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)
28 if (!capable(CAP_SYS_ADMIN))
32 dev = pci_get_bus_and_slot(bus, dfn);
38 cfg_ret = pci_user_read_config_byte(dev, off, &byte);
41 cfg_ret = pci_user_read_config_word(dev, off, &word);
44 cfg_ret = pci_user_read_config_dword(dev, off, &dword);
57 err = put_user(byte, (unsigned char __user *)buf);
60 err = put_user(word, (unsigned short __user *)buf);
63 err = put_user(dword, (unsigned int __user *)buf);
70 /* ??? XFree86 doesn't even check the return value. They
71 just look for 0xffffffff in the output, since that's what
72 they get instead of a machine check on x86. */
75 put_user(-1, (unsigned char __user *)buf);
78 put_user(-1, (unsigned short __user *)buf);
81 put_user(-1, (unsigned int __user *)buf);
88 SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
89 unsigned long, off, unsigned long, len, void __user *, buf)
97 if (!capable(CAP_SYS_ADMIN))
100 dev = pci_get_bus_and_slot(bus, dfn);
106 err = get_user(byte, (u8 __user *)buf);
109 err = pci_user_write_config_byte(dev, off, byte);
115 err = get_user(word, (u16 __user *)buf);
118 err = pci_user_write_config_word(dev, off, word);
124 err = get_user(dword, (u32 __user *)buf);
127 err = pci_user_write_config_dword(dev, off, dword);