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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [pci/] [syscall.c] - Blame information for rev 78

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/*
 *      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;
 
        lock_kernel();
        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;
                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;
        }
        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;
 
        lock_kernel();
        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;
        }
        unlock_kernel();
        pci_dev_put(dev);
        return err;
}

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
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
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>`
15			`#include "pci.h"`
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;`
26			`long err;`
27			`long cfg_ret;`
28
29			`if (!capable(CAP_SYS_ADMIN))`
30			`return -EPERM;`
31
32			`err = -ENODEV;`
33			`dev = pci_get_bus_and_slot(bus, dfn);`
34			`if (!dev)`
35			`goto error;`
36
37			`lock_kernel();`
38			`switch (len) {`
39			`case 1:`
40			`cfg_ret = pci_user_read_config_byte(dev, off, &byte);`
41			`break;`
42			`case 2:`
43			`cfg_ret = pci_user_read_config_word(dev, off, &word);`
44			`break;`
45			`case 4:`
46			`cfg_ret = pci_user_read_config_dword(dev, off, &dword);`
47			`break;`
48			`default:`
49			`err = -EINVAL;`
50			`unlock_kernel();`
51			`goto error;`
52			`};`
53			`unlock_kernel();`
54
55			`err = -EIO;`
56			`if (cfg_ret != PCIBIOS_SUCCESSFUL)`
57			`goto error;`
58
59			`switch (len) {`
60			`case 1:`
61			`err = put_user(byte, (unsigned char __user *)buf);`
62			`break;`
63			`case 2:`
64			`err = put_user(word, (unsigned short __user *)buf);`
65			`break;`
66			`case 4:`
67			`err = put_user(dword, (unsigned int __user *)buf);`
68			`break;`
69			`}`
70			`pci_dev_put(dev);`
71			`return err;`
72
73			`error:`
74			`/* ??? XFree86 doesn't even check the return value. They`
75			`just look for 0xffffffff in the output, since that's what`
76			`they get instead of a machine check on x86. */`
77			`switch (len) {`
78			`case 1:`
79			`put_user(-1, (unsigned char __user *)buf);`
80			`break;`
81			`case 2:`
82			`put_user(-1, (unsigned short __user *)buf);`
83			`break;`
84			`case 4:`
85			`put_user(-1, (unsigned int __user *)buf);`
86			`break;`
87			`}`
88			`pci_dev_put(dev);`
89			`return err;`
90			`}`
91
92			`asmlinkage long`
93			`sys_pciconfig_write(unsigned long bus, unsigned long dfn,`
94			`unsigned long off, unsigned long len,`
95			`void __user *buf)`
96			`{`
97			`struct pci_dev *dev;`
98			`u8 byte;`
99			`u16 word;`
100			`u32 dword;`
101			`int err = 0;`
102
103			`if (!capable(CAP_SYS_ADMIN))`
104			`return -EPERM;`
105
106			`dev = pci_get_bus_and_slot(bus, dfn);`
107			`if (!dev)`
108			`return -ENODEV;`
109
110			`lock_kernel();`
111			`switch(len) {`
112			`case 1:`
113			`err = get_user(byte, (u8 __user *)buf);`
114			`if (err)`
115			`break;`
116			`err = pci_user_write_config_byte(dev, off, byte);`
117			`if (err != PCIBIOS_SUCCESSFUL)`
118			`err = -EIO;`
119			`break;`
120
121			`case 2:`
122			`err = get_user(word, (u16 __user *)buf);`
123			`if (err)`
124			`break;`
125			`err = pci_user_write_config_word(dev, off, word);`
126			`if (err != PCIBIOS_SUCCESSFUL)`
127			`err = -EIO;`
128			`break;`
129
130			`case 4:`
131			`err = get_user(dword, (u32 __user *)buf);`
132			`if (err)`
133			`break;`
134			`err = pci_user_write_config_dword(dev, off, dword);`
135			`if (err != PCIBIOS_SUCCESSFUL)`
136			`err = -EIO;`
137			`break;`
138
139			`default:`
140			`err = -EINVAL;`
141			`break;`
142			`}`
143			`unlock_kernel();`
144			`pci_dev_put(dev);`
145			`return err;`
146			`}`

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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [pci/] [syscall.c] - Blame information for rev 78