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125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/*
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* Copyright (C) 2014 René Kijewski <rene.kijewski@fu-berlin.de>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* Layout of the kernel memory. The symbols are set in the linker.ld.
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*
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* @ingroup x86
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* @{
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* @file
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* @author René Kijewski <rene.kijewski@fu-berlin.de>
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*/
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#ifndef KERNEL_MEMORY_H__
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#define KERNEL_MEMORY_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief First byte inside the elf segments.
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*
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* Expected to be the start of the high memory, i.e. 1MB.
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*/
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extern char _kernel_memory_start;
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/**
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* @brief Start of first byte of code inside the .text segment.
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*
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* This symbol does not have to be aligned.
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*/
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extern char _section_text_start;
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/**
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* @brief First byte after the code.
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*
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* This symbol does not have to be aligned.
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*/
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extern char _section_text_end;
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/**
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* @brief First byte inside the .rodata segment.
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*
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* This symbol is expected to be aligned.
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*/
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extern char _section_rodata_start;
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/**
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* @brief First byte after the .rodata segment.
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*
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* This symbol does not have to be aligned.
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*/
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extern char _section_rodata_end;
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/**
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* @brief First byte inside the .data segment.
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*
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* This symbol is expected to be aligned.
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*/
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extern char _section_data_start;
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/**
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* @brief First byte after the .data segment.
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*
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* This symbol does not have to be aligned, since it shares the same previleges as the .bss segment.
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*/
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extern char _section_data_end;
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/**
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* @brief Start of the .bss segment.
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*
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* Probably unaligned.
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* The .bss segment must follow the .data segment with no other segment inbetween.
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* It's likely that `&_section_data_end == &_section_bss_start`.
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*/
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extern char _section_bss_start;
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/**
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* @brief First byte after the .bss segment.
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*
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* This symbol should not to be aligned, because RAM cycles would be wasted to clear unused bytes otherwise.
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*/
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extern char _section_bss_end;
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/**
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* @brief First byte after the last of the common elf segments.
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*
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* This symbol is expected to be aligned.
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* The "common elf segments" are .text, .rodata, .data and .bss.
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* All the (physical) memory beyond this point will be overwritten at the pleasure of the kernel.
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*/
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extern char _kernel_memory_end;
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/**
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* @brief First byte that may be mapped as the heap
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*
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* This symbol is expected to be aligned.
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* Must be bigger than _kernel_memory_end.
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* There should be a space between _kernel_memory_end and _heap_start, but it does not have to.
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*/
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extern char _heap_start;
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#ifdef __cplusplus
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}
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#endif
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#endif
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/** @} */
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