[deliverable/linux.git] / drivers / pci / syscall.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/errno.h>
#include <linux/pci.h>
#include <linux/smp_lock.h>
#include <linux/syscalls.h>
#include <asm/uaccess.h>
#include "pci.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;
	long cfg_ret;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	err = -ENODEV;
	dev = pci_get_bus_and_slot(bus, dfn);
	if (!dev)
		goto error;

	switch (len) {
	case 1:
		cfg_ret = pci_user_read_config_byte(dev, off, &byte);
		break;
	case 2:
		cfg_ret = pci_user_read_config_word(dev, off, &word);
		break;
	case 4:
		cfg_ret = pci_user_read_config_dword(dev, off, &dword);
		break;
	default:
		err = -EINVAL;
		goto error;
	};

	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;
	}
	pci_dev_put(dev);
	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;
	}
	pci_dev_put(dev);
	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_get_bus_and_slot(bus, dfn);
	if (!dev)
		return -ENODEV;

	switch(len) {
	case 1:
		err = get_user(byte, (u8 __user *)buf);
		if (err)
			break;
		err = pci_user_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_user_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_user_write_config_dword(dev, off, dword);
		if (err != PCIBIOS_SUCCESSFUL)
			err = -EIO;
		break;

	default:
		err = -EINVAL;
		break;
	}
	pci_dev_put(dev);
	return err;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* pci_syscall.c
	3	*
	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..
	8	*/
	9
1da177e4 LT	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>
e04b0ea2	15	#include "pci.h"
1da177e4 LT	16
	17	asmlinkage long
	18	sys_pciconfig_read(unsigned long bus, unsigned long dfn,
	19	unsigned long off, unsigned long len,
	20	void __user *buf)
	21	{
	22	struct pci_dev *dev;
	23	u8 byte;
	24	u16 word;
	25	u32 dword;
e4585da2 AC	26	long err;
e4585da2 AC	27	long cfg_ret;
1da177e4	28
1da177e4	29	if (!capable(CAP_SYS_ADMIN))
e4585da2	30	return -EPERM;
1da177e4 LT	31
1da177e4 LT	32	err = -ENODEV;
e4585da2	33	dev = pci_get_bus_and_slot(bus, dfn);
1da177e4 LT	34	if (!dev)
	35	goto error;
	36
1da177e4 LT	37	switch (len) {
1da177e4 LT	38	case 1:
e04b0ea2	39	cfg_ret = pci_user_read_config_byte(dev, off, &byte);
1da177e4 LT	40	break;
1da177e4 LT	41	case 2:
e04b0ea2	42	cfg_ret = pci_user_read_config_word(dev, off, &word);
1da177e4 LT	43	break;
1da177e4 LT	44	case 4:
e04b0ea2	45	cfg_ret = pci_user_read_config_dword(dev, off, &dword);
1da177e4 LT	46	break;
	47	default:
	48	err = -EINVAL;
1da177e4 LT	49	goto error;
1da177e4 LT	50	};
1da177e4 LT	51
	52	err = -EIO;
	53	if (cfg_ret != PCIBIOS_SUCCESSFUL)
	54	goto error;
	55
	56	switch (len) {
	57	case 1:
	58	err = put_user(byte, (unsigned char __user *)buf);
	59	break;
	60	case 2:
	61	err = put_user(word, (unsigned short __user *)buf);
	62	break;
	63	case 4:
	64	err = put_user(dword, (unsigned int __user *)buf);
	65	break;
e4585da2 AC	66	}
e4585da2 AC	67	pci_dev_put(dev);
1da177e4 LT	68	return err;
	69
	70	error:
	71	/* ??? XFree86 doesn't even check the return value. They
	72	just look for 0xffffffff in the output, since that's what
	73	they get instead of a machine check on x86. */
	74	switch (len) {
	75	case 1:
	76	put_user(-1, (unsigned char __user *)buf);
	77	break;
	78	case 2:
	79	put_user(-1, (unsigned short __user *)buf);
	80	break;
	81	case 4:
	82	put_user(-1, (unsigned int __user *)buf);
	83	break;
e4585da2 AC	84	}
e4585da2 AC	85	pci_dev_put(dev);
1da177e4 LT	86	return err;
	87	}
	88
	89	asmlinkage long
	90	sys_pciconfig_write(unsigned long bus, unsigned long dfn,
	91	unsigned long off, unsigned long len,
	92	void __user *buf)
	93	{
	94	struct pci_dev *dev;
	95	u8 byte;
	96	u16 word;
	97	u32 dword;
	98	int err = 0;
	99
	100	if (!capable(CAP_SYS_ADMIN))
	101	return -EPERM;
	102
e4585da2	103	dev = pci_get_bus_and_slot(bus, dfn);
1da177e4 LT	104	if (!dev)
	105	return -ENODEV;
	106
1da177e4 LT	107	switch(len) {
	108	case 1:
	109	err = get_user(byte, (u8 __user *)buf);
	110	if (err)
	111	break;
e04b0ea2	112	err = pci_user_write_config_byte(dev, off, byte);
1da177e4 LT	113	if (err != PCIBIOS_SUCCESSFUL)
	114	err = -EIO;
	115	break;
	116
	117	case 2:
	118	err = get_user(word, (u16 __user *)buf);
	119	if (err)
	120	break;
e04b0ea2	121	err = pci_user_write_config_word(dev, off, word);
1da177e4 LT	122	if (err != PCIBIOS_SUCCESSFUL)
	123	err = -EIO;
	124	break;
	125
	126	case 4:
	127	err = get_user(dword, (u32 __user *)buf);
	128	if (err)
	129	break;
e04b0ea2	130	err = pci_user_write_config_dword(dev, off, dword);
1da177e4 LT	131	if (err != PCIBIOS_SUCCESSFUL)
	132	err = -EIO;
	133	break;
	134
	135	default:
	136	err = -EINVAL;
	137	break;
e4585da2	138	}
e4585da2	139	pci_dev_put(dev);
1da177e4 LT	140	return err;
1da177e4 LT	141	}