If desired (and possible) switch into HYP mode or non-secure SVC mode
before calling the entry point of an EFI application. This allows
U-Boot to provide a usable PSCI implementation and makes it possible
to boot kernels into hypervisor mode using an EFI bootloader.
Based on diffs from Heinrich Schuchardt and Alexander Graf.
Signed-off-by: Mark Kettenis <kette...@openbsd.org>
---
cmd/bootefi.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index 707d159bac..12a6b84ce6 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -20,6 +20,11 @@
#include <asm-generic/unaligned.h>
#include <linux/linkage.h>
+#ifdef CONFIG_ARMV7_NONSEC
+#include <asm/armv7.h>
+#include <asm/secure.h>
+#endif
+
DECLARE_GLOBAL_DATA_PTR;
#define OBJ_LIST_NOT_INITIALIZED 1
@@ -189,6 +194,18 @@ static efi_status_t efi_run_in_el2(EFIAPI efi_status_t
(*entry)(
}
#endif
+#ifdef CONFIG_ARMV7_NONSEC
+static efi_status_t efi_run_in_hyp(EFIAPI efi_status_t (*entry)(
+ efi_handle_t image_handle, struct efi_system_table *st),
+ efi_handle_t image_handle, struct efi_system_table *st)
+{
+ /* Enable caches again */
+ dcache_enable();
+
+ return efi_do_enter(image_handle, st, entry);
+}
+#endif
+
/* Carve out DT reserved memory ranges */
static efi_status_t efi_carve_out_dt_rsv(void *fdt)
{
@@ -338,6 +355,21 @@ static efi_status_t do_bootefi_exec(void *efi,
}
#endif
+#ifdef CONFIG_ARMV7_NONSEC
+ if (armv7_boot_nonsec()) {
+ dcache_disable(); /* flush cache before switch to HYP */
+
+ armv7_init_nonsec();
+ secure_ram_addr(_do_nonsec_entry)(efi_run_in_hyp,
+ (uintptr_t)entry,
+ (uintptr_t)loaded_image_info_obj.handle,
+ (uintptr_t)&systab);
+
+ /* Should never reach here, efi exits with longjmp */
+ while (1) { }
+ }
+#endif
+
ret = efi_do_enter(loaded_image_info_obj.handle, &systab, entry);
exit:
--
2.16.2
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
https://lists.denx.de/listinfo/u-boot
