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

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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24
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;
}
@ -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