diff options
Diffstat (limited to 'atk16_asm/builtin_asm/bootstrap.atk16')
| -rw-r--r-- | atk16_asm/builtin_asm/bootstrap.atk16 | 56 |
1 files changed, 29 insertions, 27 deletions
diff --git a/atk16_asm/builtin_asm/bootstrap.atk16 b/atk16_asm/builtin_asm/bootstrap.atk16 index 9b024e6..94eed4c 100644 --- a/atk16_asm/builtin_asm/bootstrap.atk16 +++ b/atk16_asm/builtin_asm/bootstrap.atk16 @@ -1,18 +1,5 @@ @let SP RH -; vector table fields -@let vector_table 0x10 -@let vt_ISR0 0x10 ; ISR0 -@let vt_ISR1 0x11 ; ISR1 -@let vt_ISR2 0x12 ; ISR2 -@let vt_ISR3 0x13 ; ISR3 -@let vt_stack_addr 0x14 ; Stack address -@let vt_term_pp_addr 0x15 ; Terminal peripheral address -@let vt_kb_pp_addr 0x16 ; Keyboard peripheral address -@let vt_gr_mode_addr 0x17 ; Graphics mode setting address -@let vt_sprite_mem 0x18 ; Sprite memory address -@let vt_text_mem 0x19 ; Text memory buffer address - ; memory segments @let stack_segment 0x8000 @let mmio_segment 0xE000 @@ -29,8 +16,21 @@ @let gr_text_mode 0b01 @let gr_sprite_mode 0b10 +; vector table fields +@let vector_table 0x10 +@let vt_ISR0 0x10 ; ISR0 +@let vt_ISR1 0x11 ; ISR1 +@let vt_ISR2 0x12 ; ISR2 +@let vt_ISR3 0x13 ; ISR3 +@let vt_stack_addr 0x14 ; Stack address +@let vt_term_pp_addr 0x15 ; Terminal peripheral address +@let vt_kb_pp_addr 0x16 ; Keyboard peripheral address +@let vt_gr_mode_addr 0x17 ; Graphics mode setting address +@let vt_sprite_mem 0x18 ; Sprite memory address +@let vt_text_mem 0x19 ; Text memory buffer address + @address vector_table - keyboard_isr ; 0x10 + hlt_isr ; 0x10 hlt_isr ; 0x11 hlt_isr ; 0x12 hlt_isr ; 0x13 @@ -45,19 +45,21 @@ ldi 0x55 RE hlt -@label keyboard_isr - spu RA - spu RB - ldi vt_kb_pp_addr RA ; RA := Keyboard peripheral address pointer - ldr RA RA ; RA := Keyboard peripheral address deref - ldr RA RA ; RA := <16-bit keyboard character code> from MMIO register - ldi vt_term_pp_addr RB ; RB := Terminal peripheral address pointer - ldr RB RB ; RB := Terminal peripheral address deref - str RA RB ; terminal <- character code (ASCII?) - mov RA RE ; RE := character code (for debugging) - spo RB - spo RA - rti +; Example ISR for keyboard to terminal +; @label keyboard_to_terminal_isr +; spu RA +; spu RB +; ldi vt_kb_pp_addr RA ; RA := Keyboard peripheral address pointer +; ldr RA RA ; RA := Keyboard peripheral address deref +; ldr RA RA ; RA := <16-bit keyboard character code> from MMIO register +; ldi vt_term_pp_addr RB ; RB := Terminal peripheral address pointer +; ldr RB RB ; RB := Terminal peripheral address deref +; str RA RB ; terminal <- character code (ASCII?) +; mov RA RE ; RE := character code (for debugging) +; spo RB +; spo RA +; rti + @label program_segment ; define short prelude that sets up vital instructions |