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[int13] Provide a permanently closed window via the control interface 

Allow objects to support both streaming and block device protocols, by
starting streaming data only when the data transfer window opens.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2011-06-24 19:14:13 +01:00
parent 5eb60f4883
commit 69f5b2e8dc
1 changed files with 15 additions and 0 deletions
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15
src/arch/i386/interface/pcbios/int13.c
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@ -1333,6 +1333,20 @@ static void int13_unhook_vector ( void ) {
&int13_vector );
}
/**
* Check INT13 emulated drive flow control window
*
* @v int13 Emulated drive
*/
static size_t int13_block_window ( struct int13_drive *int13 __unused ) {
/* We are never ready to receive data via this interface.
* This prevents objects that support both block and stream
* interfaces from attempting to send us stream data.
*/
return 0;
}
/**
* Handle INT 13 emulated drive underlying block device closing
*
@ -1357,6 +1371,7 @@ static void int13_block_close ( struct int13_drive *int13, int rc ) {
/** INT 13 drive interface operations */
static struct interface_operation int13_block_op[] = {
INTF_OP ( xfer_window, struct int13_drive *, int13_block_window ),
INTF_OP ( intf_close, struct int13_drive *, int13_block_close ),
};