diff options
Diffstat (limited to 'gpxe/src/arch/i386/include/gpxe/x86_io.h')
| -rw-r--r-- | gpxe/src/arch/i386/include/gpxe/x86_io.h | 153 |
1 files changed, 0 insertions, 153 deletions
diff --git a/gpxe/src/arch/i386/include/gpxe/x86_io.h b/gpxe/src/arch/i386/include/gpxe/x86_io.h deleted file mode 100644 index beb5b22a..00000000 --- a/gpxe/src/arch/i386/include/gpxe/x86_io.h +++ /dev/null @@ -1,153 +0,0 @@ -#ifndef _GPXE_X86_IO_H -#define _GPXE_X86_IO_H - -/** @file - * - * gPXE I/O API for x86 - * - * i386 uses direct pointer dereferences for accesses to memory-mapped - * I/O space, and the inX/outX instructions for accesses to - * port-mapped I/O space. - * - * 64-bit atomic accesses (readq() and writeq()) use MMX instructions, - * and will crash original Pentium and earlier CPUs. Fortunately, no - * hardware that requires atomic 64-bit accesses will physically fit - * into a machine with such an old CPU anyway. - */ - -FILE_LICENCE ( GPL2_OR_LATER ); - -#ifdef IOAPI_X86 -#define IOAPI_PREFIX_x86 -#else -#define IOAPI_PREFIX_x86 __x86_ -#endif - -/* - * Memory space mappings - * - */ - -/* - * Physical<->Bus and Bus<->I/O address mappings - * - */ - -static inline __always_inline unsigned long -IOAPI_INLINE ( x86, phys_to_bus ) ( unsigned long phys_addr ) { - return phys_addr; -} - -static inline __always_inline unsigned long -IOAPI_INLINE ( x86, bus_to_phys ) ( unsigned long bus_addr ) { - return bus_addr; -} - -static inline __always_inline void * -IOAPI_INLINE ( x86, ioremap ) ( unsigned long bus_addr, size_t len __unused ) { - return phys_to_virt ( bus_addr ); -} - -static inline __always_inline void -IOAPI_INLINE ( x86, iounmap ) ( volatile const void *io_addr __unused ) { - /* Nothing to do */ -} - -static inline __always_inline unsigned long -IOAPI_INLINE ( x86, io_to_bus ) ( volatile const void *io_addr ) { - return virt_to_phys ( io_addr ); -} - -/* - * MMIO reads and writes up to 32 bits - * - */ - -#define X86_READX( _api_func, _type ) \ -static inline __always_inline _type \ -IOAPI_INLINE ( x86, _api_func ) ( volatile _type *io_addr ) { \ - return *io_addr; \ -} -X86_READX ( readb, uint8_t ); -X86_READX ( readw, uint16_t ); -X86_READX ( readl, uint32_t ); - -#define X86_WRITEX( _api_func, _type ) \ -static inline __always_inline void \ -IOAPI_INLINE ( x86, _api_func ) ( _type data, \ - volatile _type *io_addr ) { \ - *io_addr = data; \ -} -X86_WRITEX ( writeb, uint8_t ); -X86_WRITEX ( writew, uint16_t ); -X86_WRITEX ( writel, uint32_t ); - -/* - * PIO reads and writes up to 32 bits - * - */ - -#define X86_INX( _insn_suffix, _type, _reg_prefix ) \ -static inline __always_inline _type \ -IOAPI_INLINE ( x86, in ## _insn_suffix ) ( volatile _type *io_addr ) { \ - _type data; \ - __asm__ __volatile__ ( "in" #_insn_suffix " %w1, %" _reg_prefix "0" \ - : "=a" ( data ) : "Nd" ( io_addr ) ); \ - return data; \ -} \ -static inline __always_inline void \ -IOAPI_INLINE ( x86, ins ## _insn_suffix ) ( volatile _type *io_addr, \ - _type *data, \ - unsigned int count ) { \ - unsigned int discard_D; \ - __asm__ __volatile__ ( "rep ins" #_insn_suffix \ - : "=D" ( discard_D ) \ - : "d" ( io_addr ), "c" ( count ), \ - "0" ( data ) ); \ -} -X86_INX ( b, uint8_t, "b" ); -X86_INX ( w, uint16_t, "w" ); -X86_INX ( l, uint32_t, "k" ); - -#define X86_OUTX( _insn_suffix, _type, _reg_prefix ) \ -static inline __always_inline void \ -IOAPI_INLINE ( x86, out ## _insn_suffix ) ( _type data, \ - volatile _type *io_addr ) { \ - __asm__ __volatile__ ( "out" #_insn_suffix " %" _reg_prefix "0, %w1" \ - : : "a" ( data ), "Nd" ( io_addr ) ); \ -} \ -static inline __always_inline void \ -IOAPI_INLINE ( x86, outs ## _insn_suffix ) ( volatile _type *io_addr, \ - const _type *data, \ - unsigned int count ) { \ - unsigned int discard_S; \ - __asm__ __volatile__ ( "rep outs" #_insn_suffix \ - : "=S" ( discard_S ) \ - : "d" ( io_addr ), "c" ( count ), \ - "0" ( data ) ); \ -} -X86_OUTX ( b, uint8_t, "b" ); -X86_OUTX ( w, uint16_t, "w" ); -X86_OUTX ( l, uint32_t, "k" ); - -/* - * Slow down I/O - * - */ - -static inline __always_inline void -IOAPI_INLINE ( x86, iodelay ) ( void ) { - __asm__ __volatile__ ( "outb %al, $0x80" ); -} - -/* - * Memory barrier - * - */ - -static inline __always_inline void -IOAPI_INLINE ( x86, mb ) ( void ) { - __asm__ __volatile__ ( "lock; addl $0, 0(%%esp)" : : : "memory" ); -} - -#endif /* _GPXE_X86_IO_H */ |