a8efebe719
Sandbox uses an API to map between addresses and pointers. This allows it to have (emulated) memory at zero and avoid arch-specific addressing details. It also allows memory-mapped peripherals to work. As an example, on many machines sandbox maps address 100 to pointer value 10000000. However this is not correct for ACPI, if sandbox starts another program (e.g EFI app) and passes it the tables. That app has no knowledge of sandbox's address mapping. So to make this work we want to store 10000000 as the value in the table. Add two new 'nomap' functions which clearly make this exeption to how sandbox works. This should allow EFI apps to access ACPI tables with sandbox, e.g. for testing purposes. Signed-off-by: Simon Glass <sjg@chromium.org> Suggested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2015 National Instruments
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*
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* (C) Copyright 2015
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* Joe Hershberger <joe.hershberger@ni.com>
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*/
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#ifndef __MAPMEM_H
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#define __MAPMEM_H
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/* Define a null map_sysmem() if the architecture doesn't use it */
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# ifdef CONFIG_ARCH_MAP_SYSMEM
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#include <asm/io.h>
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# else
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#include <linux/types.h>
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static inline void *map_sysmem(phys_addr_t paddr, unsigned long len)
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{
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return (void *)(uintptr_t)paddr;
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}
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static inline void unmap_sysmem(const void *vaddr)
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{
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}
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static inline phys_addr_t map_to_sysmem(const void *ptr)
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{
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return (phys_addr_t)(uintptr_t)ptr;
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}
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/**
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* nomap_sysmem() - pass through an address unchanged
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*
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* This is used to indicate an address which should NOT be mapped, e.g. in
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* SMBIOS tables. Using this function instead of a case shows that the sandbox
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* conversion has been done
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*/
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static inline void *nomap_sysmem(phys_addr_t paddr, unsigned long len)
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{
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return (void *)(uintptr_t)paddr;
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}
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static inline phys_addr_t nomap_to_sysmem(const void *ptr)
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{
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return (phys_addr_t)(uintptr_t)ptr;
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}
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# endif
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#endif /* __MAPMEM_H */
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