payloads/libpayload/include/x86/arch/io.h

   1 /*
   2  *
   3  * Copyright (C) 2008 Advanced Micro Devices, Inc.
   4  * Copyright (C) 2008 coresystems GmbH
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. The name of the author may not be used to endorse or promote products
  15  *    derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef _ARCH_IO_H
  31 #define _ARCH_IO_H
  32
  33 #include <inttypes.h>
  34
  35 /*
  36  * readb/w/l writeb/w/l are deprecated. use read8/16/32 and write8/16/32
  37  * instead for future development.
  38  *
  39  * TODO: make the existing code use read8/16/32 and write8/16/32 then remove
  40  * readb/w/l and writeb/w/l.
  41  */
  42
  43 #define readb(_a) (*(volatile const unsigned char *) (_a))
  44 #define readw(_a) (*(volatile const unsigned short *) (_a))
  45 #define readl(_a) (*(volatile const unsigned int *) (_a))
  46
  47 #define writeb(_v, _a) (*(volatile unsigned char *) (_a) = (_v))
  48 #define writew(_v, _a) (*(volatile unsigned short *) (_a) = (_v))
  49 #define writel(_v, _a) (*(volatile unsigned int *) (_a) = (_v))
  50
  51 static inline __attribute__((always_inline)) uint8_t read8(const volatile void *addr)
  52 {
  53         return *((volatile uint8_t *)(addr));
  54 }
  55
  56 static inline __attribute__((always_inline)) uint16_t read16(const volatile void *addr)
  57 {
  58         return *((volatile uint16_t *)(addr));
  59 }
  60
  61 static inline __attribute__((always_inline)) uint32_t read32(const volatile void *addr)
  62 {
  63         return *((volatile uint32_t *)(addr));
  64 }
  65
  66 static inline __attribute__((always_inline)) uint64_t read64(const volatile void *addr)
  67 {
  68         return *((volatile uint64_t *)(addr));
  69 }
  70
  71 static inline __attribute__((always_inline)) void write8(volatile void *addr, uint8_t value)
  72 {
  73         *((volatile uint8_t *)(addr)) = value;
  74 }
  75
  76 static inline __attribute__((always_inline)) void write16(volatile void *addr, uint16_t value)
  77 {
  78         *((volatile uint16_t *)(addr)) = value;
  79 }
  80
  81 static inline __attribute__((always_inline)) void write32(volatile void *addr, uint32_t value)
  82 {
  83         *((volatile uint32_t *)(addr)) = value;
  84 }
  85
  86 static inline __attribute__((always_inline)) void write64(volatile void *addr, uint64_t value)
  87 {
  88         *((volatile uint64_t *)(addr)) = value;
  89 }
  90
  91 static inline unsigned int inl(int port)
  92 {
  93         unsigned long val;
  94         __asm__ __volatile__("inl %w1, %0" : "=a"(val) : "Nd"(port));
  95         return val;
  96 }
  97
  98 static inline unsigned short inw(int port)
  99 {
 100         unsigned short val;
 101         __asm__ __volatile__("inw %w1, %w0" : "=a"(val) : "Nd"(port));
 102         return val;
 103 }
 104
 105 static inline unsigned char inb(int port)
 106 {
 107         unsigned char val;
 108         __asm__ __volatile__("inb %w1, %b0" : "=a"(val) : "Nd"(port));
 109         return val;
 110 }
 111
 112 static inline void outl(unsigned int val, int port)
 113 {
 114         __asm__ __volatile__("outl %0, %w1" : : "a"(val), "Nd"(port));
 115 }
 116
 117 static inline void outw(unsigned short val, int port)
 118 {
 119         __asm__ __volatile__("outw %w0, %w1" : : "a"(val), "Nd"(port));
 120 }
 121
 122 static inline void outb(unsigned char val, int port)
 123 {
 124         __asm__ __volatile__("outb %b0, %w1" : : "a"(val), "Nd"(port));
 125 }
 126
 127 static inline void outsl(int port, const void *addr, unsigned long count)
 128 {
 129         __asm__ __volatile__("rep; outsl" : "+S"(addr), "+c"(count) : "d"(port));
 130 }
 131
 132 static inline void outsw(int port, const void *addr, unsigned long count)
 133 {
 134         __asm__ __volatile__("rep; outsw" : "+S"(addr), "+c"(count) : "d"(port));
 135 }
 136
 137 static inline void outsb(int port, const void *addr, unsigned long count)
 138 {
 139         __asm__ __volatile__("rep; outsb" : "+S"(addr), "+c"(count) : "d"(port));
 140 }
 141
 142 static inline void insl(int port, void *addr, unsigned long count)
 143 {
 144         __asm__ __volatile__("rep; insl" : "+D"(addr), "+c"(count) : "d"(port)
 145                              : "memory");
 146 }
 147
 148 static inline void insw(int port, void *addr, unsigned long count)
 149 {
 150         __asm__ __volatile__("rep; insw" : "+D"(addr), "+c"(count) : "d"(port)
 151                              : "memory");
 152 }
 153
 154 static inline void insb(int port, void *addr, unsigned long count)
 155 {
 156         __asm__ __volatile__("rep; insb" : "+D"(addr), "+c"(count) : "d"(port)
 157                              : "memory");
 158 }
 159
 160 #endif