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44 lines
843 B
44 lines
843 B
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* "Indirect" DCR access |
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* |
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* Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net> |
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*/ |
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#include <asm/ppc_asm.h> |
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#include <asm/processor.h> |
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#include <asm/bug.h> |
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#include <asm/export.h> |
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#define DCR_ACCESS_PROLOG(table) \ |
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cmpli cr0,r3,1024; \ |
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rlwinm r3,r3,4,18,27; \ |
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lis r5,table@h; \ |
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ori r5,r5,table@l; \ |
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add r3,r3,r5; \ |
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bge- 1f; \ |
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mtctr r3; \ |
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bctr; \ |
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1: trap; \ |
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EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0; \ |
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blr |
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_GLOBAL(__mfdcr) |
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DCR_ACCESS_PROLOG(__mfdcr_table) |
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EXPORT_SYMBOL(__mfdcr) |
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_GLOBAL(__mtdcr) |
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DCR_ACCESS_PROLOG(__mtdcr_table) |
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EXPORT_SYMBOL(__mtdcr) |
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__mfdcr_table: |
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mfdcr r3,0; blr |
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__mtdcr_table: |
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mtdcr 0,r4; blr |
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dcr = 1 |
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.rept 1023 |
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mfdcr r3,dcr; blr |
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mtdcr dcr,r4; blr |
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dcr = dcr + 1 |
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.endr
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