Meta: Move kernel and userland to their own folders.

This is to allow both the kernel and the userland to share certain
header files and to make the folder structure a bit more clear.

1 files changed, 188 insertions, 0 deletions

diff --git a/kernel/drivers/keyboard.c b/kernel/drivers/keyboard.c
new file mode 100644
index 0000000..8c96606
--- /dev/null
+++ b/kernel/drivers/keyboard.c
@@ -0,0 +1,188 @@
+#include <assert.h>
+#include <drivers/keyboard.h>
+#include <errno.h>
+#include <fs/devfs.h>
+#include <fs/fifo.h>
+#include <fs/vfs.h>
+#include <sched/scheduler.h>
+#include <stdint.h>
+
+#define PS2_REG_DATA 0x60
+#define PS2_REG_STATUS 0x64
+#define PS2_REG_COMMAND 0x64
+
+#define PS2_CMD_ENABLE_FIRST_PORT 0xAE // no rsp
+
+#define PS2_CMD_TEST_CONTROLLER 0xAA // has rsp
+
+#define PS2_RSP_TEST_PASSED 0x55
+#define PS2_RSP_TEST_FAILED 0xFC
+
+#define PS2_CMD_SET_SCANCODE 0xF0 // has rsp
+#define PS2_KB_ACK 0xFA
+#define PS2_KB_RESEND 0xFE
+
+#define PS2_CMD_SET_MAKE_RELEASE 0xF8 // has rsp
+
+uint8_t kb_scancodes[3] = {0x43, 0x41, 0x3f};
+
+FIFO_FILE *keyboard_fifo;
+
+uint8_t ascii_table[] = {
+    'e', '\x1B', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', 8,
+    '\t',
+
+    'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p',
+    //	0, // [
+    //	0, // ]
+    //	0,
+    //	0, // ?
+    '[', ']',
+    '\n', // ENTER
+    'C',
+
+    'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l',
+    ';',  // ;
+    '\'', // ;
+    '`',  // ;
+    'D',  // LEFT SHIFT
+    '\\', // ;
+    'z', 'x', 'c', 'v', 'b', 'n', 'm',
+    ',', // ;
+    '.', // ;
+    '/', // ;
+    'U', // ;
+    'U', // ;
+    'U', // ;
+    ' ', // ;
+};
+
+uint8_t capital_ascii_table[] = {
+    'e', '\x1B', '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+', 8,
+    '\t',
+
+    'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P',
+    //	0, // [
+    //	0, // ]
+    //	0,
+    //	0, // ?
+    '{', '}',
+    '\n', // ENTER
+    'C',
+
+    'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L',
+    ':',  // ;
+    '\"', // ;
+    '~',  // ;
+    'D',  // LEFT SHIFT
+    '\\', // ;
+    'Z', 'X', 'C', 'V', 'B', 'N', 'M',
+    '<', // ;
+    '>', // ;
+    '?', // ;
+    'U', // ;
+    'U', // ;
+    'U', // ;
+    ' ', // ;
+};
+
+vfs_inode_t *kb_inode;
+
+uint8_t keyboard_to_ascii(uint16_t key, uint8_t capital) {
+  if ((key & 0xFF) > sizeof(ascii_table))
+    return 'U';
+  if (capital)
+    return capital_ascii_table[key & 0xFF];
+  else
+    return ascii_table[key & 0xFF];
+}
+
+uint8_t is_shift_down = 0;
+uint8_t is_alt_down = 0;
+
+struct KEY_EVENT {
+  char c;
+  uint8_t mode;    // (shift (0 bit)) (alt (1 bit))
+  uint8_t release; // 0 pressed, 1 released
+};
+
+extern process_t *ready_queue;
+__attribute__((interrupt)) void
+int_keyboard(__attribute__((unused)) struct interrupt_frame *frame) {
+  outb(0x20, 0x20);
+  uint16_t c;
+  c = inb(PS2_REG_DATA);
+  int released = 0;
+  if (c & 0x80) {
+    switch ((c & ~(0x80)) & 0xFF) {
+    case 0x2A: // Left shift
+    case 0x36: // Right shift
+      is_shift_down = 0;
+      return;
+    case 0x38:
+      is_alt_down = 0;
+      return;
+    }
+    released = 1;
+  } else {
+    switch (c & 0xFF) {
+    case 0x2A: // Left shift
+    case 0x36: // Right shift
+      is_shift_down = 1;
+      return;
+    case 0x38:
+      is_alt_down = 1;
+      return;
+    }
+    released = 0;
+  }
+  unsigned char a = keyboard_to_ascii((c & ~(0x80)) & 0xFF, is_shift_down);
+  struct KEY_EVENT ev;
+  ev.c = a;
+  ev.release = released;
+  ev.mode = 0;
+  ev.mode |= is_shift_down << 0;
+  ev.mode |= is_alt_down << 1;
+  fifo_object_write((uint8_t *)&ev, 0, sizeof(ev), keyboard_fifo);
+  kb_inode->has_data = keyboard_fifo->has_data;
+}
+
+#define PS2_WAIT_RECV                                                          \
+  {                                                                            \
+    for (;;) {                                                                 \
+      uint8_t status = inb(PS2_REG_STATUS);                                    \
+      if (status & 0x1)                                                        \
+        break;                                                                 \
+    }                                                                          \
+  }
+
+#define PS2_WAIT_SEND                                                          \
+  {                                                                            \
+    for (;;) {                                                                 \
+      uint8_t status = inb(PS2_REG_STATUS);                                    \
+      if (!(status & (0x1 << 1)))                                              \
+        break;                                                                 \
+    }                                                                          \
+  }
+
+void install_keyboard(void) {
+  keyboard_fifo = create_fifo_object();
+  install_handler(int_keyboard, INT_32_INTERRUPT_GATE(0x3), 0x21);
+}
+
+int keyboard_read(uint8_t *buffer, uint64_t offset, uint64_t len,
+                  vfs_fd_t *fd) {
+  (void)offset;
+
+  if (0 == fd->inode->has_data) {
+    return -EAGAIN;
+  }
+  int rc = fifo_object_read(buffer, 0, len, keyboard_fifo);
+  fd->inode->has_data = keyboard_fifo->has_data;
+  return rc;
+}
+
+void add_keyboard(void) {
+  kb_inode = devfs_add_file("/keyboard", keyboard_read, NULL, NULL, 0, 0,
+                            FS_TYPE_CHAR_DEVICE);
+}