mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-25 10:59:05 +00:00
1da177e4c3
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!
146 lines
2.7 KiB
C
146 lines
2.7 KiB
C
/*
|
|
* 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;
|
|
}
|