471 lines
12 KiB
ArmAsm
471 lines
12 KiB
ArmAsm
/*
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* from: vector.s, 386BSD 0.1 unknown origin
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* $Id: apic_vector.s,v 1.18 1997/07/30 22:46:49 smp Exp smp $
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*/
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#include <machine/smp.h>
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#include <machine/smptests.h> /** PEND_INTS, various counters */
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#include "i386/isa/intr_machdep.h"
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/* convert an absolute IRQ# into a bitmask */
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#define IRQ_BIT(irq_num) (1 << (irq_num))
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/* make an index into the IO APIC from the IRQ# */
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#define REDTBL_IDX(irq_num) (0x10 + ((irq_num) * 2))
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/*
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* 'lazy masking' code suggested by Bruce Evans <bde@zeta.org.au>
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*/
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#ifdef PEND_INTS
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/*
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* the 1st version fails because masked edge-triggered INTs are lost
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* by the IO APIC. This version tests to see whether we are handling
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* an edge or level triggered INT. Level-triggered INTs must still be
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* masked as we don't clear the source, and the EOI cycle would allow
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* recursive INTs to occur.
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*/
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#define MAYBE_MASK_IRQ(irq_num) \
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lock ; /* MP-safe */ \
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btsl $(irq_num),iactive ; /* lazy masking */ \
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jc 6f ; /* already active */ \
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TRY_ISRLOCK(irq_num) ; /* try to get lock */ \
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testl %eax, %eax ; /* did we get it? */ \
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jnz 8f ; /* yes, enter kernel */ \
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6: ; /* active or locked */ \
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IMASK_LOCK ; /* into critical reg */ \
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testl $IRQ_BIT(irq_num),_apic_pin_trigger ; \
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jz 7f ; /* edge, don't mask */ \
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orl $IRQ_BIT(irq_num),_apic_imen ; /* set the mask bit */ \
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movl _ioapic,%ecx ; /* ioapic[0] addr */ \
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movl $REDTBL_IDX(irq_num),(%ecx) ; /* write the index */ \
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movl IOAPIC_WINDOW(%ecx),%eax ; /* current value */ \
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orl $IOART_INTMASK,%eax ; /* set the mask */ \
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movl %eax,IOAPIC_WINDOW(%ecx) ; /* new value */ \
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7: ; \
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orl $IRQ_BIT(irq_num), _ipending ; /* set _ipending bit */ \
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IMASK_UNLOCK ; /* exit critical reg */ \
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movl $0, lapic_eoi ; /* do the EOI */ \
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popl %es ; \
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popl %ds ; \
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popal ; \
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addl $4+4,%esp ; \
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iret ; \
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; \
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ALIGN_TEXT ; \
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8:
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#else /* PEND_INTS */
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#define MAYBE_MASK_IRQ(irq_num) \
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lock ; /* MP-safe */ \
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btsl $(irq_num),iactive ; /* lazy masking */ \
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jnc 1f ; /* NOT active */ \
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IMASK_LOCK ; /* enter critical reg */\
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orl $IRQ_BIT(irq_num),_apic_imen ; /* set the mask bit */ \
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movl _ioapic,%ecx ; /* ioapic[0]addr */ \
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movl $REDTBL_IDX(irq_num),(%ecx) ; /* write the index */ \
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movl IOAPIC_WINDOW(%ecx),%eax ; /* current value */ \
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orl $IOART_INTMASK,%eax ; /* set the mask */ \
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movl %eax,IOAPIC_WINDOW(%ecx) ; /* new value */ \
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orl $IRQ_BIT(irq_num), _ipending ; /* set _ipending bit */ \
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movl $0, lapic_eoi ; /* do the EOI */ \
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IMASK_UNLOCK ; /* exit critical reg */ \
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popl %es ; \
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popl %ds ; \
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popal ; \
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addl $4+4,%esp ; \
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iret ; \
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; \
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ALIGN_TEXT ; \
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1: ; \
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GET_MPLOCK /* SMP Spin lock */
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#endif /* PEND_INTS */
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#define MAYBE_UNMASK_IRQ(irq_num) \
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cli ; /* must unmask _apic_imen and IO APIC atomically */ \
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lock ; /* MP-safe */ \
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andl $~IRQ_BIT(irq_num),iactive ; \
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IMASK_LOCK ; /* enter critical reg */\
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testl $IRQ_BIT(irq_num),_apic_imen ; \
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je 9f ; \
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andl $~IRQ_BIT(irq_num),_apic_imen ; /* clear mask bit */ \
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movl _ioapic,%ecx ; /* ioapic[0]addr */ \
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movl $REDTBL_IDX(irq_num),(%ecx) ; /* write the index */ \
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movl IOAPIC_WINDOW(%ecx),%eax ; /* current value */ \
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andl $~IOART_INTMASK,%eax ; /* clear the mask */ \
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movl %eax,IOAPIC_WINDOW(%ecx) ; /* new value */ \
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9: ; \
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IMASK_UNLOCK ; /* exit critical reg */ \
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sti /* XXX _doreti repeats the cli/sti */
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/*
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* Macros for interrupt interrupt entry, call to handler, and exit.
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*/
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#define FAST_INTR(irq_num, vec_name) \
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.text ; \
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SUPERALIGN_TEXT ; \
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IDTVEC(vec_name) ; \
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pushl %eax ; /* save only call-used registers */ \
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pushl %ecx ; \
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pushl %edx ; \
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pushl %ds ; \
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MAYBE_PUSHL_ES ; \
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movl $KDSEL,%eax ; \
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movl %ax,%ds ; \
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MAYBE_MOVW_AX_ES ; \
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FAKE_MCOUNT((4+ACTUALLY_PUSHED)*4(%esp)) ; \
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GET_ISRLOCK(irq_num) ; \
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pushl _intr_unit + (irq_num) * 4 ; \
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call *_intr_handler + (irq_num) * 4 ; /* do the work ASAP */ \
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movl $0, lapic_eoi ; \
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addl $4,%esp ; \
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incl _cnt+V_INTR ; /* book-keeping can wait */ \
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movl _intr_countp + (irq_num) * 4,%eax ; \
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incl (%eax) ; \
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movl _cpl,%eax ; /* unmasking pending HWIs or SWIs? */ \
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notl %eax ; \
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andl _ipending,%eax ; \
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jne 2f ; /* yes, maybe handle them */ \
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1: ; \
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MEXITCOUNT ; \
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REL_ISRLOCK(irq_num) ; \
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MAYBE_POPL_ES ; \
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popl %ds ; \
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popl %edx ; \
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popl %ecx ; \
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popl %eax ; \
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iret ; \
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; \
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ALIGN_TEXT ; \
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2: ; \
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cmpb $3,_intr_nesting_level ; /* enough stack? */ \
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jae 1b ; /* no, return */ \
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movl _cpl,%eax ; \
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/* XXX next line is probably unnecessary now. */ \
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movl $HWI_MASK|SWI_MASK,_cpl ; /* limit nesting ... */ \
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incb _intr_nesting_level ; /* ... really limit it ... */ \
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sti ; /* to do this as early as possible */ \
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MAYBE_POPL_ES ; /* discard most of thin frame ... */ \
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popl %ecx ; /* ... original %ds ... */ \
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popl %edx ; \
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xchgl %eax,4(%esp) ; /* orig %eax; save cpl */ \
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pushal ; /* build fat frame (grrr) ... */ \
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pushl %ecx ; /* ... actually %ds ... */ \
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pushl %es ; \
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movl $KDSEL,%eax ; \
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movl %ax,%es ; \
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movl (2+8+0)*4(%esp),%ecx ; /* %ecx from thin frame ... */ \
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movl %ecx,(2+6)*4(%esp) ; /* ... to fat frame ... */ \
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movl (2+8+1)*4(%esp),%eax ; /* ... cpl from thin frame */ \
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pushl %eax ; \
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subl $4,%esp ; /* junk for unit number */ \
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MEXITCOUNT ; \
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jmp _doreti
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#define INTR(irq_num, vec_name) \
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.text ; \
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SUPERALIGN_TEXT ; \
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IDTVEC(vec_name) ; \
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pushl $0 ; /* dummy error code */ \
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pushl $0 ; /* dummy trap type */ \
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pushal ; \
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pushl %ds ; /* save data and extra segments ... */ \
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pushl %es ; \
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movl $KDSEL,%eax ; /* ... and reload with kernel's ... */ \
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movl %ax,%ds ; /* ... early for obsolete reasons */ \
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movl %ax,%es ; \
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MAYBE_MASK_IRQ(irq_num) ; \
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movl $0, lapic_eoi ; \
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movl _cpl,%eax ; \
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testl $IRQ_BIT(irq_num), %eax ; \
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jne 3f ; \
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incb _intr_nesting_level ; \
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__CONCAT(Xresume,irq_num): ; \
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FAKE_MCOUNT(12*4(%esp)) ; /* XXX late to avoid dbl cnt */ \
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incl _cnt+V_INTR ; /* tally interrupts */ \
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movl _intr_countp + (irq_num) * 4,%eax ; \
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incl (%eax) ; \
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movl _cpl,%eax ; \
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pushl %eax ; \
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pushl _intr_unit + (irq_num) * 4 ; \
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orl _intr_mask + (irq_num) * 4,%eax ; \
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movl %eax,_cpl ; \
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sti ; \
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call *_intr_handler + (irq_num) * 4 ; \
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MAYBE_UNMASK_IRQ(irq_num) ; \
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MEXITCOUNT ; \
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jmp _doreti ; \
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; \
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ALIGN_TEXT ; \
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3: ; \
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/* XXX skip mcounting here to avoid double count */ \
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orl $IRQ_BIT(irq_num), _ipending ; \
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REL_ISRLOCK(irq_num) ; \
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popl %es ; \
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popl %ds ; \
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popal ; \
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addl $4+4,%esp ; \
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iret
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/*
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* Handle "spurious INTerrupts".
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* Notes:
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* This is different than the "spurious INTerrupt" generated by an
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* 8259 PIC for missing INTs. See the APIC documentation for details.
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* This routine should NOT do an 'EOI' cycle.
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*/
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.text
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SUPERALIGN_TEXT
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.globl _Xspuriousint
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_Xspuriousint:
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#ifdef COUNT_SPURIOUS_INTS
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ss
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incl _sihits
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#endif
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/* No EOI cycle used here */
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iret
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/*
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* Handle TLB shootdowns.
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*/
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.text
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SUPERALIGN_TEXT
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.globl _Xinvltlb
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_Xinvltlb:
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pushl %eax
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#ifdef COUNT_XINVLTLB_HITS
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ss
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movl _cpuid, %eax
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ss
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incl _xhits(,%eax,4)
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#endif /* COUNT_XINVLTLB_HITS */
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movl %cr3, %eax /* invalidate the TLB */
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movl %eax, %cr3
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ss /* stack segment, avoid %ds load */
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movl $0, lapic_eoi /* End Of Interrupt to APIC */
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popl %eax
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iret
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/*
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* Executed by a CPU when it receives an Xcpustop IPI from another CPU,
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*
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* - Signals its receipt.
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* - Waits for permission to restart.
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* - Signals its restart.
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*/
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.text
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SUPERALIGN_TEXT
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.globl _Xcpustop
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_Xcpustop:
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pushl %eax
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pushl %ds /* save current data segment */
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movl $KDSEL, %eax
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movl %ax, %ds /* use KERNEL data segment */
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movl _cpuid, %eax
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#ifdef COUNT_CSHITS
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incl _cshits(,%eax,4)
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#endif /* COUNT_CSHITS */
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ASMPOSTCODE_HI(0x1)
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lock
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btsl %eax, _stopped_cpus /* stopped_cpus |= (1<<id) */
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ASMPOSTCODE_HI(0x2);
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1:
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btl %eax, _started_cpus /* while (!(started_cpus & (1<<id))) */
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jnc 1b
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ASMPOSTCODE_HI(0x3)
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lock
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btrl %eax, _started_cpus /* started_cpus &= ~(1<<id) */
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ASMPOSTCODE_HI(0x4)
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movl $0, lapic_eoi /* End Of Interrupt to APIC */
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popl %ds /* restore previous data segment */
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popl %eax
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iret
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MCOUNT_LABEL(bintr)
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FAST_INTR(0,fastintr0)
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FAST_INTR(1,fastintr1)
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FAST_INTR(2,fastintr2)
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FAST_INTR(3,fastintr3)
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FAST_INTR(4,fastintr4)
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FAST_INTR(5,fastintr5)
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FAST_INTR(6,fastintr6)
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FAST_INTR(7,fastintr7)
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FAST_INTR(8,fastintr8)
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FAST_INTR(9,fastintr9)
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FAST_INTR(10,fastintr10)
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FAST_INTR(11,fastintr11)
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FAST_INTR(12,fastintr12)
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FAST_INTR(13,fastintr13)
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FAST_INTR(14,fastintr14)
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FAST_INTR(15,fastintr15)
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FAST_INTR(16,fastintr16)
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FAST_INTR(17,fastintr17)
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FAST_INTR(18,fastintr18)
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FAST_INTR(19,fastintr19)
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FAST_INTR(20,fastintr20)
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FAST_INTR(21,fastintr21)
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FAST_INTR(22,fastintr22)
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FAST_INTR(23,fastintr23)
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INTR(0,intr0)
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INTR(1,intr1)
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INTR(2,intr2)
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INTR(3,intr3)
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INTR(4,intr4)
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INTR(5,intr5)
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INTR(6,intr6)
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INTR(7,intr7)
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INTR(8,intr8)
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INTR(9,intr9)
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INTR(10,intr10)
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INTR(11,intr11)
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INTR(12,intr12)
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INTR(13,intr13)
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INTR(14,intr14)
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INTR(15,intr15)
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INTR(16,intr16)
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INTR(17,intr17)
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INTR(18,intr18)
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INTR(19,intr19)
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INTR(20,intr20)
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INTR(21,intr21)
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INTR(22,intr22)
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INTR(23,intr23)
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MCOUNT_LABEL(eintr)
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.data
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ihandlers: /* addresses of interrupt handlers */
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/* actually resumption addresses for HWI's */
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.long Xresume0, Xresume1, Xresume2, Xresume3
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.long Xresume4, Xresume5, Xresume6, Xresume7
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.long Xresume8, Xresume9, Xresume10, Xresume11
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.long Xresume12, Xresume13, Xresume14, Xresume15
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.long Xresume16, Xresume17, Xresume18, Xresume19
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.long Xresume20, Xresume21, Xresume22, Xresume23
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.long swi_tty, swi_net
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.long 0, 0, 0, 0
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.long _softclock, swi_ast
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imasks: /* masks for interrupt handlers */
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.space NHWI*4 /* padding; HWI masks are elsewhere */
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.long SWI_TTY_MASK, SWI_NET_MASK
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.long 0, 0, 0, 0
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.long SWI_CLOCK_MASK, SWI_AST_MASK
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.globl _ivectors
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_ivectors:
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.long _Xintr0, _Xintr1, _Xintr2, _Xintr3
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.long _Xintr4, _Xintr5, _Xintr6, _Xintr7
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.long _Xintr8, _Xintr9, _Xintr10, _Xintr11
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.long _Xintr12, _Xintr13, _Xintr14, _Xintr15
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.long _Xintr16, _Xintr17, _Xintr18, _Xintr19
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.long _Xintr20, _Xintr21, _Xintr22, _Xintr23
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/* active flag for lazy masking */
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iactive:
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.long 0
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#ifdef COUNT_SPURIOUS_INTS
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.globl _sihits
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_sihits:
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.long 0
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#endif /* COUNT_SPURIOUS_INTS */
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#ifdef COUNT_XINVLTLB_HITS
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.globl _xhits
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_xhits:
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.space (NCPU * 4), 0
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#endif /* COUNT_XINVLTLB_HITS */
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/* variables used by stop_cpus()/restart_cpus()/Xcpustop */
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.globl _stopped_cpus, _started_cpus
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_stopped_cpus:
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.long 0
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_started_cpus:
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.long 0
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#ifdef COUNT_CSHITS
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.globl _cshits
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_cshits:
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.space (NCPU * 4), 0
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#endif /* COUNT_CSHITS */
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#ifdef PEND_INTS
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.globl _apic_pin_trigger
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_apic_pin_trigger:
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.space (NAPIC * 4), 0
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#endif /* PEND_INTS */
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/*
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* Interrupt counters and names. The format of these and the label names
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* must agree with what vmstat expects. The tables are indexed by device
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* ids so that we don't have to move the names around as devices are
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* attached.
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*/
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#include "vector.h"
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.globl _intrcnt, _eintrcnt
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_intrcnt:
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.space (NR_DEVICES + ICU_LEN) * 4
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_eintrcnt:
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.globl _intrnames, _eintrnames
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_intrnames:
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.ascii DEVICE_NAMES
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.asciz "stray irq0"
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.asciz "stray irq1"
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.asciz "stray irq2"
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.asciz "stray irq3"
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.asciz "stray irq4"
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.asciz "stray irq5"
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.asciz "stray irq6"
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.asciz "stray irq7"
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.asciz "stray irq8"
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.asciz "stray irq9"
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.asciz "stray irq10"
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.asciz "stray irq11"
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.asciz "stray irq12"
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.asciz "stray irq13"
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.asciz "stray irq14"
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.asciz "stray irq15"
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.asciz "stray irq16"
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.asciz "stray irq17"
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.asciz "stray irq18"
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.asciz "stray irq19"
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.asciz "stray irq20"
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.asciz "stray irq21"
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.asciz "stray irq22"
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.asciz "stray irq23"
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_eintrnames:
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.text
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