sys/boot/pc32/bootasm.h

   1 /*
   2  * Copyright (c) 2004 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/boot/pc32/bootasm.h,v 1.4 2004/07/27 19:37:15 dillon Exp $
  35  */
  36
  37 /*
  38  * Set the bootloader address set.
  39  *
  40  * UNSET - default backwards compatible boot blocks
  41  *   1   - experimental move addresses above 0x1000 and hardwire the user
  42  *         stack.
  43  *   2   - experimental move addresses abobe 0x2000 and hardwire the user
  44  *         stack.
  45  *      NOTE: some changes to the standard bootloader address set and the
  46  *            rest of the code are not reflected in the experimental sets
  47  */
  48 /* #define BOOT_NEWBOOTLOADER 2 */
  49
  50 /*
  51  * Various fixed constants that do not change
  52  */
  53
  54 #define BDA_MEM         0x413           /* Free memory          */
  55 #define BDA_SCR         0x449           /* Video mode           */
  56 #define BDA_POS         0x450           /* Cursor position      */
  57 #define BDA_BOOT        0x472           /* Boot howto flag      */
  58 #define BDA_NHRDRV      0x475           /* Number of drivers found by BIOS */
  59 #define BDA_KEYBOARD    0x496           /* BDA byte with keyboard bit */
  60
  61 /*
  62  * Structural equivalences
  63  */
  64 #define BOOTINFO_SIZE   0x48            /* bootinfo structure size */
  65 #define MEM_ARG_SIZE    0x18
  66 #define MEM_PAGE_SIZE   0x1000
  67 #define MEM_BTX_LDR_OFF MEM_PAGE_SIZE   /* offset of btx in the loader */
  68 #define USR_ARGOFFSET   (BOOTINFO_SIZE+MEM_ARG_SIZE)
  69
  70 /* -------- WARNING, BOOT0 STACK BELOW MEM_BIOS_LADDR -------- */
  71 #define MEM_BIOS_LADDR  0x7c00          /* Load address (static/BIOS) */
  72
  73 /*
  74  * This is the origin of boot2.bin relative to the BTX user address space
  75  * (e.g. physical address would be MEM_BTX_USR+BOOT2_VORIGIN).
  76  *
  77  * The physical origin is typically around 0xC000 and limits the size of
  78  * boot2 to 16K, otherwise the loader will overflow the segment in v86 mode.
  79  */
  80 #define BOOT2_VORIGIN   0x2000
  81
  82 /*
  83  * NOTE: BOOT0_ORIGIN is extracted from this file and used in boot0/Makefile
  84  *       BOOT1_ORIGIN is extracted from this file and used in boot2/Makefile
  85  *
  86  *       NOTE: boot0 has a variable space after its sector which contains
  87  *       the fake partition and other variables.  ~128 bytes should be reserved
  88  *       for this variable space, but it may overlap BOOT1's data space.
  89  */
  90
  91 #if !defined(BOOT_NEWBOOTLOADER)
  92
  93 /************************************************************************
  94  *                      STANDARD BOOTLOADER ADDRESS SET                 *
  95  ************************************************************************
  96  *
  97  *
  98  */
  99
 100 #define USR_ARGSPACE    0x1000          /* BTX loader / ttl argspace reserved */
 101
 102 #define BOOT0_ORIGIN    0x600           /* boot0 relocated to (512+128 bytes) */
 103 /* -------- WARNING, BOOT1 STACK BELOW BOOT1_ORIGIN ------- */
 104 #define BOOT1_ORIGIN    0x700           /* boot1 relocated to (512 bytes) */
 105 #define MEM_ARG         0x900           /* tmp arg store cdboot/pxeboot */
 106
 107 #define MEM_BTX_ESP     0x1000          /* btxldr top of stack? */
 108 #define MEM_BTX_START   0x1000          /* start of BTX memory */
 109 #define MEM_BTX_ESP0    0x1800          /* Supervisor stack */
 110 #define MEM_BTX_BUF     0x1800          /* Scratch buffer stack */
 111 #define MEM_BTX_ESPR    0x5e00          /* Real mode stack */
 112 #define MEM_BTX_IDT     0x5e00          /* IDT */
 113 #define MEM_BTX_TSS     0x5f98          /* TSS */
 114 #define MEM_BTX_MAP     0x6000          /* I/O bit map */
 115 #define MEM_BTX_TSS_END 0x7fff          /* Start of user memory */
 116
 117 /*
 118  * NOTE: page table location is hardwired in /usr/src/usr.sbin/btxld/btx.h
 119  */
 120 #define MEM_BTX_ZEND    0x7000          /* Zero from IDT to here in btx.S */
 121
 122 /********************   0x7c00 BIOS LOAD ADDRESS (512 bytes) **********/
 123
 124 /*
 125  * NOTE: BOOT2_LOAD_BUF also determines where the btx loader and boot2.bin
 126  *       code are loaded, since they are all in the boot2 file.
 127  */
 128 #define BOOT2_LOAD_BUF  0x8c00          /* boot1 loads boot2    */
 129 #define MEM_BTX_ORG     0x9000          /* base of BTX code */
 130 #define MEM_BTX_ENTRY   0x9010          /* BTX starts execution here */
 131 /*
 132  * WARNING!  The USR area may be messed around with in 16 bit code mode,
 133  *           data loaded should probably not cross 0xffff (e.g. boot2 loads
 134  *           ~8K at MEM_BTX_USR).
 135  *
 136  *           MEM_BTX_USR is basically the segment offset BTX uses when
 137  *           running 'client' code.  So address 0 in the client code will
 138  *           actually be physical address MEM_BTX_USR.
 139  */
 140 #define MEM_BTX_USR     0xa000          /* base of BTX client/user memory */
 141 #define MEM_BTX_USR_ARG 0xa100
 142
 143 /*
 144  * By default the user stack is (theoretically) placed at the top of
 145  * BIOS memory (typically around the 640K mark).  See btx.S.  BTX loads
 146  * the stack from a BIOS memory address (BDA_MEM) rather than figuring it
 147  * out from the smap.
 148  *
 149  * There aren't really any other places we can put it short of intruding on
 150  * the kernel/module load space.
 151  */
 152 /*#define MEM_BTX_USR_STK       0x3000000*/
 153 /*#define MEM_BTX_USR_STK       0x0F0000*/
 154
 155 #elif defined(BOOT_NEWBOOTLOADER) && BOOT_NEWBOOTLOADER == 1
 156
 157 /************************************************************************
 158  *              EXPERIMENTAL BOOTLOADER ADDRESS SET 1                   *
 159  ************************************************************************
 160  *
 161  *
 162  */
 163
 164 #define USR_ARGSPACE    0x1000          /* BTX loader / ttl argspace reserved */
 165 #define MEM_BTX_USR_STK 0x90000         /* (phys addr) btx client usr stack */
 166
 167 #define MEM_BTX_START   0x1000          /* (unchanged)          */
 168 #define MEM_BTX_ESP0    0x1800          /* (unchanged)          */
 169 #define MEM_BTX_BUF     0x1800          /* (unchanged)          */
 170 #define MEM_BTX_ESP1    0x1e00          /* (unchanged)          */
 171 #define MEM_BTX_IDT     0x1e00          /* (unchanged)          */
 172 #define MEM_BTX_TSS     0x1f98          /* (unchanged)          */
 173 #define MEM_BTX_MAP     0x2000          /* (unchanged)          */
 174 #define MEM_BTX_DIR     0x4000          /* (unchanged)          */
 175 #define MEM_BTX_TBL     0x5000          /* (unchanged)          */
 176 #define MEM_BTX_ZEND    0x7000          /* (unchanged)          */
 177
 178 #define MEM_BTX_ESP     0x7800          /* don't use 0x1000             */
 179 #define BOOT0_ORIGIN    0x7800          /* boot0 relocated              */
 180 #define BOOT1_ORIGIN    0x7900          /* boot1 relocated (data only?) */
 181 #define MEM_ARG         0x7b00          /* cdboot/pxeboot disk/slice xfer */
 182 /********************   0x7c00 BIOS LOAD ADDRESS (512 bytes) **********/
 183
 184 #define BOOT2_LOAD_BUF  0x8c00          /* (unchanged)          */
 185 #define MEM_BTX_ORG     0x9000          /* (unchanged)          */
 186 #define MEM_BTX_ENTRY   0x9010          /* (unchanged)          */
 187
 188 #define MEM_BTX_USR     0xa000          /* (unchanged)          */
 189 #define MEM_BTX_USR_ARG 0xa100          /* (unchanged)          */
 190
 191
 192 #elif defined(BOOT_NEWBOOTLOADER) && BOOT_NEWBOOTLOADER == 2
 193
 194 /************************************************************************
 195  *              EXPERIMENTAL BOOTLOADER ADDRESS SET 2                   *
 196  ************************************************************************
 197  *
 198  *
 199  */
 200 #define USR_ARGSPACE    0x1000          /* BTX loader / ttl argspace reserved */
 201 #define MEM_BTX_USR_STK 0x90000         /* (phys addr) btx client usr stack */
 202
 203 #define MEM_BTX_START   0x2000          /* (unchanged)          */
 204 #define MEM_BTX_ESP0    0x2800          /* (unchanged)          */
 205 #define MEM_BTX_BUF     0x2800          /* (unchanged)          */
 206 #define MEM_BTX_ESP1    0x2e00          /* (unchanged)          */
 207 #define MEM_BTX_IDT     0x2e00          /* (unchanged)          */
 208 #define MEM_BTX_TSS     0x2f98          /* (unchanged)          */
 209 #define MEM_BTX_MAP     0x3000          /* (unchanged)          */
 210 #define MEM_BTX_DIR     0x5000          /* (unchanged)          */
 211 /****** MEM_BTX_TBL (16K) SUPPORT REMOVED ***********************/
 212 #define MEM_BTX_ZEND    0x6000          /* (unchanged)          */
 213
 214 #define MEM_BTX_ESP     0x7800          /* don't use 0x1000             */
 215 #define BOOT0_ORIGIN    0x7800          /* boot0 relocated              */
 216 #define BOOT1_ORIGIN    0x7900          /* boot1 relocated (data only?) */
 217 #define MEM_ARG         0x7b00          /* cdboot/pxeboot disk/slice xfer */
 218 /********************   0x7c00 BIOS LOAD ADDRESS (512 bytes) **********/
 219
 220 #define BOOT2_LOAD_BUF  0x8c00          /* (unchanged)          */
 221 #define MEM_BTX_ORG     0x9000          /* (unchanged)          */
 222 #define MEM_BTX_ENTRY   0x9010          /* (unchanged)          */
 223
 224 #define MEM_BTX_USR     0xa000          /* base of BTX client/user memory */
 225 #define MEM_BTX_USR_ARG 0xa100          /* boot1->boot2 disk/slice xfer */
 226
 227 #else
 228
 229 #error "BAD BOOT_NEWBOOTLOADER SETTING.  UNSET TO GET DEFAULT"
 230
 231 #endif  /* BOOT_NEWBOOTLOADER */
 232