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 #define __ELF_WORD_SIZE 64
28 #include <sys/param.h>
29 #include <sys/exec.h>
30 #include <sys/linker.h>
31 #include <string.h>
32 #include <machine/bootinfo.h>
33 #include <machine/elf.h>
34 #include <stand.h>
35
36 #include "bootstrap.h"
37 #include "libi386.h"
38 #include "btxv86.h"
39
40 static int elf64_exec(struct preloaded_file *amp);
41 static int elf64_obj_exec(struct preloaded_file *amp);
42
43 struct file_format amd64_elf = { elf64_loadfile, elf64_exec };
44 struct file_format amd64_elf_obj = { elf64_obj_loadfile, elf64_obj_exec };
45
46 #define PG_V 0x001
47 #define PG_RW 0x002
48 #define PG_PS 0x080
49
50 typedef uint64_t p4_entry_t;
51 typedef uint64_t p3_entry_t;
52 typedef uint64_t p2_entry_t;
53 extern p4_entry_t PT4[];
54 extern p3_entry_t PT3[];
55 extern p2_entry_t PT2[];
56
57 uint32_t entry_hi;
58 uint32_t entry_lo;
59
60 extern void amd64_tramp();
61
62 /*
63 * There is an ELF kernel and one or more ELF modules loaded.
64 * We wish to start executing the kernel image, so make such
65 * preparations as are required, and do so.
66 */
67 static int
elf64_exec(struct preloaded_file * fp)68 elf64_exec(struct preloaded_file *fp)
69 {
70 struct file_metadata *md;
71 Elf_Ehdr *ehdr;
72 vm_offset_t modulep, kernend;
73 int err;
74 int i;
75
76 if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
77 return(EFTYPE);
78 ehdr = (Elf_Ehdr *)&(md->md_data);
79
80 err = bi_load64(fp->f_args, &modulep, &kernend, 1);
81 if (err != 0)
82 return(err);
83
84 bzero(PT4, PAGE_SIZE);
85 bzero(PT3, PAGE_SIZE);
86 bzero(PT2, PAGE_SIZE);
87
88 /*
89 * This is kinda brutal, but every single 1GB VM memory segment points to
90 * the same first 1GB of physical memory. But it is more than adequate.
91 */
92 for (i = 0; i < 512; i++) {
93 /* Each slot of the level 4 pages points to the same level 3 page */
94 PT4[i] = (p4_entry_t)VTOP((uintptr_t)&PT3[0]);
95 PT4[i] |= PG_V | PG_RW;
96
97 /* Each slot of the level 3 pages points to the same level 2 page */
98 PT3[i] = (p3_entry_t)VTOP((uintptr_t)&PT2[0]);
99 PT3[i] |= PG_V | PG_RW;
100
101 /* The level 2 page slots are mapped with 2MB pages for 1GB. */
102 PT2[i] = i * (2 * 1024 * 1024);
103 PT2[i] |= PG_V | PG_RW | PG_PS;
104 }
105
106 entry_lo = ehdr->e_entry & 0xffffffff;
107 entry_hi = (ehdr->e_entry >> 32) & 0xffffffff;
108 #ifdef DEBUG
109 printf("Start @ %#llx ...\n", ehdr->e_entry);
110 #endif
111
112 dev_cleanup();
113 __exec((void *)VTOP(amd64_tramp), modulep, kernend);
114
115 panic("exec returned");
116 }
117
118 static int
elf64_obj_exec(struct preloaded_file * fp)119 elf64_obj_exec(struct preloaded_file *fp)
120 {
121 return (EFTYPE);
122 }
123