Add TrustZone (TZC-400) driver

The TZC-400 performs security checks on transactions to memory or
peripherals. Separate regions can be created in the address space each
with individual security settings.

Limitations:
This driver does not currently support raising an interrupt on access
violation.

Change-Id: Idf8ed64b4d8d218fc9b6f9d75acdb2cd441d2449

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/mmio.c b/lib/mmio.c
index b654be77..1350609a 100644
--- a/lib/mmio.c
+++ b/lib/mmio.c
@@ -30,6 +30,16 @@
 
 #include <stdint.h>
 
+void mmio_write_8(uintptr_t addr, uint8_t value)
+{
+	*(volatile uint8_t*)addr = value;
+}
+
+uint8_t mmio_read_8(uintptr_t addr)
+{
+	return *(volatile uint8_t*)addr;
+}
+
 void mmio_write_32(uintptr_t addr, uint32_t value)
 {
 	*(volatile uint32_t*)addr = value;