83 строки
2.3 KiB
C
83 строки
2.3 KiB
C
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#ifndef _ASM_SCORE_FIXMAP_H
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#define _ASM_SCORE_FIXMAP_H
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#include <asm/page.h>
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#define PHY_RAM_BASE 0x00000000
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#define PHY_IO_BASE 0x10000000
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#define VIRTUAL_RAM_BASE 0xa0000000
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#define VIRTUAL_IO_BASE 0xb0000000
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#define RAM_SPACE_SIZE 0x10000000
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#define IO_SPACE_SIZE 0x10000000
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/* Kernel unmapped, cached 512MB */
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#define KSEG1 0xa0000000
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/*
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* Here we define all the compile-time 'special' virtual
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* addresses. The point is to have a constant address at
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* compile time, but to set the physical address only
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* in the boot process. We allocate these special addresses
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* from the end of virtual memory (0xfffff000) backwards.
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* Also this lets us do fail-safe vmalloc(), we
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* can guarantee that these special addresses and
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* vmalloc()-ed addresses never overlap.
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*
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* these 'compile-time allocated' memory buffers are
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* fixed-size 4k pages. (or larger if used with an increment
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* highger than 1) use fixmap_set(idx,phys) to associate
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* physical memory with fixmap indices.
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*
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* TLB entries of such buffers will not be flushed across
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* task switches.
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*/
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/*
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* on UP currently we will have no trace of the fixmap mechanizm,
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* no page table allocations, etc. This might change in the
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* future, say framebuffers for the console driver(s) could be
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* fix-mapped?
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*/
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enum fixed_addresses {
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#define FIX_N_COLOURS 8
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FIX_CMAP_BEGIN,
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FIX_CMAP_END = FIX_CMAP_BEGIN + FIX_N_COLOURS,
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__end_of_fixed_addresses
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};
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/*
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* used by vmalloc.c.
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*
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* Leave one empty page between vmalloc'ed areas and
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* the start of the fixmap, and leave one page empty
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* at the top of mem..
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*/
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#define FIXADDR_TOP ((unsigned long)(long)(int)0xfefe0000)
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#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
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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) \
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((FIXADDR_TOP - ((x) & PAGE_MASK)) >> PAGE_SHIFT)
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extern void __this_fixmap_does_not_exist(void);
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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 inline unsigned long fix_to_virt(const unsigned int idx)
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{
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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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return __virt_to_fix(vaddr);
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}
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#endif /* _ASM_SCORE_FIXMAP_H */
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