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164 palkovsky 1
#
288 jermar 2
# Copyright (C) 2005 Ondrej Palkovsky
696 decky 3
# Copyright (C) 2006 Martin Decky
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# - Redistributions of source code must retain the above copyright
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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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695 decky 30
#include <arch/boot/boot.h>
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#include <arch/boot/memmap.h>
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#include <arch/mm/page.h>	
188 palkovsky 33
#include <arch/mm/ptl.h>
194 palkovsky 34
#include <arch/pm.h>
251 palkovsky 35
#include <arch/cpu.h>
275 palkovsky 36
#include <arch/cpuid.h>
164 palkovsky 37
 
694 decky 38
#define START_STACK	(BOOT_OFFSET - BOOT_STACK_SIZE)
275 palkovsky 39
 
406 jermar 40
.section K_TEXT_START, "ax"
695 decky 41
 
680 decky 42
.code32
43
.align 4
695 decky 44
.global multiboot_image_start
680 decky 45
multiboot_header:
46
	.long MULTIBOOT_HEADER_MAGIC
47
	.long MULTIBOOT_HEADER_FLAGS
48
	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)	# checksum
694 decky 49
	.long multiboot_header
50
	.long unmapped_ktext_start
680 decky 51
	.long 0
52
	.long 0
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	.long multiboot_image_start
188 palkovsky 54
 
680 decky 55
multiboot_image_start:
695 decky 56
	movl $START_STACK, %esp			# initialize stack pointer
57
	lgdt bootstrap_gdtr				# initialize Global Descriptor Table register
680 decky 58
 
685 decky 59
	movw $gdtselector(KDATA_DES), %cx
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	movw %cx, %es
61
	movw %cx, %ds							# kernel data + stack
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	movw %cx, %ss
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	# Simics seems to remove hidden part of GS on entering user mode
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	#  when _visible_ part of GS does not point to user-mode segment
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	movw $gdtselector(UDATA_DES), %cx
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	movw %cx, %fs
67
	movw %cx, %gs
685 decky 68
 
695 decky 69
	jmpl $gdtselector(KTEXT32_DES), $multiboot_meeting_point
685 decky 70
	multiboot_meeting_point:
71
 
695 decky 72
	movl %eax, grub_eax							# save parameters from GRUB
73
	movl %ebx, grub_ebx
74
 
694 decky 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
275 palkovsky 77
 
696 decky 78
	movl $0x80000000, %eax  
79
 	cpuid
80
 	cmp $0x80000000, %eax						# any function > 80000000h?
81
	jbe long_mode_unsupported
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	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
 
188 palkovsky 93
	# Enable 64-bit page transaltion entries - CR4.PAE = 1.
94
	# Paging is not enabled until after long mode is enabled
694 decky 95
 
188 palkovsky 96
	movl %cr4, %eax
97
	btsl $5, %eax
98
	movl %eax, %cr4
99
 
100
	# Set up paging tables
694 decky 101
 
188 palkovsky 102
	leal ptl_0, %eax
103
	movl %eax, %cr3
275 palkovsky 104
 
188 palkovsky 105
	# Enable long mode
178 palkovsky 106
 
694 decky 107
	movl $EFER_MSR_NUM, %ecx	# EFER MSR number
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	rdmsr						# Read EFER
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	btsl $AMD_LME_FLAG, %eax	# Set LME=1
110
	wrmsr						# Write EFER
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188 palkovsky 112
	# Enable paging to activate long mode (set CR0.PG=1)
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188 palkovsky 114
	movl %cr0, %eax
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	btsl $31, %eax
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	movl %eax, %cr0
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118
	# At this point we are in compatibility mode
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206 palkovsky 120
	jmpl $gdtselector(KTEXT_DES), $start64
164 palkovsky 121
 
188 palkovsky 122
.code64
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start64:
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	movq $(PA2KA(START_STACK)), %rsp
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	movl grub_eax, %eax
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	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
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		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
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			jmp mem_invalid
146
 
147
		mem_valid:
148
		movl 4(%ebx), %ecx						# mbi->mem_lower
149
		addl 8(%ebx), %ecx						# mbi->mem_upper
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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
 
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		xorq %rdx, %rdx
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		movl 24(%ebx), %esi						# mbi->mods_addr
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		movl 0(%esi), %edx						# mods->mod_start
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		movl 4(%esi), %ecx						# mods->mod_end
170
		subl %edx, %ecx
798 decky 171
		addq $0xffffffff80000000, %rdx
695 decky 172
 
173
		mods_invalid:
174
		movl %ecx, init_size
798 decky 175
		movq %rdx, init_addr
695 decky 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
 
696 decky 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
 
694 decky 235
	call main_bsp   # never returns
178 palkovsky 236
 
694 decky 237
	cli
238
	hlt
206 palkovsky 239
 
406 jermar 240
.section K_DATA_START, "aw", @progbits
164 palkovsky 241
.align 4096
206 palkovsky 242
 
417 palkovsky 243
# Identical mapping of first 64MB and the same of -2GB -> 0	
188 palkovsky 244
.global ptl_2
245
ptl_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)
417 palkovsky 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)
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	.quad 0x1e00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
262
	.quad 0x2000000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.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)
188 palkovsky 278
 
279
.align 4096
280
.global ptl_1
281
ptl_1:
282
	.quad ptl_2 + (PTL_WRITABLE | PTL_PRESENT)
283
	.fill 509,8,0
284
	.quad ptl_2 + (PTL_WRITABLE | PTL_PRESENT)
293 palkovsky 285
	.fill 1,8,0
188 palkovsky 286
 
287
.align 4096
288
.global ptl_0
289
ptl_0:
290
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
291
	.fill 510,8,0
292
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
178 palkovsky 293
 
695 decky 294
.global bootstrap_gdtr
295
bootstrap_gdtr:
685 decky 296
	.word gdtselector(GDT_ITEMS)
297
	.long KA2PA(gdt)
695 decky 298
 
299
grub_eax:
300
	.long 0
301
 
302
grub_ebx:
303
	.long 0