diff options
Diffstat (limited to 'sys/i386/acpica/acpi_wakecode.S')
| -rw-r--r-- | sys/i386/acpica/acpi_wakecode.S | 322 |
1 files changed, 134 insertions, 188 deletions
diff --git a/sys/i386/acpica/acpi_wakecode.S b/sys/i386/acpica/acpi_wakecode.S index e23b138..27520f3 100644 --- a/sys/i386/acpica/acpi_wakecode.S +++ b/sys/i386/acpica/acpi_wakecode.S @@ -1,6 +1,8 @@ /*- * Copyright (c) 2001 Takanori Watanabe <takawata@jp.freebsd.org> - * Copyright (c) 2001 Mitsuru IWASAKI <iwasaki@jp.freebsd.org> + * Copyright (c) 2001-2012 Mitsuru IWASAKI <iwasaki@jp.freebsd.org> + * Copyright (c) 2003 Peter Wemm + * Copyright (c) 2008-2012 Jung-uk Kim <jkim@FreeBSD.org> * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -28,7 +30,9 @@ */ #include <machine/asmacros.h> +#include <machine/ppireg.h> #include <machine/specialreg.h> +#include <machine/timerreg.h> #include "assym.s" @@ -39,221 +43,163 @@ * Depending on the previous sleep state, we may need to initialize more * of the system (i.e., S3 suspend-to-RAM vs. S4 suspend-to-disk). */ - .align 4 - .code16 -wakeup_16: - nop - cli - cld + .data /* So we can modify it */ + + ALIGN_TEXT + .code16 +wakeup_start: /* * Set up segment registers for real mode, a small stack for * any calls we make, and clear any flags. */ - movw %cs,%ax - movw %ax,%ds - movw %ax,%ss - movw $PAGE_SIZE,%sp - pushl $0 - popfl + cli /* make sure no interrupts */ + mov %cs, %ax /* copy %cs to %ds. Remember these */ + mov %ax, %ds /* are offsets rather than selectors */ + mov %ax, %ss + movw $PAGE_SIZE, %sp + xorw %ax, %ax + pushw %ax + popfw /* To debug resume hangs, beep the speaker if the user requested. */ - cmpl $1,resume_beep - jne nobeep - movb $0xc0,%al - outb %al,$0x42 - movb $0x04,%al - outb %al,$0x42 - inb $0x61,%al - orb $0x3,%al - outb %al,$0x61 -nobeep: + testb $~0, resume_beep - wakeup_start + jz 1f + movb $0, resume_beep - wakeup_start + + /* Set PIC timer2 to beep. */ + movb $(TIMER_SEL2 | TIMER_SQWAVE | TIMER_16BIT), %al + outb %al, $TIMER_MODE + + /* Turn on speaker. */ + inb $IO_PPI, %al + orb $PIT_SPKR, %al + outb %al, $IO_PPI + + /* Set frequency. */ + movw $0x4c0, %ax + outb %al, $TIMER_CNTR2 + shrw $8, %ax + outb %al, $TIMER_CNTR2 +1: /* Re-initialize video BIOS if the reset_video tunable is set. */ - cmpl $1,reset_video - jne nobiosreset - lcall $0xc000,$3 + testb $~0, reset_video - wakeup_start + jz 1f + movb $0, reset_video - wakeup_start + lcall $0xc000, $3 + + /* When we reach here, int 0x10 should be ready. Hide cursor. */ + movb $0x01, %ah + movb $0x20, %ch + int $0x10 + + /* Re-start in case the previous BIOS call clobbers them. */ + jmp wakeup_start +1: /* - * Set up segment registers for real mode again in case the - * previous BIOS call clobbers them. + * Find relocation base and patch the gdt descript and ljmp targets */ - movw %cs,%ax - movw %ax,%ds - movw %ax,%ss -nobiosreset: - - /* Load GDT for real mode. Use 32 bit prefix for addresses >16 MB. */ - lgdtl physical_gdt - - /* Restore CR2, CR3 and CR4 */ - movl previous_cr2,%eax - movl %eax,%cr2 - movl previous_cr3,%eax - movl %eax,%cr3 - movl previous_cr4,%eax - movl %eax,%cr4 + xorl %ebx, %ebx + mov %cs, %bx + sall $4, %ebx /* %ebx is now our relocation base */ - /* Transfer some values to protected mode with an inline stack */ -#define NVALUES 9 -#define TRANSFER_STACK32(val, idx) \ - movl val,%eax; \ - movl %eax,wakeup_32stack+(idx+1)+(idx*4) - - TRANSFER_STACK32(previous_ss, (NVALUES - 9)) - TRANSFER_STACK32(previous_fs, (NVALUES - 8)) - TRANSFER_STACK32(previous_ds, (NVALUES - 7)) - TRANSFER_STACK32(physical_gdt+2, (NVALUES - 6)) - TRANSFER_STACK32(where_to_recover, (NVALUES - 5)) - TRANSFER_STACK32(previous_idt+2, (NVALUES - 4)) - TRANSFER_STACK32(previous_ldt, (NVALUES - 3)) - TRANSFER_STACK32(previous_gdt+2, (NVALUES - 2)) - TRANSFER_STACK32(previous_tr, (NVALUES - 1)) - TRANSFER_STACK32(previous_cr0, (NVALUES - 0)) - - mov physical_esp,%esi /* to be used in 32bit code */ + /* + * Load the descriptor table pointer. We'll need it when running + * in 16-bit protected mode. + */ + lgdtl bootgdtdesc - wakeup_start /* Enable protected mode */ - movl %cr0,%eax - orl $(CR0_PE),%eax - movl %eax,%cr0 + movl $CR0_PE, %eax + mov %eax, %cr0 + /* + * Now execute a far jump to turn on protected mode. This + * causes the segment registers to turn into selectors and causes + * %cs to be loaded from the gdt. + * + * The following instruction is: + * ljmpl $bootcode32 - bootgdt, $wakeup_32 - wakeup_start + * but gas cannot assemble that. And besides, we patch the targets + * in early startup and its a little clearer what we are patching. + */ wakeup_sw32: - /* Switch to protected mode by intersegmental jump */ - ljmpl $KCSEL,$0x12345678 /* Code location, to be replaced */ + .byte 0x66 /* size override to 32 bits */ + .byte 0xea /* opcode for far jump */ + .long wakeup_32 - wakeup_start /* offset in segment */ + .word bootcode32 - bootgdt /* index in gdt for 32 bit code */ /* - * Now switched to protected mode without paging enabled. - * %esi: KERNEL stack pointer (physical address) + * At this point, we are running in 32 bit legacy protected mode. */ + ALIGN_TEXT .code32 wakeup_32: - nop - - /* Set up segment registers for protected mode */ - movw $KDSEL,%ax /* KDSEL to segment registers */ - movw %ax,%ds - movw %ax,%es - movw %ax,%gs - movw %ax,%ss - movw $KPSEL,%ax /* KPSEL to %fs */ - movw %ax,%fs - movl %esi,%esp /* physical address stack pointer */ -wakeup_32stack: - /* Operands are overwritten in 16 bit code by TRANSFER_STACK32 macro */ - pushl $0xabcdef09 /* ss + dummy */ - pushl $0xabcdef08 /* fs + gs */ - pushl $0xabcdef07 /* ds + es */ - pushl $0xabcdef06 /* gdt:base (physical address) */ - pushl $0xabcdef05 /* recover address */ - pushl $0xabcdef04 /* idt:base */ - pushl $0xabcdef03 /* ldt + idt:limit */ - pushl $0xabcdef02 /* gdt:base */ - pushl $0xabcdef01 /* TR + gdt:limit */ - pushl $0xabcdef00 /* CR0 */ + mov $bootdata32 - bootgdt, %eax + mov %ax, %ds - movl %esp,%ebp -#define CR0_REGISTER 0(%ebp) -#define TASK_REGISTER 4(%ebp) -#define PREVIOUS_GDT 6(%ebp) -#define PREVIOUS_LDT 12(%ebp) -#define PREVIOUS_IDT 14(%ebp) -#define RECOVER_ADDR 20(%ebp) -#define PHYSICAL_GDT_BASE 24(%ebp) -#define PREVIOUS_DS 28(%ebp) -#define PREVIOUS_ES 30(%ebp) -#define PREVIOUS_FS 32(%ebp) -#define PREVIOUS_GS 34(%ebp) -#define PREVIOUS_SS 36(%ebp) + /* Get PCB and return address. */ + movl wakeup_pcb - wakeup_start(%ebx), %esi + movl wakeup_ret - wakeup_start(%ebx), %edi - /* Fixup TSS type field */ -#define TSS_TYPEFIX_MASK 0xf9 - xorl %esi,%esi - movl PHYSICAL_GDT_BASE,%ebx - movw TASK_REGISTER,%si - leal (%ebx,%esi),%eax /* get TSS segment descriptor */ - andb $TSS_TYPEFIX_MASK,5(%eax) - - /* Prepare to return to sleep/wakeup code point */ - lgdtl PREVIOUS_GDT - lidtl PREVIOUS_IDT - - /* Pack values from the GDT to be loaded into segment registers. */ - movl PREVIOUS_DS,%ebx - movl PREVIOUS_FS,%ecx - movl PREVIOUS_SS,%edx - movw TASK_REGISTER,%si - shll $16,%esi - movw PREVIOUS_LDT,%si - movl RECOVER_ADDR,%edi - - /* Enable paging and etc. */ - movl CR0_REGISTER,%eax - movl %eax,%cr0 - - /* Flush the prefetch queue */ - jmp 1f -1: jmp 1f -1: + /* Restore CR4 and CR3. */ + movl wakeup_cr4 - wakeup_start(%ebx), %eax + mov %eax, %cr4 + movl wakeup_cr3 - wakeup_start(%ebx), %eax + mov %eax, %cr3 /* - * Now we are in kernel virtual memory addressing with the following - * original register values: - * %ebx: ds + es - * %ecx: fs + gs - * %edx: ss + dummy - * %esi: LDTR + TR - * %edi: recover address - * We'll load these back into the segment registers now. + * Finally, switch to long bit mode by enabling paging. We have + * to be very careful here because all the segmentation disappears + * out from underneath us. The spec says we can depend on the + * subsequent pipelined branch to execute, but *only if* everthing + * is still identity mapped. If any mappings change, the pipeline + * will flush. */ - nop - - movl %esi,%eax /* LDTR + TR */ - lldt %ax /* load LDT register */ - shrl $16,%eax - ltr %ax /* load task register */ + mov %cr0, %eax + orl $CR0_PG, %eax + mov %eax, %cr0 - /* Restore segment registers */ - movl %ebx,%eax /* ds + es */ - movw %ax,%ds - shrl $16,%eax - movw %ax,%es - movl %ecx,%eax /* fs + gs */ - movw %ax,%fs - shrl $16,%eax - movw %ax,%gs - movl %edx,%eax /* ss */ - movw %ax,%ss - - /* Jump to acpi_restorecpu() */ + jmp 1f +1: + /* Jump to return address. */ jmp *%edi -/* used in real mode */ -physical_gdt: .word 0 - .long 0 -physical_esp: .long 0 -previous_cr2: .long 0 -previous_cr3: .long 0 -previous_cr4: .long 0 -resume_beep: .long 0 -reset_video: .long 0 - -/* - * Transfer from real mode to protected mode. The order of these variables - * is very important, DO NOT INSERT OR CHANGE unless you know why. - */ -previous_cr0: .long 0 -previous_tr: .word 0 -previous_gdt: .word 0 - .long 0 -previous_ldt: .word 0 -previous_idt: .word 0 - .long 0 -where_to_recover: .long 0 -previous_ds: .word 0 -previous_es: .word 0 -previous_fs: .word 0 -previous_gs: .word 0 -previous_ss: .word 0 -dummy: .word 0 + .data + +resume_beep: + .byte 0 +reset_video: + .byte 0 + + ALIGN_DATA +bootgdt: + .long 0x00000000 + .long 0x00000000 + +bootcode32: + .long 0x0000ffff + .long 0x00cf9b00 + +bootdata32: + .long 0x0000ffff + .long 0x00cf9300 +bootgdtend: + +bootgdtdesc: + .word bootgdtend - bootgdt /* Length */ + .long bootgdt - wakeup_start /* Offset plus %ds << 4 */ + + ALIGN_DATA +wakeup_cr4: + .long 0 +wakeup_cr3: + .long 0 +wakeup_pcb: + .long 0 +wakeup_ret: + .long 0 +dummy: |
