i8259 Chip Support
More...
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file | i8259.h |
| Data structure and functions used to control i8259 chip.
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#define | ISA8259_M_ELCR 0x4d0 |
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#define | ISA8259_S_ELCR 0x4d1 |
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#define | ELCRS_INT15_LVL 0x80 |
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#define | ELCRS_INT14_LVL 0x40 |
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#define | ELCRS_INT13_LVL 0x20 |
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#define | ELCRS_INT12_LVL 0x10 |
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#define | ELCRS_INT11_LVL 0x08 |
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#define | ELCRS_INT10_LVL 0x04 |
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#define | ELCRS_INT9_LVL 0x02 |
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#define | ELCRS_INT8_LVL 0x01 |
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#define | ELCRM_INT7_LVL 0x80 |
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#define | ELCRM_INT6_LVL 0x40 |
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#define | ELCRM_INT5_LVL 0x20 |
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#define | ELCRM_INT4_LVL 0x10 |
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#define | ELCRM_INT3_LVL 0x8 |
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#define | ELCRM_INT2_LVL 0x4 |
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#define | ELCRM_INT1_LVL 0x2 |
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#define | ELCRM_INT0_LVL 0x1 |
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#define | PIC_EOSI 0x60 |
| End of Specific Interrupt (EOSI) */.
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#define | SLAVE_PIC_EOSI 0x62 |
| End of Specific Interrupt (EOSI) for cascade */.
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#define | PIC_EOI 0x20 |
| Generic End of Interrupt (EOI) */.
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void | BSP_i8259s_init (void) |
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int | BSP_irq_disable_at_i8259s (const rtems_irq_number irqLine) |
| function to disable a particular irq at 8259 level. More...
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int | BSP_irq_enable_at_i8259s (const rtems_irq_number irqLine) |
| function to enable a particular irq at 8259 level. More...
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int | BSP_irq_ack_at_i8259s (const rtems_irq_number irqLine) |
| function to acknowledge a particular irq at 8259 level. More...
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int | BSP_irq_enabled_at_i8259s (const rtems_irq_number irqLine) |
| function to check if a particular irq is enabled at 8259 level.
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int | BSP_i8259s_int_process (void) |
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void | BSP_rtems_irq_mng_init (unsigned cpuId) |
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i8259 Chip Support
◆ BSP_irq_ack_at_i8259s()
int BSP_irq_ack_at_i8259s |
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const rtems_irq_number |
irqLine | ) |
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function to acknowledge a particular irq at 8259 level.
After calling this function, if a device asserts an enabled interrupt line it will be propagated further to the processor. Mainly useful for people writing raw handlers as this is automagically done for RTEMS managed handlers.
◆ BSP_irq_disable_at_i8259s()
int BSP_irq_disable_at_i8259s |
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const rtems_irq_number |
irqLine | ) |
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function to disable a particular irq at 8259 level.
After calling this function, even if the device asserts the interrupt line it will not be propagated further to the processor.
- Return values
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1 | the interrupt was enabled originally |
0 | the interrupt was disabled originally |
<0 | error |
◆ BSP_irq_enable_at_i8259s()
int BSP_irq_enable_at_i8259s |
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const rtems_irq_number |
irqLine | ) |
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function to enable a particular irq at 8259 level.
After calling this function, if the device asserts the interrupt line it will be propagated further to the processor.