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#include "globals.h"
#include "mm/pframe.h"
#include "mm/slab.h"
#include "util/debug.h"
#include "util/string.h"
static slab_allocator_t *pframe_allocator;
void pframe_init()
{
pframe_allocator = slab_allocator_create("pframe", sizeof(pframe_t));
KASSERT(pframe_allocator);
}
/*
* Create a pframe and initialize its members appropriately.
*/
pframe_t *pframe_create()
{
pframe_t *pf = slab_obj_alloc(pframe_allocator);
if (!pf)
{
return NULL;
}
memset(pf, 0, sizeof(pframe_t));
kmutex_init(&pf->pf_mutex);
list_link_init(&pf->pf_link);
return pf;
}
/*
* Free the pframe (don't forget to unlock the mutex) and set *pfp = NULL
*
* The pframe must be locked, its contents not in memory (pf->pf_addr == NULL),
* have a pincount of 0, and not be linked into a memory object's list.
*/
void pframe_free(pframe_t **pfp)
{
KASSERT(kmutex_owns_mutex(&(*pfp)->pf_mutex));
KASSERT(!(*pfp)->pf_addr);
KASSERT(!(*pfp)->pf_dirty);
KASSERT(!list_link_is_linked(&(*pfp)->pf_link));
kmutex_unlock(&(*pfp)->pf_mutex);
slab_obj_free(pframe_allocator, *pfp);
*pfp = NULL;
}
/*
* Unlock the pframe and set *pfp = NULL
*/
void pframe_release(pframe_t **pfp)
{
pframe_t *pf = *pfp;
KASSERT(kmutex_owns_mutex(&pf->pf_mutex));
*pfp = NULL;
kmutex_unlock(&pf->pf_mutex);
}
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