diff options
Diffstat (limited to 'arch/x86/kernel/idt.c')
| -rw-r--r-- | arch/x86/kernel/idt.c | 33 |
1 files changed, 20 insertions, 13 deletions
diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c index b609eac3d73c..61b490c69250 100644 --- a/arch/x86/kernel/idt.c +++ b/arch/x86/kernel/idt.c @@ -225,6 +225,22 @@ idt_setup_from_table(gate_desc *idt, const struct idt_data *t, int size, bool sy } } +static void set_intr_gate(unsigned int n, const void *addr) +{ + struct idt_data data; + + BUG_ON(n > 0xFF); + + memset(&data, 0, sizeof(data)); + data.vector = n; + data.addr = addr; + data.segment = __KERNEL_CS; + data.bits.type = GATE_INTERRUPT; + data.bits.p = 1; + + idt_setup_from_table(idt_table, &data, 1, false); +} + /** * idt_setup_early_traps - Initialize the idt table with early traps * @@ -336,20 +352,11 @@ void idt_invalidate(void *addr) load_idt(&idt); } -void set_intr_gate(unsigned int n, const void *addr) +void __init update_intr_gate(unsigned int n, const void *addr) { - struct idt_data data; - - BUG_ON(n > 0xFF); - - memset(&data, 0, sizeof(data)); - data.vector = n; - data.addr = addr; - data.segment = __KERNEL_CS; - data.bits.type = GATE_INTERRUPT; - data.bits.p = 1; - - idt_setup_from_table(idt_table, &data, 1, false); + if (WARN_ON_ONCE(!test_bit(n, used_vectors))) + return; + set_intr_gate(n, addr); } void alloc_intr_gate(unsigned int n, const void *addr) |