From 89e5c998288f537c7b1f7d62515802a0578a5a2e Mon Sep 17 00:00:00 2001
From: Matheus <matheusuky@gmail.com>
Date: Mon, 17 Oct 2022 11:08:22 -0300
Subject: [PATCH] timekeeper: initial implementation

---
 src/arch/x86_64/include/arch/timekeeper.h | 11 ++++++
 src/arch/x86_64/main.c                    |  6 ++-
 src/arch/x86_64/timekeeper.c              | 47 +++++++++++++++++++++++
 3 files changed, 62 insertions(+), 2 deletions(-)
 create mode 100644 src/arch/x86_64/include/arch/timekeeper.h
 create mode 100644 src/arch/x86_64/timekeeper.c

diff --git a/src/arch/x86_64/include/arch/timekeeper.h b/src/arch/x86_64/include/arch/timekeeper.h
new file mode 100644
index 00000000..967fc24a
--- /dev/null
+++ b/src/arch/x86_64/include/arch/timekeeper.h
@@ -0,0 +1,11 @@
+#ifndef _TIMEKEEPER_H_INCLUDE
+#define _TIMEKEEPER_H_INCLUDE
+
+#include <time.h>
+
+struct timespec arch_timekeeper_gettime();
+struct timespec arch_timekeeper_gettimefromboot();
+
+void arch_timekeeper_init();
+
+#endif
diff --git a/src/arch/x86_64/main.c b/src/arch/x86_64/main.c
index bc0848d1..a164cd57 100644
--- a/src/arch/x86_64/main.c
+++ b/src/arch/x86_64/main.c
@@ -18,6 +18,7 @@
 #include <arch/smp.h>
 #include <kernel/timer.h>
 #include <kernel/keyboard.h>
+#include <arch/timekeeper.h>
 
 void kmain(){
 
@@ -29,8 +30,7 @@ void kmain(){
 
 	idt_bspinit();
 	
-	pmm_init();
-	
+	pmm_init();	
 	
 	arch_mmu_init();
 	
@@ -48,6 +48,8 @@ void kmain(){
 
 	hpet_init();
 
+	arch_timekeeper_init();
+
 	timer_init();
 
 	vfs_init();
diff --git a/src/arch/x86_64/timekeeper.c b/src/arch/x86_64/timekeeper.c
new file mode 100644
index 00000000..e1cb9d66
--- /dev/null
+++ b/src/arch/x86_64/timekeeper.c
@@ -0,0 +1,47 @@
+#include <arch/timekeeper.h>
+#include <limine.h>
+#include <arch/panic.h>
+#include <arch/hpet.h>
+
+static time_t bootunixtime;
+static time_t timerticksperus;
+static time_t timerusatboot;
+
+static volatile struct limine_boot_time_request lim_boottime = {
+	.id = LIMINE_BOOT_TIME_REQUEST,
+	.revision = 0,
+};
+
+struct timespec arch_timekeeper_gettimefromboot(){
+	struct timespec time;
+
+	time_t timercurrentus = hpet_get_counter() / timerticksperus - timerusatboot;
+
+	time.tv_sec = timercurrentus / US_IN_SECS;
+	time.tv_nsec = (timercurrentus % US_IN_SECS) * NS_IN_US;
+
+	return time;
+
+}
+
+struct timespec arch_timekeeper_gettime(){
+	struct timespec time;
+	struct timespec timefromboot = arch_timekeeper_gettimefromboot();
+	time.tv_sec = bootunixtime + timefromboot.tv_sec;
+	time.tv_nsec = timefromboot.tv_nsec;
+
+	return time;
+
+}
+
+void arch_timekeeper_init(){
+	
+	if(!lim_boottime.response)
+		_panic("No limine boot time response\n", 0);
+	
+	bootunixtime = lim_boottime.response->boot_time;
+
+	timerticksperus  = hpet_get_ticksperus();
+	
+	timerusatboot = hpet_get_counter() / timerticksperus;
+}