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>
17 SYSCALL_DEFINE5(pciconfig_read, unsigned long, bus, unsigned long, dfn,
18 unsigned long, off, unsigned long, len, void __user *, buf)
27 if (!capable(CAP_SYS_ADMIN))
31 dev = pci_get_bus_and_slot(bus, dfn);
37 cfg_ret = pci_user_read_config_byte(dev, off, &byte);
40 cfg_ret = pci_user_read_config_word(dev, off, &word);
43 cfg_ret = pci_user_read_config_dword(dev, off, &dword);
51 if (cfg_ret != PCIBIOS_SUCCESSFUL)
56 err = put_user(byte, (unsigned char __user *)buf);
59 err = put_user(word, (unsigned short __user *)buf);
62 err = put_user(dword, (unsigned int __user *)buf);
69 /* ??? XFree86 doesn't even check the return value. They
70 just look for 0xffffffff in the output, since that's what
71 they get instead of a machine check on x86. */
74 put_user(-1, (unsigned char __user *)buf);
77 put_user(-1, (unsigned short __user *)buf);
80 put_user(-1, (unsigned int __user *)buf);
87 SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
88 unsigned long, off, unsigned long, len, void __user *, buf)
96 if (!capable(CAP_SYS_ADMIN))
99 dev = pci_get_bus_and_slot(bus, dfn);
105 err = get_user(byte, (u8 __user *)buf);
108 err = pci_user_write_config_byte(dev, off, byte);
109 if (err != PCIBIOS_SUCCESSFUL)
114 err = get_user(word, (u16 __user *)buf);
117 err = pci_user_write_config_word(dev, off, word);
118 if (err != PCIBIOS_SUCCESSFUL)
123 err = get_user(dword, (u32 __user *)buf);
126 err = pci_user_write_config_dword(dev, off, dword);
127 if (err != PCIBIOS_SUCCESSFUL)