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https://github.com/Telecominfraproject/OpenCellular.git
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371d06bbfd
Adds shmem command to print amount of shared memory. This is also a useful indicator of how much IRAM is left, since shared memory will expand to fill all unused IRAM. Removes never-implemented wait param to shared_mem_acquire(). BUG=none TEST=shmem Change-Id: I798ff644d701dcba52219b70bec99c06a23d03ec Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/29809 Reviewed-by: Bill Richardson <wfrichar@chromium.org>
51 lines
1.4 KiB
C
51 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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/*
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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 use by a
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* task for a relatively short amount of time. For example, verified boot may
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* need a buffer to hold signature data during a verification operation. It is
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* NOT intended for allocating long-term buffers; those should in general be
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* static variables allocated at compile-time. It is NOT a full-featured
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* replacement for malloc() / free().
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*/
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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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/**
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* Initializes the module.
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*/
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int shared_mem_init(void);
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/**
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* Returns the maximum amount of shared memory which can be acquired, in
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* bytes.
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*/
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int shared_mem_size(void);
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/**
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* Acquires a shared memory area of the requested size in bytes.
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*
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* @param size Number of bytes requested
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* @param dest_ptr If successful, set on return to the start of the
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* granted memory buffer.
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*
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* @return EC_SUCCESS if successful, EC_ERROR_BUSY if buffer in use, or
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* other non-zero error code.
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*/
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int shared_mem_acquire(int size, char **dest_ptr);
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/**
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* Releases a shared memory area previously allocated via shared_mem_acquire().
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*/
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void shared_mem_release(void *ptr);
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#endif /* __CROS_EC_SHARED_MEM_H */
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