cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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local.h (3258B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _ARCH_POWERPC_LOCAL_H
      3#define _ARCH_POWERPC_LOCAL_H
      4
      5#ifdef CONFIG_PPC_BOOK3S_64
      6
      7#include <linux/percpu.h>
      8#include <linux/atomic.h>
      9#include <linux/irqflags.h>
     10
     11#include <asm/hw_irq.h>
     12
     13typedef struct
     14{
     15	long v;
     16} local_t;
     17
     18#define LOCAL_INIT(i)	{ (i) }
     19
     20static __inline__ long local_read(const local_t *l)
     21{
     22	return READ_ONCE(l->v);
     23}
     24
     25static __inline__ void local_set(local_t *l, long i)
     26{
     27	WRITE_ONCE(l->v, i);
     28}
     29
     30#define LOCAL_OP(op, c_op)						\
     31static __inline__ void local_##op(long i, local_t *l)			\
     32{									\
     33	unsigned long flags;						\
     34									\
     35	powerpc_local_irq_pmu_save(flags);				\
     36	l->v c_op i;						\
     37	powerpc_local_irq_pmu_restore(flags);				\
     38}
     39
     40#define LOCAL_OP_RETURN(op, c_op)					\
     41static __inline__ long local_##op##_return(long a, local_t *l)		\
     42{									\
     43	long t;								\
     44	unsigned long flags;						\
     45									\
     46	powerpc_local_irq_pmu_save(flags);				\
     47	t = (l->v c_op a);						\
     48	powerpc_local_irq_pmu_restore(flags);				\
     49									\
     50	return t;							\
     51}
     52
     53#define LOCAL_OPS(op, c_op)		\
     54	LOCAL_OP(op, c_op)		\
     55	LOCAL_OP_RETURN(op, c_op)
     56
     57LOCAL_OPS(add, +=)
     58LOCAL_OPS(sub, -=)
     59
     60#define local_add_negative(a, l)	(local_add_return((a), (l)) < 0)
     61#define local_inc_return(l)		local_add_return(1LL, l)
     62#define local_inc(l)			local_inc_return(l)
     63
     64/*
     65 * local_inc_and_test - increment and test
     66 * @l: pointer of type local_t
     67 *
     68 * Atomically increments @l by 1
     69 * and returns true if the result is zero, or false for all
     70 * other cases.
     71 */
     72#define local_inc_and_test(l)		(local_inc_return(l) == 0)
     73
     74#define local_dec_return(l)		local_sub_return(1LL, l)
     75#define local_dec(l)			local_dec_return(l)
     76#define local_sub_and_test(a, l)	(local_sub_return((a), (l)) == 0)
     77#define local_dec_and_test(l)		(local_dec_return((l)) == 0)
     78
     79static __inline__ long local_cmpxchg(local_t *l, long o, long n)
     80{
     81	long t;
     82	unsigned long flags;
     83
     84	powerpc_local_irq_pmu_save(flags);
     85	t = l->v;
     86	if (t == o)
     87		l->v = n;
     88	powerpc_local_irq_pmu_restore(flags);
     89
     90	return t;
     91}
     92
     93static __inline__ long local_xchg(local_t *l, long n)
     94{
     95	long t;
     96	unsigned long flags;
     97
     98	powerpc_local_irq_pmu_save(flags);
     99	t = l->v;
    100	l->v = n;
    101	powerpc_local_irq_pmu_restore(flags);
    102
    103	return t;
    104}
    105
    106/**
    107 * local_add_unless - add unless the number is a given value
    108 * @l: pointer of type local_t
    109 * @a: the amount to add to v...
    110 * @u: ...unless v is equal to u.
    111 *
    112 * Atomically adds @a to @l, so long as it was not @u.
    113 * Returns non-zero if @l was not @u, and zero otherwise.
    114 */
    115static __inline__ int local_add_unless(local_t *l, long a, long u)
    116{
    117	unsigned long flags;
    118	int ret = 0;
    119
    120	powerpc_local_irq_pmu_save(flags);
    121	if (l->v != u) {
    122		l->v += a;
    123		ret = 1;
    124	}
    125	powerpc_local_irq_pmu_restore(flags);
    126
    127	return ret;
    128}
    129
    130#define local_inc_not_zero(l)		local_add_unless((l), 1, 0)
    131
    132/* Use these for per-cpu local_t variables: on some archs they are
    133 * much more efficient than these naive implementations.  Note they take
    134 * a variable, not an address.
    135 */
    136
    137#define __local_inc(l)		((l)->v++)
    138#define __local_dec(l)		((l)->v++)
    139#define __local_add(i,l)	((l)->v+=(i))
    140#define __local_sub(i,l)	((l)->v-=(i))
    141
    142#else /* CONFIG_PPC64 */
    143
    144#include <asm-generic/local.h>
    145
    146#endif /* CONFIG_PPC64 */
    147
    148#endif /* _ARCH_POWERPC_LOCAL_H */