// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
+#ifndef __BIOSVAR_H
+#define __BIOSVAR_H
#include "types.h" // u8
#include "farptr.h" // SET_SEG
+#include "config.h" // CONFIG_*
+
+#define PACKED __attribute__((packed))
/****************************************************************
// 30:00
// u8 stack[256];
// 40:00
- u16 port_com1, port_com2, port_com3, port_com4;
- u16 port_lpt1, port_lpt2, port_lpt3;
+ u16 port_com[4];
+ u16 port_lpt[3];
u16 ebda_seg;
// 40:10
u16 equipment_list_flags;
u16 mem_size_kb;
u8 pad2;
u8 ps2_ctrl_flag;
- u16 kbd_flag;
+ u8 kbd_flag0;
+ u8 kbd_flag1;
u8 alt_keypad;
u16 kbd_buf_head;
u16 kbd_buf_tail;
u32 timer_counter;
// 40:70
u8 timer_rollover;
- u8 other4[0x0f];
+ u8 other4[0x04];
+ u8 disk_count;
+ 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;
u32 user_wait_timeout;
// 40:A0
u8 rtc_wait_flag;
-} __attribute__((packed));
+} PACKED;
// BDA floppy_recalibration_status bitdefs
#define FRS_TIMEOUT (1<<7)
#define FMS_DATA_RATE_MASK (0xc0)
// Accessor functions
-#define GET_BDA(var) ({ \
- SET_SEG(ES, 0x0000); \
- GET_VAR(ES, ((struct bios_data_area_s *)0)->var); })
-#define SET_BDA(var, val) do { \
- SET_SEG(ES, 0x0000); \
- SET_VAR(ES, ((struct bios_data_area_s *)0)->var, val); \
- } while (0)
+#define GET_BDA(var) \
+ GET_FARVAR(0x0000, ((struct bios_data_area_s *)0)->var)
+#define SET_BDA(var, val) \
+ SET_FARVAR(0x0000, ((struct bios_data_area_s *)0)->var, (val))
#define CLEARBITS_BDA(var, val) do { \
typeof(((struct bios_data_area_s *)0)->var) __val = GET_BDA(var); \
SET_BDA(var, (__val & ~(val))); \
} while (0)
+/****************************************************************
+ * Hard drive 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;
+
+struct chs_s {
+ u16 heads; // # heads
+ u16 cylinders; // # cylinders
+ u16 spt; // # sectors / track
+};
+
+// DPTE definition
+struct dpte_s {
+ u16 iobase1;
+ u16 iobase2;
+ u8 prefix;
+ u8 unused;
+ u8 irq;
+ u8 blkcount;
+ u8 dma;
+ u8 pio;
+ u16 options;
+ u16 reserved;
+ u8 revision;
+ u8 checksum;
+};
+
+struct ata_channel_s {
+ u8 iface; // ISA or PCI
+ u16 iobase1; // IO Base 1
+ u16 iobase2; // IO Base 2
+ u8 irq; // IRQ
+} PACKED;
+
+struct ata_device_s {
+ u8 type; // Detected type of ata (ata/atapi/none/unknown)
+ u8 device; // Detected type of attached devices (hd/cd/none)
+ u8 removable; // Removable device flag
+ u8 lock; // Locks for removable devices
+ u8 mode; // transfer mode : PIO 16/32 bits - IRQ - ISADMA - PCIDMA
+ u16 blksize; // block size
+
+ u8 translation; // type of translation
+ struct chs_s lchs; // Logical CHS
+ struct chs_s pchs; // Physical CHS
+
+ u32 sectors; // Total sectors count
+} PACKED;
+
+struct ata_s {
+ // ATA channels info
+ struct ata_channel_s channels[CONFIG_MAX_ATA_INTERFACES];
+
+ // ATA devices info
+ struct ata_device_s devices[CONFIG_MAX_ATA_DEVICES];
+ //
+ // map between (bios hd id - 0x80) and ata channels
+ u8 hdcount, hdidmap[CONFIG_MAX_ATA_DEVICES];
+
+ // map between (bios cd id - 0xE0) and ata channels
+ u8 cdcount, cdidmap[CONFIG_MAX_ATA_DEVICES];
+
+ // Buffer for DPTE table
+ struct dpte_s dpte;
+
+ // Count of transferred sectors and bytes
+ u16 trsfsectors;
+ u32 trsfbytes;
+} PACKED;
+
+// ElTorito Device Emulation data
+struct cdemu_s {
+ u8 active;
+ u8 media;
+ u8 emulated_drive;
+ u8 controller_index;
+ u16 device_spec;
+ u32 ilba;
+ u16 buffer_segment;
+ u16 load_segment;
+ u16 sector_count;
+
+ // Virtual device
+ struct chs_s vdevice;
+} PACKED;
+
+
/****************************************************************
* Extended Bios Data Area (EBDA)
****************************************************************/
u8 size;
u8 other1[0x3c];
- // FDPT - Can be splitted in data members if needed
- u8 fdpt0[0x10];
- u8 fdpt1[0x10];
+ struct fdpt_s fdpt0;
+ struct fdpt_s fdpt1;
u8 other2[0xC4];
// ATA Driver data
- //ata_t ata;
+ struct ata_s ata;
-#if BX_ELTORITO_BOOT
// El Torito Emulation data
- cdemu_t cdemu;
-#endif // BX_ELTORITO_BOOT
+ struct cdemu_s cdemu;
};
+// Accessor functions
+#define GET_EBDA(var) \
+ GET_FARVAR(EBDA_SEG, ((struct extended_bios_data_area_s *)0)->var)
+#define SET_EBDA(var, val) \
+ SET_FARVAR(EBDA_SEG, ((struct extended_bios_data_area_s *)0)->var, (val))
+
/****************************************************************
- * Extended Bios Data Area (EBDA)
+ * Initial Program Load (IPL)
+ ****************************************************************/
+
+// XXX - is this a standard, or just a bochs bios thing?
+
+struct ipl_entry_s {
+ u16 type;
+ u16 flags;
+ u32 vector;
+ u32 description;
+ u32 reserved;
+};
+
+struct ipl_s {
+ struct ipl_entry_s table[8];
+ u16 count;
+ u16 sequence;
+ u8 pad[124];
+};
+
+#define IPL_TYPE_FLOPPY 0x01
+#define IPL_TYPE_HARDDISK 0x02
+#define IPL_TYPE_CDROM 0x03
+#define IPL_TYPE_BEV 0x80
+
+// Accessor functions
+#define GET_IPL(var) \
+ GET_FARVAR(IPL_SEG, ((struct ipl_s *)0)->var)
+#define SET_IPL(var, val) \
+ SET_FARVAR(IPL_SEG, ((struct ipl_s *)0)->var, (val))
+
+
+/****************************************************************
+ * Registers saved/restored in romlayout.S
****************************************************************/
#define UREG(ER, R, RH, RL) union { u32 ER; struct { u16 R; u16 R ## _hi; }; struct { u8 RL; u8 RH; u8 R ## _hilo; u8 R ## _hihi; }; }
} __attribute__((packed));
// bregs flags bitdefs
-#define F_CF (1<<9)
+#define F_ZF (1<<6)
+#define F_CF (1<<0)
static inline void
set_cf(struct bregs *regs, int cond)
#define SEG_BIOS 0xf000
#define EBDA_SEG 0x9FC0
+#define IPL_SEG 0x9FF0
#define EBDA_SIZE 1 // In KiB
#define BASE_MEM_IN_K (640 - EBDA_SIZE)
+
+#endif // __BIOSVAR_H
projects / seabios.git / blobdiff