aboutsummaryrefslogtreecommitdiff
path: root/arch/x86/kernel/traps_32.c
diff options
context:
space:
mode:
authorRusty Russell <rusty@rustcorp.com.au>2007-10-19 20:35:03 +0200
committerThomas Gleixner <tglx@linutronix.de>2007-10-19 20:35:03 +0200
commitdbeb2be21d678c49a8d8bbf774903df15dd55474 (patch)
treecea1b478ec3af36134aa06633be1a45787f35f75 /arch/x86/kernel/traps_32.c
parent39743c9ef717fd4f2b5583f010115c5f2482b8ae (diff)
i386: introduce "used_vectors" bitmap which can be used to reserve vectors.
This simplifies the io_apic.c __assign_irq_vector() logic and removes the explicit SYSCALL_VECTOR check, and also allows for vectors to be reserved by other mechanisms (ie. lguest). [ tglx: arch/x86 adaptation ] Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/traps_32.c')
-rw-r--r--arch/x86/kernel/traps_32.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/kernel/traps_32.c b/arch/x86/kernel/traps_32.c
index 3f02e0f42e6..47e6d10902f 100644
--- a/arch/x86/kernel/traps_32.c
+++ b/arch/x86/kernel/traps_32.c
@@ -63,6 +63,9 @@
int panic_on_unrecovered_nmi;
+DECLARE_BITMAP(used_vectors, NR_VECTORS);
+EXPORT_SYMBOL_GPL(used_vectors);
+
asmlinkage int system_call(void);
/* Do we ignore FPU interrupts ? */
@@ -1120,6 +1123,8 @@ static void __init set_task_gate(unsigned int n, unsigned int gdt_entry)
void __init trap_init(void)
{
+ int i;
+
#ifdef CONFIG_EISA
void __iomem *p = ioremap(0x0FFFD9, 4);
if (readl(p) == 'E'+('I'<<8)+('S'<<16)+('A'<<24)) {
@@ -1179,6 +1184,11 @@ void __init trap_init(void)
set_system_gate(SYSCALL_VECTOR,&system_call);
+ /* Reserve all the builtin and the syscall vector. */
+ for (i = 0; i < FIRST_EXTERNAL_VECTOR; i++)
+ set_bit(i, used_vectors);
+ set_bit(SYSCALL_VECTOR, used_vectors);
+
/*
* Should be a barrier for any external CPU state.
*/