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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| // Copyright 2023 ETH Zurich and University of Bologna. | ||
| // Licensed under the Apache License, Version 2.0, see LICENSE for details. | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
| // | ||
| // Robert Balas <[email protected]> | ||
| // | ||
|
|
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| /* Description: Memory mapped register I/O access | ||
| */ | ||
|
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| #ifndef __IO_H | ||
| #define __IO_H | ||
|
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| #include <stdint.h> | ||
|
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|
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| /* generic I/O write */ | ||
| static inline void writeb(uint8_t val, uintptr_t addr) | ||
| { | ||
| asm volatile("sb %0, 0(%1)" | ||
| : | ||
| : "r"(val), "r"((volatile uint8_t *)addr) | ||
| : "memory"); | ||
| } | ||
|
|
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| static inline void writeh(uint16_t val, uintptr_t addr) | ||
| { | ||
| asm volatile("sh %0, 0(%1)" | ||
| : | ||
| : "r"(val), "r"((volatile uint16_t *)addr) | ||
| : "memory"); | ||
| } | ||
|
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| static inline void writew(uint32_t val, uintptr_t addr) | ||
| { | ||
| asm volatile("sw %0, 0(%1)" | ||
| : | ||
| : "r"(val), "r"((volatile uint32_t *)addr) | ||
| : "memory"); | ||
| } | ||
|
|
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| static inline void writed(uint64_t val, uintptr_t addr) | ||
| { | ||
| asm volatile("sd %0, 0(%1)" | ||
| : | ||
| : "r"(val), "r"((volatile uint64_t *)addr) | ||
| : "memory"); | ||
| } | ||
|
|
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| /* generic I/O read */ | ||
| static inline uint8_t readb(const uintptr_t addr) | ||
| { | ||
| uint8_t val; | ||
|
|
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| asm volatile("lb %0, 0(%1)" | ||
| : "=r"(val) | ||
| : "r"((const volatile uint8_t *)addr) | ||
| : "memory"); | ||
| return val; | ||
| } | ||
|
|
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| static inline uint16_t readh(const uintptr_t addr) | ||
| { | ||
| uint16_t val; | ||
|
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| asm volatile("lh %0, 0(%1)" | ||
| : "=r"(val) | ||
| : "r"((const volatile uint16_t *)addr) | ||
| : "memory"); | ||
| return val; | ||
| } | ||
|
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| static inline uint32_t readw(const uintptr_t addr) | ||
| { | ||
| uint32_t val; | ||
|
|
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| asm volatile("lw %0, 0(%1)" | ||
| : "=r"(val) | ||
| : "r"((const volatile uint32_t *)addr) | ||
| : "memory"); | ||
| return val; | ||
| } | ||
|
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| static inline uint64_t readd(const uintptr_t addr) | ||
| { | ||
| uint64_t val; | ||
|
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| asm volatile("ld %0, 0(%1)" | ||
| : "=r"(val) | ||
| : "r"((const volatile uint64_t *)addr) | ||
| : "memory"); | ||
| return val; | ||
| } | ||
| #endif |
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