From 81df4702c424f91cca5570ab2554d1d4cbae534d Mon Sep 17 00:00:00 2001
From: Benji Dial <benji6283@gmail.com>
Date: Wed, 3 Mar 2021 22:43:17 -0500
Subject: 64kiB kernel area, ps/2 mouse support, signed decimals in knob format

---
 src/kernel/kbd.c | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 78 insertions(+), 6 deletions(-)

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

diff --git a/src/kernel/kbd.c b/src/kernel/kbd.c
index 47894cd..004706f 100644
--- a/src/kernel/kbd.c
+++ b/src/kernel/kbd.c
@@ -21,16 +21,36 @@ enum {
 enum {
   PS2C_READ_CONFIG  = 0x20,
   PS2C_WRITE_CONFIG = 0x60,
+  PS2C_AUX_ENABLE   = 0xa8,
   PS2C_DISABLE      = 0xad,
-  PS2C_ENABLE       = 0xae
+  PS2C_ENABLE       = 0xae,
+  PS2C_SEND_AUX     = 0xd4
 };
 
 enum {
-  PS2S_CODE_READY = 0x01
+  PS2S_CODE_READY = 0x01,
+  PS2S_DONT_SEND  = 0x02,
+  PS2S_FROM_MOUSE = 0x20
 };
 
 enum {
-  PS2G_XT_COMPAT = 0x40
+  PS2G_KBD_IRQ     = 0x01,
+  PS2G_MOUSE_IRQ   = 0x02,
+  PS2G_KBD_OFF     = 0x10,
+  PS2G_MOUSE_OFF   = 0x20,
+  PS2G_XT_COMPAT   = 0x40
+};
+
+enum {
+  MFB_BUTTON_ONE = 0x01,
+  MFB_BUTTON_TWO = 0x02,
+  MFB_BUTTON_MID = 0x04,
+  MFB_X_SIGN     = 0x10,
+  MFB_Y_SIGN     = 0x20
+};
+
+enum {
+  MC_ENABLE_REPORT = 0xf4
 };
 
 static uint32_t n_scantabs;
@@ -55,7 +75,16 @@ void init_kbd() {
   outb(PS2_CMD, PS2C_READ_CONFIG);
   uint8_t config = inb(PS2_DATA);
   outb(PS2_CMD, PS2C_WRITE_CONFIG);
-  outb(PS2_DATA, config | PS2G_XT_COMPAT);
+  outb(PS2_DATA, (config | PS2G_XT_COMPAT | PS2G_MOUSE_IRQ | PS2G_KBD_IRQ) & ~(PS2G_MOUSE_OFF | PS2G_KBD_OFF));
+
+  outb(PS2_CMD, PS2C_SEND_AUX);
+  while (inb(PS2_CMD) & PS2S_DONT_SEND)
+    ;
+  outb(PS2_DATA, MC_ENABLE_REPORT);
+  while (!(inb(PS2_CMD) & PS2S_CODE_READY))
+    ;
+  if (inb(PS2_DATA) != 0xfa)
+    PANIC("didn't get ACK after enabling mouse reporting");
 
   uint32_t layout_len;
   if (!try_get_sz_setting("kbd-layout", scantab_path + SCANTAB_DIR_LEN, LAYOUT_NAME_MAX_LEN, &layout_len))
@@ -107,11 +136,54 @@ static inline uint8_t get_next_code_byte() {
   return cb;
 }
 
+static inline uint8_t get_wait() {
+  for (uint32_t i = 0; i < 1000000; ++i)
+    ;
+  return inb(PS2_DATA);
+}
+
 static enum key_modifiers_t keymods = 0;
 
+bool last_mouse_one = false;
+bool last_mouse_two = false;
+bool last_mouse_mid = false;
+
 enum kbd_isr_result on_kbd_isr() {
-//logf(LOG_INFO, "on_kbd_isr()");
-  while (inb(PS2_CMD) & PS2S_CODE_READY) {
+  uint8_t code;
+  while ((code = inb(PS2_CMD)) & PS2S_CODE_READY) {
+    if (code & PS2S_FROM_MOUSE) {
+      const uint8_t first = get_wait();
+      const uint8_t x = get_wait();
+      const uint8_t y = get_wait();
+
+      if (x || y || (first & (MFB_X_SIGN | MFB_Y_SIGN)))
+        move_mouse_by((first & MFB_Y_SIGN) ? 256 - y : -y,
+                      (first & MFB_X_SIGN) ? x - 256 : x);
+
+      const bool mouse_one = first & MFB_BUTTON_ONE;
+      const bool mouse_two = first & MFB_BUTTON_TWO;
+      const bool mouse_mid = first & MFB_BUTTON_MID;
+
+      if (mouse_one && !last_mouse_one)
+        mouse_button(LEFT, false);
+      if (mouse_two && !last_mouse_two)
+        mouse_button(RIGHT, false);
+      if (mouse_mid && !last_mouse_mid)
+        mouse_button(MIDDLE, false);
+
+      if (!mouse_one && last_mouse_one)
+        mouse_button(LEFT, true);
+      if (!mouse_two && last_mouse_two)
+        mouse_button(RIGHT, true);
+      if (!mouse_mid && last_mouse_mid)
+        mouse_button(MIDDLE, true);
+
+      last_mouse_one = mouse_one;
+      last_mouse_two = mouse_two;
+      last_mouse_mid = mouse_mid;
+      continue;
+    }
+
     last_code_byte = 0;
     uint8_t code[256];
     uint8_t code_i = 0;
-- 
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