4e97a6511b
* Instead of always re-load page-tables when a thread context is switched only do this when another user PD's thread is the next target, core-threads are always executed within the last PD's page-table set * remove the concept of the mode transition * instead map the exception vector once in bootstrap code into kernel's memory segment * when a new page directory is constructed for a user PD, copy over the top-level kernel segment entries on RISCV and X86, on ARM we use a designated page directory register for the kernel segment * transfer the current CPU id from bootstrap to core/kernel in a register to ease first stack address calculation * align cpu context member of threads and vms, because of x86 constraints regarding the stack-pointer loading * introduce Align_at template for members with alignment constraints * let the x86 hardware do part of the context saving in ISS, by passing the thread context into the TSS before leaving to user-land * use one exception vector for all ARM platforms including Arm_v6 Fix #2091
56 lines
1.1 KiB
ArmAsm
56 lines
1.1 KiB
ArmAsm
/**
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* \brief Startup code for core on ARM
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* \author Stefan Kalkowski
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* \date 2015-03-06
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*/
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/*
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* Copyright (C) 2015-2017 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 Affero General Public License version 3.
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*/
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.section ".text"
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/***********************
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** kernel entry code **
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***********************/
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.global _start
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_start:
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/* switch to cpu-specific kernel stack */
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adr r1, _kernel_stack
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adr r2, _kernel_stack_size
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ldr r1, [r1]
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ldr r2, [r2]
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ldr r2, [r2]
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add r0, #1
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mul r0, r0, r2
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add sp, r1, r0
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/* jump into init C code */
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b kernel_init
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_kernel_stack: .long kernel_stack
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_kernel_stack_size: .long kernel_stack_size
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/*********************************
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** core main thread entry code **
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*********************************/
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.global _core_start
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_core_start:
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/* create proper environment for main thread */
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bl init_main_thread
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/* apply environment that was created by init_main_thread */
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ldr sp, =init_main_thread_result
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ldr sp, [sp]
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/* jump into init C code instead of calling it as it should never return */
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b _main
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