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/cpufunc.h> 33 #include <machine/metadata.h> 34 #include <machine/psl.h> 35 #include <machine/specialreg.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 /* 46 * Check to see if this CPU supports long mode. 47 */ 48 static int 49 bi_checkcpu(void) 50 { 51 char *cpu_vendor; 52 int vendor[3]; 53 int eflags; 54 unsigned int regs[4]; 55 56 /* Check for presence of "cpuid". */ 57 eflags = read_eflags(); 58 write_eflags(eflags ^ PSL_ID); 59 if (!((eflags ^ read_eflags()) & PSL_ID)) 60 return (0); 61 62 /* Fetch the vendor string. */ 63 do_cpuid(0, regs); 64 vendor[0] = regs[1]; 65 vendor[1] = regs[3]; 66 vendor[2] = regs[2]; 67 cpu_vendor = (char *)vendor; 68 69 /* Check for vendors that support AMD features. */ 70 if (strncmp(cpu_vendor, INTEL_VENDOR_ID, 12) != 0 && 71 strncmp(cpu_vendor, AMD_VENDOR_ID, 12) != 0 && 72 strncmp(cpu_vendor, HYGON_VENDOR_ID, 12) != 0 && 73 strncmp(cpu_vendor, CENTAUR_VENDOR_ID, 12) != 0) 74 return (0); 75 76 /* Has to support AMD features. */ 77 do_cpuid(0x80000000, regs); 78 if (!(regs[0] >= 0x80000001)) 79 return (0); 80 81 /* Check for long mode. */ 82 do_cpuid(0x80000001, regs); 83 return (regs[3] & AMDID_LM); 84 } 85 86 /* 87 * Load the information expected by an amd64 kernel. 88 * 89 * - The 'boothowto' argument is constructed 90 * - The 'bootdev' argument is constructed 91 * - The 'bootinfo' struct is constructed, and copied into the kernel space. 92 * - The kernel environment is copied into kernel space. 93 * - Module metadata are formatted and placed in kernel space. 94 */ 95 int 96 bi_load64(char *args, vm_offset_t *modulep, 97 vm_offset_t *kernendp, int add_smap) 98 { 99 struct preloaded_file *xp, *kfp; 100 struct i386_devdesc *rootdev; 101 struct file_metadata *md; 102 uint64_t kernend; 103 uint64_t envp; 104 uint64_t module; 105 uint64_t addr; 106 vm_offset_t size; 107 char *rootdevname; 108 int howto; 109 110 if (!bi_checkcpu()) { 111 printf("CPU doesn't support long mode\n"); 112 return (EINVAL); 113 } 114 115 howto = bi_getboothowto(args); 116 117 /* 118 * Allow the environment variable 'rootdev' to override the supplied device 119 * This should perhaps go to MI code and/or have $rootdev tested/set by 120 * MI code before launching the kernel. 121 */ 122 rootdevname = getenv("rootdev"); 123 i386_getdev((void **)(&rootdev), rootdevname, NULL); 124 if (rootdev == NULL) { /* bad $rootdev/$currdev */ 125 printf("can't determine root device\n"); 126 return(EINVAL); 127 } 128 129 /* Try reading the /etc/fstab file to select the root device */ 130 getrootmount(devformat(&rootdev->dd)); 131 132 addr = 0; 133 /* find the last module in the chain */ 134 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 135 if (addr < (xp->f_addr + xp->f_size)) 136 addr = xp->f_addr + xp->f_size; 137 } 138 /* pad to a page boundary */ 139 addr = roundup(addr, PAGE_SIZE); 140 141 addr = build_font_module(addr); 142 143 /* place the metadata before anything */ 144 module = *modulep = addr; 145 146 kfp = file_findfile(NULL, "elf kernel"); 147 if (kfp == NULL) 148 kfp = file_findfile(NULL, "elf64 kernel"); 149 if (kfp == NULL) 150 panic("can't find kernel file"); 151 kernend = 0; /* fill it in later */ 152 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto); 153 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp); 154 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend); 155 file_addmetadata(kfp, MODINFOMD_MODULEP, sizeof module, &module); 156 if (add_smap != 0) 157 bios_addsmapdata(kfp); 158 #ifdef LOADER_GELI_SUPPORT 159 geli_export_key_metadata(kfp); 160 #endif 161 bi_load_vbe_data(kfp); 162 163 size = md_copymodules(0, true); 164 165 /* copy our environment */ 166 envp = roundup(addr + size, PAGE_SIZE); 167 addr = md_copyenv(envp); 168 169 /* set kernend */ 170 kernend = roundup(addr, PAGE_SIZE); 171 *kernendp = kernend; 172 173 /* patch MODINFOMD_KERNEND */ 174 md = file_findmetadata(kfp, MODINFOMD_KERNEND); 175 bcopy(&kernend, md->md_data, sizeof kernend); 176 177 /* patch MODINFOMD_ENVP */ 178 md = file_findmetadata(kfp, MODINFOMD_ENVP); 179 bcopy(&envp, md->md_data, sizeof envp); 180 181 /* copy module list and metadata */ 182 (void)md_copymodules(*modulep, true); 183 184 return(0); 185 } 186