Segment driver. More...

#include <vm.h>

Data Fields
struct vm_segment (	vm_alloc )(struct address_space *, vaddr_t, size_t, vm_flags_t)
	Allocate a segment of virtual memory. More...

struct vm_segment (	vm_alloc_at )(struct address_space *, paddr_t, size_t, vm_flags_t)
	Allocate a segment of virtual memory mapped to a physical address. More...

void(*	vm_free )(struct address_space , struct vm_segment )
	Free a contiguous virtual memory segment. More...

error_t(*	vm_resize )(struct address_space , struct vm_segment , size_t)
	Resize a virtual memory segment. More...

error_t(*	vm_fault )(struct address_space , struct vm_segment )
	Handle a page fault exception on a known segment. More...

Detailed Description

There exists different types of memory segments. A segment driver defines the operations that can be performed on a segment (allocating, freeing).

Field Documentation

struct vm_segment *(* vm_segment_driver::vm_alloc) (struct address_space *, vaddr_t, size_t, vm_flags_t)

Parameters

as	The address space this segment belongs to
start	If specified, the segment should start at this address
size	The size of the segment

struct vm_segment *(* vm_segment_driver::vm_alloc_at) (struct address_space *, paddr_t, size_t, vm_flags_t)

Parameters

as	The address space this segment belongs to
start	Start of the physical address range
size	The size of the segment

Note: This function assumes that the physical address range is contiguous and large enough to contain size bytes.

error_t(* vm_segment_driver::vm_fault) (struct address_space *, struct vm_segment *)

Parameters

as	The address space the segment belongs to
segment	The memory segment inside which the faulty address is located.

void(* vm_segment_driver::vm_free) (struct address_space *, struct vm_segment *)

This function is also responsible for freeing the physical backing storage (pmm_free), and removing any eventual MMU entries.

error_t(* vm_segment_driver::vm_resize) (struct address_space *, struct vm_segment *, size_t)

When expanding, if the required virtual memory range has already been allocated, this function returns E_NOMEM.

Calling this function with a size of 0 is equivalent to vm_free().

Parameters

size	The new size of the segment

The documentation for this struct was generated from the following file: