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- #ifndef __UM_FIXMAP_H
- #define __UM_FIXMAP_H
- #include <asm/processor.h>
- #include <asm/kmap_types.h>
- #include <asm/archparam.h>
- #include <asm/page.h>
- #include <linux/threads.h>
- /*
- * Here we define all the compile-time 'special' virtual
- * addresses. The point is to have a constant address at
- * compile time, but to set the physical address only
- * in the boot process. We allocate these special addresses
- * from the end of virtual memory (0xfffff000) backwards.
- * Also this lets us do fail-safe vmalloc(), we
- * can guarantee that these special addresses and
- * vmalloc()-ed addresses never overlap.
- *
- * these 'compile-time allocated' memory buffers are
- * fixed-size 4k pages. (or larger if used with an increment
- * highger than 1) use fixmap_set(idx,phys) to associate
- * physical memory with fixmap indices.
- *
- * TLB entries of such buffers will not be flushed across
- * task switches.
- */
- /*
- * on UP currently we will have no trace of the fixmap mechanizm,
- * no page table allocations, etc. This might change in the
- * future, say framebuffers for the console driver(s) could be
- * fix-mapped?
- */
- enum fixed_addresses {
- __end_of_fixed_addresses
- };
- extern void __set_fixmap (enum fixed_addresses idx,
- unsigned long phys, pgprot_t flags);
- /*
- * used by vmalloc.c.
- *
- * Leave one empty page between vmalloc'ed areas and
- * the start of the fixmap, and leave one page empty
- * at the top of mem..
- */
- #define FIXADDR_TOP (TASK_SIZE - 2 * PAGE_SIZE)
- #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
- #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
- #include <asm-generic/fixmap.h>
- #endif
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