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rdos/kernel/main.asm

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NASM
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Change kernel blob format to be option rom compatible
2019-04-20 23:02:35 +02:00
cpu 8086
Run kernel with from offset 0 I try to get the interrupt handlers into a offset as low as possible. This is necessity if i want to relocate it later on its own. For running from HMA, a minimal offset of 16 bytes would still be necessary.
2019-09-24 00:06:25 +02:00
org 0x0
Rework interrupt handling, realign stuff for relative jumps
2019-09-10 23:38:52 +02:00
jmp init
Change kernel blob format to be option rom compatible
2019-04-20 23:02:35 +02:00
Add basic 21h functions
2019-09-06 00:24:39 +02:00
isr_dos_main:
Rework interrupt handling, realign stuff for relative jumps
2019-09-10 23:38:52 +02:00
cmp ah, 0x01
je isr_getc_echo
cmp ah, 0x02
je isr_putc
Remove intr function not in line with int 21h If we have them, use them for setting up ourselves
2019-09-10 23:50:58 +02:00
cmp ah, 0x25
je isr_intr_register
Rework interrupt handling, realign stuff for relative jumps
2019-09-10 23:38:52 +02:00
jmp isr_invalid
Work on interrupt subfunctions, remove drvtab experiments
2019-09-08 17:18:37 +02:00
Rework interrupt handling, realign stuff for relative jumps
2019-09-10 23:38:52 +02:00
%include "intr.asm"
Remove intr function not in line with int 21h If we have them, use them for setting up ourselves
2019-09-10 23:50:58 +02:00
%include "chario.asm"
Work on interrupt subfunctions, remove drvtab experiments
2019-09-08 17:18:37 +02:00
; ISR for invalid subfunctions or unimplemented
isr_invalid:
mov bp, 0xFEFE
int3
.hlt:
hlt
jmp .hlt
; ISR tail to set carry flag to signal error
Add basic 21h functions
2019-09-06 00:24:39 +02:00
isr_error:
push bp
mov bp, sp
; set carry flag
or WORD [SS:BP+6], 1
pop bp
isr_return:
iret
Add attempt for drive table to kernel
2019-09-19 22:02:16 +02:00
%include "drive.asm"
Rework interrupt handling, realign stuff for relative jumps
2019-09-10 23:38:52 +02:00
init:
Remove intr function not in line with int 21h If we have them, use them for setting up ourselves
2019-09-10 23:50:58 +02:00
mov ax, cs
mov ds, ax
mov es, ax
Work on interrupt subfunctions, remove drvtab experiments
2019-09-08 17:18:37 +02:00
WIP for config.sys parsing
2019-09-25 22:45:50 +02:00
call config_first_run
Add attempt for drive table to kernel
2019-09-19 22:02:16 +02:00
mov di, kernel_end
call drive_setup
Remove intr function not in line with int 21h If we have them, use them for setting up ourselves
2019-09-10 23:50:58 +02:00
mov dx, isr_dos_main
mov ax, 0x2521
pushf
push cs
call isr_dos_main
Add drive table initialisation
2019-09-03 12:58:06 +02:00
Add attempt for drive table to kernel
2019-09-19 22:02:16 +02:00
mov dl, 0x37
mov ah, 0x02
int 0x21
Rework interrupt handling, realign stuff for relative jumps
2019-09-10 23:38:52 +02:00
cli
.halt:
hlt
jmp .halt
Add basic 21h functions
2019-09-06 00:24:39 +02:00
Factor out string token search
2019-09-28 14:37:16 +02:00
%include "string.asm"
WIP for config.sys parsing
2019-09-25 22:45:50 +02:00
%include "config.asm"
Add attempt for drive table to kernel
2019-09-19 22:02:16 +02:00
Work on interrupt subfunctions, remove drvtab experiments
2019-09-08 17:18:37 +02:00
kernel_end:
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