adf67d9723
Rework fat boot sector, load FAT only once instead of partial
2020-09-23 23:01:50 +00:00
31eac279c2
Revert to more sensible kernel.bs boot scheme
...
I think i should consider it a necessity that the kernel is accessible
as a regular file. This makes installing rdos on another blockdev
much easier.
2020-09-20 19:58:19 +02:00
8ed9fe7465
Fix hdd booting using bpb struc
2020-09-19 08:22:50 +00:00
1d64c2364d
Improve build transparency (documentation and inline version number)
2020-09-17 08:59:22 +00:00
8e87cf0f75
Load kernel from reserved sectors in fatfs
2020-09-17 05:57:46 +00:00
9cd4c04c42
Make kernel and fat.bs use BPB struct
2020-09-15 21:45:29 +02:00
303b1756e0
Fuck up the kernel, i have other ideas now
2020-09-15 21:44:32 +02:00
352540bd25
kernel: First steps of calculating drive tab data from BPB
2020-08-31 20:11:05 +00:00
cc3fe6c4ee
kernel: fix banner printing
2020-08-27 21:01:41 +00:00
f0a000b7d1
kernel: implement diskio using drive table
2020-08-27 20:52:16 +00:00
fde87d651c
kernel: read A: geometry from BIOS
2020-08-15 21:15:31 +00:00
626b7e5624
Add struc for disk parameter table
2020-08-15 18:30:17 +00:00
5382edc2ae
Improve ordering of binary data in kernel
2020-07-04 10:35:38 +02:00
f9b180ea57
Implement file descriptor table and CON as file descriptor
2020-06-28 19:01:14 +02:00
1b42f1a480
Implement calculation for FAT position
2020-05-10 16:47:48 +00:00
36f4673c91
Another attempt on disk i/o
2020-05-02 23:57:23 +02:00
404825387b
mbr: make use of BPB includes
2020-04-30 20:22:14 +02:00
b73bfbe043
Split out kernel components in kernel/
2020-04-27 15:56:41 +02:00
2d949a01f8
Implement whacky first version for 25h disk read
2020-04-26 23:14:34 +02:00
43e5cd6379
Direct console input: Dont return non-ascii keypresses
2020-04-25 21:54:15 +02:00
da41f6b0e2
Rework early startup and fix bss memory reservation
2020-04-23 21:49:10 +02:00
4804bf28ea
Place variables into area after binary
2020-04-23 21:36:20 +02:00
3619a20703
Implement some console i/o
2020-04-23 21:35:28 +02:00
035b69db10
fat.bs: Implement correctly for FAT12
2020-04-22 21:45:40 +02:00
34ef468aa9
fat.bs: Smaller BPB size when not FAT32
2020-04-22 21:45:06 +02:00
abc7b563cd
Revamp MBR
...
New features:
- ES:DI (potential PnP structure) is preserved
- FAT detection now works by checking for BPB values
- Uses booterr procedure
2020-04-21 23:27:00 +02:00
bbfcd42f61
Set up interrupt table at startup directly (less code), not calling setint
2020-04-21 20:22:42 +02:00
f8788720f5
Implement int 28h: Idle callout
2020-04-20 19:21:02 +02:00
40065266f3
Implement int 29h: Fast console output
2020-04-20 19:20:43 +02:00
c5088789f9
Proof kernel against being invoked via 0x7C0:0
2020-04-19 15:14:10 +02:00
97f26c1f89
Remove stack switching, implement some syscalls
2020-04-19 00:35:31 +02:00
c1c012c5fc
Make getint and setint reuse cs segment
2020-04-18 23:44:16 +02:00
4a92c4bc1e
Drop MCBs as mean to manage memory
2020-04-18 22:59:46 +02:00
6c165f40c0
Create basic MCB at boot
2020-04-17 01:24:23 +02:00
70a675442a
Reorder disk access and fix missing si setting
2020-04-16 23:04:06 +02:00
27e4dec580
Implement loading BPB from media
2020-04-15 23:51:07 +02:00
23ddd6b41a
Implement some PoC of reading from disk
2020-04-15 00:17:58 +02:00
6b49a20865
Implement syscall subfunction jump table
2020-04-13 18:03:54 +02:00
39ef1f9a3e
Implement some syscall handling
2020-04-13 13:53:21 +00:00
6ba3e0c071
Implement stack switching for dos syscall entry point
2020-04-10 15:00:26 +00:00
f46871502c
Pave way for supporting FAT16 and FAT12
2020-04-06 19:20:15 +00:00
e34accfcff
Improve support for auto-selecting LBA addressing
2020-04-04 21:05:44 +00:00
3b438074ef
Reorder fat32 bootsector to reduce number of calls/rets
2020-04-04 16:03:02 +00:00
1e99086fc6
Add CHS+LBA dual support for boot sector
2020-04-04 14:29:33 +00:00
3da473a00c
Use optimized error handling for boot sector
2020-04-03 17:38:33 +00:00
cb48e628db
kernel stub: force large size to make sure cluster chaining works
2020-04-01 13:09:01 +00:00
1981a8efba
fat32 bs: use BPB include header and base off BP
...
We now set BP once at the start to point to the beginning of the BPB.
Encoding an direct address access can then be done relative to BP, which
saves an immediate byte per access.
2020-03-31 20:03:05 +00:00
9044e3948c
Remove BASE macro and companions
2020-03-31 19:46:59 +00:00
eabb1d9fa9
Properly set up registers when chainloading from boot sector
2020-03-30 20:41:32 +00:00
bc096f41d3
Compact bootloader code
2020-03-30 19:43:07 +00:00
