x86: change FIRST_SYSTEM_VECTOR to a variable

The SGI UV system needs several more system vectors than a vanilla
x86_64 system.  Rather than burden the other archs with extra system
vectors that they don't use, change FIRST_SYSTEM_VECTOR to a variable,
so that it can be dynamic.

Signed-off-by: Alan Mayer <ajm@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 22 insertions, 2 deletions

diff --git a/include/asm-x86/desc.h b/include/asm-x86/desc.h
index 268a012bcd79..b3875d4b4fab 100644
--- a/include/asm-x86/desc.h
+++ b/include/asm-x86/desc.h
@@ -311,6 +311,28 @@ static inline void set_intr_gate(unsigned int n, void *addr)
         _set_gate(n, GATE_INTERRUPT, addr, 0, 0, __KERNEL_CS);
 }
 
+#define SYS_VECTOR_FREE         0
+#define SYS_VECTOR_ALLOCED      1
+
+extern int first_system_vector;
+extern char system_vectors[];
+
+static inline void alloc_system_vector(int vector)
+{
+        if (system_vectors[vector] == SYS_VECTOR_FREE) {
+                system_vectors[vector] = SYS_VECTOR_ALLOCED;
+                if (first_system_vector > vector)
+                        first_system_vector = vector;
+        } else
+                BUG();
+}
+
+static inline void alloc_intr_gate(unsigned int n, void *addr)
+{
+        alloc_system_vector(n);
+        set_intr_gate(n, addr);
+}
+
 /*
  * This routine sets up an interrupt gate at directory privilege level 3.
  */
diff --git a/include/asm-x86/irq_vectors.h b/include/asm-x86/irq_vectors.h
index daceaaf0a3a4..3cb6d8c77b39 100644
--- a/include/asm-x86/irq_vectors.h
+++ b/include/asm-x86/irq_vectors.h
@@ -96,8 +96,6 @@
 # define FIRST_DEVICE_VECTOR    (IRQ15_VECTOR + 2)
 #endif
 
-#define FIRST_SYSTEM_VECTOR     0xef
-
 #define NR_VECTORS              256
 
 #define FPU_IRQ                 13