \n"
" movl %esp, %ebp \n"
" call main \n"
" jmp halt \n"
" \n"
"gdt_desr: \n"
" .word gdt_end - gdt - 1 \n"
" .long gdt \n"
" \n"
" .align 8 \n"
"gdt: \n"
" .quad 0x0000000000000000 \n"
" .quad 0x00CF92000000FFFF \n"
" .quad 0x00CF9A000000FFFF \n"
"gdt_end: \n"
" \n"
"halt: \n"
" sti \n"
" jmp . \n"
" \n"
" .bss \n"
" .align 8 \n"
"stack: \n"
" .skip 0x4000 \n"
"stack_top: \n"
);
void *
memcpy(void *dest, const void *src, unsigned n)
{
int t0, t1, t2;
__asm__ __volatile__(
"cld\n"
"rep; movsl\n"
"testb $2,%b4\n"
"je 1f\n"
"movsw\n"
"1: testb $1,%b4\n"
"je 2f\n"
"movsb\n"
"2:"
: "=&c" (t0), "=&D" (t1), "=&S" (t2)
: "0" (n/4), "q" (n), "1" ((long) dest), "2" ((long) src)
: "memory"
);
return dest;
}
int
puts(const char *s)
{
while (*s)
outb(0xE9, *s++);
return 0;
}
int
cirrus_check(void)
{
outw(0x3C4, 0x9206);
return inb(0x3C5) == 0x12;
}
int
main(void)
{
puts("VMXAssist Loader\n");
puts("Loading ROMBIOS ...\n");
memcpy((void *)0xF0000, rombios, sizeof(rombios));
if (cirrus_check()) {
puts("Loading Cirrus VGABIOS ...\n");
memcpy((void *)0xC0000,
vgabios_cirrusvga, sizeof(vgabios_cirrusvga));
} else {
puts("Loading Standard VGABIOS ...\n");
memcpy((void *)0xC0000,
vgabios_stdvga, sizeof(vgabios_stdvga));
}
#ifdef _ACPI_
puts("Loading ACPI ...\n");
acpi_madt_update(acpi);
if (ACPI_PHYSICAL_ADDRESS+sizeof(acpi) <= 0xF0000) {
/* make sure acpi table does not overlap rombios
* currently acpi less than 8K will be OK.
*/
memcpy((void *)ACPI_PHYSICAL_ADDRESS, acpi, sizeof(acpi));
}
#endif
puts("Loading VMXAssist ...\n");
memcpy((void *)TEXTADDR, vmxassist, sizeof(vmxassist));
puts("Go ...\n");
((void (*)())TEXTADDR)();
return 0;
}
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