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 #define FW_CFG_KERNEL_ADDR      0x07
  23 #define FW_CFG_KERNEL_SIZE      0x08
  24 #define FW_CFG_KERNEL_CMDLINE   0x09
  25 #define FW_CFG_INITRD_ADDR      0x0a
  26 #define FW_CFG_INITRD_SIZE      0x0b
  27 #define FW_CFG_KERNEL_ENTRY     0x10
  28 #define FW_CFG_KERNEL_DATA      0x11
  29 #define FW_CFG_INITRD_DATA      0x12
  30 #define FW_CFG_CMDLINE_ADDR     0x13
  31 #define FW_CFG_CMDLINE_SIZE     0x14
  32 #define FW_CFG_CMDLINE_DATA     0x15
  33 #define FW_CFG_SETUP_ADDR       0x16
  34 #define FW_CFG_SETUP_SIZE       0x17
  35 #define FW_CFG_SETUP_DATA       0x18
  36
  37 #define BIOS_CFG_IOPORT_CFG    0x510
  38 #define BIOS_CFG_IOPORT_DATA   0x511
  39
  40 #define FW_CFG_DMA_CTL_ERROR   0x01
  41 #define FW_CFG_DMA_CTL_READ    0x02
  42 #define FW_CFG_DMA_CTL_SKIP    0x04
  43 #define FW_CFG_DMA_CTL_SELECT  0x08
  44 #define FW_CFG_DMA_CTL_WRITE   0x10
  45
  46 #define FW_CFG_DMA_SIGNATURE 0x51454d5520434647ULL /* "QEMU CFG" */
  47
  48 #define BIOS_CFG_DMA_ADDR_HIGH  0x514
  49 #define BIOS_CFG_DMA_ADDR_LOW   0x518
  50
  51 /* Break the translation block flow so -d cpu shows us values */
  52 #define DEBUG_HERE              \
  53         jmp         1f;         \
  54         1:
  55
  56 /*
  57  * Read a variable from the fw_cfg device.
  58  * Clobbers: %edx
  59  * Out: %eax
  60  */
  61 .macro read_fw VAR
  62         mov         $\VAR, %ax
  63         mov         $BIOS_CFG_IOPORT_CFG, %dx
  64         outw        %ax, (%dx)
  65         mov         $BIOS_CFG_IOPORT_DATA, %dx
  66         inb         (%dx), %al
  67         shl         $8, %eax
  68         inb         (%dx), %al
  69         shl         $8, %eax
  70         inb         (%dx), %al
  71         shl         $8, %eax
  72         inb         (%dx), %al
  73         bswap       %eax
  74 .endm
  75
  76
  77 /*
  78  * Read data from the fw_cfg device using DMA.
  79  * Clobbers: %edx, %eax, ADDR, SIZE, memory[%esp-16] to memory[%esp]
  80  */
  81 .macro read_fw_dma VAR, SIZE, ADDR
  82         /* Address */
  83         bswapl      \ADDR
  84         pushl       \ADDR
  85
  86         /* We only support 32 bit target addresses */
  87         xorl        %eax, %eax
  88         pushl       %eax
  89         mov         $BIOS_CFG_DMA_ADDR_HIGH, %dx
  90         outl        %eax, (%dx)
  91
  92         /* Size */
  93         bswapl      \SIZE
  94         pushl       \SIZE
  95
  96         /* Control */
  97         movl        $(\VAR << 16) | (FW_CFG_DMA_CTL_READ | FW_CFG_DMA_CTL_SELECT), %eax
  98         bswapl      %eax
  99         pushl       %eax
 100
 101         movl        %esp, %eax /* Address of the struct we generated */
 102         bswapl      %eax
 103         mov         $BIOS_CFG_DMA_ADDR_LOW, %dx
 104         outl        %eax, (%dx) /* Initiate DMA */
 105
 106 1:      mov         (%esp), %eax /* Wait for completion */
 107         bswapl      %eax
 108         testl       $~FW_CFG_DMA_CTL_ERROR, %eax
 109         jnz         1b
 110         addl        $16, %esp
 111 .endm
 112
 113
 114 /*
 115  * Read a blob from the fw_cfg device using DMA
 116  * Requires _ADDR, _SIZE and _DATA values for the parameter.
 117  *
 118  * Clobbers: %eax, %edx, %es, %ecx, %edi and adresses %esp-20 to %esp
 119  */
 120 #ifdef USE_FW_CFG_DMA
 121 #define read_fw_blob_dma(var)                           \
 122         read_fw         var ## _SIZE;                   \
 123         mov             %eax, %ecx;                     \
 124         read_fw         var ## _ADDR;                   \
 125         mov             %eax, %edi ;                    \
 126         read_fw_dma     var ## _DATA, %ecx, %edi
 127 #else
 128 #define read_fw_blob_dma(var) read_fw_blob(var)
 129 #endif
 130
 131 #define read_fw_blob_pre(var)                           \
 132         read_fw         var ## _SIZE;                   \
 133         mov             %eax, %ecx;                     \
 134         mov             $var ## _DATA, %ax;             \
 135         mov             $BIOS_CFG_IOPORT_CFG, %edx;     \
 136         outw            %ax, (%dx);                     \
 137         mov             $BIOS_CFG_IOPORT_DATA, %dx;     \
 138         cld
 139
 140 /*
 141  * Read a blob from the fw_cfg device.
 142  * Requires _ADDR, _SIZE and _DATA values for the parameter.
 143  *
 144  * Clobbers: %eax, %edx, %es, %ecx, %edi
 145  */
 146 #define read_fw_blob(var)                               \
 147         read_fw         var ## _ADDR;                   \
 148         mov             %eax, %edi;                     \
 149         read_fw_blob_pre(var);                          \
 150         /* old as(1) doesn't like this insn so emit the bytes instead: \
 151         rep insb        (%dx), %es:(%edi);              \
 152         */                                              \
 153         .dc.b           0xf3,0x6c
 154
 155 /*
 156  * Read a blob from the fw_cfg device in forced addr32 mode.
 157  * Requires _ADDR, _SIZE and _DATA values for the parameter.
 158  *
 159  * Clobbers: %eax, %edx, %es, %ecx, %edi
 160  */
 161 #define read_fw_blob_addr32(var)                        \
 162         read_fw         var ## _ADDR;                   \
 163         mov             %eax, %edi;                     \
 164         read_fw_blob_pre(var);                          \
 165         /* old as(1) doesn't like this insn so emit the bytes instead: \
 166         addr32 rep insb (%dx), %es:(%edi);              \
 167         */                                              \
 168         .dc.b           0x67,0xf3,0x6c
 169
 170 /*
 171  * Read a blob from the fw_cfg device in forced addr32 mode, address is in %edi.
 172  * Requires _SIZE and _DATA values for the parameter.
 173  *
 174  * Clobbers: %eax, %edx, %edi, %es, %ecx
 175  */
 176 #define read_fw_blob_addr32_edi(var)                    \
 177         read_fw_blob_pre(var);                          \
 178         /* old as(1) doesn't like this insn so emit the bytes instead: \
 179         addr32 rep insb (%dx), %es:(%edi);              \
 180         */                                              \
 181         .dc.b           0x67,0xf3,0x6c
 182
 183 #define OPTION_ROM_START                                \
 184     .code16;                                            \
 185     .text;                                              \
 186         .global         _start;                         \
 187     _start:;                                            \
 188         .short          0xaa55;                         \
 189         .byte           (_end - _start) / 512;
 190
 191 #define BOOT_ROM_START                                  \
 192         OPTION_ROM_START                                \
 193         lret;                                           \
 194         .org            0x18;                           \
 195         .short          0;                              \
 196         .short          _pnph;                          \
 197     _pnph:                                              \
 198         .ascii          "$PnP";                         \
 199         .byte           0x01;                           \
 200         .byte           ( _pnph_len / 16 );             \
 201         .short          0x0000;                         \
 202         .byte           0x00;                           \
 203         .byte           0x00;                           \
 204         .long           0x00000000;                     \
 205         .short          _manufacturer;                  \
 206         .short          _product;                       \
 207         .long           0x00000000;                     \
 208         .short          0x0000;                         \
 209         .short          0x0000;                         \
 210         .short          _bev;                           \
 211         .short          0x0000;                         \
 212         .short          0x0000;                         \
 213         .equ            _pnph_len, . - _pnph;           \
 214     _bev:;                                              \
 215         /* DS = CS */                                   \
 216         movw            %cs, %ax;                       \
 217         movw            %ax, %ds;
 218
 219 #define OPTION_ROM_END                                  \
 220         .byte           0;                              \
 221         .align          512, 0;                         \
 222     _end:
 223
 224 #define BOOT_ROM_END                                    \
 225     _manufacturer:;                                     \
 226         .asciz "QEMU";                                  \
 227     _product:;                                          \
 228         .asciz BOOT_ROM_PRODUCT;                        \
 229         OPTION_ROM_END
 230