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.macro switch32bitmode
/* is a 32bit aware ROM ? */
movea.l ROMBase,%a0
move.w 8(%a0), %d1 /* read ROM id */
cmp.w #0x0178, %d1 /* only 24bit ROM */
bls.S bit32_ok
/* is a 32bit aware processor ? */
cmp.w #1, CPUFlags /* Is 68000 or 68010 */
bls.S bit32_ok
/* test if we are in 32bit mode */
move.l #-1, %d0
StripAddress
cmp.l #-1, %d0
beq.S bit32_ok
/* Switch to 32bit mode */
lea PRAM_buffer(%pc), %a0 /* where to store data */
move.w #1, %d0 /* size of data */
swap %d0
move.w #0x08A, %d0 /* offset in PRAM */
ReadXPRam
lea PRAM_buffer(%pc), %a0
or.b #0x05, (%a0)
move.w #1, %d0 /* size of data */
swap %d0
move.w #0x08A, %d0 /* offset in PRAM */
WriteXPRam
/* jump to reset function in ROM */
movea.l ROMBase,%a0
jmp 0x90(%a0)
bit32_ok:
.endm
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