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

arm9/source/patches/platform/g003/G003WriteSdPatchCode.s

@@ -0,0 +1,87 @@
+.cpu arm7tdmi
+.section "g003_writesd", "ax"
+.syntax unified
+.thumb
+
+// r0 = dst sector
+// r1 = src
+// r2 = sector count
+.global g003_writeSd
+.type g003_writeSd, %function
+g003_writeSd:
+    push {r4-r7,lr}
+
+    ldr r4, =0x040001A0
+    movs r3, #0x80
+    strb r3, [r4,#1]
+
+sector_loop:
+    // write at sd sector, sector << 1 == 0xaabbccdd
+    // C5 bb cc dd 00 00 00 aa
+
+    // left shift sector address 1
+    lsls r7, r0, #1
+
+    // start copy to MCCMD1
+    movs r3, #0xC5
+    strb r3, [r4,#0x8]
+    lsrs r3, r7, #24
+    strb r3, [r4,#0xF] // place MSByte of sector address at end of command instead
+    lsrs r3, r7, #16
+    strb r3, [r4,#0x9]
+    lsrs r3, r7, #8
+    strb r3, [r4,#0xA]
+    // Ace3DS+ code uses str, but G003 doesn't store the last byte at u8 MCCMD1[4].
+    // So we use strb just like the other bytes.
+    strb r7, [r4,#0xB]
+
+    ldr r6, =0x04100010
+
+    ldr r3, =0xE1586000
+    str r3, [r4,#4]
+
+C5_data_loop:
+    ldrb r3, [r4,#6]
+    lsrs r3, r3, #8 // check if ready to write
+    bcc C5_data_loop_check_transfer_end // if not skip reading
+    
+    ldmia r1!, {r3}
+    str r3, [r6]
+
+C5_data_loop_check_transfer_end:
+    ldrb r3, [r4,#7]
+    lsrs r3, r3, #8 // check if transfer is done
+    bcs C5_data_loop
+
+    movs r3, #0xC6
+    strb r3, [r4,#0x8]
+
+C6_poll_loop:
+    ldr r3, =0xA7586000
+    str r3, [r4,#4]
+
+C6_poll_transfer_loop:
+    ldrb r3, [r4,#6]
+    lsrs r3, r3, #8
+    bcc C6_poll_check_transfer_end
+    ldr r5, [r6]
+
+C6_poll_check_transfer_end:
+    ldrb r3, [r4,#7]
+    lsrs r3, r3, #8
+    bcs C6_poll_transfer_loop
+
+    cmp r5, #0
+    bne C6_poll_loop
+
+    adds r0, #1
+    subs r2, #1
+    bne sector_loop
+
+    pop {r4-r7,pc}
+
+.balign 4
+
+.pool
+
+.end