| /* |
| * Copyright 2012, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials provided |
| * with the distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| * locks.h: locks are used to preserve atomicity of operations in mosys. |
| * This is useful if multiple instances of mosys might be used at once, |
| * such as if a monitoring daemon links to it and a userspace app is present. |
| */ |
| |
| #ifndef MOSYS_LOCKS_H__ |
| #define MOSYS_LOCKS_H__ |
| |
| /* this is the base key, since we have to pick something global */ |
| #define MOSYS_IPC_LOCK_KEY (0x67736c00 & 0xfffffc00) /* 22 bits "gsl" */ |
| |
| /* The ordering of the following keys matters a lot. We don't want to reorder |
| * keys and have a new mosys or binary dependent on deployed/used |
| * because it will break the atomicity of existing mosys users and binaries. In |
| * other words, DO NOT REORDER. */ |
| |
| /* this is the mosys "big lock". */ |
| #define MOSYS_LOCK_BIGLOCK (MOSYS_IPC_LOCK_KEY + 0) |
| |
| /* for Google EC */ |
| #define CROS_EC_LOCK (MOSYS_IPC_LOCK_KEY + 1) |
| |
| /* key for testing, should never be used in production */ |
| #define MOSYS_TEST_KEY 0xffffffff |
| |
| #endif /* MOSYS_LOCKS_H__ */ |
| |
