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/* $OpenBSD: alloc.c,v 1.4 1997/02/06 23:44:55 rahnds Exp $ */
/* $NetBSD: alloc.c,v 1.1 1996/09/30 16:35:00 ws Exp $ */
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 1996 TooLs GmbH.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Substitute alloc.c for Openfirmware machines
*/
#include <sys/param.h>
#include <openfirm.h>
#include <stand.h>
/*
* al tracks the allocated regions, fl tracks the free list
*/
struct ml {
struct ml *next;
unsigned int size;
} *al, *fl;
void *
alloc(size)
unsigned size;
{
struct ml **fp, *f;
unsigned rsz;
size = ALIGN(size) + ALIGN(sizeof(struct ml));
for (fp = &fl; f = *fp; fp = &f->next)
if (f->size >= size)
break;
if (!f) {
rsz = roundup(size, NBPG);
f = OF_claim(0, rsz, NBPG);
if (f == (void *)-1)
panic("alloc");
f->size = rsz;
} else {
*fp = f->next;
if (f->size > roundup(size, NBPG)) {
/* if the buffer is larger than necessary, split it */
/* still rounding to page size */
struct ml *f1;
f1 = (struct ml *)((u_int)f + roundup(size, NBPG));
f1->size = f->size - roundup(size, NBPG);
f->size = roundup(size, NBPG);
/* put the unused portion back on free list */
f1->next = fl;
fl = f1;
}
}
f->next = al;
al = f;
return (void *)f + ALIGN(sizeof(struct ml));
}
void
free(ptr, size)
void *ptr;
unsigned size;
{
struct ml *f = (struct ml *)(ptr - ALIGN(sizeof(struct ml)));
#if IGNORE_FOR_NOW
if (f->size != roundup(ALIGN(size) + ALIGN(sizeof(struct ml)), NBPG))
panic("free: wrong size (%x != %x)",
f->size,
roundup(ALIGN(size) + ALIGN(sizeof(struct ml)), NBPG));
#endif
f->next = fl;
fl = f;
}
void
freeall()
{
#ifdef __notyet__ /* looks like there is a bug in Motorola OFW */
struct ml *m1, *m2;
for (m1 = fl; m1; m1 = m2) {
m2 = m1->next;
OF_release(m1, m1->size);
}
for (m1 = al; m1; m1 = m2) {
m2 = m1->next;
OF_release(m1, m1->size);
}
#endif
}
#ifdef __notdef__
#ifdef FIREPOWERBUGS
/*
* Since firmware insists on running virtual, we manage memory ourselves,
* hoping that OpenFirmware will not need extra memory.
* (But then, the callbacks don't work anyway).
*/
#define OFMEM_REGIONS 32
static struct {
u_int start;
u_int size;
} OFavail[OFMEM_REGIONS];
void *
OF_claim(virt, size, align)
void *virt;
u_int size, align;
{
static int init;
int i;
u_int addr = -1;
if (!init) {
int phandle;
init = 1;
if ((phandle = OF_finddevice("/memory")) == -1
|| OF_getprop(phandle, "available",
OFavail, sizeof OFavail) <= 0)
return (void *)-1;
}
if (align) {
/* Due to the above, anything is page aligned here */
for (i = 0; i < OFMEM_REGIONS; i++) {
if (!OFavail[i].size)
break;
if (OFavail[i].size > size) {
addr = OFavail[i].start;
OFavail[i].start += size;
OFavail[i].size -= size;
break;
}
}
} else {
addr = (u_int)virt;
for (i = 0; i < OFMEM_REGIONS; i++) {
if (!OFavail[i].size) {
addr = -1;
break;
}
if (OFavail[i].start <= addr
&& addr + size - OFavail[i].start <= OFavail[i].size) {
/* Be lazy here, just cut off anything below addr */
size += addr - OFavail[i].start;
OFavail[i].start += size;
OFavail[i].size -= size;
break;
}
}
}
return (void *)addr;
}
/* Since this is called solely immediately before chain, we ignore it. */
void
OF_release(virt, size)
void *virt;
u_int size;
{
}
#endif /* FIREPOWERBUGS */
#endif
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