hexed: relocation and test stub

some old uncommited code

diff --git a/hexed/hexed.s b/hexed/hexed.s
index e2568ad..2152aa8 100644 (file)
--- a/hexed/hexed.s
+++ b/hexed/hexed.s
@@ -29,8 +29,9 @@
 #   --register-prefix-optional --bitwise-or
 #
 
-.equ USE_VINT,        1
-.equ RELOCATE_TO_RAM, 0
+.equ USE_VINT,        0
+.equ COPY_TO_EXP,     1
+.equ RELOCATE_TO_RAM, 1
 
 .text
 .globl main
@@ -267,7 +268,7 @@ main:
        /* mask irqs during init */
        move.w          #0x2700,sr
 
-.if 0
+.if COPY_TO_EXP
        /* copy to expansion device if magic number is set */
        move.l          #0x400000,a1
        cmp.w           #0x1234,(a1)
@@ -283,8 +284,13 @@ main:
 .endif
 
 .if RELOCATE_TO_RAM
+       /* we could be relocated by 32x or something else, adjust start addr */
+       lea             (pc),a0
+       move.l          a0,d0
+       and.l           #0xff0000,d0
+       move.l          d0,a0
+
        /* copy, assume 8K size */
-       move.l          #0,a0
        move.l          #0xFF0100,a1
        move.w          #0x2000/8-1,d0
 1:
@@ -292,8 +298,25 @@ main:
        move.l          (a0)+,(a1)+
        dbra            d0,1b
 
+       /* copy test code */
+       lea             (test_code,pc),a0
+       move.l          #0xffc000,a1
+       move.w          #(test_code_end - test_code)/2-1,d0
+1:
+       move.w          (a0)+,(a1)+
+       dbra            d0,1b
+
        lea             (0f,pc),a0
-       add.l           #0xFF0100,a0
+       move.l          a0,d0
+       and.l           #0x00ffff,d0
+       add.l           #0xFF0100,d0
+       move.l          d0,a0
+
+       /* patch test code */
+       move.l          #0xffc000,a1
+       add.w           #(test_code_ret_op-test_code+2),a1
+       move.l          a0,(a1)
+
        jmp             (a0)
 0:
 .endif
@@ -1629,6 +1652,22 @@ wait_vsync_poll:
        rts
 
 
+test_code:
+       move.w          #3, (0xa15100)  /* adapter enable, reset off */
+       nop
+       nop
+       move.w          #1, (0xa15180)  /* mode 1 */
+       movea.l         #0xa15200, a0
+       move.l          #256-1, d0
+0:
+       move.w          #0,(a0)+
+       dbra            d0,0b
+       move.w          #0x83e0, (0xa15200) /* color 0 */
+
+test_code_ret_op:
+       jmp     0x123456        /* will be patched */
+test_code_end:
+
 #################################################
 #                                               #
 #                 RAM DATA                      #