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