170 lines
4.5 KiB
C
170 lines
4.5 KiB
C
/*
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* Copyright (c) 2013-2014, Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* DESCRIPTION
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* Platform independent, commonly used macros and defines related to linker
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* script.
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*
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* This file may be included by:
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* - Linker script files: for linker section declarations
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* - C files: for external declaration of address or size of linker section
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* - Assembly files: for external declaration of address or size of linker
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* section
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*/
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#ifndef _LINKERDEFS_H
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#define _LINKERDEFS_H
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#include <toolchain.h>
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#include <sections.h>
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/* include platform dependent linker-defs */
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#ifdef CONFIG_X86
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/* Nothing yet to include */
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#elif defined(CONFIG_ARM)
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/* Nothing yet to include */
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#elif defined(CONFIG_ARC)
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/* Nothing yet to include */
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#elif defined(CONFIG_NIOS2)
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/* Nothing yet to include */
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#else
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#error Arch not supported.
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#endif
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#ifdef _LINKER
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/*
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* Space for storing per device busy bitmap. Since we do not know beforehand
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* the number of devices, we go through the below mechanism to allocate the
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* required space.
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*/
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#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
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#define DEVICE_COUNT \
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((__device_init_end - __device_init_start) / _DEVICE_STRUCT_SIZE)
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#define DEV_BUSY_SZ (((DEVICE_COUNT + 31) / 32) * 4)
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#define DEVICE_BUSY_BITFIELD() \
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FILL(0x00) ; \
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__device_busy_start = .; \
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. = . + DEV_BUSY_SZ; \
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__device_busy_end = .;
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#else
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#define DEVICE_BUSY_BITFIELD()
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#endif
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/*
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* generate a symbol to mark the start of the device initialization objects for
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* the specified level, then link all of those objects (sorted by priority);
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* ensure the objects aren't discarded if there is no direct reference to them
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*/
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#define DEVICE_INIT_LEVEL(level) \
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__device_##level##_start = .; \
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KEEP(*(SORT(.init_##level[0-9]))); \
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KEEP(*(SORT(.init_##level[1-9][0-9]))); \
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/*
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* link in device initialization objects for all devices that are automatically
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* initialized by the kernel; the objects are sorted in the order they will be
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* initialized (i.e. ordered by level, sorted by priority within a level)
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*/
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#define DEVICE_INIT_SECTIONS() \
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__device_init_start = .; \
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DEVICE_INIT_LEVEL(PRE_KERNEL_1) \
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DEVICE_INIT_LEVEL(PRE_KERNEL_2) \
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DEVICE_INIT_LEVEL(POST_KERNEL) \
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DEVICE_INIT_LEVEL(APPLICATION) \
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DEVICE_INIT_LEVEL(PRIMARY) \
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DEVICE_INIT_LEVEL(SECONDARY) \
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DEVICE_INIT_LEVEL(NANOKERNEL) \
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DEVICE_INIT_LEVEL(MICROKERNEL) \
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__device_init_end = .; \
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DEVICE_BUSY_BITFIELD() \
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/* define a section for undefined device initialization levels */
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#define DEVICE_INIT_UNDEFINED_SECTION() \
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KEEP(*(SORT(.init_[_A-Z0-9]*))) \
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/*
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* link in shell initialization objects for all modules that use shell and
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* their shell commands are automatically initialized by the kernel.
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*/
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#define SHELL_INIT_SECTIONS() \
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__shell_cmd_start = .; \
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KEEP(*(".shell_*")); \
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__shell_cmd_end = .;
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#ifdef CONFIG_X86 /* LINKER FILES: defines used by linker script */
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/* Should be moved to linker-common-defs.h */
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#if defined(CONFIG_XIP)
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#define ROMABLE_REGION ROM
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#else
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#define ROMABLE_REGION RAM
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#endif
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#endif
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/*
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* If image is loaded via kexec Linux system call, then program
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* headers need to be page aligned.
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* This can be done by section page aligning.
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*/
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#ifdef CONFIG_BOOTLOADER_KEXEC
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#define KEXEC_PGALIGN_PAD(x) . = ALIGN(x);
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#else
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#define KEXEC_PGALIGN_PAD(x)
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#endif
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#elif defined(_ASMLANGUAGE)
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/* Assembly FILES: declaration defined by the linker script */
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GDATA(__bss_start)
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GDATA(__bss_num_words)
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#ifdef CONFIG_XIP
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GDATA(__data_rom_start)
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GDATA(__data_ram_start)
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GDATA(__data_num_words)
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#endif
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#else /* ! _ASMLANGUAGE */
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#include <stdint.h>
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extern char __bss_start[];
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extern char __bss_end[];
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#ifdef CONFIG_XIP
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extern char __data_rom_start[];
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extern char __data_ram_start[];
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extern char __data_ram_end[];
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#endif
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extern char _image_rom_start[];
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extern char _image_rom_end[];
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extern char _image_ram_start[];
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extern char _image_ram_end[];
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extern char _image_text_start[];
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extern char _image_text_end[];
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/* end address of image. */
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extern char _end[];
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#endif /* ! _ASMLANGUAGE */
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#endif /* _LINKERDEFS_H */
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