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bdf7da5b08
source files mainly done by Randall. Signed-off-by: Randall Spangler <rspangler@chromium.org> Change-Id: Iaff83a842b17f3350fb6f2a3f1597ad4c29bd12a
40 lines
1.4 KiB
C
40 lines
1.4 KiB
C
/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* Shared memory interface for Chrome EC.
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*
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* This is intended to supply a relatively large block of memory for
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* use by a task for a relatively short amount of time. For example,
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* verified boot may need a buffer to hold signature data during a
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* verification operation. It is NOT intended for allocating
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* long-term buffers; those should in general be static variables
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* allocated at compile-time. It is NOT a full-featured replacement
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* for malloc() / free(). */
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#ifndef __CROS_EC_SHARED_MEM_H
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#define __CROS_EC_SHARED_MEM_H
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#include "common.h"
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/* Initializes the module. */
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int shared_mem_init(void);
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/* Returns the maximum amount of shared memory which can be acquired,
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* in bytes. */
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int shared_mem_size(void);
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/* Acquires a shared memory area of the requested size in bytes. If
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* wait != 0, will wait for the area to be available; if wait == 0,
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* will fail with EC_ERROR_BUSY if the request cannot be fulfilled
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* immediately. On success, sets *dest_ptr to the start of the memory
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* area and returns EC_SUCCESS. */
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int shared_mem_acquire(int size, int wait, char **dest_ptr);
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/* Releases a shared memory area previously allocated via
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* shared_mem_acquire(). */
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void shared_mem_release(void *ptr);
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#endif /* __CROS_EC_SHARED_MEM_H */
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