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>

3 files changed, 20 insertions, 6 deletions

diff --git a/arch/x86/kernel/i8259_32.c b/arch/x86/kernel/i8259_32.c
index d34a10cc13a7..f634fc715c99 100644
--- a/arch/x86/kernel/i8259_32.c
+++ b/arch/x86/kernel/i8259_32.c
@@ -403,7 +403,8 @@ void __init native_init_IRQ(void)
                 int vector = FIRST_EXTERNAL_VECTOR + i;
                 if (i >= NR_IRQS)
                         break;
-                if (vector != SYSCALL_VECTOR) 
+                /* SYSCALL_VECTOR was reserved in trap_init. */
+                if (!test_bit(vector, used_vectors))
                         set_intr_gate(vector, interrupt[i]);
         }
 
diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c
index 5f10c7189534..0c55e9d86f69 100644
--- a/arch/x86/kernel/io_apic_32.c
+++ b/arch/x86/kernel/io_apic_32.c
@@ -1198,7 +1198,7 @@ static u8 irq_vector[NR_IRQ_VECTORS] __read_mostly = { FIRST_DEVICE_VECTOR , 0 }
 static int __assign_irq_vector(int irq)
 {
         static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0;
-        int vector, offset, i;
+        int vector, offset;
 
         BUG_ON((unsigned)irq >= NR_IRQ_VECTORS);
 
@@ -1215,11 +1215,8 @@ next:
         }
         if (vector == current_vector)
                 return -ENOSPC;
-        if (vector == SYSCALL_VECTOR)
+        if (test_and_set_bit(vector, used_vectors))
                 goto next;
-        for (i = 0; i < NR_IRQ_VECTORS; i++)
-                if (irq_vector[i] == vector)
-                        goto next;
 
         current_vector = vector;
         current_offset = offset;
@@ -2295,6 +2292,12 @@ static inline void __init check_timer(void)
 
 void __init setup_IO_APIC(void)
 {
+        int i;
+
+        /* Reserve all the system vectors. */
+        for (i = FIRST_SYSTEM_VECTOR; i < NR_VECTORS; i++)
+                set_bit(i, used_vectors);
+
         enable_IO_APIC();
 
         if (acpi_ioapic)
diff --git a/arch/x86/kernel/traps_32.c b/arch/x86/kernel/traps_32.c
index 3f02e0f42e6a..47e6d10902fe 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.
          */