arch/all-native/kernel/kernel_bootmem.c

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