/* $OpenBSD: mptramp.S,v 1.23 2024/07/12 13:10:58 deraadt Exp $ */ /* $NetBSD: mptramp.S,v 1.1 2003/04/26 18:39:30 fvdl Exp $ */ /*- * Copyright (c) 2000 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by RedBack Networks Inc. * * Author: Bill Sommerfeld * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Copyright (c) 1999 Stefan Grefen * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR AND CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * MP startup ... * the stuff from cpu_spinup_trampoline to mp_startup * is copied into the first 640 KB * * We startup the processors now when the kthreads become ready. * The steps are: * 1) Get the processors running kernel-code from a special * page-table and stack page, do chip identification. * 2) halt the processors waiting for them to be enabled * by a idle-thread */ #include "assym.h" #include <machine/param.h> #include <machine/asm.h> #include <machine/specialreg.h> #include <machine/segments.h> #include <machine/mpbiosvar.h> #include <machine/i82489reg.h> #ifdef __clang__ #define addr32 #endif #define _TRMP_LABEL(a) a = . - cpu_spinup_trampoline + MP_TRAMPOLINE #define _TRMP_OFFSET(a) a = . - cpu_spinup_trampoline #define _TRMP_DATA_LABEL(a) a = . - mp_tramp_data_start + MP_TRAMP_DATA #define _TRMP_DATA_OFFSET(a) a = . - mp_tramp_data_start .global cpu_spinup_trampoline_end .global mp_tramp_data_start .global mp_tramp_data_end /* * Initial copy of this code gets placed in .rodata, kernel * makes RX copy of it in the MP trampoline page. */ .section .rodata .align 4, 0xcc .code16 GENTRY(cpu_spinup_trampoline) cli movw $(MP_TRAMP_DATA >> 4), %ax movw %ax, %ds movw %cs, %ax movw %ax, %es movw %ax, %ss addr32 lgdtl (.Lmptramp_gdt32_desc) # load flat descriptor table movl %cr0, %eax # get cr0 orl $CR0_PE, %eax # enable protected mode movl %eax, %cr0 # doit ljmpl $0x8, $.Lmp_startup _TRMP_LABEL(.Lmp_startup) .code32 movl $0x10, %eax # data segment movw %ax, %ds movw %ax, %ss movw %ax, %es movw %ax, %fs movw %ax, %gs movl $(MP_TRAMP_DATA + NBPG - 16),%esp # bootstrap stack end, # with scratch space.. /* First, reset the PSL. */ pushl $PSL_MBO popfl movl %cr4,%eax orl $(CR4_DEFAULT),%eax movl %eax,%cr4 movl $MSR_EFER,%ecx rdmsr movl %edx, %edi # %edx is needed by wrmsr below # Check if we need to enable NXE movl $0x80000001, %eax cpuid andl $CPUID_NXE, %edx xorl %eax,%eax testl %edx, %edx jz 1f orl $EFER_NXE, %eax 1: orl $(EFER_LME|EFER_SCE), %eax movl %edi, %edx # Restore saved %edx movl $MSR_EFER,%ecx wrmsr movl $mp_pdirpa, %ecx movl (%ecx), %ecx movl %ecx,%cr3 # load ptd addr into mmu movl $GSEL(GDATA_SEL, SEL_KPL),%eax #switch to new segment movl %eax,%ds movl %eax,%es movl %eax,%ss movl $.Lmptramp_gdt64_desc,%eax lgdt (%eax) xorw %ax, %ax movw %ax, %fs movl $.Lmptramp_jmp64,%eax movl %cr0,%ecx # get control word orl $CR0_DEFAULT,%ecx movl %ecx, %cr0 ljmp *(%eax) _TRMP_LABEL(.Lmptramp_longmode) .code64 movabsq $cpu_spinup_finish,%rax jmp *%rax .type cpu_spinup_trampoline_end,@object cpu_spinup_trampoline_end: #end of code copied to MP_TRAMPOLINE END(cpu_spinup_trampoline) .text GENTRY(cpu_spinup_finish) movl x2apic_enabled,%eax testl %eax,%eax jz 1f mov $MSR_APICBASE,%ecx mov $0,%edx rdmsr orl $APICBASE_ENABLE_X2APIC,%eax wrmsr mov $MSR_X2APIC_ID,%ecx rdmsr andl $X2APIC_ID_MASK,%eax jmp 2f 1: movl local_apic+LAPIC_ID,%eax shrl $LAPIC_ID_SHIFT,%eax 2: xorq %rcx,%rcx 3: movq cpu_info(,%rcx,8),%rdi incq %rcx movl CPU_INFO_APICID(%rdi),%edx cmpl %eax,%edx jne 3b movq CPU_INFO_IDLE_PCB(%rdi),%rsi movq PCB_RSP(%rsi),%rsp movq PCB_RBP(%rsi),%rbp movq CPU_INFO_GDT(%rdi),%rax movw $(GDT_SIZE-1),-10(%rsp) movq %rax,-8(%rsp) lgdt -10(%rsp) /* Switch address space. */ movq PCB_CR3(%rsi),%rax movq %rax,%cr3 movl $CR0_DEFAULT,%eax movq %rax,%cr0 call cpu_hatch movq $0,-8(%rsp) END(cpu_spinup_finish) /* NOTREACHED */ .section .rodata .type mp_tramp_data_start,@object mp_tramp_data_start: _TRMP_DATA_LABEL(.Lmptramp_jmp64) .long .Lmptramp_longmode .word GSEL(GCODE_SEL, SEL_KPL) .global mp_pdirpa .type mp_pdirpa,@object _TRMP_DATA_LABEL(mp_pdirpa) .long 0 .size mp_pdirpa,4 _TRMP_DATA_LABEL(.Lmptramp_gdt32) .quad 0x0000000000000000 .quad 0x00cf9f000000ffff .quad 0x00cf93000000ffff _TRMP_DATA_OFFSET(.Lmptramp_gdt32_desc) .word 0x17 .long .Lmptramp_gdt32 _TRMP_DATA_LABEL(.Lmptramp_gdt64) .quad 0x0000000000000000 .quad 0x00af9a000000ffff .quad 0x00cf92000000ffff _TRMP_DATA_LABEL(.Lmptramp_gdt64_desc) .word 0x17 .long .Lmptramp_gdt64 .type mp_tramp_data_end,@object mp_tramp_data_end: END(mp_tramp_data_start)
