153 lines
3.8 KiB
NASM
153 lines
3.8 KiB
NASM
; fox32os kernel
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org 0x00000800
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const FOX32OS_VERSION_MAJOR: 0
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const FOX32OS_VERSION_MINOR: 1
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const FOX32OS_VERSION_PATCH: 0
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const BACKGROUND_COLOR: 0xFF674764
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const TEXT_COLOR: 0xFFFFFFFF
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const STARTUP_TASK_LOAD_ADDRESS: 0x03000000
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jmp entry
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jump_table:
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; system jump table
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org.pad 0x00000810
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data.32 get_os_version
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; FXF jump table
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org.pad 0x00000820
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data.32 parse_fxf_binary
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; task jump table
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org.pad 0x00000830
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data.32 new_task
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data.32 yield_task
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data.32 end_current_task
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; memory jump table
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org.pad 0x00000840
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data.32 allocate_memory
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; initialization code
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entry:
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; clear the background
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mov r0, BACKGROUND_COLOR
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call fill_background
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draw_startup_text:
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mov r0, startup_str
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mov r1, 16
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mov r2, 464
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mov r3, TEXT_COLOR
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mov r4, 0x00000000
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mov r10, FOX32OS_VERSION_MAJOR
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mov r11, FOX32OS_VERSION_MINOR
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mov r12, FOX32OS_VERSION_PATCH
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call draw_format_str_to_background
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; open startup.cfg
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mov r0, startup_file
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mov r1, 0
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mov r2, startup_file_struct
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call ryfs_open
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cmp r0, 0
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ifz jmp boot_disk_1
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; load the first 11 bytes of startup.cfg, overwriting the "startup cfg" string
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mov r0, 11
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mov r1, startup_file_struct
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mov r2, startup_file
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call ryfs_read
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; open the actual startup file
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mov r0, startup_file
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mov r1, 0
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mov r2, startup_file_struct
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call ryfs_open
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cmp r0, 0
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ifz jmp boot_disk_1
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; read the startup file into memory starting at STARTUP_TASK_LOAD_ADDRESS
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mov r0, startup_file_struct
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mov r1, STARTUP_TASK_LOAD_ADDRESS
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call ryfs_read_whole_file
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; relocate and execute it as a new task
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run_startup_task:
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mov r0, STARTUP_TASK_LOAD_ADDRESS
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call parse_fxf_binary
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mov r1, r0
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mov r0, 0
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mov r2, rsp
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call new_task
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; when the startup file yields for the first time, we'll end up back here
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; jump back to it without adding this "task" (not really a task) into the queue
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; end_current_task_no_mark is used specifically because it doesn't mark the current task (still set to 0) as unused
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; this does not return
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call end_current_task_no_mark
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; if startup.cfg is invalid, try loading the raw contents of disk 1 as an FXF binary
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; if disk 1 is not inserted, then fail
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boot_disk_1:
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; check if a disk is inserted as disk 1
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in r31, 0x80001001
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cmp r31, 0
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ifz jmp startup_error
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; a disk is inserted, load it!!
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div r31, 512
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inc r31
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mov r0, 0 ; sector counter
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mov r2, STARTUP_TASK_LOAD_ADDRESS ; destination pointer
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mov r3, 0x80003001 ; command to read a sector from disk 01 into memory
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mov r4, 0x80002000 ; command to set the location of the buffer
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boot_disk_1_loop:
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out r4, r2 ; set the memory buffer location
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out r3, r0 ; read the current sector into memory
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inc r0 ; increment sector counter
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add r2, 512 ; increment the destination pointer
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loop boot_disk_1_loop
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jmp run_startup_task
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startup_error:
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mov r0, BACKGROUND_COLOR
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call fill_background
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mov r0, startup_error_str
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mov r1, 16
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mov r2, 464
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mov r3, TEXT_COLOR
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mov r4, 0x00000000
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mov r10, FOX32OS_VERSION_MAJOR
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mov r11, FOX32OS_VERSION_MINOR
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mov r12, FOX32OS_VERSION_PATCH
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call draw_format_str_to_background
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rjmp 0
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get_os_version:
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mov r0, FOX32OS_VERSION_MAJOR
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mov r1, FOX32OS_VERSION_MINOR
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mov r2, FOX32OS_VERSION_PATCH
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ret
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#include "allocator.asm"
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#include "fxf/fxf.asm"
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#include "task.asm"
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startup_str: data.str "fox32 - OS version %u.%u.%u" data.8 0
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startup_error_str: data.str "fox32 - OS version %u.%u.%u - startup.cfg is invalid!" data.8 0
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startup_file: data.str "startup cfg"
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startup_file_struct: data.32 0 data.32 0
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#include "../../fox32rom/fox32rom.def"
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kernel_bottom:
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