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sketch on init.app #10

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17 changes: 7 additions & 10 deletions src/monitor.asm
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Original file line number Diff line number Diff line change
Expand Up @@ -123,24 +123,20 @@ bmfs:
mov al, 'B'
mov [FSType], al

; Detect if there is only one program on the filesystem
; Detect if first file is called 'init.app'
mov rdi, temp_string
mov rsi, rdi
mov rax, 1
add rax, [UEFI_Disk_Offset]
mov rcx, 1
mov rdx, 0
call [b_storage_read] ; Load the 4K BMFS file table
add rsi, 64 ; Is there a second file entry?
mov al, [rsi]
cmp al, 0
jne poll ; If so, skip to poll
sub rsi, 64 ; Is there a first file entry?
mov al, [rsi]
cmp al, 0
je poll ; If not, skip to poll

; There is a single program, load and execute it
mov rsi, init_app_str
call string_compare ; Is the first file called 'init.app'?
jnc poll

; First file is called 'init.app' so load and execute it
add rdi, 32 ; Offset to starting block # in BMFS file record
mov rax, [rdi]
shl rax, 9 ; Shift left by 9 to convert 2M block to 4K sector
Expand Down Expand Up @@ -1099,6 +1095,7 @@ message_load: db 10, 'Enter file number: ', 0
message_unknown: db 10, 'Unknown command', 0
message_noFS: db 10, 'No filesystem detected', 0
message_help: db 10, 'Available commands:', 10, 'cls - clear the screen', 10, 'dir - Show programs currently on disk', 10, 'load - Load a program to memory (you will be prompted for the program number)', 10, 'exec - Run the program currently in memory', 10, 'ver - Show the system version', 10, 'peek - hex mem address and bytes (1, 2, 4, or 8) - ex "peek 200000 8" to read 8 bytes', 10, 'poke - hex mem address and hex value (1, 2, 4, or 8 bytes) - ex "poke 200000 00ABCDEF" to write 4 bytes', 10, 'dump - hex mem address, hex amount, bytes (1, 2, 4, or 8) - ex "dump 100000 10 4"', 0
init_app_str: db 'init.app', 0
command_exec: db 'exec', 0
command_cls: db 'cls', 0
command_dir: db 'dir', 0
Expand Down