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mmu: fix deadlock

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Matheus
2022-10-10 10:43:14 -03:00
parent 0bd861c19f
commit af69128800
1 changed files with 3 additions and 1 deletions
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src/arch/x86_64/mmu.c
+3 -1
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@@ -31,7 +31,7 @@ void arch_mmu_switchcontext(arch_mmu_tableptr context){
} }
void* inv = NULL; void* inv = NULL;
int invlock;
semaphore_t sem; semaphore_t sem;
void arch_mmu_invalidateipi(){ void arch_mmu_invalidateipi(){
@@ -40,6 +40,7 @@ void arch_mmu_invalidateipi(){
} }
static void invalidate(void* addr){ static void invalidate(void* addr){
spinlock_acquire(&invlock);
asm("invlpg (%%rax)" : : "a"(addr)); asm("invlpg (%%rax)" : : "a"(addr));
sem.count = -arch_smp_cpucount(); sem.count = -arch_smp_cpucount();
if(!sem.count) return; if(!sem.count) return;
@@ -47,6 +48,7 @@ static void invalidate(void* addr){
inv = addr; inv = addr;
arch_smp_sendipi(0, VECTOR_MMUINVAL, IPI_CPU_ALLBUTSELF); arch_smp_sendipi(0, VECTOR_MMUINVAL, IPI_CPU_ALLBUTSELF);
while(!sem_tryacquire(&sem)) asm("pause"); while(!sem_tryacquire(&sem)) asm("pause");
spinlock_release(&invlock);
} }