From: Peter Hoyes <peter.ho...@arm.com>
Use the environment variable armv8_switch_to_el1 to determine whether
to switch to EL1 at runtime. This is an alternative to the
CONFIG_ARMV8_SWITCH_TO_EL1 compile-time option.
The environment variable will be ineffective if the ARMV8_MULTIENTRY
config is used.
This is required by the Armv8r64 architecture, which must be able to
boot at S-EL1 for Linux but may need to boot at other ELs for other
systems.
Signed-off-by: Peter Hoyes <peter.ho...@arm.com>
---
arch/arm/lib/bootm.c | 40 +++++++++++++++++++++++++---------------
1 file changed, 25 insertions(+), 15 deletions(-)
diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
index f60ee3a7e6..ea9bfe7570 100644
--- a/arch/arm/lib/bootm.c
+++ b/arch/arm/lib/bootm.c
@@ -317,7 +317,6 @@ __weak void update_os_arch_secondary_cores(uint8_t os_arch)
{
}
-#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
static void switch_to_el1(void)
{
if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
@@ -332,7 +331,6 @@ static void switch_to_el1(void)
ES_TO_AARCH64);
}
#endif
-#endif
/* Subcommand: GO */
static void boot_jump_linux(bootm_headers_t *images, int flag)
@@ -359,21 +357,33 @@ static void boot_jump_linux(bootm_headers_t *images, int
flag)
update_os_arch_secondary_cores(images->os.arch);
-#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
- armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
- (u64)switch_to_el1, ES_TO_AARCH64);
+#ifdef CONFIG_ARMV8_MULTIENTRY
+ int armv8_switch_to_el1 = -1;
#else
- if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
- (images->os.arch == IH_ARCH_ARM))
- armv8_switch_to_el2(0, (u64)gd->bd->bi_arch_number,
- (u64)images->ft_addr, 0,
- (u64)images->ep,
- ES_TO_AARCH32);
- else
- armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
- images->ep,
- ES_TO_AARCH64);
+ int armv8_switch_to_el1 = env_get_yesno("armv8_switch_to_el1");
#endif
+#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
+ if (armv8_switch_to_el1 == -1) {
+ armv8_switch_to_el1 = 1;
+ }
+#endif
+ if (armv8_switch_to_el1 == 1) {
+ armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
+ (u64)switch_to_el1, ES_TO_AARCH64);
+ } else {
+ if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
+ (images->os.arch == IH_ARCH_ARM))
+ armv8_switch_to_el2(0,
+ (u64)gd->bd->bi_arch_number,
+ (u64)images->ft_addr, 0,
+ (u64)images->ep,
+ ES_TO_AARCH32);
+ else
+ armv8_switch_to_el2((u64)images->ft_addr,
+ 0, 0, 0,
+ images->ep,
+ ES_TO_AARCH64);
+ }
}
#else
unsigned long machid = gd->bd->bi_arch_number;
--
2.25.1
