arch/x86_64/hal/obj.c


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#include "obj.h"
#include "arch/x86_64/lock.h"
#include "hal/obj.h"
#include "jove.h"

jove_owned_obj_t*
obj_take(jove_obj_t *obj)
{
    take_mutex(&obj->lock);
    return (jove_owned_obj_t*)obj;
}

jove_obj_t*
obj_release(jove_owned_obj_t *obj)
{
    release_mutex((atomic_flag*)&obj->lock);
    return (jove_obj_t*)obj;
}

void*
obj_deref(jove_owned_obj_t *obj)
{
    return (void*)(((uintptr_t)obj_getvalue(obj)) | 0xFFFF800000000000ULL);
}

uint8_t
obj_gettype(jove_owned_obj_t *obj)
{
    return obj->type;
}

void
obj_settype(jove_owned_obj_t *obj, uint8_t type)
{
    obj->type = type;
}

uintmax_t
obj_getvalue(jove_owned_obj_t *obj)
{
    return obj->value;
}

void
obj_setvalue(jove_owned_obj_t *obj, uintmax_t value)
{
    obj->value = value & 0x00007FFFFFFFFFFFULL;
}

jove_obj_t*
objdir_getlocal(
        jove_owned_obj_t *objdir_obj, 
        uint16_t entry)
{
    if(objdir_obj->type != JOVE_OBJ_OBJDIR) {
        reterr(EBADOBJ);
    }
    if(entry >= JOVE_OBJDIR_ENTRIES) {
        reterr(EOOB);
    }

    jove_objdir_t *objtab = obj_deref(objdir_obj);
    return &objtab->entries[entry];
}

jove_owned_obj_t*
objdir_getobj(
        jove_owned_obj_t *objdir_obj, 
        const uint16_t *path, 
        size_t path_len)
{
    if(path_len == 0) {
        return objdir_obj;
    }
    {
        jove_obj_t *child_locked_objdir = objdir_getlocal(objdir_obj, path[0]);
        if(child_locked_objdir == NULL) {
            return 0;
        }

        jove_owned_obj_t *child_objdir = obj_take(child_locked_objdir);
        jove_owned_obj_t *target_obj = objdir_getobj(child_objdir, path + 1, path_len - 1);
        obj_release(child_objdir);
        return target_obj;
    }
}