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9ccba66d4d
At the time being, the fixmap area is defined at the top of
the address space or just below KASAN.
This definition is not valid for PPC64.
For PPC64, use the top of the I/O space.
Because of circular dependencies, it is not possible to include
asm/fixmap.h in asm/book3s/64/pgtable.h , so define a fixed size
AREA at the top of the I/O space for fixmap and ensure during
build that the size is big enough.
Fixes: 265c3491c4 ("powerpc: Add support for GENERIC_EARLY_IOREMAP")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/0d51620eacf036d683d1a3c41328f69adb601dc0.1618925560.git.christophe.leroy@csgroup.eu
122 lines
3.6 KiB
C
122 lines
3.6 KiB
C
/*
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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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