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
29 #define __ELF_WORD_SIZE 64
30 #include <sys/param.h>
31 #include <sys/exec.h>
32 #include <sys/linker.h>
33 #include <string.h>
34 #include <machine/bootinfo.h>
35 #include <machine/elf.h>
36 #include <stand.h>
37
38 #include "bootstrap.h"
39 #include "libi386.h"
40 #include "btxv86.h"
41
42 static int elf64_exec(struct preloaded_file *amp);
43 static int elf64_obj_exec(struct preloaded_file *amp);
44
45 struct file_format amd64_elf = { elf64_loadfile, elf64_exec };
46 struct file_format amd64_elf_obj = { elf64_obj_loadfile, elf64_obj_exec };
47
48 #define PG_V 0x001
49 #define PG_RW 0x002
50 #define PG_U 0x004
51 #define PG_PS 0x080
52
53 typedef u_int64_t p4_entry_t;
54 typedef u_int64_t p3_entry_t;
55 typedef u_int64_t p2_entry_t;
56 extern p4_entry_t PT4[];
57 extern p3_entry_t PT3[];
58 extern p2_entry_t PT2[];
59
60 u_int32_t entry_hi;
61 u_int32_t entry_lo;
62
63 extern void amd64_tramp();
64
65 /*
66 * There is an ELF kernel and one or more ELF modules loaded.
67 * We wish to start executing the kernel image, so make such
68 * preparations as are required, and do so.
69 */
70 static int
elf64_exec(struct preloaded_file * fp)71 elf64_exec(struct preloaded_file *fp)
72 {
73 struct file_metadata *md;
74 Elf_Ehdr *ehdr;
75 vm_offset_t modulep, kernend;
76 int err;
77 int i;
78
79 if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
80 return(EFTYPE);
81 ehdr = (Elf_Ehdr *)&(md->md_data);
82
83 err = bi_load64(fp->f_args, 0, &modulep, &kernend, 1);
84 if (err != 0)
85 return(err);
86
87 bzero(PT4, PAGE_SIZE);
88 bzero(PT3, PAGE_SIZE);
89 bzero(PT2, PAGE_SIZE);
90
91 /*
92 * This is kinda brutal, but every single 1GB VM memory segment points to
93 * the same first 1GB of physical memory. But it is more than adequate.
94 */
95 for (i = 0; i < 512; i++) {
96 /* Each slot of the level 4 pages points to the same level 3 page */
97 PT4[i] = (p4_entry_t)VTOP((uintptr_t)&PT3[0]);
98 PT4[i] |= PG_V | PG_RW | PG_U;
99
100 /* Each slot of the level 3 pages points to the same level 2 page */
101 PT3[i] = (p3_entry_t)VTOP((uintptr_t)&PT2[0]);
102 PT3[i] |= PG_V | PG_RW | PG_U;
103
104 /* The level 2 page slots are mapped with 2MB pages for 1GB. */
105 PT2[i] = i * (2 * 1024 * 1024);
106 PT2[i] |= PG_V | PG_RW | PG_PS | PG_U;
107 }
108
109 entry_lo = ehdr->e_entry & 0xffffffff;
110 entry_hi = (ehdr->e_entry >> 32) & 0xffffffff;
111 #ifdef DEBUG
112 printf("Start @ %#llx ...\n", ehdr->e_entry);
113 #endif
114
115 dev_cleanup();
116 __exec((void *)VTOP(amd64_tramp), modulep, kernend);
117
118 panic("exec returned");
119 }
120
121 static int
elf64_obj_exec(struct preloaded_file * fp __unused)122 elf64_obj_exec(struct preloaded_file *fp __unused)
123 {
124 return (EFTYPE);
125 }
126