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ARM: Fix issue with with way MPIDR is read to include affinity levels.

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The simple_bootloader checks for CPU0 in a manner incompatible with systems
actually using affinity levels -- just looking at MPIDR[7:0].  However, in
future we may wish to use real affinity levels and this method will be in danger
of matching several CPUs with affinity0 = 0.

Match affinity2 == affinity1 == affinity0 == 0 instead.
This commit is contained in:
Matt Evans 2012-09-07 14:20:53 -05:00
parent 5217d5a451
commit 25c1933ffe
1 changed files with 1 additions and 2 deletions
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3
system/arm/simple_bootloader/simple.S
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@ -68,8 +68,7 @@ _entry:
bootldr:
mrc p15, 0, r8, c0, c0, 5 // get the MPIDR register
uxtb r8, r8 // isolate the lower 8 bits (affinity lvl 1)
adds r8, r8, #0 // set flags for branch
bics r8, r8, #0xff000000 // isolate the lower 24 bits (affinity levels)
bxeq r3 // if it's 0 (CPU 0), branch to kernel
mov r8, #1
str r8, [r4, #0] // Enable CPU interface on GIC