* Fix file append len update

* Fix getdents not saving state & script pipes

* Fix open unspecified dir

* syscall RENAMEAT

* FD close on exec & Fix paging attrs

* syscall dummy PPOLL & Fix brk, all_clusters, lines

* Fix phys unique passing

* procfs meminfo

* procfs mounts

* Move target to riscv64gc & add FP support

* Add 3 counters for tasks

* Fix test & format

* Fix Virt::commit & remove obsolete signal restorer

* Adjust channels code tree & add oneshot channel

* Fix VirtIO block fake NotReady

* separate tests & compile-time logging

* Replace legacy sbi console with UART

* Make UART interrupt driven

* syscall SENDFILE

* syscall FACCESSAT, dummy_zero & test code

* syscall RUSAGE, READLINKAT & executable name

* Phys merge sole parents

* Resolve PLIC & Add `Command`

* Modify some code

* Move MMAP* to crate::mem

* Simplify preempt state & minor tweaks

* Cancel prefetching in cache FS

* Switch to dynamic test

* syscall MEMBARRIER & automize testing

* Tweak test sequence

* Add RW multiple blocks concurrently in VirtIO

* Fix proactor's potential buffer access-after-free

* Replace semaphore with raw event

* Add futexes (robust list todo)

* syscall ROBUST_LIST

* Fix format

* syscall SIGPROCMASK & SIGALTSTACK & SIGACTION

* Add user signal handling

* syscall SIGTIMEDWAIT & KILL & SET_TID_ADDR; comp2

* syscall LSEEK CLOCK PRLIMIT & some tweaks

* syscall RWV & tmpfs & fix some behaviors

* Accelerate FAT32 cluster chain reading

* Add subphys feature

* Cached FS (Phys refactoring todo)

* Phys hierarchified (flusher to do)

* Add flusher for Phys

* tmpfs tweak & some misc syscalls

* Root path separation

* syscall STATFS & FCNTL

* syscall PRWV & fd reuse

* Modify times

* Fix RWV buffers

* Fix format

* Fix PLIC operations

* Fix task exit behavior & remove `main` field

* Tweak some code

* Fix some behaviors

* Fix timer intr & Virt::clear

* Fix virt cpu_mask acquisition

* Add thread group impl (signal unfinished)

* Fix fatal signal behavior

* Add multiscope signals (user handler unfinished)

* Adjust code tree

* Tweak user pointer

* Fix phys COW behavior

* syscall PIPE

* syscall UNAME

* syscall (U)MOUNT

* syscall EXECVE

* Adjust files

* syscall CLONE & WAITPID

* syscall EXIT WAITPID(unfinished) YIELD

* fix syscall WAITPID

* syscall FSTAT

* syscall task stats & times

* Adjust files

* syscall MMAP & MUNMAP

* Fix format & test

* Fix format

* Some syscalls

* Configure tests

* syscall OPENAT

* syscall UNLINKAT & CLOSE

* syscall DUP*

* syscall BRK

* syscall GETDENTS64

* Fix BRK randomness

* Fix format

* Add COW option for phys

* Add basic ELF loader

* Add basic task loaders

* Replace kmem::Backend with umio::Io & run tasks

* Set up lazy memory commission

* Add task events

* Add serial device files

* Add FD manager & WRITE syscall impl

* Add user pointers & buffers

* Fix comp

* Fix virt locking & pinning strategy

* Add some trace msgs & bug fixes

* Add blocking RwLock & Backend casting

* Bug fixes

* Add read_exact & write_all; add some tracing msgs

* Add FAT32 impl

* Implement generic FS traits

* Optimize intr insertion policy

* Fix tests

* Add parameter checks for Virt

* Add built-in virt context switching & TLB flushing

* Fix TLB

* Initialize devices (unfinished)

* Add VirtIO HAL implementation

* Add common block device trait

* Initialize devices

* Optimize device init strategy

* Add basic user tasks

* Add phys backend for block devices

* Add block backend conversions

* Fix shared mappings (unfinished)

* Add pinning for address mapping

* add some simple vm funcs

* fix unmap in a not satisfing way

* remove need_free argu from unmap func

* remove need_free argu from unmap func

* remove need_free argu from unmap func

* add unit test for map_funcs in comment style and fix some bugs with the test

* fix test with const argus

* modify unmap as a recursive func which should bring higher performance than last clumpy version

* fix typo