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bdf7da5b08
source files mainly done by Randall. Signed-off-by: Randall Spangler <rspangler@chromium.org> Change-Id: Iaff83a842b17f3350fb6f2a3f1597ad4c29bd12a
55 lines
1.1 KiB
C
55 lines
1.1 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 module for Chrome EC */
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#include "shared_mem.h"
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#include "uart.h"
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/* Size of shared memory buffer */
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#define SHARED_MEM_SIZE 4096
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static char shared_buf[SHARED_MEM_SIZE];
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static int buf_in_use = 0;
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int shared_mem_init(void)
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{
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return EC_SUCCESS;
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}
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int shared_mem_size(void)
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{
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return SHARED_MEM_SIZE;
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}
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int shared_mem_acquire(int size, int wait, char **dest_ptr)
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{
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if (size > SHARED_MEM_SIZE || size <= 0)
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return EC_ERROR_INVAL;
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/* TODO: if task_start() hasn't been called, fail immediately
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* if not available. */
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/* TODO: wait if requested; for now, we fail immediately if
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* not available. */
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if (buf_in_use)
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return EC_ERROR_BUSY;
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/* TODO: atomically acquire buf_in_use. */
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buf_in_use = 1;
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*dest_ptr = shared_buf;
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return EC_SUCCESS;
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}
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void shared_mem_release(void *ptr)
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{
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/* TODO: use event to wake up a previously-blocking acquire */
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buf_in_use = 0;
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}
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