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 (2282B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _ASM_GENERIC_LOCAL_H
      3#define _ASM_GENERIC_LOCAL_H
      4
      5#include <linux/percpu.h>
      6#include <linux/atomic.h>
      7#include <asm/types.h>
      8
      9/*
     10 * A signed long type for operations which are atomic for a single CPU.
     11 * Usually used in combination with per-cpu variables.
     12 *
     13 * This is the default implementation, which uses atomic_long_t.  Which is
     14 * rather pointless.  The whole point behind local_t is that some processors
     15 * can perform atomic adds and subtracts in a manner which is atomic wrt IRQs
     16 * running on this CPU.  local_t allows exploitation of such capabilities.
     17 */
     18
     19/* Implement in terms of atomics. */
     20
     21/* Don't use typedef: don't want them to be mixed with atomic_t's. */
     22typedef struct
     23{
     24	atomic_long_t a;
     25} local_t;
     26
     27#define LOCAL_INIT(i)	{ ATOMIC_LONG_INIT(i) }
     28
     29#define local_read(l)	atomic_long_read(&(l)->a)
     30#define local_set(l,i)	atomic_long_set((&(l)->a),(i))
     31#define local_inc(l)	atomic_long_inc(&(l)->a)
     32#define local_dec(l)	atomic_long_dec(&(l)->a)
     33#define local_add(i,l)	atomic_long_add((i),(&(l)->a))
     34#define local_sub(i,l)	atomic_long_sub((i),(&(l)->a))
     35
     36#define local_sub_and_test(i, l) atomic_long_sub_and_test((i), (&(l)->a))
     37#define local_dec_and_test(l) atomic_long_dec_and_test(&(l)->a)
     38#define local_inc_and_test(l) atomic_long_inc_and_test(&(l)->a)
     39#define local_add_negative(i, l) atomic_long_add_negative((i), (&(l)->a))
     40#define local_add_return(i, l) atomic_long_add_return((i), (&(l)->a))
     41#define local_sub_return(i, l) atomic_long_sub_return((i), (&(l)->a))
     42#define local_inc_return(l) atomic_long_inc_return(&(l)->a)
     43
     44#define local_cmpxchg(l, o, n) atomic_long_cmpxchg((&(l)->a), (o), (n))
     45#define local_xchg(l, n) atomic_long_xchg((&(l)->a), (n))
     46#define local_add_unless(l, _a, u) atomic_long_add_unless((&(l)->a), (_a), (u))
     47#define local_inc_not_zero(l) atomic_long_inc_not_zero(&(l)->a)
     48
     49/* Non-atomic variants, ie. preemption disabled and won't be touched
     50 * in interrupt, etc.  Some archs can optimize this case well. */
     51#define __local_inc(l)		local_set((l), local_read(l) + 1)
     52#define __local_dec(l)		local_set((l), local_read(l) - 1)
     53#define __local_add(i,l)	local_set((l), local_read(l) + (i))
     54#define __local_sub(i,l)	local_set((l), local_read(l) - (i))
     55
     56#endif /* _ASM_GENERIC_LOCAL_H */