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os-common.c

/*
 * This software is part of the SBCL system. See the README file for
 * more information.
 *
 * This software is derived from the CMU CL system, which was
 * written at Carnegie Mellon University and released into the
 * public domain. The software is in the public domain and is
 * provided with absolutely no warranty. See the COPYING and CREDITS
 * files for more information.
 */

#include <stdio.h>
#include <errno.h>
#include <string.h>

#include "sbcl.h"
#include "os.h"
#include "interr.h"

/* Except for os_zero, these routines are only called by Lisp code.
 * These routines may also be replaced by os-dependent versions
 * instead. See hpux-os.c for some useful restrictions on actual
 * usage. */

void
os_zero(os_vm_address_t addr, os_vm_size_t length)
{
    os_vm_address_t block_start;
    os_vm_size_t block_size;

#ifdef DEBUG
    fprintf(stderr,";;; os_zero: addr: 0x%08x, len: 0x%08x\n",addr,length);
#endif

    block_start = os_round_up_to_page(addr);

    length -= block_start-addr;
    block_size = os_trunc_size_to_page(length);

    if (block_start > addr)
      bzero((char *)addr, block_start-addr);
    if (block_size < length)
      bzero((char *)block_start+block_size, length-block_size);

    if (block_size != 0) {
      /* Now deallocate and allocate the block so that it faults in
       * zero-filled. */

      os_invalidate(block_start, block_size);
      addr = os_validate(block_start, block_size);

      if (addr == NULL || addr != block_start)
          lose("os_zero: block moved! 0x%08x ==> 0x%08x",
             block_start,
             addr);
    }
}

os_vm_address_t
os_allocate(os_vm_size_t len)
{
    return os_validate((os_vm_address_t)NULL, len);
}

os_vm_address_t
os_allocate_at(os_vm_address_t addr, os_vm_size_t len)
{
    return os_validate(addr, len);
}

void
os_deallocate(os_vm_address_t addr, os_vm_size_t len)
{
    os_invalidate(addr,len);
}

/* (This function once tried to grow the chunk by asking os_validate
 * whether the space was available, but that really only works under
 * Mach.) */
os_vm_address_t
os_reallocate(os_vm_address_t addr, os_vm_size_t old_len, os_vm_size_t len)
{
    addr=os_trunc_to_page(addr);
    len=os_round_up_size_to_page(len);
    old_len=os_round_up_size_to_page(old_len);

    if (addr==NULL)
      return os_allocate(len);
    else{
      long len_diff=len-old_len;

      if (len_diff<0)
          os_invalidate(addr+len,-len_diff);
      else{
          if (len_diff!=0) {
            os_vm_address_t new=os_allocate(len);

            if(new!=NULL){
            bcopy(addr,new,old_len);
            os_invalidate(addr,old_len);
            }
            
            addr=new;
          }
      }
      return addr;
    }
}

int
os_get_errno(void)
{
    return errno;
}

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