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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
| commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
| tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /arch/powerpc/sysdev/dcr-low.S | |
| parent | Initial commit. (diff) | |
| download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip | |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/powerpc/sysdev/dcr-low.S')
| -rw-r--r-- | arch/powerpc/sysdev/dcr-low.S | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/dcr-low.S b/arch/powerpc/sysdev/dcr-low.S new file mode 100644 index 0000000000..e8401b205d --- /dev/null +++ b/arch/powerpc/sysdev/dcr-low.S @@ -0,0 +1,44 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * "Indirect" DCR access + * + * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net> + */ + +#include <linux/export.h> +#include <asm/ppc_asm.h> +#include <asm/processor.h> +#include <asm/bug.h> + +#define DCR_ACCESS_PROLOG(table) \ + cmplwi cr0,r3,1024; \ + rlwinm r3,r3,4,18,27; \ + lis r5,table@h; \ + ori r5,r5,table@l; \ + add r3,r3,r5; \ + bge- 1f; \ + mtctr r3; \ + bctr; \ +1: trap; \ + EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0; \ + blr + +_GLOBAL(__mfdcr) + DCR_ACCESS_PROLOG(__mfdcr_table) +EXPORT_SYMBOL(__mfdcr) + +_GLOBAL(__mtdcr) + DCR_ACCESS_PROLOG(__mtdcr_table) +EXPORT_SYMBOL(__mtdcr) + +__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 |