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freebsd-dev/sys/i386/isa/apic_vector.s
Tor Egge 2f1e70693d Add forwarding of roundrobin to other cpus. This gives a more regular 
update of cpu usage as shown by top when one process is cpu bound
(no system calls) while the system is otherwise idle (except for top).

Don't attempt to switch to the BSP in boot().  If the system was idle when
an interrupt caused a panic, this won't work.  Instead, switch to the BSP
in cpu_reset.

Remove some spurious forward_statclock/forward_hardclock warnings.
1998-05-17 22:12:14 +00:00

1053 lines
25 KiB
ArmAsm
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/*
* from: vector.s, 386BSD 0.1 unknown origin
* $Id: apic_vector.s,v 1.29 1998/04/22 22:49:27 tegge Exp $
*/
#include <machine/apic.h>
#include <machine/smp.h>
#include "i386/isa/intr_machdep.h"
#ifdef FAST_SIMPLELOCK
#define GET_FAST_INTR_LOCK \
pushl $_fast_intr_lock ; /* address of lock */ \
call _s_lock ; /* MP-safe */ \
addl $4,%esp
#define REL_FAST_INTR_LOCK \
pushl $_fast_intr_lock ; /* address of lock */ \
call _s_unlock ; /* MP-safe */ \
addl $4,%esp
#else /* FAST_SIMPLELOCK */
#define GET_FAST_INTR_LOCK \
call _get_isrlock
#define REL_FAST_INTR_LOCK \
pushl $_mp_lock ; /* GIANT_LOCK */ \
call _MPrellock ; \
add $4, %esp
#endif /* FAST_SIMPLELOCK */
/* convert an absolute IRQ# into a bitmask */
#define IRQ_BIT(irq_num) (1 << (irq_num))
/* make an index into the IO APIC from the IRQ# */
#define REDTBL_IDX(irq_num) (0x10 + ((irq_num) * 2))
/*
* Macros for interrupt interrupt entry, call to handler, and exit.
*/
#ifdef FAST_WITHOUTCPL
/*
*/
#define FAST_INTR(irq_num, vec_name) \
.text ; \
SUPERALIGN_TEXT ; \
IDTVEC(vec_name) ; \
pushl %eax ; /* save only call-used registers */ \
pushl %ecx ; \
pushl %edx ; \
pushl %ds ; \
MAYBE_PUSHL_ES ; \
movl $KDSEL,%eax ; \
movl %ax,%ds ; \
MAYBE_MOVW_AX_ES ; \
FAKE_MCOUNT((4+ACTUALLY_PUSHED)*4(%esp)) ; \
pushl _intr_unit + (irq_num) * 4 ; \
GET_FAST_INTR_LOCK ; \
call *_intr_handler + (irq_num) * 4 ; /* do the work ASAP */ \
REL_FAST_INTR_LOCK ; \
addl $4, %esp ; \
movl $0, lapic_eoi ; \
lock ; \
incl _cnt+V_INTR ; /* book-keeping can wait */ \
movl _intr_countp + (irq_num) * 4, %eax ; \
lock ; \
incl (%eax) ; \
MEXITCOUNT ; \
MAYBE_POPL_ES ; \
popl %ds ; \
popl %edx ; \
popl %ecx ; \
popl %eax ; \
iret
#else /* FAST_WITHOUTCPL */
#define FAST_INTR(irq_num, vec_name) \
.text ; \
SUPERALIGN_TEXT ; \
IDTVEC(vec_name) ; \
pushl %eax ; /* save only call-used registers */ \
pushl %ecx ; \
pushl %edx ; \
pushl %ds ; \
MAYBE_PUSHL_ES ; \
movl $KDSEL, %eax ; \
movl %ax, %ds ; \
MAYBE_MOVW_AX_ES ; \
FAKE_MCOUNT((4+ACTUALLY_PUSHED)*4(%esp)) ; \
GET_FAST_INTR_LOCK ; \
pushl _intr_unit + (irq_num) * 4 ; \
call *_intr_handler + (irq_num) * 4 ; /* do the work ASAP */ \
addl $4, %esp ; \
movl $0, lapic_eoi ; \
lock ; \
incl _cnt+V_INTR ; /* book-keeping can wait */ \
movl _intr_countp + (irq_num) * 4,%eax ; \
lock ; \
incl (%eax) ; \
movl _cpl, %eax ; /* unmasking pending HWIs or SWIs? */ \
notl %eax ; \
andl _ipending, %eax ; \
jne 2f ; /* yes, maybe handle them */ \
1: ; \
MEXITCOUNT ; \
REL_FAST_INTR_LOCK ; \
MAYBE_POPL_ES ; \
popl %ds ; \
popl %edx ; \
popl %ecx ; \
popl %eax ; \
iret ; \
; \
ALIGN_TEXT ; \
2: ; \
cmpb $3, _intr_nesting_level ; /* enough stack? */ \
jae 1b ; /* no, return */ \
movl _cpl, %eax ; \
/* XXX next line is probably unnecessary now. */ \
movl $HWI_MASK|SWI_MASK, _cpl ; /* limit nesting ... */ \
lock ; \
incb _intr_nesting_level ; /* ... really limit it ... */ \
sti ; /* to do this as early as possible */ \
MAYBE_POPL_ES ; /* discard most of thin frame ... */ \
popl %ecx ; /* ... original %ds ... */ \
popl %edx ; \
xchgl %eax, 4(%esp) ; /* orig %eax; save cpl */ \
pushal ; /* build fat frame (grrr) ... */ \
pushl %ecx ; /* ... actually %ds ... */ \
pushl %es ; \
movl $KDSEL, %eax ; \
movl %ax, %es ; \
movl (2+8+0)*4(%esp), %ecx ; /* %ecx from thin frame ... */ \
movl %ecx, (2+6)*4(%esp) ; /* ... to fat frame ... */ \
movl (2+8+1)*4(%esp), %eax ; /* ... cpl from thin frame */ \
pushl %eax ; \
subl $4, %esp ; /* junk for unit number */ \
MEXITCOUNT ; \
jmp _doreti
#endif /** FAST_WITHOUTCPL */
/*
*
*/
#define PUSH_FRAME \
pushl $0 ; /* dummy error code */ \
pushl $0 ; /* dummy trap type */ \
pushal ; \
pushl %ds ; /* save data and extra segments ... */ \
pushl %es
#define POP_FRAME \
popl %es ; \
popl %ds ; \
popal ; \
addl $4+4,%esp
#define MASK_IRQ(irq_num) \
IMASK_LOCK ; /* into critical reg */ \
testl $IRQ_BIT(irq_num), _apic_imen ; \
jne 7f ; /* masked, don't mask */ \
orl $IRQ_BIT(irq_num), _apic_imen ; /* set the mask bit */ \
movl _ioapic, %ecx ; /* ioapic[0] addr */ \
movl $REDTBL_IDX(irq_num), (%ecx) ; /* write the index */ \
movl IOAPIC_WINDOW(%ecx), %eax ; /* current value */ \
orl $IOART_INTMASK, %eax ; /* set the mask */ \
movl %eax, IOAPIC_WINDOW(%ecx) ; /* new value */ \
7: ; /* already masked */ \
IMASK_UNLOCK
/*
* Test to see whether we are handling an edge or level triggered INT.
* Level-triggered INTs must still be masked as we don't clear the source,
* and the EOI cycle would cause redundant INTs to occur.
*/
#define MASK_LEVEL_IRQ(irq_num) \
testl $IRQ_BIT(irq_num), _apic_pin_trigger ; \
jz 9f ; /* edge, don't mask */ \
MASK_IRQ(irq_num) ; \
9:
#ifdef APIC_INTR_REORDER
#define EOI_IRQ(irq_num) \
movl _apic_isrbit_location + 8 * (irq_num), %eax ; \
movl (%eax), %eax ; \
testl _apic_isrbit_location + 4 + 8 * (irq_num), %eax ; \
jz 9f ; /* not active */ \
movl $0, lapic_eoi ; \
APIC_ITRACE(apic_itrace_eoi, irq_num, APIC_ITRACE_EOI) ; \
9:
#else
#define EOI_IRQ(irq_num) \
testl $IRQ_BIT(irq_num), lapic_isr1; \
jz 9f ; /* not active */ \
movl $0, lapic_eoi; \
APIC_ITRACE(apic_itrace_eoi, irq_num, APIC_ITRACE_EOI) ; \
9:
#endif
/*
* Test to see if the source is currntly masked, clear if so.
*/
#define UNMASK_IRQ(irq_num) \
IMASK_LOCK ; /* into critical reg */ \
testl $IRQ_BIT(irq_num), _apic_imen ; \
je 7f ; /* bit clear, not masked */ \
andl $~IRQ_BIT(irq_num), _apic_imen ;/* clear mask bit */ \
movl _ioapic,%ecx ; /* ioapic[0]addr */ \
movl $REDTBL_IDX(irq_num),(%ecx) ; /* write the index */ \
movl IOAPIC_WINDOW(%ecx),%eax ; /* current value */ \
andl $~IOART_INTMASK,%eax ; /* clear the mask */ \
movl %eax,IOAPIC_WINDOW(%ecx) ; /* new value */ \
7: ; \
IMASK_UNLOCK
#ifdef INTR_SIMPLELOCK
#define ENLOCK
#define DELOCK
#define LATELOCK call _get_isrlock
#else
#define ENLOCK \
ISR_TRYLOCK ; /* XXX this is going away... */ \
testl %eax, %eax ; /* did we get it? */ \
jz 3f
#define DELOCK ISR_RELLOCK
#define LATELOCK
#endif
#ifdef APIC_INTR_DIAGNOSTIC
#ifdef APIC_INTR_DIAGNOSTIC_IRQ
log_intr_event:
pushf
cli
pushl $CNAME(apic_itrace_debuglock)
call _s_lock_np
addl $4, %esp
movl CNAME(apic_itrace_debugbuffer_idx), %ecx
andl $32767, %ecx
movl _cpuid, %eax
shll $8, %eax
orl 8(%esp), %eax
movw %ax, CNAME(apic_itrace_debugbuffer)(,%ecx,2)
incl %ecx
andl $32767, %ecx
movl %ecx, CNAME(apic_itrace_debugbuffer_idx)
pushl $CNAME(apic_itrace_debuglock)
call _s_unlock_np
addl $4, %esp
popf
ret
#define APIC_ITRACE(name, irq_num, id) \
lock ; /* MP-safe */ \
incl CNAME(name) + (irq_num) * 4 ; \
pushl %eax ; \
pushl %ecx ; \
pushl %edx ; \
movl $(irq_num), %eax ; \
cmpl $APIC_INTR_DIAGNOSTIC_IRQ, %eax ; \
jne 7f ; \
pushl $id ; \
call log_intr_event ; \
addl $4, %esp ; \
7: ; \
popl %edx ; \
popl %ecx ; \
popl %eax
#else
#define APIC_ITRACE(name, irq_num, id) \
lock ; /* MP-safe */ \
incl CNAME(name) + (irq_num) * 4
#endif
#define APIC_ITRACE_ENTER 1
#define APIC_ITRACE_EOI 2
#define APIC_ITRACE_TRYISRLOCK 3
#define APIC_ITRACE_GOTISRLOCK 4
#define APIC_ITRACE_ENTER2 5
#define APIC_ITRACE_LEAVE 6
#define APIC_ITRACE_UNMASK 7
#define APIC_ITRACE_ACTIVE 8
#define APIC_ITRACE_MASKED 9
#define APIC_ITRACE_NOISRLOCK 10
#define APIC_ITRACE_MASKED2 11
#define APIC_ITRACE_SPLZ 12
#define APIC_ITRACE_DORETI 13
#else
#define APIC_ITRACE(name, irq_num, id)
#endif
#ifdef CPL_AND_CML
#define INTR(irq_num, vec_name) \
.text ; \
SUPERALIGN_TEXT ; \
/* _XintrNN: entry point used by IDT/HWIs & splz_unpend via _vec[]. */ \
IDTVEC(vec_name) ; \
PUSH_FRAME ; \
movl $KDSEL, %eax ; /* reload with kernel's data segment */ \
movl %ax, %ds ; \
movl %ax, %es ; \
; \
APIC_ITRACE(apic_itrace_enter, irq_num, APIC_ITRACE_ENTER) ; \
lock ; /* MP-safe */ \
btsl $(irq_num), iactive ; /* lazy masking */ \
jc 1f ; /* already active */ \
; \
MASK_LEVEL_IRQ(irq_num) ; \
EOI_IRQ(irq_num) ; \
0: ; \
APIC_ITRACE(apic_itrace_tryisrlock, irq_num, APIC_ITRACE_TRYISRLOCK) ;\
ENLOCK ; \
; \
APIC_ITRACE(apic_itrace_gotisrlock, irq_num, APIC_ITRACE_GOTISRLOCK) ;\
AVCPL_LOCK ; /* MP-safe */ \
testl $IRQ_BIT(irq_num), _cpl ; \
jne 2f ; /* this INT masked */ \
testl $IRQ_BIT(irq_num), _cml ; \
jne 2f ; /* this INT masked */ \
orl $IRQ_BIT(irq_num), _cil ; \
AVCPL_UNLOCK ; \
; \
incb _intr_nesting_level ; \
; \
/* entry point used by doreti_unpend for HWIs. */ \
__CONCAT(Xresume,irq_num): ; \
FAKE_MCOUNT(12*4(%esp)) ; /* XXX avoid dbl cnt */ \
lock ; incl _cnt+V_INTR ; /* tally interrupts */ \
movl _intr_countp + (irq_num) * 4, %eax ; \
lock ; incl (%eax) ; \
; \
AVCPL_LOCK ; /* MP-safe */ \
movl _cml, %eax ; \
pushl %eax ; \
orl _intr_mask + (irq_num) * 4, %eax ; \
movl %eax, _cml ; \
AVCPL_UNLOCK ; \
; \
pushl _intr_unit + (irq_num) * 4 ; \
incl _inside_intr ; \
APIC_ITRACE(apic_itrace_enter2, irq_num, APIC_ITRACE_ENTER2) ; \
sti ; \
call *_intr_handler + (irq_num) * 4 ; \
cli ; \
APIC_ITRACE(apic_itrace_leave, irq_num, APIC_ITRACE_LEAVE) ; \
decl _inside_intr ; \
; \
lock ; andl $~IRQ_BIT(irq_num), iactive ; \
lock ; andl $~IRQ_BIT(irq_num), _cil ; \
UNMASK_IRQ(irq_num) ; \
APIC_ITRACE(apic_itrace_unmask, irq_num, APIC_ITRACE_UNMASK) ; \
sti ; /* doreti repeats cli/sti */ \
MEXITCOUNT ; \
LATELOCK ; \
jmp _doreti ; \
; \
ALIGN_TEXT ; \
1: ; /* active */ \
APIC_ITRACE(apic_itrace_active, irq_num, APIC_ITRACE_ACTIVE) ; \
MASK_IRQ(irq_num) ; \
EOI_IRQ(irq_num) ; \
AVCPL_LOCK ; /* MP-safe */ \
orl $IRQ_BIT(irq_num), _ipending ; \
AVCPL_UNLOCK ; \
lock ; \
btsl $(irq_num), iactive ; /* still active */ \
jnc 0b ; /* retry */ \
POP_FRAME ; \
iret ; \
; \
ALIGN_TEXT ; \
2: ; /* masked by cpl|cml */ \
APIC_ITRACE(apic_itrace_masked, irq_num, APIC_ITRACE_MASKED) ; \
orl $IRQ_BIT(irq_num), _ipending ; \
AVCPL_UNLOCK ; \
DELOCK ; /* XXX this is going away... */ \
POP_FRAME ; \
iret ; \
ALIGN_TEXT ; \
3: ; /* other cpu has isr lock */ \
APIC_ITRACE(apic_itrace_noisrlock, irq_num, APIC_ITRACE_NOISRLOCK) ;\
AVCPL_LOCK ; /* MP-safe */ \
orl $IRQ_BIT(irq_num), _ipending ; \
testl $IRQ_BIT(irq_num), _cpl ; \
jne 4f ; /* this INT masked */ \
testl $IRQ_BIT(irq_num), _cml ; \
jne 4f ; /* this INT masked */ \
orl $IRQ_BIT(irq_num), _cil ; \
AVCPL_UNLOCK ; \
call forward_irq ; /* forward irq to lock holder */ \
POP_FRAME ; /* and return */ \
iret ; \
ALIGN_TEXT ; \
4: ; /* blocked */ \
APIC_ITRACE(apic_itrace_masked2, irq_num, APIC_ITRACE_MASKED2) ;\
AVCPL_UNLOCK ; \
POP_FRAME ; /* and return */ \
iret
#else /* CPL_AND_CML */
#define INTR(irq_num, vec_name) \
.text ; \
SUPERALIGN_TEXT ; \
/* _XintrNN: entry point used by IDT/HWIs & splz_unpend via _vec[]. */ \
IDTVEC(vec_name) ; \
PUSH_FRAME ; \
movl $KDSEL, %eax ; /* reload with kernel's data segment */ \
movl %ax, %ds ; \
movl %ax, %es ; \
; \
APIC_ITRACE(apic_itrace_enter, irq_num, APIC_ITRACE_ENTER) ; \
lock ; /* MP-safe */ \
btsl $(irq_num), iactive ; /* lazy masking */ \
jc 1f ; /* already active */ \
; \
MASK_LEVEL_IRQ(irq_num) ; \
EOI_IRQ(irq_num) ; \
0: ; \
APIC_ITRACE(apic_itrace_tryisrlock, irq_num, APIC_ITRACE_TRYISRLOCK) ;\
ISR_TRYLOCK ; /* XXX this is going away... */ \
testl %eax, %eax ; /* did we get it? */ \
jz 3f ; /* no */ \
; \
APIC_ITRACE(apic_itrace_gotisrlock, irq_num, APIC_ITRACE_GOTISRLOCK) ;\
AVCPL_LOCK ; /* MP-safe */ \
testl $IRQ_BIT(irq_num), _cpl ; \
jne 2f ; /* this INT masked */ \
AVCPL_UNLOCK ; \
; \
incb _intr_nesting_level ; \
; \
/* entry point used by doreti_unpend for HWIs. */ \
__CONCAT(Xresume,irq_num): ; \
FAKE_MCOUNT(12*4(%esp)) ; /* XXX avoid dbl cnt */ \
lock ; incl _cnt+V_INTR ; /* tally interrupts */ \
movl _intr_countp + (irq_num) * 4, %eax ; \
lock ; incl (%eax) ; \
; \
AVCPL_LOCK ; /* MP-safe */ \
movl _cpl, %eax ; \
pushl %eax ; \
orl _intr_mask + (irq_num) * 4, %eax ; \
movl %eax, _cpl ; \
andl $~IRQ_BIT(irq_num), _ipending ; \
AVCPL_UNLOCK ; \
; \
pushl _intr_unit + (irq_num) * 4 ; \
APIC_ITRACE(apic_itrace_enter2, irq_num, APIC_ITRACE_ENTER2) ; \
sti ; \
call *_intr_handler + (irq_num) * 4 ; \
cli ; \
APIC_ITRACE(apic_itrace_leave, irq_num, APIC_ITRACE_LEAVE) ; \
; \
lock ; andl $~IRQ_BIT(irq_num), iactive ; \
UNMASK_IRQ(irq_num) ; \
APIC_ITRACE(apic_itrace_unmask, irq_num, APIC_ITRACE_UNMASK) ; \
sti ; /* doreti repeats cli/sti */ \
MEXITCOUNT ; \
jmp _doreti ; \
; \
ALIGN_TEXT ; \
1: ; /* active */ \
APIC_ITRACE(apic_itrace_active, irq_num, APIC_ITRACE_ACTIVE) ; \
MASK_IRQ(irq_num) ; \
EOI_IRQ(irq_num) ; \
AVCPL_LOCK ; /* MP-safe */ \
orl $IRQ_BIT(irq_num), _ipending ; \
AVCPL_UNLOCK ; \
lock ; \
btsl $(irq_num), iactive ; /* still active */ \
jnc 0b ; /* retry */ \
POP_FRAME ; \
iret ; /* XXX: iactive bit might be 0 now */ \
ALIGN_TEXT ; \
2: ; /* masked by cpl, leave iactive set */ \
APIC_ITRACE(apic_itrace_masked, irq_num, APIC_ITRACE_MASKED) ; \
orl $IRQ_BIT(irq_num), _ipending ; \
AVCPL_UNLOCK ; \
ISR_RELLOCK ; /* XXX this is going away... */ \
POP_FRAME ; \
iret ; \
ALIGN_TEXT ; \
3: ; /* other cpu has isr lock */ \
APIC_ITRACE(apic_itrace_noisrlock, irq_num, APIC_ITRACE_NOISRLOCK) ;\
AVCPL_LOCK ; /* MP-safe */ \
orl $IRQ_BIT(irq_num), _ipending ; \
testl $IRQ_BIT(irq_num), _cpl ; \
jne 4f ; /* this INT masked */ \
AVCPL_UNLOCK ; \
call forward_irq ; /* forward irq to lock holder */ \
POP_FRAME ; /* and return */ \
iret ; \
ALIGN_TEXT ; \
4: ; /* blocked */ \
APIC_ITRACE(apic_itrace_masked2, irq_num, APIC_ITRACE_MASKED2) ;\
AVCPL_UNLOCK ; \
POP_FRAME ; /* and return */ \
iret
#endif /* CPL_AND_CML */
/*
* Handle "spurious INTerrupts".
* Notes:
* This is different than the "spurious INTerrupt" generated by an
* 8259 PIC for missing INTs. See the APIC documentation for details.
* This routine should NOT do an 'EOI' cycle.
*/
.text
SUPERALIGN_TEXT
.globl _Xspuriousint
_Xspuriousint:
/* No EOI cycle used here */
iret
/*
* Handle TLB shootdowns.
*/
.text
SUPERALIGN_TEXT
.globl _Xinvltlb
_Xinvltlb:
pushl %eax
#ifdef COUNT_XINVLTLB_HITS
ss
movl _cpuid, %eax
ss
incl _xhits(,%eax,4)
#endif /* COUNT_XINVLTLB_HITS */
movl %cr3, %eax /* invalidate the TLB */
movl %eax, %cr3
ss /* stack segment, avoid %ds load */
movl $0, lapic_eoi /* End Of Interrupt to APIC */
popl %eax
iret
#ifdef BETTER_CLOCK
/*
* Executed by a CPU when it receives an Xcpucheckstate IPI from another CPU,
*
* - Stores current cpu state in checkstate_cpustate[cpuid]
* 0 == user, 1 == sys, 2 == intr
* - Stores current process in checkstate_curproc[cpuid]
*
* - Signals its receipt by setting bit cpuid in checkstate_probed_cpus.
*
* stack: 0 -> ds, 4 -> ebx, 8 -> eax, 12 -> eip, 16 -> cs, 20 -> eflags
*/
.text
SUPERALIGN_TEXT
.globl _Xcpucheckstate
.globl _checkstate_cpustate
.globl _checkstate_curproc
.globl _checkstate_pc
_Xcpucheckstate:
pushl %eax
pushl %ebx
pushl %ds /* save current data segment */
movl $KDSEL, %eax
movl %ax, %ds /* use KERNEL data segment */
movl $0, lapic_eoi /* End Of Interrupt to APIC */
movl $0, %ebx
movl 16(%esp), %eax
andl $3, %eax
cmpl $3, %eax
je 1f
#ifdef VM86
testl $PSL_VM, 20(%esp)
jne 1f
#endif
incl %ebx /* system or interrupt */
#ifdef CPL_AND_CML
cmpl $0, _inside_intr
je 1f
incl %ebx /* interrupt */
#endif
1:
movl _cpuid, %eax
movl %ebx, _checkstate_cpustate(,%eax,4)
movl _curproc, %ebx
movl %ebx, _checkstate_curproc(,%eax,4)
movl 12(%esp), %ebx
movl %ebx, _checkstate_pc(,%eax,4)
lock /* checkstate_probed_cpus |= (1<<id) */
btsl %eax, _checkstate_probed_cpus
popl %ds /* restore previous data segment */
popl %ebx
popl %eax
iret
#endif /* BETTER_CLOCK */
/*
* Executed by a CPU when it receives an Xcpuast IPI from another CPU,
*
* - Signals its receipt by clearing bit cpuid in checkstate_need_ast.
*
* - We need a better method of triggering asts on other cpus.
*/
.text
SUPERALIGN_TEXT
.globl _Xcpuast
_Xcpuast:
PUSH_FRAME
movl $KDSEL, %eax
movl %ax, %ds /* use KERNEL data segment */
movl %ax, %es
movl _cpuid, %eax
lock /* checkstate_need_ast &= ~(1<<id) */
btrl %eax, _checkstate_need_ast
movl $0, lapic_eoi /* End Of Interrupt to APIC */
lock
btsl %eax, _checkstate_pending_ast
jc 1f
FAKE_MCOUNT(12*4(%esp))
/*
* Giant locks do not come cheap.
* A lot of cycles are going to be wasted here.
*/
call _get_isrlock
AVCPL_LOCK
#ifdef CPL_AND_CML
movl _cml, %eax
#else
movl _cpl, %eax
#endif
pushl %eax
orl $SWI_AST_PENDING, _ipending
AVCPL_UNLOCK
lock
incb _intr_nesting_level
sti
pushl $0
movl _cpuid, %eax
lock
btrl %eax, _checkstate_pending_ast
lock
btrl %eax, CNAME(resched_cpus)
jz 2f
movl $1, CNAME(want_resched)
lock
incl CNAME(want_resched_cnt)
2:
lock
incl CNAME(cpuast_cnt)
MEXITCOUNT
jmp _doreti
1:
/* We are already in the process of delivering an ast for this CPU */
POP_FRAME
iret
/*
* Executed by a CPU when it receives an XFORWARD_IRQ IPI.
*/
.text
SUPERALIGN_TEXT
.globl _Xforward_irq
_Xforward_irq:
PUSH_FRAME
movl $KDSEL, %eax
movl %ax, %ds /* use KERNEL data segment */
movl %ax, %es
movl $0, lapic_eoi /* End Of Interrupt to APIC */
FAKE_MCOUNT(12*4(%esp))
ISR_TRYLOCK
testl %eax,%eax /* Did we get the lock ? */
jz 1f /* No */
lock
incl CNAME(forward_irq_hitcnt)
cmpb $4, _intr_nesting_level
jae 2f
jmp 3f
AVCPL_LOCK
#ifdef CPL_AND_CML
movl _cml, %eax
#else
movl _cpl, %eax
#endif
pushl %eax
AVCPL_UNLOCK
lock
incb _intr_nesting_level
sti
pushl $0
MEXITCOUNT
jmp _doreti /* Handle forwarded interrupt */
4:
lock
decb _intr_nesting_level
ISR_RELLOCK
MEXITCOUNT
addl $8, %esp
POP_FRAME
iret
1:
lock
incl CNAME(forward_irq_misscnt)
call forward_irq /* Oops, we've lost the isr lock */
MEXITCOUNT
POP_FRAME
iret
2:
lock
incl CNAME(forward_irq_toodeepcnt)
3:
ISR_RELLOCK
MEXITCOUNT
POP_FRAME
iret
/*
*
*/
forward_irq:
MCOUNT
cmpl $0,_invltlb_ok
jz 4f
cmpl $0, CNAME(forward_irq_enabled)
jz 4f
movl _mp_lock,%eax
cmpl $FREE_LOCK,%eax
jne 1f
movl $0, %eax /* Pick CPU #0 if noone has lock */
1:
shrl $24,%eax
movl _cpu_num_to_apic_id(,%eax,4),%ecx
shll $24,%ecx
movl lapic_icr_hi, %eax
andl $~APIC_ID_MASK, %eax
orl %ecx, %eax
movl %eax, lapic_icr_hi
2:
movl lapic_icr_lo, %eax
andl $APIC_DELSTAT_MASK,%eax
jnz 2b
movl lapic_icr_lo, %eax
andl $APIC_RESV2_MASK, %eax
orl $(APIC_DEST_DESTFLD|APIC_DELMODE_FIXED|XFORWARD_IRQ_OFFSET), %eax
movl %eax, lapic_icr_lo
3:
movl lapic_icr_lo, %eax
andl $APIC_DELSTAT_MASK,%eax
jnz 3b
4:
ret
/*
* Executed by a CPU when it receives an Xcpustop IPI from another CPU,
*
* - Signals its receipt.
* - Waits for permission to restart.
* - Signals its restart.
*/
.text
SUPERALIGN_TEXT
.globl _Xcpustop
_Xcpustop:
pushl %ebp
movl %esp, %ebp
pushl %eax
pushl %ecx
pushl %edx
pushl %ds /* save current data segment */
pushl %es
movl $KDSEL, %eax
movl %ax, %ds /* use KERNEL data segment */
movl $0, lapic_eoi /* End Of Interrupt to APIC */
movl _cpuid, %eax
imull $PCB_SIZE, %eax
leal CNAME(stoppcbs)(%eax), %eax
pushl %eax
call CNAME(savectx) /* Save process context */
addl $4, %esp
movl _cpuid, %eax
lock
btsl %eax, _stopped_cpus /* stopped_cpus |= (1<<id) */
1:
btl %eax, _started_cpus /* while (!(started_cpus & (1<<id))) */
jnc 1b
lock
btrl %eax, _started_cpus /* started_cpus &= ~(1<<id) */
lock
btrl %eax, _stopped_cpus /* stopped_cpus &= ~(1<<id) */
test %eax, %eax
jnz 2f
movl CNAME(cpustop_restartfunc), %eax
test %eax, %eax
jz 2f
movl $0, CNAME(cpustop_restartfunc) /* One-shot */
call %eax
2:
popl %es
popl %ds /* restore previous data segment */
popl %edx
popl %ecx
popl %eax
movl %ebp, %esp
popl %ebp
iret
MCOUNT_LABEL(bintr)
FAST_INTR(0,fastintr0)
FAST_INTR(1,fastintr1)
FAST_INTR(2,fastintr2)
FAST_INTR(3,fastintr3)
FAST_INTR(4,fastintr4)
FAST_INTR(5,fastintr5)
FAST_INTR(6,fastintr6)
FAST_INTR(7,fastintr7)
FAST_INTR(8,fastintr8)
FAST_INTR(9,fastintr9)
FAST_INTR(10,fastintr10)
FAST_INTR(11,fastintr11)
FAST_INTR(12,fastintr12)
FAST_INTR(13,fastintr13)
FAST_INTR(14,fastintr14)
FAST_INTR(15,fastintr15)
FAST_INTR(16,fastintr16)
FAST_INTR(17,fastintr17)
FAST_INTR(18,fastintr18)
FAST_INTR(19,fastintr19)
FAST_INTR(20,fastintr20)
FAST_INTR(21,fastintr21)
FAST_INTR(22,fastintr22)
FAST_INTR(23,fastintr23)
INTR(0,intr0)
INTR(1,intr1)
INTR(2,intr2)
INTR(3,intr3)
INTR(4,intr4)
INTR(5,intr5)
INTR(6,intr6)
INTR(7,intr7)
INTR(8,intr8)
INTR(9,intr9)
INTR(10,intr10)
INTR(11,intr11)
INTR(12,intr12)
INTR(13,intr13)
INTR(14,intr14)
INTR(15,intr15)
INTR(16,intr16)
INTR(17,intr17)
INTR(18,intr18)
INTR(19,intr19)
INTR(20,intr20)
INTR(21,intr21)
INTR(22,intr22)
INTR(23,intr23)
MCOUNT_LABEL(eintr)
.data
/*
* Addresses of interrupt handlers.
* XresumeNN: Resumption addresses for HWIs.
*/
.globl _ihandlers
_ihandlers:
ihandlers:
/*
* used by:
* ipl.s: doreti_unpend
*/
.long Xresume0, Xresume1, Xresume2, Xresume3
.long Xresume4, Xresume5, Xresume6, Xresume7
.long Xresume8, Xresume9, Xresume10, Xresume11
.long Xresume12, Xresume13, Xresume14, Xresume15
.long Xresume16, Xresume17, Xresume18, Xresume19
.long Xresume20, Xresume21, Xresume22, Xresume23
/*
* used by:
* ipl.s: doreti_unpend
* apic_ipl.s: splz_unpend
*/
.long swi_tty, swi_net
.long dummycamisr, dummycamisr
.long _swi_vm, 0
.long _softclock, swi_ast
imasks: /* masks for interrupt handlers */
.space NHWI*4 /* padding; HWI masks are elsewhere */
.long SWI_TTY_MASK, SWI_NET_MASK
.long SWI_CAMNET_MASK, SWI_CAMBIO_MASK
.long SWI_VM_MASK, 0
.long SWI_CLOCK_MASK, SWI_AST_MASK
/* active flag for lazy masking */
iactive:
.long 0
#ifdef COUNT_XINVLTLB_HITS
.globl _xhits
_xhits:
.space (NCPU * 4), 0
#endif /* COUNT_XINVLTLB_HITS */
/* variables used by stop_cpus()/restart_cpus()/Xcpustop */
.globl _stopped_cpus, _started_cpus
_stopped_cpus:
.long 0
_started_cpus:
.long 0
#ifdef BETTER_CLOCK
.globl _checkstate_probed_cpus
_checkstate_probed_cpus:
.long 0
#endif /* BETTER_CLOCK */
.globl _checkstate_need_ast
_checkstate_need_ast:
.long 0
_checkstate_pending_ast:
.long 0
.globl CNAME(forward_irq_misscnt)
.globl CNAME(forward_irq_toodeepcnt)
.globl CNAME(forward_irq_hitcnt)
.globl CNAME(resched_cpus)
.globl CNAME(want_resched_cnt)
.globl CNAME(cpuast_cnt)
.globl CNAME(cpustop_restartfunc)
CNAME(forward_irq_misscnt):
.long 0
CNAME(forward_irq_hitcnt):
.long 0
CNAME(forward_irq_toodeepcnt):
.long 0
CNAME(resched_cpus):
.long 0
CNAME(want_resched_cnt):
.long 0
CNAME(cpuast_cnt):
.long 0
CNAME(cpustop_restartfunc):
.long 0
.globl _apic_pin_trigger
_apic_pin_trigger:
.space (NAPIC * 4), 0
/*
* Interrupt counters and names. The format of these and the label names
* must agree with what vmstat expects. The tables are indexed by device
* ids so that we don't have to move the names around as devices are
* attached.
*/
#include "vector.h"
.globl _intrcnt, _eintrcnt
_intrcnt:
.space (NR_DEVICES + ICU_LEN) * 4
_eintrcnt:
.globl _intrnames, _eintrnames
_intrnames:
.ascii DEVICE_NAMES
.asciz "stray irq0"
.asciz "stray irq1"
.asciz "stray irq2"
.asciz "stray irq3"
.asciz "stray irq4"
.asciz "stray irq5"
.asciz "stray irq6"
.asciz "stray irq7"
.asciz "stray irq8"
.asciz "stray irq9"
.asciz "stray irq10"
.asciz "stray irq11"
.asciz "stray irq12"
.asciz "stray irq13"
.asciz "stray irq14"
.asciz "stray irq15"
.asciz "stray irq16"
.asciz "stray irq17"
.asciz "stray irq18"
.asciz "stray irq19"
.asciz "stray irq20"
.asciz "stray irq21"
.asciz "stray irq22"
.asciz "stray irq23"
_eintrnames:
.text
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