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latest greatest vga support

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This commit is contained in:
Ronald G. Minnich 2003-09-24 16:51:08 +00:00
parent 4401103644
commit ee9d9e75ac
2 changed files with 110 additions and 98 deletions
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17
src/arch/i386/lib/idt.c
View file

@ -176,7 +176,7 @@ biosint(
printk_debug("\n");
}
printk_debug("biosint: Bailing out\n");
// "longjmp"
// Should be replaced by longjmp for generalization.
vga_exit();
break;
#ifdef CONFIG_PCIBIOS
@ -230,14 +230,23 @@ setup_realmode_idt(void) {
*intbyte = i;
}
// fixed entry points
// Support for fixed entry points
// VGA BIOSes tend to hardcode f000:f065 as the previous handler of
// int10.
// First off, fill 0xCC (breakpoint) from f000:e000 to f000:ffff
// so we can catch the calls to unimplemented entry points.
// This 8KB area is where the fixed entry points are at.
// Maybe the original IBM PC had only this much of ROM.
memset((void *) 0xfe000, 0xCC, 0x2000);
// VGA BIOSes tend to hardcode f000:f065 as the default handler for
// int10.
// calling convention here is the same as INTs, we can reuse
// the int entry code.
codeptr = (char*) 0xff065;
memcpy(codeptr, &idthandle, codesize);
intbyte = codeptr + 3;
*intbyte = 0x42; /* int42 is the relocated int10 */
// Clear the BIOS Data Area, not to confuse the realmode code.
memset((void *) 0x400, 0, 0x100);
}

191
src/arch/i386/lib/vgabios.c
View file

@ -68,92 +68,96 @@ static char rcsid[] = "$Id$";
#if (CONFIG_VGABIOS == 1)
/* The address arguments to this function are PHYSICAL ADDRESSES */
static void real_mode_switch_call_vga(unsigned long devfn)
{
__asm__ __volatile__
(
// paranoia -- does ecx get saved? not sure. This is
// the easiest safe thing to do.
"pushal\n"
/* save the stack */
"mov %esp, __stack\n"
"jmp 1f\n"
"__stack: .long 0\n"
"1:\n"
/* get devfn into %ecx */
"movl %esp, %ebp\n"
"movl 8(%ebp), %ecx\n"
/* This configures CS properly for real mode. */
" ljmp $0x28, $__rms_16bit\n"
"__rms_16bit: \n"
".code16 \n" /* 16 bit code from here on... */
extern void real_mode_switch_call_vga(unsigned long busdevfn);
/* Load the segment registers w/ properly configured segment
* descriptors. They will retain these configurations (limits,
* writability, etc.) once protected mode is turned off. */
" mov $0x30, %ax \n"
" mov %ax, %ds \n"
" mov %ax, %es \n"
" mov %ax, %fs \n"
" mov %ax, %gs \n"
" mov %ax, %ss \n"
__asm__ (
".text\n"
"__stack:\n"
" .long 0\n"
"real_mode_switch_call_vga:\n"
" pushl %ebp\n"
" movl %esp, %ebp\n"
/* Save callee-saved registers, since we don't know what VGABIOS would break */
" pushl %ebx\n"
" pushl %esi\n"
" pushl %edi\n"
/* Get busdevfn in %ecx */
" movl 8(%ebp), %ecx\n"
/* Save the stack */
" mov %esp, __stack\n"
/* This configures CS properly for real mode. */
" ljmp $0x28, $1f\n"
"1:\n"
".code16\n" /* 16 bit code from here on... */
/* Turn off protection (bit 0 in CR0) */
" movl %cr0, %eax \n"
" andl $0xFFFFFFFE, %eax \n"
" movl %eax, %cr0 \n"
/* Load the segment registers w/ properly configured segment
* descriptors. They will retain these configurations (limits,
* writability, etc.) once protected mode is turned off. */
" movw $0x30, %ax\n"
" movw %ax, %ds\n"
" movw %ax, %es\n"
" movw %ax, %fs\n"
" movw %ax, %gs\n"
" movw %ax, %ss\n"
/* Now really going into real mode */
" ljmp $0, $__rms_real \n"
"__rms_real: \n"
/* Turn off protection (bit 0 in CR0) */
" movl %cr0, %eax\n"
" andl $0xFFFFFFFE, %eax\n"
" movl %eax, %cr0\n"
// put the stack at the end of page zero.
// that way we can easily share it between real and protected,
// since the 16-bit ESP at segment 0 will work for any case.
/* Setup a stack */
" mov $0x0, %ax \n"
" mov %ax, %ss \n"
" movl $0x1000, %eax \n"
" movl %eax, %esp \n"
/* debugging for RGM */
" mov $0x11, %al \n"
" outb %al, $0x80\n"
/* Now really going into real mode */
" ljmp $0, $1f\n"
"1:\n"
/* Dump zeros in the other segregs */
" xor %ax, %ax \n"
" mov %ax, %ds \n"
" mov %ax, %es \n"
" mov %ax, %fs \n"
" mov %ax, %gs \n"
" mov %cx, %ax \n"
" .byte 0x9a, 0x03, 0, 0, 0xc0 \n"
" movb $0x55, %al\noutb %al, $0x80\n"
/* if we got here, just about done.
* Need to get back to protected mode */
"movl %cr0, %eax\n"
// "andl $0x7FFAFFD1, %eax\n" /* PG,AM,WP,NE,TS,EM,MP = 0 */
// "orl $0x60000001, %eax\n" /* CD, NW, PE = 1 */
"orl $0x0000001, %eax\n" /* PE = 1 */
"movl %eax, %cr0\n"
/* Now that we are in protected mode jump to a 32 bit code segment. */
"data32 ljmp $0x10, $vgarestart\n"
"vgarestart:\n"
".code32\n"
" movw $0x18, %ax \n"
" mov %ax, %ds \n"
" mov %ax, %es \n"
" mov %ax, %fs \n"
" mov %ax, %gs \n"
" mov %ax, %ss \n"
".globl vga_exit\n"
"vga_exit:\n"
" mov __stack, %esp\n"
" popal\n"
);
}
__asm__ (".text\n""real_mode_switch_end:\n");
extern char real_mode_switch_end[];
// put the stack at the end of page zero.
// that way we can easily share it between real and protected,
// since the 16-bit ESP at segment 0 will work for any case.
/* Setup a stack */
" xorw %ax, %ax\n"
" movw %ax, %ss\n"
" movl $0x1000, %esp\n"
/* debugging for RGM */
" movb $0x11, %al\n"
" outb %al, $0x80\n"
/* Dump zeros in the other segregs */
" xorw %ax, %ax\n"
" movw %ax, %ds\n"
" movw %ax, %es\n"
" movw %ax, %fs\n"
" movw %ax, %gs\n"
/* Set bus/devfn to %ax */
" movw %cx, %ax\n"
/* Now do the deed */
" lcallw $0xc000, $0x0003\n"
/* debugging for RGM */
" movb $0x55, %al\n"
" outb %al, $0x80\n"
/* if we got here, just about done.
* Need to get back to protected mode */
" movl %cr0, %eax\n"
" orl $0x0000001, %eax\n" /* PE = 1 */
" movl %eax, %cr0\n"
/* Now that we are in protected mode jump to a 32 bit code segment. */
" ljmpl $0x10, $1f\n"
"1:\n"
".code32\n"
" movw $0x18, %ax\n"
" movw %ax, %ds\n"
" movw %ax, %es\n"
" movw %ax, %fs\n"
" movw %ax, %gs\n"
" movw %ax, %ss\n"
/* Emergency exit */
".globl vga_exit\n"
"vga_exit:\n"
" movl __stack, %esp\n"
" popl %edi\n"
" popl %esi\n"
" popl %ebx\n"
" popl %ebp\n"
" ret\n"
);
void
do_vgabios(void)
@ -165,15 +169,6 @@ do_vgabios(void)
unsigned int size = 64*1024;
int i;
for (i=0x400; i<0x500; i++) {
printk_debug("%02x%c", *(unsigned char *)i, i%16==15 ? '\n' : ' ');
*(unsigned char *) i = 0;
}
for (i=0x400; i<0x500; i++) {
printk_debug("%02x%c", *(unsigned char *)i, i%16==15 ? '\n' : ' ');
}
dev = pci_find_class(PCI_CLASS_DISPLAY_VGA <<8, NULL);
if (! dev) {
@ -192,15 +187,23 @@ for (i=0x400; i<0x500; i++) {
pci_write_config_dword(dev, PCI_ROM_ADDRESS, rom|1);
printk_debug("rom base, size: %x\n", rom);
#endif
buf = (unsigned char *) rom;
if ((buf[0] == 0x55) && (buf[1] = 0xaa)) {
if ((buf[0] == 0x55) && (buf[1] == 0xaa)) {
memcpy((void *) 0xc0000, buf, size);
for(i = 0; i < 16; i++)
printk_debug("0x%x ", buf[i]);
// check signature here later!
busdevfn = (dev->bus->secondary << 8) | dev->devfn;
real_mode_switch_call_vga(busdevfn);
// check signature again
buf = (unsigned char *) 0xc0000;
if (buf[0]==0x55 && buf[1]==0xAA) {
busdevfn = (dev->bus->secondary << 8) | dev->devfn;
printk_debug("bus/devfn = %#x\n", busdevfn);
real_mode_switch_call_vga(busdevfn);
} else
printk_debug("Failed to copy VGA BIOS to 0xc0000\n");
} else
printk_debug("BAD SIGNATURE 0x%x 0x%x\n", buf[0], buf[1]);
#ifndef VGABIOS_START