forked from rrcarlosr/Jetpack
129 lines
3.4 KiB
C
129 lines
3.4 KiB
C
/*
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* Copyright (c) 2016-2017, NVIDIA CORPORATION. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef UTILITY_H
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#define UTILITY_H
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#include <linux/printk.h>
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#include <stdbool.h>
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#define assert(x) \
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do { \
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if (!(x)) { \
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pr_err_once("assertion failed %s: %d: %s\n", \
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__FILE__, __LINE__, #x); \
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} \
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} while (0)
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#define GET_TOP32(x) ((x) >> 32ULL)
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#define SET_TOP32(x) ((x) << 32ULL)
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#define GET_LOW32(x) ((x) & 0x00000000FFFFFFFFULL)
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#define SET_LOW32(x) ((x) & 0x00000000FFFFFFFFULL)
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static inline void write_barrier(void)
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{
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#if defined(__aarch64__)
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asm volatile("dmb ishst" ::: "memory");
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#elif defined(__arm__)
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asm volatile("dmb" ::: "memory");
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#elif defined(__x86_64__)
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asm volatile("" ::: "memory");
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#else
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assert(false);
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#endif
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}
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static inline void read_barrier(void)
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{
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#if defined(__aarch64__)
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asm volatile("dmb ishld" ::: "memory");
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#elif defined(__arm__)
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asm volatile("dmb" ::: "memory");
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#elif defined(__x86_64__)
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asm volatile("" ::: "memory");
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#else
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assert(false);
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#endif
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}
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static inline uint64_t read64(volatile uint64_t *addr)
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{
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uint64_t value;
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#if defined(USE_GNU_ATOMICS_64)
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value = __sync_fetch_and_add(addr, 0ULL);
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#elif (defined(__aarch64__) || defined(__x86_64__))
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assert(((uintptr_t)addr & (sizeof(uint64_t) - 1)) == 0);
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value = *addr;
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#elif defined(__arm__)
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register uint32_t r2 asm("r2");
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register uint32_t r3 asm("r3");
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assert(((uintptr_t)addr & (sizeof(uint64_t) - 1)) == 0);
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asm volatile("ldrd %0, %1, [%2]"
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: "=r"(r2), "=r"(r3) : "r"(addr) : );
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value = ((uint64_t)r2 | ((uint64_t)r3 << 32));
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#else
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assert(false);
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value = 0;
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#endif
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return value;
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}
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static inline void write64(volatile uint64_t *addr, uint64_t value)
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{
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#if defined(USE_GNU_ATOMICS_64)
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uint64_t prev;
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while (1) {
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prev = __sync_fetch_and_add(addr, 0ULL);
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if (__sync_bool_compare_and_swap(addr, prev, value) == true)
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break;
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}
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#elif (defined(__aarch64__) || defined(__x86_64__))
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assert(((uintptr_t)addr & (sizeof(uint64_t) - 1)) == 0);
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*addr = value;
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#elif defined(__arm__)
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register uint32_t r2 asm("r2") = (uint32_t)value;
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register uint32_t r3 asm("r3") = (uint32_t)(value >> 32);
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assert(((uintptr_t)addr & (sizeof(uint64_t) - 1)) == 0);
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asm volatile("strd %0, %1, [%2]"
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: : "r"(r2), "r"(r3), "r"(addr) : "memory");
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#else
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assert(false);
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#endif
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}
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static inline uint64_t increment64(volatile uint64_t *addr)
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{
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uint64_t prev;
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prev = read64(addr);
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write64(addr, prev + 1);
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return prev;
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}
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#endif
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