armv8: New MMU setup code allowing to use 48+ bits PA/VA
This patch adds code which sets up 2-level page tables on ARM64 thus
extending available VA space. CPUs implementing 64k translation
granule are able to use direct PA-VA mapping of the whole 48 bit
address space.
It also adds the ability to reset the SCTRL register at the very beginning
of execution to avoid interference from stale mappings set up by early
firmware/loaders/etc.
Signed-off-by: Sergey Temerkhanov <s.temerkhanov@gmail.com>
Signed-off-by: Radha Mohan Chintakuntla <rchintakuntla@cavium.com>
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 5d66fa0..393e7af 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -14,7 +14,12 @@
#define CR_WXN (1 << 19) /* Write Permision Imply XN */
#define CR_EE (1 << 25) /* Exception (Big) Endian */
+#ifndef CONFIG_SYS_FULL_VA
#define PGTABLE_SIZE (0x10000)
+#else
+#define PGTABLE_SIZE CONFIG_SYS_PGTABLE_SIZE
+#endif
+
/* 2MB granularity */
#define MMU_SECTION_SHIFT 21
#define MMU_SECTION_SIZE (1 << MMU_SECTION_SHIFT)
@@ -148,7 +153,9 @@
#define CR_AFE (1 << 29) /* Access flag enable */
#define CR_TE (1 << 30) /* Thumb exception enable */
+#ifndef PGTABLE_SIZE
#define PGTABLE_SIZE (4096 * 4)
+#endif
/*
* This is used to ensure the compiler did actually allocate the register we