FRV: Make NOMMU-mode work with base addresses other than 0xC0000000 [try #2]

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@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 1 insertions, 8 deletions

diff --git a/arch/frv/kernel/head.inc b/arch/frv/kernel/head.inc
index d424cd2eb213..bff66628b99a 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 b5275fa9cd0d..b06668670fcc 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