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[prefix] Prompt for entering gPXE shell during POST

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The ROM prefix now prompts the user to enter the gPXE shell during POST;
this allows for configuring gPXE without needing to attempt to boot from
it.  (It also slows down system boot by three seconds per gPXE ROM, but
hey.)

This is apparently a certain OEM's requirement for option ROMs.
This commit is contained in:
Michael Brown 2008-05-22 15:14:33 +01:00
parent fd0aef9ee1
commit 7cd08434ea
1 changed files with 61 additions and 10 deletions
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71
src/arch/i386/prefix/romprefix.S
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@ -130,9 +130,12 @@ init:
pushaw
pushw %ds
pushw %es
pushw %fs
cld
pushw %cs
popw %ds
pushw $0x40
popw %fs
movw %di, %bx
xorw %di, %di
/* Print message as early as possible */
@ -227,11 +230,53 @@ gotpmm: /* PMM allocation succeeded: copy ROM to PMM block */
loop 1b
subb %bl, checksum
popal
no_pmm:
/* Print CRLF to terminate messages */
movw $'\n', %ax
call print_character
no_pmm: /* Prompt for POST-time shell */
movw $init_message_prompt, %si
call print_message
/* Empty the keyboard buffer before waiting for input */
empty_keyboard_buffer:
movb $0x01, %ah
int $0x16
jz 1f
xorw %ax, %ax
int $0x16
jmp empty_keyboard_buffer
1: /* Wait for up to 3s for a key press */
movw $(18 * 3), %cx /* Approx 3s worth of timer ticks */
wait_for_key:
decw %cx
jz no_key_pressed
/* Wait for timer tick to be updated */
movl %fs:(0x6c), %eax
1: pushf
sti
hlt
popf
cmpl %fs:(0x6c), %eax
je 1b
/* Check to see if a key was pressed */
movb $0x01, %ah
int $0x16
jz wait_for_key
/* Check to see if key was Ctrl-B */
cmpb $0x02, %al
je 1f
/* Key was not Ctrl-B: remove from buffer and stop waiting */
xorw %ax, %ax
int $0x16
jmp no_key_pressed
1: /* Key was Ctrl-B: leave in keyboard buffer and invoke gPXE.
* The keypress will be picked up by the initial shell
* prompt, and we will drop into a shell.
*/
pushw %cs
call exec
no_key_pressed:
/* Print blank lines to terminate messages */
movw $init_message_end, %si
call print_message
/* Restore registers */
popw %fs
popw %es
popw %ds
popaw
@ -245,19 +290,25 @@ init_message:
.size init_message, . - init_message
init_message_pnp:
.asciz " PnP"
.size init_message_pnp, . - init_message_pnp
.size init_message_pnp, . - init_message_pnp
init_message_bbs:
.asciz " BBS"
.size init_message_bbs, . - init_message_bbs
.size init_message_bbs, . - init_message_bbs
init_message_pmm:
.asciz " PMM"
.size init_message_pmm, . - init_message_pmm
.size init_message_pmm, . - init_message_pmm
init_message_pmm_failed:
.asciz "(failed)"
.size init_message_pmm_failed, . - init_message_pmm_failed
.size init_message_pmm_failed, . - init_message_pmm_failed
init_message_int19:
.asciz " INT19"
.size init_message_int19, . - init_message_int19
.size init_message_int19, . - init_message_int19
init_message_prompt:
.asciz "\nPress Ctrl-B to configure gPXE..."
.size init_message_prompt, . - init_message_prompt
init_message_end:
.asciz "\n\n\n"
.size init_message_end, . - init_message_end
/* ROM image location
*
@ -361,7 +412,7 @@ exec: /* Set %ds = %cs */
.previous
exec_message:
.asciz "gPXE starting boot\n"
.asciz "Entering gPXE\n"
.size exec_message, . - exec_message
/* UNDI loader