Implement APIC, RTC, basic ACPI parser and timer support

[lunaix-os.git] / lunaix-os / includes / hal / apic.h

diff --git a/lunaix-os/includes/hal/apic.h b/lunaix-os/includes/hal/apic.h
new file mode 100644 (file)
index 0000000..851e75e
--- /dev/null
+++ b/lunaix-os/includes/hal/apic.h
@@ -0,0 +1,82 @@
+#ifndef __LUNAIX_APIC_H
+#define __LUNAIX_APIC_H
+
+#include <stdint.h>
+
+#define APIC_BASE_VADDR 0x1000
+#define __APIC_BASE_PADDR 0xFEE00000
+
+#define IA32_APIC_BASE_MSR 0x1B
+#define IA32_APIC_ENABLE   0x800
+
+/*
+ *  Common APIC memory-mapped registers 
+ *              Ref: Intel Manual, Vol. 3A, Table 10-1
+ */
+
+#define APIC_IDR        0x20        // ID Reg
+#define APIC_VER        0x30        // Version Reg
+#define APIC_TPR        0x80        // Task Priority
+#define APIC_APR        0x90        // Arbitration Priority
+#define APIC_PPR        0xA0        // Processor Priority
+#define APIC_EOI        0xB0        // End-Of-Interrupt
+#define APIC_RRD        0xC0        // Remote Read
+#define APIC_LDR        0xD0        // Local Destination Reg
+#define APIC_DFR        0xE0        // Destination Format Reg
+#define APIC_SPIVR      0xF0        // Spurious Interrupt Vector Reg
+#define APIC_ISR_BASE   0x100       // Base address for In-Service-Interrupt bitmap register (256bits)
+#define APIC_TMR_BASE   0x180       // Base address for Trigger-Mode bitmap register (256bits)
+#define APIC_IRR_BASE   0x200       // Base address for Interrupt-Request bitmap register (256bits)
+#define APIC_ESR        0x280       // Error Status Reg
+#define APIC_ICR_BASE   0x300       // Interrupt Command
+#define APIC_LVT_LINT0  0x350
+#define APIC_LVT_LINT1  0x360
+#define APIC_LVT_ERROR  0x370
+
+// APIC Timer specific
+#define APIC_TIMER_LVT  0x320
+#define APIC_TIMER_ICR  0x380       // Initial Count
+#define APIC_TIMER_CCR  0x390       // Current Count
+#define APIC_TIMER_DCR  0x3E0       // Divide Configuration
+
+#define APIC_SPIV_FOCUS_DISABLE     0x200
+#define APIC_SPIV_APIC_ENABLE       0x100
+#define APIC_SPIV_EOI_BROADCAST     0x1000
+
+#define LVT_DELIVERY_FIXED          0
+#define LVT_DELIVERY_NMI            (0x4 << 8)
+#define LVT_TRIGGER_EDGE            (0   << 15)
+#define LVT_TRIGGER_LEVEL           (1   << 15)
+#define LVT_MASKED                  (1   << 16)
+#define LVT_TIMER_ONESHOT           (0   << 17)
+#define LVT_TIMER_PERIODIC          (1   << 17)
+
+// Dividers for timer. See Intel Manual Vol3A. 10-17 (pp. 3207), Figure 10-10
+#define APIC_TIMER_DIV1             0b1011
+#define APIC_TIMER_DIV2             0b0000
+#define APIC_TIMER_DIV4             0b0001
+#define APIC_TIMER_DIV8             0b0010
+#define APIC_TIMER_DIV16            0b0011
+#define APIC_TIMER_DIV32            0b1000
+#define APIC_TIMER_DIV64            0b1001
+#define APIC_TIMER_DIV128           0b1010
+
+#define APIC_PRIORITY(cls, subcls)  (((cls) << 4) | (subcls))
+
+#define apic_read_reg(reg)           (*(uint32_t*)(APIC_BASE_VADDR + (reg)))
+#define apic_write_reg(reg, val)     (*(uint32_t*)(APIC_BASE_VADDR + (reg)) = (val))
+
+void
+init_apic();
+
+/**
+ * @brief Tell the APIC that the handler for current interrupt is finished.
+ * This will issue a write action to EOI register.
+ * 
+ */
+inline static void
+apic_done_servicing() {
+    apic_write_reg(APIC_EOI, 0);
+}
+
+#endif /* __LUNAIX_APIC_H */