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Optimized (yes, we shouldn't do it now) to consume less power on P4,

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and to have better performance on Hyper Threading systems. Should be
backward compatible with all x86 systems, according to Intel documentation.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2068 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
beveloper 2002-11-23 17:43:36 +00:00
parent f7081347c5
commit d8dd74308e
1 changed files with 19 additions and 7 deletions
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26
src/kernel/core/smp.c
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@ -26,6 +26,12 @@
#define DEBUG_SPINLOCKS 1
#if __INTEL__
#define PAUSE() asm volatile ("rep; nop;")
#else
#define PAUSE()
#endif
#define MSG_POOL_SIZE (SMP_MAX_CPUS * 4)
struct smp_msg {
@ -71,8 +77,10 @@ acquire_spinlock(spinlock *lock)
if (are_interrupts_enabled())
panic("acquire_spinlock: attempt to acquire lock %p with interrupts enabled\n", lock);
while (1) {
while (*lock != 0)
while (*lock != 0) {
smp_process_pending_ici(curr_cpu);
PAUSE();
}
if (atomic_set((int32 *)lock, 1) == 0)
break;
}
@ -85,7 +93,7 @@ acquire_spinlock(spinlock *lock)
#endif
}
}
static void
acquire_spinlock_nocheck(spinlock *lock)
@ -97,7 +105,7 @@ acquire_spinlock_nocheck(spinlock *lock)
#endif
while (1) {
while(*lock != 0)
;
PAUSE();
if (atomic_set((int32 *)lock, 1) == 0)
break;
}
@ -143,8 +151,8 @@ find_free_message(struct smp_msg **msg)
// dprintf("find_free_message: entry\n");
retry:
while(free_msg_count <= 0)
;
while (free_msg_count <= 0)
PAUSE();
state = disable_interrupts();
acquire_spinlock(&free_msg_spinlock);
@ -394,8 +402,10 @@ smp_send_ici(int target_cpu, int message, unsigned long data, unsigned long data
// wait for the other cpu to finish processing it
// the interrupt handler will ref count it to <0
// if the message is sync after it has removed it from the mailbox
while (msg->done == false)
while (msg->done == false) {
smp_process_pending_ici(curr_cpu);
PAUSE();
}
// for SYNC messages, it's our responsibility to put it
// back into the free list
return_free_message(msg);
@ -450,8 +460,10 @@ smp_send_broadcast_ici(int message, unsigned long data, unsigned long data2, uns
// the interrupt handler will ref count it to <0
// if the message is sync after it has removed it from the mailbox
// dprintf("smp_send_broadcast_ici: waiting for ack\n");
while (msg->done == false)
while (msg->done == false) {
smp_process_pending_ici(curr_cpu);
PAUSE();
}
// dprintf("smp_send_broadcast_ici: returning message to free list\n");
// for SYNC messages, it's our responsibility to put it
// back into the free list