From 09ee7b66af286bb65e57a6fa003dfd80d8bbaf4b Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@sunset.davemloft.net>
Date: Tue, 20 Sep 2005 12:18:38 -0700
Subject: [PATCH] --- yaml --- r: 9137 b: refs/heads/master c:
 729b4f7de68191478b20fab19a6d0c6b8c4380c9 h: refs/heads/master i:   9135:
 6635669ff2996754da3e8700f51ee5ec3d2db032 v: v3

---
 [refs]                              |  2 +-
 trunk/arch/sparc64/kernel/entry.S   | 39 ++++++++++++++---------------
 trunk/include/asm-sparc64/pgtable.h | 20 ++++++++-------
 3 files changed, 31 insertions(+), 30 deletions(-)

diff --git a/[refs] b/[refs]
index 3635b4d7ccf0..f92c478ee4a1 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 6a9b490d5fd7f23c5bcd75f970e01633ad3136e3
+refs/heads/master: 729b4f7de68191478b20fab19a6d0c6b8c4380c9
diff --git a/trunk/arch/sparc64/kernel/entry.S b/trunk/arch/sparc64/kernel/entry.S
index 3e0badb820c5..b48349527853 100644
--- a/trunk/arch/sparc64/kernel/entry.S
+++ b/trunk/arch/sparc64/kernel/entry.S
@@ -42,19 +42,15 @@
  * executing (see inherit_locked_prom_mappings() rant).
  */
 sparc64_vpte_nucleus:
-	/* Load 0xf0000000, which is LOW_OBP_ADDRESS.  */
-	mov		0xf, %g5
-	sllx		%g5, 28, %g5
-
-	/* Is addr >= LOW_OBP_ADDRESS?  */
+	/* Note that kvmap below has verified that the address is
+	 * in the range MODULES_VADDR --> VMALLOC_END already.  So
+	 * here we need only check if it is an OBP address or not.
+	 */
+	sethi		%hi(LOW_OBP_ADDRESS), %g5
 	cmp		%g4, %g5
 	blu,pn		%xcc, sparc64_vpte_patchme1
 	 mov		0x1, %g5
-
-	/* Load 0x100000000, which is HI_OBP_ADDRESS.  */
 	sllx		%g5, 32, %g5
-
-	/* Is addr < HI_OBP_ADDRESS?  */
 	cmp		%g4, %g5
 	blu,pn		%xcc, obp_iaddr_patch
 	 nop
@@ -156,26 +152,29 @@ obp_daddr_patch:
  * rather, use information saved during inherit_prom_mappings() using 8k
  * pagesize.
  */
+	.align		32
 kvmap:
-	/* Load 0xf0000000, which is LOW_OBP_ADDRESS.  */
-	mov		0xf, %g5
-	sllx		%g5, 28, %g5
+	sethi		%hi(MODULES_VADDR), %g5
+	cmp		%g4, %g5
+	blu,pn		%xcc, longpath
+	 mov		(VMALLOC_END >> 24), %g5
+	sllx		%g5, 24, %g5
+	cmp		%g4, %g5
+	bgeu,pn		%xcc, longpath
+	 nop
 
-	/* Is addr >= LOW_OBP_ADDRESS?  */
+kvmap_check_obp:
+	sethi		%hi(LOW_OBP_ADDRESS), %g5
 	cmp		%g4, %g5
-	blu,pn		%xcc, vmalloc_addr
+	blu,pn		%xcc, kvmap_vmalloc_addr
 	 mov		0x1, %g5
-
-	/* Load 0x100000000, which is HI_OBP_ADDRESS.  */
 	sllx		%g5, 32, %g5
-
-	/* Is addr < HI_OBP_ADDRESS?  */
 	cmp		%g4, %g5
 	blu,pn		%xcc, obp_daddr_patch
 	 nop
 
-vmalloc_addr:
-	/* If we get here, a vmalloc addr accessed, load kernel VPTE.  */
+kvmap_vmalloc_addr:
+	/* If we get here, a vmalloc addr was accessed, load kernel VPTE.  */
 	ldxa		[%g3 + %g6] ASI_N, %g5
 	brgez,pn	%g5, longpath
 	 nop
diff --git a/trunk/include/asm-sparc64/pgtable.h b/trunk/include/asm-sparc64/pgtable.h
index a2b4f5ed4625..a297f6144f0f 100644
--- a/trunk/include/asm-sparc64/pgtable.h
+++ b/trunk/include/asm-sparc64/pgtable.h
@@ -24,21 +24,23 @@
 #include <asm/processor.h>
 #include <asm/const.h>
 
-/* The kernel image occupies 0x4000000 to 0x1000000 (4MB --> 16MB).
- * The page copy blockops use 0x1000000 to 0x18000000 (16MB --> 24MB).
+/* The kernel image occupies 0x4000000 to 0x1000000 (4MB --> 32MB).
+ * The page copy blockops can use 0x2000000 to 0x10000000.
  * The PROM resides in an area spanning 0xf0000000 to 0x100000000.
- * The vmalloc area spans 0x140000000 to 0x200000000.
+ * The vmalloc area spans 0x100000000 to 0x200000000.
+ * Since modules need to be in the lowest 32-bits of the address space,
+ * we place them right before the OBP area from 0x10000000 to 0xf0000000.
  * There is a single static kernel PMD which maps from 0x0 to address
  * 0x400000000.
  */
-#define	TLBTEMP_BASE		_AC(0x0000000001000000,UL)
-#define MODULES_VADDR		_AC(0x0000000002000000,UL)
-#define MODULES_LEN		_AC(0x000000007e000000,UL)
-#define MODULES_END		_AC(0x0000000080000000,UL)
-#define VMALLOC_START		_AC(0x0000000140000000,UL)
-#define VMALLOC_END		_AC(0x0000000200000000,UL)
+#define	TLBTEMP_BASE		_AC(0x0000000002000000,UL)
+#define MODULES_VADDR		_AC(0x0000000010000000,UL)
+#define MODULES_LEN		_AC(0x00000000e0000000,UL)
+#define MODULES_END		_AC(0x00000000f0000000,UL)
 #define LOW_OBP_ADDRESS		_AC(0x00000000f0000000,UL)
 #define HI_OBP_ADDRESS		_AC(0x0000000100000000,UL)
+#define VMALLOC_START		_AC(0x0000000100000000,UL)
+#define VMALLOC_END		_AC(0x0000000200000000,UL)
 
 /* XXX All of this needs to be rethought so we can take advantage
  * XXX cheetah's full 64-bit virtual address space, ie. no more hole