101 lines
3.4 KiB
C
101 lines
3.4 KiB
C
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/*
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* Copyright (c) 2020-2021 Apple Inc. All rights reserved.
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*/
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#ifndef log_mem_h
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#define log_mem_h
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#include <stddef.h>
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#include <stdint.h>
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#include <sys/param.h>
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/*
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* A simple allocator on a top of a plain byte array. Primarily intended to
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* support OS kernel logging in order to avoid dependency to VM.
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*/
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typedef struct logmem_s {
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lck_spin_t lm_lock;
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uint8_t *lm_mem;
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uint8_t *lm_mem_map;
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size_t lm_mem_size;
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size_t lm_cap_order;
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size_t lm_min_order;
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size_t lm_max_order;
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uint32_t lm_cnt_allocations;
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uint32_t lm_cnt_failed_size;
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uint32_t lm_cnt_failed_full;
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uint32_t lm_cnt_failed_lmoff;
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uint32_t lm_cnt_free;
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} logmem_t;
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/*
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* Initializes dynamically allocated logmem. The caller is responsible for
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* allocating and providing backing memory for both data and the bitmap.
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* LOGMEM_SIZE and LOGMEM_MAP_SIZE provide a way to determine the right sizes.
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*/
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void logmem_init(logmem_t *, void *, size_t, size_t, size_t, size_t);
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/*
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* Returns true if the logmem is initialized, false otherwise.
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*/
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bool logmem_ready(const logmem_t *);
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/*
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* Allocates memory from a respective logmem. Returns a pointer to the beginning
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* of the allocated block. The resulting size of the allocated block is equal or
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* bigger than the size passed in during the call. The function comes in two
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* flavours, locking and non-locking. The caller is responsible for choosing the
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* right one based on where and how the logmem is used.
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*/
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void *logmem_alloc(logmem_t *, size_t *);
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void *logmem_alloc_locked(logmem_t *, size_t *);
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/*
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* Frees memory previously allocated by logmem_alloc*(). The caller must call
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* logmem_free*() with exact pointer and size value returned by logmem_alloc*().
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* The function comes in two flavours, locking and non-locking. The caller is
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* responsible for choosing the right one based on where and how the logmem is
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* used.
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*/
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void logmem_free(logmem_t *, void *, size_t);
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void logmem_free_locked(logmem_t *, void *, size_t);
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/*
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* Returns the maximum memory size allocatable by the logmem.
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*/
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size_t logmem_max_size(const logmem_t *);
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/*
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* Returns true if logmem is empty, false otherwise.
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*/
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bool logmem_empty(const logmem_t *);
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/*
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* Returns an amount of memory the logmem needs to be initialized with in order
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* to provide allocations and to maintain its internal state. The caller should
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* use this function to get the right amount, allocate the memory accodingly and
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* pass it to logmem_init().
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*/
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size_t logmem_required_size(size_t, size_t);
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#endif /* log_mem_h */
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