78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
/*
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* Mostly stolen from the linux kernel
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*/
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/**
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* @file
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* @brief x86 IO access functions
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*/
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#ifndef __ASM_X86_IO_H
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#define __ASM_X86_IO_H
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#include <asm/byteorder.h>
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#define IO_SPACE_LIMIT 0xffff
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static inline void outb(unsigned char value, int port)
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{
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asm volatile("outb %b0, %w1" : : "a"(value), "Nd"(port));
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}
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static inline void outw(unsigned short value, int port)
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{
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asm volatile("outw %w0, %w1" : : "a"(value), "Nd"(port));
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}
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static inline void outl(unsigned long value, int port)
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{
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asm volatile("outl %0, %w1" : : "a"(value), "Nd"(port));
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}
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static inline unsigned char inb(int port)
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{
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unsigned char value;
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asm volatile("inb %w1, %b0" : "=a"(value) : "Nd"(port));
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return value;
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}
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static inline unsigned short inw(int port)
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{
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unsigned short value;
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asm volatile("inw %w1, %w0" : "=a"(value) : "Nd"(port));
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return value;
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}
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static inline unsigned long inl(int port)
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{
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unsigned long value;
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asm volatile("inl %w1, %0" : "=a"(value) : "Nd"(port));
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return value;
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}
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#define build_mmio_read(name, size, type, reg, barrier) \
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static inline type name(const volatile void *addr) \
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{ type ret; asm volatile("mov" size " %1,%0":reg (ret) \
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:"m" (*(volatile type*)addr) barrier); return ret; }
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build_mmio_read(readb, "b", unsigned char, "=q", :"memory")
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build_mmio_read(readw, "w", unsigned short, "=r", :"memory")
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build_mmio_read(readl, "l", unsigned int, "=r", :"memory")
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#define build_mmio_write(name, size, type, reg, barrier) \
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static inline void name(type val, volatile void *addr) \
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{ asm volatile("mov" size " %0,%1": :reg (val), \
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"m" (*(volatile type*)addr) barrier); }
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build_mmio_write(writeb, "b", unsigned char, "q", :"memory")
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build_mmio_write(writew, "w", unsigned short, "r", :"memory")
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build_mmio_write(writel, "l", unsigned int, "r", :"memory")
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/* do a tiny io delay */
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static inline void io_delay(void)
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{
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inb(0x80);
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}
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#endif /* __ASM_X86_IO_H */
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