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minor reformat 

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1567 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Li-Ta Lo 2004-05-24 17:35:52 +00:00
parent c8ccf8ac0a
commit 7b095aa1d9
1 changed files with 91 additions and 88 deletions
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179
src/pc80/vgabios.c
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@ -66,87 +66,88 @@
/* 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... */
/* 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"
/* Turn off protection (bit 0 in CR0) */
" movl %cr0, %eax \n"
" andl $0xFFFFFFFE, %eax \n"
" movl %eax, %cr0 \n"
/* Now really going into real mode */
" ljmp $0, $__rms_real \n"
"__rms_real: \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"
/* 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__ __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... */
/* 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"
/* Turn off protection (bit 0 in CR0) */
" movl %cr0, %eax \n"
" andl $0xFFFFFFFE, %eax \n"
" movl %eax, %cr0 \n"
/* Now really going into real mode */
" ljmp $0, $__rms_real \n"
"__rms_real: \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"
/* 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[];
@ -161,16 +162,18 @@ do_vgabios(void)
int i;
for (i=0x400; i<0x500; i++) {
printk_debug("%02x%c", *(unsigned char *)i, i%16==15 ? '\n' : ' ');
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' : ' ');
printk_debug("%02x%c", *(unsigned char *)i,
i%16==15 ? '\n' : ' ');
}
dev = pci_find_class(PCI_CLASS_DISPLAY_VGA <<8, NULL);
if (! dev) {
printk_debug("NO VGA FOUND\n");
return;
@ -360,7 +363,7 @@ biosint(
flags = stackflags;
printk_debug("biosint: # 0x%lx, eax 0x%lx ebx 0x%lx ecx 0x%lx edx 0x%lx\n",
intnumber, eax, ebx, ecx, edx);
intnumber, eax, ebx, ecx, edx);
printk_debug("biosint: ebp 0x%lx esp 0x%lx edi 0x%lx esi 0x%lx\n", ebp, esp, edi, esi);
printk_debug("biosint: ip 0x%x cs 0x%x flags 0x%x\n", ip, cs, flags);
// cases in a good compiler are just as good as your own tables.
@ -383,7 +386,7 @@ biosint(
case PCIBIOS:
ret = pcibios( &edi, &esi, &ebp, &esp,
&ebx, &edx, &ecx, &eax, &flags);
&ebx, &edx, &ecx, &eax, &flags);
break;
case MEMSIZE:
// who cares.
@ -392,7 +395,7 @@ biosint(
break;
default:
printk_info(__FUNCTION__ ": Unsupport int #0x%x\n",
intnumber);
intnumber);
break;
}
if (ret)