Refactored platform code to use interfaces for patch code with a special feature and improved patch code file names

arm9/source/patches/platform/ak2/Ak2ReadSdPatchCode.s

@@ -0,0 +1,69 @@
+.cpu arm7tdmi
+.syntax unified
+.section "ak2_readsd", "ax"
+.thumb
+
+// r0 = src sector
+// r1 = dst
+// r2 = sector count
+.global ak2_readSd
+.type ak2_readSd, %function
+ak2_readSd:
+    push {r4,lr}
+
+    ldr r4, =0x040001A0
+    movs r3, #0x80
+    strb r3, [r4,#1]
+
+.global ak2_readSd_sdsc_shift
+ak2_readSd_sdsc_shift:
+    lsls r4, r0, #9
+
+    push {r0-r1}
+
+    ldr r0, =0x120004D5
+    movs r1, r4
+    ldr r3, ak2_readSd_sendSdioCommand_address
+    bl blx_r3
+
+    // Wait for SD state
+    movs r0, #4
+    movs r1, #7
+    ldr r3, ak2_readSd_sdWaitForState_address
+    bl blx_r3
+
+    pop {r0-r1}
+
+    // Read sectors. Parameters identical to readSd
+    ldr r3, ak2_readSd_sdReadSector_address
+    bl blx_r3
+
+    // Send CMD12 == STOP_TRANSMISSION
+    push {r0-r1}
+    ldr r0, =0x0C0001D5
+    movs r1, #0
+    ldr r3, ak2_readSd_sendSdioCommand_address
+    bl blx_r3
+
+    pop {r0-r1,r4,pc}
+
+blx_r3:
+    bx r3
+
+.balign 4
+
+.global ak2_readSd_sendSdioCommand_address
+ak2_readSd_sendSdioCommand_address:
+    .word 0
+
+.global ak2_readSd_sdReadSector_address
+ak2_readSd_sdReadSector_address:
+    .word 0
+
+.global ak2_readSd_sdWaitForState_address
+ak2_readSd_sdWaitForState_address:
+    .word 0
+
+.pool
+
+.end