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kernel: Add `launch_fxf_from_open_file`

main
Ry 2023-07-10 17:59:21 -07:00
parent c101b58dea
commit 012511bf5f
2 changed files with 49 additions and 40 deletions
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38
kernel/fxf/launch.asm
View File

@ -1,5 +1,33 @@
; FXF launching routines
; launch an FXF binary from an already opened file
; inputs:
; r0: pointer to file struct
; r1: reserved
; r2: argument 0
; r3: argument 1
; r4: argument 2
; r5: argument 3
; r6: argument 4
; outputs:
; r0: task ID of the new task, or 0xFFFFFFFF if error
launch_fxf_from_open_file:
push r1
push r2
push r3
push r4
push r5
push r6
push r2
push r3
push r4
push r5
push r6
mov [launch_fxf_struct_ptr], r0
jmp launch_fxf_from_open_file_1
; launch an FXF binary from a file on disk
; inputs:
; r0: pointer to FXF binary name (8.3 format, for example "testfile.fxf" or "test.fxf")
@ -26,13 +54,14 @@ launch_fxf_from_disk:
push r6
; open the file
mov r2, launch_fxf_struct
mov [launch_fxf_struct_ptr], launch_fxf_struct
mov r2, [launch_fxf_struct_ptr]
call open
cmp r0, 0
ifz jmp launch_fxf_from_disk_file_error
launch_fxf_from_open_file_1:
; allocate memory for the binary
mov r0, launch_fxf_struct
mov r0, [launch_fxf_struct_ptr]
call get_size
call allocate_memory
cmp r0, 0
@ -40,7 +69,7 @@ launch_fxf_from_disk:
mov [launch_fxf_binary_ptr], r0
; read the file into memory
mov r0, launch_fxf_struct
mov r0, [launch_fxf_struct_ptr]
mov r1, [launch_fxf_binary_ptr]
call ryfs_read_whole_file
@ -109,6 +138,7 @@ launch_fxf_from_disk_file_error:
mov r0, 0xFFFFFFFF
ret
launch_fxf_struct_ptr: data.32 0
launch_fxf_struct: data.fill 0, 32
launch_fxf_task_id: data.8 0
launch_fxf_binary_ptr: data.32 0

51
kernel/main.asm
View File

@ -28,6 +28,7 @@ jump_table:
org.pad 0x00000110
data.32 parse_fxf_binary
data.32 launch_fxf_from_disk
data.32 launch_fxf_from_open_file
; task jump table
org.pad 0x00000210
@ -201,47 +202,25 @@ load_startup_task:
mov r2, startup_file_struct
call ryfs_open
cmp r0, 0
ifz jmp boot_disk_1
ifz jmp startup_error
; allocate memory for the startup file
; create a new task and yield to it
mov r0, startup_file_struct
call get_size
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 r0, startup_file_struct
mov r1, [startup_file_binary_ptr]
call ryfs_read_whole_file
; relocate and execute it as a new task
mov r0, r1
call parse_fxf_binary
mov r3, r1
mov r1, r0
movz.8 r0, [next_task_id]
mov r2, [startup_file_stack_ptr]
add r2, 65536
sub r2, 4
mov r4, [startup_file_stack_ptr]
call new_task
mov r1, 0
mov r2, 0
mov r3, 0
mov r4, 0
mov r5, 0
mov r6, 0
call launch_fxf_from_open_file
; 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]
; we do this by checking to see if the size of startup.cfg is less than or equal to 12 * next_task bytes
inc.8 [next_task]
mov r0, startup_cfg_struct
call get_size
movz.8 r1, [next_task_id]
movz.8 r1, [next_task]
mul r1, 12
cmp r0, r1
iflteq jmp no_other_tasks
@ -306,7 +285,7 @@ boot_disk_1_loop:
ifz jmp disk_1_is_not_fxf
mov r3, r1
mov r1, r0
movz.8 r0, [next_task_id]
movz.8 r0, 0
mov r2, rsp
sub r2, 4
mov r4, 0 ; don't attempt to free any stack block if the task ends
@ -434,7 +413,7 @@ bottom_bar_patterns:
data.32 0xFFFFFFFF
data.32 0xFF674764
next_task_id: data.8 0
next_task: data.8 0
current_disk_id: data.8 0
startup_cfg: data.str "startup cfg"
startup_cfg_struct: data.32 0 data.32 0