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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @brief BSP specific initialization support routines
*
*/
/*
* COPYRIGHT (c) 1989-2020.
* On-Line Applications Research Corporation (OAR).
* Cobham Gaisler AB.
*
* 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.
*
* 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 <bsp.h>
#include <bsp/fdt.h>
#include <rtems/sysinit.h>
#include <libfdt.h>
/*
* These are provided by the linkcmds for ALL of the BSPs which use this file.
*/
extern char WorkAreaBase[];
extern char RamEnd[];
static Memory_Area _Memory_Areas[ 1 ];
static const char memory_path[] = "/memory";
static void* get_end_of_memory_from_fdt(void)
{
const void *fdt;
const void *val;
int node;
int parent;
int ac;
int sc;
int len;
uintptr_t start;
uintptr_t size;
fdt = bsp_fdt_get();
node = fdt_path_offset_namelen(
fdt,
memory_path,
(int) sizeof(memory_path) - 1
);
if (node < 0) {
return NULL;
}
parent = fdt_parent_offset(fdt, node);
if (parent < 0) {
return NULL;
}
ac = fdt_address_cells(fdt, parent);
if (ac != 1 && ac != 2) {
return NULL;
}
sc = fdt_size_cells(fdt, parent);
if (sc != 1 && sc != 2) {
return NULL;
}
if (sc > ac) {
return NULL;
}
val = fdt_getprop(fdt, node, "reg", &len);
if (len < sc + ac) {
return NULL;
}
if (ac == 1) {
start = fdt32_to_cpu(((fdt32_t *)val)[0]);
size = fdt32_to_cpu(((fdt32_t *)val)[1]);
}
if (ac == 2) {
start = fdt64_to_cpu(((fdt64_t *)val)[0]);
if (sc == 1)
size = fdt32_to_cpu(((fdt32_t *)(val+8))[0]);
else
size = fdt64_to_cpu(((fdt64_t *)val)[1]);
}
return (void*) (start + size);
}
static void bsp_memory_initialize( void )
{
void *end;
/* get end of memory from the "/memory" node in the fdt */
end = get_end_of_memory_from_fdt();
if (end == NULL) {
/* fall back to linker symbol if "/memory" node not found or invalid */
end = RamEnd;
}
_Memory_Initialize( &_Memory_Areas[ 0 ], WorkAreaBase, end );
}
RTEMS_SYSINIT_ITEM(
bsp_memory_initialize,
RTEMS_SYSINIT_MEMORY,
RTEMS_SYSINIT_ORDER_MIDDLE
);
static const Memory_Information _Memory_Information =
MEMORY_INFORMATION_INITIALIZER( _Memory_Areas );
const Memory_Information *_Memory_Get( void )
{
return &_Memory_Information;
}
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