[Crash-utility] [PATCH v4 3/4] [ppc] virtual address translation bits for PPC44x

[Suzuki K. Poulose]

This patch adds the definition for PPC44x virtual address translation.

On ppc44x, the virtual-address is split as below :

Bits   |0      10|11      19|20          31|
       -------------------------------------
       |   PGD   |    PTE   | PAGE_OFFSET  |
        -----------------------------------

Also the physical address is 64bit.

Signed-off-by: Suzuki K. Poulose <suzuki at in.ibm.com>
---

 defs.h |   19 +++++++++++++++++++
 ppc.c  |   35 +++++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+), 0 deletions(-)

diff --git a/defs.h b/defs.h
index 0c5558e..6a6011f 100755
--- a/defs.h
+++ b/defs.h
@@ -2654,6 +2654,12 @@ struct load_module {
 #define DEFAULT_PTRS_PER_PGD	(1024)
 #define DEFAULT_PTE_SIZE	sizeof(ulong)
 
+/* PPC44x translation bits */
+#define PPC44x_PGDIR_SHIFT	(21)
+#define PPC44x_PTRS_PER_PTE	(512)
+#define PPC44x_PTRS_PER_PGD	(2048)
+#define PPC44x_PTE_SIZE   	sizeof(ulonglong)
+
 /* PAGE flags */
 #define _PAGE_PRESENT   (machdep->machspec->_page_present)	/* software: pte contains a translation */
 #define _PAGE_USER      (machdep->machspec->_page_user)		/* matches one of the PP bits */
@@ -2680,6 +2686,19 @@ struct load_module {
 #define DEFAULT_PAGE_HWWRITE   0x200
 #define DEFAULT_PAGE_SHARED    0
 
+/* PPC44x PAGE flags: Values from kernel asm/pte-44x.h */
+#define PPC44x_PAGE_PRESENT	0x001
+#define PPC44x_PAGE_RW		0x002
+#define PPC44x_PAGE_ACCESSED	0x008
+#define PPC44x_PAGE_DIRTY	0x010
+#define PPC44x_PAGE_USER	0x040
+#define PPC44x_PAGE_GUARDED	0x100
+#define PPC44x_PAGE_COHERENT	0x200
+#define PPC44x_PAGE_NO_CACHE	0x400
+#define PPC44x_PAGE_WRITETHRU	0x800
+#define PPC44x_PAGE_HWWRITE	0
+#define PPC44x_PAGE_SHARED	0
+
 #define SWP_TYPE(entry) (((entry) >> 1) & 0x7f)
 #define SWP_OFFSET(entry) ((entry) >> 8)
 #define __swp_type(entry)   SWP_TYPE(entry)
diff --git a/ppc.c b/ppc.c
index 9f765b6..2cde018 100755
--- a/ppc.c
+++ b/ppc.c
@@ -73,16 +73,51 @@ static struct line_number_hook ppc_line_number_hooks[];
 
 static struct machine_specific ppc_machine_specific = { 0 };
 static int probe_default_platform(char *);
+static int probe_ppc44x_platform(char *);
 static void ppc_probe_base_platform(void);
 
 typedef int (*probe_func_t) (char *);
 
 probe_func_t probe_platforms[] = {
+	probe_ppc44x_platform,	/* 44x chipsets */
 	probe_default_platform, /* This should be at the end */
 	NULL
 };
 
 static int
+probe_ppc44x_platform(char *name)
+{
+	struct machine_specific *machspec = machdep->machspec;
+
+	/* 44x include ppc440* and ppc470 */
+	if (STRNEQ(name, "ppc440") || STREQ(name, "ppc470")) {
+
+		machspec->platform 		= strdup(name);
+
+		machspec->pgdir_shift		= PPC44x_PGDIR_SHIFT;
+		machspec->ptrs_per_pgd 		= PPC44x_PTRS_PER_PGD;
+		machspec->ptrs_per_pte		= PPC44x_PTRS_PER_PTE;
+		machspec->pte_size 		= PPC44x_PTE_SIZE;
+
+		machspec->_page_present		= PPC44x_PAGE_PRESENT;
+		machspec->_page_user 		= PPC44x_PAGE_USER;
+		machspec->_page_rw 		= PPC44x_PAGE_RW;
+		machspec->_page_guarded		= PPC44x_PAGE_GUARDED;
+		machspec->_page_coherent 	= PPC44x_PAGE_COHERENT;
+		machspec->_page_no_cache 	= PPC44x_PAGE_NO_CACHE;
+		machspec->_page_writethru 	= PPC44x_PAGE_WRITETHRU;
+		machspec->_page_dirty 		= PPC44x_PAGE_DIRTY;
+		machspec->_page_accessed 	= PPC44x_PAGE_ACCESSED;
+		machspec->_page_hwwrite 	= PPC44x_PAGE_HWWRITE;
+		machspec->_page_shared 		= PPC44x_PAGE_SHARED;
+
+		return TRUE;
+	}
+
+	return FALSE;
+}
+
+static int
 probe_default_platform(char *name)
 {
 	struct machine_specific *machspec = machdep->machspec;