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 #include <stand.h> 29 #include <sys/param.h> 30 #include <sys/reboot.h> 31 #include <sys/linker.h> 32 #include <machine/bootinfo.h> 33 #include <machine/metadata.h> 34 #include "bootstrap.h" 35 #include "modinfo.h" 36 #include "libi386.h" 37 #include "btxv86.h" 38 39 #ifdef LOADER_GELI_SUPPORT 40 #include "geliboot.h" 41 #endif 42 43 static struct bootinfo *bi; 44 45 /* 46 * Load the information expected by an i386 kernel. 47 * 48 * - The 'boothowto' argument is constructed 49 * - The 'bootdev' argument is constructed 50 * - The 'bootinfo' struct is constructed, and copied into the kernel space. 51 * - The kernel environment is copied into kernel space. 52 * - Module metadata are formatted and placed in kernel space. 53 */ 54 int 55 bi_load32(char *args, int *howtop, int *bootdevp, vm_offset_t *bip, vm_offset_t *modulep, vm_offset_t *kernendp) 56 { 57 struct preloaded_file *xp, *kfp; 58 struct i386_devdesc *rootdev; 59 struct file_metadata *md; 60 vm_offset_t addr; 61 vm_offset_t kernend; 62 vm_offset_t envp; 63 vm_offset_t size; 64 vm_offset_t ssym, esym; 65 char *rootdevname; 66 int bootdevnr, i, howto; 67 char *kernelname; 68 const char *kernelpath; 69 70 howto = bi_getboothowto(args); 71 72 /* 73 * Allow the environment variable 'rootdev' to override the supplied device 74 * This should perhaps go to MI code and/or have $rootdev tested/set by 75 * MI code before launching the kernel. 76 */ 77 rootdevname = getenv("rootdev"); 78 i386_getdev((void **)(&rootdev), rootdevname, NULL); 79 if (rootdev == NULL) { /* bad $rootdev/$currdev */ 80 printf("can't determine root device\n"); 81 return(EINVAL); 82 } 83 84 /* Try reading the /etc/fstab file to select the root device */ 85 getrootmount(devformat(&rootdev->dd)); 86 87 /* Do legacy rootdev guessing */ 88 89 /* XXX - use a default bootdev of 0. Is this ok??? */ 90 bootdevnr = 0; 91 92 bi = calloc(sizeof(*bi), 1); 93 switch(rootdev->dd.d_dev->dv_type) { 94 case DEVT_CD: 95 case DEVT_DISK: 96 /* pass in the BIOS device number of the current disk */ 97 bi->bi_bios_dev = bd_unit2bios(rootdev); 98 bootdevnr = bd_getdev(rootdev); 99 break; 100 101 case DEVT_NET: 102 case DEVT_ZFS: 103 break; 104 105 default: 106 printf("WARNING - don't know how to boot from device type %d\n", 107 rootdev->dd.d_dev->dv_type); 108 } 109 if (bootdevnr == -1) { 110 printf("root device %s invalid\n", devformat(&rootdev->dd)); 111 return (EINVAL); 112 } 113 free(rootdev); 114 115 /* find the last module in the chain */ 116 addr = 0; 117 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 118 if (addr < (xp->f_addr + xp->f_size)) 119 addr = xp->f_addr + xp->f_size; 120 } 121 /* pad to a page boundary */ 122 addr = roundup(addr, PAGE_SIZE); 123 124 addr = build_font_module(addr); 125 126 /* copy our environment */ 127 envp = addr; 128 addr = md_copyenv(addr); 129 130 /* pad to a page boundary */ 131 addr = roundup(addr, PAGE_SIZE); 132 133 kfp = file_findfile(NULL, "elf kernel"); 134 if (kfp == NULL) 135 kfp = file_findfile(NULL, "elf32 kernel"); 136 if (kfp == NULL) 137 panic("can't find kernel file"); 138 kernend = 0; /* fill it in later */ 139 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto); 140 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp); 141 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend); 142 bios_addsmapdata(kfp); 143 #ifdef LOADER_GELI_SUPPORT 144 geli_export_key_metadata(kfp); 145 #endif 146 bi_load_vbe_data(kfp); 147 148 /* Figure out the size and location of the metadata */ 149 *modulep = addr; 150 size = md_copymodules(0, false); 151 kernend = roundup(addr + size, PAGE_SIZE); 152 *kernendp = kernend; 153 154 /* patch MODINFOMD_KERNEND */ 155 md = file_findmetadata(kfp, MODINFOMD_KERNEND); 156 bcopy(&kernend, md->md_data, sizeof kernend); 157 158 /* copy module list and metadata */ 159 (void)md_copymodules(addr, false); 160 161 ssym = esym = 0; 162 md = file_findmetadata(kfp, MODINFOMD_SSYM); 163 if (md != NULL) 164 ssym = *((vm_offset_t *)&(md->md_data)); 165 md = file_findmetadata(kfp, MODINFOMD_ESYM); 166 if (md != NULL) 167 esym = *((vm_offset_t *)&(md->md_data)); 168 if (ssym == 0 || esym == 0) 169 ssym = esym = 0; /* sanity */ 170 171 /* legacy bootinfo structure */ 172 kernelname = getenv("kernelname"); 173 i386_getdev(NULL, kernelname, &kernelpath); 174 bi->bi_version = BOOTINFO_VERSION; 175 bi->bi_size = sizeof(*bi); 176 bi->bi_memsizes_valid = 1; 177 bi->bi_basemem = bios_basemem / 1024; 178 bi->bi_extmem = bios_extmem / 1024; 179 bi->bi_envp = envp; 180 bi->bi_modulep = *modulep; 181 bi->bi_kernend = kernend; 182 bi->bi_kernelname = VTOP(kernelpath); 183 bi->bi_symtab = ssym; /* XXX this is only the primary kernel symtab */ 184 bi->bi_esymtab = esym; 185 186 /* legacy boot arguments */ 187 *howtop = howto | RB_BOOTINFO; 188 *bootdevp = bootdevnr; 189 *bip = VTOP(bi); 190 191 return(0); 192 } 193