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;; -*- fundamental -*- ---------------------------------------------------
;;
;; Copyright 2008 H. Peter Anvin - All Rights Reserved
;; Copyright 2009 Intel Corporation; author: H. Peter Anvin
;;
;; 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
;; the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
;; Boston MA 02110-1301, USA; either version 2 of the License, or
;; (at your option) any later version; incorporated herein by reference.
;;
;; -----------------------------------------------------------------------
section .text
TICKS_TO_IDLE equ 4
reset_idle:
push ax
mov ax,[cs:BIOS_timer]
mov [cs:IdleTimer],ax
pop ax
sti ; Guard against BIOS/PXE brokenness...
ret
do_idle:
push ax
push ds
push es
mov ax,cs
mov ds,ax
mov es,ax
pushf
pop ax
test ah,2
jnz .ok
push si
push cx
mov si,hlt_err
call writestr
mov si,sp
add si,10
mov cx,16
.errloop:
ss lodsw
call writehex4
dec cx
jz .endloop
mov al,' '
call writechr
jmp .errloop
.endloop:
call crlf
pop cx
pop si
sti
.ok:
mov ax,[BIOS_timer]
sub ax,[IdleTimer]
cmp ax,TICKS_TO_IDLE
jb .done
call [IdleHook]
cmp word [NoHalt],0
jne .done
hlt
.done:
pop es
pop ds
pop ax
.ret: ret
section .data
IdleHook dw do_idle.ret
NoHalt dw 1
hlt_err db 'ERROR: idle with IF=0', CR, LF, 0
section .bss
IdleTimer resw 1
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