bootinfo64.c revision 332154
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: stable/11/stand/userboot/userboot/bootinfo64.c 332154 2018-04-06 21:37:25Z kevans $"); 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 "libuserboot.h" 41 42/* 43 * Copy module-related data into the load area, where it can be 44 * used as a directory for loaded modules. 45 * 46 * Module data is presented in a self-describing format. Each datum 47 * is preceded by a 32-bit identifier and a 32-bit size field. 48 * 49 * Currently, the following data are saved: 50 * 51 * MOD_NAME (variable) module name (string) 52 * MOD_TYPE (variable) module type (string) 53 * MOD_ARGS (variable) module parameters (string) 54 * MOD_ADDR sizeof(vm_offset_t) module load address 55 * MOD_SIZE sizeof(size_t) module size 56 * MOD_METADATA (variable) type-specific metadata 57 */ 58#define COPY32(v, a, c) { \ 59 uint32_t x = (v); \ 60 if (c) \ 61 CALLBACK(copyin, &x, a, sizeof(x)); \ 62 a += sizeof(x); \ 63} 64 65#define MOD_STR(t, a, s, c) { \ 66 COPY32(t, a, c); \ 67 COPY32(strlen(s) + 1, a, c); \ 68 if (c) \ 69 CALLBACK(copyin, s, a, strlen(s) + 1); \ 70 a += roundup(strlen(s) + 1, sizeof(uint64_t));\ 71} 72 73#define MOD_NAME(a, s, c) MOD_STR(MODINFO_NAME, a, s, c) 74#define MOD_TYPE(a, s, c) MOD_STR(MODINFO_TYPE, a, s, c) 75#define MOD_ARGS(a, s, c) MOD_STR(MODINFO_ARGS, a, s, c) 76 77#define MOD_VAR(t, a, s, c) { \ 78 COPY32(t, a, c); \ 79 COPY32(sizeof(s), a, c); \ 80 if (c) \ 81 CALLBACK(copyin, &s, a, sizeof(s)); \ 82 a += roundup(sizeof(s), sizeof(uint64_t)); \ 83} 84 85#define MOD_ADDR(a, s, c) MOD_VAR(MODINFO_ADDR, a, s, c) 86#define MOD_SIZE(a, s, c) MOD_VAR(MODINFO_SIZE, a, s, c) 87 88#define MOD_METADATA(a, mm, c) { \ 89 COPY32(MODINFO_METADATA | mm->md_type, a, c); \ 90 COPY32(mm->md_size, a, c); \ 91 if (c) \ 92 CALLBACK(copyin, mm->md_data, a, mm->md_size); \ 93 a += roundup(mm->md_size, sizeof(uint64_t));\ 94} 95 96#define MOD_END(a, c) { \ 97 COPY32(MODINFO_END, a, c); \ 98 COPY32(0, a, c); \ 99} 100 101static vm_offset_t 102bi_copymodules64(vm_offset_t addr) 103{ 104 struct preloaded_file *fp; 105 struct file_metadata *md; 106 int c; 107 uint64_t v; 108 109 c = addr != 0; 110 /* start with the first module on the list, should be the kernel */ 111 for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) { 112 113 MOD_NAME(addr, fp->f_name, c); /* this field must come first */ 114 MOD_TYPE(addr, fp->f_type, c); 115 if (fp->f_args) 116 MOD_ARGS(addr, fp->f_args, c); 117 v = fp->f_addr; 118 MOD_ADDR(addr, v, c); 119 v = fp->f_size; 120 MOD_SIZE(addr, v, c); 121 for (md = fp->f_metadata; md != NULL; md = md->md_next) 122 if (!(md->md_type & MODINFOMD_NOCOPY)) 123 MOD_METADATA(addr, md, c); 124 } 125 MOD_END(addr, c); 126 return(addr); 127} 128 129/* 130 * Check to see if this CPU supports long mode. 131 */ 132static int 133bi_checkcpu(void) 134{ 135#if 0 136 char *cpu_vendor; 137 int vendor[3]; 138 int eflags, regs[4]; 139 140 /* Check for presence of "cpuid". */ 141 eflags = read_eflags(); 142 write_eflags(eflags ^ PSL_ID); 143 if (!((eflags ^ read_eflags()) & PSL_ID)) 144 return (0); 145 146 /* Fetch the vendor string. */ 147 do_cpuid(0, regs); 148 vendor[0] = regs[1]; 149 vendor[1] = regs[3]; 150 vendor[2] = regs[2]; 151 cpu_vendor = (char *)vendor; 152 153 /* Check for vendors that support AMD features. */ 154 if (strncmp(cpu_vendor, INTEL_VENDOR_ID, 12) != 0 && 155 strncmp(cpu_vendor, AMD_VENDOR_ID, 12) != 0 && 156 strncmp(cpu_vendor, CENTAUR_VENDOR_ID, 12) != 0) 157 return (0); 158 159 /* Has to support AMD features. */ 160 do_cpuid(0x80000000, regs); 161 if (!(regs[0] >= 0x80000001)) 162 return (0); 163 164 /* Check for long mode. */ 165 do_cpuid(0x80000001, regs); 166 return (regs[3] & AMDID_LM); 167#else 168 return (1); 169#endif 170} 171 172/* 173 * Load the information expected by an amd64 kernel. 174 * 175 * - The 'boothowto' argument is constructed 176 * - The 'bootdev' argument is constructed 177 * - The 'bootinfo' struct is constructed, and copied into the kernel space. 178 * - The kernel environment is copied into kernel space. 179 * - Module metadata are formatted and placed in kernel space. 180 */ 181int 182bi_load64(char *args, vm_offset_t *modulep, vm_offset_t *kernendp) 183{ 184 struct preloaded_file *xp, *kfp; 185 struct userboot_devdesc *rootdev; 186 struct file_metadata *md; 187 vm_offset_t addr; 188 uint64_t kernend; 189 uint64_t envp; 190 vm_offset_t size; 191 char *rootdevname; 192 int howto; 193 194 if (!bi_checkcpu()) { 195 printf("CPU doesn't support long mode\n"); 196 return (EINVAL); 197 } 198 199 howto = bi_getboothowto(args); 200 201 /* 202 * Allow the environment variable 'rootdev' to override the supplied device 203 * This should perhaps go to MI code and/or have $rootdev tested/set by 204 * MI code before launching the kernel. 205 */ 206 rootdevname = getenv("rootdev"); 207 userboot_getdev((void **)(&rootdev), rootdevname, NULL); 208 if (rootdev == NULL) { /* bad $rootdev/$currdev */ 209 printf("can't determine root device\n"); 210 return(EINVAL); 211 } 212 213 /* Try reading the /etc/fstab file to select the root device */ 214 getrootmount(userboot_fmtdev((void *)rootdev)); 215 216 /* find the last module in the chain */ 217 addr = 0; 218 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 219 if (addr < (xp->f_addr + xp->f_size)) 220 addr = xp->f_addr + xp->f_size; 221 } 222 /* pad to a page boundary */ 223 addr = roundup(addr, PAGE_SIZE); 224 225 /* copy our environment */ 226 envp = addr; 227 addr = bi_copyenv(addr); 228 229 /* pad to a page boundary */ 230 addr = roundup(addr, PAGE_SIZE); 231 232 kfp = file_findfile(NULL, "elf kernel"); 233 if (kfp == NULL) 234 kfp = file_findfile(NULL, "elf64 kernel"); 235 if (kfp == NULL) 236 panic("can't find kernel file"); 237 kernend = 0; /* fill it in later */ 238 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto); 239 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp); 240 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend); 241 bios_addsmapdata(kfp); 242 243 /* Figure out the size and location of the metadata */ 244 *modulep = addr; 245 size = bi_copymodules64(0); 246 kernend = roundup(addr + size, PAGE_SIZE); 247 *kernendp = kernend; 248 249 /* patch MODINFOMD_KERNEND */ 250 md = file_findmetadata(kfp, MODINFOMD_KERNEND); 251 bcopy(&kernend, md->md_data, sizeof kernend); 252 253 /* copy module list and metadata */ 254 (void)bi_copymodules64(addr); 255 256 return(0); 257} 258