#include "memory.h"
#include "zone.h"
#include "jove.h"

void
pm_reserve(physptr_t start, physptr_t end)
{
    size_t zone = pm_zone_for(start);
    size_t limit = pm_zone_bound_upper(zone);

    if(end > limit) {
        pm_reserve(limit, end);
        end = limit;
    }
    pm_zone_resv(MEM_ZONE_STANDARD, start, end);
}

void 
pm_release(physptr_t start, physptr_t end)
{
    size_t zone = pm_zone_for(start);
    size_t limit = pm_zone_bound_upper(zone);

    if(end > limit) {
        pm_release(limit, end);
        end = limit;
    }
    pm_zone_free(MEM_ZONE_STANDARD, start, end);
}

physptr_t
pm_alloc(size_t pages)
{
    if(pm_zone_pages_free(MEM_ZONE_HIGHER) >= pages)
        return pm_zone_alloc(MEM_ZONE_HIGHER, pages);
    if(pm_zone_pages_free(MEM_ZONE_STANDARD) >= pages)
        return pm_zone_alloc(MEM_ZONE_STANDARD, pages);
    kpanic("Kernel ran out of physical memory!\n");
}