//
// 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_*
/****************************************************************
- * 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[0x10];
+ u16 cursor_pos[8];
// 40:60
- u8 other3[0x7];
- u32 jump_cs_ip;
- u8 dummy;
+ 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 break_flag;
u16 soft_reset_flag;
u8 disk_last_status;
- u8 disk_count;
+ 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 disk_status_controller;
u8 disk_error_controller;
/****************************************************************
- * Hard drive info
+ * Extended Bios Data Area (EBDA)
****************************************************************/
-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
-};
-
-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
-};
-
-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/cd id and ata channels
- u8 hdcount, cdcount;
- u8 idmap[2][CONFIG_MAX_ATA_DEVICES];
-
- // Buffer for DPTE table
- struct dpte_s dpte;
-
- // Count of transferred sectors and bytes
- u16 trsfsectors;
-};
-
// ElTorito Device Emulation data
struct cdemu_s {
u8 active;
u16 sector_count;
// Virtual device
- struct chs_s vdevice;
-};
-
-
-/****************************************************************
- * Initial Program Load (IPL)
- ****************************************************************/
-
-struct ipl_entry_s {
- u16 type;
- u16 flags;
- u32 vector;
- u32 description;
-};
-
-struct ipl_s {
- struct ipl_entry_s table[8];
- u16 count;
- u16 sequence;
- u16 bootfirst;
+ u16 heads;
+ u16 cylinders;
+ u16 spt;
};
-#define IPL_TYPE_FLOPPY 0x01
-#define IPL_TYPE_HARDDISK 0x02
-#define IPL_TYPE_CDROM 0x03
-#define IPL_TYPE_BEV 0x80
-
-
-/****************************************************************
- * Extended Bios Data Area (EBDA)
- ****************************************************************/
-
struct fdpt_s {
u16 cylinders;
u8 heads;
// 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;
- // Initial program load
- struct ipl_s ipl;
-} PACKED;
+ // Count of transferred sectors and bytes to/from disk
+ u16 sector_count;
-// Accessor functions
-#define GET_EBDA(var) \
- GET_FARVAR(SEG_EBDA, ((struct extended_bios_data_area_s *)0)->var)
-#define SET_EBDA(var, val) \
- SET_FARVAR(SEG_EBDA, ((struct extended_bios_data_area_s *)0)->var, (val))
+ // Buffer for disk DPTE table
+ struct dpte_s dpte;
+ // Locks for removable devices
+ u8 cdrom_locks[CONFIG_MAX_ATA_DEVICES];
-/****************************************************************
- * Registers saved/restored in romlayout.S
- ****************************************************************/
+ u16 boot_sequence;
-#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; }; }
-
-// Layout of registers passed in to irq handlers. Note that this
-// layout corresponds to code in romlayout.S - don't change it here
-// without also updating the assembler code.
-struct bregs {
- u16 ds;
- u16 es;
- UREG(edi, di, di_hi, di_lo);
- UREG(esi, si, si_hi, si_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;
+ // Stack space available for code that needs it.
+ u8 extra_stack[512] __aligned(8);
} PACKED;
-// bregs flags bitdefs
-#define F_ZF (1<<6)
-#define F_CF (1<<0)
-
-static inline void
-set_cf(struct bregs *regs, int cond)
+// Accessor functions
+static inline u16 get_ebda_seg() {
+ return GET_BDA(ebda_seg);
+}
+static inline struct extended_bios_data_area_s *
+get_ebda_ptr()
{
- if (cond)
- regs->flags |= F_CF;
- else
- regs->flags &= ~F_CF;
+ 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)])
+
+
+/****************************************************************
+ * Global variables
+ ****************************************************************/
+
+#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
/****************************************************************
extern struct bios_config_table_s BIOS_CONFIG_TABLE;
-
-/****************************************************************
- * Memory layout info
- ****************************************************************/
-
-#define SEG_BIOS 0xf000
-#define SEG_EBDA 0x9fc0
-#define SEG_BDA 0x0000
-
-#define EBDA_SIZE 1 // In KiB
-#define BASE_MEM_IN_K (640 - EBDA_SIZE)
-
#endif // __BIOSVAR_H
projects / seabios.git / blobdiff