diff options
| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2006-06-29 15:09:57 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-06-29 15:09:57 +0100 |
| commit | 22b1908610dd7ff68471cd4fbd383dbdfe5e0ecd (patch) | |
| tree | 696d910ef791433a6a6bbd30ae841a106ce78a88 /arch/arm/mm/proc-sa1100.S | |
| parent | 264edb35ce5c85749bfdd2942c74b786ea1cde41 (diff) | |
[ARM] nommu: provide a way for correct control register value selection
Most MMU-based CPUs have a restriction on the setting of the data cache
enable and mmu enable bits in the control register, whereby if the data
cache is enabled, the MMU must also be enabled. Enabling the data
cache without the MMU is an invalid combination.
However, there are CPUs where the data cache can be enabled without the
MMU.
In order to allow these CPUs to take advantage of that, provide a
method whereby each proc-*.S file defines the control regsiter value
for use with nommu (with the MMU disabled.) Later on, when we add
support for enabling the MMU on these devices, we can adjust the
"crval" macro to also enable the data cache for nommu.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/proc-sa1100.S')
| -rw-r--r-- | arch/arm/mm/proc-sa1100.S | 15 |
1 files changed, 6 insertions, 9 deletions
diff --git a/arch/arm/mm/proc-sa1100.S b/arch/arm/mm/proc-sa1100.S index 0a2107ad4c32..b43696c565fc 100644 --- a/arch/arm/mm/proc-sa1100.S +++ b/arch/arm/mm/proc-sa1100.S @@ -198,11 +198,11 @@ __sa1100_setup: #ifdef CONFIG_MMU mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4 #endif + adr r5, sa1100_crval + ldmia r5, {r5, r6} mrc p15, 0, r0, c1, c0 @ get control register v4 - ldr r5, sa1100_cr1_clear bic r0, r0, r5 - ldr r5, sa1100_cr1_set - orr r0, r0, r5 + orr r0, r0, r6 mov pc, lr .size __sa1100_setup, . - __sa1100_setup @@ -212,12 +212,9 @@ __sa1100_setup: * ..11 0001 ..11 1101 * */ - .type sa1100_cr1_clear, #object - .type sa1100_cr1_set, #object -sa1100_cr1_clear: - .word 0x3f3f -sa1100_cr1_set: - .word 0x313d + .type sa1100_crval, #object +sa1100_crval: + crval clear=0x00003f3f, mmuset=0x0000313d, ucset=0x00001130 __INITDATA |