Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
5b171e82 | 2 | * linux/arch/x86/kernel/head_64.S -- start in 32bit and switch to 64bit |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE | |
5 | * Copyright (C) 2000 Pavel Machek <pavel@suse.cz> | |
6 | * Copyright (C) 2000 Karsten Keil <kkeil@suse.de> | |
7 | * Copyright (C) 2001,2002 Andi Kleen <ak@suse.de> | |
1ab60e0f | 8 | * Copyright (C) 2005 Eric Biederman <ebiederm@xmission.com> |
1da177e4 LT |
9 | */ |
10 | ||
11 | ||
12 | #include <linux/linkage.h> | |
13 | #include <linux/threads.h> | |
f6c2e333 | 14 | #include <linux/init.h> |
1da177e4 | 15 | #include <asm/segment.h> |
67dcbb6b | 16 | #include <asm/pgtable.h> |
1da177e4 LT |
17 | #include <asm/page.h> |
18 | #include <asm/msr.h> | |
19 | #include <asm/cache.h> | |
369101da | 20 | #include <asm/processor-flags.h> |
b12d8db8 | 21 | #include <asm/percpu.h> |
9900aa2f | 22 | #include <asm/nops.h> |
7bbcdb1c | 23 | #include "../entry/calling.h" |
784d5699 | 24 | #include <asm/export.h> |
1ab60e0f | 25 | |
49a69787 GOC |
26 | #ifdef CONFIG_PARAVIRT |
27 | #include <asm/asm-offsets.h> | |
28 | #include <asm/paravirt.h> | |
ffc4bc9c | 29 | #define GET_CR2_INTO(reg) GET_CR2_INTO_RAX ; movq %rax, reg |
49a69787 | 30 | #else |
ffc4bc9c | 31 | #define GET_CR2_INTO(reg) movq %cr2, reg |
9900aa2f | 32 | #define INTERRUPT_RETURN iretq |
49a69787 GOC |
33 | #endif |
34 | ||
3ad2f3fb | 35 | /* we are not able to switch in one step to the final KERNEL ADDRESS SPACE |
1ab60e0f VG |
36 | * because we need identity-mapped pages. |
37 | * | |
1da177e4 LT |
38 | */ |
39 | ||
a6523748 EH |
40 | #define pud_index(x) (((x) >> PUD_SHIFT) & (PTRS_PER_PUD-1)) |
41 | ||
021182e5 | 42 | L4_PAGE_OFFSET = pgd_index(__PAGE_OFFSET_BASE) |
a6523748 EH |
43 | L4_START_KERNEL = pgd_index(__START_KERNEL_map) |
44 | L3_START_KERNEL = pud_index(__START_KERNEL_map) | |
45 | ||
1da177e4 | 46 | .text |
4ae59b91 | 47 | __HEAD |
1ab60e0f VG |
48 | .code64 |
49 | .globl startup_64 | |
50 | startup_64: | |
1da177e4 | 51 | /* |
1256276c | 52 | * At this point the CPU runs in 64bit mode CS.L = 1 CS.D = 0, |
1ab60e0f VG |
53 | * and someone has loaded an identity mapped page table |
54 | * for us. These identity mapped page tables map all of the | |
55 | * kernel pages and possibly all of memory. | |
56 | * | |
8170e6be | 57 | * %rsi holds a physical pointer to real_mode_data. |
1ab60e0f VG |
58 | * |
59 | * We come here either directly from a 64bit bootloader, or from | |
5b171e82 | 60 | * arch/x86/boot/compressed/head_64.S. |
1ab60e0f VG |
61 | * |
62 | * We only come here initially at boot nothing else comes here. | |
63 | * | |
64 | * Since we may be loaded at an address different from what we were | |
65 | * compiled to run at we first fixup the physical addresses in our page | |
66 | * tables and then reload them. | |
1da177e4 LT |
67 | */ |
68 | ||
91ed140d BP |
69 | /* |
70 | * Setup stack for verify_cpu(). "-8" because stack_start is defined | |
71 | * this way, see below. Our best guess is a NULL ptr for stack | |
72 | * termination heuristics and we don't want to break anything which | |
73 | * might depend on it (kgdb, ...). | |
74 | */ | |
75 | leaq (__end_init_task - 8)(%rip), %rsp | |
76 | ||
04633df0 BP |
77 | /* Sanitize CPU configuration */ |
78 | call verify_cpu | |
79 | ||
8170e6be PA |
80 | /* |
81 | * Compute the delta between the address I am compiled to run at and the | |
1ab60e0f | 82 | * address I am actually running at. |
1da177e4 | 83 | */ |
1ab60e0f VG |
84 | leaq _text(%rip), %rbp |
85 | subq $_text - __START_KERNEL_map, %rbp | |
86 | ||
87 | /* Is the address not 2M aligned? */ | |
a4733143 | 88 | testl $~PMD_PAGE_MASK, %ebp |
1ab60e0f VG |
89 | jnz bad_address |
90 | ||
8170e6be PA |
91 | /* |
92 | * Is the address too large? | |
1da177e4 | 93 | */ |
8170e6be PA |
94 | leaq _text(%rip), %rax |
95 | shrq $MAX_PHYSMEM_BITS, %rax | |
96 | jnz bad_address | |
1ab60e0f | 97 | |
8170e6be PA |
98 | /* |
99 | * Fixup the physical addresses in the page table | |
100 | */ | |
101 | addq %rbp, early_level4_pgt + (L4_START_KERNEL*8)(%rip) | |
b1c931e3 | 102 | |
1ab60e0f | 103 | addq %rbp, level3_kernel_pgt + (510*8)(%rip) |
b1c931e3 EB |
104 | addq %rbp, level3_kernel_pgt + (511*8)(%rip) |
105 | ||
106 | addq %rbp, level2_fixmap_pgt + (506*8)(%rip) | |
1ab60e0f | 107 | |
8170e6be PA |
108 | /* |
109 | * Set up the identity mapping for the switchover. These | |
110 | * entries should *NOT* have the global bit set! This also | |
111 | * creates a bunch of nonsense entries but that is fine -- | |
112 | * it avoids problems around wraparound. | |
113 | */ | |
1ab60e0f | 114 | leaq _text(%rip), %rdi |
8170e6be | 115 | leaq early_level4_pgt(%rip), %rbx |
1ab60e0f VG |
116 | |
117 | movq %rdi, %rax | |
8170e6be | 118 | shrq $PGDIR_SHIFT, %rax |
1ab60e0f | 119 | |
8170e6be PA |
120 | leaq (4096 + _KERNPG_TABLE)(%rbx), %rdx |
121 | movq %rdx, 0(%rbx,%rax,8) | |
122 | movq %rdx, 8(%rbx,%rax,8) | |
1ab60e0f | 123 | |
8170e6be | 124 | addq $4096, %rdx |
1ab60e0f | 125 | movq %rdi, %rax |
8170e6be PA |
126 | shrq $PUD_SHIFT, %rax |
127 | andl $(PTRS_PER_PUD-1), %eax | |
e9d0626e ZY |
128 | movq %rdx, 4096(%rbx,%rax,8) |
129 | incl %eax | |
130 | andl $(PTRS_PER_PUD-1), %eax | |
131 | movq %rdx, 4096(%rbx,%rax,8) | |
8170e6be PA |
132 | |
133 | addq $8192, %rbx | |
134 | movq %rdi, %rax | |
135 | shrq $PMD_SHIFT, %rdi | |
136 | addq $(__PAGE_KERNEL_LARGE_EXEC & ~_PAGE_GLOBAL), %rax | |
137 | leaq (_end - 1)(%rip), %rcx | |
138 | shrq $PMD_SHIFT, %rcx | |
139 | subq %rdi, %rcx | |
140 | incl %ecx | |
141 | ||
142 | 1: | |
143 | andq $(PTRS_PER_PMD - 1), %rdi | |
144 | movq %rax, (%rbx,%rdi,8) | |
145 | incq %rdi | |
146 | addq $PMD_SIZE, %rax | |
147 | decl %ecx | |
148 | jnz 1b | |
1ab60e0f | 149 | |
31eedd82 TG |
150 | /* |
151 | * Fixup the kernel text+data virtual addresses. Note that | |
152 | * we might write invalid pmds, when the kernel is relocated | |
153 | * cleanup_highmap() fixes this up along with the mappings | |
154 | * beyond _end. | |
1ab60e0f VG |
155 | */ |
156 | leaq level2_kernel_pgt(%rip), %rdi | |
157 | leaq 4096(%rdi), %r8 | |
158 | /* See if it is a valid page table entry */ | |
3e1aa7cb | 159 | 1: testb $1, 0(%rdi) |
1ab60e0f VG |
160 | jz 2f |
161 | addq %rbp, 0(%rdi) | |
162 | /* Go to the next page */ | |
163 | 2: addq $8, %rdi | |
164 | cmp %r8, %rdi | |
165 | jne 1b | |
166 | ||
167 | /* Fixup phys_base */ | |
168 | addq %rbp, phys_base(%rip) | |
1da177e4 | 169 | |
8170e6be PA |
170 | movq $(early_level4_pgt - __START_KERNEL_map), %rax |
171 | jmp 1f | |
90b1c208 | 172 | ENTRY(secondary_startup_64) |
1ab60e0f | 173 | /* |
1256276c | 174 | * At this point the CPU runs in 64bit mode CS.L = 1 CS.D = 0, |
1ab60e0f VG |
175 | * and someone has loaded a mapped page table. |
176 | * | |
8170e6be | 177 | * %rsi holds a physical pointer to real_mode_data. |
1ab60e0f VG |
178 | * |
179 | * We come here either from startup_64 (using physical addresses) | |
180 | * or from trampoline.S (using virtual addresses). | |
181 | * | |
182 | * Using virtual addresses from trampoline.S removes the need | |
183 | * to have any identity mapped pages in the kernel page table | |
184 | * after the boot processor executes this code. | |
1da177e4 LT |
185 | */ |
186 | ||
04633df0 BP |
187 | /* Sanitize CPU configuration */ |
188 | call verify_cpu | |
189 | ||
8170e6be PA |
190 | movq $(init_level4_pgt - __START_KERNEL_map), %rax |
191 | 1: | |
192 | ||
1da177e4 | 193 | /* Enable PAE mode and PGE */ |
8170e6be PA |
194 | movl $(X86_CR4_PAE | X86_CR4_PGE), %ecx |
195 | movq %rcx, %cr4 | |
1da177e4 LT |
196 | |
197 | /* Setup early boot stage 4 level pagetables. */ | |
1ab60e0f | 198 | addq phys_base(%rip), %rax |
1da177e4 LT |
199 | movq %rax, %cr3 |
200 | ||
1ab60e0f VG |
201 | /* Ensure I am executing from virtual addresses */ |
202 | movq $1f, %rax | |
203 | jmp *%rax | |
204 | 1: | |
205 | ||
1da177e4 LT |
206 | /* Check if nx is implemented */ |
207 | movl $0x80000001, %eax | |
208 | cpuid | |
209 | movl %edx,%edi | |
210 | ||
211 | /* Setup EFER (Extended Feature Enable Register) */ | |
212 | movl $MSR_EFER, %ecx | |
213 | rdmsr | |
1ab60e0f VG |
214 | btsl $_EFER_SCE, %eax /* Enable System Call */ |
215 | btl $20,%edi /* No Execute supported? */ | |
1da177e4 LT |
216 | jnc 1f |
217 | btsl $_EFER_NX, %eax | |
78d77df7 | 218 | btsq $_PAGE_BIT_NX,early_pmd_flags(%rip) |
1ab60e0f | 219 | 1: wrmsr /* Make changes effective */ |
1da177e4 LT |
220 | |
221 | /* Setup cr0 */ | |
369101da CG |
222 | #define CR0_STATE (X86_CR0_PE | X86_CR0_MP | X86_CR0_ET | \ |
223 | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM | \ | |
224 | X86_CR0_PG) | |
225 | movl $CR0_STATE, %eax | |
1da177e4 LT |
226 | /* Make changes effective */ |
227 | movq %rax, %cr0 | |
228 | ||
229 | /* Setup a boot time stack */ | |
8170e6be | 230 | movq stack_start(%rip), %rsp |
1da177e4 LT |
231 | |
232 | /* zero EFLAGS after setting rsp */ | |
233 | pushq $0 | |
234 | popfq | |
235 | ||
236 | /* | |
237 | * We must switch to a new descriptor in kernel space for the GDT | |
238 | * because soon the kernel won't have access anymore to the userspace | |
239 | * addresses where we're currently running on. We have to do that here | |
240 | * because in 32bit we couldn't load a 64bit linear address. | |
241 | */ | |
a939098a | 242 | lgdt early_gdt_descr(%rip) |
1da177e4 | 243 | |
8ec6993d BG |
244 | /* set up data segments */ |
245 | xorl %eax,%eax | |
ffb60175 ZA |
246 | movl %eax,%ds |
247 | movl %eax,%ss | |
248 | movl %eax,%es | |
249 | ||
250 | /* | |
251 | * We don't really need to load %fs or %gs, but load them anyway | |
252 | * to kill any stale realmode selectors. This allows execution | |
253 | * under VT hardware. | |
254 | */ | |
255 | movl %eax,%fs | |
256 | movl %eax,%gs | |
257 | ||
f32ff538 TH |
258 | /* Set up %gs. |
259 | * | |
947e76cd BG |
260 | * The base of %gs always points to the bottom of the irqstack |
261 | * union. If the stack protector canary is enabled, it is | |
262 | * located at %gs:40. Note that, on SMP, the boot cpu uses | |
263 | * init data section till per cpu areas are set up. | |
f32ff538 | 264 | */ |
1da177e4 | 265 | movl $MSR_GS_BASE,%ecx |
650fb439 BG |
266 | movl initial_gs(%rip),%eax |
267 | movl initial_gs+4(%rip),%edx | |
1da177e4 LT |
268 | wrmsr |
269 | ||
8170e6be | 270 | /* rsi is pointer to real mode structure with interesting info. |
1da177e4 | 271 | pass it to C */ |
8170e6be | 272 | movq %rsi, %rdi |
1da177e4 LT |
273 | |
274 | /* Finally jump to run C code and to be on real kernel address | |
275 | * Since we are running on identity-mapped space we have to jump | |
26374c7b EB |
276 | * to the full 64bit address, this is only possible as indirect |
277 | * jump. In addition we need to ensure %cs is set so we make this | |
278 | * a far return. | |
8170e6be PA |
279 | * |
280 | * Note: do not change to far jump indirect with 64bit offset. | |
281 | * | |
282 | * AMD does not support far jump indirect with 64bit offset. | |
283 | * AMD64 Architecture Programmer's Manual, Volume 3: states only | |
284 | * JMP FAR mem16:16 FF /5 Far jump indirect, | |
285 | * with the target specified by a far pointer in memory. | |
286 | * JMP FAR mem16:32 FF /5 Far jump indirect, | |
287 | * with the target specified by a far pointer in memory. | |
288 | * | |
289 | * Intel64 does support 64bit offset. | |
290 | * Software Developer Manual Vol 2: states: | |
291 | * FF /5 JMP m16:16 Jump far, absolute indirect, | |
292 | * address given in m16:16 | |
293 | * FF /5 JMP m16:32 Jump far, absolute indirect, | |
294 | * address given in m16:32. | |
295 | * REX.W + FF /5 JMP m16:64 Jump far, absolute indirect, | |
296 | * address given in m16:64. | |
1da177e4 LT |
297 | */ |
298 | movq initial_code(%rip),%rax | |
26374c7b EB |
299 | pushq $0 # fake return address to stop unwinder |
300 | pushq $__KERNEL_CS # set correct cs | |
301 | pushq %rax # target address in negative space | |
302 | lretq | |
dbf984d8 | 303 | ENDPROC(secondary_startup_64) |
1da177e4 | 304 | |
04633df0 BP |
305 | #include "verify_cpu.S" |
306 | ||
42e78e97 FY |
307 | #ifdef CONFIG_HOTPLUG_CPU |
308 | /* | |
309 | * Boot CPU0 entry point. It's called from play_dead(). Everything has been set | |
310 | * up already except stack. We just set up stack here. Then call | |
311 | * start_secondary(). | |
312 | */ | |
313 | ENTRY(start_cpu0) | |
314 | movq stack_start(%rip),%rsp | |
315 | movq initial_code(%rip),%rax | |
316 | pushq $0 # fake return address to stop unwinder | |
317 | pushq $__KERNEL_CS # set correct cs | |
318 | pushq %rax # target address in negative space | |
319 | lretq | |
320 | ENDPROC(start_cpu0) | |
321 | #endif | |
322 | ||
e57113bc | 323 | /* SMP bootup changes these two */ |
da5968ae | 324 | __REFDATA |
8170e6be PA |
325 | .balign 8 |
326 | GLOBAL(initial_code) | |
1da177e4 | 327 | .quad x86_64_start_kernel |
8170e6be | 328 | GLOBAL(initial_gs) |
2add8e23 | 329 | .quad INIT_PER_CPU_VAR(irq_stack_union) |
f1fbabb3 | 330 | |
8170e6be | 331 | GLOBAL(stack_start) |
1da177e4 | 332 | .quad init_thread_union+THREAD_SIZE-8 |
9cf4f298 | 333 | .word 0 |
b9af7c0d | 334 | __FINITDATA |
1da177e4 | 335 | |
1ab60e0f VG |
336 | bad_address: |
337 | jmp bad_address | |
338 | ||
8170e6be | 339 | __INIT |
cdeb6048 | 340 | ENTRY(early_idt_handler_array) |
9900aa2f PA |
341 | # 104(%rsp) %rflags |
342 | # 96(%rsp) %cs | |
343 | # 88(%rsp) %rip | |
344 | # 80(%rsp) error code | |
749c970a AK |
345 | i = 0 |
346 | .rept NUM_EXCEPTION_VECTORS | |
cdeb6048 | 347 | .ifeq (EXCEPTION_ERRCODE_MASK >> i) & 1 |
9900aa2f PA |
348 | pushq $0 # Dummy error code, to make stack frame uniform |
349 | .endif | |
350 | pushq $i # 72(%rsp) Vector number | |
cdeb6048 | 351 | jmp early_idt_handler_common |
749c970a | 352 | i = i + 1 |
cdeb6048 | 353 | .fill early_idt_handler_array + i*EARLY_IDT_HANDLER_SIZE - ., 1, 0xcc |
749c970a | 354 | .endr |
cdeb6048 | 355 | ENDPROC(early_idt_handler_array) |
8866cd9d | 356 | |
cdeb6048 AL |
357 | early_idt_handler_common: |
358 | /* | |
359 | * The stack is the hardware frame, an error code or zero, and the | |
360 | * vector number. | |
361 | */ | |
9900aa2f PA |
362 | cld |
363 | ||
b957591f | 364 | incl early_recursion_flag(%rip) |
9900aa2f | 365 | |
7bbcdb1c AL |
366 | /* The vector number is currently in the pt_regs->di slot. */ |
367 | pushq %rsi /* pt_regs->si */ | |
368 | movq 8(%rsp), %rsi /* RSI = vector number */ | |
369 | movq %rdi, 8(%rsp) /* pt_regs->di = RDI */ | |
370 | pushq %rdx /* pt_regs->dx */ | |
371 | pushq %rcx /* pt_regs->cx */ | |
372 | pushq %rax /* pt_regs->ax */ | |
373 | pushq %r8 /* pt_regs->r8 */ | |
374 | pushq %r9 /* pt_regs->r9 */ | |
375 | pushq %r10 /* pt_regs->r10 */ | |
376 | pushq %r11 /* pt_regs->r11 */ | |
377 | pushq %rbx /* pt_regs->bx */ | |
378 | pushq %rbp /* pt_regs->bp */ | |
379 | pushq %r12 /* pt_regs->r12 */ | |
380 | pushq %r13 /* pt_regs->r13 */ | |
381 | pushq %r14 /* pt_regs->r14 */ | |
382 | pushq %r15 /* pt_regs->r15 */ | |
383 | ||
7bbcdb1c | 384 | cmpq $14,%rsi /* Page fault? */ |
8170e6be | 385 | jnz 10f |
7bbcdb1c | 386 | GET_CR2_INTO(%rdi) /* Can clobber any volatile register if pv */ |
8170e6be PA |
387 | call early_make_pgtable |
388 | andl %eax,%eax | |
7bbcdb1c | 389 | jz 20f /* All good */ |
9900aa2f | 390 | |
8170e6be | 391 | 10: |
7bbcdb1c | 392 | movq %rsp,%rdi /* RDI = pt_regs; RSI is already trapnr */ |
9900aa2f | 393 | call early_fixup_exception |
076f9776 | 394 | |
0e861fbb | 395 | 20: |
9900aa2f | 396 | decl early_recursion_flag(%rip) |
7bbcdb1c | 397 | jmp restore_regs_and_iret |
cdeb6048 | 398 | ENDPROC(early_idt_handler_common) |
9900aa2f | 399 | |
8170e6be PA |
400 | __INITDATA |
401 | ||
9900aa2f | 402 | .balign 4 |
0e861fbb | 403 | GLOBAL(early_recursion_flag) |
b957591f | 404 | .long 0 |
1da177e4 | 405 | |
f0cf5d1a | 406 | #define NEXT_PAGE(name) \ |
67dcbb6b | 407 | .balign PAGE_SIZE; \ |
8170e6be | 408 | GLOBAL(name) |
f0cf5d1a | 409 | |
67dcbb6b | 410 | /* Automate the creation of 1 to 1 mapping pmd entries */ |
0e192b99 CG |
411 | #define PMDS(START, PERM, COUNT) \ |
412 | i = 0 ; \ | |
413 | .rept (COUNT) ; \ | |
414 | .quad (START) + (i << PMD_SHIFT) + (PERM) ; \ | |
415 | i = i + 1 ; \ | |
67dcbb6b VG |
416 | .endr |
417 | ||
8170e6be PA |
418 | __INITDATA |
419 | NEXT_PAGE(early_level4_pgt) | |
420 | .fill 511,8,0 | |
421 | .quad level3_kernel_pgt - __START_KERNEL_map + _PAGE_TABLE | |
422 | ||
423 | NEXT_PAGE(early_dynamic_pgts) | |
424 | .fill 512*EARLY_DYNAMIC_PAGE_TABLES,8,0 | |
425 | ||
b9af7c0d | 426 | .data |
8170e6be PA |
427 | |
428 | #ifndef CONFIG_XEN | |
f0cf5d1a | 429 | NEXT_PAGE(init_level4_pgt) |
8170e6be PA |
430 | .fill 512,8,0 |
431 | #else | |
432 | NEXT_PAGE(init_level4_pgt) | |
433 | .quad level3_ident_pgt - __START_KERNEL_map + _KERNPG_TABLE | |
434 | .org init_level4_pgt + L4_PAGE_OFFSET*8, 0 | |
435 | .quad level3_ident_pgt - __START_KERNEL_map + _KERNPG_TABLE | |
436 | .org init_level4_pgt + L4_START_KERNEL*8, 0 | |
cfd243d4 | 437 | /* (2^48-(2*1024*1024*1024))/(2^39) = 511 */ |
8170e6be | 438 | .quad level3_kernel_pgt - __START_KERNEL_map + _PAGE_TABLE |
1da177e4 | 439 | |
f0cf5d1a | 440 | NEXT_PAGE(level3_ident_pgt) |
67dcbb6b | 441 | .quad level2_ident_pgt - __START_KERNEL_map + _KERNPG_TABLE |
8170e6be PA |
442 | .fill 511, 8, 0 |
443 | NEXT_PAGE(level2_ident_pgt) | |
444 | /* Since I easily can, map the first 1G. | |
445 | * Don't set NX because code runs from these pages. | |
446 | */ | |
447 | PMDS(0, __PAGE_KERNEL_IDENT_LARGE_EXEC, PTRS_PER_PMD) | |
448 | #endif | |
1da177e4 | 449 | |
f0cf5d1a | 450 | NEXT_PAGE(level3_kernel_pgt) |
a6523748 | 451 | .fill L3_START_KERNEL,8,0 |
1da177e4 | 452 | /* (2^48-(2*1024*1024*1024)-((2^39)*511))/(2^30) = 510 */ |
67dcbb6b | 453 | .quad level2_kernel_pgt - __START_KERNEL_map + _KERNPG_TABLE |
b1c931e3 EB |
454 | .quad level2_fixmap_pgt - __START_KERNEL_map + _PAGE_TABLE |
455 | ||
f0cf5d1a | 456 | NEXT_PAGE(level2_kernel_pgt) |
88f3aec7 | 457 | /* |
85eb69a1 | 458 | * 512 MB kernel mapping. We spend a full page on this pagetable |
88f3aec7 IM |
459 | * anyway. |
460 | * | |
461 | * The kernel code+data+bss must not be bigger than that. | |
462 | * | |
85eb69a1 | 463 | * (NOTE: at +512MB starts the module area, see MODULES_VADDR. |
88f3aec7 IM |
464 | * If you want to increase this then increase MODULES_VADDR |
465 | * too.) | |
466 | */ | |
8490638c | 467 | PMDS(0, __PAGE_KERNEL_LARGE_EXEC, |
d4afe414 | 468 | KERNEL_IMAGE_SIZE/PMD_SIZE) |
1da177e4 | 469 | |
8170e6be PA |
470 | NEXT_PAGE(level2_fixmap_pgt) |
471 | .fill 506,8,0 | |
472 | .quad level1_fixmap_pgt - __START_KERNEL_map + _PAGE_TABLE | |
473 | /* 8MB reserved for vsyscalls + a 2MB hole = 4 + 1 entries */ | |
474 | .fill 5,8,0 | |
475 | ||
476 | NEXT_PAGE(level1_fixmap_pgt) | |
477 | .fill 512,8,0 | |
1ab60e0f | 478 | |
67dcbb6b | 479 | #undef PMDS |
1da177e4 | 480 | |
f0cf5d1a | 481 | .data |
1da177e4 | 482 | .align 16 |
a939098a GC |
483 | .globl early_gdt_descr |
484 | early_gdt_descr: | |
485 | .word GDT_ENTRIES*8-1 | |
3e5d8f97 | 486 | early_gdt_descr_base: |
2add8e23 | 487 | .quad INIT_PER_CPU_VAR(gdt_page) |
1da177e4 | 488 | |
1ab60e0f VG |
489 | ENTRY(phys_base) |
490 | /* This must match the first entry in level2_kernel_pgt */ | |
491 | .quad 0x0000000000000000 | |
784d5699 | 492 | EXPORT_SYMBOL(phys_base) |
1ab60e0f | 493 | |
8c5e5ac3 | 494 | #include "../../x86/xen/xen-head.S" |
1da177e4 | 495 | |
02b7da37 | 496 | __PAGE_ALIGNED_BSS |
8170e6be | 497 | NEXT_PAGE(empty_zero_page) |
e57113bc | 498 | .skip PAGE_SIZE |
784d5699 | 499 | EXPORT_SYMBOL(empty_zero_page) |
ef7f0d6a | 500 |