93c02ab40a
If a dtb is passed to the kernel then the kernel needs to iterate
through compiled-in mdescs looking for one that matches and move the
dtb data to a safe location before it gets accidentally overwritten by
the kernel.
This patch creates a new function, setup_machine_fdt() which is
analogous to the setup_machine_atags() created in the previous patch.
It does all the early setup needed to use a device tree machine
description.
v5: - Print warning with neither dtb nor atags are passed to the kernel
- Fix bug in setting of __machine_arch_type to the selected machine,
not just the last machine in the list.
Reported-by: Tixy <tixy@yxit.co.uk>
- Copy command line directly into boot_command_line instead of cmd_line
v4: - Dump some output when a matching machine_desc cannot be found
v3: - Added processing of reserved list.
- Backed out the v2 change that copied instead of reserved the
dtb. dtb is reserved again and the real problem was fixed by
using alloc_bootmem_align() for early allocation of RAM for
unflattening the tree.
- Moved cmd_line and initrd changes to earlier patch to make series
bisectable.
v2: Changed to save the dtb by copying into an allocated buffer.
- Since the dtb will very likely be passed in the first 16k of ram
where the interrupt vectors live, memblock_reserve() is
insufficient to protect the dtb data.
[based on work originally written by Jeremy Kerr <jeremy.kerr@canonical.com>]
Tested-by: Tony Lindgren <tony@atomide.com>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
73 lines
2 KiB
C
73 lines
2 KiB
C
/*
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* arch/arm/include/asm/mach/arch.h
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*
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* Copyright (C) 2000 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASSEMBLY__
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struct tag;
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struct meminfo;
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struct sys_timer;
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struct machine_desc {
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unsigned int nr; /* architecture number */
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const char *name; /* architecture name */
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unsigned long boot_params; /* tagged list */
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const char **dt_compat; /* array of device tree
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* 'compatible' strings */
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unsigned int nr_irqs; /* number of IRQs */
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unsigned int video_start; /* start of video RAM */
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unsigned int video_end; /* end of video RAM */
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unsigned int reserve_lp0 :1; /* never has lp0 */
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unsigned int reserve_lp1 :1; /* never has lp1 */
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unsigned int reserve_lp2 :1; /* never has lp2 */
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unsigned int soft_reboot :1; /* soft reboot */
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void (*fixup)(struct machine_desc *,
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struct tag *, char **,
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struct meminfo *);
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void (*reserve)(void);/* reserve mem blocks */
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void (*map_io)(void);/* IO mapping function */
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void (*init_early)(void);
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void (*init_irq)(void);
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struct sys_timer *timer; /* system tick timer */
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void (*init_machine)(void);
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#ifdef CONFIG_MULTI_IRQ_HANDLER
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void (*handle_irq)(struct pt_regs *);
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#endif
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};
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/*
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* Current machine - only accessible during boot.
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*/
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extern struct machine_desc *machine_desc;
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/*
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* Machine type table - also only accessible during boot
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*/
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extern struct machine_desc __arch_info_begin[], __arch_info_end[];
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#define for_each_machine_desc(p) \
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for (p = __arch_info_begin; p < __arch_info_end; p++)
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/*
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* Set of macros to define architecture features. This is built into
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* a table by the linker.
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*/
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#define MACHINE_START(_type,_name) \
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static const struct machine_desc __mach_desc_##_type \
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__used \
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__attribute__((__section__(".arch.info.init"))) = { \
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.nr = MACH_TYPE_##_type, \
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.name = _name,
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#define MACHINE_END \
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};
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#endif
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