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..
10 #include <linux/errno.h>
11 #include <linux/pci.h>
12 #include <linux/syscalls.h>
13 #include <asm/uaccess.h>
16 SYSCALL_DEFINE5(pciconfig_read
, unsigned long, bus
, unsigned long, dfn
,
17 unsigned long, off
, unsigned long, len
, void __user
*, buf
)
26 if (!capable(CAP_SYS_ADMIN
))
30 dev
= pci_get_bus_and_slot(bus
, dfn
);
36 cfg_ret
= pci_user_read_config_byte(dev
, off
, &byte
);
39 cfg_ret
= pci_user_read_config_word(dev
, off
, &word
);
42 cfg_ret
= pci_user_read_config_dword(dev
, off
, &dword
);
50 if (cfg_ret
!= PCIBIOS_SUCCESSFUL
)
55 err
= put_user(byte
, (unsigned char __user
*)buf
);
58 err
= put_user(word
, (unsigned short __user
*)buf
);
61 err
= put_user(dword
, (unsigned int __user
*)buf
);
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. */
73 put_user(-1, (unsigned char __user
*)buf
);
76 put_user(-1, (unsigned short __user
*)buf
);
79 put_user(-1, (unsigned int __user
*)buf
);
86 SYSCALL_DEFINE5(pciconfig_write
, unsigned long, bus
, unsigned long, dfn
,
87 unsigned long, off
, unsigned long, len
, void __user
*, buf
)
95 if (!capable(CAP_SYS_ADMIN
))
98 dev
= pci_get_bus_and_slot(bus
, dfn
);
104 err
= get_user(byte
, (u8 __user
*)buf
);
107 err
= pci_user_write_config_byte(dev
, off
, byte
);
108 if (err
!= PCIBIOS_SUCCESSFUL
)
113 err
= get_user(word
, (u16 __user
*)buf
);
116 err
= pci_user_write_config_word(dev
, off
, word
);
117 if (err
!= PCIBIOS_SUCCESSFUL
)
122 err
= get_user(dword
, (u32 __user
*)buf
);
125 err
= pci_user_write_config_dword(dev
, off
, dword
);
126 if (err
!= PCIBIOS_SUCCESSFUL
)
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