rtc timestamp, knob rand, random terminal color

1 files changed, 18 insertions, 1 deletions

diff --git a/src/kernel/idt.c b/src/kernel/idt.c
index 9b3ba96..99284ac 100644
--- a/src/kernel/idt.c
+++ b/src/kernel/idt.c
@@ -2,6 +2,7 @@
 #include "window.h"
 #include "drive.h"
 #include "panic.h"
+#include "cmos.h"
 #include "pmap.h"
 #include "task.h"
 #include "util.h"
@@ -141,6 +142,21 @@ uint32_t sc_is_task_running(uint32_t handle) {
   return tasks[handle - 1].page_directory ? 1 : 0;
 }
 
+static const uint16_t days_into_four_years_per_month[] = {
+     0,      31,      60,      91,      121,      152,      182,      213,      244,      274,      305,      335,
+   366,  366+31,  366+59,  366+90,  366+120,  366+151,  366+181,  366+212,  366+243,  366+273,  366+304,  366+334,
+   731,  731+31,  731+59,  731+90,  731+120,  731+151,  731+181,  731+212,  731+243,  731+273,  731+304,  731+334,
+  1096, 1096+31, 1096+59, 1096+90, 1096+120, 1096+151, 1096+181, 1096+212, 1096+243, 1096+273, 1096+304, 1096+334
+};
+
+//gregorian, assumes year is in 2001 to 2099
+uint32_t sc_get_timestamp() {
+  const struct rtc_time time = get_rtc_time();
+  const uint32_t secs_into_month = time.seconds + time.minutes * 60 + time.hours * 3600 + (time.day_of_month - 1) * 86400;
+  const uint32_t days_to_month_into_four_years = days_into_four_years_per_month[time.month + (time.year % 4) * 12 - 1];
+  return secs_into_month + days_to_month_into_four_years * 86400 + (time.year / 4) * (365 * 4 + 1) * 86400;
+}
+
 void const *syscall_table[] = {
   &sc_open_file,
   &sc_close_file,
@@ -166,7 +182,8 @@ void const *syscall_table[] = {
   &sc_wait_any_ipc_sent,
   &find_unread_ipc,
   &sc_wait_ipc_read,
-  &sc_is_task_running
+  &sc_is_task_running,
+  &sc_get_timestamp
 };
 
 //these aren't really void ()'s, but gcc complains if we take an address of a void, so we give it a type