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this seems to solve the 'lock up on bootup on core 2' problem.

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Basically, there was a pretty subtle race between the cpus in main where if the main cpu released the AP cpus and then before the AP cpus had a chance to run the boot cpu started creating the main thread (which causes smp ici messages to be created) the system would livelock, where the boot cpu waited forever for the AP cpu to acknowledge the ICI (for a TLB flush when creating the kernel stack).
Added smp_cpu_rendezvous(), used to synchronize all the cpus to a particular point, and used it a few times in main().
While i was at it i fixed another race that'll probably never happen, but what the hey. Make sure the kernel args are copied into kernel space by the main cpu before letting any other ones use it.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20269 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Travis Geiselbrecht
2007-03-01 08:09:28 +00:00
parent 8d7966617a
commit 0098867364
4 changed files with 45 additions and 39 deletions
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headers/private/kernel/smp.h
+1 -1
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@@ -42,7 +42,7 @@ status_t smp_init(struct kernel_args *args);
status_t smp_per_cpu_init(struct kernel_args *args, int32 cpu);
bool smp_trap_non_boot_cpus(int32 cpu);
void smp_wake_up_non_boot_cpus(void);
void smp_wait_for_non_boot_cpus(void);
void smp_cpu_rendezvous(volatile uint32 *var, int current_cpu);
void smp_send_ici(int32 targetCPU, int32 message, uint32 data, uint32 data2, uint32 data3,
void *data_ptr, uint32 flags);
void smp_send_broadcast_ici(int32 message, uint32 data, uint32 data2, uint32 data3,