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/smp_lock.h>
13 #include <linux/syscalls.h>
14 #include <asm/uaccess.h>
18 sys_pciconfig_read(unsigned long bus
, unsigned long dfn
,
19 unsigned long off
, unsigned long len
,
29 if (!capable(CAP_SYS_ADMIN
))
33 dev
= pci_get_bus_and_slot(bus
, dfn
);
39 cfg_ret
= pci_user_read_config_byte(dev
, off
, &byte
);
42 cfg_ret
= pci_user_read_config_word(dev
, off
, &word
);
45 cfg_ret
= pci_user_read_config_dword(dev
, off
, &dword
);
53 if (cfg_ret
!= PCIBIOS_SUCCESSFUL
)
58 err
= put_user(byte
, (unsigned char __user
*)buf
);
61 err
= put_user(word
, (unsigned short __user
*)buf
);
64 err
= put_user(dword
, (unsigned int __user
*)buf
);
71 /* ??? XFree86 doesn't even check the return value. They
72 just look for 0xffffffff in the output, since that's what
73 they get instead of a machine check on x86. */
76 put_user(-1, (unsigned char __user
*)buf
);
79 put_user(-1, (unsigned short __user
*)buf
);
82 put_user(-1, (unsigned int __user
*)buf
);
90 sys_pciconfig_write(unsigned long bus
, unsigned long dfn
,
91 unsigned long off
, unsigned long len
,
100 if (!capable(CAP_SYS_ADMIN
))
103 dev
= pci_get_bus_and_slot(bus
, dfn
);
109 err
= get_user(byte
, (u8 __user
*)buf
);
112 err
= pci_user_write_config_byte(dev
, off
, byte
);
113 if (err
!= PCIBIOS_SUCCESSFUL
)
118 err
= get_user(word
, (u16 __user
*)buf
);
121 err
= pci_user_write_config_word(dev
, off
, word
);
122 if (err
!= PCIBIOS_SUCCESSFUL
)
127 err
= get_user(dword
, (u32 __user
*)buf
);
130 err
= pci_user_write_config_dword(dev
, off
, dword
);
131 if (err
!= PCIBIOS_SUCCESSFUL
)
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