2011-12-22 16:19:25 +01:00
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/*
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* \brief Startup code for kernel main routine on microblaze
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* \author Martin Stein
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* \date 2010-06-21
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*/
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/*
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2012-01-03 15:35:05 +01:00
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* Copyright (C) 2010-2012 Genode Labs GmbH
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2011-12-22 16:19:25 +01:00
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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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/* platform includes */
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.include "errors.s"
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.include "linker_commands.s"
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/*
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* To be compatible to crt0.s for common programs,
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* the following labels are used for roottasks main-thread
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*/
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.global _main_utcb_addr
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/*
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* Here you can denote an instruction pointer to
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* call after kernel execution returns (e.g. userland entry)
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*/
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.global _call_after_kernel
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/* top of kernel stack is used when we have to reset the kernel
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* context, for example when we enter the kernel from userland
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*/
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.global _kernel_stack_top
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/* kernel returns to this label after execution
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*/
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.global _exit_kernel
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/* pointer to kernel main routine */
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.extern _kernel
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/*******************************
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** Macros for _start routine **
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*******************************/
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.macro _CALL_AFTER_KERNEL__USES_R3_R15
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lwi r3, r0, _call_after_kernel
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beqi r3, _no_call_after_kernel
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addi r15, r0, _exit_call_after_kernel-2*4
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bra r3
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_exit_call_after_kernel:
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_no_call_after_kernel:
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.endm
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.macro _CALL_KERNEL__USES_R15
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addi r1, r0, _kernel_stack_top
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addi r15, r0, _exit_kernel-2*4
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brai _kernel
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or r0, r0, r0
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_exit_kernel:
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.endm
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/********************
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** _start_routine **
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********************
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/* linker links this section to kernelbase + offset 0 */
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_BEGIN_ELF_ENTRY_CODE
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_CALL_KERNEL__USES_R15
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_CALL_AFTER_KERNEL__USES_R3_R15
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_ERROR_NOTHING_LEFT_TO_CALL_BY_CRT0
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_BEGIN_READABLE_WRITEABLE
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.align 4
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_main_utcb_addr: .space 4*1
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.align 4
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_call_after_kernel: .space 4*1
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.align 4
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_kernel_stack_base: .space 1024*1024
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_kernel_stack_top:
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