os-k/kaleid/kernel/mm/malloc.c

//----------------------------------------------------------------------------//
//                           GNU GPL OS/K                                     //
//                                                                            //
//  Desc:       Early and very dumb memory managment                          //
//                                                                            //
//                                                                            //
//  Copyright © 2018-2019 The OS/K Team                                       //
//                                                                            //
//  This file is part of OS/K.                                                //
//                                                                            //
//  OS/K is free software: you can redistribute it and/or modify              //
//  it under the terms of the GNU General Public License as published by      //
//  the Free Software Foundation, either version 3 of the License, or         //
//  any later version.                                                        //
//                                                                            //
//  OS/K 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 General Public License for more details.                              //
//                                                                            //
//  You should have received a copy of the GNU General Public License         //
//  along with OS/K.  If not, see <https://www.gnu.org/licenses/>.            //
//----------------------------------------------------------------------------//

#include <kernel/heap.h>
#include <extras/malloc.h>

error_t KalAllocMemory(void **ptr, size_t req)
{
    return KalAllocMemoryEx(ptr, req, 0, 0);
}

error_t KalAllocMemoryEx(void **ptr, size_t req, int flags, size_t align)
{
    error_t rc;
    size_t brk;
    extern void *_heap_start;

    if (align == 0) align = M_DEFAULT_ALIGNMENT;

    if (align < M_MINIMAL_ALIGNMENT) {
        return EALIGN;
    }

    MmLockHeap();

    brk = (size_t)_heap_start + MmGetHeapSize();
    req = _ALIGN_UP(req + brk, align) - brk;

    rc = MmGrowHeap(req);

    MmUnlockHeap();

    if (rc) {
        if ((flags & M_CANFAIL) != 0)
            return rc;
        KeStartPanic("KalAllocMemory: Out of memory");
    }

    if (flags & M_ZEROED) {
        memzero(*ptr, req);
    }

    *ptr = (void *)brk;

    assert(*ptr);
    return rc;
}

//
// Frees allocated memory
//
error_t KalFreeMemory(void *ptr)
{
    (void)ptr;
    return EOK;
}