forked from Imagelibrary/rtems
6c9f0176a9
- Add support for architecure sections that can be handled by the architecture back end. - Add trampoline/fixup support for PowerPC. This means the PowerPC now supports large memory loading of applications. - Add a bit allocator to manage small block based regions of memory. - Add small data (sdata/sbss) support for the PowerPC. The support makes the linker allocated small data region of memory a global resource available to libdl loaded object files. Updates #3687 Updates #3685
83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/*
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* COPYRIGHT (c) 2019 Chris Johns <chrisj@rtems.org>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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/**
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* @file
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*
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* @ingroup rtems_rtl
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*
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* @brief RTEMS Run-Time Linker Bit Allocator Header
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*/
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#if !defined (_RTEMS_RTL_BIT_ALLOC_H_)
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#define _RTEMS_RTL_BIT_ALLOC_H_
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#include <rtems/rtl/rtl-fwd.h>
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#include <rtems/rtl/rtl-obj-fwd.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/**
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* Bit Allocator data
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*/
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typedef struct rtems_rtl_bit_alloc
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{
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uint8_t* base; /**< The memory being allocated. */
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size_t size; /**< The number of bytes of memory being managed. */
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uint32_t* bits; /**< The bit map indicating which blocks are allocated. */
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size_t block_size; /**< The size of a block, the minimum allocation unit. */
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size_t blocks; /**< The number of blocks in the memory. */
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} rtems_rtl_bit_alloc;
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/**
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* Open a bit allocator. The allocator allocates block_size pieces of the memory
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* being managed.
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*
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* @param base The memory to managem NULL to allocate a piece of memory.
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* @param size The size of the memory being managed in bytes.
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* @param block_size The minimum allocation unit in bytes.
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* @param used The amount of memory already in use in bytes.
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* @retval rtems_rtl_bit_alloc The bit allocator structure.
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*/
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rtems_rtl_bit_alloc* rtems_rtl_bit_alloc_open (void* base,
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size_t size,
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size_t block_size,
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size_t used);
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/**
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* Close the bit allocator.
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*
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* @param balloc The allocator to close.
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*/
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void rtems_rtl_bit_alloc_close (rtems_rtl_bit_alloc* balloc);
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/**
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* Allocate a piece of memory being managed. The size is in bytes are is rounded
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* up the next block size.
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*
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* @param balloc The allocator.
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* @param size Number of bytes to allocate.
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* @return void* The memory if the allocation is successful else NULL if there
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* is no more memory.
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*/
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void* rtems_rtl_bit_alloc_balloc (rtems_rtl_bit_alloc* balloc, size_t size);
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/**
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* Free an allocated memory block. The size is required because the allocator does not
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* contain any state information.
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*/
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void rtems_rtl_bit_alloc_bfree (rtems_rtl_bit_alloc* balloc, void* addr, size_t size);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif
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