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x86: Set cold/warm boot flag

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This commit is contained in:
Graeme Russ 2010-10-07 20:03:30 +11:00
parent 161b3589ea
commit c81b26beb8
3 changed files with 13 additions and 16 deletions
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19
arch/i386/cpu/start.S
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@ -51,7 +51,7 @@ _i386boot_start:
wbinvd
/* Tell 32-bit code it is being entered from an in-RAM copy */
movw $0x0000, %bx
movw $GD_FLG_WARM_BOOT, %bx
_start:
/* This is the 32-bit cold-reset entry point */
@ -66,18 +66,10 @@ _start:
/* Clear the interupt vectors */
lidt blank_idt_ptr
/*
* Skip low-level board and memory initialization if not starting
* from cold-reset. This allows us to do a fail safe boot-strap
* into a new build of U-Boot from a known-good boot flash
*/
movw $0x0001, %ax
cmpw %ax, %bx
jne mem_init_ret
/* We call a few functions in the board support package
* since we have no stack yet we'll have to use %ebp
* to store the return address */
/* Skip low-level initialization if not starting from cold-reset */
movl %ebx, %ecx
andl $GD_FLG_COLD_BOOT, %ecx
jz skip_mem_init
/* Early platform init (setup gpio, etc ) */
jmp early_board_init
@ -89,6 +81,7 @@ early_board_init_ret:
.globl mem_init_ret
mem_init_ret:
skip_mem_init:
/* fetch memory size (into %eax) */
jmp get_mem_size
.globl get_mem_size_ret

7
arch/i386/cpu/start16.S
View file

@ -22,6 +22,7 @@
* MA 02111-1307 USA
*/
#include <asm/global_data.h>
#define BOOT_SEG 0xffff0000 /* linear segment of boot code */
#define a32 .byte 0x67;
@ -31,6 +32,9 @@
.code16
.globl start16
start16:
/* Set the Cold Boot / Hard Reset flag */
movl $GD_FLG_COLD_BOOT, %ebx
/*
* First we let the BSP do some early initialization
* this code have to map the flash to its final position
@ -57,9 +61,6 @@ o32 cs lgdt gdt_ptr
/* Flush the prefetch queue */
jmp ff
ff:
/* Tell 32-bit code it is being entered from hard-reset */
movw $0x0001, %bx
/* Finally jump to the 32bit initialization code */
movw $code32start, %ax
movw %ax, %bp

3
arch/i386/include/asm/global_data.h
View file

@ -82,6 +82,9 @@ extern gd_t *gd;
#define GD_FLG_LOGINIT 0x00020 /* Log Buffer has been initialized */
#define GD_FLG_DISABLE_CONSOLE 0x00040 /* Disable console (in & out) */
#define GD_FLG_ENV_READY 0x00080 /* Environment imported into hash table */
#define GD_FLG_COLD_BOOT 0x00100 /* Cold Boot */
#define GD_FLG_WARM_BOOT 0x00200 /* Warm Boot */
#define DECLARE_GLOBAL_DATA_PTR