p33: Add user-space virtual memory lifecycle utilities#352
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s-p-1 wants to merge 2 commits intocodenet:p31-umallocfrom
Open
p33: Add user-space virtual memory lifecycle utilities#352s-p-1 wants to merge 2 commits intocodenet:p31-umallocfrom
s-p-1 wants to merge 2 commits intocodenet:p31-umallocfrom
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Objective
This branch introduces the fundamental user-space page table lifecycle utilities (
inituvm,allocuvm,deallocuvm, andfreevm) in strict parity withxv6-public. It also adds thepgdirpointer tostruct proc.Changes Made
proc.h: Addedpde_t* pgdir;tostruct proc(currently unused in runtime, added for structural parity).mmu.h: AddedPGADDRmacro required bydeallocuvm.vm.c: Appended the four user-space memory functions. Replaced the temporarykfreeinsetupkvm's error path with the now-availablefreevm.defs.h: Added respective function prototypes.Architectural Note: KERNBASE
In this branch, these functions act purely as structural scaffolding and are not yet executed. Because the OS has not yet migrated to a high-half kernel memory model,
KERNBASEevaluates to0. Consequently, the bounds checkif(newsz >= KERNBASE)inallocuvmwill currently reject any memory growth. These functions will become runtime-active once paging is fully enabled andKERNBASEis shifted to0x80000000in a subsequent branch.