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Added new HBIOS Function SYSGET_DIOMED

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Mark Pruden
2024-10-06 12:33:29 +11:00
parent fb9f9774d7
commit 497e5333c4
13 changed files with 928 additions and 638 deletions
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38
Source/Doc/SystemGuide.md
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@@ -1076,8 +1076,10 @@ there is no media in device, function will return an error status.
**NOTE**: This function will always return MID_HD512 for hard disk
devices. MID_HD1K is provided for use internally by operating systems
that provide different filsystem formats depending on the partition
table. This function cannot be used to determine if an HD1K formatted
partition exists on the hard disk.
table. To determine if an HD1K formatted partition exists on the hard disk
please see the following function.
[SYSGET Subfunction 0x12 -- Get Extended Disk Media (DIOMED)]
### Function 0x19 -- Disk Define Media (DIODEFMED)
@@ -2459,6 +2461,36 @@ the caller can use interbank calls directly to the function in the
driver which bypasses the overhead of the normal function invocation
lookup.
#### SYSGET Subfunction 0x12 -- Get Extended Disk Media (DIOMED)
| **Entry Parameters** | **Returned Values** |
|----------------------------------------|---------------------------------------|
| B: 0xF8 | A: Status |
| C: 0x12 | C: Media ID |
| D: Disk Unit | DEHL: Sector Address |
| E: Slice | |
Report the Media ID (C) for the for media in the specified Disk Unit (D),
and for hard disks the absolute Sector offset to the start of the Slice (E).
The Status (A) is a standard HBIOS result code.
This function extends upon [Function 0x18 -- Disk Media (DIOMEDIA)] for hard
disk media by scanning for a partition to determine if the disk uses HD512
or HD1K, correctly reporting MID_HD or MID_HDNEW respectively.
It will also return the sector number of the first sector in the
slice if the slice number is valid. If the slice number is invalid
(it wont fix on the media) an error will be returned.
The slice calculation is performed by considering the partition start
(if it exists), the size of a slice for the given format type, and ensuring
that the slice fits within the media or partition size, taking into
consideration other partitions that may exist.
If the Unit specified is not a hard disk the Media ID will be returned and
the slice parameter ignored. If there is no media in device, or the slice
number is invaid (Parameter Out Of Range) the function will return an error status.
#### SYSGET Subfunction 0x20 -- Get RTC Device Unit Count (RTCCNT)
| **Entry Parameters** | **Returned Values** |
@@ -3211,7 +3243,7 @@ The following section outlines the read only data referenced by the
| CMDREG | 5 | 1 | IO PORT ADDRESS FOR MODE 1 |
| | | | _Below are the register mirror values_ |
| | | | _that HBIOS used for initialisation_ |
| REG. 0 | 6 | 1 | $00 - NO EXTERNAL VID
| REG. 0 | 6 | 1 | $00 - NO EXTERNAL VID |
| REG. 1 | 7 | 1 | $50 or $70 - SET MODE 1 and interrupt if enabled |
| REG. 2 | 8 | 1 | $00 - PATTERN NAME TABLE := 0 |
| REG. 3 | 9 | 1 | $00 - NO COLOR TABLE |