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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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cbb870c822
Use asm offsets to make sure the offset defines to struct _lowcore and its layout don't get out of sync. Also add a BUILD_BUG_ON() which checks that the size of the structure is sane. And while being at it change those sites which use odd casts to access the current lowcore. These should use S390_lowcore instead. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
52 lines
1.1 KiB
ArmAsm
52 lines
1.1 KiB
ArmAsm
/*
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* 64-bit switch cpu code
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*
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* Copyright IBM Corp. 2009
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*
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*/
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#include <asm/asm-offsets.h>
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#include <asm/ptrace.h>
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# smp_switch_to_cpu switches to destination cpu and executes the passed function
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# Parameter: %r2 - function to call
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# %r3 - function parameter
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# %r4 - stack poiner
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# %r5 - current cpu
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# %r6 - destination cpu
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.section .text
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.align 4
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.globl smp_switch_to_cpu
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smp_switch_to_cpu:
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stmg %r6,%r15,__SF_GPRS(%r15)
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lgr %r1,%r15
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aghi %r15,-STACK_FRAME_OVERHEAD
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stg %r1,__SF_BACKCHAIN(%r15)
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larl %r1,.gprregs
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stmg %r0,%r15,0(%r1)
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1: sigp %r0,%r6,__SIGP_RESTART /* start destination CPU */
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brc 2,1b /* busy, try again */
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2: sigp %r0,%r5,__SIGP_STOP /* stop current CPU */
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brc 2,2b /* busy, try again */
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3: j 3b
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.globl smp_restart_cpu
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smp_restart_cpu:
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larl %r1,.gprregs
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lmg %r0,%r15,0(%r1)
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1: sigp %r0,%r5,__SIGP_SENSE /* Wait for calling CPU */
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brc 10,1b /* busy, accepted (status 0), running */
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tmll %r0,0x40 /* Test if calling CPU is stopped */
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jz 1b
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ltgr %r4,%r4 /* New stack ? */
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jz 1f
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lgr %r15,%r4
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1: basr %r14,%r2
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.section .data,"aw",@progbits
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.gprregs:
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.rept 16
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.quad 0
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.endr
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