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Diffstat (limited to 'cpu/ixp/npe/include/IxEthDBLocks_p.h')
| -rw-r--r-- | cpu/ixp/npe/include/IxEthDBLocks_p.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/cpu/ixp/npe/include/IxEthDBLocks_p.h b/cpu/ixp/npe/include/IxEthDBLocks_p.h new file mode 100644 index 0000000000..1d8b24fdf6 --- /dev/null +++ b/cpu/ixp/npe/include/IxEthDBLocks_p.h @@ -0,0 +1,122 @@ +/** + * @file IxEthAccDBLocks_p.h + * + * @brief Definition of transaction lock stacks and lock utility macros + * + * @par + * IXP400 SW Release version 2.0 + * + * -- Copyright Notice -- + * + * @par + * Copyright 2001-2005, Intel Corporation. + * All rights reserved. + * + * @par + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. 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. + * 3. Neither the name of the Intel Corporation nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * @par + * 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. + * + * @par + * -- End of Copyright Notice -- + */ + +#ifndef IxEthAccDBLocks_p_H +#define IxEthAccDBLocks_p_H + +#include "IxOsPrintf.h" + +/* Lock and lock stacks */ +typedef struct +{ + IxOsalFastMutex* locks[MAX_LOCKS]; + UINT32 stackPointer, basePointer; +} LockStack; + +#define TRY_LOCK(mutex) \ + { \ + if (ixOsalFastMutexTryLock(mutex) != IX_SUCCESS) \ + { \ + return IX_ETH_DB_BUSY; \ + } \ + } + + +#define UNLOCK(mutex) { ixOsalFastMutexUnlock(mutex); } + +#define INIT_STACK(stack) \ + { \ + (stack)->basePointer = 0; \ + (stack)->stackPointer = 0; \ + } + +#define PUSH_LOCK(stack, lock) \ + { \ + if ((stack)->stackPointer == MAX_LOCKS) \ + { \ + ERROR_LOG("Ethernet DB: maximum number of elements in a lock stack has been exceeded on push, heavy chaining?\n"); \ + UNROLL_STACK(stack); \ + \ + return IX_ETH_DB_NOMEM; \ + } \ + \ + if (ixOsalFastMutexTryLock(lock) == IX_SUCCESS) \ + { \ + (stack)->locks[(stack)->stackPointer++] = (lock); \ + } \ + else \ + { \ + UNROLL_STACK(stack); \ + \ + return IX_ETH_DB_BUSY; \ + } \ + } + +#define POP_LOCK(stack) \ + { \ + ixOsalFastMutexUnlock((stack)->locks[--(stack)->stackPointer]); \ + } + +#define UNROLL_STACK(stack) \ + { \ + while ((stack)->stackPointer > (stack)->basePointer) \ + { \ + POP_LOCK(stack); \ + } \ + } + +#define SHIFT_STACK(stack) \ + { \ + if ((stack)->basePointer == MAX_LOCKS - 1) \ + { \ + ERROR_LOG("Ethernet DB: maximum number of elements in a lock stack has been exceeded on shift, heavy chaining?\n"); \ + UNROLL_STACK(stack); \ + \ + return IX_ETH_DB_BUSY; \ + } \ + \ + ixOsalFastMutexUnlock((stack)->locks[(stack)->basePointer++]); \ + } + +#endif /* IxEthAccDBLocks_p_H */ |