59 lines
1.2 KiB
ArmAsm
59 lines
1.2 KiB
ArmAsm
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/*
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* 31-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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stm %r6,%r15,__SF_GPRS(%r15)
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lr %r1,%r15
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ahi %r15,-STACK_FRAME_OVERHEAD
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st %r1,__SF_BACKCHAIN(%r15)
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basr %r13,0
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0: la %r1,.gprregs_addr-0b(%r13)
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l %r1,0(%r1)
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stm %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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basr %r13,0
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0: la %r1,.gprregs_addr-0b(%r13)
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l %r1,0(%r1)
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lm %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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ltr %r4,%r4 /* New stack ? */
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jz 1f
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lr %r15,%r4
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1: basr %r14,%r2
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.gprregs_addr:
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.long .gprregs
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.section .data,"aw",@progbits
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.gprregs:
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.rept 16
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.long 0
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.endr
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