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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>
This commit is contained in:
Rusty Russell 2007-10-19 20:35:03 +02:00 committed by Thomas Gleixner
parent 39743c9ef7
commit dbeb2be21d
4 changed files with 23 additions and 6 deletions
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3
arch/x86/kernel/i8259_32.c
View File

@ -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]);
}

13
arch/x86/kernel/io_apic_32.c
View File

@ -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 @@ static int __assign_irq_vector(int irq)
}
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)

10
arch/x86/kernel/traps_32.c
View File

@ -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.
*/

3
include/asm-x86/irq_32.h
View File

@ -45,4 +45,7 @@ unsigned int do_IRQ(struct pt_regs *regs);
void init_IRQ(void);
void __init native_init_IRQ(void);
/* Interrupt vector management */
extern DECLARE_BITMAP(used_vectors, NR_VECTORS);
#endif /* _ASM_IRQ_H */