From: Denis Mukhin <[email protected]> Add common helper to decode/encode ChromuimOS-style GPT attributes similarly to [1].
[1] https://chromium.googlesource.com/chromiumos/platform/vboot_reference/+/master/cgpt Signed-off-by: Denis Mukhin <[email protected]> --- include/cros_flags.h | 74 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 include/cros_flags.h diff --git a/include/cros_flags.h b/include/cros_flags.h new file mode 100644 index 000000000000..e9355fa5e908 --- /dev/null +++ b/include/cros_flags.h @@ -0,0 +1,74 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Bit definitions and masks for GPT attributes for Chromium OS. + * + * 63-61 -- (reserved) + * 60 -- read-only + * 59-58 -- (reserved) + * 57 -- error counter + * 56 -- success + * 55-52 -- tries + * 51-48 -- priority + * 47-3 -- UEFI: reserved for future use + * 2 -- UEFI: Legacy BIOS bootable + * 1 -- UEFI: partition is not mapped + * 0 -- UEFI: partition is required + * + * Reference: + * https://chromium.googlesource.com/chromiumos/platform/vboot_reference/+/master/cgpt + */ + +#ifndef _CROS_FLAGS_H +#define _CROS_FLAGS_H + +#define CROS_FLAG_PRIORITY_MASK 0x000fU +#define CROS_FLAG_TRIES_MASK 0x00f0U +#define CROS_FLAG_SUCCESSFUL_MASK 0x0100U + +#define CROS_FLAG_PRIORITY_SHIFT 0U +#define CROS_FLAG_TRIES_SHIFT 4U +#define CROS_FLAG_SUCCESSFUL_SHIFT 8U + +static inline unsigned int +cros_flags_get_priority(unsigned int flags) +{ + return (flags & CROS_FLAG_PRIORITY_MASK) >> CROS_FLAG_PRIORITY_SHIFT; +} + +static inline unsigned int +cros_flags_set_priority(unsigned int flags, unsigned int priority) +{ + flags &= ~CROS_FLAG_PRIORITY_MASK; + flags |= (priority & 0xf) << CROS_FLAG_PRIORITY_SHIFT; + return flags; +} + +static inline unsigned int +cros_flags_get_tries(unsigned int flags) +{ + return (flags & CROS_FLAG_TRIES_MASK) >> CROS_FLAG_TRIES_SHIFT; +} + +static inline unsigned int +cros_flags_set_tries(unsigned int flags, unsigned int tries) +{ + flags &= ~CROS_FLAG_TRIES_MASK; + flags |= (tries & 0xf) << CROS_FLAG_TRIES_SHIFT; + return flags; +} + +static inline bool +cros_flags_get_successful(unsigned int flags) +{ + return (flags & CROS_FLAG_SUCCESSFUL_MASK) >> CROS_FLAG_SUCCESSFUL_SHIFT; +} + +static inline unsigned int +cros_flags_set_successful(unsigned int flags, bool ok) +{ + flags &= ~CROS_FLAG_SUCCESSFUL_MASK; + flags |= ok << CROS_FLAG_SUCCESSFUL_SHIFT; + return flags; +} + +#endif /* _CROS_FLAGS_H */ -- 2.54.0
