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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/pci/syscall.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/pci/syscall.c')
-rw-r--r-- | drivers/pci/syscall.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/drivers/pci/syscall.c b/drivers/pci/syscall.c new file mode 100644 index 000000000000..c071790cc983 --- /dev/null +++ b/drivers/pci/syscall.c @@ -0,0 +1,145 @@ +/* + * pci_syscall.c + * + * For architectures where we want to allow direct access + * to the PCI config stuff - it would probably be preferable + * on PCs too, but there people just do it by hand with the + * magic northbridge registers.. + */ + +#include <linux/sched.h> +#include <linux/errno.h> +#include <linux/pci.h> +#include <linux/smp_lock.h> +#include <linux/syscalls.h> +#include <asm/uaccess.h> + + +asmlinkage long +sys_pciconfig_read(unsigned long bus, unsigned long dfn, + unsigned long off, unsigned long len, + void __user *buf) +{ + struct pci_dev *dev; + u8 byte; + u16 word; + u32 dword; + long err, cfg_ret; + + err = -EPERM; + if (!capable(CAP_SYS_ADMIN)) + goto error; + + err = -ENODEV; + dev = pci_find_slot(bus, dfn); + if (!dev) + goto error; + + lock_kernel(); + switch (len) { + case 1: + cfg_ret = pci_read_config_byte(dev, off, &byte); + break; + case 2: + cfg_ret = pci_read_config_word(dev, off, &word); + break; + case 4: + cfg_ret = pci_read_config_dword(dev, off, &dword); + break; + default: + err = -EINVAL; + unlock_kernel(); + goto error; + }; + unlock_kernel(); + + err = -EIO; + if (cfg_ret != PCIBIOS_SUCCESSFUL) + goto error; + + switch (len) { + case 1: + err = put_user(byte, (unsigned char __user *)buf); + break; + case 2: + err = put_user(word, (unsigned short __user *)buf); + break; + case 4: + err = put_user(dword, (unsigned int __user *)buf); + break; + }; + return err; + +error: + /* ??? XFree86 doesn't even check the return value. They + just look for 0xffffffff in the output, since that's what + they get instead of a machine check on x86. */ + switch (len) { + case 1: + put_user(-1, (unsigned char __user *)buf); + break; + case 2: + put_user(-1, (unsigned short __user *)buf); + break; + case 4: + put_user(-1, (unsigned int __user *)buf); + break; + }; + return err; +} + +asmlinkage long +sys_pciconfig_write(unsigned long bus, unsigned long dfn, + unsigned long off, unsigned long len, + void __user *buf) +{ + struct pci_dev *dev; + u8 byte; + u16 word; + u32 dword; + int err = 0; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + dev = pci_find_slot(bus, dfn); + if (!dev) + return -ENODEV; + + lock_kernel(); + switch(len) { + case 1: + err = get_user(byte, (u8 __user *)buf); + if (err) + break; + err = pci_write_config_byte(dev, off, byte); + if (err != PCIBIOS_SUCCESSFUL) + err = -EIO; + break; + + case 2: + err = get_user(word, (u16 __user *)buf); + if (err) + break; + err = pci_write_config_word(dev, off, word); + if (err != PCIBIOS_SUCCESSFUL) + err = -EIO; + break; + + case 4: + err = get_user(dword, (u32 __user *)buf); + if (err) + break; + err = pci_write_config_dword(dev, off, dword); + if (err != PCIBIOS_SUCCESSFUL) + err = -EIO; + break; + + default: + err = -EINVAL; + break; + }; + unlock_kernel(); + + return err; +} |