5c0927e108
- this patch fixes a deadlock which may occur if we get a spurious interrupt while calibrating clocks during the boot time. Since we never handle interrupts while in the kernel (BKL locked) the interrupt code locks the lock. This is a different situation, a corner case, boot time only. We do not return to userspace but to the kernel, so the BKL is not unlocked. So we need irq handler which leaves the BKL unlocked. The clock handler does it already, this patch adds a dummy spurious irq handler for the same reason. It is better to handle the situation this way to keep the normal runtime code simple.
66 lines
2.6 KiB
C
66 lines
2.6 KiB
C
/* Interrupt numbers and hardware vectors. */
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#ifndef _INTERRUPT_H
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#define _INTERRUPT_H
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#if (CHIP == INTEL)
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/* 8259A interrupt controller ports. */
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#define INT_CTL 0x20 /* I/O port for interrupt controller */
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#define INT_CTLMASK 0x21 /* setting bits in this port disables ints */
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#define INT2_CTL 0xA0 /* I/O port for second interrupt controller */
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#define INT2_CTLMASK 0xA1 /* setting bits in this port disables ints */
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/* Magic numbers for interrupt controller. */
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#define END_OF_INT 0x20 /* code used to re-enable after an interrupt */
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/* Interrupt vectors defined/reserved by processor. */
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#define DIVIDE_VECTOR 0 /* divide error */
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#define DEBUG_VECTOR 1 /* single step (trace) */
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#define NMI_VECTOR 2 /* non-maskable interrupt */
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#define BREAKPOINT_VECTOR 3 /* software breakpoint */
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#define OVERFLOW_VECTOR 4 /* from INTO */
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/* Fixed system call vector. */
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#define KERN_CALL_VECTOR 32 /* system calls are made with int SYSVEC */
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#define IPC_VECTOR 33 /* interrupt vector for ipc */
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/* Suitable irq bases for hardware interrupts. Reprogram the 8259(s) from
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* the PC BIOS defaults since the BIOS doesn't respect all the processor's
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* reserved vectors (0 to 31).
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*/
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#define BIOS_IRQ0_VEC 0x08 /* base of IRQ0-7 vectors used by BIOS */
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#define BIOS_IRQ8_VEC 0x70 /* base of IRQ8-15 vectors used by BIOS */
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#define IRQ0_VECTOR 0x50 /* nice vectors to relocate IRQ0-7 to */
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#define IRQ8_VECTOR 0x70 /* no need to move IRQ8-15 */
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/* Hardware interrupt numbers. */
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#ifndef USE_APIC
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#define NR_IRQ_VECTORS 16
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#else
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#define NR_IRQ_VECTORS 64
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#endif
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#define CLOCK_IRQ 0
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#define KEYBOARD_IRQ 1
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#define CASCADE_IRQ 2 /* cascade enable for 2nd AT controller */
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#define ETHER_IRQ 3 /* default ethernet interrupt vector */
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#define SECONDARY_IRQ 3 /* RS232 interrupt vector for port 2 */
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#define RS232_IRQ 4 /* RS232 interrupt vector for port 1 */
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#define XT_WINI_IRQ 5 /* xt winchester */
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#define FLOPPY_IRQ 6 /* floppy disk */
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#define PRINTER_IRQ 7
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#define SPURIOUS_IRQ 7
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#define CMOS_CLOCK_IRQ 8
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#define KBD_AUX_IRQ 12 /* AUX (PS/2 mouse) port in kbd controller */
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#define AT_WINI_0_IRQ 14 /* at winchester controller 0 */
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#define AT_WINI_1_IRQ 15 /* at winchester controller 1 */
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/* Interrupt number to hardware vector. */
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#define BIOS_VECTOR(irq) \
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(((irq) < 8 ? BIOS_IRQ0_VEC : BIOS_IRQ8_VEC) + ((irq) & 0x07))
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#define VECTOR(irq) \
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(((irq) < 8 ? IRQ0_VECTOR : IRQ8_VECTOR) + ((irq) & 0x07))
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#endif /* (CHIP == INTEL) */
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#endif /* _INTERRUPT_H */
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