嵌入式Linux

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Unix_Linux

debug-macro.S：源码内容

							/* linux/include/asm-arm/arch-ixp4xx/debug-macro.S
 *
 * Debugging macro include header
 *
 *  Copyright (C) 1994-1999 Russell King
 *  Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/
                .macro  addruart,rx
                mrc     p15, 0, rx, c1, c0
                tst     rx, #1                 @ MMU enabled?
                moveq   rx, #0xc8000000
                movne   rx, #0xff000000
		orrne	rx, rx, #0x00b00000
                add     rx,rx,#3              @ Uart regs are at off set of 3 if
						@ byte writes used - Big Endian.
                .endm
               .macro  senduart,rd,rx
                strb    rd, [rx]
                .endm
                .macro  waituart,rd,rx
1002:           ldrb    rd, [rx, #0x14]
                and     rd, rd, #0x60		@ check THRE and TEMT bits
                teq     rd, #0x60
                bne     1002b
                .endm
                .macro  busyuart,rd,rx
                .endm

						