cow.cpp File Reference

#include "mos/mm/cow.hpp"
#include "mos/mm/mm.hpp"
#include "mos/mm/mmstat.hpp"
#include "mos/mm/paging/paging.hpp"
#include "mos/platform/platform.hpp"
#include <mos/interrupt/ipi.hpp>
#include <mos/mm/physical/pmm.hpp>
#include <mos/syslog/printk.hpp>
#include <mos/tasks/process.hpp>
#include <mos/tasks/task_types.hpp>
#include <mos/types.hpp>
#include <mos_string.hpp>

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Functions
static phyframe_t *	zero_page (void)
static vmfault_result_t	cow_zod_fault_handler (vmap_t *vmap, ptr_t fault_addr, pagefault_t *info)
PtrResult< vmap_t >	cow_clone_vmap_locked (MMContext *target_mmctx, vmap_t *src_vmap)
	Copy-on-write a page range.
PtrResult< vmap_t >	cow_allocate_zeroed_pages (MMContext *mmctx, size_t npages, ptr_t vaddr, VMFlags flags, bool exact)
	Allocate zero-on-demand pages at a specific address.

Variables
static phyframe_t *	_zero_page = NULL

Function Documentation

zero_page()

phyframe_t * zero_page ( void )

static

Definition at line 22 of file cow.cpp.

Referenced by cow_zod_fault_handler().

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cow_zod_fault_handler()

vmfault_result_t cow_zod_fault_handler ( vmap_t * vmap, ptr_t fault_addr, pagefault_t * info )

static

Definition at line 34 of file cow.cpp.

Referenced by cow_allocate_zeroed_pages(), and cow_clone_vmap_locked().

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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,
		VMFlags	flags,
		bool	exact = false )

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
flags	VM flags to use
exact	Allocation at the exact address

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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Variable Documentation

_zero_page

phyframe_t* _zero_page = NULL

static

Definition at line 21 of file cow.cpp.

Referenced by zero_page().