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Improve OS Boot Drive Assignment

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- Modified the Disk Device function call (DIODEVICE) to provide new attributes related to disk size and removability.
- Leveraged API change to allow handling drive assignment differently depending on ATAPI vs. ATA interface.
This commit is contained in:
Wayne Warthen
2023-06-20 15:52:34 -07:00
parent 8f5cc510ee
commit 5457a7e7fd
31 changed files with 233 additions and 152 deletions
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Source/Doc/SystemGuide.md
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@@ -757,28 +757,36 @@ of memory because it avoids a double copy.
Reports device information about the specified Disk Unit (C). The
Status (A) is a standard HBIOS result code.
Bit 7 of the Device Attribute (C) value returned indicates whether the
device is a floppy disk. If it is a floppy disk, the Device Attribute
(C) value is encoded as follows:
The Device Attribute (C) value returned indicates various
feature indicators related to the device being referenced
by the specified Disk Unit (C). The high 3 bits apply to
all devices. The definition of the low 5 bits depends on
whether the device is a Floppy (indicated by bit 5).
The common bits are:
| **Bits** | **Definition** |
|---------:|--------------------------------------------------|
| 7 | = 1 (Floppy Disk) |
| 6-5 | Form Factor: 0=8", 1=5.25", 2=3.5", 3=Other |
| 4 | Sides: 0=SS, 1=DS |
| 3-2 | Density: 0=SD, 1=DD, 2=HD, 3=ED |
| 1-0 | Reserved |
If the Disk Unit (C) specified is a not floppy disk, then the Device
Attribute (C) encoding is as follows:
| **Bits** | **Definition** |
|---------:|--------------------------------------------------|
| 7 | = 0 (not Floppy Disk) |
| 7 | Floppy |
| 6 | Removable |
| 5-3 | Type: 0=Hard, 1=CF, 2=SD, 3=USB, |
| | 4=ROM, 5=RAM, 6=RAMF, 7=FLASH |
| 2-0 | Reserved |
| 5 | High Capacity (>8 MB) |
The Floppy specific bits are:
| **Bits** | **Definition** |
|---------:|--------------------------------------------------|
| 4-3 | Form Factor: 0=8", 1=5.25", 2=3.5", 3=Other |
| 2 | Sides: 0=SS, 1=DS |
| 1-0 | Density: 0=SD, 1=DD, 2=HD, 3=ED |
The non-Floppy specific bits are:
| **Bits** | **Definition** |
|---------:|--------------------------------------------------|
| 4 | LBA Capable |
| 3-0 | Media Type: 0=Hard Disk, 1=CF, 2=SD, 3=USB, |
| | 4=ROM, 5=RAM, 6=RAMF, 7=FLASH, 8=CD-ROM, |
| | 9=Cartridge |
Device Type (D) indicates the specific hardware driver that handles the
specified Disk Unit (C). Values are listed at the start of this