1 /*- 2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <stand.h> 31 #include <sys/param.h> 32 #include <sys/reboot.h> 33 #include <sys/linker.h> 34 #include <machine/bootinfo.h> 35 #include <machine/metadata.h> 36 #include "bootstrap.h" 37 #include "modinfo.h" 38 #include "libi386.h" 39 #include "btxv86.h" 40 41 #ifdef LOADER_GELI_SUPPORT 42 #include "geliboot.h" 43 #endif 44 45 static struct bootinfo bi; 46 47 /* 48 * Load the information expected by an i386 kernel. 49 * 50 * - The 'boothowto' argument is constructed 51 * - The 'bootdev' argument is constructed 52 * - The 'bootinfo' struct is constructed, and copied into the kernel space. 53 * - The kernel environment is copied into kernel space. 54 * - Module metadata are formatted and placed in kernel space. 55 */ 56 int 57 bi_load32(char *args, int *howtop, int *bootdevp, vm_offset_t *bip, vm_offset_t *modulep, vm_offset_t *kernendp) 58 { 59 struct preloaded_file *xp, *kfp; 60 struct i386_devdesc *rootdev; 61 struct file_metadata *md; 62 vm_offset_t addr; 63 vm_offset_t kernend; 64 vm_offset_t envp; 65 vm_offset_t size; 66 vm_offset_t ssym, esym; 67 char *rootdevname; 68 int bootdevnr, i, howto; 69 char *kernelname; 70 const char *kernelpath; 71 72 howto = bi_getboothowto(args); 73 74 /* 75 * Allow the environment variable 'rootdev' to override the supplied device 76 * This should perhaps go to MI code and/or have $rootdev tested/set by 77 * MI code before launching the kernel. 78 */ 79 rootdevname = getenv("rootdev"); 80 i386_getdev((void **)(&rootdev), rootdevname, NULL); 81 if (rootdev == NULL) { /* bad $rootdev/$currdev */ 82 printf("can't determine root device\n"); 83 return(EINVAL); 84 } 85 86 /* Try reading the /etc/fstab file to select the root device */ 87 getrootmount(devformat(&rootdev->dd)); 88 89 /* Do legacy rootdev guessing */ 90 91 /* XXX - use a default bootdev of 0. Is this ok??? */ 92 bootdevnr = 0; 93 94 switch(rootdev->dd.d_dev->dv_type) { 95 case DEVT_CD: 96 case DEVT_DISK: 97 /* pass in the BIOS device number of the current disk */ 98 bi.bi_bios_dev = bd_unit2bios(rootdev); 99 bootdevnr = bd_getdev(rootdev); 100 break; 101 102 case DEVT_NET: 103 case DEVT_ZFS: 104 break; 105 106 default: 107 printf("WARNING - don't know how to boot from device type %d\n", 108 rootdev->dd.d_dev->dv_type); 109 } 110 if (bootdevnr == -1) { 111 printf("root device %s invalid\n", devformat(&rootdev->dd)); 112 return (EINVAL); 113 } 114 free(rootdev); 115 116 /* find the last module in the chain */ 117 addr = 0; 118 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 119 if (addr < (xp->f_addr + xp->f_size)) 120 addr = xp->f_addr + xp->f_size; 121 } 122 /* pad to a page boundary */ 123 addr = roundup(addr, PAGE_SIZE); 124 125 addr = build_font_module(addr); 126 127 /* copy our environment */ 128 envp = addr; 129 addr = md_copyenv(addr); 130 131 /* pad to a page boundary */ 132 addr = roundup(addr, PAGE_SIZE); 133 134 kfp = file_findfile(NULL, "elf kernel"); 135 if (kfp == NULL) 136 kfp = file_findfile(NULL, "elf32 kernel"); 137 if (kfp == NULL) 138 panic("can't find kernel file"); 139 kernend = 0; /* fill it in later */ 140 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto); 141 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp); 142 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend); 143 bios_addsmapdata(kfp); 144 #ifdef LOADER_GELI_SUPPORT 145 geli_export_key_metadata(kfp); 146 #endif 147 bi_load_vbe_data(kfp); 148 149 /* Figure out the size and location of the metadata */ 150 *modulep = addr; 151 size = md_copymodules(0, false); 152 kernend = roundup(addr + size, PAGE_SIZE); 153 *kernendp = kernend; 154 155 /* patch MODINFOMD_KERNEND */ 156 md = file_findmetadata(kfp, MODINFOMD_KERNEND); 157 bcopy(&kernend, md->md_data, sizeof kernend); 158 159 /* copy module list and metadata */ 160 (void)md_copymodules(addr, false); 161 162 ssym = esym = 0; 163 md = file_findmetadata(kfp, MODINFOMD_SSYM); 164 if (md != NULL) 165 ssym = *((vm_offset_t *)&(md->md_data)); 166 md = file_findmetadata(kfp, MODINFOMD_ESYM); 167 if (md != NULL) 168 esym = *((vm_offset_t *)&(md->md_data)); 169 if (ssym == 0 || esym == 0) 170 ssym = esym = 0; /* sanity */ 171 172 /* legacy bootinfo structure */ 173 kernelname = getenv("kernelname"); 174 i386_getdev(NULL, kernelname, &kernelpath); 175 bi.bi_version = BOOTINFO_VERSION; 176 for (i = 0; i < N_BIOS_GEOM; i++) 177 bi.bi_bios_geom[i] = bd_getbigeom(i); 178 bi.bi_size = sizeof(bi); 179 bi.bi_memsizes_valid = 1; 180 bi.bi_basemem = bios_basemem / 1024; 181 bi.bi_extmem = bios_extmem / 1024; 182 bi.bi_envp = envp; 183 bi.bi_modulep = *modulep; 184 bi.bi_kernend = kernend; 185 bi.bi_kernelname = VTOP(kernelpath); 186 bi.bi_symtab = ssym; /* XXX this is only the primary kernel symtab */ 187 bi.bi_esymtab = esym; 188 189 /* legacy boot arguments */ 190 *howtop = howto | RB_BOOTINFO; 191 *bootdevp = bootdevnr; 192 *bip = VTOP(&bi); 193 194 return(0); 195 } 196