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LZ看一下源码中driver/pci/access.c的代码
- #define PCI_byte_BAD 0
- #define PCI_word_BAD (pos & 1)
- #define PCI_dword_BAD (pos & 3)
- #define PCI_OP_READ(size,type,len) \
- int pci_bus_read_config_##size \
- (struct pci_bus *bus, unsigned int devfn, int pos, type *value) \
- { \
- int res; \
- unsigned long flags; \
- u32 data = 0; \
- if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \
- spin_lock_irqsave(&pci_lock, flags); \
- res = bus->ops->read(bus, devfn, pos, len, &data); \
- *value = (type)data; \
- spin_unlock_irqrestore(&pci_lock, flags); \
- return res; \
- }
- #define PCI_OP_WRITE(size,type,len) \
- int pci_bus_write_config_##size \
- (struct pci_bus *bus, unsigned int devfn, int pos, type value) \
- { \
- int res; \
- unsigned long flags; \
- if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \
- spin_lock_irqsave(&pci_lock, flags); \
- res = bus->ops->write(bus, devfn, pos, len, value); \
- spin_unlock_irqrestore(&pci_lock, flags); \
- return res; \
- }
- PCI_OP_READ(byte, u8, 1)
- PCI_OP_READ(word, u16, 2)
- PCI_OP_READ(dword, u32, 4)
- PCI_OP_WRITE(byte, u8, 1)
- PCI_OP_WRITE(word, u16, 2)
- PCI_OP_WRITE(dword, u32, 4)
- EXPORT_SYMBOL(pci_bus_read_config_byte);
- EXPORT_SYMBOL(pci_bus_read_config_word);
- EXPORT_SYMBOL(pci_bus_read_config_dword);
- EXPORT_SYMBOL(pci_bus_write_config_byte);
- EXPORT_SYMBOL(pci_bus_write_config_word);
- EXPORT_SYMBOL(pci_bus_write_config_dword);
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