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