blob: f7b8bcbccbfed3e827af92bc8ff51bd5b4e60a59 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/*
* Shared memory interface for Chrome EC.
*
* This is intended to supply a relatively large block of memory for use by a
* task for a relatively short amount of time. For example, verified boot may
* need a buffer to hold signature data during a verification operation. It is
* NOT intended for allocating long-term buffers; those should in general be
* static variables allocated at compile-time. It is NOT a full-featured
* replacement for malloc() / free().
*/
#ifndef __CROS_EC_SHARED_MEM_H
#define __CROS_EC_SHARED_MEM_H
#include "common.h"
/**
* Initializes the module.
*/
int shared_mem_init(void);
/**
* Returns the maximum amount of shared memory which can be acquired, in
* bytes.
*/
int shared_mem_size(void);
/**
* Acquires a shared memory area of the requested size in bytes.
*
* @param size Number of bytes requested
* @param dest_ptr If successful, set on return to the start of the
* granted memory buffer.
*
* @return EC_SUCCESS if successful, EC_ERROR_BUSY if buffer in use, or
* other non-zero error code.
*/
int shared_mem_acquire(int size, char **dest_ptr);
/**
* Releases a shared memory area previously allocated via shared_mem_acquire().
*/
void shared_mem_release(void *ptr);
#endif /* __CROS_EC_SHARED_MEM_H */
|
