diff options
Diffstat (limited to 'contrib/syslinux/syslinux-4.03/core/serirq.inc')
| -rw-r--r-- | contrib/syslinux/syslinux-4.03/core/serirq.inc | 219 |
1 files changed, 0 insertions, 219 deletions
diff --git a/contrib/syslinux/syslinux-4.03/core/serirq.inc b/contrib/syslinux/syslinux-4.03/core/serirq.inc deleted file mode 100644 index 47ccd50..0000000 --- a/contrib/syslinux/syslinux-4.03/core/serirq.inc +++ /dev/null @@ -1,219 +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., 53 Temple Place Ste 330, -;; Boston MA 02111-1307, USA; either version 2 of the License, or -;; (at your option) any later version; incorporated herein by reference. -;; -;; ----------------------------------------------------------------------- - -;; -;; serirq.inc -;; -;; Serial port IRQ code -;; -;; We don't know what IRQ, if any, we have, so map all of them... -;; - - section .text16 - bits 16 - align 8 - - section .bss16 - alignb 8 - -%assign n 0 -%rep 16 - section .text16 -serstub_irq %+ n : - push dword [cs:oldirq %+ n] - jmp short irq_common - - section .bss16 -oldirq %+ n resd 1 -%assign n n+1 -%endrep - - section .text16 -irq_common: - pushf - push ax - push dx - mov dx,[cs:SerialPort] - add dx,5 ; DX -> LSR - in al,dx - test al,1 ; Received data - jnz .data -.done: - pop dx - pop ax - popf - retf ; Chain to next handler -.data: - push es - push di - mov ax,aux_seg + (aux.serial >> 4) - mov es,ax - mov di,[cs:SerialHead] -.loop: - mov dx,[cs:SerialPort] ; DX -> RDR - in al,dx - stosb - mov ah,[cs:FlowIgnore] - add dx,5 ; DX -> LSR - in al,dx - push ax - and al,ah - cmp al,ah - jne .drop - and di,serial_buf_size-1 ; Wrap around if necessary - cmp di,[cs:SerialTail] ; Would this cause overflow? - je .drop ; If so, just drop the data - mov [cs:SerialHead],di -.drop: - pop ax - test al,1 ; More data? - jnz .loop -.full: - pop di - pop es - jmp .done - - section .bss16 -; -; SerialIRQPort will generally track SerialPort, but will be 0 when an -; IRQ service is not installed. -; -SerialIRQPort resw 1 ; Serial port w IRQ service -SerialHead resw 1 ; Head of serial port rx buffer -SerialTail resw 1 ; Tail of serial port rx buffer - - section .bss16 -IRQMask resw 1 ; PIC IRQ mask status - - section .text16 - -sirq_install: - pushad - - call sirq_cleanup - - ; Save the old interrupt vectors - mov si,4*08h - mov di,oldirq0 - mov cx,8 - rep movsd - mov si,4*70h - mov cx,8 - rep movsd - - ; Install new interrupt vectors - mov di,4*08h - mov cx,8 - mov eax,serstub_irq0 -.pic0: - stosd - add ax,serstub_irq1 - serstub_irq0 - loop .pic0 - mov di,4*70h - mov cx,8 -.pic1: - stosd - add ax,serstub_irq1 - serstub_irq0 - loop .pic1 - - mov bx,[SerialPort] - mov [SerialIRQPort],bx - - lea dx,[bx+5] ; DX -> LCR - mov al,03h ; Clear DLAB (should already be...) - slow_out dx,al - - lea dx,[bx+1] ; DX -> IER - mov al,1 ; Enable receive interrupt - slow_out dx,al - - ; - ; Enable all ther interupt lines at the PIC. Some BIOSes - ; only enable the timer interrupts and other interrupts - ; actively in use by the BIOS. - ; - in al,0xA1 ; Secondary PIC mask register - mov ah,al - in al,0x21 ; Primary PIC mask register - mov [IRQMask],ax - - io_delay - - xor ax,ax ; Remove all interrupt masks - out 0x21,al - out 0xA1,al - - popad - ret - -sirq_cleanup_nowipe: - pushad - push ds - push es - xor ax,ax - mov ds,ax - mov es,ax - - mov bx,[SerialIRQPort] - and bx,bx - jz .done - - lea dx,[bx+5] ; DX -> LCR - mov al,03h ; Clear DLAB (should already be...) - slow_out dx,al - - lea dx,[bx+1] ; DX -> IER - xor ax,ax - slow_out dx,al ; Clear IER - - ; Restore PIC masks - mov ax,[IRQMask] - out 0x21,al - mov al,ah - out 0xA1,al - - ; Restore the original interrupt vectors - mov si,oldirq0 - mov di,4*08h - mov cx,8 - rep movsd - mov di,4*70h - mov cx,8 - rep movsd - - xor ax,ax - mov [SerialIRQPort],ax ; No active interrupt system - -.done: - pop es - pop ds - popad - ret - -sirq_cleanup: - call sirq_cleanup_nowipe - pushad - push es - ; Just in case it might contain a password, erase the - ; serial port receive buffer... - mov ax,aux_seg + (aux.serial >> 4) - mov es,ax - xor eax,eax - mov [cs:SerialHead],eax - mov cx,serial_buf_size >> 2 - xor di,di - rep stosd - pop es - popad - ret - - section .text16 |