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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2010 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#if defined(_UWIN) && defined(_BLD_ast)
void _STUB_vmopen(){}
#else
#include "vmhdr.h"
/* Opening a new region of allocation.
** Note that because of possible exotic memory types,
** all region data must be stored within the space given
** by the discipline.
**
** Written by Kiem-Phong Vo, kpv@research.att.com, 01/16/94.
*/
typedef struct _vminit_
{
Vmdata_t vd; /* space for the region itself */
Seg_t seg; /* space for segment */
Block_t block; /* space for a block */
Head_t head; /* space for the fake header */
char a[3*ALIGN]; /* extra to fuss with alignment */
} Vminit_t;
#if __STD_C
Vmalloc_t* vmopen(Vmdisc_t* disc, Vmethod_t* meth, int mode)
#else
Vmalloc_t* vmopen(disc, meth, mode)
Vmdisc_t* disc; /* discipline to get segments */
Vmethod_t* meth; /* method to manage space */
int mode; /* type of region */
#endif
{
reg Vmalloc_t* vm;
reg Vmdata_t* vd;
reg size_t s, a, incr;
reg Block_t* b;
reg Seg_t* seg;
Vmuchar_t* addr;
reg Vmemory_f memoryf;
reg int e;
if(!meth || !disc || !(memoryf = disc->memoryf) )
return NIL(Vmalloc_t*);
GETPAGESIZE(_Vmpagesize);
/* note that Vmalloc_t space must be local to process since that's
where the meth&disc function addresses are going to be stored */
if(!(vm = (Vmalloc_t*)vmalloc(Vmheap,sizeof(Vmalloc_t))) )
return NIL(Vmalloc_t*);
vm->meth = *meth;
vm->disc = disc;
vm->file = NIL(char*);
vm->line = 0;
if(disc->exceptf)
{ addr = NIL(Vmuchar_t*);
if((e = (*disc->exceptf)(vm,VM_OPEN,(Void_t*)(&addr),disc)) != 0)
{ if(e < 0 || !addr)
goto open_error;
/* align this address */
if((a = (size_t)(VLONG(addr)%ALIGN)) != 0)
addr += ALIGN-a;
/* see if it's a valid region */
vd = (Vmdata_t*)addr;
if((vd->mode&meth->meth) != 0)
{ vm->data = vd;
goto done;
}
else
{ open_error:
vmfree(Vmheap,vm);
return NIL(Vmalloc_t*);
}
}
}
/* make sure vd->incr is properly rounded */
incr = disc->round <= 0 ? _Vmpagesize : disc->round;
incr = MULTIPLE(incr,ALIGN);
/* get space for region data */
s = ROUND(sizeof(Vminit_t),incr);
if(!(addr = (Vmuchar_t*)(*memoryf)(vm,NIL(Void_t*),0,s,disc)) )
{ vmfree(Vmheap,vm);
return NIL(Vmalloc_t*);
}
/* make sure that addr is aligned */
if((a = (size_t)(VLONG(addr)%ALIGN)) != 0)
addr += ALIGN-a;
/* initialize region */
vd = (Vmdata_t*)addr;
vd->mode = (mode&VM_FLAGS) | meth->meth;
vd->incr = incr;
vd->pool = 0;
vd->free = vd->wild = NIL(Block_t*);
if(vd->mode&(VM_TRACE|VM_MTDEBUG))
vd->mode &= ~VM_TRUST;
if(vd->mode&(VM_MTBEST|VM_MTDEBUG|VM_MTPROFILE))
{ vd->root = NIL(Block_t*);
for(e = S_TINY-1; e >= 0; --e)
TINY(vd)[e] = NIL(Block_t*);
for(e = S_CACHE; e >= 0; --e)
CACHE(vd)[e] = NIL(Block_t*);
incr = sizeof(Vmdata_t);
}
else incr = OFFSET(Vmdata_t,root);
vd->seg = (Seg_t*)(addr + ROUND(incr,ALIGN));
/**/ ASSERT(VLONG(vd->seg)%ALIGN == 0);
seg = vd->seg;
seg->next = NIL(Seg_t*);
seg->vmdt = vd;
seg->addr = (Void_t*)(addr - (a ? ALIGN-a : 0));
seg->extent = s;
seg->baddr = addr + s - (a ? ALIGN : 0);
seg->size = s; /* this size is larger than usual so that the segment
will not be freed until the region is closed. */
seg->free = NIL(Block_t*);
/* make a data block out of the remainder */
b = SEGBLOCK(seg);
SEG(b) = seg;
SIZE(b) = seg->baddr - (Vmuchar_t*)b - 2*sizeof(Head_t);
*SELF(b) = b;
/**/ ASSERT(SIZE(b)%ALIGN == 0);
/**/ ASSERT(VLONG(b)%ALIGN == 0);
/* make a fake header for next block in case of noncontiguous segments */
SEG(NEXT(b)) = seg;
SIZE(NEXT(b)) = BUSY|PFREE;
if(vd->mode&(VM_MTLAST|VM_MTPOOL))
seg->free = b;
else vd->wild = b;
vm->data = vd;
done: /* add to the linked list of regions */
vm->next = Vmheap->next;
Vmheap->next = vm;
return vm;
}
#endif
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