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/*
* RES_CORE.C - Resource ownership class, implementation
*
* as defined here, a resource has a class and an id (value). one ULONG
* of data may be attached to a resource.
*
* objects create a reference (handle) to the resource using res_create
* and free it using res_destroy. multiple objects may create references
* to the same object.
*
* ownership is aquired using res_own and released using res_unown. if
* an object already owns a resource, it may own it again (class keeps
* a refrence count). if an object (thread) asks for ownership of an
* already owned resource, if is suspended (using NdisAquireSpinLock)
*/
#include <ndis.h>
#include <ndiswan.h>
#include <mydefs.h>
#include <mytypes.h>
#include <util.h>
#include <adapter.h>
#include <idd.h>
#include <cm.h>
#include <mtl.h>
#include <res.h>
#include <disp.h>
/* system limits */
#define MAX_RES 128
/* assists */
//#define LOCK NdisAcquireSpinLock(&res__lock)
//#define UNLOCK NdisReleaseSpinLock(&res__lock)
/* global variables */
NDIS_SPIN_LOCK res__lock; /* management lock */
RES *res__tbl;
/* initialize support */
INT
res_init(VOID)
{
NDIS_PHYSICAL_ADDRESS pa = NDIS_PHYSICAL_ADDRESS_CONST(-1, -1);
/* allocate memory object */
NdisAllocateMemory((PVOID*)&res__tbl, (sizeof(RES) * MAX_RES), 0, pa);
if ( !res__tbl )
{
D_LOG(D_ALWAYS, ("res_init: memory allocate failed!"));
return(RES_E_NOMEM);
}
D_LOG(D_ALWAYS, ("res_init: res__tbl: 0x%lx", res__tbl));
NdisZeroMemory (res__tbl, sizeof(RES) * MAX_RES);
// NdisAllocateSpinLock(&res__lock);
return(RES_E_SUCC);
}
/* terminate support */
VOID
res_term(VOID)
{
// DbgPrint ("Resource Term: Entry\n");
// NdisFreeSpinLock(&res__lock);
/* free memory */
NdisFreeMemory(res__tbl, (sizeof(RES) * MAX_RES), 0);
}
/* create a (refrence to a ) resource */
RES*
res_create(ULONG class, ULONG id)
{
RES *res;
INT n;
// LOCK;
// DbgPrint ("Resource Create: class: 0x%x, id: 0x%x\n",class, id);
// DbgPrint ("IRQL: 0x%x\n",KeGetCurrentIrql());
/* scan for a matching slot */
for ( n = 0 ; n < MAX_RES ; n++ )
{
res = res__tbl + n;
if ( res->cre_ref && (res->class == class) && (res->id == id) )
{
/* found an already existing resource */
// DbgPrint ("Resource Create: resource already exists!\n");
res->cre_ref++;
break;
}
}
/* if no such, try to create a new one */
if (n >= MAX_RES)
for ( n = 0 ; n < MAX_RES ; n++ )
{
res = res__tbl + n;
if ( !res->cre_ref )
{
// DbgPrint ("Resource Create: resource created!\n");
/* found a free slot, fill */
res->cre_ref++;
res->class = class;
res->id = id;
res->data = 0;
res->own_ref = 0;
NdisAllocateSpinLock(&res->lock);
/* init sema */
sema_init(&res->proc_sema);
break;
}
}
// UNLOCK;
// DbgPrint ("Resource Create exit: res: 0x%lx refcount: %d\n",res, res->cre_ref);
// DbgPrint (": IRQL: 0x%x\n",KeGetCurrentIrql());
return(res);
}
/* free (a refrence to) a resource, return 1 if really destroyed */
INT
res_destroy(VOID *res_1)
{
RES *res = (RES*)res_1;
INT really = 0;
// LOCK;
// DbgPrint ("Resource Destroy: Entry res: 0x%lx, refcount: %d\n",res, res->cre_ref);
// DbgPrint (": IRQL: 0x%x\n",KeGetCurrentIrql());
/* decrement refrence count, if down to zero, free */
res->cre_ref--;
if ( !res->cre_ref )
{
NdisFreeSpinLock(&res->lock);
sema_term (&res->proc_sema);
really = 1;
}
// UNLOCK;
// DbgPrint ("Resource Destroy: Exit\n");
// DbgPrint (": IRQL: 0x%x\n",KeGetCurrentIrql());
return(really);
}
/* establish owership for a resource */
VOID
res_own(VOID *res_1, VOID *owner)
{
RES *res = (RES*)res_1;
// LOCK;
// DbgPrint("res_own: enter, res: 0x%lx, owner: 0x%lx, owner ref: %d\n", res, res->owner, res->own_ref);
// DbgPrint (": IRQL: 0x%x\n",KeGetCurrentIrql());
/* if not owned, get it */
if ( !res->own_ref )
{
NdisAcquireSpinLock(&res->lock);
res->own_ref++;
res->owner = owner;
goto bye;
}
/* check if already owned by self */
if ( res->owner == owner )
goto bye;
/* else we have to wait for it */
// UNLOCK;
NdisAcquireSpinLock(&res->lock);
// LOCK;
/* no I have it, fill */
res->own_ref++;
res->owner = owner;
bye:
// UNLOCK;
// DbgPrint("res_own: exit, res: 0x%lx, owner: 0x%lx, owner ref: %d\n", res, res->owner, res->own_ref);
// DbgPrint (": IRQL: 0x%x\n",KeGetCurrentIrql());
return;
}
/* release ownership of a resource, it is assumed that owner is releasing */
VOID
res_unown(VOID *res_1, VOID *owner)
{
RES *res = (RES*)res_1;
// LOCK;
// DbgPrint("res_unown: entry, res: 0x%lx, owner: 0x%lx owner ref: %d\n", res, owner, res->own_ref);
// DbgPrint (": IRQL: 0x%x\n",KeGetCurrentIrql());
if (!res->own_ref)
{
/* if free, onwership released */
// UNLOCK;
return;
}
/* decrement ownership count, if not down to zero - still owned */
res->own_ref--;
if ( res->own_ref )
{
// UNLOCK;
return;
}
res->owner = NULL;
NdisReleaseSpinLock(&res->lock);
/* if free, onwership released */
// UNLOCK;
// DbgPrint("res_unown: exit, res: 0x%lx, owner ref: %d\n", res, res->own_ref);
// DbgPrint (": IRQL: 0x%x\n",KeGetCurrentIrql());
}
/* get private data for a resource */
VOID
res_get_data(VOID *res_1, ULONG *data)
{
RES *res = (RES*)res_1;
*data = res->data;
}
/* set private data for a resource */
VOID
res_set_data(VOID *res_1, ULONG data)
{
RES *res = (RES*)res_1;
res->data = data;
}
INT
GetResourceSem (VOID *Resource)
{
RES *res = (RES*)Resource;
if ( !sema_get(&res->proc_sema) )
return(RES_BUSY);
else
return(RES_FREE);
}
VOID
FreeResourceSem (VOID *Resource)
{
RES *res = (RES*)Resource;
sema_free(&res->proc_sema);
}
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