diff options
Diffstat (limited to 'arch/powerpc/platforms/iseries/exception.S')
| -rw-r--r-- | arch/powerpc/platforms/iseries/exception.S | 59 |
1 files changed, 35 insertions, 24 deletions
diff --git a/arch/powerpc/platforms/iseries/exception.S b/arch/powerpc/platforms/iseries/exception.S index a67984c0495..29c02f36b32 100644 --- a/arch/powerpc/platforms/iseries/exception.S +++ b/arch/powerpc/platforms/iseries/exception.S @@ -61,29 +61,31 @@ system_reset_iSeries: /* Spin on __secondary_hold_spinloop until it is updated by the boot cpu. */ /* In the UP case we'll yield() later, and we will not access the paca anyway */ #ifdef CONFIG_SMP -1: +iSeries_secondary_wait_paca: HMT_LOW LOAD_REG_ADDR(r23, __secondary_hold_spinloop) ld r23,0(r23) - sync - LOAD_REG_ADDR(r3,current_set) - sldi r28,r24,3 /* get current_set[cpu#] */ - ldx r3,r3,r28 - addi r1,r3,THREAD_SIZE - subi r1,r1,STACK_FRAME_OVERHEAD - cmpwi 0,r23,0 /* Keep poking the Hypervisor until */ - bne 2f /* we're released */ - /* Let the Hypervisor know we are alive */ + cmpdi 0,r23,0 + bne 2f /* go on when the master is ready */ + + /* Keep poking the Hypervisor until we're released */ /* 8002 is a call to HvCallCfg::getLps, a harmless Hypervisor function */ lis r3,0x8002 rldicr r3,r3,32,15 /* r0 = (r3 << 32) & 0xffff000000000000 */ li r0,-1 /* r0=-1 indicates a Hypervisor call */ sc /* Invoke the hypervisor via a system call */ - b 1b -#endif + b iSeries_secondary_wait_paca 2: + HMT_MEDIUM + sync + + LOAD_REG_ADDR(r3, nr_cpu_ids) /* get number of pacas allocated */ + lwz r3,0(r3) /* nr_cpus= or NR_CPUS can limit */ + cmpld 0,r24,r3 /* is our cpu number allocated? */ + bge iSeries_secondary_yield /* no, yield forever */ + /* Load our paca now that it's been allocated */ LOAD_REG_ADDR(r13, paca) ld r13,0(r13) @@ -94,10 +96,24 @@ system_reset_iSeries: ori r23,r23,MSR_RI mtmsrd r23 /* RI on */ - HMT_LOW -#ifdef CONFIG_SMP +iSeries_secondary_smp_loop: lbz r23,PACAPROCSTART(r13) /* Test if this processor * should start */ + cmpwi 0,r23,0 + bne 3f /* go on when we are told */ + + HMT_LOW + /* Let the Hypervisor know we are alive */ + /* 8002 is a call to HvCallCfg::getLps, a harmless Hypervisor function */ + lis r3,0x8002 + rldicr r3,r3,32,15 /* r0 = (r3 << 32) & 0xffff000000000000 */ + li r0,-1 /* r0=-1 indicates a Hypervisor call */ + sc /* Invoke the hypervisor via a system call */ + mfspr r13,SPRN_SPRG_PACA /* Put r13 back ???? */ + b iSeries_secondary_smp_loop /* wait for signal to start */ + +3: + HMT_MEDIUM sync LOAD_REG_ADDR(r3,current_set) sldi r28,r24,3 /* get current_set[cpu#] */ @@ -105,27 +121,22 @@ system_reset_iSeries: addi r1,r3,THREAD_SIZE subi r1,r1,STACK_FRAME_OVERHEAD - cmpwi 0,r23,0 - beq iSeries_secondary_smp_loop /* Loop until told to go */ b __secondary_start /* Loop until told to go */ -iSeries_secondary_smp_loop: - /* Let the Hypervisor know we are alive */ - /* 8002 is a call to HvCallCfg::getLps, a harmless Hypervisor function */ - lis r3,0x8002 - rldicr r3,r3,32,15 /* r0 = (r3 << 32) & 0xffff000000000000 */ -#else /* CONFIG_SMP */ +#endif /* CONFIG_SMP */ + +iSeries_secondary_yield: /* Yield the processor. This is required for non-SMP kernels which are running on multi-threaded machines. */ + HMT_LOW lis r3,0x8000 rldicr r3,r3,32,15 /* r3 = (r3 << 32) & 0xffff000000000000 */ addi r3,r3,18 /* r3 = 0x8000000000000012 which is "yield" */ li r4,0 /* "yield timed" */ li r5,-1 /* "yield forever" */ -#endif /* CONFIG_SMP */ li r0,-1 /* r0=-1 indicates a Hypervisor call */ sc /* Invoke the hypervisor via a system call */ mfspr r13,SPRN_SPRG_PACA /* Put r13 back ???? */ - b 2b /* If SMP not configured, secondaries + b iSeries_secondary_yield /* If SMP not configured, secondaries * loop forever */ /*** ISeries-LPAR interrupt handlers ***/ |