зеркало из https://github.com/mozilla/gecko-dev.git
34 строки
1.1 KiB
Plaintext
34 строки
1.1 KiB
Plaintext
/*
|
|
* @(#)sparc.gcc 10.1 (Sleepycat) 4/12/97
|
|
*
|
|
* The ldstub instruction takes the location specified by its first argument
|
|
* (a register containing a memory address) and loads its contents into its
|
|
* second argument (a register) and atomically sets the contents the location
|
|
* specified by its first argument to a byte of 1s. (The value in the second
|
|
* argument is never read, but only overwritten.)
|
|
*
|
|
* The membar instructions are needed to ensure that writes to the lock are
|
|
* correctly ordered with writes that occur later in the instruction stream.
|
|
*
|
|
* For gcc/sparc, 0 is clear, 1 is set.
|
|
*/
|
|
|
|
#if defined(__sparcv9__)
|
|
Does the following code need membar instructions for V9 processors?
|
|
#endif
|
|
|
|
#define TSL_SET(tsl) ({ \
|
|
register tsl_t *__l = (tsl); \
|
|
register tsl_t __r; \
|
|
__asm__ volatile \
|
|
("ldstub [%1],%0" \
|
|
: "=r"( __r) : "r" (__l)); \
|
|
!__r; \
|
|
})
|
|
|
|
#define TSL_UNSET(tsl) ({ \
|
|
register tsl_t *__l = (tsl); \
|
|
__asm__ volatile ("stb %%g0,[%0]" : : "r" (__l)); \
|
|
})
|
|
#define TSL_INIT(tsl) TSL_UNSET(tsl)
|