Add initial classes representing APIC

2018-05-01 01:03:19 -07:00
parent 6c3bbaa686
commit 428e4563d0
10 changed files with 382 additions and 158 deletions
--- a/src/kernel/apic.cpp
+++ b/src/kernel/apic.cpp
@@ -0,0 +1,106 @@
+#include "apic.h"
+#include "assert.h"
+#include "interrupts.h"
+#include "log.h"
+#include "memory_pages.h"
+
+
+static uint32_t
+apic_read(uint32_t *apic, uint16_t offset)
+{
+	return *(apic + offset/sizeof(uint32_t));
+}
+
+static void
+apic_write(uint32_t *apic, uint16_t offset, uint32_t value)
+{
+	*(apic + offset/sizeof(uint32_t)) = value;
+}
+
+
+apic::apic(uint32_t *base) :
+	m_base(base)
+{
+	g_page_manager.map_offset_pointer(reinterpret_cast<void **>(&m_base), 0x1000);
+}
+
+
+lapic::lapic(uint32_t *base, isr spurious) :
+	apic(base)
+{
+	apic_write(m_base, 0xf0, static_cast<uint32_t>(spurious));
+	log::info(logs::interrupt, "LAPIC created, base %lx", m_base);
+}
+
+void
+lapic::enable_timer(isr vector, uint8_t divisor, uint32_t count, bool repeat)
+{
+	switch (divisor) {
+	case   1: divisor = 11; break;
+	case   2: divisor = 0; break;
+	case   4: divisor = 1; break;
+	case   8: divisor = 2; break;
+	case  16: divisor = 3; break;
+	case  32: divisor = 8; break;
+	case  64: divisor = 9; break;
+	case 128: divisor = 10; break;
+	default:
+		kassert(0, "Invalid divisor passed to lapic::enable_timer");
+	}
+
+	apic_write(m_base, 0x3e0, divisor);
+	apic_write(m_base, 0x380, count);
+
+	uint32_t lvte = static_cast<uint8_t>(vector);
+	if (repeat)
+		lvte |= 0x20000;
+
+	log::debug(logs::interrupt, "Enabling APIC timer with isr %d.", vector);
+	apic_write(m_base, 0x320, lvte);
+}
+
+void
+lapic::enable_lint(uint8_t num, isr vector, bool nmi, uint16_t flags)
+{
+	kassert(num == 0 || num == 1, "Invalid LINT passed to lapic::enable_lint.");
+
+	uint16_t off = num ? 0x360 : 0x350;
+	uint32_t lvte = static_cast<uint8_t>(vector);
+
+	uint16_t polarity = flags & 0x3;
+	if (polarity == 3)
+		lvte |=	(1 << 13);
+
+	uint16_t trigger = (flags >> 2) & 0x3;
+	if (trigger == 3)
+		lvte |= (1 << 15);
+
+	apic_write(m_base, off, lvte);
+	log::debug(logs::interrupt, "APIC LINT%d enabled as %s %d %s-triggered, active %s.",
+			num, nmi ? "NMI" : "ISR", vector,
+			polarity == 3 ? "level" : "edge",
+			trigger == 3 ? "low" : "high");
+}
+
+void
+lapic::enable()
+{
+	apic_write(m_base, 0xf0,
+			apic_read(m_base, 0xf0) | 0x100);
+	log::debug(logs::interrupt, "LAPIC enabled!");
+}
+
+void
+lapic::disable()
+{
+	apic_write(m_base, 0xf0,
+			apic_read(m_base, 0xf0) & ~0x100);
+	log::debug(logs::interrupt, "LAPIC disabled.");
+}
+
+
+ioapic::ioapic(uint32_t *base, uint32_t base_gsr) :
+	apic(base),
+	m_base_gsr(base_gsr)
+{
+}