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 <i386/include/bootinfo.h> 33 34 #include "bootstrap.h" 35 #include "modinfo.h" 36 #include "libuserboot.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 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, howto; 66 char *kernelname; 67 const char *kernelpath; 68 uint64_t lowmem, highmem; 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 userboot_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)); 86 87 bootdevnr = 0; 88 #if 0 89 if (bootdevnr == -1) { 90 printf("root device %s invalid\n", devformat(rootdev)); 91 return (EINVAL); 92 } 93 #endif 94 free(rootdev); 95 96 /* find the last module in the chain */ 97 addr = 0; 98 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 99 if (addr < (xp->f_addr + xp->f_size)) 100 addr = xp->f_addr + xp->f_size; 101 } 102 /* pad to a page boundary */ 103 addr = roundup(addr, PAGE_SIZE); 104 105 /* copy our environment */ 106 envp = addr; 107 addr = md_copyenv(addr); 108 109 /* pad to a page boundary */ 110 addr = roundup(addr, PAGE_SIZE); 111 112 kfp = file_findfile(NULL, "elf kernel"); 113 if (kfp == NULL) 114 kfp = file_findfile(NULL, "elf32 kernel"); 115 if (kfp == NULL) 116 panic("can't find kernel file"); 117 kernend = 0; /* fill it in later */ 118 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto); 119 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp); 120 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend); 121 bios_addsmapdata(kfp); 122 #ifdef LOADER_GELI_SUPPORT 123 geli_export_key_metadata(kfp); 124 #endif 125 126 /* Figure out the size and location of the metadata */ 127 *modulep = addr; 128 size = md_copymodules(0, false); 129 kernend = roundup(addr + size, PAGE_SIZE); 130 *kernendp = kernend; 131 132 /* patch MODINFOMD_KERNEND */ 133 md = file_findmetadata(kfp, MODINFOMD_KERNEND); 134 bcopy(&kernend, md->md_data, sizeof kernend); 135 136 /* copy module list and metadata */ 137 (void)md_copymodules(addr, false); 138 139 ssym = esym = 0; 140 md = file_findmetadata(kfp, MODINFOMD_SSYM); 141 if (md != NULL) 142 ssym = *((vm_offset_t *)&(md->md_data)); 143 md = file_findmetadata(kfp, MODINFOMD_ESYM); 144 if (md != NULL) 145 esym = *((vm_offset_t *)&(md->md_data)); 146 if (ssym == 0 || esym == 0) 147 ssym = esym = 0; /* sanity */ 148 149 /* legacy bootinfo structure */ 150 kernelname = getenv("kernelname"); 151 userboot_getdev(NULL, kernelname, &kernelpath); 152 bi.bi_version = BOOTINFO_VERSION; 153 bi.bi_size = sizeof(bi); 154 CALLBACK(getmem, &lowmem, &highmem); 155 bi.bi_memsizes_valid = 1; 156 bi.bi_basemem = 640; 157 bi.bi_extmem = (lowmem - 0x100000) / 1024; 158 bi.bi_envp = envp; 159 bi.bi_modulep = *modulep; 160 bi.bi_kernend = kernend; 161 bi.bi_symtab = ssym; /* XXX this is only the primary kernel symtab */ 162 bi.bi_esymtab = esym; 163 164 /* 165 * Copy the legacy bootinfo and kernel name to the guest at 0x2000 166 */ 167 bi.bi_kernelname = 0x2000 + sizeof(bi); 168 CALLBACK(copyin, &bi, 0x2000, sizeof(bi)); 169 CALLBACK(copyin, kernelname, 0x2000 + sizeof(bi), strlen(kernelname) + 1); 170 171 /* legacy boot arguments */ 172 *howtop = howto | RB_BOOTINFO; 173 *bootdevp = bootdevnr; 174 *bip = 0x2000; 175 176 return(0); 177 } 178