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>

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)