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1 | /* |
2 | * pci_syscall.c |
3 | * |
4 | * For architectures where we want to allow direct access |
5 | * to the PCI config stuff - it would probably be preferable |
6 | * on PCs too, but there people just do it by hand with the |
7 | * magic northbridge registers.. |
8 | */ |
9 | |
10 | #include <linux/errno.h> |
11 | #include <linux/pci.h> |
12 | #include <linux/syscalls.h> |
13 | #include <asm/uaccess.h> |
14 | #include "pci.h" |
15 | |
16 | SYSCALL_DEFINE5(pciconfig_read, unsigned long, bus, unsigned long, dfn, |
17 | unsigned long, off, unsigned long, len, void __user *, buf) |
18 | { |
19 | struct pci_dev *dev; |
20 | u8 byte; |
21 | u16 word; |
22 | u32 dword; |
23 | long err; |
24 | long cfg_ret; |
25 | |
26 | if (!capable(CAP_SYS_ADMIN)) |
27 | return -EPERM; |
28 | |
29 | err = -ENODEV; |
30 | dev = pci_get_bus_and_slot(bus, dfn); |
31 | if (!dev) |
32 | goto error; |
33 | |
34 | switch (len) { |
35 | case 1: |
36 | cfg_ret = pci_user_read_config_byte(dev, off, &byte); |
37 | break; |
38 | case 2: |
39 | cfg_ret = pci_user_read_config_word(dev, off, &word); |
40 | break; |
41 | case 4: |
42 | cfg_ret = pci_user_read_config_dword(dev, off, &dword); |
43 | break; |
44 | default: |
45 | err = -EINVAL; |
46 | goto error; |
47 | }; |
48 | |
49 | err = -EIO; |
50 | if (cfg_ret != PCIBIOS_SUCCESSFUL) |
51 | goto error; |
52 | |
53 | switch (len) { |
54 | case 1: |
55 | err = put_user(byte, (unsigned char __user *)buf); |
56 | break; |
57 | case 2: |
58 | err = put_user(word, (unsigned short __user *)buf); |
59 | break; |
60 | case 4: |
61 | err = put_user(dword, (unsigned int __user *)buf); |
62 | break; |
63 | } |
64 | pci_dev_put(dev); |
65 | return err; |
66 | |
67 | error: |
68 | /* ??? XFree86 doesn't even check the return value. They |
69 | just look for 0xffffffff in the output, since that's what |
70 | they get instead of a machine check on x86. */ |
71 | switch (len) { |
72 | case 1: |
73 | put_user(-1, (unsigned char __user *)buf); |
74 | break; |
75 | case 2: |
76 | put_user(-1, (unsigned short __user *)buf); |
77 | break; |
78 | case 4: |
79 | put_user(-1, (unsigned int __user *)buf); |
80 | break; |
81 | } |
82 | pci_dev_put(dev); |
83 | return err; |
84 | } |
85 | |
86 | SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn, |
87 | unsigned long, off, unsigned long, len, void __user *, buf) |
88 | { |
89 | struct pci_dev *dev; |
90 | u8 byte; |
91 | u16 word; |
92 | u32 dword; |
93 | int err = 0; |
94 | |
95 | if (!capable(CAP_SYS_ADMIN)) |
96 | return -EPERM; |
97 | |
98 | dev = pci_get_bus_and_slot(bus, dfn); |
99 | if (!dev) |
100 | return -ENODEV; |
101 | |
102 | switch(len) { |
103 | case 1: |
104 | err = get_user(byte, (u8 __user *)buf); |
105 | if (err) |
106 | break; |
107 | err = pci_user_write_config_byte(dev, off, byte); |
108 | if (err != PCIBIOS_SUCCESSFUL) |
109 | err = -EIO; |
110 | break; |
111 | |
112 | case 2: |
113 | err = get_user(word, (u16 __user *)buf); |
114 | if (err) |
115 | break; |
116 | err = pci_user_write_config_word(dev, off, word); |
117 | if (err != PCIBIOS_SUCCESSFUL) |
118 | err = -EIO; |
119 | break; |
120 | |
121 | case 4: |
122 | err = get_user(dword, (u32 __user *)buf); |
123 | if (err) |
124 | break; |
125 | err = pci_user_write_config_dword(dev, off, dword); |
126 | if (err != PCIBIOS_SUCCESSFUL) |
127 | err = -EIO; |
128 | break; |
129 | |
130 | default: |
131 | err = -EINVAL; |
132 | break; |
133 | } |
134 | pci_dev_put(dev); |
135 | return err; |
136 | } |
137 |
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