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/**
 * @file
 *
 * Support library for the Zone Allocator.
 *
 * <hr>$Revision: 52004 $<hr>
 */


#include "cvmx-config.h"
#include "cvmx.h"
#include "cvmx-spinlock.h"
#include "cvmx-malloc.h"




#ifndef CVMX_BUILD_FOR_LINUX_USER
cvmx_zone_t cvmx_zone_create_from_addr(char *name, uint32_t elem_size, uint32_t num_elem,
                             void* mem_ptr, uint64_t mem_size, uint32_t flags)
{
    cvmx_zone_t zone;
    unsigned int i;

    if ((unsigned long)mem_ptr & (sizeof(void *) -1))
    {
        return(NULL);  //invalid alignment
    }
    if (mem_size  < sizeof(struct cvmx_zone) + elem_size * num_elem)
    {
        return(NULL);  // not enough room
    }

    zone = (cvmx_zone_t) ((char *)mem_ptr + elem_size * num_elem);
    zone->elem_size = elem_size;
    zone->num_elem = num_elem;
    zone->name = name;
    zone->align = 0;  // not used
    zone->baseptr = NULL;
    zone->freelist = NULL;
    zone->lock.value = CVMX_SPINLOCK_UNLOCKED_VAL;

    zone->baseptr = (char *)mem_ptr;

    for(i=0;i<num_elem;i++)
    {
        *(void **)(zone->baseptr + (i*elem_size)) = zone->freelist;
        zone->freelist = (void *)(zone->baseptr + (i*elem_size));
    }

    return(zone);

}

cvmx_zone_t cvmx_zone_create_from_arena(char *name, uint32_t elem_size, uint32_t num_elem, uint32_t align, cvmx_arena_list_t arena_list, uint32_t flags)
{
    unsigned int i;
    cvmx_zone_t zone;

    zone = (cvmx_zone_t)cvmx_malloc(arena_list, sizeof(struct cvmx_zone));

    if (NULL == zone)
    {
        return(NULL);
    }
    zone->elem_size = elem_size;
    zone->num_elem = num_elem;
    zone->name = name;
    zone->align = align;
    zone->baseptr = NULL;
    zone->freelist = NULL;
    zone->lock.value = CVMX_SPINLOCK_UNLOCKED_VAL;

    zone->baseptr = (char *)cvmx_memalign(arena_list, align, num_elem * elem_size);
    if (NULL == zone->baseptr)
    {
        return(NULL);
    }

    for(i=0;i<num_elem;i++)
    {
        *(void **)(zone->baseptr + (i*elem_size)) = zone->freelist;
        zone->freelist = (void *)(zone->baseptr + (i*elem_size));
    }

    return(zone);

}
#endif



void * cvmx_zone_alloc(cvmx_zone_t zone, uint32_t flags)
{
    cvmx_zone_t item;

    assert(zone != NULL);
    assert(zone->baseptr != NULL);
    cvmx_spinlock_lock(&zone->lock);

	item = (cvmx_zone_t)zone->freelist;
	if(item != NULL)
	{
		zone->freelist = *(void **)item;
	}
	else
	{
//		cvmx_dprintf("No more elements in zone %s\n", zone->name);
	}

    cvmx_spinlock_unlock(&zone->lock);
    return(item);
}

void cvmx_zone_free(cvmx_zone_t zone, void *ptr)
{

    assert(zone != NULL);
    assert(zone->baseptr != NULL);
    assert((unsigned long)ptr - (unsigned long)zone->baseptr < zone->num_elem * zone->elem_size);

    cvmx_spinlock_lock(&zone->lock);
	*(void **)ptr = zone->freelist;
	zone->freelist = ptr;
    cvmx_spinlock_unlock(&zone->lock);
}