include/asm/irq.h

14 #include <linux/radix-tree.h>
26 /* This number is used when no interrupt has been assigned */
30  * no interrupt happened _and_ ignore it (don't count it as bad). Some
33 #define NO_IRQ_IGNORE		((unsigned int)-1)
38 /* Number of irqs reserved for the legacy controller */
44 /* This type is the placeholder for a hardware interrupt number. It has to
50 /* Interrupt controller "host" data structure. This could be defined as a
51  * irq domain controller. That is, it handles the mapping between hardware
52  * and virtual interrupt numbers for a given interrupt domain. The host
59  * we use an open firmware device-tree. We do have references to struct
61  * a given interrupt controller node, and of course as an argument to its
62  * counterpart host->ops->match() callback. However, those are treated as
63  * generic pointers by the core and the fact that it's actually a device-node
66  * by some sort of arch-specific void * "token" used to identify interrupt
78 	/* Match an interrupt controller device node to a host, returns
91 	/* Translate device-tree interrupt specifier from raw format coming
92 	 * from the firmware to a irq_hw_number_t (interrupt line number) and
97 	 * interrupt controller has for that line)
134  * irq_alloc_host - Allocate a new irq_host data structure
135  * @of_node: optional device-tree node of the interrupt controller
144  * a legacy controller). For a IRQ_HOST_MAP_LINEAR, the map is allocated by
157  * irq_find_host - Locates a host for a given device node
158  * @node: device-tree node of the interrupt controller
164  * irq_set_default_host - Set a "default" host
169  * platforms that want to manipulate a few hard coded interrupt numbers that
170  * aren't properly represented in the device-tree.
176  * irq_set_virq_count - Set the maximum number of virt irqs
180  * the virtual irq number in the controller to avoid the reverse mapping
186  * irq_create_mapping - Map a hardware interrupt into linux virq space
187  * @host: host owning this hardware interrupt or NULL for default host
190  * Only one mapping per hardware interrupt is permitted. Returns a linux
200  * irq_dispose_mapping - Unmap an interrupt
201  * @virq: linux virq number of the interrupt to unmap
206  * irq_find_mapping - Find a linux virq from an hw irq number.
207  * @host: host owning this hardware interrupt
211  * irq controller implementation directly calls the appropriate low level
218  * irq_create_direct_mapping - Allocate a virq for direct mapping
222  * interrupt numbers they generate. In such a case it's simplest to use
223  * the linux virq as the hardware interrupt number.
228  * irq_radix_revmap_insert - Insert a hw irq to linux virq number mapping.
229  * @host: host owning this hardware interrupt
240  * irq_radix_revmap_lookup - Find a linux virq from a hw irq number.
241  * @host: host owning this hardware interrupt
244  * This is a fast path, for use by irq controller code that uses radix tree
251  * irq_linear_revmap - Find a linux virq from a hw irq number.
252  * @host: host owning this hardware interrupt
255  * This is a fast path, for use by irq controller code that uses linear
266  * irq_alloc_virt - Allocate virtual irq numbers
280  * irq_free_virt - Free virtual irq numbers
281  * @virq: virtual irq number of the first interrupt to free
285  * maps, this should be done previously by unmap'ing the interrupt. In fact,
292  * irq_early_init - Init irq remapping subsystem
310  * Per-cpu stacks for handling critical, debug and machine check
322  * Per-cpu stacks for handling hard and soft interrupts.