x86_64: init local apic on boot, or legacy pic/pit as fallback

arch/x86_64/include/arch/acpi.h

@@ -13,6 +13,11 @@
 #define ACPI_SIG_FADT 0x50434146
 #define ACPI_SIG_MADT 0x43495041
 
+#define AP_TRAMPOLINE_PADDR   0x8000
+#define LAPIC_IPI_STATUS_REG  0x0280
+#define LAPIC_IPI_DEST_REG    0x0310
+#define LAPIC_IPI_ICR_REG     0x0300
+
 struct acpi_rsdp_10 {
 	char r_sig[8];
 	uint8_t r_chksum;
@@ -65,9 +70,29 @@ struct acpi_madt {
 	uint32_t m_flags;
 } __packed;
 
+struct acpi_madt_record {
+	uint8_t r_type;
+	uint8_t r_length;
+} __packed;
+
+struct lapic_record {
+	uint8_t l_cpu_id;
+	uint8_t l_apic_id;
+	uint32_t l_flags;
+} __packed;
+
+struct lapic_override_record {
+	uint16_t l_reserved;
+	uint64_t l_lapic_ptr;
+} __packed;
+
+
 extern kern_status_t acpi_init(void);
 extern kern_status_t acpi_scan_cpu_topology(void);
 
+extern kern_status_t apic_init(void);
+extern kern_status_t smp_init(void);
+
 extern struct acpi_sdt *acpi_find_sdt(uint32_t sig);
 
 #endif

arch/x86_64/include/arch/irq.h

@@ -2,10 +2,35 @@
 #define ARCH_IRQ_H_
 
 #include <socks/compiler.h>
+#include <socks/queue.h>
 #include <stdint.h>
 
 #define NR_IDT_ENTRIES 48
 
+typedef enum irq_vector {
+	IRQ0 = 32,
+	IRQ1,
+	IRQ2,
+	IRQ3,
+	IRQ4,
+	IRQ5,
+	IRQ6,
+	IRQ7,
+	IRQ8,
+	IRQ9,
+	IRQ10,
+	IRQ11,
+	IRQ12,
+	IRQ13,
+	IRQ14,
+	IRQ15,
+} irq_vector_t;
+
+typedef struct irq_hook {
+	queue_entry_t irq_entry;
+	int (*irq_callback)(void);
+} irq_hook_t;
+
 struct cpu_context {
     uint64_t r15, r14, r13, r12, r11, r10, r9, r8;
     uint64_t rdi, rsi, rbp, unused_rsp, rbx, rdx, rcx, rax;
@@ -40,4 +65,6 @@ typedef void (*int_hook)(struct cpu_context *);
 extern int idt_init(struct idt_ptr *idtp);
 extern int idt_load(struct idt_ptr *idtp);
 
+extern void hook_irq(irq_vector_t vec, irq_hook_t *hook);
+
 #endif

arch/x86_64/include/arch/pit.h

@@ -0,0 +1,6 @@
+#ifndef ARCH_PIT_H_
+#define ARCH_PIT_H_
+
+extern void pit_init(unsigned int hz);
+
+#endif

arch/x86_64/include/socks/machine/cpu.h

@@ -16,6 +16,9 @@ typedef struct ml_cpu_block {
 	unsigned int c_cpu_id;
 } ml_cpu_block;
 
+#define ml_cpu_pause() asm volatile("hlt")
+#define ml_cpu_relax() asm volatile("pause")
+
 extern int ml_init_bootcpu(void);
 
 extern int ml_cpu_block_init(ml_cpu_block *p);