move old kernel code (for now) into kernel/old, trying to get long mode

1 files changed, 81 insertions, 0 deletions

diff --git a/kernel/old/include/x86/pit.h b/kernel/old/include/x86/pit.h
new file mode 100644
index 0000000..0c54539
--- /dev/null
+++ b/kernel/old/include/x86/pit.h
@@ -0,0 +1,81 @@
+/*
+** @file    pit.h
+**
+** @author  Warren R. Carithers
+** @author	K. Reek
+**
+** Definitions of constants and macros for the
+** Intel 8254 Programmable Interval Timer
+**
+*/
+
+#ifndef X86PIT_H_
+#define X86PIT_H_
+
+/*
+** Hardware timer (Intel 8254 Programmable Interval Timer)
+**
+** Control word layout:
+**
+**   Bit     7   6 | 5   4 | 3   2   1 | 0
+**   Field  SC1 SC0|RW1 RW0|M2  M1  M0 |BCD
+**
+** SC  - select counter
+** RW  - read/write
+** M   - mode
+** BCD - binary or BCD counter
+*/
+/* Frequency settings */
+#define PIT_DEFAULT_TICKS_PER_SECOND 18 // actually 18.2065Hz
+#define PIT_DEFAULT_MS_PER_TICK (1000 / PIT_DEFAULT_TICKS_PER_SECOND)
+#define PIT_FREQ 1193182 // clock cycles/sec
+
+/* Port assignments */
+#define PIT_BASE_PORT 0x40 // I/O port for the timer
+#define PIT_0_PORT (PIT_BASE_PORT)
+#define PIT_1_PORT (PIT_BASE_PORT + 1)
+#define PIT_2_PORT (PIT_BASE_PORT + 2)
+#define PIT_CONTROL_PORT (PIT_BASE_PORT + 3)
+
+/* BCD field */
+#define PIT_USE_DECIMAL 0x00 // 16-bit binary counter (default)
+#define PIT_USE_BCD 0x01 // BCD counter
+
+/* Timer modes */
+#define PIT_MODE_0 0x00 // int on terminal count
+#define PIT_MODE_1 0x02 // one-shot
+#define PIT_MODE_2 0x04 // divide-by-N
+#define PIT_MODE_3 0x06 // square-wave
+#define PIT_MODE_4 0x08 // software strobe
+#define PIT_MODE_5 0x0a // hardware strobe
+
+/* Timer 0 settings */
+#define PIT_0_SELECT 0x00 // select timer 0
+#define PIT_0_LOAD 0x30 // load LSB, then MSB
+#define PIT_0_NDIV PIT_MODE_2 // divide-by-N counter
+#define PIT_0_SQUARE PIT_MODE_3 // square-wave mode
+#define PIT_0_ENDSIGNAL 0x00 // assert OUT at end of count
+
+/* Timer 1 settings */
+#define PIT_1_SELECT 0x40 // select timer 1
+#define PIT_1_READ 0x30 // read/load LSB then MSB
+#define PIT_1_RATE 0x06 // square-wave, for USART
+
+/* Timer 2 settings */
+#define PIT_2_SELECT 0x80 // select timer 1
+#define PIT_2_READ 0x30 // read/load LSB then MSB
+#define PIT_2_RATE 0x06 // square-wave, for USART
+
+/* Timer read-back */
+
+#define PIT_READBACK 0xc0 // perform a read-back
+#define PIT_RB_NOT_COUNT 0x20 // don't latch the count
+#define PIT_RB_NOT_STATUS 0x10 // don't latch the status
+#define PIT_RB_CHAN_2 0x08 // read back channel 2
+#define PIT_RB_CHAN_1 0x04 // read back channel 1
+#define PIT_RB_CHAN_0 0x02 // read back channel 0
+#define PIT_RB_ACCESS_MASK 0x30 // access mode field
+#define PIT_RB_OP_MASK 0x0e // oper mode field
+#define PIT_RB_BCD_MASK 0x01 // BCD mode field
+
+#endif