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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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>
38 lines
819 B
C
38 lines
819 B
C
/*
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* arch/arm/include/asm/prom.h
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*
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* Copyright (C) 2009 Canonical Ltd. <jeremy.kerr@canonical.com>
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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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*/
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#ifndef __ASMARM_PROM_H
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#define __ASMARM_PROM_H
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#ifdef CONFIG_OF
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#include <asm/setup.h>
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#include <asm/irq.h>
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static inline void irq_dispose_mapping(unsigned int virq)
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{
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return;
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}
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extern struct machine_desc *setup_machine_fdt(unsigned int dt_phys);
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extern void arm_dt_memblock_reserve(void);
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#else /* CONFIG_OF */
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static inline struct machine_desc *setup_machine_fdt(unsigned int dt_phys)
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{
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return NULL;
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}
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static inline void arm_dt_memblock_reserve(void) { }
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#endif /* CONFIG_OF */
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#endif /* ASMARM_PROM_H */
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