179 lines
3.7 KiB
ArmAsm
179 lines
3.7 KiB
ArmAsm
/*
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* \brief Startup code for core
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* \author Martin Stein
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* \author Stefan Kalkowski
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* \date 2011-10-01
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*/
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/*
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* Copyright (C) 2011-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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.include "macros.s"
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.section ".text.crt0"
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/* magic multi-boot header to make GRUB happy */
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.long 0x1badb002
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.long 0x0
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.long 0xe4524ffe
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/**********************************
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** Startup code for primary CPU **
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**********************************/
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.code32
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.global _start
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_start:
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/* Enable PAE (prerequisite for IA-32e mode) */
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movl %cr4, %eax
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btsl $5, %eax
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movl %eax, %cr4
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/* Load initial pagetables */
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leal _kernel_pml4, %eax
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mov %eax, %cr3
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/* Enable IA-32e mode and execute-disable */
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movl $0xc0000080, %ecx
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rdmsr
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btsl $8, %eax
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btsl $11, %eax
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wrmsr
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/* Enable paging, write protection, caching and FPU error reporting */
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movl %cr0, %eax
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btsl $5, %eax
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btsl $16, %eax
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btrl $29, %eax
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btrl $30, %eax
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btsl $31, %eax
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movl %eax, %cr0
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/* Set up GDT */
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lgdt _gdt_ptr
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/* Indirect long jump to 64-bit code */
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ljmp $8, $_start64
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.code64
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_start64: .p2align MIN_PAGE_SIZE_LOG2
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/*
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* Set up kernel segment selectors
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*/
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mov $0x10, %eax
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mov %eax, %ss
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mov %eax, %ds
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mov %eax, %es
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mov %eax, %fs
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mov %eax, %gs
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/*
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* Install initial temporary environment that is replaced later by the
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* environment that init_main_thread creates.
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*/
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leaq _stack_high@GOTPCREL(%rip),%rax
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movq (%rax), %rsp
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/* uniprocessor kernel-initialization which activates multiprocessor */
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call init_kernel_up
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/*********************************************
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** Startup code that is common to all CPUs **
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*********************************************/
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.global _start_secondary_cpus
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_start_secondary_cpus:
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/* do multiprocessor kernel-initialization */
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call init_kernel_mp
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/* call the kernel main-routine */
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call kernel
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/* catch erroneous return of the kernel main-routine */
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1: jmp 1b
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/*********************************
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** .bss (non-initialized data) **
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*********************************/
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.bss
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/* stack of the temporary initial environment */
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.p2align 8
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.space 32 * 1024
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_stack_high:
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.data
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/****************************************
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** Initial pagetables **
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** Identity mapping from 2MiB to 4MiB **
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****************************************/
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/* PML4 */
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.p2align MIN_PAGE_SIZE_LOG2
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_kernel_pml4:
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.quad _kernel_pdp + 0xf
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.fill 511, 8, 0x0
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/* PDP */
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.p2align MIN_PAGE_SIZE_LOG2
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_kernel_pdp:
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.quad _kernel_pd + 0xf
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.fill 511, 8, 0x0
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/* PD */
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.p2align MIN_PAGE_SIZE_LOG2
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_kernel_pd:
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.quad 0
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.quad 0x20018f
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.fill 510, 8, 0x0
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/*******************************************
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** Global Descriptor Table **
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** See Intel SDM Vol. 3A, section 3.5.1. **
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*******************************************/
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.align 4
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.space 2
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_gdt_ptr:
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.word _gdt_end - _gdt_start - 1 /* limit */
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.long _gdt_start /* base address */
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.align 8
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_gdt_start:
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/* Null descriptor */
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.quad 0
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/* 64-bit code segment descriptor */
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.long 0
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/* GDTE_LONG | GDTE_PRESENT | GDTE_CODE | GDTE_NON_SYSTEM */
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.long 0x209800
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/* 64-bit data segment descriptor */
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.long 0
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/* GDTE_LONG | GDTE_PRESENT | GDTE_TYPE_DATA_A | GDTE_TYPE_DATA_W | GDTE_NON_SYSTEM */
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.long 0x209300
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/* 64-bit user code segment descriptor */
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.long 0
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/* GDTE_LONG | GDTE_PRESENT | GDTE_CODE | GDTE_NON_SYSTEM */
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.long 0x20f800
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/* 64-bit user data segment descriptor */
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.long 0
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/* GDTE_LONG | GDTE_PRESENT | GDTE_TYPE_DATA_A | GDTE_TYPE_DATA_W | GDTE_NON_SYSTEM */
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.long 0x20f300
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/* Task segment descriptor */
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.long 0x01000068
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/* GDTE_PRESENT | GDTE_SYS_TSS */
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.long 0x893a
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.long 0
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.long 0
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_gdt_end:
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