52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
#ifndef _ASM_FIXMAP_H
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#define _ASM_FIXMAP_H
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#include <linux/kernel.h>
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#include <asm/pgtable.h>
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#include <asm/kmap_types.h>
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#define FIXADDR_START 0xffc00000UL
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#define FIXADDR_END 0xfff00000UL
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#define FIXADDR_TOP (FIXADDR_END - PAGE_SIZE)
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/*
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* 224 temporary boot-time mappings, used by early_ioremap(),
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* before ioremap() is functional.
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*
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* (P)re-using the FIXADDR region, which is used for highmem
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* later on, and statically aligned to 1MB.
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*/
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#define NR_FIX_BTMAPS 32
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#define FIX_BTMAPS_SLOTS 7
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#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
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enum fixed_addresses {
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FIX_EARLYCON_MEM_BASE,
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__end_of_permanent_fixed_addresses,
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FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
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FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
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FIX_KMAP_BEGIN = __end_of_permanent_fixed_addresses,
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FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1,
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/* Support writing RO kernel text via kprobes, jump labels, etc. */
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FIX_TEXT_POKE0,
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FIX_TEXT_POKE1,
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__end_of_fixed_addresses = (FIXADDR_END - FIXADDR_START) >> PAGE_SHIFT,
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};
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#define FIXMAP_PAGE_COMMON (L_PTE_YOUNG | L_PTE_PRESENT | L_PTE_XN)
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#define FIXMAP_PAGE_NORMAL (FIXMAP_PAGE_COMMON | L_PTE_MT_WRITEBACK)
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#define FIXMAP_PAGE_IO (FIXMAP_PAGE_COMMON | L_PTE_MT_DEV_SHARED | L_PTE_SHARED | L_PTE_DIRTY)
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#define FIXMAP_PAGE_NOCACHE FIXMAP_PAGE_IO
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extern void __early_set_fixmap(enum fixed_addresses idx,
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phys_addr_t phys, pgprot_t flags);
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void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
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#include <asm-generic/fixmap.h>
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#endif
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