| 1,5 → 1,5 |
|---|
| /* |
| * Copyright (c) 2005 Ondrej Palkovsky |
| * Copyright (c) 2007 Michal Kebrt |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| 29,34 → 29,99 |
|---|
| /** @addtogroup arm32 |
| * @{ |
| */ |
| /** @file |
| /** @file |
| * @brief Atomic operations. |
| */ |
| |
| #ifndef KERN_arm32_ATOMIC_H_ |
| #define KERN_arm32_ATOMIC_H_ |
| |
| #define atomic_inc(x) ((void) atomic_add(x, 1)) |
| #define atomic_dec(x) ((void) atomic_add(x, -1)) |
| /** Atomic addition. |
| * |
| * @param val Where to add. |
| * @param i Value to be added. |
| * |
| * @return Value after addition. |
| */ |
| static inline long atomic_add(atomic_t *val, int i) |
| { |
| int ret; |
| volatile long *mem = &(val->count); |
| |
| #define atomic_postinc(x) (atomic_add(x, 1) - 1) |
| #define atomic_postdec(x) (atomic_add(x, -1) + 1) |
| asm volatile ( |
| "1:\n" |
| "ldr r2, [%1] \n" |
| "add r3, r2, %2 \n" |
| "str r3, %0 \n" |
| "swp r3, r3, [%1] \n" |
| "cmp r3, r2 \n" |
| "bne 1b \n" |
| |
| #define atomic_preinc(x) atomic_add(x, 1) |
| #define atomic_predec(x) atomic_add(x, -1) |
| : "=m" (ret) |
| : "r" (mem), "r" (i) |
| : "r3", "r2" |
| ); |
| |
| /* Atomic addition of immediate value. |
| return ret; |
| } |
| |
| /** Atomic increment. |
| * |
| * @param val Memory location to which will be the immediate value added. |
| * @param i Signed immediate that will be added to *val. |
| * @param val Variable to be incremented. |
| */ |
| static inline void atomic_inc(atomic_t *val) |
| { |
| atomic_add(val, 1); |
| } |
| |
| /** Atomic decrement. |
| * |
| * @return Value after addition. |
| * @param val Variable to be decremented. |
| */ |
| static inline long atomic_add(atomic_t *val, int i) |
| static inline void atomic_dec(atomic_t *val) { |
| atomic_add(val, -1); |
| } |
| |
| /** Atomic pre-increment. |
| * |
| * @param val Variable to be incremented. |
| * @return Value after incrementation. |
| */ |
| static inline long atomic_preinc(atomic_t *val) |
| { |
| /* TODO */ |
| return (val->count += i); |
| return atomic_add(val, 1); |
| } |
| |
| /** Atomic pre-decrement. |
| * |
| * @param val Variable to be decremented. |
| * @return Value after decrementation. |
| */ |
| static inline long atomic_predec(atomic_t *val) |
| { |
| return atomic_add(val, -1); |
| } |
| |
| /** Atomic post-increment. |
| * |
| * @param val Variable to be incremented. |
| * @return Value before incrementation. |
| */ |
| static inline long atomic_postinc(atomic_t *val) |
| { |
| return atomic_add(val, 1) - 1; |
| } |
| |
| /** Atomic post-decrement. |
| * |
| * @param val Variable to be decremented. |
| * @return Value before decrementation. |
| */ |
| static inline long atomic_postdec(atomic_t *val) |
| { |
| return atomic_add(val, -1) + 1; |
| } |
| |
| #endif |
| |
| /** @} |