armv8: Support loading 32-bit OS in AArch32 execution state
To support loading a 32-bit OS, the execution state will change from
AArch64 to AArch32 when jumping to kernel.
The architecture information will be got through checking FIT image,
then U-Boot will load 32-bit OS or 64-bit OS automatically.
Signed-off-by: Ebony Zhu <ebony.zhu@nxp.com>
Signed-off-by: Alison Wang <alison.wang@nxp.com>
Signed-off-by: Chenhui Zhao <chenhui.zhao@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
index dedcd1e..6f3be8b 100644
--- a/arch/arm/lib/bootm.c
+++ b/arch/arm/lib/bootm.c
@@ -200,10 +200,6 @@
{
smp_kick_all_cpus();
dcache_disable(); /* flush cache before swtiching to EL2 */
- armv8_switch_to_el2();
-#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
- armv8_switch_to_el1();
-#endif
}
#endif
@@ -280,6 +276,24 @@
}
#endif
+#ifdef CONFIG_ARM64
+#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
+static void switch_to_el1(void)
+{
+ if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
+ (images.os.arch == IH_ARCH_ARM))
+ armv8_switch_to_el1(0, (u64)gd->bd->bi_arch_number,
+ (u64)images.ft_addr,
+ (u64)images.ep,
+ ES_TO_AARCH32);
+ else
+ armv8_switch_to_el1((u64)images.ft_addr, 0, 0,
+ images.ep,
+ ES_TO_AARCH64);
+}
+#endif
+#endif
+
/* Subcommand: GO */
static void boot_jump_linux(bootm_headers_t *images, int flag)
{
@@ -299,7 +313,22 @@
if (!fake) {
do_nonsec_virt_switch();
- kernel_entry(images->ft_addr, NULL, NULL, NULL);
+
+#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
+ armv8_switch_to_el2((u64)images->ft_addr, 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,
+ (u64)images->ep,
+ ES_TO_AARCH32);
+ else
+ armv8_switch_to_el2((u64)images->ft_addr, 0, 0,
+ images->ep,
+ ES_TO_AARCH64);
+#endif
}
#else
unsigned long machid = gd->bd->bi_arch_number;