135 lines
4.3 KiB
C
135 lines
4.3 KiB
C
/*
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* Copyright (c) 2010, Stefan Lankes, RWTH Aachen University
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @author Stefan Lankes
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* @file include/eduos/stdlib.h
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* @brief Kernel space malloc and free functions and conversion functions
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*
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* This file contains some memory alloc and free calls for the kernel
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* and conversion functions.
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*/
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#ifndef __STDLIB_H__
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#define __STDLIB_H__
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#include <eduos/config.h>
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#include <eduos/stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** @brief General page allocator function
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*
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* This function allocates and maps whole pages.
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* Mapped memory will be tracked by the VMA subsystem.
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* The sz argument is rounded down to multiples of the page size.
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*
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* For allocations which are smaller than a page you should use
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* the buddy system allocator (kmalloc and kfree) to avoid fragmentation.
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*
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* @param sz Desired size of the new memory
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* @param flags Flags to for map_region(), vma_add()
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*
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* @return Pointer to the new memory range (page-aligned).
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*/
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void* palloc(size_t sz, uint32_t flags);
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/** @brief Free general kernel pages
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*
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* This function removes the memory from the VMA subsystem,
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* unmap the pages and releases the physical pages.
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*
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* The pmalloc() doesn't track how much memory was allocated for which pointer,
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* so you have to specify how much memory shall be freed.
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*
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* @param addr The virtual address returned by palloc().
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* @param sz The size which should freed
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*/
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void pfree(void* addr, size_t sz);
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/** @brief The memory allocator function
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*
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* This allocator uses a buddy system to allocate memory.
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* Attention: memory is not aligned!
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*
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* @return Pointer to the new memory range
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*/
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void* kmalloc(size_t sz);
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/** @brief Release memory back to the buddy system
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*
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* Every block of memory allocated by kmalloc() is prefixed with a buddy_t
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* which includes the the size of the allocated block.
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* This prefix is also used to re-insert the block into the linked list
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* of free buddies.
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*
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* Released memory will still be managed by the buddy system.
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* Pages are not unmapped.
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*
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* Note: adjacent buddies are currently not merged!
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*
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* @see buddy_t
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* @param addr The address to the memory block allocated by kmalloc()
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*/
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void kfree(void* addr);
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/** @brief Create a new stack for a new task
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*
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* @return start address of the new stack
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*/
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void* create_stack(tid_t id);
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/** @brief String to long
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*
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* @return Long value of the parsed numerical string
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*/
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long strtol(const char* str, char** endptr, int base);
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/** @brief String to unsigned long
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*
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* @return Unsigned long value of the parsed numerical string
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*/
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unsigned long strtoul(const char* nptr, char** endptr, int base);
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/** @brief ASCII to integer
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*
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* Convenience function using strtol().
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*
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* @return Integer value of the parsed numerical string
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*/
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static inline int atoi(const char *str)
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{
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return (int)strtol(str, (char **)NULL, 10);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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