Function report |
Source Code:arch\x86\kernel\i8259.c |
Create Date:2022-07-28 07:40:43 |
| Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
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| Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:This function assumes to be called rarely. Switching between* 8259A registers is slow.* This has to be protected by the irq controller spinlock* before being called.
Proto:static inline int i8259A_irq_real(unsigned int irq)
Type:int
Parameter:
| Type | Parameter | Name |
|---|---|---|
| unsigned int | irq |
| 132 | If irq < 8 Then |
| 133 | Basic port I/O |
| 134 | value = inb(8259A PIC registers ) & irqmask |
| 135 | Basic port I/O |
| 136 | Return value |
| 138 | Basic port I/O |
| 139 | value = inb(PIC_SLAVE_CMD) & irqmask >> 8 |
| 140 | Basic port I/O |
| 141 | Return value |
| Name | Describe |
|---|---|
| mask_and_ack_8259A | Careful! The 8259A is a fragile beast, it pretty* much _has_ to be done exactly like this (mask it* first, _then_ send the EOI, and the order of EOI* to the two 8259s is important! |
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