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Because of the two cascaded PICs, we can't allow to ever diable IRQ 2.

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arch_int_init has already enabled it, and enabling it again is never a problem.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@357 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
beveloper
2002-07-20 23:49:24 +00:00
parent 2cf15ffd36
commit 279d2a69e9
1 changed files with 3 additions and 2 deletions
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src/kernel/core/arch/x86/arch_int.c
+3 -2
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@@ -90,7 +90,8 @@ dprintf("arch_int_enable_io_interrupt: irq %d\n", irq);
void arch_int_disable_io_interrupt(int irq) void arch_int_disable_io_interrupt(int irq)
{ {
if (irq < 0 || irq >= 0x10) /* never disable slave pic line IRQ 2 */
if (irq < 0 || irq >= 0x10 || irq == 2)
return; return;
/* if this is a external interrupt via 8239, disable it here */ /* if this is a external interrupt via 8239, disable it here */
if (irq < 8) if (irq < 8)
@@ -268,7 +269,7 @@ int arch_int_init(kernel_args *ka)
out8(0x02, 0xa1); // Set #2 to be the slave. out8(0x02, 0xa1); // Set #2 to be the slave.
out8(0x01, 0x21); // Set both to operate in 8086 mode. out8(0x01, 0x21); // Set both to operate in 8086 mode.
out8(0x01, 0xa1); out8(0x01, 0xa1);
out8(0xfb, 0x21); // Mask off all interrupts (except slave pic line). out8(0xfb, 0x21); // Mask off all interrupts (except slave pic line IRQ 2).
out8(0xff, 0xa1); // Mask off interrupts on the slave. out8(0xff, 0xa1); // Mask off interrupts on the slave.
set_intr_gate(0, &trap0); set_intr_gate(0, &trap0);