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

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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>
This commit is contained in:
David Howells 2008-04-10 16:11:00 +01:00 committed by Linus Torvalds
parent e31c243f98
commit ed9b949f55
2 changed files with 1 additions and 8 deletions
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2
arch/frv/kernel/head.inc
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@ -46,5 +46,5 @@
#ifdef CONFIG_MMU #ifdef CONFIG_MMU
__sdram_base = 0x00000000 /* base address to which SDRAM relocated */ __sdram_base = 0x00000000 /* base address to which SDRAM relocated */
#else #else
__sdram_base = 0xc0000000 /* base address to which SDRAM relocated */ __sdram_base = __page_offset /* base address to which SDRAM relocated */
#endif #endif

7
arch/frv/kernel/switch_to.S
View File

@ -102,13 +102,6 @@ __switch_to:
movgs gr14,lr movgs gr14,lr
bar 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 # jump to __switch_back or ret_from_fork as appropriate
# - move prev to GR8 # - move prev to GR8
movgs gr4,psr movgs gr4,psr