from __future__ import annotations

U64_MASK = (1 << 64) - 1
PAGE_SIZE = 0x1000
MAX_CSTR = 4096
MAX_IO_READ = 1 << 20
DEFAULT_MAX_EXEC_DEPTH = 6
FS_NAME_MAX = 96

# CLeonOS syscall IDs from cleonos/c/include/cleonos_syscall.h
SYS_LOG_WRITE = 0
SYS_TIMER_TICKS = 1
SYS_TASK_COUNT = 2
SYS_CUR_TASK = 3
SYS_SERVICE_COUNT = 4
SYS_SERVICE_READY_COUNT = 5
SYS_CONTEXT_SWITCHES = 6
SYS_KELF_COUNT = 7
SYS_KELF_RUNS = 8
SYS_FS_NODE_COUNT = 9
SYS_FS_CHILD_COUNT = 10
SYS_FS_GET_CHILD_NAME = 11
SYS_FS_READ = 12
SYS_EXEC_PATH = 13
SYS_EXEC_REQUESTS = 14
SYS_EXEC_SUCCESS = 15
SYS_USER_SHELL_READY = 16
SYS_USER_EXEC_REQUESTED = 17
SYS_USER_LAUNCH_TRIES = 18
SYS_USER_LAUNCH_OK = 19
SYS_USER_LAUNCH_FAIL = 20
SYS_TTY_COUNT = 21
SYS_TTY_ACTIVE = 22
SYS_TTY_SWITCH = 23
SYS_TTY_WRITE = 24
SYS_TTY_WRITE_CHAR = 25
SYS_KBD_GET_CHAR = 26
SYS_FS_STAT_TYPE = 27
SYS_FS_STAT_SIZE = 28
SYS_FS_MKDIR = 29
SYS_FS_WRITE = 30
SYS_FS_APPEND = 31
SYS_FS_REMOVE = 32
SYS_LOG_JOURNAL_COUNT = 33
SYS_LOG_JOURNAL_READ = 34
SYS_KBD_BUFFERED = 35
SYS_KBD_PUSHED = 36
SYS_KBD_POPPED = 37
SYS_KBD_DROPPED = 38
SYS_KBD_HOTKEY_SWITCHES = 39
SYS_GETPID = 40
SYS_SPAWN_PATH = 41
SYS_WAITPID = 42
SYS_EXIT = 43
SYS_SLEEP_TICKS = 44
SYS_YIELD = 45
SYS_SHUTDOWN = 46
SYS_RESTART = 47


def u64(value: int) -> int:
    return value & U64_MASK


def u64_neg1() -> int:
    return U64_MASK


def page_floor(addr: int) -> int:
    return addr & ~(PAGE_SIZE - 1)


def page_ceil(addr: int) -> int:
    return (addr + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1)