| Heiko Carstens | 2c2df11 | 2010-02-26 22:37:34 +0100 | [diff] [blame] | 1 | /* |
| 2 | * 64-bit switch cpu code |
| 3 | * |
| 4 | * Copyright IBM Corp. 2009 |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include <asm/asm-offsets.h> |
| Heiko Carstens | 2c2df11 | 2010-02-26 22:37:34 +0100 | [diff] [blame] | 9 | #include <asm/ptrace.h> |
| 10 | |
| 11 | # smp_switch_to_cpu switches to destination cpu and executes the passed function |
| 12 | # Parameter: %r2 - function to call |
| 13 | # %r3 - function parameter |
| 14 | # %r4 - stack poiner |
| 15 | # %r5 - current cpu |
| 16 | # %r6 - destination cpu |
| 17 | |
| 18 | .section .text |
| 19 | .align 4 |
| 20 | .globl smp_switch_to_cpu |
| 21 | smp_switch_to_cpu: |
| 22 | stmg %r6,%r15,__SF_GPRS(%r15) |
| 23 | lgr %r1,%r15 |
| 24 | aghi %r15,-STACK_FRAME_OVERHEAD |
| 25 | stg %r1,__SF_BACKCHAIN(%r15) |
| 26 | larl %r1,.gprregs |
| 27 | stmg %r0,%r15,0(%r1) |
| 28 | 1: sigp %r0,%r6,__SIGP_RESTART /* start destination CPU */ |
| 29 | brc 2,1b /* busy, try again */ |
| 30 | 2: sigp %r0,%r5,__SIGP_STOP /* stop current CPU */ |
| 31 | brc 2,2b /* busy, try again */ |
| 32 | 3: j 3b |
| 33 | |
| 34 | .globl smp_restart_cpu |
| 35 | smp_restart_cpu: |
| 36 | larl %r1,.gprregs |
| 37 | lmg %r0,%r15,0(%r1) |
| 38 | 1: sigp %r0,%r5,__SIGP_SENSE /* Wait for calling CPU */ |
| 39 | brc 10,1b /* busy, accepted (status 0), running */ |
| 40 | tmll %r0,0x40 /* Test if calling CPU is stopped */ |
| 41 | jz 1b |
| 42 | ltgr %r4,%r4 /* New stack ? */ |
| 43 | jz 1f |
| 44 | lgr %r15,%r4 |
| Michael Holzheu | 034e9e9 | 2011-04-04 09:43:30 +0200 | [diff] [blame^] | 45 | 1: lgr %r14,%r2 /* r14: Function to call */ |
| 46 | lgr %r2,%r3 /* r2 : Parameter for function*/ |
| 47 | basr %r14,%r14 /* Call function */ |
| Heiko Carstens | 2c2df11 | 2010-02-26 22:37:34 +0100 | [diff] [blame] | 48 | |
| 49 | .section .data,"aw",@progbits |
| 50 | .gprregs: |
| 51 | .rept 16 |
| 52 | .quad 0 |
| 53 | .endr |