| // Copyright 2016 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef HW_INOUT_H_ |
| #define HW_INOUT_H_ |
| |
| #include <zircon/compiler.h> |
| #include <stdint.h> |
| |
| __BEGIN_CDECLS |
| |
| #if defined(__x86_64__) || defined(__i386__) |
| static inline uint8_t inp(uint16_t _port) { |
| uint8_t rv; |
| __asm__ __volatile__("inb %1, %0" |
| : "=a"(rv) |
| : "d"(_port)); |
| return (rv); |
| } |
| |
| static inline uint16_t inpw(uint16_t _port) { |
| uint16_t rv; |
| __asm__ __volatile__("inw %1, %0" |
| : "=a"(rv) |
| : "d"(_port)); |
| return (rv); |
| } |
| |
| static inline uint32_t inpd(uint16_t _port) { |
| uint32_t rv; |
| __asm__ __volatile__("inl %1, %0" |
| : "=a"(rv) |
| : "d"(_port)); |
| return (rv); |
| } |
| |
| static inline void outp(uint16_t _port, uint8_t _data) { |
| __asm__ __volatile__("outb %1, %0" |
| : |
| : "d"(_port), |
| "a"(_data)); |
| } |
| |
| static inline void outpw(uint16_t _port, uint16_t _data) { |
| __asm__ __volatile__("outw %1, %0" |
| : |
| : "d"(_port), |
| "a"(_data)); |
| } |
| |
| static inline void outpd(uint16_t _port, uint32_t _data) { |
| __asm__ __volatile__("outl %1, %0" |
| : |
| : "d"(_port), |
| "a"(_data)); |
| } |
| #else |
| static inline uint8_t inp(uint16_t _port) { |
| return 0; |
| } |
| static inline uint16_t inpw(uint16_t _port) { |
| return 0; |
| } |
| static inline uint32_t inpd(uint16_t _port) { |
| return 0; |
| } |
| static inline void outp(uint16_t _port, uint8_t _data) {} |
| static inline void outpw(uint16_t _port, uint16_t _data) {} |
| static inline void outpd(uint16_t _port, uint32_t _data) {} |
| #endif |
| |
| __END_CDECLS |
| |
| #endif // HW_INOUT_H_ |
