mirror of
https://github.com/zephyrproject-rtos/zephyr
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c315475bb0
Consistently place C++ use of extern "C" after all include directives, within the negative branch of _ASMLANGUAGE if used. Background from issue #17997: Declarations that use C linkage should be placed within extern "C" so the language linkage is correct when the header is included by a C++ compiler. Similarly #include directives should be outside the extern "C" to ensure the language-specific default linkage is applied to any declarations provided by the included header. See: https://en.cppreference.com/w/cpp/language/language_linkage Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
149 lines
2.8 KiB
C
149 lines
2.8 KiB
C
/*
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* Copyright (c) 2015, Wind River Systems, Inc.
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* Copyright (c) 2017, Oticon A/S
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/* "Arch" bit manipulation functions in non-arch-specific C code (uses some
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* gcc builtins)
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*/
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#ifndef ZEPHYR_INCLUDE_ARCH_COMMON_SYS_IO_H_
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#define ZEPHYR_INCLUDE_ARCH_COMMON_SYS_IO_H_
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#ifndef _ASMLANGUAGE
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#include <zephyr/types.h>
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#include <sys/sys_io.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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static ALWAYS_INLINE u8_t sys_read8(mem_addr_t addr)
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{
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return *(volatile u8_t *)addr;
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}
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static ALWAYS_INLINE void sys_write8(u8_t data, mem_addr_t addr)
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{
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*(volatile u8_t *)addr = data;
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}
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static ALWAYS_INLINE u16_t sys_read16(mem_addr_t addr)
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{
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return *(volatile u16_t *)addr;
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}
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static ALWAYS_INLINE void sys_write16(u16_t data, mem_addr_t addr)
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{
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*(volatile u16_t *)addr = data;
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}
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static ALWAYS_INLINE u32_t sys_read32(mem_addr_t addr)
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{
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return *(volatile u32_t *)addr;
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}
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static ALWAYS_INLINE void sys_write32(u32_t data, mem_addr_t addr)
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{
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*(volatile u32_t *)addr = data;
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}
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/* Memory bit manipulation functions */
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static ALWAYS_INLINE void sys_set_bit(mem_addr_t addr, unsigned int bit)
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{
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u32_t temp = *(volatile u32_t *)addr;
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*(volatile u32_t *)addr = temp | (1 << bit);
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}
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static ALWAYS_INLINE void sys_clear_bit(mem_addr_t addr, unsigned int bit)
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{
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u32_t temp = *(volatile u32_t *)addr;
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*(volatile u32_t *)addr = temp & ~(1 << bit);
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}
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static ALWAYS_INLINE int sys_test_bit(mem_addr_t addr, unsigned int bit)
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{
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u32_t temp = *(volatile u32_t *)addr;
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return temp & (1 << bit);
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}
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static ALWAYS_INLINE
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void sys_bitfield_set_bit(mem_addr_t addr, unsigned int bit)
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{
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/* Doing memory offsets in terms of 32-bit values to prevent
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* alignment issues
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*/
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sys_set_bit(addr + ((bit >> 5) << 2), bit & 0x1F);
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}
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static ALWAYS_INLINE
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void sys_bitfield_clear_bit(mem_addr_t addr, unsigned int bit)
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{
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sys_clear_bit(addr + ((bit >> 5) << 2), bit & 0x1F);
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}
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static ALWAYS_INLINE
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int sys_bitfield_test_bit(mem_addr_t addr, unsigned int bit)
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{
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return sys_test_bit(addr + ((bit >> 5) << 2), bit & 0x1F);
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}
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static ALWAYS_INLINE
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int sys_test_and_set_bit(mem_addr_t addr, unsigned int bit)
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{
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int ret;
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ret = sys_test_bit(addr, bit);
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sys_set_bit(addr, bit);
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return ret;
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}
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static ALWAYS_INLINE
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int sys_test_and_clear_bit(mem_addr_t addr, unsigned int bit)
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{
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int ret;
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ret = sys_test_bit(addr, bit);
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sys_clear_bit(addr, bit);
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return ret;
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}
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static ALWAYS_INLINE
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int sys_bitfield_test_and_set_bit(mem_addr_t addr, unsigned int bit)
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{
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int ret;
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ret = sys_bitfield_test_bit(addr, bit);
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sys_bitfield_set_bit(addr, bit);
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return ret;
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}
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static ALWAYS_INLINE
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int sys_bitfield_test_and_clear_bit(mem_addr_t addr, unsigned int bit)
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{
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int ret;
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ret = sys_bitfield_test_bit(addr, bit);
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sys_bitfield_clear_bit(addr, bit);
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return ret;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ASMLANGUAGE */
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#endif /* ZEPHYR_INCLUDE_ARCH_COMMON_SYS_IO_H_ */
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