Automatically select initial xlation lookup level
Instead of hardcoding a level 1 table as the base translation level
table, let the code decide which level is the most appropriate given
the virtual address space size.
As the table granularity is 4 KB, this allows the code to select
level 0, 1 or 2 as base level for AArch64. This way, instead of
limiting the virtual address space width to 39-31 bits, widths of
48-25 bit can be used.
For AArch32, this change allows the code to select level 1 or 2
as the base translation level table and use virtual address space
width of 32-25 bits.
Also removed some unused definitions related to translation tables.
Fixes ARM-software/tf-issues#362
Change-Id: Ie3bb5d6d1a4730a26700b09827c79f37ca3cdb65
diff --git a/include/lib/xlat_tables.h b/include/lib/xlat_tables.h
index 3f35e45..d2ac6db 100644
--- a/include/lib/xlat_tables.h
+++ b/include/lib/xlat_tables.h
@@ -32,29 +32,12 @@
#define __XLAT_TABLES_H__
/* Miscellaneous MMU related constants */
-#define NUM_2MB_IN_GB (1 << 9)
-#define NUM_4K_IN_2MB (1 << 9)
-#define NUM_GB_IN_4GB (1 << 2)
-
-#define TWO_MB_SHIFT 21
-#define ONE_GB_SHIFT 30
#define FOUR_KB_SHIFT 12
-#define ONE_GB_INDEX(x) ((x) >> ONE_GB_SHIFT)
-#define TWO_MB_INDEX(x) ((x) >> TWO_MB_SHIFT)
-#define FOUR_KB_INDEX(x) ((x) >> FOUR_KB_SHIFT)
-
#define INVALID_DESC 0x0
-#define BLOCK_DESC 0x1
-#define TABLE_DESC 0x3
-
-#define FIRST_LEVEL_DESC_N ONE_GB_SHIFT
-#define SECOND_LEVEL_DESC_N TWO_MB_SHIFT
-#define THIRD_LEVEL_DESC_N FOUR_KB_SHIFT
-
-#define LEVEL1 1
-#define LEVEL2 2
-#define LEVEL3 3
+#define BLOCK_DESC 0x1 /* Table levels 0-2 */
+#define TABLE_DESC 0x3 /* Table levels 0-2 */
+#define PAGE_DESC 0x3 /* Table level 3 */
#define XN (1ull << 2)
#define PXN (1ull << 1)
@@ -78,6 +61,14 @@
#define XLAT_TABLE_SIZE_SHIFT PAGE_SIZE_SHIFT
#define XLAT_TABLE_SIZE (1 << XLAT_TABLE_SIZE_SHIFT)
+#ifdef AARCH32
+#define XLAT_TABLE_LEVEL_MIN 1
+#else
+#define XLAT_TABLE_LEVEL_MIN 0
+#endif /* AARCH32 */
+
+#define XLAT_TABLE_LEVEL_MAX 3
+
/* Values for number of entries in each MMU translation table */
#define XLAT_TABLE_ENTRIES_SHIFT (XLAT_TABLE_SIZE_SHIFT - XLAT_ENTRY_SIZE_SHIFT)
#define XLAT_TABLE_ENTRIES (1 << XLAT_TABLE_ENTRIES_SHIFT)
@@ -87,6 +78,7 @@
#define L3_XLAT_ADDRESS_SHIFT PAGE_SIZE_SHIFT
#define L2_XLAT_ADDRESS_SHIFT (L3_XLAT_ADDRESS_SHIFT + XLAT_TABLE_ENTRIES_SHIFT)
#define L1_XLAT_ADDRESS_SHIFT (L2_XLAT_ADDRESS_SHIFT + XLAT_TABLE_ENTRIES_SHIFT)
+#define L0_XLAT_ADDRESS_SHIFT (L1_XLAT_ADDRESS_SHIFT + XLAT_TABLE_ENTRIES_SHIFT)
/*
* AP[1] bit is ignored by hardware and is