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authorJan Kiszka <jan.kiszka@siemens.com>2015-04-21 07:18:29 +0200
committerTom Warren <twarren@nvidia.com>2015-05-13 09:24:14 -0700
commit4c681a3d22f0018186d83d753be566965c0cf7a5 (patch)
treed772ea9cb077179b11860c5da0da4536170ed5e3 /arch/arm/cpu/armv7/psci.S
parent4ce4de1e6618340177eeb0914fc86054c6cc6dca (diff)
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ARM: Factor out reusable psci_get_cpu_stack_top
This algorithm will be useful on Tegra as well, plus we will need it for making _psci_target_pc per-CPU. CC: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Thierry Reding <treding@nvidia.com> Tested-by: Thierry Reding <treding@nvidia.com> Tested-by: Ian Campbell <ijc@hellion.org.uk> Signed-off-by: Tom Warren <twarren@nvidia.com>
Diffstat (limited to 'arch/arm/cpu/armv7/psci.S')
-rw-r--r--arch/arm/cpu/armv7/psci.S14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/psci.S b/arch/arm/cpu/armv7/psci.S
index 7d89b43983..18d85c4d56 100644
--- a/arch/arm/cpu/armv7/psci.S
+++ b/arch/arm/cpu/armv7/psci.S
@@ -193,6 +193,20 @@ ENTRY(psci_cpu_off_common)
bx lr
ENDPROC(psci_cpu_off_common)
+@ expects CPU ID in r0 and returns stack top in r0
+ENTRY(psci_get_cpu_stack_top)
+ mov r5, #0x400 @ 1kB of stack per CPU
+ mul r0, r0, r5
+
+ ldr r5, =psci_text_end @ end of monitor text
+ add r5, r5, #0x2000 @ Skip two pages
+ lsr r5, r5, #12 @ Align to start of page
+ lsl r5, r5, #12
+ sub r0, r5, r0 @ here's our stack!
+
+ bx lr
+ENDPROC(psci_get_cpu_stack_top)
+
ENTRY(psci_cpu_entry)
bl psci_enable_smp
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