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 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/pci.h> | |
13 | #include <linux/smp_lock.h> | |
14 | #include <linux/syscalls.h> | |
15 | #include <asm/uaccess.h> | |
16 | ||
17 | ||
18 | asmlinkage long | |
19 | sys_pciconfig_read(unsigned long bus, unsigned long dfn, | |
20 | unsigned long off, unsigned long len, | |
21 | void __user *buf) | |
22 | { | |
23 | struct pci_dev *dev; | |
24 | u8 byte; | |
25 | u16 word; | |
26 | u32 dword; | |
27 | long err, cfg_ret; | |
28 | ||
29 | err = -EPERM; | |
30 | if (!capable(CAP_SYS_ADMIN)) | |
31 | goto error; | |
32 | ||
33 | err = -ENODEV; | |
34 | dev = pci_find_slot(bus, dfn); | |
35 | if (!dev) | |
36 | goto error; | |
37 | ||
38 | lock_kernel(); | |
39 | switch (len) { | |
40 | case 1: | |
41 | cfg_ret = pci_read_config_byte(dev, off, &byte); | |
42 | break; | |
43 | case 2: | |
44 | cfg_ret = pci_read_config_word(dev, off, &word); | |
45 | break; | |
46 | case 4: | |
47 | cfg_ret = pci_read_config_dword(dev, off, &dword); | |
48 | break; | |
49 | default: | |
50 | err = -EINVAL; | |
51 | unlock_kernel(); | |
52 | goto error; | |
53 | }; | |
54 | unlock_kernel(); | |
55 | ||
56 | err = -EIO; | |
57 | if (cfg_ret != PCIBIOS_SUCCESSFUL) | |
58 | goto error; | |
59 | ||
60 | switch (len) { | |
61 | case 1: | |
62 | err = put_user(byte, (unsigned char __user *)buf); | |
63 | break; | |
64 | case 2: | |
65 | err = put_user(word, (unsigned short __user *)buf); | |
66 | break; | |
67 | case 4: | |
68 | err = put_user(dword, (unsigned int __user *)buf); | |
69 | break; | |
70 | }; | |
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; | |
87 | }; | |
88 | return err; | |
89 | } | |
90 | ||
91 | asmlinkage long | |
92 | sys_pciconfig_write(unsigned long bus, unsigned long dfn, | |
93 | unsigned long off, unsigned long len, | |
94 | void __user *buf) | |
95 | { | |
96 | struct pci_dev *dev; | |
97 | u8 byte; | |
98 | u16 word; | |
99 | u32 dword; | |
100 | int err = 0; | |
101 | ||
102 | if (!capable(CAP_SYS_ADMIN)) | |
103 | return -EPERM; | |
104 | ||
105 | dev = pci_find_slot(bus, dfn); | |
106 | if (!dev) | |
107 | return -ENODEV; | |
108 | ||
109 | lock_kernel(); | |
110 | switch(len) { | |
111 | case 1: | |
112 | err = get_user(byte, (u8 __user *)buf); | |
113 | if (err) | |
114 | break; | |
115 | err = pci_write_config_byte(dev, off, byte); | |
116 | if (err != PCIBIOS_SUCCESSFUL) | |
117 | err = -EIO; | |
118 | break; | |
119 | ||
120 | case 2: | |
121 | err = get_user(word, (u16 __user *)buf); | |
122 | if (err) | |
123 | break; | |
124 | err = pci_write_config_word(dev, off, word); | |
125 | if (err != PCIBIOS_SUCCESSFUL) | |
126 | err = -EIO; | |
127 | break; | |
128 | ||
129 | case 4: | |
130 | err = get_user(dword, (u32 __user *)buf); | |
131 | if (err) | |
132 | break; | |
133 | err = pci_write_config_dword(dev, off, dword); | |
134 | if (err != PCIBIOS_SUCCESSFUL) | |
135 | err = -EIO; | |
136 | break; | |
137 | ||
138 | default: | |
139 | err = -EINVAL; | |
140 | break; | |
141 | }; | |
142 | unlock_kernel(); | |
143 | ||
144 | return err; | |
145 | } |