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

arm9/source/patches/platform/ezp/EzpReadSdDataPatchCode.s

@@ -0,0 +1,66 @@
+.cpu arm7tdmi
+.section "ezp_readsddata", "ax"
+.syntax unified
+.thumb
+
+// r0 = src sector
+// r1 = dst
+// r2 = sector count
+// r3 = sector count for single read
+.global ezp_readSdData
+.type ezp_readSdData, %function
+ezp_readSdData:
+    push {r4-r7,lr}
+    ldr r4, =0x040001A0
+
+    // Setup command for data read
+    // BA 00 00 00 00 00 00 00
+    movs r7, #0xBA
+    str r7, [r4,#0x8]
+    movs r7, #0
+    str r7, [r4,#0xC]
+
+    // Set up MCCNT for required read size
+    adr r6, readLengthControlValues
+    lsls r7, r3, #2
+    ldr r5, [r6,r7]
+    str r5, [r4,#4]
+
+    ldr r6, =0x04100010
+
+    // Get number of words to read
+    // 1 sector == 128 words
+    lsls r3, r3, #7
+
+BA_data_loop:
+    ldrb r7, [r4,#6]
+    lsrs r7, r7, #8 // check if data is ready
+    bcc BA_data_loop_check_transfer_end // if not skip reading
+
+    ldr r7, [r6]
+    // Check if the read word needs to be stored.
+    cmp r3, #0
+    // If we already read all the needed words, skip
+    beq BA_data_loop_check_transfer_end
+    subs r3, r3, #1
+    stmia r1!, {r7}
+
+BA_data_loop_check_transfer_end:
+    ldrb r7, [r4,#7]
+    lsrs r7, r7, #8 // check if transfer is done
+    bcs BA_data_loop
+
+    pop {r4-r7,pc}
+
+.balign 4
+
+readLengthControlValues:
+    .word 0
+    .word 0xA15A6000
+    .word 0xA25A6000
+    .word 0xA35A6000
+    .word 0xA35A6000
+
+.pool
+
+.end