3356bb9f7b
At present the lppaca - the structure shared with the iSeries hypervisor and phyp - is contained within the PACA, our own low-level per-cpu structure. This doesn't have to be so, the patch below removes it, making a separate array of lppaca structures. This saves approximately 500*NR_CPUS bytes of image size and kernel memory, because we don't need aligning gap between the Linux and hypervisor portions of every PACA. On the other hand it means an extra level of dereference in many accesses to the lppaca. The patch also gets rid of several places where we assign the paca address to a local variable for no particular reason. Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
57 lines
1.4 KiB
ArmAsm
57 lines
1.4 KiB
ArmAsm
/*
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* This file contains miscellaneous low-level functions.
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* Copyright (C) 1995-2005 IBM Corp
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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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#include <asm/processor.h>
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#include <asm/asm-offsets.h>
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#include <asm/ppc_asm.h>
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.text
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/* unsigned long local_save_flags(void) */
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_GLOBAL(local_get_flags)
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lbz r3,PACAPROCENABLED(r13)
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blr
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/* unsigned long local_irq_disable(void) */
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_GLOBAL(local_irq_disable)
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lbz r3,PACAPROCENABLED(r13)
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li r4,0
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stb r4,PACAPROCENABLED(r13)
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blr /* Done */
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/* void local_irq_restore(unsigned long flags) */
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_GLOBAL(local_irq_restore)
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lbz r5,PACAPROCENABLED(r13)
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/* Check if things are setup the way we want _already_. */
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cmpw 0,r3,r5
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beqlr
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/* are we enabling interrupts? */
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cmpdi 0,r3,0
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stb r3,PACAPROCENABLED(r13)
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beqlr
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/* Check pending interrupts */
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/* A decrementer, IPI or PMC interrupt may have occurred
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* while we were in the hypervisor (which enables) */
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ld r4,PACALPPACAPTR(r13)
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ld r4,LPPACAANYINT(r4)
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cmpdi r4,0
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beqlr
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/*
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* Handle pending interrupts in interrupt context
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*/
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li r0,0x5555
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sc
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blr
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