1 /*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * Copyright (c) 2014 The FreeBSD Foundation
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #define __ELF_WORD_SIZE 64
32 #include <sys/param.h>
33 #include <sys/exec.h>
34 #include <sys/linker.h>
35 #include <string.h>
36 #include <machine/elf.h>
37 #include <stand.h>
38
39 #include <efi.h>
40 #include <efilib.h>
41
42 #include "bootstrap.h"
43
44 #include "platform/acfreebsd.h"
45 #include "acconfig.h"
46 #define ACPI_SYSTEM_XFACE
47 #include "actypes.h"
48 #include "actbl.h"
49
50 #include "loader_efi.h"
51
52 static EFI_GUID acpi_guid = ACPI_TABLE_GUID;
53 static EFI_GUID acpi20_guid = ACPI_20_TABLE_GUID;
54
55 extern int bi_load(char *args, vm_offset_t *modulep, vm_offset_t *kernendp);
56
57 static int elf64_exec(struct preloaded_file *amp);
58 static int elf64_obj_exec(struct preloaded_file *amp);
59
60 static struct file_format amd64_elf = { elf64_loadfile, elf64_exec };
61 static struct file_format amd64_elf_obj = { elf64_obj_loadfile, elf64_obj_exec };
62
63 struct file_format *file_formats[] = {
64 &amd64_elf,
65 &amd64_elf_obj,
66 NULL
67 };
68
69 #define PG_V 0x001
70 #define PG_RW 0x002
71 #define PG_U 0x004
72 #define PG_PS 0x080
73
74 typedef u_int64_t p4_entry_t;
75 typedef u_int64_t p3_entry_t;
76 typedef u_int64_t p2_entry_t;
77 static p4_entry_t *PT4;
78 static p3_entry_t *PT3;
79 static p2_entry_t *PT2;
80
81 static void (*trampoline)(uint64_t stack, void *copy_finish, uint64_t kernend,
82 uint64_t modulep, p4_entry_t *pagetable,
83 uint64_t entry);
84
85 extern uintptr_t amd64_tramp;
86 extern uint32_t amd64_tramp_size;
87
88 /*
89 * There is an ELF kernel and one or more ELF modules loaded.
90 * We wish to start executing the kernel image, so make such
91 * preparations as are required, and do so.
92 */
93 static int
elf64_exec(struct preloaded_file * fp)94 elf64_exec(struct preloaded_file *fp)
95 {
96 struct file_metadata *md;
97 Elf_Ehdr *ehdr;
98 vm_offset_t modulep, kernend, trampcode, trampstack;
99 int err, i;
100 ACPI_TABLE_RSDP *rsdp;
101 char buf[24];
102 int revision;
103 EFI_STATUS status;
104
105 rsdp = efi_get_table(&acpi20_guid);
106 if (rsdp == NULL) {
107 rsdp = efi_get_table(&acpi_guid);
108 }
109 if (rsdp != NULL) {
110 sprintf(buf, "0x%016llx", (unsigned long long)rsdp);
111 setenv("hint.acpi.0.rsdp", buf, 1);
112 revision = rsdp->Revision;
113 if (revision == 0)
114 revision = 1;
115 sprintf(buf, "%d", revision);
116 setenv("hint.acpi.0.revision", buf, 1);
117 strncpy(buf, rsdp->OemId, sizeof(rsdp->OemId));
118 buf[sizeof(rsdp->OemId)] = '\0';
119 setenv("hint.acpi.0.oem", buf, 1);
120 sprintf(buf, "0x%016x", rsdp->RsdtPhysicalAddress);
121 setenv("hint.acpi.0.rsdt", buf, 1);
122 if (revision >= 2) {
123 /* XXX extended checksum? */
124 sprintf(buf, "0x%016llx",
125 (unsigned long long)rsdp->XsdtPhysicalAddress);
126 setenv("hint.acpi.0.xsdt", buf, 1);
127 sprintf(buf, "%d", rsdp->Length);
128 setenv("hint.acpi.0.xsdt_length", buf, 1);
129 }
130 }
131
132 if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
133 return(EFTYPE);
134 ehdr = (Elf_Ehdr *)&(md->md_data);
135
136 trampcode = (vm_offset_t)0x0000000040000000;
137 err = BS->AllocatePages(AllocateMaxAddress, EfiLoaderData, 1,
138 (EFI_PHYSICAL_ADDRESS *)&trampcode);
139 bzero((void *)trampcode, EFI_PAGE_SIZE);
140 trampstack = trampcode + EFI_PAGE_SIZE - 8;
141 bcopy((void *)&amd64_tramp, (void *)trampcode, amd64_tramp_size);
142 trampoline = (void *)trampcode;
143
144 PT4 = (p4_entry_t *)0x0000000040000000;
145 err = BS->AllocatePages(AllocateMaxAddress, EfiLoaderData, 3,
146 (EFI_PHYSICAL_ADDRESS *)&PT4);
147 bzero(PT4, 3 * EFI_PAGE_SIZE);
148
149 PT3 = &PT4[512];
150 PT2 = &PT3[512];
151
152 /*
153 * This is kinda brutal, but every single 1GB VM memory segment points
154 * to the same first 1GB of physical memory. But it is more than
155 * adequate.
156 */
157 for (i = 0; i < 512; i++) {
158 /* Each slot of the L4 pages points to the same L3 page. */
159 PT4[i] = (p4_entry_t)PT3;
160 PT4[i] |= PG_V | PG_RW | PG_U;
161
162 /* Each slot of the L3 pages points to the same L2 page. */
163 PT3[i] = (p3_entry_t)PT2;
164 PT3[i] |= PG_V | PG_RW | PG_U;
165
166 /* The L2 page slots are mapped with 2MB pages for 1GB. */
167 PT2[i] = i * (2 * 1024 * 1024);
168 PT2[i] |= PG_V | PG_RW | PG_PS | PG_U;
169 }
170
171 printf("Start @ 0x%lx ...\n", ehdr->e_entry);
172
173 err = bi_load(fp->f_args, &modulep, &kernend);
174 if (err != 0)
175 return(err);
176
177 dev_cleanup();
178
179 trampoline(trampstack, efi_copy_finish, kernend, modulep, PT4,
180 ehdr->e_entry);
181
182 panic("exec returned");
183 }
184
185 static int
elf64_obj_exec(struct preloaded_file * fp)186 elf64_obj_exec(struct preloaded_file *fp)
187 {
188 return (EFTYPE);
189 }
190