linux-kernel - [PATCH 4/5] FRV: Make NOMMU-mode work with base addresses other than 0xC0000000

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Message-ID: <20080410150035.30046.93080.stgit@warthog.procyon.org.uk>
Date:	Thu, 10 Apr 2008 16:00:35 +0100
From:	David Howells <dhowells@...hat.com>
To:	torvalds@...l.org, akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, dhowells@...hat.com
Subject: [PATCH 4/5] FRV: Make NOMMU-mode work with base addresses other than
	0xC0000000

From: David Howells <dhowells@...hat.com>

Make NOMMU-mode work with base addresses other than 0xC0000000 by:

 (1) Giving the code that sets up the protection registers the right address
     in __sdram_base.  Rather than being hard coded to 0xC0000000, the value
     of __page_offset is obtained from the linker script.

 (2) Eliminate the check in __switch_to() that verifies the current thread
     info is in the 0xCxxxxxxx region.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 arch/frv/kernel/head.inc    |    2 +-
 arch/frv/kernel/switch_to.S |    7 -------
 2 files changed, 1 insertions(+), 8 deletions(-)


diff --git a/arch/frv/kernel/head.inc b/arch/frv/kernel/head.inc
index d424cd2..bff6662 100644
--- a/arch/frv/kernel/head.inc
+++ b/arch/frv/kernel/head.inc
@@ -46,5 +46,5 @@
 #ifdef CONFIG_MMU
 __sdram_base = 0x00000000		/* base address to which SDRAM relocated */
 #else
-__sdram_base = 0xc0000000		/* base address to which SDRAM relocated */
+__sdram_base = __page_offset		/* base address to which SDRAM relocated */
 #endif
diff --git a/arch/frv/kernel/switch_to.S b/arch/frv/kernel/switch_to.S
index b5275fa..b066686 100644
--- a/arch/frv/kernel/switch_to.S
+++ b/arch/frv/kernel/switch_to.S
@@ -102,13 +102,6 @@ __switch_to:
 	movgs		gr14,lr
 	bar
 
-	srli		gr15,#28,gr5
-	subicc		gr5,#0xc,gr0,icc0
-	beq		icc0,#0,111f
-	break
-	nop
-111:
-
 	# jump to __switch_back or ret_from_fork as appropriate
 	# - move prev to GR8
 	movgs		gr4,psr

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