June 23, 2010 |
6 >8GB INT 13h Functions
6.1 Overview
The extended INT 13h functions are numbered from 41h through 49h, 4E, and 50h. These functions are different from the conventional INT 13h interface in the following ways:
a)register conventions have been changed to support the passing of data structures;
b)all media addressing information shall be passed via a buffer, not registers; and
c)flags are used to identify optional capabilities.
The caller shall specify a device number in the DL register when calling functions 41h through 48h. This is a logical number that has been assigned to the physical device by system firmware. The physical device addressing information can be retrieved via INT 13h FN 48h. The following registers in
| Table 8 — Extended Function Definitions |
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|
Function | Description |
41h | Check Extensions Present (see 8.14) |
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42h | Extended Read (see 8.15) |
|
|
43h | Extended Write (see 8.16) |
|
|
44h | Verify Sectors (see 8.17) |
|
|
45h | Lock/Unlock Media (see 8.18) |
|
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46h | Eject Removable Media (see 8.19) |
|
|
47h | Obsolete |
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48h | Get Device Parameters (see 8.20) |
|
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49h | Get Extended Media Change Status (see 8.21) |
|
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4Eh | Set Hardware Configuration (see 8.26) |
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50h | Send Packet Command (see 8.27) |
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6.2 Data Structure
The data structure for the INT 13h extensions shall be the device address packet. INT 13h converts addressing information in the device address packet to default parameters appropriate to the media. Table 9 defines the device address packet.
Working Draft Enhanced Disk Drive - 4 | 15 |
