See patch
Change real mode API to allow passing intXX number or entry point and
some register values from C.
This theoretically fixes non-vga option roms, but it also allows to use
the same assembler code for option roms and vsm.
It will also make using the bootsplash without yabel a lot easier.
Factor out and improve BDA setup, do some rom segment setup for those
option roms that need it.
Signed-off-by: Stefan Reinauer <ste...@coresystems.de>
Index: src/devices/oprom/x86.c
===================================================================
--- src/devices/oprom/x86.c (revision 5530)
+++ src/devices/oprom/x86.c (working copy)
@@ -36,11 +36,55 @@
extern unsigned char __idt_handler, __idt_handler_size;
extern unsigned char __realmode_code, __realmode_code_size;
-extern unsigned char __run_optionrom, __run_interrupt;
+extern unsigned char __realmode_call, __realmode_interrupt;
-void (*run_optionrom)(u32 devfn) __attribute__((regparm(0))) = (void
*)&__run_optionrom;
-void (*vga_enable_console)(void) __attribute__((regparm(0))) = (void
*)&__run_interrupt;
+void (*realmode_call)(u32 addr, u32 eax, u32 ebx, u32 ecx, u32 edx,
+ u32 esi, u32 edi) __attribute__((regparm(0))) = (void
*)&__realmode_call;
+void (*realmode_interrupt)(u32 intno, u32 eax, u32 ebx, u32 ecx, u32 edx,
+ u32 esi, u32 edi) __attribute__((regparm(0))) = (void
*)&__realmode_interrupt;
+
+void vga_enable_console(void);
+void vga_enable_console(void)
+{
+ /* Call VGA BIOS int10 function 0x4f14 to enable main console
+ * Epia-M does not always autosense the main console so forcing
+ * it on is good.
+ */
+
+ /* int#, EAX, EBX, ECX, EDX, ESI, EDI */
+ realmode_interrupt(0x10, 0x4f1f, 0x8003, 0x0001, 0x0000, 0x0000,
0x0000);
+}
+
+#define FAKE_MEMORY_SIZE (1024*1024) // only 1MB
+#define INITIAL_EBDA_SEGMENT 0xF600
+#define INITIAL_EBDA_SIZE 0x400
+
+static void setup_bda(void)
+{
+ /* clear BIOS DATA AREA */
+ memset((void *)0x400, 0, 0x200);
+
+ write16(0x413, FAKE_MEMORY_SIZE / 1024);
+ write16(0x40e, INITIAL_EBDA_SEGMENT);
+
+ /* Set up EBDA */
+ memset((void *)(INITIAL_EBDA_SEGMENT << 4), 0, INITIAL_EBDA_SIZE);
+ write16((INITIAL_EBDA_SEGMENT << 4) + 0x0, INITIAL_EBDA_SIZE / 1024);
+}
+
+static void setup_rombios(void)
+{
+ const char date[] = "06/11/99";
+ memcpy((void *)0xffff5, &date, 8);
+
+ const char ident[] = "PCI_ISA";
+ memcpy((void *)0xfffd9, &ident, 7);
+
+ /* system model: IBM-AT */
+ write8(0xffffe, 0xfc);
+}
+
int (*intXX_handler[256])(struct eregs *regs) = { NULL };
static int intXX_exception_handler(struct eregs *regs)
@@ -138,20 +182,38 @@
/* int42 is the relocated int10 */
write_idt_stub((void *)0xff065, 0x42);
-
- /* VIA's VBIOS calls f000:f859 instead of int15 */
+ /* BIOS Int 11 Handler F000:F84D */
+ write_idt_stub((void *)0xff84d, 0x11);
+ /* BIOS Int 12 Handler F000:F841 */
+ write_idt_stub((void *)0xff841, 0x12);
+ /* BIOS Int 13 Handler F000:EC59 */
+ write_idt_stub((void *)0xfec59, 0x13);
+ /* BIOS Int 14 Handler F000:E739 */
+ write_idt_stub((void *)0xfe739, 0x14);
+ /* BIOS Int 15 Handler F000:F859 */
write_idt_stub((void *)0xff859, 0x15);
+ /* BIOS Int 16 Handler F000:E82E */
+ write_idt_stub((void *)0xfe82e, 0x16);
+ /* BIOS Int 17 Handler F000:EFD2 */
+ write_idt_stub((void *)0xfefd2, 0x17);
+ /* ROM BIOS Int 1A Handler F000:FE6E */
+ write_idt_stub((void *)0xffe6e, 0x1a);
}
void run_bios(struct device *dev, unsigned long addr)
{
- /* clear vga bios data area */
- memset((void *)0x400, 0, 0x200);
+ u32 num_dev = (dev->bus->secondary << 8) | dev->path.pci.devfn;
+ /* Set up BIOS Data Area */
+ setup_bda();
+
+ /* Set up some legacy information in the F segment */
+ setup_rombios();
+
/* Set up C interrupt handlers */
setup_interrupt_handlers();
- /* Setting up realmode IDT */
+ /* Set up real-mode IDT */
setup_realmode_idt();
memcpy(REALMODE_BASE, &__realmode_code, (size_t)&__realmode_code_size);
@@ -159,7 +221,9 @@
(u32)&__realmode_code_size);
printk(BIOS_DEBUG, "Calling Option ROM...\n");
- run_optionrom((dev->bus->secondary << 8) | dev->path.pci.devfn);
+ /* TODO ES:DI Pointer to System BIOS PnP Installation Check Structure */
+ /* Option ROM entry point is at OPROM start + 3 */
+ realmode_call(addr + 0x0003, num_dev, 0xffff, 0x0000, 0xffff, 0x0, 0x0);
printk(BIOS_DEBUG, "... Option ROM returned.\n");
}
@@ -168,9 +232,6 @@
#include <cpu/amd/vr.h>
#include <cbfs.h>
-extern unsigned char __run_vsa;
-void (*run_vsa)(u32 smm, u32 sysmem) __attribute__((regparm(0))) = (void
*)&__run_vsa;
-
#define VSA2_BUFFER 0x60000
#define VSA2_ENTRY_POINT 0x60020
@@ -198,9 +259,6 @@
{
printk(BIOS_DEBUG, "Preparing for VSA...\n");
- /* clear bios data area */
- memset((void *)0x400, 0, 0x200);
-
/* Set up C interrupt handlers */
setup_interrupt_handlers();
@@ -229,8 +287,11 @@
}
printk(BIOS_DEBUG, "Calling VSA module...\n");
+
/* ECX gets SMM, EDX gets SYSMEM */
- run_vsa(MSR_GLIU0_SMM, MSR_GLIU0_SYSMEM);
+ realmode_call(VSA2_ENTRY_POINT, 0x0, 0x0, MSR_GLIU0_SMM,
+ MSR_GLIU0_SYSMEM, 0x0, 0x0);
+
printk(BIOS_DEBUG, "... VSA module returned.\n");
/* Restart timer 1 */
Index: src/devices/oprom/x86_asm.S
===================================================================
--- src/devices/oprom/x86_asm.S (revision 5530)
+++ src/devices/oprom/x86_asm.S (working copy)
@@ -1,7 +1,7 @@
/*
* This file is part of the coreboot project.
*
- * Copyright (C) 2009 coresystems GmbH
+ * Copyright (C) 2009-2010 coresystems GmbH
*
* 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
@@ -57,22 +57,51 @@
__stack = RELOCATED(.)
.long 0
+/* Register store for realmode_call and realmode_interrupt */
+__registers = RELOCATED(.)
+ .long 0 /* 0x00 - EAX */
+ .long 0 /* 0x04 - EBX */
+ .long 0 /* 0x08 - ECX */
+ .long 0 /* 0x0c - EDX */
+ .long 0 /* 0x10 - EDI */
+ .long 0 /* 0x14 - ESI */
+
.code32
- .globl __run_optionrom
-__run_optionrom = RELOCATED(.)
+ .globl __realmode_call
+__realmode_call = RELOCATED(.)
/* save all registers to the stack */
pushal
/* Move the protected mode stack to a safe place */
- mov %esp, __stack
+ movl %esp, __stack
/* Get devfn into %ecx */
movl %esp, %ebp
/* This function is called with regparm=0 and we have
* to skip the 32 byte from pushal:
*/
+
+ /* entry point */
movl 36(%ebp), %ecx
+ movw %cx, __lcall_instr + 1
+ andl $0xffff0000, %ecx
+ shrl $4, %ecx
+ movw %cx, __lcall_instr + 3
+
+ movl 40(%ebp), %eax
+ movl %eax, __registers + 0x00 /* eax */
+ movl 44(%ebp), %eax
+ movl %eax, __registers + 0x04 /* ebx */
+ movl 48(%ebp), %eax
+ movl %eax, __registers + 0x08 /* ecx */
+ movl 52(%ebp), %eax
+ movl %eax, __registers + 0x0c /* edx */
+ movl 56(%ebp), %eax
+ movl %eax, __registers + 0x10 /* esi */
+ movl 60(%ebp), %eax
+ movl %eax, __registers + 0x14 /* esi */
+
/* Activate the right segment descriptor real mode. */
ljmp $0x28, $RELOCATED(1f)
1:
@@ -120,11 +149,19 @@
mov $0x40, %ax
mov %ax, %ds
+ /* initialize registers for intXX call */
+ movl __registers, %ebp
+ movl 0(%ebp), %eax
+ movl 4(%ebp), %ebx
+ movl 8(%ebp), %ecx
+ movl 12(%ebp), %edx
+ movl 16(%ebp), %esi
+ movl 20(%ebp), %edi
+
/* ************************************ */
- mov %cx, %ax // restore ax
- // TODO this will not work for non-VGA option ROMs
- /* run VGA BIOS at 0xc000:0003 */
- lcall $0xc000, $0x0003
+__lcall_instr = RELOCATED(.)
+ .byte 0x9a
+ .word 0x0000, 0x0000
/* ************************************ */
/* If we got here, just about done.
@@ -151,117 +188,38 @@
lidt idtarg
/* and exit */
- mov __stack, %esp
+ movl __stack, %esp
popal
+
+ // TODO return AX from OPROM call
ret
-#if defined(CONFIG_GEODE_VSA) && CONFIG_GEODE_VSA
-#define VSA2_ENTRY_POINT 0x60020
+ .globl __realmode_interrupt
+__realmode_interrupt = RELOCATED(.)
- .globl __run_vsa
-__run_vsa = RELOCATED(.)
- /* save all registers to the stack */
pushal
-
- /* Move the protected mode stack to a safe place */
- mov %esp, __stack
-
+ /* save the stack */
+ movl %esp, __stack
movl %esp, %ebp
+
/* This function is called with regparm=0 and we have
* to skip the 32 byte from pushal:
*/
- movl 36(%ebp), %ecx
- movl 40(%ebp), %edx
+ movl 36(%ebp), %eax
+ movb %al, __intXX_instr + 1 /* intno */
+ movl 40(%ebp), %eax
+ movl %eax, __registers + 0x00 /* eax */
+ movl 44(%ebp), %eax
+ movl %eax, __registers + 0x04 /* ebx */
+ movl 48(%ebp), %eax
+ movl %eax, __registers + 0x08 /* ecx */
+ movl 52(%ebp), %eax
+ movl %eax, __registers + 0x0c /* edx */
+ movl 56(%ebp), %eax
+ movl %eax, __registers + 0x10 /* esi */
+ movl 60(%ebp), %eax
+ movl %eax, __registers + 0x14 /* esi */
- /* Activate the right segment descriptor real mode. */
- ljmp $0x28, $RELOCATED(1f)
-1:
-.code16
- /* 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
- mov %ax, %ds
- mov %ax, %es
- mov %ax, %fs
- mov %ax, %gs
- mov %ax, %ss
-
- /* Turn off protection */
- movl %cr0, %eax
- andl $~PE, %eax
- movl %eax, %cr0
-
- /* Now really going into real mode */
- ljmp $0, $RELOCATED(1f)
-1:
- /* Setup a stack: 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. */
- mov $0x0, %ax
- mov %ax, %ss
- movl $0x1000, %eax
- movl %eax, %esp
-
- /* Load our 16 bit idt */
- xor %ax, %ax
- mov %ax, %ds
- lidt __realmode_idt
-
- /* Set all segments to 0x0000, ds to 0x0040 */
- mov %ax, %es
- mov %ax, %fs
- mov %ax, %gs
- mov $0x40, %ax
- mov %ax, %ds
- mov %cx, %ax // restore ax
-
- /* ************************************ */
- lcall $((VSA2_ENTRY_POINT & 0xffff0000) >> 4), $(VSA2_ENTRY_POINT &
0xffff)
- /* ************************************ */
-
- /* If we got here, just about done.
- * Need to get back to protected mode
- */
- movl %cr0, %eax
- orl $PE, %eax
- movl %eax, %cr0
-
- /* Now that we are in protected mode
- * jump to a 32 bit code segment.
- */
- data32 ljmp $0x10, $RELOCATED(1f)
-1:
- .code32
- movw $0x18, %ax
- mov %ax, %ds
- mov %ax, %es
- mov %ax, %fs
- mov %ax, %gs
- mov %ax, %ss
-
- /* restore proper idt */
- lidt idtarg
-
- /* and exit */
- mov __stack, %esp
- popal
- ret
-#endif
-
- .globl __run_interrupt
-__run_interrupt = RELOCATED(.)
-
- pushal
- /* save the stack */
- mov %esp, __stack
-
-
/* This configures CS properly for real mode. */
ljmp $0x28, $RELOCATED(1f)
1:
@@ -312,18 +270,17 @@
mov %ax, %fs
mov %ax, %gs
- /* Call VGA BIOS int10 function 0x4f14 to enable main console
- * Epia-M does not always autosence the main console so forcing
- * it on is good.
- */
+ /* initialize registers for intXX call */
+ movl __registers, %ebp
+ movl 0(%ebp), %eax
+ movl 4(%ebp), %ebx
+ movl 8(%ebp), %ecx
+ movl 12(%ebp), %edx
+ movl 16(%ebp), %esi
+ movl 20(%ebp), %edi
- /* Ask VGA option rom to enable main console */
- movw $0x4f14,%ax
- movw $0x8003,%bx
- movw $1, %cx
- movw $0, %dx
- movw $0, %di
- int $0x10
+__intXX_instr = RELOCATED(.)
+ .byte 0xcd, 0x00 /* This becomes intXX */
/* Ok, the job is done, now go back to protected mode coreboot */
movl %cr0, %eax
@@ -345,7 +302,7 @@
lidt idtarg
/* Exit */
- mov __stack, %esp
+ movl __stack, %esp
popal
ret
--
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