630 lines
13 KiB
ArmAsm
630 lines
13 KiB
ArmAsm
/*
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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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* 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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*/
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#include <linux/sys.h>
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#include <asm/unistd.h>
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#include <asm/errno.h>
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#include <asm/processor.h>
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#include <asm/page.h>
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#include <asm/cache.h>
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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#include <asm/cputable.h>
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#include <asm/thread_info.h>
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.text
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#ifdef CONFIG_IRQSTACKS
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_GLOBAL(call_do_softirq)
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mflr r0
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std r0,16(r1)
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stdu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3)
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mr r1,r3
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bl .__do_softirq
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ld r1,0(r1)
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ld r0,16(r1)
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mtlr r0
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blr
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_GLOBAL(call_handle_irq)
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ld r8,0(r6)
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mflr r0
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std r0,16(r1)
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mtctr r8
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stdu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r5)
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mr r1,r5
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bctrl
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ld r1,0(r1)
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ld r0,16(r1)
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mtlr r0
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blr
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#endif /* CONFIG_IRQSTACKS */
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.section ".toc","aw"
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PPC64_CACHES:
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.tc ppc64_caches[TC],ppc64_caches
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.section ".text"
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/*
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* Write any modified data cache blocks out to memory
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* and invalidate the corresponding instruction cache blocks.
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*
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* flush_icache_range(unsigned long start, unsigned long stop)
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*
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* flush all bytes from start through stop-1 inclusive
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*/
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_KPROBE(__flush_icache_range)
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/*
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* Flush the data cache to memory
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*
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* Different systems have different cache line sizes
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* and in some cases i-cache and d-cache line sizes differ from
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* each other.
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*/
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ld r10,PPC64_CACHES@toc(r2)
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lwz r7,DCACHEL1LINESIZE(r10)/* Get cache line size */
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addi r5,r7,-1
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andc r6,r3,r5 /* round low to line bdy */
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subf r8,r6,r4 /* compute length */
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add r8,r8,r5 /* ensure we get enough */
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lwz r9,DCACHEL1LOGLINESIZE(r10) /* Get log-2 of cache line size */
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srw. r8,r8,r9 /* compute line count */
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beqlr /* nothing to do? */
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mtctr r8
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1: dcbst 0,r6
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add r6,r6,r7
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bdnz 1b
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sync
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/* Now invalidate the instruction cache */
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lwz r7,ICACHEL1LINESIZE(r10) /* Get Icache line size */
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addi r5,r7,-1
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andc r6,r3,r5 /* round low to line bdy */
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subf r8,r6,r4 /* compute length */
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add r8,r8,r5
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lwz r9,ICACHEL1LOGLINESIZE(r10) /* Get log-2 of Icache line size */
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srw. r8,r8,r9 /* compute line count */
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beqlr /* nothing to do? */
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mtctr r8
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2: icbi 0,r6
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add r6,r6,r7
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bdnz 2b
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isync
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blr
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.previous .text
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/*
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* Like above, but only do the D-cache.
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*
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* flush_dcache_range(unsigned long start, unsigned long stop)
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*
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* flush all bytes from start to stop-1 inclusive
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*/
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_GLOBAL(flush_dcache_range)
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/*
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* Flush the data cache to memory
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*
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* Different systems have different cache line sizes
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*/
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ld r10,PPC64_CACHES@toc(r2)
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lwz r7,DCACHEL1LINESIZE(r10) /* Get dcache line size */
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addi r5,r7,-1
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andc r6,r3,r5 /* round low to line bdy */
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subf r8,r6,r4 /* compute length */
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add r8,r8,r5 /* ensure we get enough */
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lwz r9,DCACHEL1LOGLINESIZE(r10) /* Get log-2 of dcache line size */
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srw. r8,r8,r9 /* compute line count */
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beqlr /* nothing to do? */
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mtctr r8
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0: dcbst 0,r6
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add r6,r6,r7
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bdnz 0b
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sync
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blr
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/*
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* Like above, but works on non-mapped physical addresses.
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* Use only for non-LPAR setups ! It also assumes real mode
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* is cacheable. Used for flushing out the DART before using
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* it as uncacheable memory
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*
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* flush_dcache_phys_range(unsigned long start, unsigned long stop)
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*
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* flush all bytes from start to stop-1 inclusive
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*/
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_GLOBAL(flush_dcache_phys_range)
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ld r10,PPC64_CACHES@toc(r2)
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lwz r7,DCACHEL1LINESIZE(r10) /* Get dcache line size */
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addi r5,r7,-1
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andc r6,r3,r5 /* round low to line bdy */
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subf r8,r6,r4 /* compute length */
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add r8,r8,r5 /* ensure we get enough */
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lwz r9,DCACHEL1LOGLINESIZE(r10) /* Get log-2 of dcache line size */
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srw. r8,r8,r9 /* compute line count */
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beqlr /* nothing to do? */
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mfmsr r5 /* Disable MMU Data Relocation */
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ori r0,r5,MSR_DR
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xori r0,r0,MSR_DR
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sync
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mtmsr r0
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sync
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isync
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mtctr r8
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0: dcbst 0,r6
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add r6,r6,r7
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bdnz 0b
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sync
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isync
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mtmsr r5 /* Re-enable MMU Data Relocation */
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sync
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isync
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blr
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_GLOBAL(flush_inval_dcache_range)
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ld r10,PPC64_CACHES@toc(r2)
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lwz r7,DCACHEL1LINESIZE(r10) /* Get dcache line size */
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addi r5,r7,-1
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andc r6,r3,r5 /* round low to line bdy */
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subf r8,r6,r4 /* compute length */
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add r8,r8,r5 /* ensure we get enough */
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lwz r9,DCACHEL1LOGLINESIZE(r10)/* Get log-2 of dcache line size */
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srw. r8,r8,r9 /* compute line count */
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beqlr /* nothing to do? */
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sync
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isync
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mtctr r8
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0: dcbf 0,r6
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add r6,r6,r7
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bdnz 0b
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sync
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isync
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blr
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/*
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* Flush a particular page from the data cache to RAM.
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* Note: this is necessary because the instruction cache does *not*
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* snoop from the data cache.
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*
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* void __flush_dcache_icache(void *page)
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*/
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_GLOBAL(__flush_dcache_icache)
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/*
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* Flush the data cache to memory
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*
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* Different systems have different cache line sizes
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*/
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/* Flush the dcache */
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ld r7,PPC64_CACHES@toc(r2)
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clrrdi r3,r3,PAGE_SHIFT /* Page align */
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lwz r4,DCACHEL1LINESPERPAGE(r7) /* Get # dcache lines per page */
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lwz r5,DCACHEL1LINESIZE(r7) /* Get dcache line size */
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mr r6,r3
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mtctr r4
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0: dcbst 0,r6
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add r6,r6,r5
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bdnz 0b
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sync
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/* Now invalidate the icache */
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lwz r4,ICACHEL1LINESPERPAGE(r7) /* Get # icache lines per page */
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lwz r5,ICACHEL1LINESIZE(r7) /* Get icache line size */
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mtctr r4
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1: icbi 0,r3
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add r3,r3,r5
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bdnz 1b
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isync
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blr
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#if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_MAPLE)
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/*
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* Do an IO access in real mode
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*/
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_GLOBAL(real_readb)
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mfmsr r7
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ori r0,r7,MSR_DR
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xori r0,r0,MSR_DR
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sync
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mtmsrd r0
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sync
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isync
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mfspr r6,SPRN_HID4
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rldicl r5,r6,32,0
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ori r5,r5,0x100
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rldicl r5,r5,32,0
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sync
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mtspr SPRN_HID4,r5
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isync
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slbia
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isync
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lbz r3,0(r3)
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sync
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mtspr SPRN_HID4,r6
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isync
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slbia
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isync
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mtmsrd r7
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sync
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isync
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blr
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/*
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* Do an IO access in real mode
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*/
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_GLOBAL(real_writeb)
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mfmsr r7
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ori r0,r7,MSR_DR
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xori r0,r0,MSR_DR
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sync
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mtmsrd r0
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sync
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isync
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mfspr r6,SPRN_HID4
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rldicl r5,r6,32,0
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ori r5,r5,0x100
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rldicl r5,r5,32,0
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sync
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mtspr SPRN_HID4,r5
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isync
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slbia
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isync
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stb r3,0(r4)
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sync
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mtspr SPRN_HID4,r6
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isync
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slbia
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isync
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mtmsrd r7
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sync
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isync
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blr
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#endif /* defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_MAPLE) */
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#ifdef CONFIG_PPC_PASEMI
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/* No support in all binutils for these yet, so use defines */
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#define LBZCIX(RT,RA,RB) .long (0x7c0006aa|(RT<<21)|(RA<<16)|(RB << 11))
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#define STBCIX(RS,RA,RB) .long (0x7c0007aa|(RS<<21)|(RA<<16)|(RB << 11))
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_GLOBAL(real_205_readb)
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mfmsr r7
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ori r0,r7,MSR_DR
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xori r0,r0,MSR_DR
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sync
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mtmsrd r0
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sync
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isync
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LBZCIX(r3,0,r3)
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isync
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mtmsrd r7
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sync
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isync
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blr
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_GLOBAL(real_205_writeb)
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mfmsr r7
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ori r0,r7,MSR_DR
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xori r0,r0,MSR_DR
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sync
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mtmsrd r0
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sync
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isync
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STBCIX(r3,0,r4)
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isync
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mtmsrd r7
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sync
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isync
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blr
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#endif /* CONFIG_PPC_PASEMI */
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#ifdef CONFIG_CPU_FREQ_PMAC64
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/*
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* SCOM access functions for 970 (FX only for now)
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*
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* unsigned long scom970_read(unsigned int address);
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* void scom970_write(unsigned int address, unsigned long value);
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*
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* The address passed in is the 24 bits register address. This code
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* is 970 specific and will not check the status bits, so you should
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* know what you are doing.
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*/
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_GLOBAL(scom970_read)
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/* interrupts off */
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mfmsr r4
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ori r0,r4,MSR_EE
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xori r0,r0,MSR_EE
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mtmsrd r0,1
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/* rotate 24 bits SCOM address 8 bits left and mask out it's low 8 bits
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* (including parity). On current CPUs they must be 0'd,
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* and finally or in RW bit
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*/
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rlwinm r3,r3,8,0,15
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ori r3,r3,0x8000
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/* do the actual scom read */
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sync
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mtspr SPRN_SCOMC,r3
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isync
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mfspr r3,SPRN_SCOMD
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isync
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mfspr r0,SPRN_SCOMC
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isync
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/* XXX: fixup result on some buggy 970's (ouch ! we lost a bit, bah
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* that's the best we can do). Not implemented yet as we don't use
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* the scom on any of the bogus CPUs yet, but may have to be done
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* ultimately
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*/
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/* restore interrupts */
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mtmsrd r4,1
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blr
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_GLOBAL(scom970_write)
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/* interrupts off */
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mfmsr r5
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ori r0,r5,MSR_EE
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xori r0,r0,MSR_EE
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mtmsrd r0,1
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/* rotate 24 bits SCOM address 8 bits left and mask out it's low 8 bits
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* (including parity). On current CPUs they must be 0'd.
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*/
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rlwinm r3,r3,8,0,15
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sync
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mtspr SPRN_SCOMD,r4 /* write data */
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isync
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mtspr SPRN_SCOMC,r3 /* write command */
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isync
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mfspr 3,SPRN_SCOMC
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isync
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/* restore interrupts */
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mtmsrd r5,1
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blr
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#endif /* CONFIG_CPU_FREQ_PMAC64 */
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/*
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* Create a kernel thread
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* kernel_thread(fn, arg, flags)
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*/
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_GLOBAL(kernel_thread)
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std r29,-24(r1)
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std r30,-16(r1)
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stdu r1,-STACK_FRAME_OVERHEAD(r1)
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mr r29,r3
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mr r30,r4
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ori r3,r5,CLONE_VM /* flags */
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oris r3,r3,(CLONE_UNTRACED>>16)
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li r4,0 /* new sp (unused) */
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li r0,__NR_clone
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sc
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bns+ 1f /* did system call indicate error? */
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neg r3,r3 /* if so, make return code negative */
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1: cmpdi 0,r3,0 /* parent or child? */
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bne 2f /* return if parent */
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li r0,0
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stdu r0,-STACK_FRAME_OVERHEAD(r1)
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ld r2,8(r29)
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ld r29,0(r29)
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mtlr r29 /* fn addr in lr */
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mr r3,r30 /* load arg and call fn */
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blrl
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li r0,__NR_exit /* exit after child exits */
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li r3,0
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sc
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2: addi r1,r1,STACK_FRAME_OVERHEAD
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ld r29,-24(r1)
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ld r30,-16(r1)
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blr
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/*
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* disable_kernel_fp()
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* Disable the FPU.
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*/
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_GLOBAL(disable_kernel_fp)
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mfmsr r3
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rldicl r0,r3,(63-MSR_FP_LG),1
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rldicl r3,r0,(MSR_FP_LG+1),0
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mtmsrd r3 /* disable use of fpu now */
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isync
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blr
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/* kexec_wait(phys_cpu)
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*
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* wait for the flag to change, indicating this kernel is going away but
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* the slave code for the next one is at addresses 0 to 100.
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*
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* This is used by all slaves.
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*
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* Physical (hardware) cpu id should be in r3.
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*/
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_GLOBAL(kexec_wait)
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bl 1f
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1: mflr r5
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addi r5,r5,kexec_flag-1b
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99: HMT_LOW
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#ifdef CONFIG_KEXEC /* use no memory without kexec */
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lwz r4,0(r5)
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cmpwi 0,r4,0
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bnea 0x60
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#endif
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b 99b
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/* this can be in text because we won't change it until we are
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* running in real anyways
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*/
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kexec_flag:
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.long 0
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#ifdef CONFIG_KEXEC
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/* kexec_smp_wait(void)
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*
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* call with interrupts off
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* note: this is a terminal routine, it does not save lr
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*
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* get phys id from paca
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* set paca id to -1 to say we got here
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* switch to real mode
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* join other cpus in kexec_wait(phys_id)
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*/
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_GLOBAL(kexec_smp_wait)
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lhz r3,PACAHWCPUID(r13)
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li r4,-1
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sth r4,PACAHWCPUID(r13) /* let others know we left */
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bl real_mode
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b .kexec_wait
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/*
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* switch to real mode (turn mmu off)
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* we use the early kernel trick that the hardware ignores bits
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* 0 and 1 (big endian) of the effective address in real mode
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*
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* don't overwrite r3 here, it is live for kexec_wait above.
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*/
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real_mode: /* assume normal blr return */
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1: li r9,MSR_RI
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li r10,MSR_DR|MSR_IR
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mflr r11 /* return address to SRR0 */
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mfmsr r12
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andc r9,r12,r9
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andc r10,r12,r10
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mtmsrd r9,1
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mtspr SPRN_SRR1,r10
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mtspr SPRN_SRR0,r11
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rfid
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/*
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* kexec_sequence(newstack, start, image, control, clear_all())
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*
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* does the grungy work with stack switching and real mode switches
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* also does simple calls to other code
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*/
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_GLOBAL(kexec_sequence)
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mflr r0
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std r0,16(r1)
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/* switch stacks to newstack -- &kexec_stack.stack */
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stdu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3)
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mr r1,r3
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li r0,0
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std r0,16(r1)
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/* save regs for local vars on new stack.
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* yes, we won't go back, but ...
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*/
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std r31,-8(r1)
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std r30,-16(r1)
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std r29,-24(r1)
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std r28,-32(r1)
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std r27,-40(r1)
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std r26,-48(r1)
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std r25,-56(r1)
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stdu r1,-STACK_FRAME_OVERHEAD-64(r1)
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/* save args into preserved regs */
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mr r31,r3 /* newstack (both) */
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mr r30,r4 /* start (real) */
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mr r29,r5 /* image (virt) */
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mr r28,r6 /* control, unused */
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mr r27,r7 /* clear_all() fn desc */
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mr r26,r8 /* spare */
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lhz r25,PACAHWCPUID(r13) /* get our phys cpu from paca */
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/* disable interrupts, we are overwriting kernel data next */
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mfmsr r3
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rlwinm r3,r3,0,17,15
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mtmsrd r3,1
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/* copy dest pages, flush whole dest image */
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mr r3,r29
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bl .kexec_copy_flush /* (image) */
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/* turn off mmu */
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bl real_mode
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/* copy 0x100 bytes starting at start to 0 */
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li r3,0
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mr r4,r30 /* start, aka phys mem offset */
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li r5,0x100
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li r6,0
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bl .copy_and_flush /* (dest, src, copy limit, start offset) */
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1: /* assume normal blr return */
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/* release other cpus to the new kernel secondary start at 0x60 */
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mflr r5
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li r6,1
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stw r6,kexec_flag-1b(5)
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/* clear out hardware hash page table and tlb */
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ld r5,0(r27) /* deref function descriptor */
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mtctr r5
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bctrl /* ppc_md.hpte_clear_all(void); */
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/*
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* kexec image calling is:
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* the first 0x100 bytes of the entry point are copied to 0
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*
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* all slaves branch to slave = 0x60 (absolute)
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* slave(phys_cpu_id);
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*
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* master goes to start = entry point
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* start(phys_cpu_id, start, 0);
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*
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*
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* a wrapper is needed to call existing kernels, here is an approximate
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* description of one method:
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*
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* v2: (2.6.10)
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* start will be near the boot_block (maybe 0x100 bytes before it?)
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* it will have a 0x60, which will b to boot_block, where it will wait
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* and 0 will store phys into struct boot-block and load r3 from there,
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* copy kernel 0-0x100 and tell slaves to back down to 0x60 again
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*
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* v1: (2.6.9)
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* boot block will have all cpus scanning device tree to see if they
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* are the boot cpu ?????
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* other device tree differences (prop sizes, va vs pa, etc)...
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*/
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mr r3,r25 # my phys cpu
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mr r4,r30 # start, aka phys mem offset
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mtlr 4
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li r5,0
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blr /* image->start(physid, image->start, 0); */
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#endif /* CONFIG_KEXEC */
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