LXR qemu/pc-bios/optionrom/optionrom.h

   1/*
   2 * Common Option ROM Functions
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; either version 2 of the License, or
   7 * (at your option) any later version.
   8 *
   9 * This program is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12 * GNU 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, see <http://www.gnu.org/licenses/>.
  16 *
  17 * Copyright Novell Inc, 2009
  18 *   Authors: Alexander Graf <agraf@suse.de>
  19 */
  20
  21
  22#include "../../include/hw/nvram/fw_cfg_keys.h"
  23
  24#define BIOS_CFG_IOPORT_CFG     0x510
  25#define BIOS_CFG_IOPORT_DATA    0x511
  26
  27/* Break the translation block flow so -d cpu shows us values */
  28#define DEBUG_HERE \
  29        jmp             1f;                             \
  30        1:
  31        
  32/*
  33 * Read a variable from the fw_cfg device.
  34 * Clobbers:    %edx
  35 * Out:         %eax
  36 */
  37.macro read_fw VAR
  38        mov             $\VAR, %ax
  39        mov             $BIOS_CFG_IOPORT_CFG, %dx
  40        outw            %ax, (%dx)
  41        mov             $BIOS_CFG_IOPORT_DATA, %dx
  42        inb             (%dx), %al
  43        shl             $8, %eax
  44        inb             (%dx), %al
  45        shl             $8, %eax
  46        inb             (%dx), %al
  47        shl             $8, %eax
  48        inb             (%dx), %al
  49        bswap           %eax
  50.endm
  51
  52#define read_fw_blob_pre(var)                           \
  53        read_fw         var ## _SIZE;                   \
  54        mov             %eax, %ecx;                     \
  55        mov             $var ## _DATA, %ax;             \
  56        mov             $BIOS_CFG_IOPORT_CFG, %edx;     \
  57        outw            %ax, (%dx);                     \
  58        mov             $BIOS_CFG_IOPORT_DATA, %dx;     \
  59        cld
  60
  61/*
  62 * Read a blob from the fw_cfg device.
  63 * Requires _ADDR, _SIZE and _DATA values for the parameter.
  64 *
  65 * Clobbers:    %eax, %edx, %es, %ecx, %edi
  66 */
  67#define read_fw_blob(var)                               \
  68        read_fw         var ## _ADDR;                   \
  69        mov             %eax, %edi;                     \
  70        read_fw_blob_pre(var);                          \
  71        /* old as(1) doesn't like this insn so emit the bytes instead: \
  72        rep insb        (%dx), %es:(%edi);              \
  73        */                                              \
  74        .dc.b           0xf3,0x6c
  75
  76/*
  77 * Read a blob from the fw_cfg device in forced addr32 mode.
  78 * Requires _ADDR, _SIZE and _DATA values for the parameter.
  79 *
  80 * Clobbers:    %eax, %edx, %es, %ecx, %edi
  81 */
  82#define read_fw_blob_addr32(var)                        \
  83        read_fw         var ## _ADDR;                   \
  84        mov             %eax, %edi;                     \
  85        read_fw_blob_pre(var);                          \
  86        /* old as(1) doesn't like this insn so emit the bytes instead: \
  87        addr32 rep insb (%dx), %es:(%edi);              \
  88        */                                              \
  89        .dc.b           0x67,0xf3,0x6c
  90
  91/*
  92 * Read a blob from the fw_cfg device in forced addr32 mode, address is in %edi.
  93 * Requires _SIZE and _DATA values for the parameter.
  94 *
  95 * Clobbers:    %eax, %edx, %edi, %es, %ecx
  96 */
  97#define read_fw_blob_addr32_edi(var)                    \
  98        read_fw_blob_pre(var);                          \
  99        /* old as(1) doesn't like this insn so emit the bytes instead: \
 100        addr32 rep insb (%dx), %es:(%edi);              \
 101        */                                              \
 102        .dc.b           0x67,0xf3,0x6c
 103
 104#define OPTION_ROM_START                                        \
 105    .code16;                                            \
 106    .text;                                              \
 107        .global         _start;                         \
 108    _start:;                                            \
 109        .short          0xaa55;                         \
 110        .byte           (_end - _start) / 512;
 111
 112#define BOOT_ROM_START                                  \
 113        OPTION_ROM_START                                \
 114        lret;                                           \
 115        .org            0x18;                           \
 116        .short          0;                              \
 117        .short          _pnph;                          \
 118    _pnph:                                              \
 119        .ascii          "$PnP";                         \
 120        .byte           0x01;                           \
 121        .byte           ( _pnph_len / 16 );             \
 122        .short          0x0000;                         \
 123        .byte           0x00;                           \
 124        .byte           0x00;                           \
 125        .long           0x00000000;                     \
 126        .short          _manufacturer;                  \
 127        .short          _product;                       \
 128        .long           0x00000000;                     \
 129        .short          0x0000;                         \
 130        .short          0x0000;                         \
 131        .short          _bev;                           \
 132        .short          0x0000;                         \
 133        .short          0x0000;                         \
 134        .equ            _pnph_len, . - _pnph;           \
 135    _bev:;                                              \
 136        /* DS = CS */                                   \
 137        movw            %cs, %ax;                       \
 138        movw            %ax, %ds;
 139
 140#define OPTION_ROM_END                                  \
 141        .byte           0;                              \
 142        .align          512, 0;                         \
 143    _end:
 144
 145#define BOOT_ROM_END                                    \
 146    _manufacturer:;                                     \
 147        .asciz "QEMU";                                  \
 148    _product:;                                          \
 149        .asciz BOOT_ROM_PRODUCT;                        \
 150        OPTION_ROM_END
 151
 152