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 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; | |
e4585da2 AC |
26 | long err; |
27 | long cfg_ret; | |
1da177e4 | 28 | |
1da177e4 | 29 | if (!capable(CAP_SYS_ADMIN)) |
e4585da2 | 30 | return -EPERM; |
1da177e4 LT |
31 | |
32 | err = -ENODEV; | |
e4585da2 | 33 | dev = pci_get_bus_and_slot(bus, dfn); |
1da177e4 LT |
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; | |
e4585da2 AC |
69 | } |
70 | pci_dev_put(dev); | |
1da177e4 LT |
71 | return err; |
72 | ||
73 | error: | |
74 | /* ??? XFree86 doesn't even check the return value. They | |
75 | just look for 0xffffffff in the output, since that's what | |
76 | they get instead of a machine check on x86. */ | |
77 | switch (len) { | |
78 | case 1: | |
79 | put_user(-1, (unsigned char __user *)buf); | |
80 | break; | |
81 | case 2: | |
82 | put_user(-1, (unsigned short __user *)buf); | |
83 | break; | |
84 | case 4: | |
85 | put_user(-1, (unsigned int __user *)buf); | |
86 | break; | |
e4585da2 AC |
87 | } |
88 | pci_dev_put(dev); | |
1da177e4 LT |
89 | return err; |
90 | } | |
91 | ||
92 | asmlinkage long | |
93 | sys_pciconfig_write(unsigned long bus, unsigned long dfn, | |
94 | unsigned long off, unsigned long len, | |
95 | void __user *buf) | |
96 | { | |
97 | struct pci_dev *dev; | |
98 | u8 byte; | |
99 | u16 word; | |
100 | u32 dword; | |
101 | int err = 0; | |
102 | ||
103 | if (!capable(CAP_SYS_ADMIN)) | |
104 | return -EPERM; | |
105 | ||
e4585da2 | 106 | dev = pci_get_bus_and_slot(bus, dfn); |
1da177e4 LT |
107 | if (!dev) |
108 | return -ENODEV; | |
109 | ||
110 | lock_kernel(); | |
111 | switch(len) { | |
112 | case 1: | |
113 | err = get_user(byte, (u8 __user *)buf); | |
114 | if (err) | |
115 | break; | |
e04b0ea2 | 116 | err = pci_user_write_config_byte(dev, off, byte); |
1da177e4 LT |
117 | if (err != PCIBIOS_SUCCESSFUL) |
118 | err = -EIO; | |
119 | break; | |
120 | ||
121 | case 2: | |
122 | err = get_user(word, (u16 __user *)buf); | |
123 | if (err) | |
124 | break; | |
e04b0ea2 | 125 | err = pci_user_write_config_word(dev, off, word); |
1da177e4 LT |
126 | if (err != PCIBIOS_SUCCESSFUL) |
127 | err = -EIO; | |
128 | break; | |
129 | ||
130 | case 4: | |
131 | err = get_user(dword, (u32 __user *)buf); | |
132 | if (err) | |
133 | break; | |
e04b0ea2 | 134 | err = pci_user_write_config_dword(dev, off, dword); |
1da177e4 LT |
135 | if (err != PCIBIOS_SUCCESSFUL) |
136 | err = -EIO; | |
137 | break; | |
138 | ||
139 | default: | |
140 | err = -EINVAL; | |
141 | break; | |
e4585da2 | 142 | } |
1da177e4 | 143 | unlock_kernel(); |
e4585da2 | 144 | pci_dev_put(dev); |
1da177e4 LT |
145 | return err; |
146 | } |