From 7ff724fe8f709440da9c730fdb8dcbaa4f989ed5 Mon Sep 17 00:00:00 2001
From: Benji Dial <Benji3.141@gmail.com>
Date: Thu, 13 Aug 2020 23:59:14 -0400
Subject: FAT16 directory enumeration, making many functions static, new 'log'
 functions to wrap vga and serial

---
 src/kernel/serial.c | 67 ++++++++++++++++++++++++-----------------------------
 1 file changed, 30 insertions(+), 37 deletions(-)

(limited to 'src/kernel/serial.c')

diff --git a/src/kernel/serial.c b/src/kernel/serial.c
index c92f173..9ca8315 100644
--- a/src/kernel/serial.c
+++ b/src/kernel/serial.c
@@ -48,54 +48,47 @@ enum {
   CLS_READ  = 0x01
 };
 
-bool error;
-#define SERIAL_SPIN_LIMIT 65535
+static const uint16_t ports[] = {
+  CP_1, CP_2, CP_3, CP_4
+};
+
+static bool error[] = {
+  false, false, false, false
+};
 
-bool serr() {
-  return error;
+void reset_error(enum serial_port n) {
+  error[n] = false;
 }
 
 void init_serial() {
-  error = false;
-  outb(CP_1 | CP_INT, 0);
-  outb(CP_1 | CP_LINE, CL_BAUD);
-  outb(CP_1 | CP_DIVLOW, 0x03);//38400
-  outb(CP_1 | CP_DIVHIGH, 0x00);//baud
-  outb(CP_1 | CP_LINE, CL_8BIT);
-  outb(CP_1 | CP_FIFO, 0xc7);//?
+  for (enum serial_port i = COM1; i <= COM4; ++i) {
+    outb(ports[i] | CP_INT, 0);
+    outb(ports[i] | CP_LINE, CL_BAUD);
+    outb(ports[i] | CP_DIVLOW, 0x03);//38400
+    outb(ports[i] | CP_DIVHIGH, 0x00);//baud
+    outb(ports[i] | CP_LINE, CL_8BIT);
+    outb(ports[i] | CP_FIFO, 0xc7);//?
+  }
 }
 
-void sout(char b) {
-  if (error)
+typedef uint16_t serial_spin_t;
+
+void sout(enum serial_port n, uint8_t b) {
+  if (error[n])
     return;
-  uint16_t s = SERIAL_SPIN_LIMIT;
-  while (!(inb(CP_1 | CP_LINE_S) & CLS_WRITE))
-    if (!--s) {
-      error = true;
+  serial_spin_t spinner = -1;
+  while (!(inb(ports[n] | CP_LINE_S) & CLS_WRITE))
+    if (--spinner) {
+      error[n] = true;
       return;
     }
-  outb(CP_1 | CP_DATA, (uint8_t)b);
-}
-
-void soutsz(const char *s) {
-  while (*s)
-    sout(*(s++));
-}
-
-void soutsn(const char *s, uint8_t n) {
-  while (n--)
-    sout(*(s++));
+  outb(ports[n] | CP_DATA, b);
 }
 
-char sin() {
-  if (error)
+uint8_t sin(enum serial_port n) {
+  if (error[n])
     return 0;
-  while (!(inb(CP_1 | CP_LINE_S) & CLS_READ))
+  while (!(inb(ports[n] | CP_LINE_S) & CLS_READ))
     ;//spin
-  return (char)inb(CP_1 | CP_DATA);
-}
-
-void sinsn(char *s, uint8_t n) {
-  while (n--)
-    *(s++) = sin();
+  return inb(ports[n] | CP_DATA);
 }
\ No newline at end of file
-- 
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