cow.hpp File Reference

#include "mos/mm/mm.hpp"
#include "mos/mm/paging/paging.hpp"

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Functions
PtrResult< vmap_t >	cow_clone_vmap_locked (MMContext *target_mmctx, vmap_t *source_vmap)
	Copy-on-write a page range.
PtrResult< vmap_t >	cow_allocate_zeroed_pages (MMContext *handle, size_t npages, ptr_t vaddr, valloc_flags hints, vm_flags flags)
	Allocate zero-on-demand pages at a specific address.

Function Documentation

cow_clone_vmap_locked()

PtrResult< vmap_t > cow_clone_vmap_locked	(	MMContext *	target_mmctx,
		vmap_t *	source_vmap )

Copy-on-write a page range.

Parameters

target_mmctx	The mm context to copy to
source_vmap	The vmap to copy from

Returns

vmap_t* The new vmap, with the lock held

Definition at line 62 of file cow.cpp.

Referenced by process_do_fork().

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cow_allocate_zeroed_pages()

PtrResult< vmap_t > cow_allocate_zeroed_pages	(	MMContext *	handle,
		size_t	npages,
		ptr_t	vaddr,
		valloc_flags	hints,
		vm_flags	flags )

Allocate zero-on-demand pages at a specific address.

Parameters

handle	The paging handle to use
npages	The number of pages to allocate
vaddr	The virtual address to allocate at
hints	Allocation hints, see valloc_flags
flags	VM flags to use

Returns

vmblock_t The allocated block

Definition at line 81 of file cow.cpp.

Referenced by mmap_anonymous(), process_do_execveat(), and thread_new().

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