Patch checksum AP in Last Window: The Secret of Cape West (#104)

arm9/source/patches/arm9/LastWindowCrcPatchCode.s

@@ -0,0 +1,30 @@
+.cpu arm946e-s
+.section "patch_lastwindowcrc", "ax"
+.syntax unified
+
+.thumb
+.global patch_lastwindowcrc_entry
+.type patch_lastwindowcrc_entry, %function
+patch_lastwindowcrc_entry:
+    // r0=crc_start, r1=datap, r2=size
+    ldr r3, =0x0207D4F4 // CRC of DS Protect region
+    cmp r1, r3
+    beq crc_dsprotect
+
+    ldr r3, =0x0202DB34 // CRC of other code region (unknown)
+    cmp r1, r3
+    beq crc_unk
+
+    swi #0xE // Normal CRC if address does not match (never hit?)
+    bx lr
+
+crc_dsprotect:
+    ldr r0, =0x67D7
+    bx lr
+
+crc_unk:
+    ldr r0, =0x0D1E
+    bx lr
+
+.pool
+.end