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mmu: Try to perform really bad TLB shootdowns?

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This commit is contained in:
K. Lange 2021-06-01 22:37:54 +09:00
parent e9d34d669b
commit 839dda7d41
5 changed files with 25 additions and 2 deletions
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1
base/usr/include/kernel/arch/x86_64/irq.h
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@ -50,6 +50,7 @@ extern struct regs * _irq12(struct regs*);
extern struct regs * _irq13(struct regs*);
extern struct regs * _irq14(struct regs*);
extern struct regs * _irq15(struct regs*);
extern struct regs * _isr124(struct regs*); /* Does not actually take regs */
extern struct regs * _isr125(struct regs*); /* Does not actually take regs */
extern struct regs * _isr126(struct regs*); /* Does not actually take regs */
extern struct regs * _isr127(struct regs*); /* Syscall entry point */

5
kernel/arch/x86_64/idt.c
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@ -86,9 +86,10 @@ void idt_install(void) {
idt_set_gate(46, _irq14, 0x08, 0x8E, 0);
idt_set_gate(47, _irq15, 0x08, 0x8E, 0);
idt_set_gate(124, _isr124, 0x08, 0x8E, 0); /* Bad TLB shootdown. */
idt_set_gate(125, _isr125, 0x08, 0x8E, 0); /* Halts everyone. */
idt_set_gate(126, _isr126, 0x08, 0x8E, 0); /* Intentionally does nothing. */
idt_set_gate(127, _isr127, 0x08, 0x8E, 1);
idt_set_gate(126, _isr126, 0x08, 0x8E, 0); /* Does nothing, used to exit wait-for-interrupt sleep. */
idt_set_gate(127, _isr127, 0x08, 0x8E, 1); /* Legacy system call entry point, called by userspace. */
asm volatile (
"lidt %0"

12
kernel/arch/x86_64/irq.S
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@ -80,6 +80,18 @@ IRQ 15, 47
/* syscall entry point */
ISR_NOERR 127
.global _isr124
.type _isr124, @function
_isr124:
pushq %r12
mov %cr3, %r12
mov %r12, %cr3
mov (lapic_final), %r12
add $0xb0, %r12
movl $0, (%r12)
popq %r12
iretq
/* No op, used to signal sleeping processor to wake and check the queue. */
.extern lapic_final
.global _isr126

3
kernel/arch/x86_64/mmu.c
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@ -13,6 +13,8 @@
#include <kernel/arch/x86_64/pml.h>
#include <kernel/arch/x86_64/mmu.h>
extern void arch_tlb_shootdown(void);
/**
* bitmap page allocator for 4KiB pages
*/
@ -630,6 +632,7 @@ void mmu_invalidate(uintptr_t addr) {
asm volatile (
"invlpg (%0)"
: : "r"(addr));
arch_tlb_shootdown();
}
static char * heapStart = NULL;

6
kernel/arch/x86_64/smp.c
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@ -294,3 +294,9 @@ void arch_wakeup_others(void) {
* It should be gentle enough that busy cores dont't care. */
lapic_send_ipi(0, 0x7E | (3 << 18));
}
void arch_tlb_shootdown(void) {
if (!lapic_final || processor_count < 2) return;
lapic_send_ipi(0, 0x7C | (3 << 18));
}