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Allow starting multiple FXF binaries at startup

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This commit is contained in:
Ry 2022-09-09 16:37:13 -07:00
parent b3c9c83c86
commit ee2103eda5
1 changed files with 58 additions and 13 deletions
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71
kernel/main.asm
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@ -58,16 +58,18 @@ entry:
call draw_format_str_to_background
; open startup.cfg
mov r0, startup_file
mov r0, startup_cfg
mov r1, 0
mov r2, startup_file_struct
mov r2, startup_cfg_struct
call ryfs_open
cmp r0, 0
ifz jmp boot_disk_1
; load the first 11 bytes of startup.cfg, overwriting the "startup cfg" string
; load a startup task
load_startup_task:
; load 11 bytes of startup.cfg into startup_file
mov r0, 11
mov r1, startup_file_struct
mov r1, startup_cfg_struct
mov r2, startup_file
call ryfs_read
@ -85,25 +87,54 @@ entry:
call allocate_memory
cmp r0, 0
ifz jmp memory_error
mov [startup_file_binary_ptr], r0
; allocate 64KiB for the startup file's stack
mov r0, 65536
call allocate_memory
cmp r0, 0
ifz jmp memory_error
mov [startup_file_stack_ptr], r0
; read the startup file into memory
mov r1, r0
mov r0, startup_file_struct
mov r1, [startup_file_binary_ptr]
call ryfs_read_whole_file
; relocate and execute it as a new task
run_startup_task:
mov r0, r1
call parse_fxf_binary
mov r3, r1
mov r1, r0
mov r0, 0
mov r2, rsp
movz.8 r0, [next_task_id]
mov r2, [startup_file_stack_ptr]
add r2, 65536
sub r2, 4
mov r4, 0 ; don't attempt to free any stack block if the task ends
mov r4, [startup_file_stack_ptr]
call new_task
; when the startup file yields for the first time, we'll end up back here.
; when the startup file yields for the first time, we'll end up back here
; now, check to see if startup.cfg has any other entries
; we do this by checking to see if the size of startup.cfg is less than or equal to 12 * next_task_id bytes
inc.8 [next_task_id]
mov r0, startup_cfg_struct
call ryfs_get_size
movz.8 r1, [next_task_id]
mul r1, 12
cmp r0, r1
iflteq jmp no_other_tasks
; seek forward one byte to skip the linefeed
mov r0, startup_cfg_struct
call ryfs_tell
inc r0
mov r1, startup_cfg_struct
call ryfs_seek
; load the next task
jmp load_startup_task
no_other_tasks:
; jump back to it without adding this "task" (not really a task) into the queue.
; end_current_task_no_mark_no_free is used specifically because it doesn't mark
; the current task (still set to 0) as unused, and it doesn't free the memory
@ -144,7 +175,16 @@ boot_disk_1_loop:
loop boot_disk_1_loop
mov r1, r5
jmp run_startup_task
mov r0, r5
call parse_fxf_binary
mov r3, r1
mov r1, r0
movz.8 r0, [next_task_id]
mov r2, rsp
sub r2, 4
mov r4, 0 ; don't attempt to free any stack block if the task ends
call new_task
call end_current_task_no_mark_no_free
startup_error:
mov r0, BACKGROUND_COLOR
@ -188,10 +228,15 @@ get_os_version:
startup_str: data.str "fox32 - OS version %u.%u.%u" data.8 0
startup_error_str: data.str "fox32 - OS version %u.%u.%u - startup.cfg is invalid!" data.8 0
memory_error_str: data.str "fox32 - OS version %u.%u.%u - not enough memory to load startup file!" data.8 0
memory_error_str: data.str "fox32 - OS version %u.%u.%u - not enough memory to perform operation!" data.8 0
startup_file: data.str "startup cfg"
next_task_id: data.8 0
startup_cfg: data.str "startup cfg"
startup_cfg_struct: data.32 0 data.32 0
startup_file: data.str " "
startup_file_struct: data.32 0 data.32 0
startup_file_binary_ptr: data.32 0
startup_file_stack_ptr: data.32 0
#include "../../fox32rom/fox32rom.def"