- 根目录:
- arch
- s390
- include
- asm
- percpu.h
#ifndef __ARCH_S390_PERCPU__
#define __ARCH_S390_PERCPU__
#include <linux/preempt.h>
#include <asm/cmpxchg.h>
/*
* s390 uses its own implementation for per cpu data, the offset of
* the cpu local data area is cached in the cpu's lowcore memory.
*/
#define __my_cpu_offset S390_lowcore.percpu_offset
#ifdef CONFIG_64BIT
/*
* For 64 bit module code, the module may be more than 4G above the
* per cpu area, use weak definitions to force the compiler to
* generate external references.
*/
#if defined(CONFIG_SMP) && defined(MODULE)
#define ARCH_NEEDS_WEAK_PER_CPU
#endif
/*
* We use a compare-and-swap loop since that uses less cpu cycles than
* disabling and enabling interrupts like the generic variant would do.
*/
#define arch_this_cpu_to_op_simple(pcp, val, op) \
({ \
typedef typeof(pcp) pcp_op_T__; \
pcp_op_T__ old__, new__, prev__; \
pcp_op_T__ *ptr__; \
preempt_disable(); \
ptr__ = __this_cpu_ptr(&(pcp)); \
prev__ = *ptr__; \
do { \
old__ = prev__; \
new__ = old__ op (val); \
prev__ = cmpxchg(ptr__, old__, new__); \
} while (prev__ != old__); \
preempt_enable(); \
new__; \
})
#define this_cpu_add_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
#define this_cpu_add_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
#define this_cpu_add_return_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
#define this_cpu_add_return_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
#define this_cpu_and_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
#define this_cpu_and_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
#define this_cpu_or_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
#define this_cpu_or_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
#ifndef CONFIG_HAVE_MARCH_Z196_FEATURES
#define this_cpu_add_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
#define this_cpu_add_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
#define this_cpu_add_return_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
#define this_cpu_add_return_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
#define this_cpu_and_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
#define this_cpu_and_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
#define this_cpu_or_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
#define this_cpu_or_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
#else /* CONFIG_HAVE_MARCH_Z196_FEATURES */
#define arch_this_cpu_add(pcp, val, op1, op2, szcast) \
{ \
typedef typeof(pcp) pcp_op_T__; \
pcp_op_T__ val__ = (val); \
pcp_op_T__ old__, *ptr__; \
preempt_disable(); \
ptr__ = __this_cpu_ptr(&(pcp)); \
if (__builtin_constant_p(val__) && \
((szcast)val__ > -129) && ((szcast)val__ < 128)) { \
asm volatile( \
op2 " %[ptr__],%[val__]\n" \
: [ptr__] "+Q" (*ptr__) \
: [val__] "i" ((szcast)val__) \
: "cc"); \
} else { \
asm volatile( \
op1 " %[old__],%[val__],%[ptr__]\n" \
: [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
: [val__] "d" (val__) \
: "cc"); \
} \
preempt_enable(); \
}
#define this_cpu_add_4(pcp, val) arch_this_cpu_add(pcp, val, "laa", "asi", int)
#define this_cpu_add_8(pcp, val) arch_this_cpu_add(pcp, val, "laag", "agsi", long)
#define arch_this_cpu_add_return(pcp, val, op) \
({ \
typedef typeof(pcp) pcp_op_T__; \
pcp_op_T__ val__ = (val); \
pcp_op_T__ old__, *ptr__; \
preempt_disable(); \
ptr__ = __this_cpu_ptr(&(pcp)); \
asm volatile( \
op " %[old__],%[val__],%[ptr__]\n" \
: [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
: [val__] "d" (val__) \
: "cc"); \
preempt_enable(); \
old__ + val__; \
})
#define this_cpu_add_return_4(pcp, val) arch_this_cpu_add_return(pcp, val, "laa")
#define this_cpu_add_return_8(pcp, val) arch_this_cpu_add_return(pcp, val, "laag")
#define arch_this_cpu_to_op(pcp, val, op) \
{ \
typedef typeof(pcp) pcp_op_T__; \
pcp_op_T__ val__ = (val); \
pcp_op_T__ old__, *ptr__; \
preempt_disable(); \
ptr__ = __this_cpu_ptr(&(pcp)); \
asm volatile( \
op " %[old__],%[val__],%[ptr__]\n" \
: [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
: [val__] "d" (val__) \
: "cc"); \
preempt_enable(); \
}
#define this_cpu_and_4(pcp, val) arch_this_cpu_to_op(pcp, val, "lan")
#define this_cpu_and_8(pcp, val) arch_this_cpu_to_op(pcp, val, "lang")
#define this_cpu_or_4(pcp, val) arch_this_cpu_to_op(pcp, val, "lao")
#define this_cpu_or_8(pcp, val) arch_this_cpu_to_op(pcp, val, "laog")
#endif /* CONFIG_HAVE_MARCH_Z196_FEATURES */
#define arch_this_cpu_cmpxchg(pcp, oval, nval) \
({ \
typedef typeof(pcp) pcp_op_T__; \
pcp_op_T__ ret__; \
pcp_op_T__ *ptr__; \
preempt_disable(); \
ptr__ = __this_cpu_ptr(&(pcp)); \
ret__ = cmpxchg(ptr__, oval, nval); \
preempt_enable(); \
ret__; \
})
#define this_cpu_cmpxchg_1(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
#define this_cpu_cmpxchg_2(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
#define this_cpu_cmpxchg_4(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
#define this_cpu_cmpxchg_8(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
#define arch_this_cpu_xchg(pcp, nval) \
({ \
typeof(pcp) *ptr__; \
typeof(pcp) ret__; \
preempt_disable(); \
ptr__ = __this_cpu_ptr(&(pcp)); \
ret__ = xchg(ptr__, nval); \
preempt_enable(); \
ret__; \
})
#define this_cpu_xchg_1(pcp, nval) arch_this_cpu_xchg(pcp, nval)
#define this_cpu_xchg_2(pcp, nval) arch_this_cpu_xchg(pcp, nval)
#define this_cpu_xchg_4(pcp, nval) arch_this_cpu_xchg(pcp, nval)
#define this_cpu_xchg_8(pcp, nval) arch_this_cpu_xchg(pcp, nval)
#define arch_this_cpu_cmpxchg_double(pcp1, pcp2, o1, o2, n1, n2) \
({ \
typeof(pcp1) o1__ = (o1), n1__ = (n1); \
typeof(pcp2) o2__ = (o2), n2__ = (n2); \
typeof(pcp1) *p1__; \
typeof(pcp2) *p2__; \
int ret__; \
preempt_disable(); \
p1__ = __this_cpu_ptr(&(pcp1)); \
p2__ = __this_cpu_ptr(&(pcp2)); \
ret__ = __cmpxchg_double(p1__, p2__, o1__, o2__, n1__, n2__); \
preempt_enable(); \
ret__; \
})
#define this_cpu_cmpxchg_double_4 arch_this_cpu_cmpxchg_double
#define this_cpu_cmpxchg_double_8 arch_this_cpu_cmpxchg_double
#endif /* CONFIG_64BIT */
#include <asm-generic/percpu.h>
#endif /* __ARCH_S390_PERCPU__ */