/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #pragma ident "%Z%%M% %I% %E% SMI" #include #include #include #include #include #include #if !defined(__lint) #include #include "assym.h" #endif #ifdef DEBUG #define LED 1 #define SERIAL 1 #endif /* DEBUG */ #ifdef DEBUG #define COM1 0x3f8 #define COM2 0x2f8 #define WC_COM COM2 /* either COM1 or COM2 */ #define WC_LED 0x80 /* diagnostic led port ON motherboard */ /* * defined as offsets from the data register */ #define DLL 0 /* divisor latch (lsb) */ #define DLH 1 /* divisor latch (msb) */ #define LCR 3 /* line control register */ #define MCR 4 /* modem control register */ #define DLAB 0x80 /* divisor latch access bit */ #define B9600L 0X0c /* lsb bit pattern for 9600 baud */ #define B9600H 0X0 /* hsb bit pattern for 9600 baud */ #define DTR 0x01 /* Data Terminal Ready */ #define RTS 0x02 /* Request To Send */ #define STOP1 0x00 /* 1 stop bit */ #define BITS8 0x03 /* 8 bits per char */ #endif /* DEBUG */ /* * This file contains the low level routines involved in getting * into and out of ACPI S3, including those needed for restarting * the non-boot cpus. * * Our assumptions: * * Our actions: * */ #if defined(lint) || defined(__lint) /*ARGSUSED*/ int wc_save_context(wc_cpu_t *pcpu) { return 0; } #else /* lint */ #if defined(__GNU_AS__) NOTHING AT ALL YET! #else /* !defined(__GNU_AS__) */ #if defined(__amd64) ENTRY_NP(wc_save_context) movq (%rsp), %rdx / return address movq %rdx, WC_RETADDR(%rdi) /* * C calling convention with no local variables, just use 1st arg ie %rdi * and the registers. Therefore push caller's fp, set out fp to be sp and * push %r12, %r13 %r14. At function end unwind this by: popping %r14, %r13 * %r14, restore the sp from fp and pop caller's fp. */ pushq %rbp movq %rsp,%rbp pushq %r12 pushq %r13 pushq %r14 movq %rdi, WC_VIRTADDR(%rdi) movq %rdi, WC_RDI(%rdi) movq %rdx, WC_RDX(%rdi) / stash everything else we need sgdt WC_GDT(%rdi) sidt WC_IDT(%rdi) sldt WC_LDT(%rdi) str WC_TR(%rdi) movq %cr0, %rdx movq %rdx, WC_CR0(%rdi) movq %cr3, %rdx movq %rdx, WC_CR3(%rdi) movq %cr4, %rdx movq %rdx, WC_CR4(%rdi) movq %cr8, %rdx movq %rdx, WC_CR8(%rdi) movq %r8, WC_R8(%rdi) movq %r9, WC_R9(%rdi) movq %r10, WC_R10(%rdi) movq %r11, WC_R11(%rdi) movq %r12, WC_R12(%rdi) movq %r13, WC_R13(%rdi) movq %r14, WC_R14(%rdi) movq %r15, WC_R15(%rdi) movq %rax, WC_RAX(%rdi) movq %rbp, WC_RBP(%rdi) movq %rbx, WC_RBX(%rdi) movq %rcx, WC_RCX(%rdi) movq %rsi, WC_RSI(%rdi) movq %rsp, WC_RSP(%rdi) movw %ss, WC_SS(%rdi) movw %cs, WC_CS(%rdi) movw %ds, WC_DS(%rdi) movw %es, WC_ES(%rdi) movq $0, %rcx / save %fs register movw %fs, %cx movq %rcx, WC_FS(%rdi) movl $MSR_AMD_FSBASE, %ecx rdmsr movl %eax, WC_FSBASE(%rdi) movl %edx, WC_FSBASE+4(%rdi) movq $0, %rcx / save %gs register movw %gs, %cx movq %rcx, WC_GS(%rdi) movl $MSR_AMD_GSBASE, %ecx / save gsbase msr rdmsr movl %eax, WC_GSBASE(%rdi) movl %edx, WC_GSBASE+4(%rdi) movl $MSR_AMD_KGSBASE, %ecx / save kgsbase msr rdmsr movl %eax, WC_KGSBASE(%rdi) movl %edx, WC_KGSBASE+4(%rdi) pushfq popq WC_EFLAGS(%rdi) /* * call save_stack(cpup) * NB %rdi is the first arguemnt to both wc_save_context() and save_stack() * so it must not be modified during either of these calls. * The pushq will decrement the value of %rsp * we need to push the %rbp because it is the frame pointer and we need * to use the C calling convention */ pushq %rbp call *save_stack_func popq %rbp wbinvd / flush the cache movq $1, %rax / at suspend return 1 / see comment at function enter popq %r14 popq %r13 popq %r12 leave ret SET_SIZE(wc_save_context) #elif defined(__i386) ENTRY_NP(wc_save_context) movl 4(%esp), %eax / wc_cpu_t * movl %eax, WC_VIRTADDR(%eax) movl (%esp), %edx / return address movl %edx, WC_RETADDR(%eax) str WC_TR(%eax) / stash everything else we need sgdt WC_GDT(%eax) sldt WC_LDT(%eax) sidt WC_IDT(%eax) movl %cr0, %edx movl %edx, WC_CR0(%eax) movl %cr3, %edx movl %edx, WC_CR3(%eax) movl %cr4, %edx movl %edx, WC_CR4(%eax) movl %ebx, WC_EBX(%eax) movl %edi, WC_EDI(%eax) movl %esi, WC_ESI(%eax) movl %ebp, WC_EBP(%eax) movl %esp, WC_ESP(%eax) movw %ss, WC_SS(%eax) movw %cs, WC_CS(%eax) movw %ds, WC_DS(%eax) movw %es, WC_ES(%eax) movw %fs, WC_FS(%eax) movw %gs, WC_GS(%eax) pushfl popl WC_EFLAGS(%eax) wbinvd / flush the cache movl $1, %eax / at suspend return 1 ret SET_SIZE(wc_save_context) #endif /* __amd64 */ #endif /* __GNU_AS__ */ #endif /* lint */ /* * Our assumptions: * - We are running in real mode. * - Interrupts are disabled. * * Our actions: * - We start using our GDT by loading correct values in the * selector registers (cs=KCS_SEL, ds=es=ss=KDS_SEL, fs=KFS_SEL, * gs=KGS_SEL). * - We change over to using our IDT. * - We load the default LDT into the hardware LDT register. * - We load the default TSS into the hardware task register. * - We restore registers * - We return to original caller (a la setjmp) */ #if defined(lint) || defined(__lint) void wc_rm_start(void) {} void wc_rm_end(void) {} #else /* lint */ #if defined(__GNU_AS__) NOTHING AT ALL YET! #else /* __GNU_AS__ */ #if defined(__amd64) ENTRY_NP(wc_rm_start) /* * For vulcan as we need to do a .code32 and mentally invert the * meaning of the addr16 and data16 prefixes to get 32-bit access when * generating code to be executed in 16-bit mode (sigh...) */ .code32 cli movw %cs, %ax movw %ax, %ds / establish ds ... movw %ax, %ss / ... and ss:esp D16 movl $WC_STKSTART, %esp / using the following value blows up machines! - DO NOT USE / D16 movl 0xffc, %esp #if LED D16 movl $WC_LED, %edx D16 movb $0xd1, %al outb (%dx) #endif #if SERIAL D16 movl $WC_COM, %edx D16 movb $0x61, %al outb (%dx) #endif D16 call cominit /* * Enable protected-mode, write protect, and alignment mask * %cr0 has already been initialsed to zero */ movl %cr0, %eax D16 orl $[CR0_PE|CR0_WP|CR0_AM], %eax movl %eax, %cr0 /* * Do a jmp immediately after writing to cr0 when enabling protected * mode to clear the real mode prefetch queue (per Intel's docs) */ jmp pestart pestart: #if LED D16 movl $WC_LED, %edx D16 movb $0xd2, %al outb (%dx) #endif #if SERIAL D16 movl $WC_COM, %edx D16 movb $0x62, %al outb (%dx) #endif /* * 16-bit protected mode is now active, so prepare to turn on long * mode */ #if LED D16 movl $WC_LED, %edx D16 movb $0xd3, %al outb (%dx) #endif #if SERIAL D16 movl $WC_COM, %edx D16 movb $0x63, %al outb (%dx) #endif /* * Add any initial cr4 bits */ movl %cr4, %eax A16 D16 orl CR4OFF, %eax /* * Enable PAE mode (CR4.PAE) */ D16 orl $CR4_PAE, %eax movl %eax, %cr4 #if LED D16 movl $WC_LED, %edx D16 movb $0xd4, %al outb (%dx) #endif #if SERIAL D16 movl $WC_COM, %edx D16 movb $0x64, %al outb (%dx) #endif /* * Point cr3 to the 64-bit long mode page tables. * * Note that these MUST exist in 32-bit space, as we don't have * a way to load %cr3 with a 64-bit base address for the page tables * until the CPU is actually executing in 64-bit long mode. */ A16 D16 movl CR3OFF, %eax movl %eax, %cr3 /* * Set long mode enable in EFER (EFER.LME = 1) */ D16 movl $MSR_AMD_EFER, %ecx rdmsr D16 orl $AMD_EFER_LME, %eax wrmsr #if LED D16 movl $WC_LED, %edx D16 movb $0xd5, %al outb (%dx) #endif #if SERIAL D16 movl $WC_COM, %edx D16 movb $0x65, %al outb (%dx) #endif /* * Finally, turn on paging (CR0.PG = 1) to activate long mode. */ movl %cr0, %eax D16 orl $CR0_PG, %eax movl %eax, %cr0 /* * The instruction after enabling paging in CR0 MUST be a branch. */ jmp long_mode_active long_mode_active: #if LED D16 movl $WC_LED, %edx D16 movb $0xd6, %al outb (%dx) #endif #if SERIAL D16 movl $WC_COM, %edx D16 movb $0x66, %al outb (%dx) #endif /* * Long mode is now active but since we're still running with the * original 16-bit CS we're actually in 16-bit compatability mode. * * We have to load an intermediate GDT and IDT here that we know are * in 32-bit space before we can use the kernel's GDT and IDT, which * may be in the 64-bit address space, and since we're in compatability * mode, we only have access to 16 and 32-bit instructions at the * moment. */ A16 D16 lgdt TEMPGDTOFF /* load temporary GDT */ A16 D16 lidt TEMPIDTOFF /* load temporary IDT */ /* * Do a far transfer to 64-bit mode. Set the CS selector to a 64-bit * long mode selector (CS.L=1) in the temporary 32-bit GDT and jump * to the real mode platter address of wc_long_mode_64 as until the * 64-bit CS is in place we don't have access to 64-bit instructions * and thus can't reference a 64-bit %rip. */ #if LED D16 movl $WC_LED, %edx D16 movb $0xd7, %al outb (%dx) #endif #if SERIAL D16 movl $WC_COM, %edx D16 movb $0x67, %al outb (%dx) #endif D16 pushl $TEMP_CS64_SEL A16 D16 pushl LM64OFF D16 lret /* * Support routine to re-initialize VGA subsystem */ vgainit: D16 ret /* * Support routine to re-initialize keyboard (which is USB - help!) */ kbdinit: D16 ret /* * Support routine to re-initialize COM ports to something sane */ cominit: / init COM1 & COM2 #if DEBUG /* * on debug kernels we need to initialize COM1 & COM2 here, so that * we can get debug output before the asy driver has resumed */ / select COM1 D16 movl $[COM1+LCR], %edx D16 movb $DLAB, %al / divisor latch outb (%dx) D16 movl $[COM1+DLL], %edx / divisor latch lsb D16 movb $B9600L, %al / divisor latch outb (%dx) D16 movl $[COM1+DLH], %edx / divisor latch hsb D16 movb $B9600H, %al / divisor latch outb (%dx) D16 movl $[COM1+LCR], %edx / select COM1 D16 movb $[STOP1|BITS8], %al / 1 stop bit, 8bit word len outb (%dx) D16 movl $[COM1+MCR], %edx / select COM1 D16 movb $[RTS|DTR], %al / data term ready & req to send outb (%dx) / select COM2 D16 movl $[COM2+LCR], %edx D16 movb $DLAB, %al / divisor latch outb (%dx) D16 movl $[COM2+DLL], %edx / divisor latch lsb D16 movb $B9600L, %al / divisor latch outb (%dx) D16 movl $[COM2+DLH], %edx / divisor latch hsb D16 movb $B9600H, %al / divisor latch outb (%dx) D16 movl $[COM2+LCR], %edx / select COM1 D16 movb $[STOP1|BITS8], %al / 1 stop bit, 8bit word len outb (%dx) D16 movl $[COM2+MCR], %edx / select COM1 D16 movb $[RTS|DTR], %al / data term ready & req to send outb (%dx) #endif /* DEBUG */ D16 ret .code64 .globl wc_long_mode_64 wc_long_mode_64: #if LED movw $WC_LED, %dx movb $0xd8, %al outb (%dx) #endif #if SERIAL movw $WC_COM, %dx movb $0x68, %al outb (%dx) #endif /* * We are now running in long mode with a 64-bit CS (EFER.LMA=1, * CS.L=1) so we now have access to 64-bit instructions. * * First, set the 64-bit GDT base. */ .globl rm_platter_pa movl rm_platter_pa, %eax lgdtq GDTROFF(%rax) /* load 64-bit GDT */ /* * Save the CPU number in %r11; get the value here since it's saved in * the real mode platter. */ / JAN / the following is wrong! need to figure out MP systems / movl CPUNOFF(%rax), %r11d /* * Add rm_platter_pa to %rsp to point it to the same location as seen * from 64-bit mode. */ addq %rax, %rsp /* * Now do an lretq to load CS with the appropriate selector for the * kernel's 64-bit GDT and to start executing 64-bit setup code at the * virtual address where boot originally loaded this code rather than * the copy in the real mode platter's rm_code array as we've been * doing so far. */ #if LED movw $WC_LED, %dx movb $0xd9, %al outb (%dx) #endif / JAN this should produce 'i' but we get 'g' instead ??? #if SERIAL movw $WC_COM, %dx movb $0x69, %al outb (%dx) #endif pushq $KCS_SEL pushq $kernel_wc_code lretq .globl kernel_wc_code kernel_wc_code: #if LED movw $WC_LED, %dx movb $0xda, %al outb (%dx) #endif / JAN this should produce 'j' but we get 'g' instead ??? #if SERIAL movw $WC_COM, %dx movb $0x6a, %al outb (%dx) #endif /* * Complete the balance of the setup we need to before executing * 64-bit kernel code (namely init rsp, TSS, LGDT, FS and GS). */ .globl rm_platter_va movq rm_platter_va, %rbx addq $WC_CPU, %rbx #if LED movw $WC_LED, %dx movb $0xdb, %al outb (%dx) #endif #if SERIAL movw $WC_COM, %dx movw $0x6b, %ax outb (%dx) #endif /* * restore the rest of the registers */ lidtq WC_IDT(%rbx) #if LED movw $WC_LED, %dx movb $0xdc, %al outb (%dx) #endif #if SERIAL movw $WC_COM, %dx movw $0x6c, %ax outb (%dx) #endif /* * restore the rest of the registers */ movw $KDS_SEL, %ax movw %ax, %ds movw %ax, %es movw %ax, %ss /* * Before proceeding, enable usage of the page table NX bit if * that's how the page tables are set up. */ movl x86_feature, %ecx andl $X86_NX, %ecx jz 1f movl $MSR_AMD_EFER, %ecx rdmsr orl $AMD_EFER_NXE, %eax wrmsr 1: movq WC_CR4(%rbx), %rax / restore full cr4 (with Global Enable) movq %rax, %cr4 lldt WC_LDT(%rbx) movzwq WC_TR(%rbx), %rax / clear TSS busy bit addq WC_GDT+2(%rbx), %rax andl $0xfffffdff, 4(%rax) movq 4(%rax), %rcx ltr WC_TR(%rbx) #if LED movw $WC_LED, %dx movb $0xdd, %al outb (%dx) #endif #if SERIAL movw $WC_COM, %dx movw $0x6d, %ax outb (%dx) #endif / restore %fsbase %gsbase %kgbase registers using wrmsr instruction movq WC_FS(%rbx), %rcx / restore fs register movw %cx, %fs movl $MSR_AMD_FSBASE, %ecx movl WC_FSBASE(%rbx), %eax movl WC_FSBASE+4(%rbx), %edx wrmsr movq WC_GS(%rbx), %rcx / restore gs register movw %cx, %gs movl $MSR_AMD_GSBASE, %ecx / restore gsbase msr movl WC_GSBASE(%rbx), %eax movl WC_GSBASE+4(%rbx), %edx wrmsr movl $MSR_AMD_KGSBASE, %ecx / restore kgsbase msr movl WC_KGSBASE(%rbx), %eax movl WC_KGSBASE+4(%rbx), %edx wrmsr movq WC_CR0(%rbx), %rdx movq %rdx, %cr0 movq WC_CR3(%rbx), %rdx movq %rdx, %cr3 movq WC_CR8(%rbx), %rdx movq %rdx, %cr8 #if LED movw $WC_LED, %dx movb $0xde, %al outb (%dx) #endif #if SERIAL movw $WC_COM, %dx movb $0x6e, %al outb (%dx) #endif / dummy up a stck so we can make C function calls movq WC_RSP(%rbx), %rsp /* * APIC initialization (we dummy up a stack so we can make this call) */ pushq $0 /* null frame pointer terminates stack trace */ movq %rsp, %rbp /* stack aligned on 16-byte boundary */ /* * skip iff function pointer is NULL */ cmpq $0, ap_mlsetup je 2f call *ap_mlsetup 2: call *cpr_start_cpu_func / restore %rbx to the value it ahd before we called the functions above movq rm_platter_va, %rbx addq $WC_CPU, %rbx movq WC_R8(%rbx), %r8 movq WC_R9(%rbx), %r9 movq WC_R10(%rbx), %r10 movq WC_R11(%rbx), %r11 movq WC_R12(%rbx), %r12 movq WC_R13(%rbx), %r13 movq WC_R14(%rbx), %r14 movq WC_R15(%rbx), %r15 / movq WC_RAX(%rbx), %rax movq WC_RBP(%rbx), %rbp movq WC_RCX(%rbx), %rcx / movq WC_RDX(%rbx), %rdx movq WC_RDI(%rbx), %rdi movq WC_RSI(%rbx), %rsi / assume that %cs does not need to be restored / %ds, %es & %ss are ignored in 64bit mode movw WC_SS(%rbx), %ss movw WC_DS(%rbx), %ds movw WC_ES(%rbx), %es #if LED movw $WC_LED, %dx movb $0xdf, %al outb (%dx) #endif #if SERIAL movw $WC_COM, %dx movb $0x6f, %al outb (%dx) #endif movq WC_RBP(%rbx), %rbp movq WC_RSP(%rbx), %rsp #if LED movw $WC_LED, %dx movb $0xe0, %al outb (%dx) #endif #if SERIAL movw $WC_COM, %dx movb $0x70, %al outb (%dx) #endif movq WC_RCX(%rbx), %rcx pushq WC_EFLAGS(%rbx) / restore flags popfq #if LED movw $WC_LED, %dx movb $0xe1, %al outb (%dx) #endif #if SERIAL movw $WC_COM, %dx movb $0x71, %al outb (%dx) #endif /* * can not use outb after this point, because doing so would mean using * %dx which would modify %rdx which is restored here */ movq %rbx, %rax movq WC_RDX(%rax), %rdx movq WC_RBX(%rax), %rbx popq %r14 popq %r13 popq %r12 leave movq WC_RETADDR(%rax), %rax movq %rax, (%rsp) / return to caller of wc_save_context xorl %eax, %eax / at wakeup return 0 ret SET_SIZE(wc_rm_start) ENTRY_NP(asmspin) movl %edi, %ecx A1: loop A1 SET_SIZE(asmspin) .globl wc_rm_end wc_rm_end: nop #elif defined(__i386) ENTRY_NP(wc_rm_start) /entry: jmp entry / stop here for HDT cli movw %cs, %ax movw %ax, %ds / establish ds ... movw %ax, %ss / ... and ss:esp D16 movl $WC_STKSTART, %esp #if LED D16 movl $WC_LED, %edx D16 movb $0xd1, %al outb (%dx) #endif #if SERIAL D16 movl $WC_COM, %edx D16 movb $0x61, %al outb (%dx) #endif D16 call vgainit D16 call kbdinit D16 call cominit #if LED D16 movl $WC_LED, %edx D16 movb $0xd2, %al outb (%dx) #endif #if SERIAL D16 movl $WC_COM, %edx D16 movb $0x62, %al outb (%dx) #endif D16 A16 movl $WC_CPU, %ebx / base add of wc_cpu_t #if LED D16 movb $0xd3, %al outb $WC_LED #endif #if SERIAL D16 movl $WC_COM, %edx D16 movb $0x63, %al outb (%dx) #endif D16 A16 movl %cs:WC_DS(%ebx), %edx / %ds post prot/paging transit #if LED D16 movb $0xd4, %al outb $WC_LED #endif D16 A16 lgdt %cs:WC_GDT(%ebx) / restore gdt and idtr D16 A16 lidt %cs:WC_IDT(%ebx) #if LED D16 movb $0xd5, %al outb $WC_LED #endif D16 A16 movl %cs:WC_CR4(%ebx), %eax / restore cr4 D16 andl $-1!CR4_PGE, %eax / don't set Global Enable yet movl %eax, %cr4 #if LED D16 movb $0xd6, %al outb $WC_LED #endif D16 A16 movl %cs:WC_CR3(%ebx), %eax / set PDPT movl %eax, %cr3 #if LED D16 movb $0xd7, %al outb $WC_LED #endif D16 A16 movl %cs:WC_CR0(%ebx), %eax / enable prot/paging, etc. movl %eax, %cr0 #if LED D16 movb $0xd8, %al outb $WC_LED #endif D16 A16 movl %cs:WC_VIRTADDR(%ebx), %ebx / virtaddr of wc_cpu_t #if LED D16 movb $0xd9, %al outb $WC_LED #endif #if LED D16 movb $0xda, %al outb $WC_LED #endif jmp flush / flush prefetch queue flush: D16 pushl $KCS_SEL D16 pushl $kernel_wc_code D16 lret / re-appear at kernel_wc_code /* * Support routine to re-initialize VGA subsystem */ vgainit: D16 ret /* * Support routine to re-initialize keyboard (which is USB - help!) */ kbdinit: D16 ret /* * Support routine to re-initialize COM ports to something sane for debug output */ cominit: #if DEBUG /* * on debug kernels we need to initialize COM1 & COM2 here, so that * we can get debug output before the asy driver has resumed */ / select COM1 D16 movl $[COM1+LCR], %edx D16 movb $DLAB, %al / divisor latch outb (%dx) D16 movl $[COM1+DLL], %edx / divisor latch lsb D16 movb $B9600L, %al / divisor latch outb (%dx) D16 movl $[COM1+DLH], %edx / divisor latch hsb D16 movb $B9600H, %al / divisor latch outb (%dx) D16 movl $[COM1+LCR], %edx / select COM1 D16 movb $[STOP1|BITS8], %al / 1 stop bit, 8bit word len outb (%dx) D16 movl $[COM1+MCR], %edx / select COM1 D16 movb $[RTS|DTR], %al / 1 stop bit, 8bit word len outb (%dx) / select COM2 D16 movl $[COM2+LCR], %edx D16 movb $DLAB, %al / divisor latch outb (%dx) D16 movl $[COM2+DLL], %edx / divisor latch lsb D16 movb $B9600L, %al / divisor latch outb (%dx) D16 movl $[COM2+DLH], %edx / divisor latch hsb D16 movb $B9600H, %al / divisor latch outb (%dx) D16 movl $[COM2+LCR], %edx / select COM1 D16 movb $[STOP1|BITS8], %al / 1 stop bit, 8bit word len outb (%dx) D16 movl $[COM2+MCR], %edx / select COM1 D16 movb $[RTS|DTR], %al / 1 stop bit, 8bit word len outb (%dx) #endif /* DEBUG */ D16 ret .globl wc_rm_end wc_rm_end: nop .globl kernel_wc_code kernel_wc_code: / At this point we are with kernel's cs and proper eip. / We will be executing not from the copy in real mode platter, / but from the original code where boot loaded us. / By this time GDT and IDT are loaded as is cr0, cr3 and cr4. / %ebx is wc_cpu / %dx is our ds #if LED D16 movb $0xdb, %al outb $WC_LED #endif / got here OK movw %dx, %ds / $KDS_SEL #if LED movb $0xdc, %al outb $WC_LED #endif /* * Before proceeding, enable usage of the page table NX bit if * that's how the page tables are set up. */ movl x86_feature, %ecx andl $X86_NX, %ecx jz 1f movl $MSR_AMD_EFER, %ecx rdmsr orl $AMD_EFER_NXE, %eax wrmsr 1: movl WC_CR4(%ebx), %eax / restore full cr4 (with Global Enable) movl %eax, %cr4 lldt WC_LDT(%ebx) / $LDT_SEL movzwl WC_TR(%ebx), %eax / clear TSS busy bit addl WC_GDT+2(%ebx), %eax andl $-1!0x200, 4(%eax) ltr WC_TR(%ebx) / $UTSS_SEL movw WC_SS(%ebx), %ss / lssl WC_ESP(%ebx), %esp movl WC_ESP(%ebx), %esp / ^ don't use, asm busted! movl WC_RETADDR(%ebx), %eax / return to caller of wc_save_context movl %eax, (%esp) movw WC_ES(%ebx), %es / restore segment registers movw WC_FS(%ebx), %fs movw WC_GS(%ebx), %gs /* * APIC initialization, skip iff function pointer is NULL */ cmpl $0, ap_mlsetup je 2f call *ap_mlsetup 2: call *cpr_start_cpu_func pushl WC_EFLAGS(%ebx) / restore flags popfl movl WC_EDI(%ebx), %edi / restore general registers movl WC_ESI(%ebx), %esi movl WC_EBP(%ebx), %ebp movl WC_EBX(%ebx), %ebx /exit: jmp exit / stop here for HDT xorl %eax, %eax / at wakeup return 0 ret SET_SIZE(wc_rm_start) #endif /* defined(__amd64) */ #endif /* !defined(__GNU_AS__) */ #endif /* lint */