1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2015 Andreas Bießmann <andreas@biessmann.org>
5 * Copyright (c) 2011 The Chromium OS Authors.
6 * (C) Copyright 2002-2006
7 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
10 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
11 * Marius Groeger <mgroeger@sysgo.de>
16 #include <asm/global_data.h>
18 DECLARE_GLOBAL_DATA_PTR;
20 int arch_reserve_stacks(void)
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;
26 /* setup stack pointer for exceptions */
27 gd->irq_sp = gd->start_addr_sp;
29 # if !defined(CONFIG_ARM64)
30 /* leave 3 words for abort-stack, plus 1 for alignment */
31 gd->start_addr_sp -= 16;
38 static ulong get_sp(void)
42 asm("mov %0, sp" : "=r"(ret) : );
46 void arch_lmb_reserve(struct lmb *lmb)
52 * Booting a (Linux) kernel image
54 * Allocate space for command line and board info - the
55 * address should be as high as possible within the reach of
56 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
57 * memory, which means far enough below the current stack
61 debug("## Current stack ends at 0x%08lx ", sp);
63 /* adjust sp by 4K to be safe */
65 for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
66 if (!gd->bd->bi_dram[bank].size ||
67 sp < gd->bd->bi_dram[bank].start)
69 /* Watch out for RAM at end of address space! */
70 bank_end = gd->bd->bi_dram[bank].start +
71 gd->bd->bi_dram[bank].size - 1;
74 if (bank_end > gd->ram_top)
75 bank_end = gd->ram_top - 1;
77 lmb_reserve(lmb, sp, bank_end - sp + 1);