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
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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
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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
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
955acdacba
Split code up into directories for bs and com binaries
2020-03-30 12:14:47 +00:00
bc238a3bf9
i still dont know what im doing
2020-03-01 16:45:16 +00:00
4847eb4d88
Revert "Throw out previous x86 stuff"
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This reverts commit 807db4a592
2020-03-01 12:03:35 +00:00
807db4a592
Throw out previous x86 stuff
2019-12-22 02:52:40 +01:00
eb67071ffb
Ubuntu needs stdint.h for uint8_t
2019-11-24 11:28:39 +00:00
af61db5e40
Improve memory position handling
2019-10-28 10:49:42 +00:00
47630b2c03
Implement boot based on reserved sectors
2019-10-28 10:38:18 +00:00
f81de2bfe8
Rename kernel to bdos
2019-10-27 18:59:42 +00:00
f6b8df0598
Remove misplaced data
2019-10-12 15:10:19 +00:00
d1dab01633
Rename rdos.sys to rdos.bin
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*.sys is meant for DOS-like driver binaries. I actually have a flat
binary with a specific load offset.
2019-09-29 21:26:59 +00:00
56f9df5773
Throw DOS api away, re-layout memory to fit CP/M model
2019-09-29 08:52:00 +00:00
80a7b03ddc
Provide config file via CX (len) and BX (ptr) to kernel entry
2019-09-24 21:33:04 +00:00
a4e6a943b0
Make bootloader load both kernel and kernel config
2019-09-24 21:14:29 +00:00
cd7aafde09
Run kernel with from offset 0
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I try to get the interrupt handlers into a offset as low as possible.
This is necessity if i want to relocate it later on its own.
For running from HMA, a minimal offset of 16 bytes would still be
necessary.
2019-09-23 22:06:29 +00:00
df4d3a90e3
Use SYS extension for kernel
2019-09-23 22:05:01 +00:00
0b7d141af7
Add warning about mformat overwriting bootsector code
2019-09-23 21:19:12 +00:00
705cd5c725
Remove command line parsing from bootloader
2019-09-23 20:25:39 +00:00
54149839a3
Rename fatvbr -> fat, generalize makefile
2019-09-21 18:05:41 +00:00
c70f388548
Get MBR ready, add hdimage target
2019-09-17 22:41:39 +00:00
7c4a618385
Add first attempt of a MBR
2019-09-17 21:53:10 +00:00
da03aa1481
Relocate boot sector to 0x600
2019-09-16 12:05:15 +00:00
