ARM: Add secure section for initialized data

The secure monitor may need to store global or static values within the
secure section of memory, such as target PC or CPU power status.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

arch/arm/config.mk

@@ -120,8 +120,8 @@ endif
 ifdef CONFIG_ARM64
 OBJCOPYFLAGS += -j .text -j .rodata -j .data -j .u_boot_list -j .rela.dyn
 else
-OBJCOPYFLAGS += -j .text -j .secure_text -j .rodata -j .hash -j .data -j \
-	.got -j .got.plt -j .u_boot_list -j .rel.dyn
+OBJCOPYFLAGS += -j .text -j .secure_text -j .secure_data -j .rodata -j .hash \
+		-j .data -j .got -j .got.plt -j .u_boot_list -j .rel.dyn
 endif
 
 ifdef CONFIG_OF_EMBED

arch/arm/cpu/u-boot.lds

@@ -69,12 +69,17 @@ SECTIONS
 		*(._secure.text)
 	}
 
-	.secure_stack ALIGN(ADDR(.secure_text) + SIZEOF(.secure_text),
+	.secure_data : AT(LOADADDR(.secure_text) + SIZEOF(.secure_text))
+	{
+		*(._secure.data)
+	}
+
+	.secure_stack ALIGN(ADDR(.secure_data) + SIZEOF(.secure_data),
 			    CONSTANT(COMMONPAGESIZE)) (NOLOAD) :
 #ifdef __ARMV7_PSCI_STACK_IN_RAM
 		AT(ADDR(.secure_stack))
 #else
-		AT(LOADADDR(.secure_text) + SIZEOF(.secure_text))
+		AT(LOADADDR(.secure_data) + SIZEOF(.secure_data))
 #endif
 	{
 		KEEP(*(.__secure_stack_start))

arch/arm/include/asm/secure.h

@@ -4,6 +4,7 @@
 #include <config.h>
 
 #define __secure __attribute__ ((section ("._secure.text")))
+#define __secure_data __attribute__ ((section ("._secure.data")))
 
 #ifdef CONFIG_ARMV7_SECURE_BASE
 /*