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/* locks.S: Wheee... I'm coding Intel assembly...
*
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
*/
#include <linux/linkage.h>
/* Caller does atomic increment on current->lock_depth,
* if it was found to originally be zero then we get here,
* %eax contains callers PC and %edx holds this cpu ID.
*/
ENTRY(__lock_kernel)
1:
lock
btsl $0, SYMBOL_NAME(kernel_flag)
jnc 3f
sti
2:
btl %dl, SYMBOL_NAME(smp_invalidate_needed)
jnc 0f
lock
btrl %dl, SYMBOL_NAME(smp_invalidate_needed)
jnc 0f
pushl %eax
movl %cr3, %eax
movl %eax, %cr3
popl %eax
0:
btl $0, SYMBOL_NAME(kernel_flag)
jc 2b
cli
jmp 1b
3:
movb %dl, SYMBOL_NAME(active_kernel_processor)
ret
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