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58 lines
1.4 KiB
58 lines
1.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/bug.h> |
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#include <linux/export.h> |
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#include <linux/types.h> |
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#include <linux/mmdebug.h> |
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#include <linux/mm.h> |
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#include <asm/sections.h> |
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#include <asm/memory.h> |
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#include <asm/fixmap.h> |
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#include <asm/dma.h> |
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#include "mm.h" |
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static inline bool __virt_addr_valid(unsigned long x) |
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{ |
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/* |
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* high_memory does not get immediately defined, and there |
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* are early callers of __pa() against PAGE_OFFSET |
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*/ |
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if (!high_memory && x >= PAGE_OFFSET) |
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return true; |
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if (high_memory && x >= PAGE_OFFSET && x < (unsigned long)high_memory) |
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return true; |
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/* |
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* MAX_DMA_ADDRESS is a virtual address that may not correspond to an |
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* actual physical address. Enough code relies on __pa(MAX_DMA_ADDRESS) |
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* that we just need to work around it and always return true. |
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*/ |
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if (x == MAX_DMA_ADDRESS) |
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return true; |
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return false; |
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} |
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phys_addr_t __virt_to_phys(unsigned long x) |
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{ |
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WARN(!__virt_addr_valid(x), |
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"virt_to_phys used for non-linear address: %pK (%pS)\n", |
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(void *)x, (void *)x); |
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return __virt_to_phys_nodebug(x); |
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} |
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EXPORT_SYMBOL(__virt_to_phys); |
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phys_addr_t __phys_addr_symbol(unsigned long x) |
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{ |
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/* This is bounds checking against the kernel image only. |
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* __pa_symbol should only be used on kernel symbol addresses. |
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*/ |
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VIRTUAL_BUG_ON(x < (unsigned long)KERNEL_START || |
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x > (unsigned long)KERNEL_END); |
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return __pa_symbol_nodebug(x); |
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} |
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EXPORT_SYMBOL(__phys_addr_symbol);
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