update github workflow since github includes firefox & snaps in the default runner image, which causes the build to fail.

going to need a custom runner I guess...might as well only do actions on gitea.

.github/workflows/daily.yaml

@@ -3,7 +3,7 @@ on:
   push:
     branches: [ $default-branch ]
   schedule:
-    - cron: "0 7 * * *"   # daily 07:00
+    - cron: "0 7 * * 1"   # mondays at 07:00
   workflow_dispatch: {}
 
 jobs:

include/cdecl16.inc

@@ -44,11 +44,13 @@
 ;   for use inside of function bodies
 %ifnmacro __CDECL16_PROC_ARGS
 %macro __CDECL16_PROC_ARGS 1
+    %push __CDECL16_PROC_ARGS
     %assign %$__i 1
     %rep %1
         %xdefine %$arg%$__i  [bp + 4 + 2*(%$__i-1)]
         %assign  %$__i %$__i + 1
     %endrep
+    %pop
 %endmacro
 %endif
 
@@ -56,10 +58,9 @@
 ;   handles pushing values to the stack in the correct order
 %ifnmacro __CDECL16_CALL_ARGS
 %macro __CDECL16_CALL_ARGS 1-*
-    %assign %$__i %0
     %rep %0
-        push %[%$__i]
-        %assign %$__i %$__i - 1
+        %rotate -1      ; move the last argument into %1
+        push %1         ; push last, then next-to-last, ...
     %endrep
 %endmacro
 %endif
@@ -79,57 +80,46 @@
 ;   count the stack frame to restore later!
 %ifnmacro __CDECL16_CALL_ARGS_SIZED
 %macro __CDECL16_CALL_ARGS_SIZED 2-*
+    %push __CDECL16_CALL_ARGS_SIZED
     call %1
     %assign %$__sum 0
     %assign %$__i 2
     %rep %0-1
-        %assign %$__sum %$__sum + %[%$__i]
+        %assign %$__sum %$__sum + %[%$__i]   ; sizes may be expressions
         %assign %$__i %$__i + 1
     %endrep
-    add sp, %$__sum
-%endmacro
-%endif
-
-; __CDECL16_INVOKE func, arg1[, arg2 ...]
-;   pushes args right-to-left, calls, then add sp by (#args)*2
-;   !!! warning for word sized args only !!!
-%ifnmacro __CDECL16_INVOKE
-%macro __CDECL16_INVOKE 1-*
-    %assign %$__argc %0-1
-    %if %$__argc > 0
-        ; push args right-to-left
-        %assign %$__i %0
-        %rep %$__argc
-            push %[%$__i]
-            %assign %$__i %$__i - 1
-        %endrep
-        call %1
-        add  sp, %$__argc*2
-    %else
-        call %1
+    %if %$__sum & 1
+        %error "__CDECL16_CALL_ARGS_SIZED: total size is odd; pushes must sum to whole bytes actually pushed (usually even)."
     %endif
+    add sp, %$__sum
+    %pop
 %endmacro
 %endif
 
 %ifnmacro __CDECL16_CLOB
-; e.g CLOB ax dx ... inside func entry, then UNCLOB ax dx at all exits
-; ordering is already taken care of 
-; i.e if you CLOB ax cx dx then UNCLOB ax cx dx, the unclob is reversed
+; Save registers in the order listed. Supports "flags" as a pseudo-reg.
 %macro __CDECL16_CLOB 1-*
-    %assign %$i 1
     %rep %0
-        push %[%$i]
-        %assign %$i %$i+1
+        %ifidni %1, flags
+            pushf
+        %else
+            push %1
+        %endif
+        %rotate 1
     %endrep
 %endmacro
 %endif
 
 %ifnmacro __CDECL16_UNCLOB
+; Restore in reverse order of CLOB. Supports "flags".
 %macro __CDECL16_UNCLOB 1-*
-    %assign %$i %0
     %rep %0
-        pop %[%$i]
-        %assign %$i %$i-1
+        %rotate -1
+        %ifidni %1, flags
+            popf
+        %else
+            pop %1
+        %endif
     %endrep
 %endmacro
 %endif

include/fat32/FAT32_SYS.inc

@@ -25,14 +25,9 @@ ALIGN 4, db 0x90
 InitFATDriver:
     __CDECL16_PROC_ENTRY
 .func:
-    mov ax, FAT32_State_t_size
-    push ax                     ; length of fat32_state structure
-    xor ax, ax
-    push ax                     ; init fat32_state with zero
-    mov ax, fat32_state
-    push ax                     ; address of structure
-    call kmemset
-    add sp, 0x6
+
+    __CDECL16_CALL_ARGS fat32_state, 0x0000, FAT32_State_t_size
+    __CDECL16_CALL kmemset, 3
 
 .calc_active_part:
     mov ax, word [partition_offset]            
@@ -106,16 +101,17 @@ ALIGN 4, db 0x90
 SearchFATDIR:
     __CDECL16_PROC_ENTRY
 .file_lookup:
-    print_string SearchFATDIR_info
+    __CDECL16_CALL_ARGS SearchFATDIR_info
+    __CDECL16_CALL PrintString, 1
+
     mov bx, fat32_state
     .load_first_dir:
-        mov eax, dword [bx + FAT32_State_t.curr_dir_cluster_32]
-        push dword eax          ; cluster
-        mov ax, dir_buffer
-        push ax                 ; offset
-        xor ax, ax
-        push ax                 ; segment
-        call ReadFATCluster     ; uint8_t ReadFATCluster(uint16_t seg, uint16_t offset, uint32_t cluster)
+
+        ; uint8_t ReadFATCluster(uint16_t seg, uint16_t offset, uint32_t cluster)
+        push dword [bx + FAT32_State_t.curr_dir_cluster_32]          ; cluster
+        push dir_buffer                                              ; offset
+        push 0x0000                                                  ; segment
+        call ReadFATCluster
         add sp, 0x8
 
         mov si, dir_buffer
@@ -124,10 +120,10 @@ SearchFATDIR:
     .load_next_dir:
         ; if eax >= 0x0FFFFFF8 then there are no more clusters (end of chain)
         ; if eax == 0x0FFFFFF7 then this is a cluster that is marked as bad
-        
-        mov eax, dword [bx + FAT32_State_t.curr_dir_cluster_32]
-        push dword eax
-        call NextCluster        ; uint32_t NextCluster(uint32_t active_cluster);
+
+        ; uint32_t NextCluster(uint32_t active_cluster);
+        push dword [bx + FAT32_State_t.curr_dir_cluster_32]
+        call NextCluster        
         add sp, 0x4
 
         cmp eax, 0x0fff_fff7
@@ -137,16 +133,14 @@ SearchFATDIR:
 
     .load_next_dir_next_OK:
         ; load 512 bytes of directory entries from data sector
-        mov eax, [bx + FAT32_State_t.curr_dir_cluster_32]
-        push dword eax          ; cluster
 
-        mov ax, dir_buffer    
-        push ax                 ; offset
-
-        xor ax, ax
-        push ax                 ; segment
-        call ReadFATCluster     ; uint8_t ReadFATCluster(uint16_t seg, uint16_t offset, uint32_t cluster)
+        ; uint8_t ReadFATCluster(uint16_t seg, uint16_t offset, uint32_t cluster)
+        push dword [bx + FAT32_State_t.curr_dir_cluster_32] ; cluster   
+        push dir_buffer                                     ; offset
+        push 0x0000                                         ; segment
+        call ReadFATCluster     
         add sp, 0x8
+
     .empty_dir_entry:
         ; check for 0x0 in first byte, if true then there are no more files
         ; if true we did not find the file, we should error here
@@ -176,7 +170,9 @@ SearchFATDIR:
 
     ; TODO: move this to a seperate string search function
     .parse_dir:
-        print_string MaybeFound_Boot_info
+        __CDECL16_CALL_ARGS MaybeFound_Boot_info
+        __CDECL16_CALL PrintString, 1
+        
         .lfn_check:
             ; check for ATTR_READ_ONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME_ID  (0x0F) in offset 11
             ; TODO: going to skip LFN for now, since all valid volumes will have SFN's
@@ -212,18 +208,13 @@ ALIGN 4, db 0x90
 NextCluster:
     __CDECL16_PROC_ENTRY
 .func:
-    print_string NextFATCluster_info
+    __CDECL16_CALL_ARGS NextFATCluster_info
+    __CDECL16_CALL PrintString, 1
 
-    mov ax, FAT32_NextClusterData_t_size
-    push ax                     ; length
-    xor ax, ax
-    push ax                     ; init with zero
-    mov ax, fat32_nc_data
-    push ax                     ; address of structure
-    call kmemset
-    add sp, 0x6
+    __CDECL16_CALL_ARGS fat32_nc_data, 0x0000, FAT32_NextClusterData_t_size
+    __CDECL16_CALL kmemset, 3
 
-    mov edx, dword [bp + 4]
+    mov edx, dword [bp + 4]                      ; active_cluster
     mov si, fat32_nc_data                        ; instead of push/pop and moving the data back
     mov di, fat32_bpb                            ; load si & di then use xchg
     mov bx, fat32_state
@@ -270,10 +261,11 @@ NextCluster:
 ;                         uint32_t lba,
 ;                         uint16_t count, uint16_t drive_num)
 .read_cluster:
-; next_cluster = fat_buffer[entry_offset]
+    ; next_cluster = fat_buffer[entry_offset]
     mov ebx, dword [si + FAT32_NextClusterData_t.entry_offset]
     mov si, fat_buffer
     mov eax, dword [bx+si+0]
+    ; BUG: ???
 .endp:
     __CDECL16_PROC_EXIT
     ret
@@ -285,7 +277,8 @@ ALIGN 4, db 0x90
 ReadFATCluster:
     __CDECL16_PROC_ENTRY
 .func:
-    print_string ReadFATCluster_info
+    __CDECL16_CALL_ARGS ReadFATCluster_info
+    __CDECL16_CALL PrintString, 1
 
     mov bx, fat32_bpb
     mov si, fat32_ebpb

scripts/create-disk.sh

@@ -124,8 +124,11 @@ if [[ "$OSTYPE" == "linux-gnu"* ]]; then
         echo "[2/7] Write DOS partition table (single FAT32 LBA @ 2048)"
         "$SF" --no-reread "$disk_img" < /tmp/pt.sfdisk
 
-        echo "[3/7] Make FAT32 filesystem in partition image"
-        "$MKFS" -v -F32 -s 1 -n 'STEVIAFS' "$part_img"
+        # BUG: the default disk img is 256MiB which mkfs.fat wants to create
+        #      a FAT16 FS by default. it needs to be at least 2GiB to to 'lock out'
+        #      FAT16 as an option. Force FAT32 here, might(?) break some things.
+        echo "[3/7] Make FAT filesystem in partition image"
+        "$MKFS" -F32 -v -n 'STEVIAFS' "$part_img"
 
         echo "[4/7] Patch VBR inside partition image (preserve BPB)"
 

src/stage2/stage2.nasm

@@ -34,13 +34,6 @@
 %include "early_mem.inc"
 %include "error_codes.inc"
 
-%macro print_string 1
-    mov ax, %1
-    push ax
-    call PrintString
-    add sp, 0x2
-%endmacro
-
 section .text
 begin_text:
 ; dl = byte boot_drive
@@ -135,60 +128,54 @@ main:
     je main.stage2_main
     ERROR STAGE2_SIGNATURE_MISSING
 .stage2_main:
-    mov ax, PartTable_t_size
-    push ax                                                 ; len = PartTable_t_size
-    mov ax, word [vbr_part_table_ptr]                       ; src = ptr to vbr partition_table
-    push ax
-    mov ax, partition_table                                 ; dst
-    push ax
-    call kmemcpy                                            ; copy partition table data to .data section in stage2
-    add sp, 0x6
+    ; copy partition table data to .data section in stage2
+    __CDECL16_CALL_ARGS partition_table, word [vbr_part_table_ptr], PartTable_t_size
+    __CDECL16_CALL kmemcpy, 3
 
-    mov ax, (FAT32_bpb_t_size + FAT32_ebpb_t_size)          ; len
-    push ax
-    mov ax, word [vbr_fat32_bpb_ptr]                        ; src            
-    push ax
-    mov ax, fat32_bpb                                       ; dst
-    push ax
-    call kmemcpy                                            ; copy bpb & ebpb to memory
-    add sp, 0x6
+    ; copy bpb & ebpb to memory
+    __CDECL16_CALL_ARGS fat32_bpb, word [vbr_fat32_bpb_ptr], (FAT32_bpb_t_size + FAT32_ebpb_t_size) 
+    __CDECL16_CALL kmemcpy, 3
 
     call SetTextMode
     call disable_cursor_bios
-    print_string HelloPrompt_info
-    
-    ; setup the early heap
-    mov ax, early_heap_state    
-    push ax                             ; address in bss of state structure
-    call arena_init
-    add sp, 0x2
 
+    __CDECL16_CALL_ARGS HelloPrompt_info
+    __CDECL16_CALL PrintString, 1
+
+    ; setup the early heap
+    __CDECL16_CALL_ARGS early_heap_state
+    
     ; enable A20 gate
     call EnableA20
-    print_string A20_Enabled_OK_info
+    __CDECL16_CALL_ARGS A20_Enabled_OK_info
+    __CDECL16_CALL PrintString, 1
 
     ; get system memory map
     call GetMemoryMap
-    print_string MemoryMap_OK_info
+    __CDECL16_CALL_ARGS MemoryMap_OK_info
+    __CDECL16_CALL PrintString, 1
 
     ; enter unreal mode (enter PM w/ 16 bit code, 32 bit flat memory model & return to real)
     ; ds, es will be set to the 64KiB STAGE2_SEGMENT, fs/gs will be flat/huge memory (4GiB)
     ; use __REFLAT macros to re-flat ds/es for easy transfers to >1MiB
     ; NOTE: if you modify a segment register you will need to re-unreal it
     call EnterUnrealMode
-    print_string UnrealMode_OK_info
+    __CDECL16_CALL_ARGS UnrealMode_OK_info
+    __CDECL16_CALL PrintString, 1
 
     ; FAT Driver setup
     call InitFATDriver
-    print_string InitFATSYS_OK_info
+    __CDECL16_CALL_ARGS InitFATSYS_OK_info
+    __CDECL16_CALL PrintString, 1
 
     ;
     ; Find first cluster of bootable file
     call SearchFATDIR
     push dword eax      ; save first cluster of bootable file
 
-    print_string FileFound_OK_info
-    
+    __CDECL16_CALL_ARGS FileFound_OK_info
+    __CDECL16_CALL PrintString, 1
+
     pop dword eax
     push dword eax      ; print Cluster of boot file
     call PrintDWORD     ; void PrintDWORD(uint32_t dword)
@@ -274,9 +261,6 @@ EnterUnrealMode:
 
     ; set cs to a pm code segment (0x8) w/ the following
     jmp 0x0008:EnterUnrealMode.set_segs
-    ;db 0xEA                               ; jmp far imm16:imm16
-    ;dw EnterUnrealMode.set_segs           ; error_far_ptr
-    ;dw 0x0008                             ; error_far_seg
 .set_segs:
     mov ax, 0x10                          ; select descriptor 2
     mov ds, ax                            ; 10h = 0001_0000b
@@ -291,7 +275,7 @@ EnterUnrealMode:
     mov eax, cr0
     and eax, ~1                           ; toggle bit 1 of cr0
     mov cr0, eax                          ; back to realmode
-    jmp 0x0000:EnterUnrealMode.endp
+    jmp __STAGE2_SEGMENT:EnterUnrealMode.endp
 .endp:
     sti                                   ; re-enable interupts