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
63e85af62f
Fix building of hdd image
2020-04-22 21:44:43 +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
94829aed1e
qemu-hdd: Use hdd image with full partition table
2020-04-21 20:22:32 +02:00
22c1d45e59
Start document on EGA video
2020-04-20 21:41:42 +02:00
13e32675a1
Ship documentation on bios data area
2020-04-20 21:24:29 +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
f7d3d5c62f
Fix addressing mistake when splitting MCB
2020-04-17 23:59:57 +02:00
6d38a313c7
Implement MCB splitting
2020-04-17 23:33:42 +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
1c6268798c
Fix rom builds
2020-04-04 21:04:36 +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
dc5e437c2d
Revert "Remove unused stuff"
...
debug rom still uses printf
This reverts commit a9fa3d355e
2020-04-04 11:41:01 +00:00
a9fa3d355e
Remove unused stuff
2020-04-04 09:27:33 +00:00
91cad67415
Reboot after keypress instead of halting on boot failure
2020-04-03 19:45:49 +00:00
6eca218f8e
Explain the booterr code a bit
2020-04-03 19:43:10 +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
c67894551b
Use directory path for includes, make them use *.asm as extension
2020-03-31 18:43:38 +00:00
73fb2b1e81
Add include file for BPB data
2020-03-31 13:04:13 +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
0b2a7e7b64
fat32 bootloader: implement directory recursing and kernel load
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this is actually working now.
2020-03-30 18:50:17 +00:00
bbe006c9bc
Improve FAT offset calculation
2020-03-30 15:23:51 +00:00
d718777ef6
Mark path to kernel file with +s
...
This is actually a much easier way to find the kernel file than comparing
filenames and helps reducing the size of the bootsector.
2020-03-30 12:35:59 +00:00
955acdacba
Split code up into directories for bs and com binaries
2020-03-30 12:14:47 +00:00
5a24ceb9b8
Implement cluster chaining for FAT
2020-03-28 17:36:52 +00:00
76880e9275
Advance on bootloader: load cluster data
2020-03-25 21:19:40 +00:00
c51dca9949
add kernel stub to distfiles
...
this way i can test if the bootloader works as intended
2020-03-25 20:56:00 +00:00
