megadrive_test2
annotate src/intr.s @ 6:df2c6b3c6f2e
added NTSC/PAL detection
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Wed, 21 Jun 2017 06:32:10 +0300 |
| parents | 72ab63f262bf |
| children |
| rev | line source |
|---|---|
| nuclear@4 | 1 | vi:filetype=gas68k: |
| nuclear@0 | 2 | the following will go into the .vect section which will be placed at the very |
| nuclear@0 | 3 | begining of the binary at address 0 by the linker (see lnkscript). |
| nuclear@0 | 4 .section .vect,"a" |
| nuclear@0 | 5 .extern start |
| nuclear@0 | 6 | exception vectors |
| nuclear@0 | 7 .long _stacktop | 00 reset - initial SSP |
| nuclear@0 | 8 .long start | 01 reset - initial PC |
| nuclear@0 | 9 .long intr_fatal | 02 bus error |
| nuclear@0 | 10 .long intr_fatal | 03 address error |
| nuclear@0 | 11 .long intr_fatal | 04 illegal instruction |
| nuclear@0 | 12 .long intr_fatal | 05 zero divide |
| nuclear@0 | 13 .long intr_fatal | 06 chk instruction |
| nuclear@0 | 14 .long intr_fatal | 07 trapv instruction |
| nuclear@0 | 15 .long intr_fatal | 08 privilege violation |
| nuclear@0 | 16 .long intr_fatal | 09 trace |
| nuclear@0 | 17 .long intr_fatal | 0a line 1010 emulator |
| nuclear@0 | 18 .long intr_fatal | 0b line 1111 emulator |
| nuclear@0 | 19 .long intr_fatal | 0c reserved |
| nuclear@0 | 20 .long intr_fatal | 0d reserved |
| nuclear@0 | 21 .long intr_fatal | 0e format error (mc68010 only) |
| nuclear@0 | 22 .long intr_fatal | 0f uninitialized interrupt vector |
| nuclear@0 | 23 .long intr_fatal | 10 \ |
| nuclear@0 | 24 .long intr_fatal | 11 | |
| nuclear@0 | 25 .long intr_fatal | 12 | |
| nuclear@0 | 26 .long intr_fatal | 13 > reserved |
| nuclear@0 | 27 .long intr_fatal | 14 | |
| nuclear@0 | 28 .long intr_fatal | 15 | |
| nuclear@0 | 29 .long intr_fatal | 16 | |
| nuclear@0 | 30 .long intr_fatal | 17 / |
| nuclear@0 | 31 .long intr_fatal | 18 spurious interrupt |
| nuclear@0 | 32 .long intr_fatal | 19 level 1 interrupt |
| nuclear@0 | 33 .long intr_fatal | 1a level 2 interrupt |
| nuclear@0 | 34 .long intr_fatal | 1b level 3 interrupt |
| nuclear@0 | 35 .long intr_hblank | 1c level 4 interrupt (hblank in the mega drive) |
| nuclear@0 | 36 .long intr_fatal | 1d level 5 interrupt |
| nuclear@0 | 37 .long intr_vblank | 1e level 6 interrupt (vblank in the mega drive) |
| nuclear@0 | 38 .long intr_fatal | 1f level 7 interrupt |
| nuclear@0 | 39 .long intr_fatal | 20 trap 0 |
| nuclear@0 | 40 .long intr_fatal | 21 trap 1 |
| nuclear@0 | 41 .long intr_fatal | 22 trap 2 |
| nuclear@0 | 42 .long intr_fatal | 23 trap 3 |
| nuclear@0 | 43 .long intr_fatal | 24 trap 4 |
| nuclear@0 | 44 .long intr_fatal | 25 trap 5 |
| nuclear@0 | 45 .long intr_fatal | 26 trap 6 |
| nuclear@0 | 46 .long intr_fatal | 27 trap 7 |
| nuclear@0 | 47 .long intr_fatal | 28 trap 8 |
| nuclear@0 | 48 .long intr_fatal | 29 trap 9 |
| nuclear@0 | 49 .long intr_fatal | 2a trap a |
| nuclear@0 | 50 .long intr_fatal | 2b trap b |
| nuclear@0 | 51 .long intr_fatal | 2c trap c |
| nuclear@0 | 52 .long intr_fatal | 2d trap d |
| nuclear@0 | 53 .long intr_fatal | 2e trap e |
| nuclear@0 | 54 .long intr_fatal | 2f trap f |
| nuclear@0 | 55 .long intr_fatal | 30 \ |
| nuclear@0 | 56 .long intr_fatal | 31 | |
| nuclear@0 | 57 .long intr_fatal | 32 | |
| nuclear@0 | 58 .long intr_fatal | 33 | |
| nuclear@0 | 59 .long intr_fatal | 34 | |
| nuclear@0 | 60 .long intr_fatal | 35 | |
| nuclear@0 | 61 .long intr_fatal | 36 | |
| nuclear@0 | 62 .long intr_fatal | 37 | |
| nuclear@0 | 63 .long intr_fatal | 38 > reserved |
| nuclear@0 | 64 .long intr_fatal | 39 | |
| nuclear@0 | 65 .long intr_fatal | 3a | |
| nuclear@0 | 66 .long intr_fatal | 3b | |
| nuclear@0 | 67 .long intr_fatal | 3c | |
| nuclear@0 | 68 .long intr_fatal | 3d | |
| nuclear@0 | 69 .long intr_fatal | 3e | |
| nuclear@0 | 70 .long intr_fatal | 3f / |
| nuclear@0 | 71 |
| nuclear@0 | 72 | from here on we continue in the regular .text section since we don't care |
| nuclear@0 | 73 | where this code ends up. |
| nuclear@0 | 74 .text |
| nuclear@1 | 75 |
| nuclear@1 | 76 .global enable_intr |
| nuclear@1 | 77 enable_intr: |
| nuclear@1 | 78 andi.w #0xf8ff, %sr |
| nuclear@1 | 79 rts |
| nuclear@1 | 80 |
| nuclear@1 | 81 .global disable_intr |
| nuclear@1 | 82 disable_intr: |
| nuclear@1 | 83 ori.w #0x0300, %sr |
| nuclear@1 | 84 rts |
| nuclear@1 | 85 |
| nuclear@0 | 86 | interrupt handlers |
| nuclear@0 | 87 intr_fatal: |
| nuclear@0 | 88 stop #0x2700 |
| nuclear@0 | 89 |
| nuclear@1 | 90 .include "vdpdefs.inc" |
| nuclear@1 | 91 .extern vblank_handler |
| nuclear@1 | 92 .extern palval |
| nuclear@1 | 93 |
| nuclear@0 | 94 intr_hblank: |
| nuclear@4 | 95 | move.l #0xc0020000, VDP_PORT_CTL |
| nuclear@4 | 96 | |
| nuclear@4 | 97 | move.w testcol, %d0 |
| nuclear@4 | 98 | move.w %d0, VDP_PORT_DATA |
| nuclear@4 | 99 | rol.b #4, %d0 |
| nuclear@4 | 100 | move.w %d0, testcol |
| nuclear@4 | 101 | |
| nuclear@0 | 102 rte |
| nuclear@1 | 103 |
| nuclear@0 | 104 intr_vblank: |
| nuclear@5 | 105 jsr vblank_handler |
| nuclear@0 | 106 rte |