1/* 2 * This file contains miscellaneous low-level functions for PPC 44x. 3 * Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License 7 * as published by the Free Software Foundation; either version 8 * 2 of the License, or (at your option) any later version. 9 * 10 */ 11 12#include <asm/reg.h> 13#include <asm/ppc_asm.h> 14 15 .text 16 17/* 18 * Do an IO access in AS1 19 */ 20_GLOBAL(as1_readb) 21 mfmsr r7 22 ori r0,r7,MSR_DS 23 sync 24 mtmsr r0 25 sync 26 isync 27 lbz r3,0(r3) 28 sync 29 mtmsr r7 30 sync 31 isync 32 blr 33 34_GLOBAL(as1_writeb) 35 mfmsr r7 36 ori r0,r7,MSR_DS 37 sync 38 mtmsr r0 39 sync 40 isync 41 stb r3,0(r4) 42 sync 43 mtmsr r7 44 sync 45 isync 46 blr 47