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 kettenis@openbsd.org --- cmd/bootefi.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+)
diff --git a/cmd/bootefi.c b/cmd/bootefi.c index 707d159bac..a5d144d9a4 100644 --- a/cmd/bootefi.c +++ b/cmd/bootefi.c @@ -20,6 +20,11 @@ #include <asm-generic/unaligned.h> #include <linux/linkage.h>
+#ifdef CONFIG_ARM +#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: