| /* |
| * This file contains miscellaneous low-level functions for PPC 44x. |
| * Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation. |
| * |
| * 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; either version |
| * 2 of the License, or (at your option) any later version. |
| * |
| */ |
| |
| #include <asm/reg.h> |
| #include <asm/ppc_asm.h> |
| |
| .text |
| |
| /* |
| * Do an IO access in AS1 |
| */ |
| _GLOBAL(as1_readb) |
| mfmsr r7 |
| ori r0,r7,MSR_DS |
| sync |
| mtmsr r0 |
| sync |
| isync |
| lbz r3,0(r3) |
| sync |
| mtmsr r7 |
| sync |
| isync |
| blr |
| |
| _GLOBAL(as1_writeb) |
| mfmsr r7 |
| ori r0,r7,MSR_DS |
| sync |
| mtmsr r0 |
| sync |
| isync |
| stb r3,0(r4) |
| sync |
| mtmsr r7 |
| sync |
| isync |
| blr |
