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Add the concept of a "user pointer" (similar to the void __user * in

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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).
This commit is contained in:
Michael Brown
2006-05-19 15:06:51 +00:00
parent 0ab92faedb
commit d48d0fb1bb
11 changed files with 154 additions and 54 deletions
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9
src/net/tcp/iscsi.c
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@@ -24,6 +24,7 @@
#include <byteswap.h>
#include <gpxe/scsi.h>
#include <gpxe/process.h>
#include <gpxe/uaccess.h>
#include <gpxe/iscsi.h>
/** @file
@@ -130,7 +131,7 @@ static void iscsi_rx_data_in ( struct iscsi_session *iscsi, void *data,
assert ( iscsi->command != NULL );
assert ( iscsi->command->data_in != NULL );
assert ( ( offset + len ) <= iscsi->command->data_in_len );
memcpy ( ( iscsi->command->data_in + offset ), data, len );
copy_to_user ( iscsi->command->data_in, offset, data, len );
/* Record SCSI status, if present */
if ( data_in->flags & ISCSI_DATA_FLAG_STATUS )
@@ -234,7 +235,11 @@ static void iscsi_tx_data_out ( struct iscsi_session *iscsi ) {
assert ( iscsi->command->data_out != NULL );
assert ( ( offset + len ) <= iscsi->command->data_out_len );
tcp_send ( &iscsi->tcp, iscsi->command->data_out + offset, len );
if ( len > tcp_buflen )
len = tcp_buflen;
copy_from_user ( tcp_buffer, iscsi->command->data_out, offset, len );
tcp_send ( &iscsi->tcp, tcp_buffer, len );
}
/****************************************************************************