include/linux/isa.h
Source file repositories/reference/linux-study-clean/include/linux/isa.h
File Facts
- System
- Linux kernel
- Corpus path
include/linux/isa.h- Extension
.h- Size
- 3407 bytes
- Lines
- 106
- Domain
- Core OS
- Bucket
- Core Kernel Interface
- Inferred role
- Core OS: operation-table or driver-model contract
- Status
- pattern implementation candidate
Why This File Exists
Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
- Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
- Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/device.hlinux/errno.hlinux/kernel.h
Detected Declarations
struct isa_driverfunction isa_register_driverfunction isa_unregister_driver
Annotated Snippet
struct device_driver driver;
struct device *devices;
};
#define to_isa_driver(x) container_of((x), struct isa_driver, driver)
#ifdef CONFIG_ISA_BUS_API
int isa_register_driver(struct isa_driver *, unsigned int);
void isa_unregister_driver(struct isa_driver *);
#else
static inline int isa_register_driver(struct isa_driver *d, unsigned int i)
{
return -ENODEV;
}
static inline void isa_unregister_driver(struct isa_driver *d)
{
}
#endif
#define module_isa_driver_init(__isa_driver, __num_isa_dev) \
static int __init __isa_driver##_init(void) \
{ \
return isa_register_driver(&(__isa_driver), __num_isa_dev); \
} \
module_init(__isa_driver##_init)
#define module_isa_driver_with_irq_init(__isa_driver, __num_isa_dev, __num_irq) \
static int __init __isa_driver##_init(void) \
{ \
if (__num_irq != __num_isa_dev) { \
pr_err("%s: Number of irq (%u) does not match number of base (%u)\n", \
__isa_driver.driver.name, __num_irq, __num_isa_dev); \
return -EINVAL; \
} \
return isa_register_driver(&(__isa_driver), __num_isa_dev); \
} \
module_init(__isa_driver##_init)
#define module_isa_driver_exit(__isa_driver) \
static void __exit __isa_driver##_exit(void) \
{ \
isa_unregister_driver(&(__isa_driver)); \
} \
module_exit(__isa_driver##_exit)
/**
* module_isa_driver() - Helper macro for registering a ISA driver
* @__isa_driver: isa_driver struct
* @__num_isa_dev: number of devices to register
*
* Helper macro for ISA drivers which do not do anything special in module
* init/exit. This eliminates a lot of boilerplate code. Each module may only
* use this macro once, and calling it replaces module_init and module_exit.
*/
#define module_isa_driver(__isa_driver, __num_isa_dev) \
module_isa_driver_init(__isa_driver, __num_isa_dev); \
module_isa_driver_exit(__isa_driver)
/**
* module_isa_driver_with_irq() - Helper macro for registering an ISA driver with irq
* @__isa_driver: isa_driver struct
* @__num_isa_dev: number of devices to register
* @__num_irq: number of IRQ to register
*
* Helper macro for ISA drivers with irq that do not do anything special in
* module init/exit. Each module may only use this macro once, and calling it
* replaces module_init and module_exit.
*/
#define module_isa_driver_with_irq(__isa_driver, __num_isa_dev, __num_irq) \
module_isa_driver_with_irq_init(__isa_driver, __num_isa_dev, __num_irq); \
module_isa_driver_exit(__isa_driver)
/**
* max_num_isa_dev() - Maximum possible number registered of an ISA device
* @__ida_dev_ext: ISA device address extent
*
* The highest base address possible for an ISA device is 0x3FF; this results in
* 1024 possible base addresses. Dividing the number of possible base addresses
* by the address extent taken by each device results in the maximum number of
* devices on a system.
*/
#define max_num_isa_dev(__isa_dev_ext) (1024 / __isa_dev_ext)
#endif /* __LINUX_ISA_H */
Annotation
- Immediate include surface: `linux/device.h`, `linux/errno.h`, `linux/kernel.h`.
- Detected declarations: `struct isa_driver`, `function isa_register_driver`, `function isa_unregister_driver`.
- Atlas domain: Core OS / Core Kernel Interface.
- Implementation status: pattern implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.