/* * OpenRISC Linux * * Linux architectural port borrowing liberally from similar works of * others. All original copyrights apply as per the original source * declaration. * * OpenRISC implementation: * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> * et al. * * 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. */ #ifndef __ASM_OPENRISC_FIXMAP_H #define __ASM_OPENRISC_FIXMAP_H /* Why exactly do we need 2 empty pages between the top of the fixed * addresses and the top of virtual memory? Something is using that * memory space but not sure what right now... If you find it, leave * a comment here. */ #define FIXADDR_TOP ((unsigned long) (-2*PAGE_SIZE)) #include <linux/kernel.h> #include <linux/bug.h> #include <asm/page.h> /* * On OpenRISC we use these special fixed_addresses for doing ioremap * early in the boot process before memory initialization is complete. * This is used, in particular, by the early serial console code. * * It's not really 'fixmap', per se, but fits loosely into the same * paradigm. */ enum fixed_addresses { /* * FIX_IOREMAP entries are useful for mapping physical address * space before ioremap() is useable, e.g. really early in boot * before kmalloc() is working. */ #define FIX_N_IOREMAPS 32 FIX_IOREMAP_BEGIN, FIX_IOREMAP_END = FIX_IOREMAP_BEGIN + FIX_N_IOREMAPS - 1, __end_of_fixed_addresses }; #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) /* FIXADDR_BOTTOM might be a better name here... */ #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) /* * 'index to address' translation. If anyone tries to use the idx * directly without tranlation, we catch the bug with a NULL-deference * kernel oops. Illegal ranges of incoming indices are caught too. */ static __always_inline unsigned long fix_to_virt(const unsigned int idx) { /* * this branch gets completely eliminated after inlining, * except when someone tries to use fixaddr indices in an * illegal way. (such as mixing up address types or using * out-of-range indices). * * If it doesn't get removed, the linker will complain * loudly with a reasonably clear error message.. */ if (idx >= __end_of_fixed_addresses) BUG(); return __fix_to_virt(idx); } static inline unsigned long virt_to_fix(const unsigned long vaddr) { BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); return __virt_to_fix(vaddr); } #endif
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bitops | Folder | 0755 |
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Kbuild | File | 997 B | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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atomic.h | File | 3.02 KB | 0644 |
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barrier.h | File | 203 B | 0644 |
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bitops.h | File | 1.5 KB | 0644 |
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cache.h | File | 888 B | 0644 |
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cacheflush.h | File | 3.37 KB | 0644 |
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cmpxchg.h | File | 3.92 KB | 0644 |
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cpuinfo.h | File | 970 B | 0644 |
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delay.h | File | 670 B | 0644 |
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dma-mapping.h | File | 968 B | 0644 |
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elf.h | File | 2.02 KB | 0644 |
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fixmap.h | File | 2.74 KB | 0644 |
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futex.h | File | 2.24 KB | 0644 |
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io.h | File | 1.31 KB | 0644 |
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irq.h | File | 835 B | 0644 |
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irqflags.h | File | 866 B | 0644 |
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linkage.h | File | 764 B | 0644 |
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mmu.h | File | 728 B | 0644 |
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mmu_context.h | File | 1.3 KB | 0644 |
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page.h | File | 2.54 KB | 0644 |
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pgalloc.h | File | 2.57 KB | 0644 |
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pgtable.h | File | 13.96 KB | 0644 |
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processor.h | File | 2.7 KB | 0644 |
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ptrace.h | File | 3.33 KB | 0644 |
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serial.h | File | 1.11 KB | 0644 |
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smp.h | File | 822 B | 0644 |
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spinlock.h | File | 985 B | 0644 |
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spinlock_types.h | File | 188 B | 0644 |
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spr.h | File | 1.17 KB | 0644 |
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spr_defs.h | File | 22.91 KB | 0644 |
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string.h | File | 324 B | 0644 |
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syscall.h | File | 1.91 KB | 0644 |
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syscalls.h | File | 1.04 KB | 0644 |
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thread_info.h | File | 3.85 KB | 0644 |
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time.h | File | 627 B | 0644 |
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timex.h | File | 914 B | 0644 |
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tlb.h | File | 1.01 KB | 0644 |
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tlbflush.h | File | 2.05 KB | 0644 |
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uaccess.h | File | 7.98 KB | 0644 |
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unaligned.h | File | 1.7 KB | 0644 |
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unwinder.h | File | 557 B | 0644 |
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