[Crash-utility] [PATCH v3 1/3] [ppc] Non-linear address translation routine

[Suzuki K. Poulose]

This patch moves the common code for traversing through the PGD, PTE
tables in userspace virtual address translation and vmalloc address translation
to a new routine. This will help us to make changes to the common code
at a single place. This will be used for board based definitions for address
translation

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

 ppc.c |  184 +++++++++++++++++++++++------------------------------------------
 1 files changed, 65 insertions(+), 119 deletions(-)

diff --git a/ppc.c b/ppc.c
index a9068c2..3834e7f 100755
--- a/ppc.c
+++ b/ppc.c
@@ -259,6 +259,69 @@ ppc_dump_machdep_table(ulong arg)
 	fprintf(fp, "           machspec: %lx\n", (ulong)machdep->machspec);
 }
 
+static int
+ppc_pgd_vtop(ulong *pgd, ulong vaddr, physaddr_t *paddr, int verbose)
+{
+	ulong *page_dir;
+	ulong *page_middle;
+	ulong *page_table;
+	ulong pgd_pte;
+	ulong pte;
+
+	if (verbose) 
+		fprintf(fp, "PAGE DIRECTORY: %lx\n", (ulong)pgd);
+
+	page_dir = pgd + (vaddr >> PGDIR_SHIFT);
+
+        FILL_PGD(PAGEBASE(pgd), KVADDR, PAGESIZE());
+        pgd_pte = ULONG(machdep->pgd + PAGEOFFSET(page_dir));
+
+	if (verbose)
+		fprintf(fp, "  PGD: %lx => %lx\n", (ulong)page_dir, pgd_pte);
+
+	if (!pgd_pte)
+		goto no_page;
+
+	page_middle = (ulong *)pgd_pte;
+
+	if (machdep->flags & CPU_BOOKE)
+		page_table = page_middle + (BTOP(vaddr) & (PTRS_PER_PTE - 1));
+	else {
+		page_table = (ulong *)((pgd_pte & (ulong)machdep->pagemask) + machdep->kvbase);
+		page_table += ((ulong)BTOP(vaddr) & (PTRS_PER_PTE-1));
+	}
+
+	if (verbose)
+		fprintf(fp, "  PMD: %lx => %lx\n", (ulong)page_middle, 
+			(ulong)page_table);
+
+        FILL_PTBL(PAGEBASE(page_table), KVADDR, PAGESIZE());
+        pte = ULONG(machdep->ptbl + PAGEOFFSET(page_table));
+
+	if (verbose) 
+		fprintf(fp, "  PTE: %lx => %lx\n", (ulong)page_table, pte);
+
+	if (!(pte & _PAGE_PRESENT)) { 
+		if (pte && verbose) {
+			fprintf(fp, "\n");
+			ppc_translate_pte(pte, 0, 0);
+		}
+		goto no_page;
+	}
+
+	if (verbose) {
+		fprintf(fp, " PAGE: %lx\n\n", PAGEBASE(pte));
+		ppc_translate_pte(pte, 0, 0);
+	}
+
+	*paddr = PAGEBASE(pte) + PAGEOFFSET(vaddr);
+
+	return TRUE;
+
+no_page:
+	return FALSE;
+
+}
 
 /*
  *  Translates a user virtual address to its physical address.  cmd_vtop()
@@ -275,11 +338,6 @@ ppc_uvtop(struct task_context *tc, ulong vaddr, physaddr_t *paddr, int verbose)
 {
 	ulong mm, active_mm;
 	ulong *pgd;
-	ulong *page_dir;
-	ulong *page_middle;
-	ulong *page_table;
-	ulong pgd_pte;
-	ulong pte;
 
 	if (!tc)
 		error(FATAL, "current context invalid\n");
@@ -315,62 +373,7 @@ ppc_uvtop(struct task_context *tc, ulong vaddr, physaddr_t *paddr, int verbose)
 				FAULT_ON_ERROR);
 	}
 
-	if (verbose) 
-		fprintf(fp, "PAGE DIRECTORY: %lx\n", (ulong)pgd);
-
-	page_dir = pgd + (vaddr >> PGDIR_SHIFT);
-
-	FILL_PGD(PAGEBASE(pgd), KVADDR, PAGESIZE());
-	pgd_pte = ULONG(machdep->pgd + PAGEOFFSET(page_dir));
-
-	if (verbose)
-		fprintf(fp, "  PGD: %lx => %lx\n", (ulong)page_dir, pgd_pte);
-
-	if (!pgd_pte)
-		goto no_upage;
-
-	page_middle = (ulong *)pgd_pte;
-
-	if (machdep->flags & CPU_BOOKE)
-		page_table = page_middle + (BTOP(vaddr) & (PTRS_PER_PTE - 1));
-	else {
-		page_table = (ulong *)((pgd_pte & (ulong)machdep->pagemask) + machdep->kvbase);
-		page_table += ((ulong)BTOP(vaddr) & (PTRS_PER_PTE-1));
-	}
-
-	if (verbose)
-		fprintf(fp, "  PMD: %lx => %lx\n",(ulong)page_middle, 
-			(ulong)page_table);
-	
-        FILL_PTBL(PAGEBASE(page_table), KVADDR, PAGESIZE());
-	pte = ULONG(machdep->ptbl + PAGEOFFSET(page_table));
-
-        if (verbose) 
-                fprintf(fp, "  PTE: %lx => %lx\n", (ulong)page_table, pte);
-
-	if (!(pte & _PAGE_PRESENT)) {
-		*paddr = pte;
-		if (pte && verbose) {
-			fprintf(fp, "\n");
-			ppc_translate_pte(pte, 0, 0);
-		}
-		goto no_upage;
-	}
-
-	if (!pte)
-		goto no_upage;
-
-	*paddr = PAGEBASE(pte) + PAGEOFFSET(vaddr);
-
-        if (verbose) {
-                fprintf(fp, " PAGE: %lx\n\n", PAGEBASE(pte));
-		ppc_translate_pte(pte, 0, 0);
-	}
-
-	return TRUE;
-
-no_upage:
-	return FALSE;
+	return ppc_pgd_vtop(pgd, vaddr, paddr, verbose);
 }
 
 /*
@@ -382,11 +385,6 @@ static int
 ppc_kvtop(struct task_context *tc, ulong kvaddr, physaddr_t *paddr, int verbose)
 {
 	ulong *pgd;
-	ulong *page_dir;
-	ulong *page_middle;
-	ulong *page_table;
-        ulong pgd_pte;
-        ulong pte;
 
 	if (!IS_KVADDR(kvaddr))
 		return FALSE;
@@ -403,59 +401,7 @@ ppc_kvtop(struct task_context *tc, ulong kvaddr, physaddr_t *paddr, int verbose)
 	}
 
 	pgd = (ulong *)vt->kernel_pgd[0];
-
-	if (verbose) 
-		fprintf(fp, "PAGE DIRECTORY: %lx\n", (ulong)pgd);
-
-	page_dir = pgd + (kvaddr >> PGDIR_SHIFT);
-
-        FILL_PGD(PAGEBASE(pgd), KVADDR, PAGESIZE());
-        pgd_pte = ULONG(machdep->pgd + PAGEOFFSET(page_dir));
-
-	if (verbose)
-		fprintf(fp, "  PGD: %lx => %lx\n", (ulong)page_dir, pgd_pte);
-
-	if (!pgd_pte)
-		goto no_kpage;
-
-	page_middle = (ulong *)pgd_pte;
-
-	if (machdep->flags & CPU_BOOKE)
-		page_table = page_middle + (BTOP(kvaddr) & (PTRS_PER_PTE - 1));
-	else {
-		page_table = (ulong *)((pgd_pte & (ulong)machdep->pagemask) + machdep->kvbase);
-		page_table += ((ulong)BTOP(kvaddr) & (PTRS_PER_PTE-1));
-	}
-
-	if (verbose)
-		fprintf(fp, "  PMD: %lx => %lx\n", (ulong)page_middle, 
-			(ulong)page_table);
-
-        FILL_PTBL(PAGEBASE(page_table), KVADDR, PAGESIZE());
-        pte = ULONG(machdep->ptbl + PAGEOFFSET(page_table));
-
-	if (verbose) 
-		fprintf(fp, "  PTE: %lx => %lx\n", (ulong)page_table, pte);
-
-	if (!(pte & _PAGE_PRESENT)) { 
-		if (pte && verbose) {
-			fprintf(fp, "\n");
-			ppc_translate_pte(pte, 0, 0);
-		}
-		goto no_kpage;
-	}
-
-	if (verbose) {
-		fprintf(fp, " PAGE: %lx\n\n", PAGEBASE(pte));
-		ppc_translate_pte(pte, 0, 0);
-	}
-
-	*paddr = PAGEBASE(pte) + PAGEOFFSET(kvaddr);
-
-	return TRUE;
-
-no_kpage:
-	return FALSE;
+	return ppc_pgd_vtop(pgd, kvaddr, paddr, verbose);
 }
 
 /*