KVM: x86: fix emulation of "movzbl %bpl, %eax"
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / x86 / mm / physaddr.c
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a25b9316 1#include <linux/bootmem.h>
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2#include <linux/mmdebug.h>
3#include <linux/module.h>
4#include <linux/mm.h>
5
6#include <asm/page.h>
7
8#include "physaddr.h"
9
10#ifdef CONFIG_X86_64
11
0bdf525f 12#ifdef CONFIG_DEBUG_VIRTUAL
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13unsigned long __phys_addr(unsigned long x)
14{
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15 unsigned long y = x - __START_KERNEL_map;
16
17 /* use the carry flag to determine if x was < __START_KERNEL_map */
18 if (unlikely(x > y)) {
19 x = y + phys_base;
20
21 VIRTUAL_BUG_ON(y >= KERNEL_IMAGE_SIZE);
78c86e5e 22 } else {
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23 x = y + (__START_KERNEL_map - PAGE_OFFSET);
24
25 /* carry flag will be set if starting x was >= PAGE_OFFSET */
26 VIRTUAL_BUG_ON((x > y) || !phys_addr_valid(x));
78c86e5e 27 }
0bdf525f 28
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29 return x;
30}
31EXPORT_SYMBOL(__phys_addr);
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32
33unsigned long __phys_addr_symbol(unsigned long x)
34{
35 unsigned long y = x - __START_KERNEL_map;
36
37 /* only check upper bounds since lower bounds will trigger carry */
38 VIRTUAL_BUG_ON(y >= KERNEL_IMAGE_SIZE);
39
40 return y + phys_base;
41}
42EXPORT_SYMBOL(__phys_addr_symbol);
0bdf525f 43#endif
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44
45bool __virt_addr_valid(unsigned long x)
46{
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47 unsigned long y = x - __START_KERNEL_map;
48
49 /* use the carry flag to determine if x was < __START_KERNEL_map */
50 if (unlikely(x > y)) {
51 x = y + phys_base;
52
53 if (y >= KERNEL_IMAGE_SIZE)
78c86e5e 54 return false;
78c86e5e 55 } else {
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56 x = y + (__START_KERNEL_map - PAGE_OFFSET);
57
58 /* carry flag will be set if starting x was >= PAGE_OFFSET */
59 if ((x > y) || !phys_addr_valid(x))
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60 return false;
61 }
62
63 return pfn_valid(x >> PAGE_SHIFT);
64}
65EXPORT_SYMBOL(__virt_addr_valid);
66
67#else
68
69#ifdef CONFIG_DEBUG_VIRTUAL
70unsigned long __phys_addr(unsigned long x)
71{
a25b9316 72 unsigned long phys_addr = x - PAGE_OFFSET;
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73 /* VMALLOC_* aren't constants */
74 VIRTUAL_BUG_ON(x < PAGE_OFFSET);
75 VIRTUAL_BUG_ON(__vmalloc_start_set && is_vmalloc_addr((void *) x));
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76 /* max_low_pfn is set early, but not _that_ early */
77 if (max_low_pfn) {
78 VIRTUAL_BUG_ON((phys_addr >> PAGE_SHIFT) > max_low_pfn);
79 BUG_ON(slow_virt_to_phys((void *)x) != phys_addr);
80 }
81 return phys_addr;
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82}
83EXPORT_SYMBOL(__phys_addr);
84#endif
85
86bool __virt_addr_valid(unsigned long x)
87{
88 if (x < PAGE_OFFSET)
89 return false;
90 if (__vmalloc_start_set && is_vmalloc_addr((void *) x))
91 return false;
92 if (x >= FIXADDR_START)
93 return false;
94 return pfn_valid((x - PAGE_OFFSET) >> PAGE_SHIFT);
95}
96EXPORT_SYMBOL(__virt_addr_valid);
97
98#endif /* CONFIG_X86_64 */