MIPS: tlbex: Better debug output.

Pgtable bits are assigned dynamically depending on processor feature and
statically based on kernel configuration.  To make sense out of the
disassembled TLB exception handlers a list of the actual assignments
used for a particular configuration and hardware setup can be very useful.

Output the actual TLB exception handlers in a format that simplifies their
post processsing from dmesg output.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 69 insertions, 35 deletions

diff --git a/arch/mips/include/asm/pgtable-bits.h b/arch/mips/include/asm/pgtable-bits.h
index da4ba49adcf6..f8b8fb358412 100644
--- a/arch/mips/include/asm/pgtable-bits.h
+++ b/arch/mips/include/asm/pgtable-bits.h
@@ -34,38 +34,72 @@
  */
 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 
-#define _PAGE_PRESENT               (1<<6)  /* implemented in software */
-#define _PAGE_READ                  (1<<7)  /* implemented in software */
-#define _PAGE_WRITE                 (1<<8)  /* implemented in software */
-#define _PAGE_ACCESSED              (1<<9)  /* implemented in software */
-#define _PAGE_MODIFIED              (1<<10) /* implemented in software */
-#define _PAGE_FILE                  (1<<10) /* set:pagecache unset:swap */
-
-#define _PAGE_R4KBUG                (1<<0)  /* workaround for r4k bug  */
-#define _PAGE_GLOBAL                (1<<0)
-#define _PAGE_VALID                 (1<<1)
-#define _PAGE_SILENT_READ           (1<<1)  /* synonym                 */
-#define _PAGE_DIRTY                 (1<<2)  /* The MIPS dirty bit      */
-#define _PAGE_SILENT_WRITE          (1<<2)
-#define _CACHE_SHIFT                3
-#define _CACHE_MASK                 (7<<3)
+/*
+ * The following bits are directly used by the TLB hardware
+ */
+#define _PAGE_R4KBUG		(1 << 0)  /* workaround for r4k bug  */
+#define _PAGE_GLOBAL		(1 << 0)
+#define _PAGE_VALID_SHIFT	1
+#define _PAGE_VALID		(1 << _PAGE_VALID_SHIFT)
+#define _PAGE_SILENT_READ	(1 << 1)  /* synonym                 */
+#define _PAGE_DIRTY_SHIFT	2
+#define _PAGE_DIRTY		(1 << _PAGE_DIRTY_SHIFT)  /* The MIPS dirty bit      */
+#define _PAGE_SILENT_WRITE	(1 << 2)
+#define _CACHE_SHIFT		3
+#define _CACHE_MASK		(7 << 3)
+
+/*
+ * The following bits are implemented in software
+ *
+ * _PAGE_FILE semantics: set:pagecache unset:swap
+ */ 
+#define _PAGE_PRESENT_SHIFT	6
+#define _PAGE_PRESENT		(1 << _PAGE_PRESENT_SHIFT)
+#define _PAGE_READ_SHIFT	7
+#define _PAGE_READ		(1 << _PAGE_READ_SHIFT)
+#define _PAGE_WRITE_SHIFT	8
+#define _PAGE_WRITE		(1 << _PAGE_WRITE_SHIFT)
+#define _PAGE_ACCESSED_SHIFT	9
+#define _PAGE_ACCESSED		(1 << _PAGE_ACCESSED_SHIFT)
+#define _PAGE_MODIFIED_SHIFT	10
+#define _PAGE_MODIFIED		(1 << _PAGE_MODIFIED_SHIFT)
+
+#define _PAGE_FILE		(1 << 10)
 
 #elif defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
 
-#define _PAGE_PRESENT               (1<<0)  /* implemented in software */
-#define _PAGE_READ                  (1<<1)  /* implemented in software */
-#define _PAGE_WRITE                 (1<<2)  /* implemented in software */
-#define _PAGE_ACCESSED              (1<<3)  /* implemented in software */
-#define _PAGE_MODIFIED              (1<<4)  /* implemented in software */
-#define _PAGE_FILE                  (1<<4)  /* set:pagecache unset:swap */
-
-#define _PAGE_GLOBAL                (1<<8)
-#define _PAGE_VALID                 (1<<9)
-#define _PAGE_SILENT_READ           (1<<9)  /* synonym                 */
-#define _PAGE_DIRTY                 (1<<10) /* The MIPS dirty bit      */
-#define _PAGE_SILENT_WRITE          (1<<10)
-#define _CACHE_UNCACHED             (1<<11)
-#define _CACHE_MASK                 (1<<11)
+/*
+ * The following are implemented by software
+ *
+ * _PAGE_FILE semantics: set:pagecache unset:swap
+ */
+#define _PAGE_PRESENT_SHIFT	0
+#define _PAGE_PRESENT		(1 <<  _PAGE_PRESENT_SHIFT)
+#define _PAGE_READ_SHIFT	1
+#define _PAGE_READ		(1 <<  _PAGE_READ_SHIFT)
+#define _PAGE_WRITE_SHIFT	2
+#define _PAGE_WRITE		(1 <<  _PAGE_WRITE_SHIFT)
+#define _PAGE_ACCESSED_SHIFT	3
+#define _PAGE_ACCESSED		(1 <<  _PAGE_ACCESSED_SHIFT)
+#define _PAGE_MODIFIED_SHIFT	4
+#define _PAGE_MODIFIED		(1 <<  _PAGE_MODIFIED_SHIFT)
+#define _PAGE_FILE_SHIFT	4
+#define _PAGE_FILE		(1 <<  _PAGE_FILE_SHIFT)
+
+/*
+ * And these are the hardware TLB bits
+ */
+#define _PAGE_GLOBAL_SHIFT	8
+#define _PAGE_GLOBAL		(1 <<  _PAGE_GLOBAL_SHIFT)
+#define _PAGE_VALID_SHIFT	9
+#define _PAGE_VALID		(1 <<  _PAGE_VALID_SHIFT)
+#define _PAGE_SILENT_READ	(1 <<  _PAGE_VALID_SHIFT)	/* synonym  */
+#define _PAGE_DIRTY_SHIFT	10
+#define _PAGE_DIRTY		(1 << _PAGE_DIRTY_SHIFT)
+#define _PAGE_SILENT_WRITE	(1 << _PAGE_DIRTY_SHIFT)
+#define _CACHE_UNCACHED_SHIFT	11
+#define _CACHE_UNCACHED		(1 << _CACHE_UNCACHED_SHIFT)
+#define _CACHE_MASK		(1 << _CACHE_UNCACHED_SHIFT)
 
 #else /* 'Normal' r4K case */
 /*
@@ -76,22 +110,22 @@
  * which is more than we need right now.
  */
 
-/* implemented in software */
+/*
+ * The following bits are implemented in software
+ *
+ * _PAGE_READ / _PAGE_READ_SHIFT should be unused if cpu_has_rixi.
+ * _PAGE_FILE semantics: set:pagecache unset:swap
+ */
 #define _PAGE_PRESENT_SHIFT	(0)
 #define _PAGE_PRESENT		(1 << _PAGE_PRESENT_SHIFT)
-/* implemented in software, should be unused if cpu_has_rixi. */
 #define _PAGE_READ_SHIFT	(cpu_has_rixi ? _PAGE_PRESENT_SHIFT : _PAGE_PRESENT_SHIFT + 1)
 #define _PAGE_READ ({BUG_ON(cpu_has_rixi); 1 << _PAGE_READ_SHIFT; })
-/* implemented in software */
 #define _PAGE_WRITE_SHIFT	(_PAGE_READ_SHIFT + 1)
 #define _PAGE_WRITE		(1 << _PAGE_WRITE_SHIFT)
-/* implemented in software */
 #define _PAGE_ACCESSED_SHIFT	(_PAGE_WRITE_SHIFT + 1)
 #define _PAGE_ACCESSED		(1 << _PAGE_ACCESSED_SHIFT)
-/* implemented in software */
 #define _PAGE_MODIFIED_SHIFT	(_PAGE_ACCESSED_SHIFT + 1)
 #define _PAGE_MODIFIED		(1 << _PAGE_MODIFIED_SHIFT)
-/* set:pagecache unset:swap */
 #define _PAGE_FILE		(_PAGE_MODIFIED)
 
 #ifdef CONFIG_HUGETLB_PAGE