cpu: rename _cpu() to current_cpu()

kernel-src/arch/x86-64/apic.c

@@ -166,26 +166,26 @@ void arch_apic_initap() {
 	interrupt_register(0xff, spurious, NULL, IPL_IGNORE);
 	writelapic(APIC_REG_SPURIOUS, 0x1FF);
 
-	_cpu()->id = readlapic(APIC_REG_ID) >> 24;
+	current_cpu()->id = readlapic(APIC_REG_ID) >> 24;
 
 	// get the acpi id for the local nmi sources
 
 	for (size_t i = 0; i < lapiccount; ++i) {
 		struct acpi_madt_lapic *current = getentry(ACPI_MADT_ENTRY_TYPE_LAPIC, i);
-		if (_cpu()->id == current->id) {
-			_cpu()->acpiid = current->uid;
+		if (current_cpu()->id == current->id) {
+			current_cpu()->acpiid = current->uid;
 			break;
 		}
 	}
 
-	printf("processor id: %lu (APIC) %lu (ACPI)\n", _cpu()->id, _cpu()->acpiid);
+	printf("processor id: %lu (APIC) %lu (ACPI)\n", current_cpu()->id, current_cpu()->acpiid);
 
 	isr_t *nmiisr = interrupt_allocate(nmi, NULL, IPL_MAX); // MAX IPL because NMI
 	__assert(nmiisr);
 
 	for (size_t i = 0; i < lapicnmicount; ++i) {
 		struct acpi_madt_lapic_nmi* current = getentry(ACPI_MADT_ENTRY_TYPE_LAPIC_NMI, i);
-		if (current->uid == _cpu()->acpiid || current->uid == 0xff)
+		if (current->uid == current_cpu()->acpiid || current->uid == 0xff)
 			writelapic(APIC_LVT_LINT0 + 0x10 * current->lint, (nmiisr->id & 0xff) | LVT_DELIVERY_NMI | (current->flags << 12));
 	}
 }
@@ -204,7 +204,7 @@ static time_t stoptimer() {
 }
 
 static void timerisr(isr_t *isr, context_t *context) {
-	timer_isr(_cpu()->timer, context);
+	timer_isr(current_cpu()->timer, context);
 }
 
 static void armtimer(time_t ticks) {
@@ -233,12 +233,12 @@ void arch_apic_timerinit() {
 
 	writelapic(APIC_TIMER_INITIALCOUNT, 0);
 
-	printf("cpu%lu: local apic timer calibrated at %lu ticks per us. ISR vector %lu\n", _cpu()->id, ticksperus, vec);
+	printf("cpu%lu: local apic timer calibrated at %lu ticks per us. ISR vector %lu\n", current_cpu()->id, ticksperus, vec);
 
 	writelapic(APIC_LVT_TIMER, vec);
 
-	_cpu()->timer = timer_new(ticksperus, armtimer, stoptimer);
-	__assert(_cpu()->timer);
+	current_cpu()->timer = timer_new(ticksperus, armtimer, stoptimer);
+	__assert(current_cpu()->timer);
 }
 
 void arch_apic_sendipi(uint8_t cpu, uint8_t vec, uint8_t dest, uint8_t mode, uint8_t level) {

kernel-src/arch/x86-64/gdt.c

@@ -21,18 +21,18 @@ typedef struct {
 } __attribute__((packed)) gdtr_t;
 
 void arch_gdt_reload() {
-	memcpy(_cpu()->gdt, template, sizeof(template));
-	uintptr_t istaddr = (uintptr_t)&_cpu()->ist;
+	memcpy(current_cpu()->gdt, template, sizeof(template));
+	uintptr_t istaddr = (uintptr_t)&current_cpu()->ist;
 
 	// add ist to gdt
-	_cpu()->gdt[5] |= ((istaddr & 0xff000000) << 32) | ((istaddr & 0xff0000) << 16) | ((istaddr & 0xffff) << 16) | sizeof(ist_t);
-	_cpu()->gdt[6] = (istaddr >> 32) & 0xffffffff;
+	current_cpu()->gdt[5] |= ((istaddr & 0xff000000) << 32) | ((istaddr & 0xff0000) << 16) | ((istaddr & 0xffff) << 16) | sizeof(ist_t);
+	current_cpu()->gdt[6] = (istaddr >> 32) & 0xffffffff;
 
 	// reload gdt and ist
 
 	gdtr_t gdtr = {
 		.size = sizeof(template) - 1,
-		.address = (uintptr_t)&_cpu()->gdt
+		.address = (uintptr_t)&current_cpu()->gdt
 	};
 
 	asm volatile("lgdt (%%rax)" : : "a"(&gdtr) : "memory");

kernel-src/arch/x86-64/idt.c

@@ -81,7 +81,7 @@ void arch_idt_reload() {
 	for (int i = 0; i < 32; ++i)
 		interrupt_register(i, exceptisr, NULL, IPL_IGNORE);
 
-	_cpu()->ipl = IPL_NORMAL;
+	current_cpu()->ipl = IPL_NORMAL;
 	interrupt_set(true);
 }
 

kernel-src/arch/x86-64/mmu.c

@@ -232,7 +232,7 @@ void arch_mmu_tlbshootdown(void *page) {
 		mmupage = page;
 		remaining = arch_smp_cpusawake - 1;
 
-		arch_smp_sendipi(NULL, &_cpu()->isr[0xfe], ARCH_SMP_IPI_OTHERCPUS, false);
+		arch_smp_sendipi(NULL, &current_cpu()->isr[0xfe], ARCH_SMP_IPI_OTHERCPUS, false);
 
 		while (__atomic_load_n(&remaining, __ATOMIC_SEQ_CST)) CPU_PAUSE();
 

kernel-src/arch/x86-64/smp.c

@@ -44,7 +44,7 @@ void arch_smp_sendipi(cpu_t *targcpu, isr_t *isr, int target, bool nmi) {
 }
 
 void arch_smp_haltallothers() {
-	arch_smp_sendipi(NULL, &_cpu()->isr[0xfd], ARCH_SMP_IPI_OTHERCPUS, true);
+	arch_smp_sendipi(NULL, &current_cpu()->isr[0xfd], ARCH_SMP_IPI_OTHERCPUS, true);
 }
 
 void arch_smp_wakeup() {