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
40static int	elf64_exec(struct preloaded_file *amp);
41static int	elf64_obj_exec(struct preloaded_file *amp);
42
43struct file_format amd64_elf = { elf64_loadfile, elf64_exec };
44struct 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
50typedef uint64_t p4_entry_t;
51typedef uint64_t p3_entry_t;
52typedef uint64_t p2_entry_t;
53extern p4_entry_t PT4[];
54extern p3_entry_t PT3[];
55extern p2_entry_t PT2[];
56
57uint32_t entry_hi;
58uint32_t entry_lo;
59
60extern 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 */
67static int
68elf64_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
118static int
119elf64_obj_exec(struct preloaded_file *fp)
120{
121	return (EFTYPE);
122}
123