diff options
Diffstat (limited to 'contrib/syslinux/latest/core/timer.inc')
| -rw-r--r-- | contrib/syslinux/latest/core/timer.inc | 57 |
1 files changed, 0 insertions, 57 deletions
diff --git a/contrib/syslinux/latest/core/timer.inc b/contrib/syslinux/latest/core/timer.inc deleted file mode 100644 index b01ff91..0000000 --- a/contrib/syslinux/latest/core/timer.inc +++ /dev/null @@ -1,57 +0,0 @@ -;; ----------------------------------------------------------------------- -;; -;; 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. -;; -;; ----------------------------------------------------------------------- - -;; -;; timer.inc -;; -;; Very simple counting timer -;; -;; This lets us have a simple incrementing variable without worrying -;; about the BIOS_timer variable wrapping around at "midnight" and other -;; weird things. -;; -;; This also maintains a timer variable calibrated in milliseconds -;; (wraparound time = 49.7 days!) -;; - - section .text16 - -timer_init: - ; Hook INT 1Ch - mov eax,[BIOS_timer_hook] - mov [BIOS_timer_next],eax - mov dword [BIOS_timer_hook],timer_irq - ret - -timer_cleanup: - ; Unhook INT 1Ch - mov eax,[BIOS_timer_next] - mov [BIOS_timer_hook],eax - ret - -; -; The specified frequency is 14.31818 MHz/12/65536; this turns out -; to be a period of 54.92542 ms, or 0x36.ece8(187c) hexadecimal. -; -timer_irq: - inc dword [cs:__jiffies] - add word [cs:__ms_timer_adj],0xece8 - adc dword [cs:__ms_timer],0x36 - jmp 0:0 -BIOS_timer_next equ $-4 - - section .data16 - alignz 4 - global __jiffies, __ms_timer -__jiffies dd 0 ; Clock tick timer -__ms_timer dd 0 ; Millisecond timer -__ms_timer_adj dw 0 ; Millisecond timer correction factor |