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 bi = calloc(sizeof(*bi), 1); 95 switch(rootdev->dd.d_dev->dv_type) { 96 case DEVT_CD: 97 case DEVT_DISK: 98 /* pass in the BIOS device number of the current disk */ 99 bi->bi_bios_dev = bd_unit2bios(rootdev); 100 bootdevnr = bd_getdev(rootdev); 101 break; 102 103 case DEVT_NET: 104 case DEVT_ZFS: 105 break; 106 107 default: 108 printf("WARNING - don't know how to boot from device type %d\n", 109 rootdev->dd.d_dev->dv_type); 110 } 111 if (bootdevnr == -1) { 112 printf("root device %s invalid\n", devformat(&rootdev->dd)); 113 return (EINVAL); 114 } 115 free(rootdev); 116 117 /* find the last module in the chain */ 118 addr = 0; 119 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 120 if (addr < (xp->f_addr + xp->f_size)) 121 addr = xp->f_addr + xp->f_size; 122 } 123 /* pad to a page boundary */ 124 addr = roundup(addr, PAGE_SIZE); 125 126 addr = build_font_module(addr); 127 128 /* copy our environment */ 129 envp = addr; 130 addr = md_copyenv(addr); 131 132 /* pad to a page boundary */ 133 addr = roundup(addr, PAGE_SIZE); 134 135 kfp = file_findfile(NULL, "elf kernel"); 136 if (kfp == NULL) 137 kfp = file_findfile(NULL, "elf32 kernel"); 138 if (kfp == NULL) 139 panic("can't find kernel file"); 140 kernend = 0; /* fill it in later */ 141 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto); 142 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp); 143 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend); 144 bios_addsmapdata(kfp); 145 #ifdef LOADER_GELI_SUPPORT 146 geli_export_key_metadata(kfp); 147 #endif 148 bi_load_vbe_data(kfp); 149 150 /* Figure out the size and location of the metadata */ 151 *modulep = addr; 152 size = md_copymodules(0, false); 153 kernend = roundup(addr + size, PAGE_SIZE); 154 *kernendp = kernend; 155 156 /* patch MODINFOMD_KERNEND */ 157 md = file_findmetadata(kfp, MODINFOMD_KERNEND); 158 bcopy(&kernend, md->md_data, sizeof kernend); 159 160 /* copy module list and metadata */ 161 (void)md_copymodules(addr, false); 162 163 ssym = esym = 0; 164 md = file_findmetadata(kfp, MODINFOMD_SSYM); 165 if (md != NULL) 166 ssym = *((vm_offset_t *)&(md->md_data)); 167 md = file_findmetadata(kfp, MODINFOMD_ESYM); 168 if (md != NULL) 169 esym = *((vm_offset_t *)&(md->md_data)); 170 if (ssym == 0 || esym == 0) 171 ssym = esym = 0; /* sanity */ 172 173 /* legacy bootinfo structure */ 174 kernelname = getenv("kernelname"); 175 i386_getdev(NULL, kernelname, &kernelpath); 176 bi->bi_version = BOOTINFO_VERSION; 177 bi->bi_size = sizeof(*bi); 178 bi->bi_memsizes_valid = 1; 179 bi->bi_basemem = bios_basemem / 1024; 180 bi->bi_extmem = bios_extmem / 1024; 181 bi->bi_envp = envp; 182 bi->bi_modulep = *modulep; 183 bi->bi_kernend = kernend; 184 bi->bi_kernelname = VTOP(kernelpath); 185 bi->bi_symtab = ssym; /* XXX this is only the primary kernel symtab */ 186 bi->bi_esymtab = esym; 187 188 /* legacy boot arguments */ 189 *howtop = howto | RB_BOOTINFO; 190 *bootdevp = bootdevnr; 191 *bip = VTOP(bi); 192 193 return(0); 194 } 195