lscsa_alloc.c
1.59 KB
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/*
* SPU local store allocation routines
*
* Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#undef DEBUG
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <asm/spu.h>
#include <asm/spu_csa.h>
#include <asm/mmu.h>
#include "spufs.h"
int spu_alloc_lscsa(struct spu_state *csa)
{
struct spu_lscsa *lscsa;
unsigned char *p;
lscsa = vzalloc(sizeof(struct spu_lscsa));
if (!lscsa)
return -ENOMEM;
csa->lscsa = lscsa;
/* Set LS pages reserved to allow for user-space mapping. */
for (p = lscsa->ls; p < lscsa->ls + LS_SIZE; p += PAGE_SIZE)
SetPageReserved(vmalloc_to_page(p));
return 0;
}
void spu_free_lscsa(struct spu_state *csa)
{
/* Clear reserved bit before vfree. */
unsigned char *p;
if (csa->lscsa == NULL)
return;
for (p = csa->lscsa->ls; p < csa->lscsa->ls + LS_SIZE; p += PAGE_SIZE)
ClearPageReserved(vmalloc_to_page(p));
vfree(csa->lscsa);
}