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/**
* @file
*
* @ingroup arm_start
*
* @brief Raspberry pi workarea initialization.
*/
/*
* COPYRIGHT (c) 1989-2008.
* On-Line Applications Research Corporation (OAR).
*
* Copyright (c) 2011-2012 embedded brains GmbH.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*
* Copyright (c) 2015 YANG Qiao
*
* Code is based on c/src/lib/libbsp/shared/bspgetworkarea.c
*/
#include <string.h>
#include <bsp.h>
#include <bsp/bootcard.h>
#include <bsp/vc.h>
#if defined(HAS_UBOOT) && !defined(BSP_DISABLE_UBOOT_WORK_AREA_CONFIG)
#define USE_UBOOT
#endif
/*
* These are provided by the linkcmds for ALL of the BSPs which use this file.
*/
extern char WorkAreaBase[];
/*
* We may get the size information from U-Boot or the linker scripts.
*/
#ifdef USE_UBOOT
#include <bsp/u-boot.h>
#else
extern char RamBase[];
extern char RamSize[];
#endif
void bsp_work_area_initialize(void)
{
uintptr_t work_base = (uintptr_t) WorkAreaBase;
uintptr_t ram_end;
bcm2835_get_vc_memory_entries vc_entry;
/*
* bcm2835_get_arm_memory_entries arm_entry;
* is another alternative how to obtain usable memory size
*/
#ifdef USE_UBOOT
ram_end = (uintptr_t) bsp_uboot_board_info.bi_memstart +
bsp_uboot_board_info.bi_memsize;
#else
ram_end = (uintptr_t)RamBase + (uintptr_t)RamSize;
#endif
memset( &vc_entry, 0, sizeof(vc_entry) );
if (bcm2835_mailbox_get_vc_memory( &vc_entry ) >= 0) {
if (vc_entry.base > 10 * 1024 *1024)
ram_end = ram_end > vc_entry.base? vc_entry.base: ram_end;
}
bsp_work_area_initialize_default( (void *) work_base, ram_end - work_base );
}
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