/* *  linux/drivers/acorn/scsi/scsi.h * *  Copyright (C) 2002 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * *  Commonly used scsi driver functions. */#define BELT_AND_BRACES/* * The scatter-gather list handling.  This contains all * the yucky stuff that needs to be fixed properly. */static inline int copy_SCp_to_sg(struct scatterlist *sg, Scsi_Pointer *SCp, int max){	int bufs = SCp->buffers_residual;	BUG_ON(bufs + 1 > max);	sg->page   = virt_to_page(SCp->ptr);	sg->offset = offset_in_page(SCp->ptr);	sg->length = SCp->this_residual;	if (bufs)		memcpy(sg + 1, SCp->buffer + 1,		       sizeof(struct scatterlist) * bufs);	return bufs + 1;}static inline int next_SCp(Scsi_Pointer *SCp){	int ret = SCp->buffers_residual;	if (ret) {		SCp->buffer++;		SCp->buffers_residual--;		SCp->ptr = (char *)			 (page_address(SCp->buffer->page) +			  SCp->buffer->offset);		SCp->this_residual = SCp->buffer->length;	} else {		SCp->ptr = NULL;		SCp->this_residual = 0;	}	return ret;}static inline unsigned char get_next_SCp_byte(Scsi_Pointer *SCp){	char c = *SCp->ptr;	SCp->ptr += 1;	SCp->this_residual -= 1;	return c;}static inline void put_next_SCp_byte(Scsi_Pointer *SCp, unsigned char c){	*SCp->ptr = c;	SCp->ptr += 1;	SCp->this_residual -= 1;}static inline void init_SCp(Scsi_Cmnd *SCpnt){	memset(&SCpnt->SCp, 0, sizeof(struct scsi_pointer));	if (SCpnt->use_sg) {		unsigned long len = 0;		int buf;		SCpnt->SCp.buffer = (struct scatterlist *) SCpnt->buffer;		SCpnt->SCp.buffers_residual = SCpnt->use_sg - 1;		SCpnt->SCp.ptr = (char *)			 (page_address(SCpnt->SCp.buffer->page) +			  SCpnt->SCp.buffer->offset);		SCpnt->SCp.this_residual = SCpnt->SCp.buffer->length;#ifdef BELT_AND_BRACES		/*		 * Calculate correct buffer length.  Some commands		 * come in with the wrong request_bufflen.		 */		for (buf = 0; buf <= SCpnt->SCp.buffers_residual; buf++)			len += SCpnt->SCp.buffer[buf].length;		if (SCpnt->request_bufflen != len)			printk(KERN_WARNING "scsi%d.%c: bad request buffer "			       "length %d, should be %ld\n", SCpnt->device->host->host_no,			       '0' + SCpnt->device->id, SCpnt->request_bufflen, len);		SCpnt->request_bufflen = len;#endif	} else {		SCpnt->SCp.ptr = (unsigned char *)SCpnt->request_buffer;		SCpnt->SCp.this_residual = SCpnt->request_bufflen;	}	/*	 * If the upper SCSI layers pass a buffer, but zero length,	 * we aren't interested in the buffer pointer.	 */	if (SCpnt->SCp.this_residual == 0 && SCpnt->SCp.ptr) {#if 0 //def BELT_AND_BRACES		printk(KERN_WARNING "scsi%d.%c: zero length buffer passed for "		       "command ", SCpnt->host->host_no, '0' + SCpnt->target);		print_command(SCpnt->cmnd);#endif		SCpnt->SCp.ptr = NULL;	}}