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| author | Michael Brown | 2011-06-24 20:14:13 +0200 |
|---|---|---|
| committer | Michael Brown | 2011-06-28 15:45:13 +0200 |
| commit | 69f5b2e8dc2bd756cc0aac21969b2bf683e94302 (patch) | |
| tree | 4346352810ba8c3baf7971a86d18d724568635af /src | |
| parent | [tls] Eliminate polling while TX state machine is idle (diff) | |
| download | ipxe-69f5b2e8dc2bd756cc0aac21969b2bf683e94302.tar.gz ipxe-69f5b2e8dc2bd756cc0aac21969b2bf683e94302.tar.xz ipxe-69f5b2e8dc2bd756cc0aac21969b2bf683e94302.zip | |
[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>
Diffstat (limited to 'src')
| -rw-r--r-- | src/arch/i386/interface/pcbios/int13.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/arch/i386/interface/pcbios/int13.c b/src/arch/i386/interface/pcbios/int13.c index b099958c..8ce77ada 100644 --- a/src/arch/i386/interface/pcbios/int13.c +++ b/src/arch/i386/interface/pcbios/int13.c @@ -1334,6 +1334,20 @@ static void int13_unhook_vector ( void ) { } /** + * 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 * * @v int13 Emulated drive @@ -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 ), }; |