LXR uboot/arch/arm/lib/stack.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (c) 2015 Andreas Bießmann <andreas@biessmann.org>
   4 *
   5 * Copyright (c) 2011 The Chromium OS Authors.
   6 * (C) Copyright 2002-2006
   7 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   8 *
   9 * (C) Copyright 2002
  10 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  11 * Marius Groeger <mgroeger@sysgo.de>
  12 */
  13#include <common.h>
  14#include <init.h>
  15#include <lmb.h>
  16#include <asm/global_data.h>
  17
  18DECLARE_GLOBAL_DATA_PTR;
  19
  20int arch_reserve_stacks(void)
  21{
  22#ifdef CONFIG_SPL_BUILD
  23        gd->start_addr_sp -= 128;       /* leave 32 words for abort-stack */
  24        gd->irq_sp = gd->start_addr_sp;
  25#else
  26        /* setup stack pointer for exceptions */
  27        gd->irq_sp = gd->start_addr_sp;
  28
  29# if !defined(CONFIG_ARM64)
  30        /* leave 3 words for abort-stack, plus 1 for alignment */
  31        gd->start_addr_sp -= 16;
  32# endif
  33#endif
  34
  35        return 0;
  36}
  37
  38static ulong get_sp(void)
  39{
  40        ulong ret;
  41
  42        asm("mov %0, sp" : "=r"(ret) : );
  43        return ret;
  44}
  45
  46void arch_lmb_reserve(struct lmb *lmb)
  47{
  48        arch_lmb_reserve_generic(lmb, get_sp(), gd->ram_top, 16384);
  49}
  50