1 files changed, 119 insertions, 0 deletions
diff --git a/kernel/old/include/bootstrap.h b/kernel/old/include/bootstrap.h
new file mode 100644
index 0000000..6c6dfcc
--- /dev/null
+++ b/kernel/old/include/bootstrap.h
@@ -0,0 +1,119 @@
+/*
+** SCCS ID:	@(#)bootstrap.h	2.4	1/22/25
+**
+** @file	bootstrap.h
+**
+** @author	K. Reek
+** @author	Warren R. Carithers, Garrett C. Smith
+**
+** Addresses where various stuff goes in memory.
+*/
+
+#ifndef BOOTSTRAP_H_
+#define BOOTSTRAP_H_
+
+/*
+** The boot device
+*/
+#define BDEV_FLOPPY 0x00
+#define BDEV_USB 0x80 /* hard drive */
+
+#define BDEV BDEV_USB /* default */
+
+/*
+** Bootstrap definitions
+*/
+#define BOOT_SEG 0x07c0 /* 07c0:0000 */
+#define BOOT_DISP 0x0000
+#define BOOT_ADDR ((BOOT_SEG << 4) + BOOT_DISP)
+
+#define PART2_DISP 0x0200 /* 07c0:0200 */
+#define PART2_ADDR ((BOOT_SEG << 4) + PART2_DISP)
+
+#define SECTOR_SIZE 0x200 /* 512 bytes */
+
+/* Note: this assumes the bootstrap is two sectors long! */
+#define BOOT_SIZE (SECTOR_SIZE + SECTOR_SIZE)
+
+#define OFFSET_LIMIT (0x10000 - SECTOR_SIZE)
+
+#define BOOT_SP_DISP 0x4000 /* stack pointer 07c0:4000, or 0xbc00 */
+#define BOOT_SP_ADDR ((BOOT_SEG << 4) + BOOT_SP_DISP)
+
+#define SECTOR1_END (BOOT_ADDR + SECTOR_SIZE)
+#define SECTOR2_END (BOOT_ADDR + BOOT_SIZE)
+
+// location of the user blob data
+// (three halfwords of data)
+#define USER_BLOB_DATA (SECTOR2_END - 12)
+
+/*
+** The target program itself
+*/
+#define TARGET_SEG 0x00001000 /* 1000:0000 */
+#define TARGET_ADDR 0x00010000 /* and upward */
+#define TARGET_STACK 0x00010000 /* and downward */
+
+/*
+** The Global Descriptor Table (0000:0500 - 0000:2500)
+*/
+#define GDT_SEG 0x00000050
+#define GDT_ADDR 0x00000500
+
+/* segment register values */
+#define GDT_LINEAR 0x0008 /* All of memory, R/W */
+#define GDT_CODE 0x0010 /* All of memory, R/E */
+#define GDT_DATA 0x0018 /* All of memory, R/W */
+#define GDT_STACK 0x0020 /* All of memory, R/W */
+
+/*
+** The Interrupt Descriptor Table (0000:2500 - 0000:2D00)
+*/
+#define IDT_SEG 0x00000250
+#define IDT_ADDR 0x00002500
+
+/*
+** Additional I/O ports used by the bootstrap code
+*/
+
+// keyboard controller
+#define KBD_DATA 0x60
+#define KBD_CMD 0x64
+#define KBD_STAT 0x64
+
+// status register bits
+#define KBD_OBSTAT 0x01
+#define KBD_IBSTAT 0x02
+#define KBD_SYSFLAG 0x04
+#define KBD_CMDDAT 0x08
+
+// commands
+#define KBD_P1_DISABLE 0xad
+#define KBD_P1_ENABLE 0xae
+#define KBD_RD_OPORT 0xd0
+#define KBD_WT_OPORT 0xd1
+
+#ifdef ASM_SRC
+
+// segment descriptor macros for use in assembly source files
+// layout:
+//     .word    lower 16 bits of limit
+//     .word    lower 16 bits of base
+//     .byte    middle 8 bits of base
+//     .byte    type byte
+//     .byte    granularity byte
+//     .byte    upper 8 bits of base
+// we use 4K units, so we ignore the lower 12 bits of the limit
+#define SEGNULL .word 0, 0, 0, 0
+
+#define SEGMENT(base, limit, dpl, type)                              \
+	.word(((limit) >> 12) & 0xffff);                                 \
+	.word((base) & 0xffff);                                          \
+	.byte(((base) >> 16) & 0xff);                                    \
+	.byte(SEG_PRESENT | (dpl) | SEG_NON_SYSTEM | (type));            \
+	.byte(SEG_GRAN_4KBYTE | SEG_DB_32BIT | (((limit) >> 28) & 0xf)); \
+	.byte(((base) >> 24) & 0xff)
+
+#endif /* ASM_SRC */
+
+#endif