kernel: profiling infrastructure

kernel-src/include/kernel/devfs.h

@@ -20,6 +20,7 @@
 #define DEV_MAJOR_MOUSE 11
 #define DEV_MAJOR_PTY 12
 #define DEV_MAJOR_ACPI 13
+#define DEV_MAJOR_PROF 14
 
 typedef struct {
 	int (*open)(int minor, vnode_t **vnode, int flags);

kernel-src/include/kernel/prof.h

@@ -0,0 +1,6 @@
+#ifndef _PROF_H
+#define _PROF_H
+
+void profiling_insert(uint8_t size, void *data);
+
+#endif

kernel-src/include/x86-64/arch/apic.h

@@ -7,6 +7,7 @@ void arch_apic_timerinit();
 void arch_apic_init();
 void arch_apic_initap();
 void arch_apic_eoi();
+void arch_apic_init_perf(void);
 void arch_ioapic_setirq(uint8_t gsi, uint8_t vector, uint8_t proc, bool masked);
 void arch_apic_sendipi(uint8_t cpu, uint8_t vec, uint8_t dest, uint8_t mode, uint8_t level);
 

kernel-src/include/x86-64/arch/cpu.h

@@ -13,6 +13,7 @@
 #include <kernel/dpc.h>
 #include <arch/apic.h>
 #include <kernel/timekeeper.h>
+#include <ringbuffer.h>
 
 #define ARCH_EOI arch_apic_eoi
 
@@ -68,6 +69,10 @@ typedef struct cpu_t {
 	spinlock_t shootdown_lock;
 	int *shootdown_done;
 
+#ifdef ENABLE_PROFILING
+	ringbuffer_t *prof_ringbuffer;
+#endif
+
 	// architecture specific, does not need to be exposed
 
 	uint64_t gdt[7];

kernel-src/include/x86-64/arch/msr.h

@@ -4,6 +4,11 @@
 #include <stdint.h>
 
 #define MSR_IA32APICBASE 0x1B
+#define MSR_PERF_FIXED_CTR2 0x30b
+#define MSR_PERF_FIXED_CTR_CTRL 0x38d
+#define MSR_PERF_GLOBAL_STATUS 0x38e
+#define MSR_PERF_GLOBAL_CTRL 0x38f
+#define MSR_PERF_GLOBAL_OVF_CTRL 0x390
 #define MSR_EFER 0xC0000080
 #define MSR_STAR 0xC0000081
 #define MSR_LSTAR 0xC0000082

kernel-src/include/x86-64/arch/prof.h

@@ -0,0 +1,9 @@
+#ifndef ARCH_PROF_H
+#define ARCH_PROF_H
+
+#include <arch/context.h>
+#include <stdbool.h>
+
+bool arch_profiling_irq(context_t *ctx);
+
+#endif