source: mainline/arch/amd64/src/boot/boot.S@ 085d973

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 085d973 was 65640fef, checked in by Ondrej Palkovsky <ondrap@…>, 20 years ago

I'm unsure if simics is broken or the only one according to spec,
but SYSCALL now works even with simics.
  • Property mode set to 100644
File size: 8.4 KB
Line 
1#
2# Copyright (C) 2005 Ondrej Palkovsky
3# Copyright (C) 2006 Martin Decky
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#
10# - Redistributions of source code must retain the above copyright
11# notice, this list of conditions and the following disclaimer.
12# - Redistributions in binary form must reproduce the above copyright
13# notice, this list of conditions and the following disclaimer in the
14# documentation and/or other materials provided with the distribution.
15# - The name of the author may not be used to endorse or promote products
16# derived from this software without specific prior written permission.
17#
18# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28#
29
30#include <arch/boot/boot.h>
31#include <arch/boot/memmap.h>
32#include <arch/mm/page.h>
33#include <arch/mm/ptl.h>
34#include <arch/pm.h>
35#include <arch/cpu.h>
36#include <arch/cpuid.h>
37
38#define START_STACK (BOOT_OFFSET - BOOT_STACK_SIZE)
39
40.section K_TEXT_START, "ax"
41
42.code32
43.align 4
44.global multiboot_image_start
45multiboot_header:
46 .long MULTIBOOT_HEADER_MAGIC
47 .long MULTIBOOT_HEADER_FLAGS
48 .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum
49 .long multiboot_header
50 .long unmapped_ktext_start
51 .long 0
52 .long 0
53 .long multiboot_image_start
54
55multiboot_image_start:
56 movl $START_STACK, %esp # initialize stack pointer
57 lgdt bootstrap_gdtr # initialize Global Descriptor Table register
58
59 movw $gdtselector(KDATA_DES), %cx
60 movw %cx, %es
61 movw %cx, %ds # kernel data + stack
62 movw %cx, %ss
63 # Simics seems to remove hidden part of GS on entering user mode
64 # when _visible_ part of GS does not point to user-mode segment
65 movw $gdtselector(UDATA_DES), %cx
66 movw %cx, %fs
67 movw %cx, %gs
68
69 jmpl $gdtselector(KTEXT32_DES), $multiboot_meeting_point
70 multiboot_meeting_point:
71
72 movl %eax, grub_eax # save parameters from GRUB
73 movl %ebx, grub_ebx
74
75 # Protected 32-bit. We want to reuse the code-seg descriptor,
76 # the Default operand size must not be 1 when entering long mode
77
78 movl $0x80000000, %eax
79 cpuid
80 cmp $0x80000000, %eax # any function > 80000000h?
81 jbe long_mode_unsupported
82 movl $(AMD_CPUID_EXTENDED), %eax # Extended function code 80000001
83 cpuid
84 bt $29, %edx # Test if long mode is supported.
85 jc long_mode_supported
86
87 long_mode_unsupported:
88 cli
89 hlt
90
91 long_mode_supported:
92
93 # Enable 64-bit page transaltion entries - CR4.PAE = 1.
94 # Paging is not enabled until after long mode is enabled
95
96 movl %cr4, %eax
97 btsl $5, %eax
98 movl %eax, %cr4
99
100 # Set up paging tables
101
102 leal ptl_0, %eax
103 movl %eax, %cr3
104
105 # Enable long mode
106
107 movl $EFER_MSR_NUM, %ecx # EFER MSR number
108 rdmsr # Read EFER
109 btsl $AMD_LME_FLAG, %eax # Set LME=1
110 wrmsr # Write EFER
111
112 # Enable paging to activate long mode (set CR0.PG=1)
113
114 movl %cr0, %eax
115 btsl $31, %eax
116 movl %eax, %cr0
117
118 # At this point we are in compatibility mode
119
120 jmpl $gdtselector(KTEXT_DES), $start64
121
122.code64
123start64:
124 movq $(PA2KA(START_STACK)), %rsp
125 movl grub_eax, %eax
126 movl grub_ebx, %ebx
127
128 cmpl $MULTIBOOT_LOADER_MAGIC, %eax # compare GRUB signature
129 je valid_boot
130
131 xorl %ecx, %ecx # no memory size or map available
132 movl %ecx, e801memorysize
133 movl %ecx, e820counter
134
135 jmp invalid_boot
136
137 valid_boot:
138
139 movl (%ebx), %eax # ebx = physical address of struct multiboot_info
140
141 bt $0, %eax # mbi->flags[0] (mem_lower, mem_upper valid)
142 jc mem_valid
143
144 xorl %ecx, %ecx
145 jmp mem_invalid
146
147 mem_valid:
148 movl 4(%ebx), %ecx # mbi->mem_lower
149 addl 8(%ebx), %ecx # mbi->mem_upper
150
151 mem_invalid:
152 movl %ecx, e801memorysize
153
154 bt $3, %eax # mbi->flags[3] (mods_count, mods_addr valid)
155 jc mods_valid
156
157 xorl %ecx, %ecx
158 xorl %edx, %edx
159 jmp mods_invalid
160
161 mods_valid:
162 movl 20(%ebx), %ecx # mbi->mods_count
163 cmpl $0, %ecx
164 je mods_invalid
165
166 xorq %rdx, %rdx
167 movl 24(%ebx), %esi # mbi->mods_addr
168 movl 0(%esi), %edx # mods->mod_start
169 movl 4(%esi), %ecx # mods->mod_end
170 subl %edx, %ecx
171 addq $0xffffffff80000000, %rdx
172
173 mods_invalid:
174 movl %ecx, init_size
175 movq %rdx, init_addr
176
177 bt $6, %eax # mbi->flags[6] (mmap_length, mmap_addr valid)
178 jc mmap_valid
179
180 xorl %edx, %edx
181 jmp mmap_invalid
182
183 mmap_valid:
184 movl 44(%ebx), %ecx # mbi->mmap_length
185 movl 48(%ebx), %esi # mbi->mmap_addr
186 movq $e820table, %rdi
187 xorl %edx, %edx
188
189 mmap_loop:
190 cmpl $0, %ecx
191 jle mmap_end
192
193 movl 4(%esi), %eax # mmap->base_addr_low
194 movl %eax, (%rdi)
195
196 movl 8(%esi), %eax # mmap->base_addr_high
197 movl %eax, 4(%rdi)
198
199 movl 12(%esi), %eax # mmap->length_low
200 movl %eax, 8(%rdi)
201
202 movl 16(%esi), %eax # mmap->length_high
203 movl %eax, 12(%rdi)
204
205 movl 20(%esi), %eax # mmap->type
206 movl %eax, 16(%rdi)
207
208 movl (%esi), %eax # mmap->size
209 addl $0x4, %eax
210 addl %eax, %esi
211 subl %eax, %ecx
212 addq $MEMMAP_E820_RECORD_SIZE, %rdi
213 incl %edx
214 jmp mmap_loop
215
216 mmap_end:
217
218 mmap_invalid:
219 movl %edx, e820counter
220
221 invalid_boot:
222
223#ifdef CONFIG_SMP
224
225 # copy AP bootstrap routines below 1 MB
226
227 movq $BOOT_OFFSET, %rsi
228 movq $AP_BOOT_OFFSET, %rdi
229 movq $_hardcoded_unmapped_size, %rcx
230 cld
231 rep movsb
232
233#endif
234
235 call main_bsp # never returns
236
237 cli
238 hlt
239
240.section K_DATA_START, "aw", @progbits
241.align 4096
242
243# Identical mapping of first 64MB and the same of -2GB -> 0
244.global ptl_2
245ptl_2:
246 .quad 0x0 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
247 .quad 0x200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
248 .quad 0x400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
249 .quad 0x600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
250 .quad 0x800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
251 .quad 0xa00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
252 .quad 0xc00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
253 .quad 0xe00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
254 .quad 0x1000000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
255 .quad 0x1200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
256 .quad 0x1400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
257 .quad 0x1600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
258 .quad 0x1800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
259 .quad 0x1a00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
260 .quad 0x1c00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
261 .quad 0x1e00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
262 .quad 0x2000000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
263 .quad 0x2200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
264 .quad 0x2400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
265 .quad 0x2600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
266 .quad 0x2800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
267 .quad 0x2a00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
268 .quad 0x2c00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
269 .quad 0x2e00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
270 .quad 0x3000000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
271 .quad 0x3200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
272 .quad 0x3400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
273 .quad 0x3600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
274 .quad 0x3800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
275 .quad 0x3a00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
276 .quad 0x3c00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
277 .quad 0x3e00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
278
279.align 4096
280.global ptl_1
281ptl_1:
282 .quad ptl_2 + (PTL_WRITABLE | PTL_PRESENT)
283 .fill 509,8,0
284 .quad ptl_2 + (PTL_WRITABLE | PTL_PRESENT)
285 .fill 1,8,0
286
287.align 4096
288.global ptl_0
289ptl_0:
290 .quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
291 .fill 510,8,0
292 .quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
293
294.global bootstrap_gdtr
295bootstrap_gdtr:
296 .word gdtselector(GDT_ITEMS)
297 .long KA2PA(gdt)
298
299grub_eax:
300 .long 0
301
302grub_ebx:
303 .long 0
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