2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
26 * $FreeBSD: src/sys/boot/i386/libi386/elf64_freebsd.c,v 1.14 2003/08/25 23:28:31 obrien Exp $
27 * $DragonFly: src/sys/boot/pc32/libi386/elf64_freebsd.c,v 1.1 2003/11/10 06:08:36 dillon Exp $
30 #define __ELF_WORD_SIZE 64
31 #include <sys/param.h>
33 #include <sys/linker.h>
35 #include <machine/bootinfo.h>
36 #include <machine/elf.h>
39 #include "bootstrap.h"
43 static int elf64_exec(struct preloaded_file *amp);
45 struct file_format amd64_elf = { elf64_loadfile, elf64_exec };
52 typedef u_int64_t p4_entry_t;
53 typedef u_int64_t p3_entry_t;
54 typedef u_int64_t p2_entry_t;
55 extern p4_entry_t PT4[];
56 extern p3_entry_t PT3[];
57 extern p2_entry_t PT2[];
65 * There is an a.out kernel and one or more a.out modules loaded.
66 * We wish to start executing the kernel image, so make such
67 * preparations as are required, and do so.
70 elf64_exec(struct preloaded_file *fp)
72 struct file_metadata *md;
74 vm_offset_t modulep, kernend;
78 if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
79 return(EFTYPE); /* XXX actually EFUCKUP */
80 ehdr = (Elf_Ehdr *)&(md->md_data);
82 err = bi_load64(fp->f_args, &modulep, &kernend);
86 bzero(PT4, PAGE_SIZE);
87 bzero(PT3, PAGE_SIZE);
88 bzero(PT2, PAGE_SIZE);
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.
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] = (p4_entry_t)VTOP((uintptr_t)&PT3[0]);
97 PT4[i] |= PG_V | PG_RW | PG_U;
99 /* Each slot of the level 3 pages points to the same level 2 page */
100 PT3[i] = (p3_entry_t)VTOP((uintptr_t)&PT2[0]);
101 PT3[i] |= PG_V | PG_RW | PG_U;
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 | PG_U;
108 entry_lo = ehdr->e_entry & 0xffffffff;
109 entry_hi = (ehdr->e_entry >> 32) & 0xffffffff;
111 printf("Start @ %#llx ...\n", ehdr->e_entry);
115 __exec((void *)VTOP(amd64_tramp), modulep, kernend);
117 panic("exec returned");