[PATCH v2 7/8] ARM: mmu-early: map no-map entries XN & uncached

[Rouven Czerwinski]

Ensure that reserved map entries with the no-map flag are marked as
uncached and non-execute during the early MMU initialization.

Signed-off-by: Rouven Czerwinski <r.czerwinski at pengutronix.de>
---
 arch/arm/cpu/mmu-early.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm/cpu/mmu-early.c b/arch/arm/cpu/mmu-early.c
index b985aa455f..9c3f01326b 100644
--- a/arch/arm/cpu/mmu-early.c
+++ b/arch/arm/cpu/mmu-early.c
@@ -3,9 +3,11 @@
 #include <errno.h>
 #include <linux/sizes.h>
 #include <asm/memory.h>
+#include <asm-generic/memory_layout.h>
 #include <asm/system.h>
 #include <asm/cache.h>
 #include <asm-generic/sections.h>
+#include <pbl.h>
 
 #include "mmu.h"
 
@@ -24,7 +26,10 @@ static inline void map_region(unsigned long start, unsigned long size,
 void mmu_early_enable(unsigned long membase, unsigned long memsize,
 		      unsigned long _ttb)
 {
+	const struct pbl_reserved_memory *res_mem;
+	int i;
 	ttb = (uint32_t *)_ttb;
+	res_mem =  get_pbl_reserved_memory();
 
 	arm_set_cache_functions();
 
@@ -58,6 +63,14 @@ void mmu_early_enable(unsigned long membase, unsigned long memsize,
 	/* maps main memory as cachable */
 	map_region(membase, memsize, PMD_SECT_DEF_CACHED);
 
+	for (i = 0; i < get_pbl_reserved_memory_num(); i++) {
+		if (res_mem->flags & FDT_RES_MEM_FLAG_NOMAP)
+			map_region(res_mem->base, res_mem->size,
+				   PMD_SECT_DEF_UNCACHED | PMD_SECT_XN);
+		res_mem++;
+	}
+
+
 	/*
 	 * With HAB enabled we call into the ROM code later in imx6_hab_get_status().
 	 * Map the ROM cached which has the effect that the XN bit is not set.
-- 
2.32.0