scratchring.h

这是一个intel网络处理器ixp24xx系列中微码例子。用汇编写的。可以参考一下。

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#ifndef EXAMPLE_SCRATCH_RING_H
#define EXAMPLE_SCRATCH_RING_H

// Ring size [31:30]. Hardware representation
// 00 = 128
// 01 = 256
// 10 = 512
// 11 = 1024

#define RING_SIZE_128 		0
#define RING_SIZE_256		1
#define RING_SIZE_512		2
#define RING_SIZE_1024		3


// Valid values for RING_SIZE are 128, 256, 512 or 1024.

#define 		RING_SIZE			128

// Base Address for Scratch Ring is 0x1000. Should be aligned on a 4 x RING_SIZE byte boundary.

#define 		RING_BASE			0x1000


// Ring number to use. 0-15.

#define 		RING_NUMBER			0

// Eventhough 0-15 rings are possible, the "ring full"input state can be used
// only on rings 0-11. i.e SCR_Ring#_Full is valid only for # = 0-11.

#ifdef 	RING_NUMBER

#if (RING_NUMBER > 11)
#error			"For Ring Number Greater than 11, we cannot use the SCR_Ring#_Full input state. Check RING_NUMBER"
#else
#define_eval	RING_FULL			SCR_Ring/**/RING_NUMBER/**/_Full	
#endif

#endif	// RING_NUMBER



// Symbolic name for signal 1. 
// Once we have the automatic signal allocator, this can be removed

// SIG_WAKE_CONS is used to signal the consumer that the ring full of items to consume.

#define SIG_WAKE_CONS		1

// SIG_WAKE_PROD is used to signal the producer that the ring is empty, so producer can start 
// producing

#define SIG_WAKE_PROD		2

#endif //EXAMPLE_SCRATCH_RING_H