platform/msm_shared/smem.c

/*
 * Copyright (c) 2009, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 THE
 * COPYRIGHT OWNER OR CONTRIBUTORS 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.
 */

#include <debug.h>
#include <reg.h>
#include <sys/types.h>
#include <platform/iomap.h>

#include "smem.h"

static struct smem *smem = (void *)(MSM_SHARED_BASE);

/* buf MUST be 4byte aligned, and len MUST be a multiple of 4. */
unsigned smem_read_alloc_entry(smem_mem_type_t type, void *buf, int len)
{
	struct smem_alloc_info *ainfo;
	unsigned *dest = buf;
	unsigned src;
	unsigned size;

	if (((len & 0x3) != 0) || (((unsigned)buf & 0x3) != 0))
		return 1;

	if (type < SMEM_FIRST_VALID_TYPE || type > SMEM_LAST_VALID_TYPE)
		return 1;

	/* TODO: Use smem spinlocks */
	ainfo = &smem->alloc_info[type];
	if (readl(&ainfo->allocated) == 0)
		return 1;

	if ((size = readl(&ainfo->size)) != (unsigned)len)
		return 1;

	src = MSM_SHARED_BASE + readl(&ainfo->offset);
	for (; size > 0; src += 4, size -= 4)
		*(dest++) = readl(src);

	return 0;
}