blob: 5869e3fa5dd3ac4f9b31cd63140ac01592593ddd [file] [log] [blame]
* OpenRISC prom.c
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
* Modifications for the OpenRISC architecture:
* Copyright (C) 2010-2011 Jonas Bonn <>
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
* Architecture specific procedures for creating, accessing and
* interpreting the device tree.
#include <stdarg.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/threads.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/stringify.h>
#include <linux/delay.h>
#include <linux/initrd.h>
#include <linux/bitops.h>
#include <linux/module.h>
#include <linux/kexec.h>
#include <linux/debugfs.h>
#include <linux/irq.h>
#include <linux/memblock.h>
#include <linux/of_fdt.h>
#include <asm/prom.h>
#include <asm/page.h>
#include <asm/processor.h>
#include <asm/irq.h>
#include <linux/io.h>
#include <asm/mmu.h>
#include <asm/pgtable.h>
#include <asm/sections.h>
#include <asm/setup.h>
extern char cmd_line[COMMAND_LINE_SIZE];
void __init early_init_dt_add_memory_arch(u64 base, u64 size)
size &= PAGE_MASK;
memblock_add(base, size);
void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
return __va(memblock_alloc(size, align));
void __init early_init_devtree(void *params)
void *alloc;
/* Setup flat device-tree pointer */
initial_boot_params = params;
/* Retrieve various informations from the /chosen node of the
* device-tree, including the platform type, initrd location and
* size, TCE reserve, and more ...
of_scan_flat_dt(early_init_dt_scan_chosen, cmd_line);
/* Scan memory nodes and rebuild MEMBLOCKs */
of_scan_flat_dt(early_init_dt_scan_root, NULL);
of_scan_flat_dt(early_init_dt_scan_memory, NULL);
/* Save command line for /proc/cmdline and then parse parameters */
strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
/* We must copy the flattend device tree from init memory to regular
* memory because the device tree references the strings in it
* directly.
alloc = __va(memblock_alloc(initial_boot_params->totalsize, PAGE_SIZE));
memcpy(alloc, initial_boot_params, initial_boot_params->totalsize);
initial_boot_params = alloc;
void __init early_init_dt_setup_initrd_arch(unsigned long start,
unsigned long end)
initrd_start = (unsigned long)__va(start);
initrd_end = (unsigned long)__va(end);
initrd_below_start_ok = 1;