Move standard bda type info from biosvar.h to std/bda.h.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

2 files changed, 175 insertions, 0 deletions

diff --git a/src/std/bda.h b/src/std/bda.h
new file mode 100644
index 0000000..948bdbf
--- /dev/null
+++ b/src/std/bda.h
@@ -0,0 +1,159 @@
+// BIOS Data Area (and similar) definitions
+#ifndef __BDA_H
+#define __BDA_H
+
+#include "disk.h" // struct fdpt_s
+#include "types.h" // u8
+
+
+/****************************************************************
+ * Interupt vector table
+ ****************************************************************/
+
+struct rmode_IVT {
+    struct segoff_s ivec[256];
+};
+
+
+/****************************************************************
+ * Bios Data Area (BDA)
+ ****************************************************************/
+
+struct bios_data_area_s {
+    // 40:00
+    u16 port_com[4];
+    u16 port_lpt[3];
+    u16 ebda_seg;
+    // 40:10
+    u16 equipment_list_flags;
+    u8 pad1;
+    u16 mem_size_kb;
+    u8 pad2;
+    u8 ps2_ctrl_flag;
+    u8 kbd_flag0;
+    u8 kbd_flag1;
+    u8 alt_keypad;
+    u16 kbd_buf_head;
+    u16 kbd_buf_tail;
+    // 40:1e
+    u8 kbd_buf[32];
+    u8 floppy_recalibration_status;
+    u8 floppy_motor_status;
+    // 40:40
+    u8 floppy_motor_counter;
+    u8 floppy_last_status;
+    u8 floppy_return_status[7];
+    u8 video_mode;
+    u16 video_cols;
+    u16 video_pagesize;
+    u16 video_pagestart;
+    // 40:50
+    u16 cursor_pos[8];
+    // 40:60
+    u16 cursor_type;
+    u8 video_page;
+    u16 crtc_address;
+    u8 video_msr;
+    u8 video_pal;
+    struct segoff_s jump;
+    u8 other_6b;
+    u32 timer_counter;
+    // 40:70
+    u8 timer_rollover;
+    u8 break_flag;
+    u16 soft_reset_flag;
+    u8 disk_last_status;
+    u8 hdcount;
+    u8 disk_control_byte;
+    u8 port_disk;
+    u8 lpt_timeout[4];
+    u8 com_timeout[4];
+    // 40:80
+    u16 kbd_buf_start_offset;
+    u16 kbd_buf_end_offset;
+    u8 video_rows;
+    u16 char_height;
+    u8 video_ctl;
+    u8 video_switches;
+    u8 modeset_ctl;
+    u8 dcc_index;
+    u8 floppy_last_data_rate;
+    u8 disk_status_controller;
+    u8 disk_error_controller;
+    u8 disk_interrupt_flag;
+    u8 floppy_harddisk_info;
+    // 40:90
+    u8 floppy_media_state[4];
+    u8 floppy_track[2];
+    u8 kbd_flag2;
+    u8 kbd_led;
+    struct segoff_s user_wait_complete_flag;
+    u32 user_wait_timeout;
+    // 40:A0
+    u8 rtc_wait_flag;
+    u8 other_a1[7];
+    struct segoff_s video_savetable;
+    u8 other_ac[4];
+    // 40:B0
+    u8 other_b0[9];
+    u8 vbe_flag;
+    u16 vbe_mode;
+    u8 other_bc[4];
+    // 40:C0
+    u8 other_c0[4*16];
+} PACKED;
+
+// BDA floppy_recalibration_status bitdefs
+#define FRS_IRQ (1<<7)
+
+// BDA rtc_wait_flag bitdefs
+#define RWS_WAIT_PENDING (1<<0)
+#define RWS_WAIT_ELAPSED (1<<7)
+
+// BDA floppy_media_state bitdefs
+#define FMS_DRIVE_STATE_MASK        (0x07)
+#define FMS_MEDIA_DRIVE_ESTABLISHED (1<<4)
+#define FMS_DOUBLE_STEPPING         (1<<5)
+#define FMS_DATA_RATE_MASK          (0xc0)
+
+// Limit of BDA timer_counter field
+#define TICKS_PER_DAY 1573040
+
+
+/****************************************************************
+ * Extended Bios Data Area (EBDA)
+ ****************************************************************/
+
+struct extended_bios_data_area_s {
+    u8 size;
+    u8 reserved1[0x21];
+    struct segoff_s far_call_pointer;
+    u8 mouse_flag1;
+    u8 mouse_flag2;
+    u8 mouse_data[0x08];
+    // 0x30
+    u8 other1[0x0d];
+
+    // 0x3d
+    struct fdpt_s fdpt[2];
+
+    // 0x5d
+    u8 other2[0xC4];
+
+    // 0x121 - Begin custom storage.
+} PACKED;
+
+
+/****************************************************************
+ * Bios Config Table
+ ****************************************************************/
+
+struct bios_config_table_s {
+    u16 size;
+    u8 model;
+    u8 submodel;
+    u8 biosrev;
+    u8 feature1, feature2, feature3, feature4, feature5;
+} PACKED;
+
+#endif // bda.h
diff --git a/src/std/disk.h b/src/std/disk.h
index c111e07..b2576d9 100644
--- a/src/std/disk.h
+++ b/src/std/disk.h
@@ -81,6 +81,22 @@ struct int13dpt_s {
     };
 } PACKED;
 
+// Floppy info
+struct fdpt_s {
+    u16 cylinders;
+    u8 heads;
+    u8 a0h_signature;
+    u8 phys_sectors;
+    u16 precompensation;
+    u8 reserved;
+    u8 drive_control_byte;
+    u16 phys_cylinders;
+    u8 phys_heads;
+    u16 landing_zone;
+    u8 sectors;
+    u8 checksum;
+} PACKED;
+
 // Floppy "Disk Base Table"
 struct floppy_dbt_s {
     u8 specify1;