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-rw-r--r--arch/hexagon/include/asm/atomic.h203
1 files changed, 85 insertions, 118 deletions
diff --git a/arch/hexagon/include/asm/atomic.h b/arch/hexagon/include/asm/atomic.h
index 8a64ff2337f6..2447d083c432 100644
--- a/arch/hexagon/include/asm/atomic.h
+++ b/arch/hexagon/include/asm/atomic.h
@@ -1,22 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Atomic operations for the Hexagon architecture
*
* Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
- *
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 and
- * only version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
*/
#ifndef _ASM_ATOMIC_H
@@ -24,109 +10,103 @@
#include <linux/types.h>
#include <asm/cmpxchg.h>
+#include <asm/barrier.h>
-#define ATOMIC_INIT(i) { (i) }
-#define atomic_set(v, i) ((v)->counter = (i))
-
-/**
- * atomic_read - reads a word, atomically
- * @v: pointer to atomic value
- *
- * Assumes all word reads on our architecture are atomic.
- */
-#define atomic_read(v) ((v)->counter)
-
-/**
- * atomic_xchg - atomic
- * @v: pointer to memory to change
- * @new: new value (technically passed in a register -- see xchg)
- */
-#define atomic_xchg(v, new) (xchg(&((v)->counter), (new)))
-
+/* Normal writes in our arch don't clear lock reservations */
-/**
- * atomic_cmpxchg - atomic compare-and-exchange values
- * @v: pointer to value to change
- * @old: desired old value to match
- * @new: new value to put in
- *
- * Parameters are then pointer, value-in-register, value-in-register,
- * and the output is the old value.
- *
- * Apparently this is complicated for archs that don't support
- * the memw_locked like we do (or it's broken or whatever).
- *
- * Kind of the lynchpin of the rest of the generically defined routines.
- * Remember V2 had that bug with dotnew predicate set by memw_locked.
- *
- * "old" is "expected" old val, __oldval is actual old value
- */
-static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
+static inline void arch_atomic_set(atomic_t *v, int new)
{
- int __oldval;
-
asm volatile(
- "1: %0 = memw_locked(%1);\n"
- " { P0 = cmp.eq(%0,%2);\n"
- " if (!P0.new) jump:nt 2f; }\n"
- " memw_locked(%1,P0) = %3;\n"
+ "1: r6 = memw_locked(%0);\n"
+ " memw_locked(%0,p0) = %1;\n"
" if (!P0) jump 1b;\n"
- "2:\n"
- : "=&r" (__oldval)
- : "r" (&v->counter), "r" (old), "r" (new)
- : "memory", "p0"
+ :
+ : "r" (&v->counter), "r" (new)
+ : "memory", "p0", "r6"
);
-
- return __oldval;
}
-static inline int atomic_add_return(int i, atomic_t *v)
-{
- int output;
-
- __asm__ __volatile__ (
- "1: %0 = memw_locked(%1);\n"
- " %0 = add(%0,%2);\n"
- " memw_locked(%1,P3)=%0;\n"
- " if !P3 jump 1b;\n"
- : "=&r" (output)
- : "r" (&v->counter), "r" (i)
- : "memory", "p3"
- );
- return output;
+#define arch_atomic_set_release(v, i) arch_atomic_set((v), (i))
+
+#define arch_atomic_read(v) READ_ONCE((v)->counter)
+
+#define ATOMIC_OP(op) \
+static inline void arch_atomic_##op(int i, atomic_t *v) \
+{ \
+ int output; \
+ \
+ __asm__ __volatile__ ( \
+ "1: %0 = memw_locked(%1);\n" \
+ " %0 = "#op "(%0,%2);\n" \
+ " memw_locked(%1,P3)=%0;\n" \
+ " if (!P3) jump 1b;\n" \
+ : "=&r" (output) \
+ : "r" (&v->counter), "r" (i) \
+ : "memory", "p3" \
+ ); \
+} \
+
+#define ATOMIC_OP_RETURN(op) \
+static inline int arch_atomic_##op##_return(int i, atomic_t *v) \
+{ \
+ int output; \
+ \
+ __asm__ __volatile__ ( \
+ "1: %0 = memw_locked(%1);\n" \
+ " %0 = "#op "(%0,%2);\n" \
+ " memw_locked(%1,P3)=%0;\n" \
+ " if (!P3) jump 1b;\n" \
+ : "=&r" (output) \
+ : "r" (&v->counter), "r" (i) \
+ : "memory", "p3" \
+ ); \
+ return output; \
+}
+#define ATOMIC_FETCH_OP(op) \
+static inline int arch_atomic_fetch_##op(int i, atomic_t *v) \
+{ \
+ int output, val; \
+ \
+ __asm__ __volatile__ ( \
+ "1: %0 = memw_locked(%2);\n" \
+ " %1 = "#op "(%0,%3);\n" \
+ " memw_locked(%2,P3)=%1;\n" \
+ " if (!P3) jump 1b;\n" \
+ : "=&r" (output), "=&r" (val) \
+ : "r" (&v->counter), "r" (i) \
+ : "memory", "p3" \
+ ); \
+ return output; \
}
-#define atomic_add(i, v) atomic_add_return(i, (v))
+#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op)
-static inline int atomic_sub_return(int i, atomic_t *v)
-{
- int output;
- __asm__ __volatile__ (
- "1: %0 = memw_locked(%1);\n"
- " %0 = sub(%0,%2);\n"
- " memw_locked(%1,P3)=%0\n"
- " if !P3 jump 1b;\n"
- : "=&r" (output)
- : "r" (&v->counter), "r" (i)
- : "memory", "p3"
- );
- return output;
-}
+ATOMIC_OPS(add)
+ATOMIC_OPS(sub)
-#define atomic_sub(i, v) atomic_sub_return(i, (v))
+#define arch_atomic_add_return arch_atomic_add_return
+#define arch_atomic_sub_return arch_atomic_sub_return
+#define arch_atomic_fetch_add arch_atomic_fetch_add
+#define arch_atomic_fetch_sub arch_atomic_fetch_sub
-/**
- * __atomic_add_unless - add unless the number is a given value
- * @v: pointer to value
- * @a: amount to add
- * @u: unless value is equal to u
- *
- * Returns old value.
- *
- */
+#undef ATOMIC_OPS
+#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op)
+
+ATOMIC_OPS(and)
+ATOMIC_OPS(or)
+ATOMIC_OPS(xor)
+
+#define arch_atomic_fetch_and arch_atomic_fetch_and
+#define arch_atomic_fetch_or arch_atomic_fetch_or
+#define arch_atomic_fetch_xor arch_atomic_fetch_xor
-static inline int __atomic_add_unless(atomic_t *v, int a, int u)
+#undef ATOMIC_OPS
+#undef ATOMIC_FETCH_OP
+#undef ATOMIC_OP_RETURN
+#undef ATOMIC_OP
+
+static inline int arch_atomic_fetch_add_unless(atomic_t *v, int a, int u)
{
int __oldval;
register int tmp;
@@ -140,7 +120,7 @@ static inline int __atomic_add_unless(atomic_t *v, int a, int u)
" }"
" memw_locked(%2, p3) = %1;"
" {"
- " if !p3 jump 1b;"
+ " if (!p3) jump 1b;"
" }"
"2:"
: "=&r" (__oldval), "=&r" (tmp)
@@ -149,19 +129,6 @@ static inline int __atomic_add_unless(atomic_t *v, int a, int u)
);
return __oldval;
}
-
-#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
-
-#define atomic_inc(v) atomic_add(1, (v))
-#define atomic_dec(v) atomic_sub(1, (v))
-
-#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
-#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
-#define atomic_sub_and_test(i, v) (atomic_sub_return(i, (v)) == 0)
-#define atomic_add_negative(i, v) (atomic_add_return(i, (v)) < 0)
-
-
-#define atomic_inc_return(v) (atomic_add_return(1, v))
-#define atomic_dec_return(v) (atomic_sub_return(1, v))
+#define arch_atomic_fetch_add_unless arch_atomic_fetch_add_unless
#endif
generated by cgit (git 2.34.1) at 2025-12-25 12:13:57 +0000