src/arch/i386/core/x86_io.c

   1 /*
   2  * Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 FILE_LICENCE ( GPL2_OR_LATER );
  20
  21 #include <gpxe/io.h>
  22 #include <gpxe/x86_io.h>
  23
  24 /** @file
  25  *
  26  * gPXE I/O API for x86
  27  *
  28  */
  29
  30 /**
  31  * Read 64-bit qword from memory-mapped device
  32  *
  33  * @v io_addr           I/O address
  34  * @ret data            Value read
  35  *
  36  * This routine uses MMX instructions.
  37  */
  38 static uint64_t x86_readq ( volatile uint64_t *io_addr ) {
  39         uint64_t data;
  40         __asm__ __volatile__ ( "pushl %%edx\n\t"
  41                                "pushl %%eax\n\t"
  42                                "movq (%1), %%mm0\n\t"
  43                                "movq %%mm0, (%%esp)\n\t"
  44                                "popl %%eax\n\t"
  45                                "popl %%edx\n\t"
  46                                "emms\n\t"
  47                                : "=A" ( data ) : "r" ( io_addr ) );
  48         return data;
  49 }
  50
  51 /**
  52  * Write 64-bit qword to memory-mapped device
  53  *
  54  * @v data              Value to write
  55  * @v io_addr           I/O address
  56  *
  57  * This routine uses MMX instructions.
  58  */
  59 static void x86_writeq ( uint64_t data, volatile uint64_t *io_addr ) {
  60         __asm__ __volatile__ ( "pushl %%edx\n\t"
  61                                "pushl %%eax\n\t"
  62                                "movq (%%esp), %%mm0\n\t"
  63                                "movq %%mm0, (%1)\n\t"
  64                                "popl %%eax\n\t"
  65                                "popl %%edx\n\t"
  66                                "emms\n\t"
  67                                : : "A" ( data ), "r" ( io_addr ) );
  68 }
  69
  70 PROVIDE_IOAPI_INLINE ( x86, phys_to_bus );
  71 PROVIDE_IOAPI_INLINE ( x86, bus_to_phys );
  72 PROVIDE_IOAPI_INLINE ( x86, ioremap );
  73 PROVIDE_IOAPI_INLINE ( x86, iounmap );
  74 PROVIDE_IOAPI_INLINE ( x86, io_to_bus );
  75 PROVIDE_IOAPI_INLINE ( x86, readb );
  76 PROVIDE_IOAPI_INLINE ( x86, readw );
  77 PROVIDE_IOAPI_INLINE ( x86, readl );
  78 PROVIDE_IOAPI ( x86, readq, x86_readq );
  79 PROVIDE_IOAPI_INLINE ( x86, writeb );
  80 PROVIDE_IOAPI_INLINE ( x86, writew );
  81 PROVIDE_IOAPI_INLINE ( x86, writel );
  82 PROVIDE_IOAPI ( x86, writeq, x86_writeq );
  83 PROVIDE_IOAPI_INLINE ( x86, inb );
  84 PROVIDE_IOAPI_INLINE ( x86, inw );
  85 PROVIDE_IOAPI_INLINE ( x86, inl );
  86 PROVIDE_IOAPI_INLINE ( x86, outb );
  87 PROVIDE_IOAPI_INLINE ( x86, outw );
  88 PROVIDE_IOAPI_INLINE ( x86, outl );
  89 PROVIDE_IOAPI_INLINE ( x86, insb );
  90 PROVIDE_IOAPI_INLINE ( x86, insw );
  91 PROVIDE_IOAPI_INLINE ( x86, insl );
  92 PROVIDE_IOAPI_INLINE ( x86, outsb );
  93 PROVIDE_IOAPI_INLINE ( x86, outsw );
  94 PROVIDE_IOAPI_INLINE ( x86, outsl );
  95 PROVIDE_IOAPI_INLINE ( x86, iodelay );
  96 PROVIDE_IOAPI_INLINE ( x86, mb );