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204 lines
3.0 KiB
204 lines
3.0 KiB
19 years ago
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/*
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* This file contains miscellaneous low-level functions.
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
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* and Paul Mackerras.
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*
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* Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
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* PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <asm/ppc_asm.h>
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.text
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#ifdef CONFIG_PPC64
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#define IN_SYNC twi 0,r5,0; isync
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#define EIEIO_32
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#define SYNC_64 sync
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#else /* CONFIG_PPC32 */
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#define IN_SYNC
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#define EIEIO_32 eieio
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#define SYNC_64
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#endif
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/*
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* Returns (address we are running at) - (address we were linked at)
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* for use before the text and data are mapped to KERNELBASE.
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*/
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_GLOBAL(reloc_offset)
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mflr r0
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bl 1f
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1: mflr r3
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LOAD_REG_IMMEDIATE(r4,1b)
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subf r3,r4,r3
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mtlr r0
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blr
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/*
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* add_reloc_offset(x) returns x + reloc_offset().
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*/
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_GLOBAL(add_reloc_offset)
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mflr r0
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bl 1f
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1: mflr r5
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LOAD_REG_IMMEDIATE(r4,1b)
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subf r5,r4,r5
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add r3,r3,r5
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mtlr r0
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blr
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/*
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* I/O string operations
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*
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* insb(port, buf, len)
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* outsb(port, buf, len)
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* insw(port, buf, len)
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* outsw(port, buf, len)
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* insl(port, buf, len)
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* outsl(port, buf, len)
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* insw_ns(port, buf, len)
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* outsw_ns(port, buf, len)
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* insl_ns(port, buf, len)
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* outsl_ns(port, buf, len)
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*
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* The *_ns versions don't do byte-swapping.
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*/
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_GLOBAL(_insb)
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cmpwi 0,r5,0
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mtctr r5
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subi r4,r4,1
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blelr-
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00: lbz r5,0(r3)
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eieio
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stbu r5,1(r4)
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bdnz 00b
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IN_SYNC
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blr
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_GLOBAL(_outsb)
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cmpwi 0,r5,0
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mtctr r5
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subi r4,r4,1
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blelr-
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00: lbzu r5,1(r4)
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stb r5,0(r3)
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EIEIO_32
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bdnz 00b
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SYNC_64
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blr
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_GLOBAL(_insw)
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cmpwi 0,r5,0
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mtctr r5
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subi r4,r4,2
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blelr-
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00: lhbrx r5,0,r3
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eieio
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sthu r5,2(r4)
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bdnz 00b
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IN_SYNC
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blr
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_GLOBAL(_outsw)
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cmpwi 0,r5,0
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mtctr r5
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subi r4,r4,2
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blelr-
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00: lhzu r5,2(r4)
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EIEIO_32
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sthbrx r5,0,r3
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bdnz 00b
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SYNC_64
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blr
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_GLOBAL(_insl)
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cmpwi 0,r5,0
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mtctr r5
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subi r4,r4,4
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blelr-
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00: lwbrx r5,0,r3
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eieio
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stwu r5,4(r4)
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bdnz 00b
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IN_SYNC
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blr
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_GLOBAL(_outsl)
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cmpwi 0,r5,0
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mtctr r5
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subi r4,r4,4
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blelr-
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00: lwzu r5,4(r4)
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stwbrx r5,0,r3
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EIEIO_32
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bdnz 00b
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SYNC_64
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blr
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#ifdef CONFIG_PPC32
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_GLOBAL(__ide_mm_insw)
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#endif
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_GLOBAL(_insw_ns)
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cmpwi 0,r5,0
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mtctr r5
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subi r4,r4,2
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blelr-
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00: lhz r5,0(r3)
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eieio
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sthu r5,2(r4)
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bdnz 00b
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IN_SYNC
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blr
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#ifdef CONFIG_PPC32
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_GLOBAL(__ide_mm_outsw)
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#endif
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_GLOBAL(_outsw_ns)
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cmpwi 0,r5,0
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mtctr r5
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subi r4,r4,2
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blelr-
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00: lhzu r5,2(r4)
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sth r5,0(r3)
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EIEIO_32
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bdnz 00b
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SYNC_64
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blr
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#ifdef CONFIG_PPC32
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_GLOBAL(__ide_mm_insl)
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#endif
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_GLOBAL(_insl_ns)
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cmpwi 0,r5,0
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mtctr r5
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subi r4,r4,4
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blelr-
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00: lwz r5,0(r3)
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eieio
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stwu r5,4(r4)
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bdnz 00b
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IN_SYNC
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blr
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#ifdef CONFIG_PPC32
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_GLOBAL(__ide_mm_outsl)
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#endif
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_GLOBAL(_outsl_ns)
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cmpwi 0,r5,0
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mtctr r5
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subi r4,r4,4
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blelr-
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00: lwzu r5,4(r4)
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stw r5,0(r3)
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EIEIO_32
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bdnz 00b
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SYNC_64
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blr
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