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 <stand.h> 28 #include <sys/param.h> 29 #include <sys/reboot.h> 30 #include <sys/linker.h> 31 #include <machine/bootinfo.h> 32 #include <machine/metadata.h> 33 #include "bootstrap.h" 34 #include "modinfo.h" 35 #include "libi386.h" 36 #include "btxv86.h" 37 38 #ifdef LOADER_GELI_SUPPORT 39 #include "geliboot.h" 40 #endif 41 42 static struct bootinfo *bi; 43 44 /* 45 * Load the information expected by an i386 kernel. 46 * 47 * - The 'boothowto' argument is constructed 48 * - The 'bootdev' argument is constructed 49 * - The 'bootinfo' struct is constructed, and copied into the kernel space. 50 * - The kernel environment is copied into kernel space. 51 * - Module metadata are formatted and placed in kernel space. 52 */ 53 int 54 bi_load32(char *args, int *howtop, int *bootdevp, vm_offset_t *bip, vm_offset_t *modulep, vm_offset_t *kernendp) 55 { 56 struct preloaded_file *xp, *kfp; 57 struct i386_devdesc *rootdev; 58 struct file_metadata *md; 59 vm_offset_t addr; 60 vm_offset_t kernend; 61 vm_offset_t envp; 62 vm_offset_t size; 63 vm_offset_t ssym, esym; 64 char *rootdevname; 65 int bootdevnr, i, howto; 66 char *kernelname; 67 const char *kernelpath; 68 69 howto = bi_getboothowto(args); 70 71 /* 72 * Allow the environment variable 'rootdev' to override the supplied device 73 * This should perhaps go to MI code and/or have $rootdev tested/set by 74 * MI code before launching the kernel. 75 */ 76 rootdevname = getenv("rootdev"); 77 i386_getdev((void **)(&rootdev), rootdevname, NULL); 78 if (rootdev == NULL) { /* bad $rootdev/$currdev */ 79 printf("can't determine root device\n"); 80 return(EINVAL); 81 } 82 83 /* Try reading the /etc/fstab file to select the root device */ 84 getrootmount(devformat(&rootdev->dd)); 85 86 /* Do legacy rootdev guessing */ 87 88 /* XXX - use a default bootdev of 0. Is this ok??? */ 89 bootdevnr = 0; 90 91 bi = calloc(sizeof(*bi), 1); 92 switch(rootdev->dd.d_dev->dv_type) { 93 case DEVT_CD: 94 case DEVT_DISK: 95 /* pass in the BIOS device number of the current disk */ 96 bi->bi_bios_dev = bd_unit2bios(rootdev); 97 bootdevnr = bd_getdev(rootdev); 98 break; 99 100 case DEVT_NET: 101 case DEVT_ZFS: 102 break; 103 104 default: 105 printf("WARNING - don't know how to boot from device type %d\n", 106 rootdev->dd.d_dev->dv_type); 107 } 108 if (bootdevnr == -1) { 109 printf("root device %s invalid\n", devformat(&rootdev->dd)); 110 return (EINVAL); 111 } 112 free(rootdev); 113 114 /* find the last module in the chain */ 115 addr = 0; 116 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 117 if (addr < (xp->f_addr + xp->f_size)) 118 addr = xp->f_addr + xp->f_size; 119 } 120 /* pad to a page boundary */ 121 addr = roundup(addr, PAGE_SIZE); 122 123 addr = build_font_module(addr); 124 125 /* copy our environment */ 126 envp = addr; 127 addr = md_copyenv(addr); 128 129 /* pad to a page boundary */ 130 addr = roundup(addr, PAGE_SIZE); 131 132 kfp = file_findfile(NULL, "elf kernel"); 133 if (kfp == NULL) 134 kfp = file_findfile(NULL, "elf32 kernel"); 135 if (kfp == NULL) 136 panic("can't find kernel file"); 137 kernend = 0; /* fill it in later */ 138 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto); 139 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp); 140 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend); 141 bios_addsmapdata(kfp); 142 #ifdef LOADER_GELI_SUPPORT 143 geli_export_key_metadata(kfp); 144 #endif 145 bi_load_vbe_data(kfp); 146 147 /* Figure out the size and location of the metadata */ 148 *modulep = addr; 149 size = md_copymodules(0, false); 150 kernend = roundup(addr + size, PAGE_SIZE); 151 *kernendp = kernend; 152 153 /* patch MODINFOMD_KERNEND */ 154 md = file_findmetadata(kfp, MODINFOMD_KERNEND); 155 bcopy(&kernend, md->md_data, sizeof kernend); 156 157 /* copy module list and metadata */ 158 (void)md_copymodules(addr, false); 159 160 ssym = esym = 0; 161 md = file_findmetadata(kfp, MODINFOMD_SSYM); 162 if (md != NULL) 163 ssym = *((vm_offset_t *)&(md->md_data)); 164 md = file_findmetadata(kfp, MODINFOMD_ESYM); 165 if (md != NULL) 166 esym = *((vm_offset_t *)&(md->md_data)); 167 if (ssym == 0 || esym == 0) 168 ssym = esym = 0; /* sanity */ 169 170 /* legacy bootinfo structure */ 171 kernelname = getenv("kernelname"); 172 i386_getdev(NULL, kernelname, &kernelpath); 173 bi->bi_version = BOOTINFO_VERSION; 174 bi->bi_size = sizeof(*bi); 175 bi->bi_memsizes_valid = 1; 176 bi->bi_basemem = bios_basemem / 1024; 177 bi->bi_extmem = bios_extmem / 1024; 178 bi->bi_envp = envp; 179 bi->bi_modulep = *modulep; 180 bi->bi_kernend = kernend; 181 bi->bi_kernelname = VTOP(kernelpath); 182 bi->bi_symtab = ssym; /* XXX this is only the primary kernel symtab */ 183 bi->bi_esymtab = esym; 184 185 /* legacy boot arguments */ 186 *howtop = howto | RB_BOOTINFO; 187 *bootdevp = bootdevnr; 188 *bip = VTOP(bi); 189 190 return(0); 191 } 192