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 <i386/include/bootinfo.h> 32 #include <machine/cpufunc.h> 33 #include <machine/psl.h> 34 #include <machine/specialreg.h> 35 36 #include "bootstrap.h" 37 #include "modinfo.h" 38 #include "libuserboot.h" 39 40 /* 41 * Check to see if this CPU supports long mode. 42 */ 43 static int 44 bi_checkcpu(void) 45 { 46 #if 0 47 char *cpu_vendor; 48 int vendor[3]; 49 int eflags, regs[4]; 50 51 /* Check for presence of "cpuid". */ 52 eflags = read_eflags(); 53 write_eflags(eflags ^ PSL_ID); 54 if (!((eflags ^ read_eflags()) & PSL_ID)) 55 return (0); 56 57 /* Fetch the vendor string. */ 58 do_cpuid(0, regs); 59 vendor[0] = regs[1]; 60 vendor[1] = regs[3]; 61 vendor[2] = regs[2]; 62 cpu_vendor = (char *)vendor; 63 64 /* Check for vendors that support AMD features. */ 65 if (strncmp(cpu_vendor, INTEL_VENDOR_ID, 12) != 0 && 66 strncmp(cpu_vendor, AMD_VENDOR_ID, 12) != 0 && 67 strncmp(cpu_vendor, CENTAUR_VENDOR_ID, 12) != 0) 68 return (0); 69 70 /* Has to support AMD features. */ 71 do_cpuid(0x80000000, regs); 72 if (!(regs[0] >= 0x80000001)) 73 return (0); 74 75 /* Check for long mode. */ 76 do_cpuid(0x80000001, regs); 77 return (regs[3] & AMDID_LM); 78 #else 79 return (1); 80 #endif 81 } 82 83 /* 84 * Load the information expected by an amd64 kernel. 85 * 86 * - The 'boothowto' argument is constructed 87 * - The 'bootdev' argument is constructed 88 * - The 'bootinfo' struct is constructed, and copied into the kernel space. 89 * - The kernel environment is copied into kernel space. 90 * - Module metadata are formatted and placed in kernel space. 91 */ 92 int 93 bi_load64(char *args, vm_offset_t *modulep, vm_offset_t *kernendp) 94 { 95 struct preloaded_file *xp, *kfp; 96 struct devdesc *rootdev; 97 struct file_metadata *md; 98 vm_offset_t addr; 99 uint64_t kernend; 100 uint64_t envp; 101 vm_offset_t size; 102 char *rootdevname; 103 int howto; 104 105 if (!bi_checkcpu()) { 106 printf("CPU doesn't support long mode\n"); 107 return (EINVAL); 108 } 109 110 howto = bi_getboothowto(args); 111 112 /* 113 * Allow the environment variable 'rootdev' to override the supplied device 114 * This should perhaps go to MI code and/or have $rootdev tested/set by 115 * MI code before launching the kernel. 116 */ 117 rootdevname = getenv("rootdev"); 118 userboot_getdev((void **)(&rootdev), rootdevname, NULL); 119 if (rootdev == NULL) { /* bad $rootdev/$currdev */ 120 printf("can't determine root device\n"); 121 return(EINVAL); 122 } 123 124 /* Try reading the /etc/fstab file to select the root device */ 125 getrootmount(devformat(rootdev)); 126 127 /* find the last module in the chain */ 128 addr = 0; 129 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 130 if (addr < (xp->f_addr + xp->f_size)) 131 addr = xp->f_addr + xp->f_size; 132 } 133 /* pad to a page boundary */ 134 addr = roundup(addr, PAGE_SIZE); 135 136 /* copy our environment */ 137 envp = addr; 138 addr = md_copyenv(addr); 139 140 /* pad to a page boundary */ 141 addr = roundup(addr, PAGE_SIZE); 142 143 kfp = file_findfile(NULL, md_kerntype); 144 if (kfp == NULL) 145 panic("can't find kernel file"); 146 kernend = 0; /* fill it in later */ 147 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto); 148 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp); 149 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend); 150 bios_addsmapdata(kfp); 151 152 /* Figure out the size and location of the metadata */ 153 *modulep = addr; 154 size = md_copymodules(0, true); 155 kernend = roundup(addr + size, PAGE_SIZE); 156 *kernendp = kernend; 157 158 /* patch MODINFOMD_KERNEND */ 159 md = file_findmetadata(kfp, MODINFOMD_KERNEND); 160 bcopy(&kernend, md->md_data, sizeof kernend); 161 162 /* copy module list and metadata */ 163 (void)md_copymodules(addr, true); 164 165 return(0); 166 } 167