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efi: Locate all block devices in the app

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When starting the app, locate all block devices and make them available
to U-Boot. This allows listing partitions and accessing files in
filesystems.

EFI also has the concept of 'disks', meaning boot media. For now, this
is not obviously useful in U-Boot, but add code to at least locate these.
This can be expanded later as needed.

We cannot use printf() in the early stub or app since it is not compiled
in

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit is contained in:
Simon Glass 2021-12-29 11:57:36 -07:00 • committed by Heinrich Schuchardt
parent 726cd9836d
commit 613cd0c467
4 changed files with 218 additions and 5 deletions
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15
include/efi_api.h
View file

@ -2035,4 +2035,19 @@ struct efi_firmware_management_protocol {
const u16 *package_version_name);
};
#define EFI_DISK_IO_PROTOCOL_GUID \
EFI_GUID(0xce345171, 0xba0b, 0x11d2, 0x8e, 0x4f, \
0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b)
struct efi_disk {
u64 revision;
efi_status_t (EFIAPI *read_disk)(struct efi_disk *this, u32 media_id,
u64 offset, efi_uintn_t buffer_size,
void *buffer);
efi_status_t (EFIAPI *write_disk)(struct efi_disk *this, u32 media_id,
u64 offset, efi_uintn_t buffer_size,
void *buffer);
};
#endif