rtc timestamp, knob rand, random terminal color

doc/ints.txt

@@ -57,6 +57,7 @@ table 1:
  find unread ipc   | 0x16 | sending task    |                |                |              |              |
  wait ipc read     | 0x17 |                 | reading task   |                |              |              |
  is task running   | 0x18 | boolean         | task handle    |                |              |              |
+ get timestamp     | 0x19 | secs since 2000 |                |                |              |              |
 
 
 table 2:

fs-skel/user/default.rc

@@ -1,3 +1 @@
 set _path bin/
-set _color_fg 10
-set _color_bg 61

makefile

@@ -53,7 +53,8 @@ out/kernel.bin: obj/kernel/drive.ko  obj/kernel/fat.ko    obj/kernel/ide.ko  \
                 obj/kernel/panic.ko  obj/kernel/pci.ko    obj/kernel/elf.ko  \
                 obj/kernel/serial.ko obj/kernel/task.ko   obj/kernel/util.ko \
                 obj/kernel/window.ko obj/kernel/isrs.kao  obj/kernel/kbd.ko  \
-                obj/kernel/pmap.ko   obj/kernel/paging.ko obj/kernel/dump.ko
+                obj/kernel/pmap.ko   obj/kernel/paging.ko obj/kernel/dump.ko \
+                obj/kernel/cmos.ko
 	mkdir -p out
 	ld -T src/kernel/elf-link.ld $^ -o obj/kernel.elf
 	objcopy -O binary obj/kernel.elf out/kernel.bin
@@ -80,7 +81,7 @@ obj/c.rto: obj/runtimes/c/pcrt.ao
 obj/cpp.rto:
 	#TODO
 
-obj/knob.so: obj/knob/file.o  obj/knob/format.o \
+obj/knob.so: obj/knob/file.o  obj/knob/format.o obj/knob/rand.o \
              obj/knob/heap.o  obj/knob/ipc.o    obj/knob/task.o \
              obj/knob/block.o obj/knob/key.o    obj/knob/panic.o
 	ld ${partlink} $^ -o $@

src/kernel/cmos.c

@@ -0,0 +1,34 @@
+#include "cmos.h"
+#include "util.h"
+
+static inline uint8_t read_cmos(uint8_t reg) {
+  outb(0x0070, reg);
+  return inb(0x0071);
+}
+
+//The idea of reading until you get the same value twice, and checking the status register
+//  is from the OSDev Wiki page at <https://wiki.osdev.org/CMOS#The_Real-Time_Clock>.
+struct rtc_time get_rtc_time() {
+  uint8_t prev_sec = -1;
+  struct rtc_time ret;
+get_sec:
+  while (read_cmos(0x0a) & 0x80)
+    ;//spin while rtc is being updated
+  ret.seconds      = read_cmos(0x00);
+  if (ret.seconds != prev_sec) {
+    prev_sec = ret.seconds;
+    goto get_sec;
+  }
+  ret.minutes      = read_cmos(0x02);
+  ret.hours        = read_cmos(0x04);
+  if (ret.hours & 0x80) {
+    ret.hours -= 0x80 - 12;
+    if (ret.hours == 24)
+      ret.hours = 0;
+  }
+  ret.day_of_week  = read_cmos(0x06);
+  ret.day_of_month = read_cmos(0x07);
+  ret.month        = read_cmos(0x08);
+  ret.year         = read_cmos(0x09);
+  return ret;
+}

src/kernel/cmos.h

@@ -0,0 +1,18 @@
+#ifndef CMOS_H
+#define CMOS_H
+
+#include <stdint.h>
+
+struct rtc_time {
+  uint8_t seconds;
+  uint8_t minutes;
+  uint8_t hours;
+  uint8_t day_of_week;
+  uint8_t day_of_month;
+  uint8_t month;
+  uint8_t year;
+};
+
+struct rtc_time get_rtc_time();
+
+#endif

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

src/kernel/isrs.asm

@@ -25,7 +25,7 @@ extern exception_halt
 extern pf_check_stack
 extern dump
 
-n_syscalls equ 0x19
+n_syscalls equ 0x1a
 
 ;section .bss
 ;_debug_is_start_task resb 1

src/kernel/main.c

@@ -4,16 +4,17 @@
 #include "window.h"
 #include "panic.h"
 #include "boot.h"
+#include "cmos.h"
+#include "pmap.h"
+#include "task.h"
 #include "util.h"
+#include "elf.h"
 #include "fat.h"
 #include "ide.h"
 #include "idt.h"
-#include "pmap.h"
-#include "task.h"
-#include "pci.h"
-#include "elf.h"
-#include "log.h"
 #include "kbd.h"
+#include "log.h"
+#include "pci.h"
 
 void _start_user_mode() __attribute__ ((noreturn));
 

src/user/highway/line.c

@@ -17,12 +17,12 @@ static inline uint8_t hex_to_int(char ch) {
 }
 
 void ensure_color() {
-  const struct no_null_sn *fg = get_var((struct no_null_sn){.data = "_color_fg", .length = 9});
+  const struct no_null_sn *color = get_var((struct no_null_sn){.data = "_color", .length = 6});
-  const struct no_null_sn *bg = get_var((struct no_null_sn){.data = "_color_bg", .length = 9});
+  //fgbg
-  if (fg && bg)
+  if (color)
     term_set_color(
-      (hex_to_int(fg->data[0]) << 4) | hex_to_int(fg->data[1]),
+      (hex_to_int(color->data[0]) << 4) | hex_to_int(color->data[1]),
-      (hex_to_int(bg->data[0]) << 4) | hex_to_int(bg->data[1])
+      (hex_to_int(color->data[2]) << 4) | hex_to_int(color->data[3])
     );
 }
 
@@ -100,13 +100,19 @@ void run_line(const char *original_line) {
     term_clear();
     term_paint();
   }
+  else if (blockequ(line, "color", 6)) {
+    new_color();
+    ensure_color();
+    term_paint();
+  }
   else if (blockequ(line, "help", 5)) {
     term_add_sz("Highway is a command shell for Portland OS. It includes variable support and a couple of pseudo-commands. Variables are addressed by surrounding with \"$\". The following list shows each of the pseudo-commands.\n\n"
                 "  source FILE\t"   "run each command in FILE\n"
-                "  clear\t\t\t"     "clear the screen\n"
-                "  echo STRING\t"   "print STRING\n"
                 "  set VAR VALUE\t" "set $VAR$ to VALUE\n"
+                "  color\t\t\t"     "new color scheme\n"
+                "  clear\t\t\t"     "clear the screen\n"
                 "  vars\t\t\t"      "dump variables\n"
+                "  echo STRING\t"   "print STRING\n"
                 "  quit\t\t\t"      "exit highway\n"
                 "  help\t\t\t"      "show this\n");
     term_paint();

src/user/highway/main.c

@@ -5,12 +5,10 @@
 
 #include "cmds.h"
 #include "line.h"
+#include "vars.h"
 
 void main(const char *arg) {
-//syslogf("   this task: 0x%2h", this_task);
+  new_color();
-//syslogf("  stdio task: 0x%2h", stdio_task);
-//syslogf("calling task: 0x%2h", calling_task);
-
   source(*arg ? arg : "user/default.rc");
   ensure_color();
 

src/user/highway/vars.c

@@ -3,6 +3,7 @@
 #include <knob/format.h>
 #include <knob/block.h>
 #include <knob/heap.h>
+#include <knob/rand.h>
 
 #include <pland/pcrt.h>
 
@@ -81,3 +82,23 @@ void dump_vars() {
     term_paint();
   }
 }
+
+static const char hex_digits[] = "0123456789abcdef";
+static char color[] = {'1', '0', '.', '.'};
+
+static const struct no_null_sn color_name = {
+  .data = "_color",
+  .length = 6
+};
+
+static const struct no_null_sn color_value = {
+  .data = color,
+  .length = 4
+};
+
+void new_color() {
+  const uint8_t bg = gen_rand() % 0x30 + 0x38;
+  color[2] = hex_digits[bg >> 4];
+  color[3] = hex_digits[bg & 0xf];
+  set_var(color_name, color_value);
+}

src/user/highway/vars.h

@@ -13,5 +13,6 @@ const struct no_null_sn *get_var(struct no_null_sn name) __attribute__ ((pure));
 void del_var(struct no_null_sn name);
 
 void dump_vars();
+void new_color();
 
 #endif

src/user/include/knob/rand.h

@@ -0,0 +1,8 @@
+#ifndef RAND_H
+#define RAND_H
+
+#include <stdint.h>
+
+uint32_t gen_rand();
+
+#endif

src/user/include/pland/syscall.h

@@ -43,7 +43,8 @@ enum _scn {
   _SCN_WAIT_ANY_IPC_SENT,
   _SCN_FIND_UNREAD_IPC,
   _SCN_WAIT_IPC_READ,
-  _SCN_IS_TASK_RUNNING
+  _SCN_IS_TASK_RUNNING,
+  _SCN_GET_TIMESTAMP
 };
 
 static inline uint32_t _sc0(enum _scn eax) {
@@ -228,4 +229,8 @@ static inline bool _is_task_running(_task_handle_t handle) {
   return (bool)_sc1(_SCN_IS_TASK_RUNNING, handle);
 }
 
+static inline uint32_t _get_timestamp() {
+  return _sc0(_SCN_GET_TIMESTAMP);
+}
+
 #endif

src/user/knob/rand.c

@@ -0,0 +1,19 @@
+#include <pland/syscall.h>
+#include <pland/pcrt.h>
+
+#include <stdint.h>
+
+static uint32_t r;
+
+static void seed_rand() {
+  r = _get_timestamp();
+}
+
+BEFORE_MAIN(seed_rand)
+
+uint32_t gen_rand() {
+  r ^= r << 13;
+  r ^= r >> 17;
+  r ^= r << 5;
+  return r;
+}