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, valloc_flags allocflags, vm_flags flags)
	Allocate zero-on-demand pages at a specific address.

Variables
static phyframe_t *	_zero_page = NULL

Function Documentation

zero_page()

static 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()

static 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,
		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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Variable Documentation

_zero_page

phyframe_t* _zero_page = NULL

static

Definition at line 21 of file cow.cpp.

Referenced by zero_page().