[U-Boot] [RFC v2 08/11] cmd: bootefi: carve out bootmgr code from do_bootefi()

[AKASHI Takahiro <takahiro.akashi@linaro.org>]

On Fri, Apr 12, 2019 at 10:58:25AM +0200, Heinrich Schuchardt wrote:
> 
> 
> On 4/12/19 9:06 AM, AKASHI Takahiro wrote:
> > On Fri, Apr 12, 2019 at 07:55:16AM +0200, Heinrich Schuchardt wrote:
> >> On 3/27/19 5:40 AM, AKASHI Takahiro wrote:
> >>> This is a preparatory patch for reworking do_bootefi() in later patch.
> >>> do_bootmgr_exec() is renamed to do_efibootmgr() as we put all the necessary
> >>> code into this function.
> >>>
> >>> Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
> >>> ---
> >>>  cmd/bootefi.c | 42 ++++++++++++++++++++++++++++++++++--------
> >>>  1 file changed, 34 insertions(+), 8 deletions(-)
> >>>
> >>> diff --git a/cmd/bootefi.c b/cmd/bootefi.c
> >>> index e9d4881997a1..94b5bdeed3f1 100644
> >>> --- a/cmd/bootefi.c
> >>> +++ b/cmd/bootefi.c
> >>> @@ -309,22 +309,47 @@ err_add_protocol:
> >>>  	return ret;
> >>>  }
> >>>
> >>> -static int do_bootefi_bootmgr_exec(void)
> >>> +/**
> >>> + * do_efibootmgr() - execute EFI Boot Manager
> >>> + *
> >>> + * @fdt_opt:	string of fdt start address
> >>> + * Return:	status code
> >>> + *
> >>> + * Execute EFI Boot Manager
> >>> + */
> >>> +static int do_efibootmgr(const char *fdt_opt)
> >>>  {
> >>>  	struct efi_device_path *device_path, *file_path;
> >>>  	void *addr;
> >>> -	efi_status_t r;
> >>> +	efi_status_t ret;
> >>> +
> >>> +	/* Allow unaligned memory access */
> >>> +	allow_unaligned();
> >>> +
> >>> +	switch_to_non_secure_mode();
> >>> +
> >>
> >> Shouldn't we move these two call to efi_init_obj_list()?
> >
> > Given the fact that efi_init_obj_list() is called without invoking
> > any UEFI binary at some places, I'm not sure that it is the right
> > place where switch_to_non_secure_mode() be called.

If this is UEFI(and arm)-specific, it should be placed just
before setjmp() in efi_start_image().

But I'm not sure whether we should call switch_to_non_secure_mode()
even for a driver, which is logically part of U-Boot UEFI.

-Takahiro Akashi

> I think this could even be done in initr_reloc_global_data().
> 
> @Alex
> What are your thoughts.
> 
> Best regards
> 
> Heinrich
> 
> >
> > -Takahiro Akashi
> >
> >
> >> Best regards
> >>
> >> Heinrich
> >>
> >>> +	/* Initialize EFI drivers */
> >>> +	ret = efi_init_obj_list();
> >>> +	if (ret != EFI_SUCCESS) {
> >>> +		printf("Error: Cannot initialize UEFI sub-system, r = %lu\n",
> >>> +		       ret & ~EFI_ERROR_MASK);
> >>> +		return CMD_RET_FAILURE;
> >>> +	}
> >>> +
> >>> +	ret = efi_install_fdt(fdt_opt);
> >>> +	if (ret != EFI_SUCCESS)
> >>> +		return CMD_RET_FAILURE;
> >>>
> >>>  	addr = efi_bootmgr_load(&device_path, &file_path);
> >>>  	if (!addr)
> >>>  		return 1;
> >>>
> >>>  	printf("## Starting EFI application at %p ...\n", addr);
> >>> -	r = do_bootefi_exec(addr, device_path, file_path);
> >>> +	ret = do_bootefi_exec(addr, device_path, file_path);
> >>>  	printf("## Application terminated, r = %lu\n",
> >>> -	       r & ~EFI_ERROR_MASK);
> >>> +	       ret & ~EFI_ERROR_MASK);
> >>>
> >>> -	if (r != EFI_SUCCESS)
> >>> +	if (ret != EFI_SUCCESS)
> >>>  		return 1;
> >>>
> >>>  	return 0;
> >>> @@ -463,6 +488,9 @@ static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
> >>>
> >>>  	if (argc < 2)
> >>>  		return CMD_RET_USAGE;
> >>> +
> >>> +	if (!strcmp(argv[1], "bootmgr"))
> >>> +		return do_efibootmgr(argc > 2 ? argv[2] : NULL);
> >>>  #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
> >>>  	else if (!strcmp(argv[1], "selftest"))
> >>>  		return do_efi_selftest(argc > 2 ? argv[2] : NULL);
> >>> @@ -497,9 +525,7 @@ static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
> >>>  		memcpy(map_sysmem(addr, size), __efi_helloworld_begin, size);
> >>>  	} else
> >>>  #endif
> >>> -	if (!strcmp(argv[1], "bootmgr")) {
> >>> -		return do_bootefi_bootmgr_exec();
> >>> -	} else {
> >>> +	{
> >>>  		saddr = argv[1];
> >>>
> >>>  		addr = simple_strtoul(saddr, NULL, 16);
> >>>
> >>
> >