Commit | Line | Data |
---|---|---|
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 | 16 | |
c4ea37c2 HC |
17 | SYSCALL_DEFINE5(pciconfig_read, unsigned long, bus, unsigned long, dfn, |
18 | unsigned long, off, unsigned long, len, void __user *, buf) | |
1da177e4 LT |
19 | { |
20 | struct pci_dev *dev; | |
21 | u8 byte; | |
22 | u16 word; | |
23 | u32 dword; | |
e4585da2 AC |
24 | long err; |
25 | long cfg_ret; | |
1da177e4 | 26 | |
1da177e4 | 27 | if (!capable(CAP_SYS_ADMIN)) |
e4585da2 | 28 | return -EPERM; |
1da177e4 LT |
29 | |
30 | err = -ENODEV; | |
e4585da2 | 31 | dev = pci_get_bus_and_slot(bus, dfn); |
1da177e4 LT |
32 | if (!dev) |
33 | goto error; | |
34 | ||
1da177e4 LT |
35 | switch (len) { |
36 | case 1: | |
e04b0ea2 | 37 | cfg_ret = pci_user_read_config_byte(dev, off, &byte); |
1da177e4 LT |
38 | break; |
39 | case 2: | |
e04b0ea2 | 40 | cfg_ret = pci_user_read_config_word(dev, off, &word); |
1da177e4 LT |
41 | break; |
42 | case 4: | |
e04b0ea2 | 43 | cfg_ret = pci_user_read_config_dword(dev, off, &dword); |
1da177e4 LT |
44 | break; |
45 | default: | |
46 | err = -EINVAL; | |
1da177e4 LT |
47 | goto error; |
48 | }; | |
1da177e4 LT |
49 | |
50 | err = -EIO; | |
51 | if (cfg_ret != PCIBIOS_SUCCESSFUL) | |
52 | goto error; | |
53 | ||
54 | switch (len) { | |
55 | case 1: | |
56 | err = put_user(byte, (unsigned char __user *)buf); | |
57 | break; | |
58 | case 2: | |
59 | err = put_user(word, (unsigned short __user *)buf); | |
60 | break; | |
61 | case 4: | |
62 | err = put_user(dword, (unsigned int __user *)buf); | |
63 | break; | |
e4585da2 AC |
64 | } |
65 | pci_dev_put(dev); | |
1da177e4 LT |
66 | return err; |
67 | ||
68 | error: | |
69 | /* ??? XFree86 doesn't even check the return value. They | |
70 | just look for 0xffffffff in the output, since that's what | |
71 | they get instead of a machine check on x86. */ | |
72 | switch (len) { | |
73 | case 1: | |
74 | put_user(-1, (unsigned char __user *)buf); | |
75 | break; | |
76 | case 2: | |
77 | put_user(-1, (unsigned short __user *)buf); | |
78 | break; | |
79 | case 4: | |
80 | put_user(-1, (unsigned int __user *)buf); | |
81 | break; | |
e4585da2 AC |
82 | } |
83 | pci_dev_put(dev); | |
1da177e4 LT |
84 | return err; |
85 | } | |
86 | ||
c4ea37c2 HC |
87 | SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn, |
88 | unsigned long, off, unsigned long, len, void __user *, buf) | |
1da177e4 LT |
89 | { |
90 | struct pci_dev *dev; | |
91 | u8 byte; | |
92 | u16 word; | |
93 | u32 dword; | |
94 | int err = 0; | |
95 | ||
96 | if (!capable(CAP_SYS_ADMIN)) | |
97 | return -EPERM; | |
98 | ||
e4585da2 | 99 | dev = pci_get_bus_and_slot(bus, dfn); |
1da177e4 LT |
100 | if (!dev) |
101 | return -ENODEV; | |
102 | ||
1da177e4 LT |
103 | switch(len) { |
104 | case 1: | |
105 | err = get_user(byte, (u8 __user *)buf); | |
106 | if (err) | |
107 | break; | |
e04b0ea2 | 108 | err = pci_user_write_config_byte(dev, off, byte); |
1da177e4 LT |
109 | if (err != PCIBIOS_SUCCESSFUL) |
110 | err = -EIO; | |
111 | break; | |
112 | ||
113 | case 2: | |
114 | err = get_user(word, (u16 __user *)buf); | |
115 | if (err) | |
116 | break; | |
e04b0ea2 | 117 | err = pci_user_write_config_word(dev, off, word); |
1da177e4 LT |
118 | if (err != PCIBIOS_SUCCESSFUL) |
119 | err = -EIO; | |
120 | break; | |
121 | ||
122 | case 4: | |
123 | err = get_user(dword, (u32 __user *)buf); | |
124 | if (err) | |
125 | break; | |
e04b0ea2 | 126 | err = pci_user_write_config_dword(dev, off, dword); |
1da177e4 LT |
127 | if (err != PCIBIOS_SUCCESSFUL) |
128 | err = -EIO; | |
129 | break; | |
130 | ||
131 | default: | |
132 | err = -EINVAL; | |
133 | break; | |
e4585da2 | 134 | } |
e4585da2 | 135 | pci_dev_put(dev); |
1da177e4 LT |
136 | return err; |
137 | } |