HelenOS sources
This source file includes following definitions.
- phys_create
- phys_share
- phys_destroy
- phys_is_resizable
- phys_is_shareable
- phys_page_fault
- phys_create_shared_data
- phys_destroy_shared_data
#include <assert.h>
#include <ddi/ddi.h>
#include <typedefs.h>
#include <mm/as.h>
#include <mm/page.h>
#include <mm/frame.h>
#include <stdlib.h>
#include <macros.h>
#include <arch.h>
#include <align.h>
static bool phys_create(as_area_t *);
static void phys_share(as_area_t *);
static void phys_destroy(as_area_t *);
static bool phys_is_resizable(as_area_t *);
static bool phys_is_shareable(as_area_t *);
static int phys_page_fault(as_area_t *, uintptr_t, pf_access_t);
static bool phys_create_shared_data(as_area_t *);
static void phys_destroy_shared_data(void *);
typedef struct {
uintptr_t base;
size_t frames;
} phys_shared_data_t;
mem_backend_t phys_backend = {
.create = phys_create,
.resize = NULL,
.share = phys_share,
.destroy = phys_destroy,
.is_resizable = phys_is_resizable,
.is_shareable = phys_is_shareable,
.page_fault = phys_page_fault,
.frame_free = NULL,
.create_shared_data = phys_create_shared_data,
.destroy_shared_data = phys_destroy_shared_data
};
bool phys_create(as_area_t *area)
{
return true;
}
void phys_share(as_area_t *area)
{
assert(mutex_locked(&area->as->lock));
assert(mutex_locked(&area->lock));
}
void phys_destroy(as_area_t *area)
{
if (area->backend_data.parea != NULL)
ddi_parea_unmap_notify(area->backend_data.parea);
}
bool phys_is_resizable(as_area_t *area)
{
return false;
}
bool phys_is_shareable(as_area_t *area)
{
return true;
}
int phys_page_fault(as_area_t *area, uintptr_t upage, pf_access_t access)
{
uintptr_t base = area->backend_data.base;
assert(page_table_locked(AS));
assert(mutex_locked(&area->lock));
assert(IS_ALIGNED(upage, PAGE_SIZE));
if (!as_area_check_access(area, access))
return AS_PF_FAULT;
assert(upage - area->base < area->backend_data.frames * FRAME_SIZE);
page_mapping_insert(AS, upage, base + (upage - area->base),
as_area_get_flags(area));
if (!used_space_insert(&area->used_space, upage, 1))
panic("Cannot insert used space.");
return AS_PF_OK;
}
bool phys_create_shared_data(as_area_t *area)
{
if (area->backend_data.anonymous) {
phys_shared_data_t *data;
data = (phys_shared_data_t *) malloc(sizeof(*data));
if (!data)
return false;
data->base = area->backend_data.base;
data->frames = area->backend_data.frames;
area->sh_info->backend_shared_data = data;
}
return true;
}
void phys_destroy_shared_data(void *opaque_data)
{
phys_shared_data_t *data = (phys_shared_data_t *) opaque_data;
if (data) {
frame_free(data->base, data->frames);
free(data);
}
}
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