keyboard input

1 files changed, 108 insertions, 3 deletions

diff --git a/kernel/interrupts.cpp b/kernel/interrupts.cpp
index 1a95f22..cd57c4f 100644
--- a/kernel/interrupts.cpp
+++ b/kernel/interrupts.cpp
@@ -1,4 +1,6 @@
 #include <hilbert/kernel/terminal.hpp>
+#include <hilbert/kernel/input.hpp>
+#include <hilbert/kernel/panic.hpp>
 
 using namespace hilbert::kernel;
 
@@ -34,7 +36,7 @@ struct [[gnu::packed]] exception_info_t {
 
 extern exception_info_t exception_info;
 
-const char *exception_types[] = {
+static const char *exception_types[] = {
   "division error",
   "",
   "non-maskable interrupt",
@@ -53,7 +55,7 @@ const char *exception_types[] = {
   ""
 };
 
-const char *flag_names[] = {
+static const char *flag_names[] = {
   " cf",
   "",
   " pf",
@@ -72,7 +74,7 @@ const char *flag_names[] = {
   " md"
 };
 
-void print_line(const char *r1, const char *r2, uint64_t r1v, uint64_t r2v) {
+static void print_line(const char *r1, const char *r2, uint64_t r1v, uint64_t r2v) {
   terminal::put_string_sz("\n  ");
   terminal::put_string_sz(r1);
   terminal::put_string_sz(": 0x");
@@ -123,3 +125,106 @@ extern "C" [[noreturn]] void print_exception() {
     asm ("hlt");
 
 }
+
+static uint32_t current_flags = 0;
+
+#define SETBIT(field, bit, cond) \
+  field = (cond) ? (field | (bit)) : (field & ~(bit));
+
+static void got_key(uint32_t key) {
+
+  input::key_queue->insert(current_flags | key);
+
+  if (key == (input::BREAK | 0x77))
+    current_flags ^= input::NUM_LOCK;
+
+  else if (key == (input::BREAK | 0x58))
+    current_flags ^= input::CAPS_LOCK;
+
+  else if ((key & 0xff) == 0xa7)
+    SETBIT(current_flags, input::RIGHT_WIN, !(key & input::BREAK))
+
+  else if ((key & 0xff) == 0x9f)
+    SETBIT(current_flags, input::LEFT_WIN, !(key & input::BREAK))
+
+  else if ((key & 0xff) == 0x91)
+    SETBIT(current_flags, input::RIGHT_ALT, !(key & input::BREAK))
+
+  else if ((key & 0xff) == 0x11)
+    SETBIT(current_flags, input::LEFT_ALT, !(key & input::BREAK))
+
+  else if ((key & 0xff) == 0x94)
+    SETBIT(current_flags, input::RIGHT_CTRL, !(key & input::BREAK))
+
+  else if ((key & 0xff) == 0x14)
+    SETBIT(current_flags, input::LEFT_CTRL, !(key & input::BREAK))
+
+  else if ((key & 0xff) == 0x59)
+    SETBIT(current_flags, input::RIGHT_SHIFT, !(key & input::BREAK))
+
+  else if ((key & 0xff) == 0x12)
+    SETBIT(current_flags, input::LEFT_SHIFT, !(key & input::BREAK))
+
+}
+
+static uint8_t key_so_far[8];
+uint8_t key_so_far_len = 0;
+
+extern "C" void on_keyboard_interrupt(uint8_t byte) {
+
+  key_so_far[key_so_far_len++] = byte;
+
+  if (key_so_far_len == 1) {
+    if (byte != 0xe0 && byte != 0xe1 && byte != 0xf0) {
+      got_key(byte);
+      key_so_far_len = 0;
+    }
+  }
+
+  else if (key_so_far_len == 2) {
+    if (key_so_far[0] == 0xe0 && byte != 0xf0 && byte != 0x12) {
+      got_key(byte | 0x80);
+      key_so_far_len = 0;
+    }
+    else if (key_so_far[0] == 0xf0) {
+      got_key(input::BREAK | byte);
+      key_so_far_len = 0;
+    }
+  }
+
+  else if (key_so_far_len == 3) {
+    if (key_so_far[0] == 0xe0 && key_so_far[1] == 0xf0 && byte != 0x7c) {
+      got_key(input::BREAK | byte | 0x80);
+      key_so_far_len = 0;
+    }
+  }
+
+  else if (key_so_far_len == 4) {
+    if (key_so_far[0] == 0xe0 && key_so_far[1] == 0x12 &&
+        key_so_far[2] == 0xe0 && byte == 0x7c) {
+      got_key(0xe0);
+      key_so_far_len = 0;
+    }
+  }
+
+  else if (key_so_far_len == 6) {
+    if (key_so_far[0] == 0xe0 && key_so_far[1] == 0xf0 &&
+        key_so_far[2] == 0x7c && key_so_far[3] == 0xe0 &&
+        key_so_far[4] == 0xf0 && byte == 0x12) {
+      got_key(input::BREAK | 0xe0);
+      key_so_far_len = 0;
+    }
+  }
+
+  else if (key_so_far_len == 8) {
+    if (key_so_far[0] == 0xe1 && key_so_far[1] == 0x14 &&
+        key_so_far[2] == 0x77 && key_so_far[3] == 0xe1 &&
+        key_so_far[2] == 0xf0 && key_so_far[3] == 0x14 &&
+        key_so_far[4] == 0xf0 && byte == 0x77) {
+      got_key(0xe1);
+      got_key(input::BREAK | 0xe1);
+    }
+    key_so_far_len = 0;
+  }
+
+}