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121 lines
3.6 KiB
121 lines
3.6 KiB
/* |
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* fixmap.h: compile-time virtual memory allocation |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 1998 Ingo Molnar |
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* |
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* Copyright 2008 Freescale Semiconductor Inc. |
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* Port to powerpc added by Kumar Gala |
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*/ |
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#ifndef _ASM_FIXMAP_H |
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#define _ASM_FIXMAP_H |
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#ifndef __ASSEMBLY__ |
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#include <linux/sizes.h> |
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#include <linux/pgtable.h> |
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#include <asm/page.h> |
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#ifdef CONFIG_HIGHMEM |
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#include <linux/threads.h> |
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#include <asm/kmap_size.h> |
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#endif |
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#ifdef CONFIG_PPC64 |
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#define FIXADDR_TOP (IOREMAP_END + FIXADDR_SIZE) |
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#else |
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#define FIXADDR_SIZE 0 |
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#ifdef CONFIG_KASAN |
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#include <asm/kasan.h> |
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#define FIXADDR_TOP (KASAN_SHADOW_START - PAGE_SIZE) |
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#else |
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#define FIXADDR_TOP ((unsigned long)(-PAGE_SIZE)) |
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#endif |
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#endif |
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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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enum fixed_addresses { |
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FIX_HOLE, |
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#ifdef CONFIG_PPC32 |
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/* reserve the top 128K for early debugging purposes */ |
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FIX_EARLY_DEBUG_TOP = FIX_HOLE, |
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FIX_EARLY_DEBUG_BASE = FIX_EARLY_DEBUG_TOP+(ALIGN(SZ_128K, PAGE_SIZE)/PAGE_SIZE)-1, |
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#ifdef CONFIG_HIGHMEM |
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FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ |
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FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1, |
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#endif |
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#ifdef CONFIG_PPC_8xx |
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/* For IMMR we need an aligned 512K area */ |
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#define FIX_IMMR_SIZE (512 * 1024 / PAGE_SIZE) |
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FIX_IMMR_START, |
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FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 + |
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FIX_IMMR_SIZE, |
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#endif |
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#ifdef CONFIG_PPC_83xx |
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/* For IMMR we need an aligned 2M area */ |
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#define FIX_IMMR_SIZE (SZ_2M / PAGE_SIZE) |
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FIX_IMMR_START, |
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FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 + |
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FIX_IMMR_SIZE, |
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#endif |
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/* FIX_PCIE_MCFG, */ |
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#endif /* CONFIG_PPC32 */ |
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__end_of_permanent_fixed_addresses, |
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#define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE) |
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#define FIX_BTMAPS_SLOTS 16 |
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#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) |
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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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__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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#define FIXADDR_START (FIXADDR_TOP - __FIXADDR_SIZE) |
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#define FIXMAP_ALIGNED_SIZE (ALIGN(FIXADDR_TOP, PGDIR_SIZE) - \ |
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ALIGN_DOWN(FIXADDR_START, PGDIR_SIZE)) |
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#define FIXMAP_PTE_SIZE (FIXMAP_ALIGNED_SIZE / PGDIR_SIZE * PTE_TABLE_SIZE) |
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#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NCG |
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#define FIXMAP_PAGE_IO PAGE_KERNEL_NCG |
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#include <asm-generic/fixmap.h> |
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static inline void __set_fixmap(enum fixed_addresses idx, |
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phys_addr_t phys, pgprot_t flags) |
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{ |
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BUILD_BUG_ON(IS_ENABLED(CONFIG_PPC64) && __FIXADDR_SIZE > FIXADDR_SIZE); |
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if (__builtin_constant_p(idx)) |
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BUILD_BUG_ON(idx >= __end_of_fixed_addresses); |
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else if (WARN_ON(idx >= __end_of_fixed_addresses)) |
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return; |
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map_kernel_page(__fix_to_virt(idx), phys, flags); |
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} |
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#define __early_set_fixmap __set_fixmap |
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#endif /* !__ASSEMBLY__ */ |
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#endif
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