From 04548126b5c430356a723e30ba222ff4b874fad0 Mon Sep 17 00:00:00 2001
From: tcsullivan <tullivan99@gmail.com>
Date: Tue, 25 Sep 2018 17:09:53 -0400
Subject: began work to add privilege

---
 include/priv_gpio.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 include/priv_gpio.h

(limited to 'include')

diff --git a/include/priv_gpio.h b/include/priv_gpio.h
new file mode 100644
index 0000000..eee5e18
--- /dev/null
+++ b/include/priv_gpio.h
@@ -0,0 +1,26 @@
+#ifndef PRIV_GPIO_H_
+#define PRIV_GPIO_H_
+
+#define GPIO_MODE 0
+#define GPIO_TYPE 1
+#define GPIO_PUPD 2
+#define GPIO_SPEED 3
+#define GPIO_OUT 4
+
+void gpio(uint32_t call, uint32_t port, uint32_t pin, uint32_t value) 
+{
+	register uint32_t r0 asm("r0") = call;
+	register uint32_t r1 asm("r1") = port;
+	register uint32_t r2 asm("r2") = pin;
+	register uint32_t r3 asm("r3") = value;
+
+	asm("\
+		mov r0, %0; \
+		mov r1, %1; \
+		mov r2, %2; \
+		mov r3, %3; \
+		svc 1; \
+	" :: "r" (r0), "r" (r1), "r" (r2), "r" (r3));
+}
+
+#endif // PRIV_GPIO_H_
-- 
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