2 #include <linux/linkage.h>
3 #include <asm/segment.h>
4 #include <asm/pgtable.h>
8 # Copyright 2003 Pavel Machek <pavel@suse.cz>, distribute under GPLv2
10 # wakeup_code runs in real mode, and at unknown address (determined at run-time).
11 # Therefore it must only use relative jumps/calls.
13 # Do we need to deal with A20? It is okay: ACPI specs says A20 must be enabled
15 # If physical address of wakeup_code is 0x12345, BIOS should call us with
16 # cs = 0x1234, eip = 0x05
42 # Running in *copy* of this code, somewhere in low 1MB.
48 movw %ax, %ds # Make ds:0 point to wakeup_start
51 # Data segment must be set up before we can see whether to beep.
52 testl $4, realmode_flags - wakeup_code
57 # Private stack is needed for ASUS board
58 mov $(wakeup_stack - wakeup_code), %sp
60 pushl $0 # Kill any dangerous flags
63 movl real_magic - wakeup_code, %eax
64 cmpl $0x12345678, %eax
67 testl $1, realmode_flags - wakeup_code
71 movw %ax, %ds # Bios might have played with that
75 testl $2, realmode_flags - wakeup_code
77 mov video_mode - wakeup_code, %ax
81 mov %ds, %ax # Find 32bit wakeup_code addr
82 movzx %ax, %esi # (Convert %ds:gdt to a liner ptr)
85 addl %esi, wakeup_32_vector - wakeup_code
86 addl %esi, wakeup_long64_vector - wakeup_code
87 addl %esi, gdt_48a + 2 - wakeup_code # Fixup the gdt pointer
89 lidtl %ds:idt_48a - wakeup_code
90 lgdtl %ds:gdt_48a - wakeup_code # load gdt with whatever is
93 movl $1, %eax # protected mode (PE) bit
94 lmsw %ax # This is it!
98 ljmpl *(wakeup_32_vector - wakeup_code)
102 .long wakeup_32 - wakeup_code
103 .word __KERNEL32_CS, 0
107 # Running in this code, but at low address; paging is not yet turned on.
109 movl $__KERNEL_DS, %eax
113 * Prepare for entering 64bits mode
121 /* Setup early boot stage 4 level pagetables */
122 leal (wakeup_level4_pgt - wakeup_code)(%esi), %eax
125 /* Check if nx is implemented */
126 movl $0x80000001, %eax
130 /* Enable Long Mode */
132 btsl $_EFER_LME, %eax
134 /* No Execute supported? */
139 /* Make changes effective */
140 1: movl $MSR_EFER, %ecx
145 btsl $31, %eax /* Enable paging and in turn activate Long Mode */
146 btsl $0, %eax /* Enable protected mode */
148 /* Make changes effective */
154 CR3 must point to PML4
155 Next instruction must be a branch
156 This must be on identity-mapped page
159 * At this point we're in long mode but in 32bit compatibility mode
160 * with EFER.LME = 1, CS.L = 0, CS.D = 1 (and in turn
161 * EFER.LMA = 1). Now we want to jump in 64bit mode, to do that we load
162 * the new gdt/idt that has __KERNEL_CS with CS.L = 1.
165 /* Finally jump in 64bit mode */
166 ljmp *(wakeup_long64_vector - wakeup_code)(%esi)
169 wakeup_long64_vector:
170 .long wakeup_long64 - wakeup_code
175 /* Hooray, we are in Long 64-bit mode (but still running in
180 * We must switch to a new descriptor in kernel space for the GDT
181 * because soon the kernel won't have access anymore to the userspace
182 * addresses where we're currently running on. We have to do that here
183 * because in 32bit we couldn't load a 64bit linear address.
187 movq saved_magic, %rax
188 movq $0x123456789abcdef0, %rdx
194 movw $__KERNEL_DS, %ax
214 /* Its good to keep gdt in sync with one in trampoline.S */
215 .word 0, 0, 0, 0 # dummy
216 /* ??? Why I need the accessed bit set in order for this to work? */
217 .quad 0x00cf9b000000ffff # __KERNEL32_CS
218 .quad 0x00af9b000000ffff # __KERNEL_CS
219 .quad 0x00cf93000000ffff # __KERNEL_DS
222 .word 0 # idt limit = 0
223 .word 0, 0 # idt base = 0L
226 .word 0x800 # gdt limit=2048,
228 .long gdta - wakeup_code # gdt base (relocated in later)
232 realmode_flags: .quad 0
242 /* This code uses an extended set of video mode numbers. These include:
243 * Aliases for standard modes
247 * Video modes numbered by menu position -- NOT RECOMMENDED because of lack
248 * of compatibility when extending the table. These are between 0x00 and 0xff.
250 #define VIDEO_FIRST_MENU 0x0000
252 /* Standard BIOS video modes (BIOS number + 0x0100) */
253 #define VIDEO_FIRST_BIOS 0x0100
255 /* VESA BIOS video modes (VESA number + 0x0200) */
256 #define VIDEO_FIRST_VESA 0x0200
258 /* Video7 special modes (BIOS number + 0x0900) */
259 #define VIDEO_FIRST_V7 0x0900
261 # Setting of user mode (AX=mode ID) => CF=success
263 # For now, we only handle VESA modes (0x0200..0x03ff). To handle other
264 # modes, we should probably compile in the video code from the boot
269 subb $VIDEO_FIRST_VESA>>8, %bh
278 orw $0x4000, %bx # Use linear frame buffer
279 movw $0x4f02, %ax # VESA BIOS mode set call
281 cmpw $0x004f, %ax # AL=4f if implemented
282 jnz setbad # AH=0 if OK
287 wakeup_stack_begin: # Stack grows down
290 wakeup_stack: # Just below end of page
293 ENTRY(wakeup_level4_pgt)
294 .quad level3_ident_pgt - __START_KERNEL_map + _KERNPG_TABLE
296 /* (2^48-(2*1024*1024*1024))/(2^39) = 511 */
297 .quad level3_kernel_pgt - __START_KERNEL_map + _KERNPG_TABLE
302 # acpi_copy_wakeup_routine
304 # Copy the above routine to low memory.
307 # %rdi: place to copy wakeup routine to
309 # Returned address is location of code in low memory (past data and stack)
312 ENTRY(acpi_copy_wakeup_routine)
316 movl saved_video_mode, %edx
317 movl %edx, video_mode - wakeup_start (,%rdi)
318 movl acpi_realmode_flags, %edx
319 movl %edx, realmode_flags - wakeup_start (,%rdi)
320 movq $0x12345678, real_magic - wakeup_start (,%rdi)
321 movq $0x123456789abcdef0, %rdx
322 movq %rdx, saved_magic
324 movq saved_magic, %rax
325 movq $0x123456789abcdef0, %rdx
329 # restore the regs we used
332 ENTRY(do_suspend_lowlevel_s4bios)
337 .globl do_suspend_lowlevel
338 .type do_suspend_lowlevel,@function
343 call save_processor_state
345 movq %rsp, saved_context_esp(%rip)
346 movq %rax, saved_context_eax(%rip)
347 movq %rbx, saved_context_ebx(%rip)
348 movq %rcx, saved_context_ecx(%rip)
349 movq %rdx, saved_context_edx(%rip)
350 movq %rbp, saved_context_ebp(%rip)
351 movq %rsi, saved_context_esi(%rip)
352 movq %rdi, saved_context_edi(%rip)
353 movq %r8, saved_context_r08(%rip)
354 movq %r9, saved_context_r09(%rip)
355 movq %r10, saved_context_r10(%rip)
356 movq %r11, saved_context_r11(%rip)
357 movq %r12, saved_context_r12(%rip)
358 movq %r13, saved_context_r13(%rip)
359 movq %r14, saved_context_r14(%rip)
360 movq %r15, saved_context_r15(%rip)
361 pushfq ; popq saved_context_eflags(%rip)
363 movq $.L97, saved_rip(%rip)
374 jmp acpi_enter_sleep_state
381 movq saved_context+58(%rip), %rax
383 movq saved_context+50(%rip), %rax
385 movq saved_context+42(%rip), %rax
387 movq saved_context+34(%rip), %rax
389 pushq saved_context_eflags(%rip) ; popfq
390 movq saved_context_esp(%rip), %rsp
391 movq saved_context_ebp(%rip), %rbp
392 movq saved_context_eax(%rip), %rax
393 movq saved_context_ebx(%rip), %rbx
394 movq saved_context_ecx(%rip), %rcx
395 movq saved_context_edx(%rip), %rdx
396 movq saved_context_esi(%rip), %rsi
397 movq saved_context_edi(%rip), %rdi
398 movq saved_context_r08(%rip), %r8
399 movq saved_context_r09(%rip), %r9
400 movq saved_context_r10(%rip), %r10
401 movq saved_context_r11(%rip), %r11
402 movq saved_context_r12(%rip), %r12
403 movq saved_context_r13(%rip), %r13
404 movq saved_context_r14(%rip), %r14
405 movq saved_context_r15(%rip), %r15
409 jmp restore_processor_state
412 .size do_suspend_lowlevel,.Lfe5-do_suspend_lowlevel
416 ENTRY(saved_rbp) .quad 0
417 ENTRY(saved_rsi) .quad 0
418 ENTRY(saved_rdi) .quad 0
419 ENTRY(saved_rbx) .quad 0
421 ENTRY(saved_rip) .quad 0
422 ENTRY(saved_rsp) .quad 0
424 ENTRY(saved_magic) .quad 0