| /* |
| * 31-bit switch cpu code |
| * |
| * Copyright IBM Corp. 2009 |
| * |
| */ |
| |
| #include <asm/asm-offsets.h> |
| #include <asm/lowcore.h> |
| #include <asm/ptrace.h> |
| |
| # smp_switch_to_cpu switches to destination cpu and executes the passed function |
| # Parameter: %r2 - function to call |
| # %r3 - function parameter |
| # %r4 - stack poiner |
| # %r5 - current cpu |
| # %r6 - destination cpu |
| |
| .section .text |
| .align 4 |
| .globl smp_switch_to_cpu |
| smp_switch_to_cpu: |
| stm %r6,%r15,__SF_GPRS(%r15) |
| lr %r1,%r15 |
| ahi %r15,-STACK_FRAME_OVERHEAD |
| st %r1,__SF_BACKCHAIN(%r15) |
| basr %r13,0 |
| 0: la %r1,.gprregs_addr-0b(%r13) |
| l %r1,0(%r1) |
| stm %r0,%r15,0(%r1) |
| 1: sigp %r0,%r6,__SIGP_RESTART /* start destination CPU */ |
| brc 2,1b /* busy, try again */ |
| 2: sigp %r0,%r5,__SIGP_STOP /* stop current CPU */ |
| brc 2,2b /* busy, try again */ |
| 3: j 3b |
| |
| .globl smp_restart_cpu |
| smp_restart_cpu: |
| basr %r13,0 |
| 0: la %r1,.gprregs_addr-0b(%r13) |
| l %r1,0(%r1) |
| lm %r0,%r15,0(%r1) |
| 1: sigp %r0,%r5,__SIGP_SENSE /* Wait for calling CPU */ |
| brc 10,1b /* busy, accepted (status 0), running */ |
| tmll %r0,0x40 /* Test if calling CPU is stopped */ |
| jz 1b |
| ltr %r4,%r4 /* New stack ? */ |
| jz 1f |
| lr %r15,%r4 |
| 1: basr %r14,%r2 |
| |
| .gprregs_addr: |
| .long .gprregs |
| |
| .section .data,"aw",@progbits |
| .gprregs: |
| .rept 16 |
| .long 0 |
| .endr |
