From 1dbc40e7d2c87f40addbfd6b7a2f119493133d22 Mon Sep 17 00:00:00 2001
From: Keerthy <j-keerthy@ti.com>
Date: Wed, 14 Sep 2016 10:43:33 +0530
Subject: [PATCH] ARM: OMAP5+: Override switch_to_hypervisor function

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@ti.com.

Cc: beagleboard-x15@googlegroups.com
Signed-off-by: Keerthy <j-keerthy@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
---
 .../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 66a3b3d26c9..8ce12c8e9ae 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)
-- 
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