| Heiko Carstens | 2c2df11 | 2010-02-26 22:37:34 +0100 | [diff] [blame] | 1 | /* |
| 2 | * 31-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 | stm %r6,%r15,__SF_GPRS(%r15) |
| 23 | lr %r1,%r15 |
| 24 | ahi %r15,-STACK_FRAME_OVERHEAD |
| 25 | st %r1,__SF_BACKCHAIN(%r15) |
| 26 | basr %r13,0 |
| 27 | 0: la %r1,.gprregs_addr-0b(%r13) |
| 28 | l %r1,0(%r1) |
| 29 | stm %r0,%r15,0(%r1) |
| 30 | 1: sigp %r0,%r6,__SIGP_RESTART /* start destination CPU */ |
| 31 | brc 2,1b /* busy, try again */ |
| 32 | 2: sigp %r0,%r5,__SIGP_STOP /* stop current CPU */ |
| 33 | brc 2,2b /* busy, try again */ |
| 34 | 3: j 3b |
| 35 | |
| 36 | .globl smp_restart_cpu |
| 37 | smp_restart_cpu: |
| 38 | basr %r13,0 |
| 39 | 0: la %r1,.gprregs_addr-0b(%r13) |
| 40 | l %r1,0(%r1) |
| 41 | lm %r0,%r15,0(%r1) |
| 42 | 1: sigp %r0,%r5,__SIGP_SENSE /* Wait for calling CPU */ |
| 43 | brc 10,1b /* busy, accepted (status 0), running */ |
| 44 | tmll %r0,0x40 /* Test if calling CPU is stopped */ |
| 45 | jz 1b |
| 46 | ltr %r4,%r4 /* New stack ? */ |
| 47 | jz 1f |
| 48 | lr %r15,%r4 |
| 49 | 1: basr %r14,%r2 |
| 50 | |
| 51 | .gprregs_addr: |
| 52 | .long .gprregs |
| 53 | |
| 54 | .section .data,"aw",@progbits |
| 55 | .gprregs: |
| 56 | .rept 16 |
| 57 | .long 0 |
| 58 | .endr |