1 #include <linux/bug.h> 2 #include <linux/export.h> 3 #include <linux/types.h> 4 #include <linux/mmdebug.h> 5 #include <linux/mm.h> 6 7 #include <asm/sections.h> 8 #include <asm/memory.h> 9 #include <asm/fixmap.h> 10 #include <asm/dma.h> 11 12 #include "mm.h" 13 14 static inline bool __virt_addr_valid(unsigned long x) 15 { 16 /* 17 * high_memory does not get immediately defined, and there 18 * are early callers of __pa() against PAGE_OFFSET 19 */ 20 if (!high_memory && x >= PAGE_OFFSET) 21 return true; 22 23 if (high_memory && x >= PAGE_OFFSET && x < (unsigned long)high_memory) 24 return true; 25 26 /* 27 * MAX_DMA_ADDRESS is a virtual address that may not correspond to an 28 * actual physical address. Enough code relies on __pa(MAX_DMA_ADDRESS) 29 * that we just need to work around it and always return true. 30 */ 31 if (x == MAX_DMA_ADDRESS) 32 return true; 33 34 return false; 35 } 36 37 phys_addr_t __virt_to_phys(unsigned long x) 38 { 39 WARN(!__virt_addr_valid(x), 40 "virt_to_phys used for non-linear address: %pK (%pS)\n", 41 (void *)x, (void *)x); 42 43 return __virt_to_phys_nodebug(x); 44 } 45 EXPORT_SYMBOL(__virt_to_phys); 46 47 phys_addr_t __phys_addr_symbol(unsigned long x) 48 { 49 /* This is bounds checking against the kernel image only. 50 * __pa_symbol should only be used on kernel symbol addresses. 51 */ 52 VIRTUAL_BUG_ON(x < (unsigned long)KERNEL_START || 53 x > (unsigned long)KERNEL_END); 54 55 return __pa_symbol_nodebug(x); 56 } 57 EXPORT_SYMBOL(__phys_addr_symbol); 58