From 5fc1bfd456110a1325329f6646a7b316fb98e2a8 Mon Sep 17 00:00:00 2001
From: ApacheThunder <spenserwhaley@gmail.com>
Date: Sat, 14 Dec 2024 16:17:18 -0600
Subject: [PATCH] Add 32KB DLDI support.

* dldi_32K.s added. Overrides libnds's version with one that reserves
32KB instead of 16KB.
---
 arm9/source/dldi_32K.s | 100 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 arm9/source/dldi_32K.s

diff --git a/arm9/source/dldi_32K.s b/arm9/source/dldi_32K.s
new file mode 100644
index 0000000..4fd3d56
--- /dev/null
+++ b/arm9/source/dldi_32K.s
@@ -0,0 +1,100 @@
+/*---------------------------------------------------------------------------------
+
+  Copyright (C) 2006 - 2016
+    Michael Chisholm (Chishm)
+    Dave Murphy (WinterMute)
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any
+  damages arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any
+  purpose, including commercial applications, and to alter it and
+  redistribute it freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you
+     must not claim that you wrote the original software. If you use
+     this software in a product, an acknowledgment in the product
+     documentation would be appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and
+     must not be misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source
+     distribution.
+
+---------------------------------------------------------------------------------*/
+
+#include <nds/arm9/dldi_asm.h>
+
+	.align	4
+	.arm
+	.global _io_dldi_stub
+@---------------------------------------------------------------------------------
+
+.equ DLDI_ALLOCATED_SPACE,		32768
+
+_io_dldi_stub:
+
+dldi_start:
+
+@---------------------------------------------------------------------------------
+@ Driver patch file standard header -- 16 bytes
+	.word	0xBF8DA5ED		@ Magic number to identify this region
+	.asciz	" Chishm"		@ Identifying Magic string (8 bytes with null terminator)
+	.byte	0x01			@ Version number
+	.byte	DLDI_SIZE_32KB	@32KiB	@ Log [base-2] of the size of this driver in bytes.
+	.byte	0x00			@ Sections to fix
+	.byte 	DLDI_SIZE_32KB	@32KiB	@ Log [base-2] of the allocated space in bytes.
+	
+@---------------------------------------------------------------------------------
+@ Text identifier - can be anything up to 47 chars + terminating null -- 16 bytes
+	.align	4
+	.asciz "Default (No interface)"
+
+@---------------------------------------------------------------------------------
+@ Offsets to important sections within the data	-- 32 bytes
+	.align	6
+	.word   dldi_start		@ data start
+	.word   dldi_end		@ data end
+	.word	0x00000000		@ Interworking glue start	-- Needs address fixing
+	.word	0x00000000		@ Interworking glue end
+	.word   0x00000000		@ GOT start					-- Needs address fixing
+	.word   0x00000000		@ GOT end
+	.word   0x00000000		@ bss start					-- Needs setting to zero
+	.word   0x00000000		@ bss end
+
+@---------------------------------------------------------------------------------
+@ DISC_INTERFACE data -- 32 bytes
+	.ascii	"DLDI"				@ ioType
+	.word	0x00000000			@ Features
+	.word	_DLDI_startup			@ 
+	.word	_DLDI_isInserted		@ 
+	.word	_DLDI_readSectors		@   Function pointers to standard device driver functions
+	.word	_DLDI_writeSectors		@ 
+	.word	_DLDI_clearStatus		@ 
+	.word	_DLDI_shutdown			@ 
+	
+@---------------------------------------------------------------------------------
+
+_DLDI_startup:
+_DLDI_isInserted:
+_DLDI_readSectors:
+_DLDI_writeSectors:
+_DLDI_clearStatus:
+_DLDI_shutdown:
+	mov		r0, #0x00				@ Return false for every function
+	bx		lr
+
+
+
+@---------------------------------------------------------------------------------
+	.align
+	.pool
+
+dldi_data_end:
+
+@ Pad to end of allocated space
+.space DLDI_ALLOCATED_SPACE - (dldi_data_end - dldi_start)	
+
+dldi_end:
+	.end
+@---------------------------------------------------------------------------------