//
// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
//
-// This file may be distributed under the terms of the GNU GPLv3 license.
+// This file may be distributed under the terms of the GNU LGPLv3 license.
#ifndef __BIOSVAR_H
#define __BIOSVAR_H
#include "types.h" // u8
-#include "farptr.h" // SET_SEG
+#include "farptr.h" // GET_FARVAR
#include "config.h" // CONFIG_*
-#define PACKED __attribute__((packed))
-
/****************************************************************
- * Bios Data Area (BDA)
+ * Interupt vector table
****************************************************************/
struct ivec {
- u16 offset;
- u16 seg;
+ union {
+ struct {
+ u16 offset;
+ u16 seg;
+ };
+ u32 segoff;
+ };
};
+#define SET_IVT(vector, seg, off) \
+ SET_FARVAR(SEG_IVT, ((struct ivec *)0)[vector].segoff, ((seg) << 16) | (off))
+
+
+/****************************************************************
+ * Bios Data Area (BDA)
+ ****************************************************************/
+
struct bios_data_area_s {
- // 00:00
- struct ivec ivecs[256];
- // 30:00
-// u8 stack[256];
// 40:00
u16 port_com[4];
u16 port_lpt[3];
u8 floppy_motor_counter;
u8 floppy_last_status;
u8 floppy_return_status[7];
- u8 other1[0x7];
+ u8 video_mode;
+ u16 video_cols;
+ u16 video_pagesize;
+ u16 video_pagestart;
// 40:50
- u8 other2[0x1c];
- // 40:6c
+ u16 cursor_pos[8];
+ // 40:60
+ u16 cursor_type;
+ u8 video_page;
+ u16 crtc_address;
+ u8 video_msr;
+ u8 video_pal;
+ u16 jump_ip;
+ u16 jump_cs;
+ u8 other_6b;
u32 timer_counter;
// 40:70
u8 timer_rollover;
- u8 other4[0x04];
- u8 disk_count;
+ u8 break_flag;
+ u16 soft_reset_flag;
+ u8 disk_last_status;
+ u8 hdcount;
u8 disk_control_byte;
u8 port_disk;
u8 lpt_timeout[4];
// 40:80
u16 kbd_buf_start_offset;
u16 kbd_buf_end_offset;
- u8 other5[7];
+ u8 video_rows;
+ u16 char_height;
+ u8 video_ctl;
+ u8 video_switches;
+ u8 modeset_ctl;
+ u8 dcc_index;
u8 floppy_last_data_rate;
- u8 other6[3];
+ u8 disk_status_controller;
+ u8 disk_error_controller;
+ u8 disk_interrupt_flag;
u8 floppy_harddisk_info;
// 40:90
u8 floppy_media_state[4];
// Accessor functions
#define GET_BDA(var) \
- GET_FARVAR(0x0000, ((struct bios_data_area_s *)0)->var)
+ GET_FARVAR(SEG_BDA, ((struct bios_data_area_s *)0)->var)
#define SET_BDA(var, val) \
- SET_FARVAR(0x0000, ((struct bios_data_area_s *)0)->var, (val))
+ SET_FARVAR(SEG_BDA, ((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))); \
/****************************************************************
- * Hard drive info
+ * Extended Bios Data Area (EBDA)
****************************************************************/
-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;
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;
u16 sector_count;
// Virtual device
- struct chs_s vdevice;
-} PACKED;
-
+ u16 heads;
+ u16 cylinders;
+ u16 spt;
+};
-/****************************************************************
- * Extended Bios Data Area (EBDA)
- ****************************************************************/
+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 extended_bios_data_area_s {
u8 size;
- u8 other1[0x3c];
-
- struct fdpt_s fdpt0;
- struct fdpt_s fdpt1;
-
+ u8 reserved1[0x21];
+ u32 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];
- // ATA Driver data
- struct ata_s ata;
+ // 0x121 - Begin custom storage.
+ u8 ps2ctr;
// El Torito Emulation data
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))
-
-/****************************************************************
- * Initial Program Load (IPL)
- ****************************************************************/
+ // Count of transferred sectors and bytes to/from disk
+ u16 sector_count;
-// XXX - is this a standard, or just a bochs bios thing?
+ // Buffer for disk DPTE table
+ struct dpte_s dpte;
-struct ipl_entry_s {
- u16 type;
- u16 flags;
- u32 vector;
- u32 description;
- u32 reserved;
-};
+ // Locks for removable devices
+ u8 cdrom_locks[CONFIG_MAX_ATA_DEVICES];
-struct ipl_s {
- struct ipl_entry_s table[8];
- u16 count;
- u16 sequence;
- u8 pad[124];
-};
+ u16 boot_sequence;
-#define IPL_TYPE_FLOPPY 0x01
-#define IPL_TYPE_HARDDISK 0x02
-#define IPL_TYPE_CDROM 0x03
-#define IPL_TYPE_BEV 0x80
+ // Stack space available for code that needs it.
+ u8 extra_stack[512] __aligned(8);
+} PACKED;
// 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))
+static inline u16 get_ebda_seg() {
+ return GET_BDA(ebda_seg);
+}
+static inline struct extended_bios_data_area_s *
+get_ebda_ptr()
+{
+ extern void *__force_link_error__get_ebda_ptr_only_in_32bit();
+ if (MODE16)
+ return __force_link_error__get_ebda_ptr_only_in_32bit();
+ return (void*)MAKE_FARPTR(get_ebda_seg(), 0);
+}
+#define GET_EBDA2(eseg, var) \
+ GET_FARVAR(eseg, ((struct extended_bios_data_area_s *)0)->var)
+#define SET_EBDA2(eseg, var, val) \
+ SET_FARVAR(eseg, ((struct extended_bios_data_area_s *)0)->var, (val))
+#define GET_EBDA(var) \
+ GET_EBDA2(get_ebda_seg(), var)
+#define SET_EBDA(var, val) \
+ SET_EBDA2(get_ebda_seg(), var, (val))
+
+#define EBDA_OFFSET_TOP_STACK \
+ offsetof(struct extended_bios_data_area_s, extra_stack[ \
+ FIELD_SIZEOF(struct extended_bios_data_area_s \
+ , extra_stack)])
/****************************************************************
- * Registers saved/restored in romlayout.S
+ * Global variables
****************************************************************/
-#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; }; }
-
-struct bregs {
- u16 ds;
- u16 es;
- UREG(edi, di, di_hi, di_lo);
- UREG(esi, si, si_hi, si_lo);
- UREG(ebp, bp, bp_hi, bp_lo);
- UREG(esp, sp, sp_hi, sp_lo);
- UREG(ebx, bx, bh, bl);
- UREG(edx, dx, dh, dl);
- UREG(ecx, cx, ch, cl);
- UREG(eax, ax, ah, al);
- u16 ip;
- u16 cs;
- u16 flags;
-} __attribute__((packed));
-
-// bregs flags bitdefs
-#define F_ZF (1<<6)
-#define F_CF (1<<0)
-
-static inline void
-set_cf(struct bregs *regs, int cond)
-{
- if (cond)
- regs->flags |= F_CF;
- else
- regs->flags &= ~F_CF;
-}
+#define GET_GLOBAL(var) \
+ GET_VAR(CS, (var))
+#if MODE16
+extern void __force_link_error__set_global_only_in_32bit();
+#define SET_GLOBAL(var, val) do { \
+ (void)(val); \
+ __force_link_error__set_global_only_in_32bit(); \
+ } while (0)
+#else
+#define SET_GLOBAL(var, val) \
+ do { (var) = (val); } while (0)
+#endif
/****************************************************************
****************************************************************/
struct bios_config_table_s {
- // XXX
- u8 x;
-};
+ u16 size;
+ u8 model;
+ u8 submodel;
+ u8 biosrev;
+ u8 feature1, feature2, feature3, feature4, feature5;
+} PACKED;
extern struct bios_config_table_s BIOS_CONFIG_TABLE;
-
-/****************************************************************
- * Memory layout info
- ****************************************************************/
-
-#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