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ARM: Introduce function to switch to hypervisor mode

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On some of the SoCs one cannot enable hypervisor mode directly from the
u-boot because the ROM code puts the chip to supervisor mode after it
jumps to boot loader. Hence introduce a weak function which can be
overridden based on the SoC type and switch to hypervisor mode in a
custom way.

Cc: beagleboard-x15@googlegroups.com
Signed-off-by: Keerthy <j-keerthy@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Keerthy 2016-09-14 10:43:32 +05:30 committed by Tom Rini
parent 60d42e9d51
commit d31d4a2d75
2 changed files with 25 additions and 0 deletions
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21
arch/arm/cpu/armv7/start.S
View file

@ -17,6 +17,7 @@
#include <config.h>
#include <asm/system.h>
#include <linux/linkage.h>
#include <asm/armv7.h>
/*************************************************************************
*
@ -30,11 +31,24 @@
.globl reset
.globl save_boot_params_ret
#ifdef CONFIG_ARMV7_LPAE
.global switch_to_hypervisor_ret
#endif
reset:
/* Allow the board to save important registers */
b save_boot_params
save_boot_params_ret:
#ifdef CONFIG_ARMV7_LPAE
/*
* check for Hypervisor support
*/
mrc p15, 0, r0, c0, c1, 1 @ read ID_PFR1
and r0, r0, #CPUID_ARM_VIRT_MASK @ mask virtualization bits
cmp r0, #(1 << CPUID_ARM_VIRT_SHIFT)
beq switch_to_hypervisor
switch_to_hypervisor_ret:
#endif
/*
* disable interrupts (FIQ and IRQ), also set the cpu to SVC32 mode,
* except if in HYP mode already
@ -103,6 +117,13 @@ ENTRY(save_boot_params)
ENDPROC(save_boot_params)
.weak save_boot_params
#ifdef CONFIG_ARMV7_LPAE
ENTRY(switch_to_hypervisor)
b switch_to_hypervisor_ret
ENDPROC(switch_to_hypervisor)
.weak switch_to_hypervisor
#endif
/*************************************************************************
*
* cpu_init_cp15

4
arch/arm/include/asm/system.h
View file

@ -223,6 +223,10 @@ void __noreturn psci_system_reset(bool smc);
*/
void save_boot_params_ret(void);
#ifdef CONFIG_ARMV7_LPAE
void switch_to_hypervisor_ret(void);
#endif
#define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
#ifdef __ARM_ARCH_7A__