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 <i386/include/bootinfo.h> 35 #include <machine/cpufunc.h> 36 #include <machine/psl.h> 37 #include <machine/specialreg.h> 38 39 #include "bootstrap.h" 40 #include "modinfo.h" 41 #include "libuserboot.h" 42 43 /* 44 * Check to see if this CPU supports long mode. 45 */ 46 static int 47 bi_checkcpu(void) 48 { 49 #if 0 50 char *cpu_vendor; 51 int vendor[3]; 52 int eflags, regs[4]; 53 54 /* Check for presence of "cpuid". */ 55 eflags = read_eflags(); 56 write_eflags(eflags ^ PSL_ID); 57 if (!((eflags ^ read_eflags()) & PSL_ID)) 58 return (0); 59 60 /* Fetch the vendor string. */ 61 do_cpuid(0, regs); 62 vendor[0] = regs[1]; 63 vendor[1] = regs[3]; 64 vendor[2] = regs[2]; 65 cpu_vendor = (char *)vendor; 66 67 /* Check for vendors that support AMD features. */ 68 if (strncmp(cpu_vendor, INTEL_VENDOR_ID, 12) != 0 && 69 strncmp(cpu_vendor, AMD_VENDOR_ID, 12) != 0 && 70 strncmp(cpu_vendor, CENTAUR_VENDOR_ID, 12) != 0) 71 return (0); 72 73 /* Has to support AMD features. */ 74 do_cpuid(0x80000000, regs); 75 if (!(regs[0] >= 0x80000001)) 76 return (0); 77 78 /* Check for long mode. */ 79 do_cpuid(0x80000001, regs); 80 return (regs[3] & AMDID_LM); 81 #else 82 return (1); 83 #endif 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, vm_offset_t *kernendp) 97 { 98 struct preloaded_file *xp, *kfp; 99 struct devdesc *rootdev; 100 struct file_metadata *md; 101 vm_offset_t addr; 102 uint64_t kernend; 103 uint64_t envp; 104 vm_offset_t size; 105 char *rootdevname; 106 int howto; 107 108 if (!bi_checkcpu()) { 109 printf("CPU doesn't support long mode\n"); 110 return (EINVAL); 111 } 112 113 howto = bi_getboothowto(args); 114 115 /* 116 * Allow the environment variable 'rootdev' to override the supplied device 117 * This should perhaps go to MI code and/or have $rootdev tested/set by 118 * MI code before launching the kernel. 119 */ 120 rootdevname = getenv("rootdev"); 121 userboot_getdev((void **)(&rootdev), rootdevname, NULL); 122 if (rootdev == NULL) { /* bad $rootdev/$currdev */ 123 printf("can't determine root device\n"); 124 return(EINVAL); 125 } 126 127 /* Try reading the /etc/fstab file to select the root device */ 128 getrootmount(devformat(rootdev)); 129 130 /* find the last module in the chain */ 131 addr = 0; 132 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 133 if (addr < (xp->f_addr + xp->f_size)) 134 addr = xp->f_addr + xp->f_size; 135 } 136 /* pad to a page boundary */ 137 addr = roundup(addr, PAGE_SIZE); 138 139 /* copy our environment */ 140 envp = addr; 141 addr = md_copyenv(addr); 142 143 /* pad to a page boundary */ 144 addr = roundup(addr, PAGE_SIZE); 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 bios_addsmapdata(kfp); 156 157 /* Figure out the size and location of the metadata */ 158 *modulep = addr; 159 size = md_copymodules(0, true); 160 kernend = roundup(addr + size, PAGE_SIZE); 161 *kernendp = kernend; 162 163 /* patch MODINFOMD_KERNEND */ 164 md = file_findmetadata(kfp, MODINFOMD_KERNEND); 165 bcopy(&kernend, md->md_data, sizeof kernend); 166 167 /* copy module list and metadata */ 168 (void)md_copymodules(addr, true); 169 170 return(0); 171 } 172