1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/memblock.h>
3 #include <linux/mmdebug.h>
4 #include <linux/export.h>
8 #include <linux/vmalloc.h>
14 #ifdef CONFIG_DEBUG_VIRTUAL
15 unsigned long __phys_addr(unsigned long x)
17 unsigned long y = x - __START_KERNEL_map;
19 /* use the carry flag to determine if x was < __START_KERNEL_map */
20 if (unlikely(x > y)) {
23 VIRTUAL_BUG_ON(y >= KERNEL_IMAGE_SIZE);
25 x = y + (__START_KERNEL_map - PAGE_OFFSET);
27 /* carry flag will be set if starting x was >= PAGE_OFFSET */
28 VIRTUAL_BUG_ON((x > y) || !phys_addr_valid(x));
33 EXPORT_SYMBOL(__phys_addr);
35 unsigned long __phys_addr_symbol(unsigned long x)
37 unsigned long y = x - __START_KERNEL_map;
39 /* only check upper bounds since lower bounds will trigger carry */
40 VIRTUAL_BUG_ON(y >= KERNEL_IMAGE_SIZE);
44 EXPORT_SYMBOL(__phys_addr_symbol);
47 bool __virt_addr_valid(unsigned long x)
49 unsigned long y = x - __START_KERNEL_map;
51 /* use the carry flag to determine if x was < __START_KERNEL_map */
52 if (unlikely(x > y)) {
55 if (y >= KERNEL_IMAGE_SIZE)
58 x = y + (__START_KERNEL_map - PAGE_OFFSET);
60 /* carry flag will be set if starting x was >= PAGE_OFFSET */
61 if ((x > y) || !phys_addr_valid(x))
65 return pfn_valid(x >> PAGE_SHIFT);
67 EXPORT_SYMBOL(__virt_addr_valid);
71 #ifdef CONFIG_DEBUG_VIRTUAL
72 unsigned long __phys_addr(unsigned long x)
74 unsigned long phys_addr = x - PAGE_OFFSET;
75 /* VMALLOC_* aren't constants */
76 VIRTUAL_BUG_ON(x < PAGE_OFFSET);
77 VIRTUAL_BUG_ON(__vmalloc_start_set && is_vmalloc_addr((void *) x));
78 /* max_low_pfn is set early, but not _that_ early */
80 VIRTUAL_BUG_ON((phys_addr >> PAGE_SHIFT) > max_low_pfn);
81 BUG_ON(slow_virt_to_phys((void *)x) != phys_addr);
85 EXPORT_SYMBOL(__phys_addr);
88 bool __virt_addr_valid(unsigned long x)
92 if (__vmalloc_start_set && is_vmalloc_addr((void *) x))
94 if (x >= FIXADDR_START)
96 return pfn_valid((x - PAGE_OFFSET) >> PAGE_SHIFT);
98 EXPORT_SYMBOL(__virt_addr_valid);
100 #endif /* CONFIG_X86_64 */