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 (3925B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _ASM_X86_LOCAL_H
      3#define _ASM_X86_LOCAL_H
      4
      5#include <linux/percpu.h>
      6
      7#include <linux/atomic.h>
      8#include <asm/asm.h>
      9
     10typedef struct {
     11	atomic_long_t a;
     12} local_t;
     13
     14#define LOCAL_INIT(i)	{ ATOMIC_LONG_INIT(i) }
     15
     16#define local_read(l)	atomic_long_read(&(l)->a)
     17#define local_set(l, i)	atomic_long_set(&(l)->a, (i))
     18
     19static inline void local_inc(local_t *l)
     20{
     21	asm volatile(_ASM_INC "%0"
     22		     : "+m" (l->a.counter));
     23}
     24
     25static inline void local_dec(local_t *l)
     26{
     27	asm volatile(_ASM_DEC "%0"
     28		     : "+m" (l->a.counter));
     29}
     30
     31static inline void local_add(long i, local_t *l)
     32{
     33	asm volatile(_ASM_ADD "%1,%0"
     34		     : "+m" (l->a.counter)
     35		     : "ir" (i));
     36}
     37
     38static inline void local_sub(long i, local_t *l)
     39{
     40	asm volatile(_ASM_SUB "%1,%0"
     41		     : "+m" (l->a.counter)
     42		     : "ir" (i));
     43}
     44
     45/**
     46 * local_sub_and_test - subtract value from variable and test result
     47 * @i: integer value to subtract
     48 * @l: pointer to type local_t
     49 *
     50 * Atomically subtracts @i from @l and returns
     51 * true if the result is zero, or false for all
     52 * other cases.
     53 */
     54static inline bool local_sub_and_test(long i, local_t *l)
     55{
     56	return GEN_BINARY_RMWcc(_ASM_SUB, l->a.counter, e, "er", i);
     57}
     58
     59/**
     60 * local_dec_and_test - decrement and test
     61 * @l: pointer to type local_t
     62 *
     63 * Atomically decrements @l by 1 and
     64 * returns true if the result is 0, or false for all other
     65 * cases.
     66 */
     67static inline bool local_dec_and_test(local_t *l)
     68{
     69	return GEN_UNARY_RMWcc(_ASM_DEC, l->a.counter, e);
     70}
     71
     72/**
     73 * local_inc_and_test - increment and test
     74 * @l: pointer to type local_t
     75 *
     76 * Atomically increments @l by 1
     77 * and returns true if the result is zero, or false for all
     78 * other cases.
     79 */
     80static inline bool local_inc_and_test(local_t *l)
     81{
     82	return GEN_UNARY_RMWcc(_ASM_INC, l->a.counter, e);
     83}
     84
     85/**
     86 * local_add_negative - add and test if negative
     87 * @i: integer value to add
     88 * @l: pointer to type local_t
     89 *
     90 * Atomically adds @i to @l and returns true
     91 * if the result is negative, or false when
     92 * result is greater than or equal to zero.
     93 */
     94static inline bool local_add_negative(long i, local_t *l)
     95{
     96	return GEN_BINARY_RMWcc(_ASM_ADD, l->a.counter, s, "er", i);
     97}
     98
     99/**
    100 * local_add_return - add and return
    101 * @i: integer value to add
    102 * @l: pointer to type local_t
    103 *
    104 * Atomically adds @i to @l and returns @i + @l
    105 */
    106static inline long local_add_return(long i, local_t *l)
    107{
    108	long __i = i;
    109	asm volatile(_ASM_XADD "%0, %1;"
    110		     : "+r" (i), "+m" (l->a.counter)
    111		     : : "memory");
    112	return i + __i;
    113}
    114
    115static inline long local_sub_return(long i, local_t *l)
    116{
    117	return local_add_return(-i, l);
    118}
    119
    120#define local_inc_return(l)  (local_add_return(1, l))
    121#define local_dec_return(l)  (local_sub_return(1, l))
    122
    123#define local_cmpxchg(l, o, n) \
    124	(cmpxchg_local(&((l)->a.counter), (o), (n)))
    125/* Always has a lock prefix */
    126#define local_xchg(l, n) (xchg(&((l)->a.counter), (n)))
    127
    128/**
    129 * local_add_unless - add unless the number is a given value
    130 * @l: pointer of type local_t
    131 * @a: the amount to add to l...
    132 * @u: ...unless l is equal to u.
    133 *
    134 * Atomically adds @a to @l, so long as it was not @u.
    135 * Returns non-zero if @l was not @u, and zero otherwise.
    136 */
    137#define local_add_unless(l, a, u)				\
    138({								\
    139	long c, old;						\
    140	c = local_read((l));					\
    141	for (;;) {						\
    142		if (unlikely(c == (u)))				\
    143			break;					\
    144		old = local_cmpxchg((l), c, c + (a));		\
    145		if (likely(old == c))				\
    146			break;					\
    147		c = old;					\
    148	}							\
    149	c != (u);						\
    150})
    151#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
    152
    153/* On x86_32, these are no better than the atomic variants.
    154 * On x86-64 these are better than the atomic variants on SMP kernels
    155 * because they dont use a lock prefix.
    156 */
    157#define __local_inc(l)		local_inc(l)
    158#define __local_dec(l)		local_dec(l)
    159#define __local_add(i, l)	local_add((i), (l))
    160#define __local_sub(i, l)	local_sub((i), (l))
    161
    162#endif /* _ASM_X86_LOCAL_H */