// Variable layouts of bios.
//
-// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
+// Copyright (C) 2008-2010 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_*
+#include "disk.h" // struct chs_s
/****************************************************************
- * Bios Data Area (BDA)
+ * Interupt vector table
****************************************************************/
-struct ivec {
- u16 offset;
- u16 seg;
+struct rmode_IVT {
+ struct segoff_s ivec[256];
};
+#define GET_IVT(vector) \
+ GET_FARVAR(SEG_IVT, ((struct rmode_IVT *)0)->ivec[vector])
+#define SET_IVT(vector, segoff) \
+ SET_FARVAR(SEG_IVT, ((struct rmode_IVT *)0)->ivec[vector], segoff)
+
+#define FUNC16(func) ({ \
+ ASSERT32FLAT(); \
+ extern void func (void); \
+ SEGOFF(SEG_BIOS, (u32)func - BUILD_BIOS_ADDR); \
+ })
+
+
+/****************************************************************
+ * 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 other_49[0x7];
+ u8 video_mode;
+ u16 video_cols;
+ u16 video_pagesize;
+ u16 video_pagestart;
// 40:50
- u8 other_50[0x10];
+ u16 cursor_pos[8];
// 40:60
- u8 other_60[0x7];
- u32 jump_cs_ip;
- u8 dummy;
+ 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 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 other_84[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;
u8 floppy_harddisk_info;
// 40:90
u8 floppy_media_state[4];
- u8 floppy_track0;
- u8 floppy_track1;
- u8 kbd_mode;
+ u8 floppy_track[2];
+ u8 kbd_flag2;
u8 kbd_led;
- u32 ptr_user_wait_complete_flag;
+ 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;
} PACKED;
// BDA floppy_recalibration_status bitdefs
/****************************************************************
- * 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
-
- u64 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;
- u8 media;
- u8 emulated_drive;
- u8 controller_index;
- u16 device_spec;
+ struct drive_s *emulated_drive_gf;
u32 ilba;
u16 buffer_segment;
u16 load_segment;
u16 sector_count;
+ u8 active;
+ u8 media;
+ u8 emulated_extdrive;
// Virtual device
- struct chs_s vdevice;
-};
-
-
-/****************************************************************
- * Initial Program Load (IPL)
- ****************************************************************/
-
-struct ipl_entry_s {
- u16 type;
- u16 flags;
- u32 vector;
- u32 description;
+ struct chs_s lchs;
};
-struct ipl_s {
- struct ipl_entry_s table[8];
- u16 count;
- u16 sequence;
- u32 bootorder;
- u8 checkfloppysig;
-};
-
-#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;
u8 checksum;
} PACKED;
+struct usbkeyinfo {
+ union {
+ struct {
+ u8 modifiers;
+ u8 repeatcount;
+ u8 keys[6];
+ };
+ u64 data;
+ };
+};
+
struct extended_bios_data_area_s {
u8 size;
u8 reserved1[0x21];
- u32 far_call_pointer;
+ struct segoff_s far_call_pointer;
u8 mouse_flag1;
u8 mouse_flag2;
u8 mouse_data[0x08];
// 0x5d
u8 other2[0xC4];
- // Physical memory available.
- u32 ram_size;
- u16 e820_count;
- u32 e820_loc;
- u32 pir_loc;
+ // 0x121 - Begin custom storage.
+ u8 ps2ctr;
+ struct usbkeyinfo usbkey_last;
- // ATA Driver data
- struct ata_s ata;
+ int RTCusers;
// El Torito Emulation data
struct cdemu_s cdemu;
- // Initial program load
- struct ipl_s ipl;
-} PACKED;
+ // Buffer for disk DPTE table
+ struct dpte_s dpte;
-// 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))
+ // Locks for removable devices
+ u8 cdrom_locks[CONFIG_MAX_EXTDRIVE];
+ u16 boot_sequence;
-/****************************************************************
- * Registers saved/restored in romlayout.S
- ****************************************************************/
+ /* TSC emulation timekeepers */
+ u64 tsc_8254;
+ int last_tsc_8254;
-#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)
+// The initial size and location of EBDA
+#define EBDA_SIZE_START \
+ DIV_ROUND_UP(sizeof(struct extended_bios_data_area_s), 1024)
+#define EBDA_SEGMENT_START \
+ FLATPTR_TO_SEG(BUILD_LOWRAM_END - EBDA_SIZE_START*1024)
-static inline void
-set_cf(struct bregs *regs, int cond)
+// Accessor functions
+static inline u16 get_ebda_seg(void) {
+ return GET_BDA(ebda_seg);
+}
+static inline struct extended_bios_data_area_s *
+get_ebda_ptr(void)
{
- if (cond)
- regs->flags |= F_CF;
- else
- regs->flags &= ~F_CF;
+ ASSERT32FLAT();
+ return MAKE_FLATPTR(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
+ ****************************************************************/
+
+#if MODE16 == 0 && MODESEGMENT == 1
+// In 32bit segmented mode %cs may not be readable and the code may be
+// relocated. The entry code sets up %gs with a readable segment and
+// the code offset can be determined by get_global_offset().
+#define GLOBAL_SEGREG GS
+static inline u32 __attribute_const get_global_offset(void) {
+ u32 ret;
+ asm(" calll 1f\n"
+ "1:popl %0\n"
+ " subl $1b, %0"
+ : "=r"(ret));
+ return ret;
+}
+#else
+#define GLOBAL_SEGREG CS
+static inline u32 __attribute_const get_global_offset(void) {
+ return 0;
+}
+#endif
+static inline u16 get_global_seg(void) {
+ return GET_SEG(GLOBAL_SEGREG);
+}
+#define GET_GLOBAL(var) \
+ GET_VAR(GLOBAL_SEGREG, *(typeof(&(var)))((void*)&(var) \
+ + get_global_offset()))
+#define SET_GLOBAL(var, val) do { \
+ ASSERT32FLAT(); \
+ (var) = (val); \
+ } while (0)
+#if MODESEGMENT
+#define GLOBALFLAT2GLOBAL(var) ((typeof(var))((void*)(var) - BUILD_BIOS_ADDR))
+#else
+#define GLOBALFLAT2GLOBAL(var) (var)
+#endif
+// Access a "flat" pointer known to point to the f-segment.
+#define GET_GLOBALFLAT(var) GET_GLOBAL(*GLOBALFLAT2GLOBAL(&(var)))
/****************************************************************
u8 feature1, feature2, feature3, feature4, feature5;
} PACKED;
-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 DIV_ROUND_UP(sizeof(struct extended_bios_data_area_s), 1024)
-#define BASE_MEM_IN_K (640 - EBDA_SIZE)
+extern struct bios_config_table_s BIOS_CONFIG_TABLE __aligned(1);
#endif // __BIOSVAR_H
projects / seabios.git / blobdiff