rom/exec/addmemlist.c

   1 /*
   2     Copyright © 1995-2012, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Add memory to the public list of memory.
   6     Lang: english
   7 */
   8
   9 #include <aros/debug.h>
  10 #include <exec/execbase.h>
  11 #include <aros/libcall.h>
  12 #include <exec/memory.h>
  13 #include <proto/exec.h>
  14
  15 #include "exec_intern.h"
  16 #include "memory.h"
  17
  18 /*****************************************************************************
  19
  20     NAME */
  21
  22         AROS_LH5(void, AddMemList,
  23
  24 /*  SYNOPSIS */
  25         AROS_LHA(IPTR,   size,       D0),
  26         AROS_LHA(ULONG,  attributes, D1),
  27         AROS_LHA(LONG,   pri,        D2),
  28         AROS_LHA(APTR,   base,       A0),
  29         AROS_LHA(STRPTR, name,       A1),
  30
  31 /*  LOCATION */
  32         struct ExecBase *, SysBase, 103, Exec)
  33
  34 /*  FUNCTION
  35         Add a new block of memory to the system memory lists.
  36
  37     INPUTS
  38         size       - Size of the block
  39         attributes - The attributes the memory will have
  40         pri        - Priority in the list of MemHeaders
  41         base       - Base address
  42         name       - A name associated with the memory
  43
  44     RESULT
  45
  46     NOTES
  47         No argument checking done.
  48
  49     EXAMPLE
  50
  51     BUGS
  52
  53     SEE ALSO
  54
  55     INTERNALS
  56
  57 ******************************************************************************/
  58 {
  59     AROS_LIBFUNC_INIT
  60
  61     struct MemHeader *mh;
  62
  63     /* If the end is less than (1 << 31), MEMF_31BIT is implied */
  64     if (((IPTR)base+size) < (1UL << 31))
  65         attributes |= MEMF_31BIT;
  66     else
  67         attributes &= ~MEMF_31BIT;
  68
  69     /* Do I have to look here if it matches some other MemHeader? */
  70     mh=(struct MemHeader *)base;
  71     mh->mh_Node.ln_Type=NT_MEMORY;
  72     mh->mh_Node.ln_Pri=pri;
  73     mh->mh_Node.ln_Name=name;
  74     mh->mh_Attributes=attributes;
  75     mh->mh_First=(struct MemChunk *)((UBYTE *)mh+MEMHEADER_TOTAL);
  76     mh->mh_First->mc_Next=NULL;
  77     mh->mh_First->mc_Bytes=size-MEMHEADER_TOTAL;
  78     mh->mh_Lower=mh->mh_First;
  79     mh->mh_Upper=(APTR)((UBYTE *)base+size);
  80     mh->mh_Free=mh->mh_First->mc_Bytes;
  81
  82     /* Protect the memory list. */
  83     MEM_LOCK;
  84
  85     /* Add MemHeader */
  86     Enqueue(&SysBase->MemList,&mh->mh_Node);
  87
  88     MEM_UNLOCK;
  89
  90     AROS_LIBFUNC_EXIT
  91 } /* AddMemList */
  92