/*
* Copyright (c) 2015 Petr Pavlu
* 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.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/** @addtogroup kernel_arm64_mm
* @{
*/
/** @file
* @brief Frame related functions.
*/
#include <arch/mm/frame.h>
#include <mm/frame.h>
#include <config.h>
#include <align.h>
#include <macros.h>
/** Physical memory map received from the bootcode. */
memmap_t memmap;
/** Print memory layout. */
void physmem_print(void)
{
printf("[base ] [size ] [type ]\n");
size_t i;
for (i = 0; i < memmap.cnt; i++) {
const char *type;
switch (memmap.zones[i].type) {
case MEMTYPE_AVAILABLE:
type = "available";
break;
case MEMTYPE_ACPI_RECLAIM:
type = "ACPI reclaim";
break;
default:
type = "unusable";
break;
}
printf("%p %#018zx %s\n", memmap.zones[i].start,
memmap.zones[i].size, type);
}
}
/** Create memory zones according to information stored in memmap.
*
* Walk the memory map and create frame zones according to it.
*/
static void frame_common_arch_init(bool low)
{
size_t i;
for (i = 0; i < memmap.cnt; i++) {
if (memmap.zones[i].type != MEMTYPE_AVAILABLE)
continue;
/* To be safe, make the available zone possibly smaller. */
uintptr_t base = ALIGN_UP((uintptr_t) memmap.zones[i].start,
FRAME_SIZE);
size_t size = ALIGN_DOWN(memmap.zones[i].size -
(base - (uintptr_t) memmap.zones[i].start), FRAME_SIZE);
if (!frame_adjust_zone_bounds(low, &base, &size))
continue;
pfn_t confdata;
pfn_t pfn = ADDR2PFN(base);
size_t count = SIZE2FRAMES(size);
if (low) {
/* Determine where to place confdata. */
if (pfn == 0) {
/*
* Avoid placing confdata at the NULL address.
*/
if (count == 1)
continue;
confdata = 1;
} else
confdata = pfn;
zone_create(pfn, count, confdata,
ZONE_AVAILABLE | ZONE_LOWMEM);
} else {
confdata = zone_external_conf_alloc(count);
if (confdata != 0)
zone_create(pfn, count, confdata,
ZONE_AVAILABLE | ZONE_HIGHMEM);
}
}
}
/** Create low memory zones. */
void frame_low_arch_init(void)
{
if (config.cpu_active > 1)
return;
frame_common_arch_init(true);
/*
* On ARM64, physical memory can start on a non-zero address. The
* generic frame_init() only marks PFN 0 as not free, so we must mark
* the physically first frame not free explicitly here, no matter what
* is its address.
*/
frame_mark_unavailable(ADDR2PFN(physmem_base), 1);
}
/** Create high memory zones. */
void frame_high_arch_init(void)
{
if (config.cpu_active > 1)
return;
frame_common_arch_init(false);
}
/** @}
*/