macros.h

来自「Uboot源码,非常通用的bootloader.适用于各种平台的Linux系统引」· C头文件 代码 · 共 85 行

#ifndef _MACROS_H
#define _MACROS_H

	/*
	** Load a long integer into a register
	*/
	.macro liw reg, value
		lis \reg, \value@h
		ori \reg, \reg, \value@l
	.endm


	/*
	** Generate config_addr request
	** This macro expects the values in registers:
	** r3 - bus
	** r4 - devfn
	** r5 - offset
	*/
	.macro config_addr
		rlwinm	r9, r5, 24, 0, 6
		rlwinm	r8, r4, 16, 0, 31
		rlwinm	r7, r3, 8, 0, 31
		or	r9, r8, r9
		or	r9, r7, r9
		ori	r9, r9, 0x80
		liw	r10, 0xfec00cf8
		stw	r9, 0(r10)
		eieio
		sync
	.endm


	/*
	** Generate config_data address
	*/
	.macro config_data mask
		andi.	r9, r5, \mask
		addi	r9, r9, 0xcfc
		oris	r9, r9, 0xfee0
	.endm


	/*
	** Write a byte value to an output port
	*/
	.macro outb port, value
		lis     r2, 0xfe00
		li      r0, \value
		stb     r0, \port(r2)
	.endm


	/*
	** Write a register byte value to an output port
	*/
	.macro outbr port, value
		lis     r2, 0xfe00
		stb     \value, \port(r2)
	.endm


	/*
	** Read a byte value from a port into a specified register
	*/
	.macro inb reg, port
		lis     r2, 0xfe00
		lbz     \reg, \port(r2)
	.endm


	/*
	** Write a byte to the SuperIO config area
	*/
	.macro siowb offset, value
		li      r3, 0
		li      r4, (7<<3)
		li      r5, \offset
		li      r6, \value
		bl      pci_write_cfg_byte
	.endm

#endif