d48d0fb1bb
the kernel), which encapsulates the information needed to refer to an external buffer. Under normal operation, this can just be a void * equivalent, but under -DKEEP_IT_REAL it would be a segoff_t equivalent. Use this concept to avoid the need for bounce buffers in int13.c, which reduces memory usage and opens up the possibility of using multi-sector reads. Extend the block-device API and the SCSI block device implementation to support multi-sector reads. Update iscsi.c to use user buffers. Move the obsolete portions of realmode.h to old_realmode.h. MS-DOS now boots an order of magnitude faster over iSCSI (~10 seconds from power-up to C:> prompt in bochs).
44 lines
837 B
C
44 lines
837 B
C
#ifndef _GPXE_BLOCKDEV_H
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#define _GPXE_BLOCKDEV_H
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/**
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* @file
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*
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* Block devices
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*
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*/
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#include <gpxe/uaccess.h>
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/** A block device */
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struct block_device {
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/** Block size */
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size_t blksize;
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/** Total number of blocks */
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uint64_t blocks;
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/**
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* Read block
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*
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* @v blockdev Block device
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* @v block Block number
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* @v count Block count
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* @v buffer Data buffer
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* @ret rc Return status code
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*/
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int ( * read ) ( struct block_device *blockdev, uint64_t block,
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unsigned long count, userptr_t buffer );
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/**
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* Write block
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*
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* @v blockdev Block device
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* @v block Block number
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* @v count Block count
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* @v buffer Data buffer
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* @ret rc Return status code
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*/
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int ( * write ) ( struct block_device *blockdev, uint64_t block,
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unsigned long count, userptr_t buffer );
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};
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#endif /* _GPXE_BLOCKDEV_H */
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