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!

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;
+}