diff --git a/arch/x86/cpu/i386/interrupt.c b/arch/x86/cpu/i386/interrupt.c index c0c4bc95fd9a0aaa7514cd555a9004bd5b62da9c..d85f84b29a75fa6099de8b993e30da847a9c0554 100644 --- a/arch/x86/cpu/i386/interrupt.c +++ b/arch/x86/cpu/i386/interrupt.c @@ -180,16 +180,11 @@ struct idt_entry { u16 base_high; } __packed; -struct desc_ptr { - unsigned short size; - unsigned long address; -} __packed; - struct idt_entry idt[256] __aligned(16); -struct desc_ptr idt_ptr; +struct idt_ptr idt_ptr; -static inline void load_idt(const struct desc_ptr *dtr) +static inline void load_idt(const struct idt_ptr *dtr) { asm volatile("cs lidt %0" : : "m" (*dtr)); } @@ -232,6 +227,11 @@ int cpu_init_interrupts(void) return 0; } +void interrupt_read_idt(struct idt_ptr *ptr) +{ + asm volatile("sidt %0" : : "m" (*ptr)); +} + void *x86_get_idt(void) { return &idt_ptr; diff --git a/arch/x86/include/asm/interrupt.h b/arch/x86/include/asm/interrupt.h index fdeb85711323b59c139d3fa0f2695a453a833ef6..e23fb2c8e72f0191f39eefd6dc8a1f0a09797b30 100644 --- a/arch/x86/include/asm/interrupt.h +++ b/arch/x86/include/asm/interrupt.h @@ -38,6 +38,16 @@ enum x86_exception { EXC_VE }; +/** + * struct idt_ptr - Holds the IDT (Interrupt Descriptor Table) + * + * @size: Size of IDT in bytes + */ +struct idt_ptr { + unsigned short size; + unsigned long address; +} __packed; + /* arch/x86/cpu/interrupts.c */ void set_vector(u8 intnum, void *routine); @@ -61,4 +71,11 @@ void configure_irq_trigger(int int_num, bool is_level_triggered); void *x86_get_idt(void); +/** + * interrupt_read_idt() - Read the IDT + * + * @ptr: Place to put IDT contents + */ +void interrupt_read_idt(struct idt_ptr *ptr); + #endif diff --git a/arch/x86/lib/interrupts.c b/arch/x86/lib/interrupts.c index a81e4291105ec583279bb5908e97395ca685fbf0..ff52959ed285e241523bbdb960c5d2e1981d3b86 100644 --- a/arch/x86/lib/interrupts.c +++ b/arch/x86/lib/interrupts.c @@ -131,8 +131,11 @@ void do_irq(int hw_irq) int do_irqinfo(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]) { #if !CONFIG_IS_ENABLED(X86_64) + struct idt_ptr ptr; int irq; + interrupt_read_idt(&ptr); + printf("IDT at %lx, size %x\n", ptr.address, ptr.size); printf("Spurious IRQ: %u, last unknown IRQ: %d\n", spurious_irq_cnt, spurious_irq);