1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2/* 3 * This file contains miscellaneous low-level functions for PPC 44x. 4 * Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation. 5 */ 6 7#include <asm/reg.h> 8#include <asm/ppc_asm.h> 9 10 .text 11 12/* 13 * Do an IO access in AS1 14 */ 15_GLOBAL(as1_readb) 16 mfmsr r7 17 ori r0,r7,MSR_DS 18 sync 19 mtmsr r0 20 sync 21 isync 22 lbz r3,0(r3) 23 sync 24 mtmsr r7 25 sync 26 isync 27 blr 28 29_GLOBAL(as1_writeb) 30 mfmsr r7 31 ori r0,r7,MSR_DS 32 sync 33 mtmsr r0 34 sync 35 isync 36 stb r3,0(r4) 37 sync 38 mtmsr r7 39 sync 40 isync 41 blr 42