fat32_sys_rewrite as of 22/8/2025 #5

nivirx · 2025-08-22T11:51:16-04:00

nivirx commented

2025-08-22 11:51:16 -04:00

Key changes

** Stevia is now GPLv3 again, I'm the only contributor so the board said it was ok to re-license 🤣 **

.gitignore – ignores developer environment artifacts.
include/cdecl16.inc – expanded macro set for function prolog/epilog and fastcall variants.
include/BIOS/func/ext_read.nasm – revised extended‑read wrapper; now uses a macro for easy invocation and clears the LBA packet with kmemset.
include/error_codes.inc – new codes for FAT32 and stage‑2 errors.
include/util/kmem_func.nasm – streamlined kmemset/kmemcpy.
Major FAT32 subsystem refactor:
- include/fat32/fat32_structures.inc – field names normalized to spec and structured for relative addressing.
- include/fat32/FAT32_SYS.inc – InitFATDriver rewritten with error‑flag checks, state struct handled via di; new FSInfoPrinter stub and rewritten SearchFATDIR.
src/stage2/stage2.nasm – updated to use new info strings and macro names; hooks into refactored FAT32 routines.
src/vbr/vbr.nasm – minor adjustments for the revised includes.
scripts/create-disk.sh – small cleanup in disk-image creation.

These changes collectively modernize calling conventions, improve FAT32 handling, and streamline build scripts compared to the trunk branch.

# Key changes ** Stevia is now GPLv3 again, I'm the only contributor so the board said it was ok to re-license 🤣 ** - .gitignore – ignores developer environment artifacts. - include/cdecl16.inc – expanded macro set for function prolog/epilog and fastcall variants. - include/BIOS/func/ext_read.nasm – revised extended‑read wrapper; now uses a macro for easy invocation and clears the LBA packet with kmemset. - include/error_codes.inc – new codes for FAT32 and stage‑2 errors. - include/util/kmem_func.nasm – streamlined kmemset/kmemcpy. - Major FAT32 subsystem refactor: - include/fat32/fat32_structures.inc – field names normalized to spec and structured for relative addressing. - include/fat32/FAT32_SYS.inc – InitFATDriver rewritten with error‑flag checks, state struct handled via di; new FSInfoPrinter stub and rewritten SearchFATDIR. - src/stage2/stage2.nasm – updated to use new info strings and macro names; hooks into refactored FAT32 routines. - src/vbr/vbr.nasm – minor adjustments for the revised includes. - scripts/create-disk.sh – small cleanup in disk-image creation. These changes collectively modernize calling conventions, improve FAT32 handling, and streamline build scripts compared to the trunk branch.

nivirx added 180 commits 2025-08-22 11:51:17 -04:00

Create LICENSE.md 967a13de7e

Merge pull request #1 from Xinnx/add-license-1 4a37274e58

Create LICENSE.md

Create README.md e78074e190

Delete COPYING 1a1b7a279d

Removing GPL-3.0 license.

Update README.md ad192db2a6

small changes to License 91ec2ad898

🏳️‍⚧️

remove packaged binaries df8c959bb4

use wx interface for config, gui, and debug bb6d943047

MIT license applied to all project files d7bd565279

update readme with more information 0868cf41cc

Update README.md bd1492593b

added description for create-disk script 4b0e0abd9b

clarify that WSL is supported 333b176793

updated gitignore 7b3ed7e1de

enable logging and bump to 128MB of memory bd47648ad0

changed extention from .s to .nasm 9cb9a6664f

Update README.md dafac41102

updated description to more accurately reflect project status

remove reallocation in mbr init ee65b6acc5

also reenable interupts in the init block

ignore vscode personal configs 2a1b0f3b09

added -P option to losetup e859f5da13

this fixes an issue that appeared on WSL2 recently(ish)

partially revert change, sti is still in init 20c18ac4ec

added debuging 'errors' 60a10e41e0

also there is special handling for them in error.inc

small optimization to error printer 8a3b12774f

saves us 5 bytes of code (15 overall)

added bxrc config to launch on windows hosts d813b03de9

removed ata1 from windows bochsrc b654e900ed

added some clarification on cdecl16 e057dbdbe3

moved reservation for bpb to a include f3de54fa9d

load our base headers in the same order as the mbr cbd7244e87

remove comment about CC, see docs/ 18bb9a5691

fixing how the stack works stage1 😳 a6835df63e

bunch of changes mostly to do with cdecl16 conformity 3804f1c4be

moved top of stack marker to init
SetTextMode and Cursor done before hello msg
corrected CC/Stack usage to conform with cdecl16 for PrintString
corrected CC/Stack usage to conform with cdecl16 for PrintChar
corrected stack usage to conform with cdecl16 for SetTextMode
corrected stack usage to conform with cdecl16 for disable_cursor

added entry & exit macros 0c36f9f1fd

replace prologs and epilogs in cdecl functions so far a3af2a5825

cdecl16 for EnableA20 ver.1 9080533175

src/stage2/stage2.nasm:573: warning: label alone on a line without a colon might be in error [-w+label-orphan] 94ed76be82

cdecl16 work and cleanup in MemoryMap d2194ab835

some general cleanup & moving the halt to the next point in main() 768260540f

refactored and validated MemoryMap funciton 269e90a122

cdecl16 update for EnterUnrealMode 09366afbdf

move E820 function desc to memory.inc 3f72d5ad31

swap order of entering Unreal mode and getting an E820 7fbb9b13e2

also InitFATDriver should be ok to add to the start process again.

rough pass on fixing the stack across the board e03322b129

update some of the dword stack macros 91c37df3d0

forking kmemset functions to be updated later for mbr/vbr 51d77eda6f

forking kmemset functions for stage2 usage f8585889f1

add forked functions and remove from memory.inc for kmem* 339216f6a2

remove this and add it back to vbr.nasm d16323bac1

add bpb and ebpb reserve area back to vbr.nasm 60ad0d71e0

change FAT partition type to 0Ch from 0Bh (W95 FAT32 LBA was CHS/LBA) e3f0d34336

added isoz stage to make a compressed disk image 4e7a9e00d7

also included a work around for a WSL bug in create-disk.sh

add macros to prevent __CDECL16 stuff from being defined multiple times d0635f4f3a

seperate error code for reading disk in mbr vs vbr vs stage2 abd8cba080

kmemset and kmemcpy cdecl16 versions 438b784f2d

cdecl16 overhaul for mbr code a6a774484f

switch to cdecl kmem* functions
refactored read_disk_raw to read_vbr_raw
fixed a small issue where the mbr wasn't checking its signature

move cdecl macros to nearly the top so early functions can use them e45f1cb27d

vbr cdecl overhaul ecd858f030

refactored read_disk_raw to read_stage2_raw
switched to new kmem functions

remove old kmem functions c1c6b25e6e

some bpb/ebpb tweaks db1d0295c5

increased disk size and moved bpb/ebpb a bit aae0d6b5b3

change test kernel stage name 6b2b1d2fc9

also pointed up a bug in memory.inc

remove the dword stack macros and just use the 32bit override a0df1cb100

removed extra part probe and added sleep before removing disk bcb9fc2176

also back to putting the test 32bit mode code on the root of the volume

Move fat32 and BIOS functions to their own files 867232890e

typo fix 64f2453d61

more modularization and updating date in MIT licence header 446dd451be

tons more work on modularizing the code f5f5a330cd

fixed read_disk_raw in ReadFATCluster 4c4c3b0e27

boot_drive and partition_offset are global pointers now
removed an extra error from mbr disk read
and some general formating and cleanup 😅

Merge pull request #2 from Nivirx/FAT_Refactor 7e0cd2a931

Full refactor for modularization

make the Linux bochs run more inline with the Windows one 39e977ea2c

surpress some of the relocation warnings for mbr, vbr & stage2 3c40190f23

cutting out everything from miniboot aac964c378

this file has always just been a place holder to get some code to load from the disk
I wanted to cut out all the extra stuff in it just to simplify things down.

jmp imm32 vs jmp rel8 (5 bytes vs 2 bytes) db45a5cf8b

force the first jump to init in all stages to be the rel8 version ca195e6048

renamed files to show code vs defs 8e05e071e8

files that actually include code should be in .nasm files
defines/macros/non-code should be in .inc files

converted error handler to a 16bit far jump 09d33086a0

optimized the early error printer a bit to save some bytes
removed DEBUG_HCF macro

ensure 2 byte jmp rel8 thunk to init 6643e3c990

surpress reloc abs warnings
corrected include paths/filenames

Update README.md 61f27cabd7

unreal gdt now has 2 selectors 1 code, 1 data 13ff42a7d1

ss, and e/f/g segments are loaded to the same flat 4gb segment
moved gdt notes to documentation

use gs for vesa framebuffer (was fs) d88b1bcb70

more error handling for dd writes 2f391a0fc2

more error handling in detecting disk image creation ab21f9c838

will need ported to macOS sometime

force 1-1 logical to physical sectors 94034eb7bf

copy our VBR code to backup VBR

more comments to seperate setups f665d7fcaa

rename file to BOOT.BIN ccb82f29fc

K.I.S.S.

reduce proceedure local storage to 16 bytes 5ccd2fb12f

use kmemset to 0 out fat32_state in InitFATDriver 3a819a685a

fix passing stage2 wrong data for boot drive df3b8dfc0c

somewhat of a cludge, but added a macro to save all caller saved regs e8fb22c826

inlined ClusterToLBA 0250d9351d

removed caller save kludge for now
init first_root_dir_sector from ebpb data

correct src size in op d9e46f5571

split e820 bios call documentation to its own file under docs/ a8da6eef72

added bochs debug wrappers a3f0684c85

added macros to define cstr and str 5703bad704

aligned all the entry points for proceedures to 4 bytes
added a PrintString wraper macro

move macro definition super early d73a4eea6c

fix a few mistakes in macro defs

added debug config for bochs daa6337285

move far jump setup in EnterUnrealMode to right after we save CS 96de8cd9c7

ignore nasm symbol map files 6ff96deabc

remove PRINT_FUNC macro...this isn't it chief 9cde0333e6

output symbol maps to ease debuging 63421661a7

stage2 is now a multisection binary file 69c068f6be

also preparing to move memory globals to bss section.

moved stuff that is only referenced in Stage2 to stage2 bss 5a74cd86ad

minor cleanup related to memory refactor d1217182d4

BIOSMemoryMap is a location in bss now, use lea baa146bef5

use NASM defined size value from structure macro 12fc8a1e37

first version of kmemcpy5/kmemset4 bc89850c00

renamed mem.inc and removed unused items ac6ad77249

use early_mem.inc 83aa7d1147

definition corrections in part table stuff 5abbfa4d15

correct typo b49b2bae68

big step...and also its completely broken right now 8fea1f0a06

we are going to use 0x07E0 as our base segment so we have a bit
more memory to work with until we are fully in 32bit protected mode.

this commit is broken but is just one step towards a working release.

partially roll back changing the segment to 0x07E0 555cf1271b

follow standard proceedure and reallocate the mbr to 0x600 050f90517a

reduced stage2 to 24KiB c60bad1066

relocate code sections to end up with stage2 starting at 0x500 eb97aac673

remove map files as well 3d1877d7fe

unreal gdt tweaks & fixes 963dec5281

turns out huge unreal mode isn't supported in bochs ce6240249a

huge unreal mode is 4GiB code in 16bit mode + 4GiB data
we will just use the regular big flat model instead (64KiB code/4GiB data)

bss convertion for mbr stage c1a9d449df

remove defs for memory locations (moving to bss) a383f7cfb4

add reserved space for jmp short init at the start, technically this is part of the bpb anyways 3693eca940

initial work on a macro to call read_disk_raw f51d8b4142

pass location of partition_table structure to vbr 736aad85e5

fixed bss init in mbr 35e9aec059

bss for vbr stage 5ba7801926

added partition_table and fat32_bpb params to stage2 86564b2356

also the partition table and fat32_bpb and passed/copied from the mbr/vbr now

Merge pull request #3 from Nivirx/bss-setup 7617b11199

convert MBR, VBR, & Stage2 to use a BSS section.

use bx addressing in read_disk_raw cd833184da

enable magic in the normal bochsrc.txt 4a013b4a59

use bochs magic breakpoints in the error printer c49de28a15

makes it easier to get a good state to do some investigating before reseting.

replace text documentation with markdown cfda93048b

correct drive_num argument on read_disk_raw 56c18d8457

16 KiB stage2 f683b8fd17

change entry points (again) 4660882edb

I guess wx work again on Debian Trixie? 405a5ff20e

ha ha ha, again! 2020408e8d

include disk signature and reserved bytes in part table struct 5f9567d44e

reduced stack size in mbr stage b4621a7fb8

removed some unused data in bss
reordered how/when in init we set sp/bp and zero bss
we now push the top of the stack pointer/bp at the top of the stack, which makes the stack frame more 'normal'
also use movsb instead of movsw

moved stack to end of bss & reduced size for now. aa8c7b67ab

removed redzone label
reordered sp/bp setup and bss zeroing in init:
fixed kmemcpy call stack usage

removed bpb_offset_bx dep a97e3bea9b

reworked init: process
512 byte stack...should be more than enough for the vbr

turn off magic debug in mbr/vbr stages 50b08f6b72

magic debug before touching anything in error printer 56e8081118

correct size of operand in PrintDWORD 5159ef8a7c

added some magic debug points for stuff that isn't working as well.

align to 16 byte bounds and add git info to build 7f6436297e

remove jmp short init at the start of stage2 fb54c65caf

also correct total size output as combined .data + .text

remove some redundant reloads of si e680620148

use xchg to swap si/di instead of the stack
uninline ClusterToLBA call

some debuging text for fat32 stuff c9f4b18d2b

added carry and divz checks across the fat32 code e33f010f73

also use the pointers we have in bss to our saved data

changing names of values to match spec more e12ea89fda

also added prototype for FS info printer that will print some basic santity check type info.

move fsinfo just for my easy reading b5cc1c9ec1

rewrite InitFATDriver to use si/di/bx relative addresses 85a8f0da1c

changed informational strings 2b3ab1dc3a

remove newline and fix stack at end 496a389ba4

clear dh and al 9d4479bd86

bit smaller of an instruction 6942c4dbb4

correction 4708c78d54

update field name ccf846909a

update a few missed fields and correct ALIGN on FSInfoPrinter 508bf1aa55

disable bad cluster jmp for now

make space in bss directly for boot_drive and partition offsets 520f877b05

add fastcall-ish macro for light functions 046821ff7a

only does a stack frame setup with no locals space

ClusterToLBA to fastcall 45aeb9b3d0

cleanup of NextCluster

clean up of comments b606e28958

clean up 48f0de8f7b

correct some field sizes 94c2a1626d

use bx rel addressing for fat32_state in SearchFATDIR b7e2a8e886

use movzx instead of goofy mov word and and mask the upper bits d98786072c

clear Next cluster data in bss on every NextCluster call 6ff9a2307f

corrected a few instances of accessing boot_drive incorrectly after the location change ee9fd9b684

clarify clobbers 4535b89eaf

typo 3bdef99939

might have fixed some of the boot_drive issues with ext_read 63a1a1beea

moved varibles passed from vbr to .data section 37eb87239c

this is to work around having to save them without .bss ready

more bug catching after changing the location of data 56b86fe12e

also cleanup comment from previous bug

Merge upstream changes from branch 'trunk' into fat32_sys_rewrite 9918f2367e

minor cleanup and add dev enviroment files to gitignore d6e8a2a923

update macos build script ce73226eee

inlined ClusterToLBA into ReadFATCluster ddd3f35a8b

fixed a bug where fat32_state wasn't being updated...

minor edit aa181bbae4

Merge branch 'fat32_sys_rewrite' of github.com:Nivirx/stevia into fat32_sys_rewrite 531f4fa25f

macro defines this as BootTarget_cstr_cstr...fix this b2c5a6bf46

Update licensing and switch back to GPLv3 😅 8d5996566e

nivirx commented

2025-08-22 12:01:43 -04:00

merged with 8129a71fdd

merged with 8129a71fdd9b532b9da24fb4f9cd53d128d458e7

nivirx closed this pull request

2025-08-22 12:01:43 -04:00

Pull request closed

Please reopen this pull request to perform a merge.

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Reference: nivirx/stevia#5