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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* OpenRISC Linux
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*
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* Linux architectural port borrowing liberally from similar works of
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* others. All original copyrights apply as per the original source
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* declaration.
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*
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* OpenRISC implementation:
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* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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* et al.
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*/
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#ifndef __ASM_OPENRISC_FIXMAP_H
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#define __ASM_OPENRISC_FIXMAP_H
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/* Why exactly do we need 2 empty pages between the top of the fixed
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* addresses and the top of virtual memory? Something is using that
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* memory space but not sure what right now... If you find it, leave
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* a comment here.
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*/
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#define FIXADDR_TOP ((unsigned long) (-2*PAGE_SIZE))
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#include <linux/kernel.h>
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#include <linux/bug.h>
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#include <asm/page.h>
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/*
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* On OpenRISC we use these special fixed_addresses for doing ioremap
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* early in the boot process before memory initialization is complete.
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* This is used, in particular, by the early serial console code.
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*
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* It's not really 'fixmap', per se, but fits loosely into the same
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* paradigm.
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*/
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enum fixed_addresses {
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/*
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* FIX_IOREMAP entries are useful for mapping physical address
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* space before ioremap() is useable, e.g. really early in boot
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* before kmalloc() is working.
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*/
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#define FIX_N_IOREMAPS 32
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FIX_IOREMAP_BEGIN,
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FIX_IOREMAP_END = FIX_IOREMAP_BEGIN + FIX_N_IOREMAPS - 1,
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__end_of_fixed_addresses
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};
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#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
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/* FIXADDR_BOTTOM might be a better name here... */
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#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
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#define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
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#define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
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/*
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* 'index to address' translation. If anyone tries to use the idx
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* directly without tranlation, we catch the bug with a NULL-deference
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* kernel oops. Illegal ranges of incoming indices are caught too.
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*/
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static __always_inline unsigned long fix_to_virt(const unsigned int idx)
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{
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/*
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* this branch gets completely eliminated after inlining,
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* except when someone tries to use fixaddr indices in an
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* illegal way. (such as mixing up address types or using
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* out-of-range indices).
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*
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* If it doesn't get removed, the linker will complain
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* loudly with a reasonably clear error message..
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*/
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if (idx >= __end_of_fixed_addresses)
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BUG();
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return __fix_to_virt(idx);
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}
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static inline unsigned long virt_to_fix(const unsigned long vaddr)
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{
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BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
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return __virt_to_fix(vaddr);
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}
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#endif
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