sys/arch/acorn26/include/boot.h

   1 /* $NetBSD: boot.h,v 1.2 2002/03/24 23:37:43 bjh21 Exp $ */
   2 /*-
   3  * Copyright (c) 1998 Ben Harris
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. The name of the author may not be used to endorse or promote products
  15  *    derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28 /*
  29  * boot.h -- Stuff to do with starting the kernel
  30  */
  31
  32 #ifndef _ARM26_BOOT_H
  33 #define _ARM26_BOOT_H
  34
  35 #include <sys/types.h>
  36
  37 /*
  38  * Bootloader contract 0.2:
  39  *  + APCS conformant entry.
  40  *  + SVC mode.
  41  *  + Interrupts (IRQ and FIQ) disabled on CPU.
  42  *  + CPU caches disabled.
  43  *  + Physical memory below 512k is unused except for screen.
  44  *  + First three 32k blocks above 512k are zero page, stack and msgbuf.
  45  *  + From there to freebase should be preserved unless you know better.
  46  *  + From freebase to top of RAM is for general use.
  47  *  + VIDC is set up as specified (not really bootloader's job).
  48  */
  49
  50 #define BOOT_MAGIC 0x942B7DFE
  51
  52 struct bootconfig {
  53         u_int32_t magic;        /* BOOT_MAGIC */
  54         u_int32_t version;      /* minor version of structure */
  55         /* Standard NetBSD boot parameters */
  56         u_int32_t boothowto;    /* Reboot flags (single-user etc) */
  57         u_int32_t bootdev;      /* Boot device */
  58         u_int32_t ssym;         /* Start of debugging symbols */
  59         u_int32_t esym;         /* End of debugging symbols */
  60         /* Parameters gathered by OS_ReadMemMapInfo */
  61         u_int32_t nbpp;         /* Machine page size in bytes */
  62         u_int32_t npages;       /* Number of pages */
  63         /* Layout of physical memory. */
  64         u_int32_t txtbase;      /* Kernel text base */
  65         u_int32_t txtsize;      /* ... and size */
  66         u_int32_t database;     /* Ditto for data */
  67         u_int32_t datasize;     /* and bss */
  68         u_int32_t bssbase;      /* Note that base addresses are */
  69         u_int32_t bsssize;      /* "physical" ie bytes above 0x02000000 */
  70         u_int32_t freebase;     /* Start of free space */
  71         /* Framebuffer state -- used to initialise raster console */
  72         u_int32_t xpixels;      /* Pixels across screen (XWindLimit + 1) */
  73         u_int32_t ypixels;      /* Pixels down screen (YWindLimit + 1) */
  74         u_int32_t bpp;          /* Bits per pixel (1 << Log2BPP) */
  75         u_int32_t screenbase;   /* Physical base of screen */
  76         u_int32_t screensize;   /* Size of framebuffer (TotalScreenSize) */
  77         u_int32_t cpixelrow;    /* first free pixel row on screen */
  78         /* Version 0 ends here */
  79 };
  80
  81 #ifdef _KERNEL
  82 extern struct bootconfig bootconfig;
  83 #endif
  84 #endif