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1da177e4 LT |
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 | ||
1da177e4 LT |
10 | #include <linux/errno.h> |
11 | #include <linux/pci.h> | |
12 | #include <linux/smp_lock.h> | |
13 | #include <linux/syscalls.h> | |
14 | #include <asm/uaccess.h> | |
e04b0ea2 | 15 | #include "pci.h" |
1da177e4 LT |
16 | |
17 | asmlinkage long | |
18 | sys_pciconfig_read(unsigned long bus, unsigned long dfn, | |
19 | unsigned long off, unsigned long len, | |
20 | void __user *buf) | |
21 | { | |
22 | struct pci_dev *dev; | |
23 | u8 byte; | |
24 | u16 word; | |
25 | u32 dword; | |
26 | long err, cfg_ret; | |
27 | ||
28 | err = -EPERM; | |
29 | if (!capable(CAP_SYS_ADMIN)) | |
30 | goto error; | |
31 | ||
32 | err = -ENODEV; | |
33 | dev = pci_find_slot(bus, dfn); | |
34 | if (!dev) | |
35 | goto error; | |
36 | ||
37 | lock_kernel(); | |
38 | switch (len) { | |
39 | case 1: | |
e04b0ea2 | 40 | cfg_ret = pci_user_read_config_byte(dev, off, &byte); |
1da177e4 LT |
41 | break; |
42 | case 2: | |
e04b0ea2 | 43 | cfg_ret = pci_user_read_config_word(dev, off, &word); |
1da177e4 LT |
44 | break; |
45 | case 4: | |
e04b0ea2 | 46 | cfg_ret = pci_user_read_config_dword(dev, off, &dword); |
1da177e4 LT |
47 | break; |
48 | default: | |
49 | err = -EINVAL; | |
50 | unlock_kernel(); | |
51 | goto error; | |
52 | }; | |
53 | unlock_kernel(); | |
54 | ||
55 | err = -EIO; | |
56 | if (cfg_ret != PCIBIOS_SUCCESSFUL) | |
57 | goto error; | |
58 | ||
59 | switch (len) { | |
60 | case 1: | |
61 | err = put_user(byte, (unsigned char __user *)buf); | |
62 | break; | |
63 | case 2: | |
64 | err = put_user(word, (unsigned short __user *)buf); | |
65 | break; | |
66 | case 4: | |
67 | err = put_user(dword, (unsigned int __user *)buf); | |
68 | break; | |
69 | }; | |
70 | return err; | |
71 | ||
72 | error: | |
73 | /* ??? XFree86 doesn't even check the return value. They | |
74 | just look for 0xffffffff in the output, since that's what | |
75 | they get instead of a machine check on x86. */ | |
76 | switch (len) { | |
77 | case 1: | |
78 | put_user(-1, (unsigned char __user *)buf); | |
79 | break; | |
80 | case 2: | |
81 | put_user(-1, (unsigned short __user *)buf); | |
82 | break; | |
83 | case 4: | |
84 | put_user(-1, (unsigned int __user *)buf); | |
85 | break; | |
86 | }; | |
87 | return err; | |
88 | } | |
89 | ||
90 | asmlinkage long | |
91 | sys_pciconfig_write(unsigned long bus, unsigned long dfn, | |
92 | unsigned long off, unsigned long len, | |
93 | void __user *buf) | |
94 | { | |
95 | struct pci_dev *dev; | |
96 | u8 byte; | |
97 | u16 word; | |
98 | u32 dword; | |
99 | int err = 0; | |
100 | ||
101 | if (!capable(CAP_SYS_ADMIN)) | |
102 | return -EPERM; | |
103 | ||
104 | dev = pci_find_slot(bus, dfn); | |
105 | if (!dev) | |
106 | return -ENODEV; | |
107 | ||
108 | lock_kernel(); | |
109 | switch(len) { | |
110 | case 1: | |
111 | err = get_user(byte, (u8 __user *)buf); | |
112 | if (err) | |
113 | break; | |
e04b0ea2 | 114 | err = pci_user_write_config_byte(dev, off, byte); |
1da177e4 LT |
115 | if (err != PCIBIOS_SUCCESSFUL) |
116 | err = -EIO; | |
117 | break; | |
118 | ||
119 | case 2: | |
120 | err = get_user(word, (u16 __user *)buf); | |
121 | if (err) | |
122 | break; | |
e04b0ea2 | 123 | err = pci_user_write_config_word(dev, off, word); |
1da177e4 LT |
124 | if (err != PCIBIOS_SUCCESSFUL) |
125 | err = -EIO; | |
126 | break; | |
127 | ||
128 | case 4: | |
129 | err = get_user(dword, (u32 __user *)buf); | |
130 | if (err) | |
131 | break; | |
e04b0ea2 | 132 | err = pci_user_write_config_dword(dev, off, dword); |
1da177e4 LT |
133 | if (err != PCIBIOS_SUCCESSFUL) |
134 | err = -EIO; | |
135 | break; | |
136 | ||
137 | default: | |
138 | err = -EINVAL; | |
139 | break; | |
140 | }; | |
141 | unlock_kernel(); | |
142 | ||
143 | return err; | |
144 | } |