/* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
/* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */

/* Copyright (C) 2014 Stony Brook University
   This file is part of Graphene Library OS.

   Graphene Library OS is free software: you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public License
   as published by the Free Software Foundation, either version 3 of the
   License, or (at your option) any later version.

   Graphene Library OS is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/*
 * db_memory.c
 *
 * This files contains APIs that allocate, free or protect virtual memory.
 */

#include "pal_defs.h"
#include "pal.h"
#include "pal_internal.h"
#include "pal_error.h"
#include "pal_debug.h"
#include "api.h"

PAL_PTR
DkVirtualMemoryAlloc (PAL_PTR addr, PAL_NUM size, PAL_FLG alloc_type,
                      PAL_FLG prot)
{
    ENTER_PAL_CALL(DkVirtualMemoryAlloc);
    void * map_addr = (void *) addr;

    if ((addr && !ALLOC_ALIGNED(addr)) || !size || !ALLOC_ALIGNED(size)) {
        _DkRaiseFailure(PAL_ERROR_INVAL);
        LEAVE_PAL_CALL_RETURN((PAL_PTR) NULL);
    }

    if (map_addr && _DkCheckMemoryMappable((void *) map_addr, size)) {
        _DkRaiseFailure(PAL_ERROR_DENIED);
        LEAVE_PAL_CALL_RETURN((PAL_PTR) NULL);
    }

    int ret = _DkVirtualMemoryAlloc(&map_addr, size, alloc_type, prot);

    if (ret < 0) {
        _DkRaiseFailure(-ret);
        map_addr = NULL;
    }

    LEAVE_PAL_CALL_RETURN((PAL_PTR) map_addr);
}

void
DkVirtualMemoryFree (PAL_PTR addr, PAL_NUM size)
{
    ENTER_PAL_CALL(DkVirtualMemoryFree);

    if (!addr || !size) {
        _DkRaiseFailure(PAL_ERROR_INVAL);
        LEAVE_PAL_CALL();
    }

    if (!ALLOC_ALIGNED(addr) || !ALLOC_ALIGNED(size)) {
        _DkRaiseFailure(PAL_ERROR_INVAL);
        LEAVE_PAL_CALL();
    }

    if (_DkCheckMemoryMappable((void *) addr, size)) {
        _DkRaiseFailure(PAL_ERROR_DENIED);
        LEAVE_PAL_CALL();
    }

    int ret = _DkVirtualMemoryFree((void *) addr, size);

    if (ret < 0) {
        _DkRaiseFailure(-ret);
    }

    LEAVE_PAL_CALL();
}

PAL_BOL
DkVirtualMemoryProtect (PAL_PTR addr, PAL_NUM size, PAL_FLG prot)
{
    ENTER_PAL_CALL(DkVirtualMemoryProtect);

    if (!addr || !size) {
        _DkRaiseFailure(PAL_ERROR_INVAL);
        LEAVE_PAL_CALL_RETURN(PAL_FALSE);
    }

    if (!ALLOC_ALIGNED((void *) addr) || !ALLOC_ALIGNED(size)) {
        _DkRaiseFailure(PAL_ERROR_INVAL);
        LEAVE_PAL_CALL_RETURN(PAL_FALSE);
    }

    if (_DkCheckMemoryMappable((void *) addr, size)) {
        _DkRaiseFailure(PAL_ERROR_DENIED);
        LEAVE_PAL_CALL_RETURN(PAL_FALSE);
    }

    int ret = _DkVirtualMemoryProtect((void *) addr, size, prot);

    if (ret < 0) {
        _DkRaiseFailure(-ret);
        LEAVE_PAL_CALL_RETURN(PAL_FALSE);
    }

    LEAVE_PAL_CALL_RETURN(PAL_TRUE);
}