refactor: Re-architecture

See merge request scuccs-cst-sra-group/loos!18

fix: devel-fsfixed

See merge request scuccs-cst-sra-group/loos!17

feat: add kmalloc for wrapper of kalloc; update proc.h and add vm.h for mapping struct; add clone_proc for clone preparation; modify exec.c to use struct mapping

See merge request scuccs-cst-sra-group/loos!16

feat: add kmalloc for wrapper of kalloc; update proc.h and add vm.h for mapping struct; add clone_proc for clone preparation; modify exec.c to use struct mapping

feat: delete hack kernel_context; instead of pid 0 kernel

See merge request scuccs-cst-sra-group/loos!15

feat: break proc.c into proc.c and exec.c; docs: add docs/syscall for ii-stage syscalls

See merge request scuccs-cst-sra-group/loos!14

feat: break proc.c into proc.c and exec.c, modify defs.h and proc.h to adjust it; fix issues of non-initialized inode_cnt in fs.c

feat: add flush tlb after return from switch

See merge request scuccs-cst-sra-group/loos!13

feat: adjust mappages and exec

See merge request scuccs-cst-sra-group/loos!12

feat: devel to main merge

See merge request scuccs-cst-sra-group/loos!11

feat: finish the preparation for merging with main

See merge request scuccs-cst-sra-group/loos!10

fix: devel fix compile errors

See merge request scuccs-cst-sra-group/loos!9

chores: reconstruct build system

See merge request scuccs-cst-sra-group/loos!8

chores: Main fix compiler message

See merge request scuccs-cst-sra-group/loos!5

chores: clean the dir to match specs; reconstruct build system

See merge request scuccs-cst-sra-group/loos!4

chores: update Makefile, scripts/loongarch64.mk, scripts/main.mk and tools/Makefile to add flexibility to project build system; rm kernel.bin, 1