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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 587 | giacomo | 1 | /* |
| 2 | * pci_syscall.c |
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| 3 | * |
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| 4 | * For architectures where we want to allow direct access |
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| 5 | * to the PCI config stuff - it would probably be preferable |
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| 6 | * on PCs too, but there people just do it by hand with the |
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| 7 | * magic northbridge registers.. |
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| 8 | */ |
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| 9 | |||
| 10 | #include <linuxcomp.h> |
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| 11 | |||
| 12 | #include <linux/sched.h> |
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| 13 | #include <linux/errno.h> |
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| 14 | #include <linux/pci.h> |
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| 15 | #include <linux/smp_lock.h> |
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| 16 | #include <asm/uaccess.h> |
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| 17 | |||
| 18 | |||
| 19 | asmlinkage long |
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| 20 | sys_pciconfig_read(unsigned long bus, unsigned long dfn, |
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| 21 | unsigned long off, unsigned long len, void *buf) |
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| 22 | { |
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| 23 | struct pci_dev *dev; |
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| 24 | u8 byte; |
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| 25 | u16 word; |
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| 26 | u32 dword; |
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| 27 | long err, cfg_ret; |
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| 28 | |||
| 29 | err = -EPERM; |
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| 30 | if (!capable(CAP_SYS_ADMIN)) |
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| 31 | goto error; |
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| 32 | |||
| 33 | err = -ENODEV; |
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| 34 | dev = pci_find_slot(bus, dfn); |
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| 35 | if (!dev) |
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| 36 | goto error; |
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| 37 | |||
| 38 | lock_kernel(); |
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| 39 | switch (len) { |
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| 40 | case 1: |
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| 41 | cfg_ret = pci_read_config_byte(dev, off, &byte); |
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| 42 | break; |
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| 43 | case 2: |
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| 44 | cfg_ret = pci_read_config_word(dev, off, &word); |
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| 45 | break; |
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| 46 | case 4: |
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| 47 | cfg_ret = pci_read_config_dword(dev, off, &dword); |
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| 48 | break; |
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| 49 | default: |
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| 50 | err = -EINVAL; |
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| 51 | unlock_kernel(); |
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| 52 | goto error; |
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| 53 | }; |
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| 54 | unlock_kernel(); |
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| 55 | |||
| 56 | err = -EIO; |
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| 57 | if (cfg_ret != PCIBIOS_SUCCESSFUL) |
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| 58 | goto error; |
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| 59 | |||
| 60 | switch (len) { |
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| 61 | case 1: |
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| 62 | err = put_user(byte, (unsigned char *)buf); |
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| 63 | break; |
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| 64 | case 2: |
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| 65 | err = put_user(word, (unsigned short *)buf); |
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| 66 | break; |
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| 67 | case 4: |
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| 68 | err = put_user(dword, (unsigned int *)buf); |
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| 69 | break; |
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| 70 | }; |
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| 71 | return err; |
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| 72 | |||
| 73 | error: |
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| 74 | /* ??? XFree86 doesn't even check the return value. They |
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| 75 | just look for 0xffffffff in the output, since that's what |
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| 76 | they get instead of a machine check on x86. */ |
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| 77 | switch (len) { |
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| 78 | case 1: |
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| 79 | put_user(-1, (unsigned char *)buf); |
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| 80 | break; |
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| 81 | case 2: |
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| 82 | put_user(-1, (unsigned short *)buf); |
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| 83 | break; |
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| 84 | case 4: |
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| 85 | put_user(-1, (unsigned int *)buf); |
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| 86 | break; |
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| 87 | }; |
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| 88 | return err; |
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| 89 | } |
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| 90 | |||
| 91 | asmlinkage long |
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| 92 | sys_pciconfig_write(unsigned long bus, unsigned long dfn, |
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| 93 | unsigned long off, unsigned long len, void *buf) |
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| 94 | { |
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| 95 | struct pci_dev *dev; |
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| 96 | u8 byte; |
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| 97 | u16 word; |
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| 98 | u32 dword; |
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| 99 | int err = 0; |
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| 100 | |||
| 101 | if (!capable(CAP_SYS_ADMIN)) |
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| 102 | return -EPERM; |
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| 103 | |||
| 104 | dev = pci_find_slot(bus, dfn); |
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| 105 | if (!dev) |
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| 106 | return -ENODEV; |
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| 107 | |||
| 108 | lock_kernel(); |
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| 109 | switch(len) { |
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| 110 | case 1: |
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| 111 | err = get_user(byte, (u8 *)buf); |
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| 112 | if (err) |
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| 113 | break; |
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| 114 | err = pci_write_config_byte(dev, off, byte); |
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| 115 | if (err != PCIBIOS_SUCCESSFUL) |
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| 116 | err = -EIO; |
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| 117 | break; |
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| 118 | |||
| 119 | case 2: |
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| 120 | err = get_user(word, (u16 *)buf); |
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| 121 | if (err) |
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| 122 | break; |
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| 123 | err = pci_write_config_word(dev, off, word); |
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| 124 | if (err != PCIBIOS_SUCCESSFUL) |
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| 125 | err = -EIO; |
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| 126 | break; |
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| 127 | |||
| 128 | case 4: |
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| 129 | err = get_user(dword, (u32 *)buf); |
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| 130 | if (err) |
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| 131 | break; |
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| 132 | err = pci_write_config_dword(dev, off, dword); |
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| 133 | if (err != PCIBIOS_SUCCESSFUL) |
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| 134 | err = -EIO; |
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| 135 | break; |
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| 136 | |||
| 137 | default: |
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| 138 | err = -EINVAL; |
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| 139 | break; |
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| 140 | }; |
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| 141 | unlock_kernel(); |
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| 142 | |||
| 143 | return err; |
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| 144 | } |