diff options
Diffstat (limited to 'arch/powerpc/sysdev/dcr.S')
| -rw-r--r-- | arch/powerpc/sysdev/dcr.S | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/dcr.S b/arch/powerpc/sysdev/dcr.S new file mode 100644 index 00000000000..895f10243a4 --- /dev/null +++ b/arch/powerpc/sysdev/dcr.S @@ -0,0 +1,41 @@ +/* + * arch/ppc/syslib/dcr.S + * + * "Indirect" DCR access + * + * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net> + * + * 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/ppc_asm.h> +#include <asm/processor.h> + +#define DCR_ACCESS_PROLOG(table) \ + rlwinm r3,r3,4,18,27; \ + lis r5,table@h; \ + ori r5,r5,table@l; \ + add r3,r3,r5; \ + mtctr r3; \ + bctr + +_GLOBAL(__mfdcr) + DCR_ACCESS_PROLOG(__mfdcr_table) + +_GLOBAL(__mtdcr) + DCR_ACCESS_PROLOG(__mtdcr_table) + +__mfdcr_table: + mfdcr r3,0; blr +__mtdcr_table: + mtdcr 0,r4; blr + +dcr = 1 + .rept 1023 + mfdcr r3,dcr; blr + mtdcr dcr,r4; blr + dcr = dcr + 1 + .endr |