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/cpufunc.h> 34 #include <machine/metadata.h> 35 #include <machine/psl.h> 36 #include <machine/specialreg.h> 37 #include "bootstrap.h" 38 #include "modinfo.h" 39 #include "libi386.h" 40 #include "btxv86.h" 41 42 #ifdef LOADER_GELI_SUPPORT 43 #include "geliboot.h" 44 #endif 45 46 /* 47 * Check to see if this CPU supports long mode. 48 */ 49 static int 50 bi_checkcpu(void) 51 { 52 char *cpu_vendor; 53 int vendor[3]; 54 int eflags; 55 unsigned int regs[4]; 56 57 /* Check for presence of "cpuid". */ 58 eflags = read_eflags(); 59 write_eflags(eflags ^ PSL_ID); 60 if (!((eflags ^ read_eflags()) & PSL_ID)) 61 return (0); 62 63 /* Fetch the vendor string. */ 64 do_cpuid(0, regs); 65 vendor[0] = regs[1]; 66 vendor[1] = regs[3]; 67 vendor[2] = regs[2]; 68 cpu_vendor = (char *)vendor; 69 70 /* Check for vendors that support AMD features. */ 71 if (strncmp(cpu_vendor, INTEL_VENDOR_ID, 12) != 0 && 72 strncmp(cpu_vendor, AMD_VENDOR_ID, 12) != 0 && 73 strncmp(cpu_vendor, HYGON_VENDOR_ID, 12) != 0 && 74 strncmp(cpu_vendor, CENTAUR_VENDOR_ID, 12) != 0) 75 return (0); 76 77 /* Has to support AMD features. */ 78 do_cpuid(0x80000000, regs); 79 if (!(regs[0] >= 0x80000001)) 80 return (0); 81 82 /* Check for long mode. */ 83 do_cpuid(0x80000001, regs); 84 return (regs[3] & AMDID_LM); 85 } 86 87 /* 88 * Load the information expected by an amd64 kernel. 89 * 90 * - The 'boothowto' argument is constructed 91 * - The 'bootdev' argument is constructed 92 * - The 'bootinfo' struct is constructed, and copied into the kernel space. 93 * - The kernel environment is copied into kernel space. 94 * - Module metadata are formatted and placed in kernel space. 95 */ 96 int 97 bi_load64(char *args, vm_offset_t *modulep, 98 vm_offset_t *kernendp, int add_smap) 99 { 100 struct preloaded_file *xp, *kfp; 101 struct i386_devdesc *rootdev; 102 struct file_metadata *md; 103 uint64_t kernend; 104 uint64_t envp; 105 uint64_t module; 106 uint64_t addr; 107 vm_offset_t size; 108 char *rootdevname; 109 int howto; 110 111 if (!bi_checkcpu()) { 112 printf("CPU doesn't support long mode\n"); 113 return (EINVAL); 114 } 115 116 howto = bi_getboothowto(args); 117 118 /* 119 * Allow the environment variable 'rootdev' to override the supplied device 120 * This should perhaps go to MI code and/or have $rootdev tested/set by 121 * MI code before launching the kernel. 122 */ 123 rootdevname = getenv("rootdev"); 124 i386_getdev((void **)(&rootdev), rootdevname, NULL); 125 if (rootdev == NULL) { /* bad $rootdev/$currdev */ 126 printf("can't determine root device\n"); 127 return(EINVAL); 128 } 129 130 /* Try reading the /etc/fstab file to select the root device */ 131 getrootmount(devformat(&rootdev->dd)); 132 133 addr = 0; 134 /* find the last module in the chain */ 135 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 136 if (addr < (xp->f_addr + xp->f_size)) 137 addr = xp->f_addr + xp->f_size; 138 } 139 /* pad to a page boundary */ 140 addr = roundup(addr, PAGE_SIZE); 141 142 addr = build_font_module(addr); 143 144 /* place the metadata before anything */ 145 module = *modulep = addr; 146 147 kfp = file_findfile(NULL, "elf kernel"); 148 if (kfp == NULL) 149 kfp = file_findfile(NULL, "elf64 kernel"); 150 if (kfp == NULL) 151 panic("can't find kernel file"); 152 kernend = 0; /* fill it in later */ 153 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto); 154 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp); 155 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend); 156 file_addmetadata(kfp, MODINFOMD_MODULEP, sizeof module, &module); 157 if (add_smap != 0) 158 bios_addsmapdata(kfp); 159 #ifdef LOADER_GELI_SUPPORT 160 geli_export_key_metadata(kfp); 161 #endif 162 bi_load_vbe_data(kfp); 163 164 size = md_copymodules(0, true); 165 166 /* copy our environment */ 167 envp = roundup(addr + size, PAGE_SIZE); 168 addr = md_copyenv(envp); 169 170 /* set kernend */ 171 kernend = roundup(addr, PAGE_SIZE); 172 *kernendp = kernend; 173 174 /* patch MODINFOMD_KERNEND */ 175 md = file_findmetadata(kfp, MODINFOMD_KERNEND); 176 bcopy(&kernend, md->md_data, sizeof kernend); 177 178 /* patch MODINFOMD_ENVP */ 179 md = file_findmetadata(kfp, MODINFOMD_ENVP); 180 bcopy(&envp, md->md_data, sizeof envp); 181 182 /* copy module list and metadata */ 183 (void)md_copymodules(*modulep, true); 184 185 return(0); 186 } 187