From 5ee501eec5820830d396ff1b7d27d4f937fd806e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Markus=20Fr=C3=B6schle?= <mfro@mubf.de>
Date: Sat, 7 Dec 2019 18:43:38 +0100
Subject: [PATCH] initial import

---
 .gitignore |  4 ++++
 Makefile   | 44 ++++++++++++++++++++++++++++++++++++++++++++
 startup.S  | 22 ++++++++++++++++++++++
 strb_inv.c | 30 ++++++++++++++++++++++++++++++
 4 files changed, 100 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 startup.S
 create mode 100644 strb_inv.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3ffa79d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+depend
+*.prg
+*.o
+
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..4b04e7f
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,44 @@
+# 
+
+TOOLCHAIN_PREFIX=m68k-atari-mint-
+CC=$(TOOLCHAIN_PREFIX)gcc
+
+UNAME := $(shell uname)
+ifeq ($(UNAME),Linux)
+PREFIX=m68k-atari-mint
+HATARI=hatari
+else
+PREFIX=/opt/cross-mint/m68k-atari-mint
+HATARI=/usr/local/bin/hatari
+endif
+
+CFLAGS= \
+	-Os\
+	-fomit-frame-pointer\
+    -mcpu=547x\
+	-Wall\
+	-mshort\
+	-nostdlib
+	
+APP=strb_inv.prg
+
+all: $(APP) 
+
+SOURCES=startup.S strb_inv.c
+		
+OBJECTS=$(SOURCES:.c=.o)
+
+$(APP): $(OBJECTS) depend
+	$(CC) $(CFLAGS) $(OBJECTS) -o $(APP) -lgcc
+	m68k-atari-mint-strip $(APP)
+		
+.PHONY clean:
+	- rm -rf *.o depend strb_inv.prg
+
+depend: $(SOURCES)
+		$(CC) $(CFLAGS) $(INCLUDE) -M $(SOURCES) strb_inv.c > depend
+
+	
+ifneq (clean,$(MAKECMDGOALS))
+-include depend
+endif
diff --git a/startup.S b/startup.S
new file mode 100644
index 0000000..0dfe99c
--- /dev/null
+++ b/startup.S
@@ -0,0 +1,22 @@
+		.extern	_main
+		.globl 	_program_length
+
+ 		.equ 	BASEPAGE_SIZE,0x100
+		
+		.text
+
+start:
+		move.l	4(sp),a5					| address to basepage
+		move.l	0x0c(a5),d0					| length of text segment
+		add.l	0x14(a5),d0					| length of data segment
+		add.l	0x1c(a5),d0					| length of bss segment
+		add.l	#BASEPAGE_SIZE,d0			| length of stackpointer+basepage
+		move.l	d0,_program_length			| save program length so _main() can access it
+	
+		jsr	_main							| make sure we never return here
+
+		.bss
+		
+_program_length:
+		ds.l	1
+
diff --git a/strb_inv.c b/strb_inv.c
new file mode 100644
index 0000000..338c7d8
--- /dev/null
+++ b/strb_inv.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <osbind.h>
+#include <mint/ostruct.h>
+#include <mint/sysvars.h>
+
+
+void __main(void)
+{
+	;
+}
+
+volatile long *acp_config = (volatile long *) 0xff040000;
+
+void inv_strb(void)
+{
+    (void) Cconws("ACP_CONFIG(0)=");
+    (void) Cconws(*acp_config & 1 ? "1" : "0");
+    (void) Cconws("\r\n");
+    *acp_config ^= 1;
+    (void) Cconws("ACP_CONFIG(0)=");
+    (void) Cconws(*acp_config & 1 ? "1" : "0");
+    (void) Cconws("\r\n");
+}
+
+int main(int argc, char *argv[])
+{
+    Supexec(inv_strb);
+    Pterm0();
+}