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x86: Show the interrupt pointer with 'irqinfo'

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It is useful for this command to show the address of the interrupt table.
Add support for this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2020-11-04 09:57:28 -07:00 committed by Bin Meng
parent 8bcfb7917a
commit a0ed800376
3 changed files with 27 additions and 7 deletions
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14
arch/x86/cpu/i386/interrupt.c
View File

@ -180,16 +180,11 @@ struct idt_entry {
u16 base_high; u16 base_high;
} __packed; } __packed;
struct desc_ptr {
unsigned short size;
unsigned long address;
} __packed;
struct idt_entry idt[256] __aligned(16); 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)); asm volatile("cs lidt %0" : : "m" (*dtr));
} }
@ -232,6 +227,11 @@ int cpu_init_interrupts(void)
return 0; return 0;
} }
void interrupt_read_idt(struct idt_ptr *ptr)
{
asm volatile("sidt %0" : : "m" (*ptr));
}
void *x86_get_idt(void) void *x86_get_idt(void)
{ {
return &idt_ptr; return &idt_ptr;

17
arch/x86/include/asm/interrupt.h
View File

@ -38,6 +38,16 @@ enum x86_exception {
EXC_VE 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 */ /* arch/x86/cpu/interrupts.c */
void set_vector(u8 intnum, void *routine); 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); 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 #endif

3
arch/x86/lib/interrupts.c
View File

@ -131,8 +131,11 @@ void do_irq(int hw_irq)
int do_irqinfo(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]) int do_irqinfo(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{ {
#if !CONFIG_IS_ENABLED(X86_64) #if !CONFIG_IS_ENABLED(X86_64)
struct idt_ptr ptr;
int irq; 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", printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
spurious_irq_cnt, spurious_irq); spurious_irq_cnt, spurious_irq);