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
bi_checkcpu(void)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
bi_load64(char * args,vm_offset_t * modulep,vm_offset_t * kernendp,int add_smap)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