ARM: virt: arch_timers: enable access to physical timers

If booting in HYP mode, it makes sense to enable the use of the
physical timers, so the kernel can use them directly.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/arch/arm/kernel/hyp-stub.S b/arch/arm/kernel/hyp-stub.S
index 70609417deaf..65b2417aebce 100644
--- a/arch/arm/kernel/hyp-stub.S
+++ b/arch/arm/kernel/hyp-stub.S
@@ -142,6 +142,19 @@ THUMB(	orr	r7, #(1 << 30)	)	@ HSCTLR.TE
         and     r7, #0x1f               @ Preserve HPMN
         mcr     p15, 4, r7, c1, c1, 1   @ HDCR
 
+#if !defined(ZIMAGE) && defined(CONFIG_ARM_ARCH_TIMER)
+        @ make CNTP_* and CNTPCT accessible from PL1
+        mrc     p15, 0, r7, c0, c1, 1   @ ID_PFR1
+        lsr     r7, #16
+        and     r7, #0xf
+        cmp     r7, #1
+        bne     1f
+        mrc     p15, 4, r7, c14, c1, 0  @ CNTHCTL
+        orr     r7, r7, #3              @ PL1PCEN | PL1PCTEN
+        mcr     p15, 4, r7, c14, c1, 0  @ CNTHCTL
+1:
+#endif
+
         bic     r7, r4, #MODE_MASK
         orr     r7, r7, #SVC_MODE
 THUMB(  orr     r7, r7, #PSR_T_BIT      )