[U-Boot] [PATCH 6/6] ARM: OMAP5+: Override switch_to_hypervisor function

Keerthy
2016-09-14T05:13:33Z

Override the switch_to_hypervisor function to switch cpu to hypervisor
mode using the available ROM code hook early in the boot phase before
the boot loader checks for HYP mode.

Based on the work done by Jonathan Bergsagel jbergsagel at ti.com.

Cc: beagleboard-x15 at googlegroups.com
Signed-off-by: Keerthy <j-keerthy@ti.com>
---
arch/arm/cpu/armv7/omap-common/lowlevel_init.S | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)

diff --git a/arch/arm/cpu/armv7/omap-common/lowlevel_init.S b/arch/arm/cpu/armv7/omap-common/lowlevel_init.S
index 66a3b3d..8ce12c8 100644
--- a/arch/arm/cpu/armv7/omap-common/lowlevel_init.S
+++ b/arch/arm/cpu/armv7/omap-common/lowlevel_init.S
@@ -24,6 +24,30 @@ ENTRY(save_boot_params)
str r0, [r1]
b save_boot_params_ret
ENDPROC(save_boot_params)
+
+#if !defined(CONFIG_TI_SECURE_DEVICE) && defined(CONFIG_ARMV7_LPAE)
+ENTRY(switch_to_hypervisor)
+
+/*
+ * Switch to hypervisor mode
+ */
+ adr r0, save_sp
+ str sp, [r0]
+ adr r1, restore_from_hyp
+ ldr r0, =0x102
+ b omap_smc1
+restore_from_hyp:
+ adr r0, save_sp
+ ldr sp, [r0]
+ MRC p15, 4, R0, c1, c0, 0
+ ldr r1, =0X1004 @Set cache enable bits for hypervisor mode
+ orr r0, r0, r1
+ MCR p15, 4, R0, c1, c0, 0
+ b switch_to_hypervisor_ret
+save_sp:
+ .word 0x0
+ENDPROC(switch_to_hypervisor)
+#endif
#endif

ENTRY(omap_smc1)
--
1.9.1