Some users of the u-boot API (specifically grub) use the initial SP as a hint
regarding where to look for the u-boot API signature.
Signed-off-by: Ian Campbell <i...@hellion.org.uk>
Cc: Marc Zyngier <marc.zyng...@arm.com>
---
This applies on top of Marc's "ARMv7: add PSCI support to u-boot" and allows me
to chainload grub on a cubieboard2. (I don't think that has been applied
anywhere yet?)
---
arch/arm/cpu/armv7/nonsec_virt.S | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/arm/cpu/armv7/nonsec_virt.S b/arch/arm/cpu/armv7/nonsec_virt.S
index 6130a37..2c9e097 100644
--- a/arch/arm/cpu/armv7/nonsec_virt.S
+++ b/arch/arm/cpu/armv7/nonsec_virt.S
@@ -60,6 +60,10 @@ _secure_monitor:
#ifdef CONFIG_ARMV7_VIRT
orreq r5, r5, #0x100 @ allow HVC instruction
moveq r6, #HYP_MODE @ Enter the kernel as HYP
+
+ mrseq r4, sp_svc @ Propagate SP to HYP mode
+ msreq sp_hyp, r4 @ it serves as a "hint" to
+ @ find the u-boot API root.
#endif
mcr p15, 0, r5, c1, c1, 0 @ write SCR (with NS bit set)
--
1.8.4.rc3
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