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13ad1c007b
This also changes shared_mem to use all the remaining RAM, instead of reserving a fixed-size buffer. Signed-off-by: Randall Spangler <rspangler@chromium.org> BUG=chrome-os-partner:9161 TEST=manual hostevent --> all masks should be 0 hostevent smi 0x12300000 hostevent --> should confirm SMI mask was set sysjump b hostevent --> should confirm SMI mask is still set reboot hostevent --> should confirm SMI mask is back to 0 Change-Id: Iccb6da6ccc93ee5036a3f478d24b717a462d9150
50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
/* Copyright (c) 2012 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 "config.h"
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#include "link_defs.h"
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#include "shared_mem.h"
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#include "system.h"
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static int buf_in_use;
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int shared_mem_size(void)
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{
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/* Use all the RAM we can. The shared memory buffer is the
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* last thing allocated from the start of RAM, so we can use
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* everything up to the jump data at the end of RAM. */
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return system_usable_ram_end() - (uint32_t)__shared_mem_buf;
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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_mem_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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