[PATCH] ARM: Fix SMP_ON_UP for non ARM ltd. implementations

From: Stephen Boyd
Date: Wed Jan 26 2011 - 18:04:28 EST

The SMP_ON_UP checks restrict the feature to ARM limited designs,
when other implementers support SMP designs. Instead of checking
for an ARM CPU and ARMv6/v7 just check for a v6 or v7 and then
rely on the MPIDR for non ARM 11MPCore designs.

Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
arch/arm/kernel/head.S | 13 +++++++++----
1 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index f17d9a0..ede5b70 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -393,20 +393,25 @@ ENDPROC(__turn_mmu_on)
mov r4, #0x00070000
- orr r3, r4, #0xff000000 @ mask 0xff070000
- orr r4, r4, #0x41000000 @ val 0x41070000
- and r0, r9, r3
- teq r0, r4 @ ARM CPU and ARMv6/v7?
+ and r0, r9, r4
+ teq r0, r4 @ ARMv6/v7?
bne __fixup_smp_on_up @ no, assume UP

+ orr r3, r4, #0xff000000 @ mask 0xff070000
orr r3, r3, #0x0000ff00
orr r3, r3, #0x000000f0 @ mask 0xff07fff0
+ orr r4, r4, #0x41000000 @ val 0x41070000
orr r4, r4, #0x0000b000
orr r4, r4, #0x00000020 @ val 0x4107b020
and r0, r9, r3
teq r0, r4 @ ARM 11MPCore?
moveq pc, lr @ yes, assume SMP

+ mov r4, #0x00070000
+ and r0, r9, #0x000f0000
+ teq r0, r4 @ ARMv6?
+ beq __fixup_smp_on_up @ yes, assume UP
mrc p15, 0, r0, c0, c0, 5 @ read MPIDR
tst r0, #1 << 31
movne pc, lr @ bit 31 => SMP
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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