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

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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 * $FreeBSD: head/sys/boot/i386/libi386/elf64_freebsd.c 114379 2003-05-01 03:56:30Z peter $
27 */
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
42static int elf64_exec(struct preloaded_file *amp);
43
44struct file_format amd64_elf = { elf64_loadfile, elf64_exec };
45
46#define PG_V 0x001
47#define PG_RW 0x002
48#define PG_U 0x004
49#define PG_PS 0x080
50
51typedef u_int64_t p4_entry_t;
52typedef u_int64_t p3_entry_t;
53typedef u_int64_t p2_entry_t;
54extern p4_entry_t PT4[];
55extern p3_entry_t PT3[];
56extern p2_entry_t PT2[];
57
58u_int32_t entry_hi;
59u_int32_t entry_lo;
60
61extern amd64_tramp();
62
63/*
64 * There is an a.out kernel and one or more a.out modules loaded.
65 * We wish to start executing the kernel image, so make such
66 * preparations as are required, and do so.
67 */
68static int
69elf64_exec(struct preloaded_file *fp)
70{
71 struct file_metadata *md;
72 Elf_Ehdr *ehdr;
73 vm_offset_t modulep, kernend;
74 int err;
75 int i;
76
77 if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
78 return(EFTYPE); /* XXX actually EFUCKUP */
79 ehdr = (Elf_Ehdr *)&(md->md_data);
80
81 err = bi_load64(fp->f_args, &modulep, &kernend);
82 if (err != 0)
83 return(err);
84
85 bzero(PT4, PAGE_SIZE);
86 bzero(PT3, PAGE_SIZE);
87 bzero(PT2, PAGE_SIZE);
88
89 /* single PML4 entry */
90 PT4[0] = (p4_entry_t)VTOP((uintptr_t)&PT3[0]);
91 PT4[0] |= PG_V | PG_RW | PG_U;
92
93 /* Direct map 1GB at address zero */
94 PT3[0] = (p3_entry_t)VTOP((uintptr_t)&PT2[0]);
95 PT3[0] |= PG_V | PG_RW | PG_U;
96
97 /* Direct map 1GB at KERNBASE (hardcoded for now) */
98 PT3[1] = (p3_entry_t)VTOP((uintptr_t)&PT2[0]);
99 PT3[1] |= PG_V | PG_RW | PG_U;
100
101 /* 512 PG_PS (2MB) page mappings for 1GB of direct mapping */
102 for (i = 0; i < 512; i++) {
103 PT2[i] = i * (2 * 1024 * 1024);
104 PT2[i] |= PG_V | PG_RW | PG_PS | PG_U;
105 }
106
107 entry_lo = ehdr->e_entry & 0xffffffff;
108 entry_hi = (ehdr->e_entry >> 32) & 0xffffffff;
109#ifdef DEBUG
110 printf("Start @ %#llx ...\n", ehdr->e_entry);
111#endif
112
113 dev_cleanup();
114 __exec((void *)VTOP(amd64_tramp), modulep, kernend);
115
116 panic("exec returned");
117}