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Code Issues Releases Activity

When DTrace is enabled, make sure we don't overwrite the IDT_DTRACE_RET

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entry with an IRQ for some hardware component.

Reviewed by:	jhb
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Rui Paulo 2010-08-30 18:12:21 +00:00
parent de478dd4b4
commit 400dda6646
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=212004
1 changed files with 25 additions and 0 deletions
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25
sys/x86/x86/local_apic.c
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@ -89,6 +89,7 @@ CTASSERT(IPI_STOP < APIC_SPURIOUS_INT);
/* Magic IRQ values for the timer and syscalls. */
#define IRQ_TIMER (NUM_IO_INTS + 1)
#define IRQ_SYSCALL (NUM_IO_INTS + 2)
#define IRQ_DTRACE_RET (NUM_IO_INTS + 3)
/*
* Support for local APICs. Local APICs manage interrupts on each
@ -307,6 +308,10 @@ lapic_create(u_int apic_id, int boot_cpu)
lapics[apic_id].la_ioint_irqs[IDT_SYSCALL - APIC_IO_INTS] = IRQ_SYSCALL;
lapics[apic_id].la_ioint_irqs[APIC_TIMER_INT - APIC_IO_INTS] =
IRQ_TIMER;
#ifdef KDTRACE_HOOKS
lapics[apic_id].la_ioint_irqs[IDT_DTRACE_RET - APIC_IO_INTS] = IRQ_DTRACE_RET;
#endif
#ifdef SMP
cpu_add(apic_id, boot_cpu);
@ -1028,6 +1033,10 @@ apic_enable_vector(u_int apic_id, u_int vector)
KASSERT(vector != IDT_SYSCALL, ("Attempt to overwrite syscall entry"));
KASSERT(ioint_handlers[vector / 32] != NULL,
("No ISR handler for vector %u", vector));
#ifdef KDTRACE_HOOKS
KASSERT(vector != IDT_DTRACE_RET,
("Attempt to overwrite DTrace entry"));
#endif
setidt(vector, ioint_handlers[vector / 32], SDT_APIC, SEL_KPL,
GSEL_APIC);
}
@ -1037,6 +1046,10 @@ apic_disable_vector(u_int apic_id, u_int vector)
{
KASSERT(vector != IDT_SYSCALL, ("Attempt to overwrite syscall entry"));
#ifdef KDTRACE_HOOKS
KASSERT(vector != IDT_DTRACE_RET,
("Attempt to overwrite DTrace entry"));
#endif
KASSERT(ioint_handlers[vector / 32] != NULL,
("No ISR handler for vector %u", vector));
#ifdef notyet
@ -1060,6 +1073,10 @@ apic_free_vector(u_int apic_id, u_int vector, u_int irq)
KASSERT(irq < NUM_IO_INTS, ("Invalid IRQ %u", irq));
KASSERT(lapics[apic_id].la_ioint_irqs[vector - APIC_IO_INTS] ==
irq, ("IRQ mismatch"));
#ifdef KDTRACE_HOOKS
KASSERT(vector != IDT_DTRACE_RET,
("Attempt to overwrite DTrace entry"));
#endif
/*
* Bind us to the cpu that owned the vector before freeing it so
@ -1092,6 +1109,10 @@ apic_idt_to_irq(u_int apic_id, u_int vector)
KASSERT(vector >= APIC_IO_INTS && vector != IDT_SYSCALL &&
vector <= APIC_IO_INTS + APIC_NUM_IOINTS,
("Vector %u does not map to an IRQ line", vector));
#ifdef KDTRACE_HOOKS
KASSERT(vector != IDT_DTRACE_RET,
("Attempt to overwrite DTrace entry"));
#endif
irq = lapics[apic_id].la_ioint_irqs[vector - APIC_IO_INTS];
if (irq < 0)
irq = 0;
@ -1123,6 +1144,10 @@ DB_SHOW_COMMAND(apic, db_show_apic)
irq = lapics[apic_id].la_ioint_irqs[i];
if (irq == -1 || irq == IRQ_SYSCALL)
continue;
#ifdef KDTRACE_HOOKS
if (irq == IRQ_DTRACE_RET)
continue;
#endif
db_printf("vec 0x%2x -> ", i + APIC_IO_INTS);
if (irq == IRQ_TIMER)
db_printf("lapic timer\n");