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 <vm/vm.h>
32 #include <vm/pmap.h>
33 #include <string.h>
34 #include <machine/bootinfo.h>
35 #include <machine/pmap_pae.h>
36 #include <machine/elf.h>
37 #include <stand.h>
38
39 #include "bootstrap.h"
40 #include "libi386.h"
41 #include "btxv86.h"
42
43 static int elf64_exec(struct preloaded_file *amp);
44 static int elf64_obj_exec(struct preloaded_file *amp);
45
46 struct file_format amd64_elf = { elf64_loadfile, elf64_exec };
47 struct file_format amd64_elf_obj = { elf64_obj_loadfile, elf64_obj_exec };
48
49 /*
50 * i386's pmap_pae.h doesn't provide this, so
51 * just typedef our own.
52 */
53 typedef pdpt_entry_t pml4_entry_t;
54
55 extern pml4_entry_t PT4[];
56 extern pdpt_entry_t PT3[];
57 extern pd_entry_t PT2[];
58
59 uint32_t entry_hi;
60 uint32_t entry_lo;
61
62 extern void amd64_tramp();
63
64 /*
65 * There is an ELF kernel and one or more ELF modules loaded.
66 * We wish to start executing the kernel image, so make such
67 * preparations as are required, and do so.
68 */
69 static int
elf64_exec(struct preloaded_file * fp)70 elf64_exec(struct preloaded_file *fp)
71 {
72 struct file_metadata *md;
73 Elf_Ehdr *ehdr;
74 vm_offset_t modulep, kernend;
75 int err;
76 int i;
77
78 if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
79 return(EFTYPE);
80 ehdr = (Elf_Ehdr *)&(md->md_data);
81
82 err = bi_load64(fp->f_args, &modulep, &kernend, 1);
83 if (err != 0)
84 return(err);
85
86 bzero(PT4, PAGE_SIZE);
87 bzero(PT3, PAGE_SIZE);
88 bzero(PT2, PAGE_SIZE);
89
90 /*
91 * This is kinda brutal, but every single 1GB VM memory segment points to
92 * the same first 1GB of physical memory. But it is more than adequate.
93 */
94 for (i = 0; i < 512; i++) {
95 /* Each slot of the level 4 pages points to the same level 3 page */
96 PT4[i] = (pml4_entry_t)VTOP((uintptr_t)&PT3[0]);
97 PT4[i] |= PG_V | PG_RW;
98
99 /* Each slot of the level 3 pages points to the same level 2 page */
100 PT3[i] = (pdpt_entry_t)VTOP((uintptr_t)&PT2[0]);
101 PT3[i] |= PG_V | PG_RW;
102
103 /* The level 2 page slots are mapped with 2MB pages for 1GB. */
104 PT2[i] = i * (2 * 1024 * 1024);
105 PT2[i] |= PG_V | PG_RW | PG_PS;
106 }
107
108 entry_lo = ehdr->e_entry & 0xffffffff;
109 entry_hi = (ehdr->e_entry >> 32) & 0xffffffff;
110 #ifdef DEBUG
111 printf("Start @ %#llx ...\n", ehdr->e_entry);
112 #endif
113
114 dev_cleanup();
115 __exec((void *)VTOP(amd64_tramp), modulep, kernend);
116
117 panic("exec returned");
118 }
119
120 static int
elf64_obj_exec(struct preloaded_file * fp)121 elf64_obj_exec(struct preloaded_file *fp)
122 {
123 return (EFTYPE);
124 }
125