[U-Boot] [RESEND PATCH v2 2/6] efi_loader: Initial HII database protocols

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

On Sun, Dec 16, 2018 at 09:36:38PM +0100, Heinrich Schuchardt wrote:
> On 12/14/18 11:10 AM, AKASHI Takahiro wrote:
> > From: Leif Lindholm <leif.lindholm@linaro.org>
> > 
> > This patch provides enough implementation of the following protocols to
> > run EDKII's Shell.efi and UEFI SCT:
> > 
> >   * EfiHiiDatabaseProtocol
> >   * EfiHiiStringProtocol
> > 
> > Not implemented are:
> >   * ExportPackageLists()
> >   * RegisterPackageNotify()/UnregisterPackageNotify()
> >   * SetKeyboardLayout() (i.e. *current* keyboard layout)
> > 
> > HII database protocol can handle only:
> >   * GUID package
> >   * string package
> >   * keyboard layout package
> >   (The other packages, except Device path package, will be necessary
> >    for interactive and graphical UI.)
> > 
> > We'll fill in the rest once SCT is running properly so we can validate
> > the implementation against the conformance test suite.
> > 
> > Cc: Leif Lindholm <leif.lindholm@linaro.org>
> > Signed-off-by: Rob Clark <robdclark@gmail.com>
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
> > ---
> >  include/efi_api.h             | 242 ++++++++++
> >  include/efi_loader.h          |   4 +
> >  lib/efi_loader/Makefile       |   1 +
> >  lib/efi_loader/efi_boottime.c |  12 +
> >  lib/efi_loader/efi_hii.c      | 886 ++++++++++++++++++++++++++++++++++
> >  5 files changed, 1145 insertions(+)
> >  create mode 100644 lib/efi_loader/efi_hii.c
> > 
> > diff --git a/include/efi_api.h b/include/efi_api.h
> > index aef77b6319de..c9dbd5a6037d 100644
> > --- a/include/efi_api.h
> > +++ b/include/efi_api.h
> > @@ -17,6 +17,7 @@
> >  #define _EFI_API_H
> >  
> >  #include <efi.h>
> > +#include <charset.h>
> >  
> >  #ifdef CONFIG_EFI_LOADER
> >  #include <asm/setjmp.h>
> > @@ -697,6 +698,247 @@ struct efi_device_path_utilities_protocol {
> >  		uint16_t node_length);
> >  };
> >  
> > +typedef u16 efi_string_id_t;
> > +
> > +#define EFI_HII_DATABASE_PROTOCOL_GUID	     \
> > +	EFI_GUID(0xef9fc172, 0xa1b2, 0x4693, \
> > +		 0xb3, 0x27, 0x6d, 0x32, 0xfc, 0x41, 0x60, 0x42)
> > +
> > +typedef enum {
> > +	EFI_KEY_LCTRL, EFI_KEY_A0, EFI_KEY_LALT, EFI_KEY_SPACE_BAR,
> > +	EFI_KEY_A2, EFI_KEY_A3, EFI_KEY_A4, EFI_KEY_RCTRL, EFI_KEY_LEFT_ARROW,
> > +	EFI_KEY_DOWN_ARROW, EFI_KEY_RIGHT_ARROW, EFI_KEY_ZERO,
> > +	EFI_KEY_PERIOD, EFI_KEY_ENTER, EFI_KEY_LSHIFT, EFI_KEY_B0,
> > +	EFI_KEY_B1, EFI_KEY_B2, EFI_KEY_B3, EFI_KEY_B4, EFI_KEY_B5, EFI_KEY_B6,
> > +	EFI_KEY_B7, EFI_KEY_B8, EFI_KEY_B9, EFI_KEY_B10, EFI_KEY_RSHIFT,
> > +	EFI_KEY_UP_ARROW, EFI_KEY_ONE, EFI_KEY_TWO, EFI_KEY_THREE,
> > +	EFI_KEY_CAPS_LOCK, EFI_KEY_C1, EFI_KEY_C2, EFI_KEY_C3, EFI_KEY_C4,
> > +	EFI_KEY_C5, EFI_KEY_C6, EFI_KEY_C7, EFI_KEY_C8, EFI_KEY_C9,
> > +	EFI_KEY_C10, EFI_KEY_C11, EFI_KEY_C12, EFI_KEY_FOUR, EFI_KEY_FIVE,
> > +	EFI_KEY_SIX, EFI_KEY_PLUS, EFI_KEY_TAB, EFI_KEY_D1, EFI_KEY_D2,
> > +	EFI_KEY_D3, EFI_KEY_D4, EFI_KEY_D5, EFI_KEY_D6, EFI_KEY_D7, EFI_KEY_D8,
> > +	EFI_KEY_D9, EFI_KEY_D10, EFI_KEY_D11, EFI_KEY_D12, EFI_KEY_D13,
> > +	EFI_KEY_DEL, EFI_KEY_END, EFI_KEY_PG_DN, EFI_KEY_SEVEN, EFI_KEY_EIGHT,
> > +	EFI_KEY_NINE, EFI_KEY_E0, EFI_KEY_E1, EFI_KEY_E2, EFI_KEY_E3,
> > +	EFI_KEY_E4, EFI_KEY_E5, EFI_KEY_E6, EFI_KEY_E7, EFI_KEY_E8, EFI_KEY_E9,
> > +	EFI_KEY_E10, EFI_KEY_E11, EFI_KEY_E12, EFI_KEY_BACK_SPACE,
> > +	EFI_KEY_INS, EFI_KEY_HOME, EFI_KEY_PG_UP, EFI_KEY_NLCK, EFI_KEY_SLASH,
> > +	EFI_KEY_ASTERISK, EFI_KEY_MINUS, EFI_KEY_ESC, EFI_KEY_F1, EFI_KEY_F2,
> > +	EFI_KEY_F3, EFI_KEY_F4, EFI_KEY_F5, EFI_KEY_F6, EFI_KEY_F7, EFI_KEY_F8,
> > +	EFI_KEY_F9, EFI_KEY_F10, EFI_KEY_F11, EFI_KEY_F12, EFI_KEY_PRINT,
> > +	EFI_KEY_SLCK, EFI_KEY_PAUSE,
> > +} efi_key;
> > +
> > +struct efi_key_descriptor {
> > +	efi_key key;
> 
> Hello Takahiro,
> 
> with the patch I can start the EFI shell. But I am still trying to check
> the different definitions in this file.
> 
> As mentioned in prior mail the size of enum is not defined in the C
> spec. So better use u32.

Sure, but I still wonder whether this should be u32 or u16 (or even u8)
as UEFI spec doesn't clearly define this.

> > +	u16 unicode;
> > +	u16 shifted_unicode;
> > +	u16 alt_gr_unicode;
> > +	u16 shifted_alt_gr_unicode;
> > +	u16 modifier;
> > +	u16 affected_attribute;
> > +};
> > +
> > +struct efi_hii_keyboard_layout {
> > +	u16 layout_length;
> > +	efi_guid_t guid;
> 
> A patch to change the alignment of efi_guid_t to __alinged(8) has been
> merged into efi-next.

I have one concern here;
This structure will also be used as a data format/layout in a file,
a package list, given the fact that UEFI defines ExportPackageLists().
So extra six bytes after layout_length, for example, may not be very
useful in general.
I'm not very much sure if UEFI spec intends so.

> > +	u32 layout_descriptor_string_offset;
> > +	u8 descriptor_count;
> > +	struct efi_key_descriptor descriptors[];
> > +};
> > +
> > +struct efi_hii_package_list_header {
> > +	efi_guid_t package_list_guid;
> > +	u32 package_length;
> > +} __packed;
> 
> You are defining several structures as __packed. It is unclear to me
> where I can find this in the UEFI spec. Looking at EDK2 I could not find
> the same __packed attributes.

To be honest, I don't know. I just copied these lines from
the original patch from Leif & Rob.
My guess here is that such data structures are also used as data
formats/layouts as part of a package list in a *file* and that no paddings
are necessary. Same as I explained above.

# Same comments to yours below.

I hope that Leif will confirm (or deny) it.

Thanks,
-Takahiro Akashi

> If this packing is necessary a comment in the code would be helpful.
> 
> > +
> > +/**
> > + * struct efi_hii_package_header - EFI HII package header
> > + *
> > + * @fields:	'fields' replaces the bit-fields defined in the EFI
> > + *		specification to to avoid possible compiler incompatibilities::
> > + *
> > + *		u32 length:24;
> > + *		u32 type:8;
> > + */
> > +struct efi_hii_package_header {
> > +	u32 fields;
> > +} __packed;
> 
> Same here.
> 
> > +
> > +#define __EFI_HII_PACKAGE_LEN_SHIFT	0
> > +#define __EFI_HII_PACKAGE_TYPE_SHIFT	24
> > +#define __EFI_HII_PACKAGE_LEN_MASK	0xffffff
> > +#define __EFI_HII_PACKAGE_TYPE_MASK	0xff
> > +
> > +#define EFI_HII_PACKAGE_HEADER(header, field) \
> > +		(((header)->fields >> __EFI_HII_PACKAGE_##field##_SHIFT) \
> > +		 & __EFI_HII_PACKAGE_##field##_MASK)
> > +#define efi_hii_package_len(header) \
> > +		EFI_HII_PACKAGE_HEADER(header, LEN)
> > +#define efi_hii_package_type(header) \
> > +		EFI_HII_PACKAGE_HEADER(header, TYPE)
> > +
> > +#define EFI_HII_PACKAGE_TYPE_ALL          0x00
> > +#define EFI_HII_PACKAGE_TYPE_GUID         0x01
> > +#define EFI_HII_PACKAGE_FORMS             0x02
> > +#define EFI_HII_PACKAGE_STRINGS           0x04
> > +#define EFI_HII_PACKAGE_FONTS             0x05
> > +#define EFI_HII_PACKAGE_IMAGES            0x06
> > +#define EFI_HII_PACKAGE_SIMPLE_FONTS      0x07
> > +#define EFI_HII_PACKAGE_DEVICE_PATH       0x08
> > +#define EFI_HII_PACKAGE_KEYBOARD_LAYOUT   0x09
> > +#define EFI_HII_PACKAGE_ANIMATIONS        0x0A
> > +#define EFI_HII_PACKAGE_END               0xDF
> > +#define EFI_HII_PACKAGE_TYPE_SYSTEM_BEGIN 0xE0
> > +#define EFI_HII_PACKAGE_TYPE_SYSTEM_END   0xFF
> > +
> > +struct efi_hii_strings_package {
> > +	struct efi_hii_package_header header;
> > +	u32 header_size;
> > +	u32 string_info_offset;
> > +	u16 language_window[16];
> > +	efi_string_id_t language_name;
> > +	u8  language[];
> > +} __packed;
> 
> Same here.
> 
> > +
> > +struct efi_hii_string_block {
> > +	u8 block_type;
> > +	/* u8 block_body[]; */
> > +} __packed;
> 
> Same here.
> 
> Best regards
> 
> Heinrich