arch/all-native/kernel/kernel_bootmem.c

   1 /*
   2     Copyright © 1995-2014, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 /*
   7  * Boot-time memory management functions.
   8  * This is a very simple allocator working on a continuous memory block.
   9  * Its purpose is to help to set up initial boot-time data for your kernel,
  10  * until it can do more serious thing.
  11  * A popular usage is to store away boot information.
  12  */
  13
  14 #include <aros/macros.h>
  15 #include <string.h>
  16
  17 #include "kernel_base.h"
  18 #include "kernel_bootmem.h"
  19 #include "kernel_debug.h"
  20
  21 void *krnAllocBootMem(unsigned long size)
  22 {
  23     return krnAllocBootMemAligned(size, sizeof(void *));
  24 }
  25
  26 void *krnAllocBootMemAligned(unsigned long size, unsigned int align)
  27 {
  28     void *addr = (void *)AROS_ROUNDUP2((unsigned long)BootMemPtr, align);
  29     void *end = addr + size;
  30
  31 #ifdef __x86_64__
  32     /* FIXME: Only x86-64 currently sets BootMemLimit */
  33     if (end > BootMemLimit)
  34     {
  35         /* Our allocation must succeed. We can't continue without it. */
  36         krnPanic(NULL, "Not enough memory for boot information\n"
  37                        "Increase reserved space in bootstrap");
  38     }
  39 #endif
  40
  41     BootMemPtr = end;
  42     /* Clear the allocated memory. In many places we expect it. */
  43     memset(addr, 0, size);
  44
  45     return addr;
  46 }
  47
  48 void *BootMemPtr;
  49 void *BootMemLimit;