#include "farptr.h" // SET_SEG
#include "config.h" // CONFIG_*
-#define PACKED __attribute__((packed))
-
/****************************************************************
* Bios Data Area (BDA)
u8 floppy_motor_counter;
u8 floppy_last_status;
u8 floppy_return_status[7];
- u8 other1[0x7];
+ u8 other_49[0x7];
// 40:50
- u8 other2[0x1c];
- // 40:6c
+ u8 other_50[0x10];
+ // 40:60
+ u8 other_60[0x7];
+ u32 jump_cs_ip;
+ u8 dummy;
u32 timer_counter;
// 40:70
u8 timer_rollover;
- u8 other4[0x04];
+ u8 break_flag;
+ u16 soft_reset_flag;
+ u8 disk_last_status;
u8 disk_count;
u8 disk_control_byte;
u8 port_disk;
// 40:80
u16 kbd_buf_start_offset;
u16 kbd_buf_end_offset;
- u8 other5[7];
+ u8 other_84[7];
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
****************************************************************/
-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 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)
struct chs_s lchs; // Logical CHS
struct chs_s pchs; // Physical CHS
- u32 sectors; // Total sectors count
-} PACKED;
+ u64 sectors; // Total sectors count
+};
struct ata_s {
// ATA channels info
// 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];
+ // 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;
- u32 trsfbytes;
-} PACKED;
+};
// ElTorito Device Emulation data
struct cdemu_s {
// Virtual device
struct chs_s vdevice;
-} PACKED;
-
-
-/****************************************************************
- * Extended Bios Data Area (EBDA)
- ****************************************************************/
-
-struct extended_bios_data_area_s {
- u8 size;
- u8 other1[0x3c];
-
- struct fdpt_s fdpt0;
- struct fdpt_s fdpt1;
-
- u8 other2[0xC4];
-
- // ATA Driver data
- struct ata_s ata;
-
- // 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)
****************************************************************/
-// 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];
+ u32 bootorder;
+ u8 checkfloppysig;
};
#define IPL_TYPE_FLOPPY 0x01
#define IPL_TYPE_CDROM 0x03
#define IPL_TYPE_BEV 0x80
+
+/****************************************************************
+ * 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 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];
+
+ // Physical memory available.
+ u32 ram_size;
+ u16 e820_count;
+ u32 e820_loc;
+
+ // ATA Driver data
+ struct ata_s ata;
+
+ // El Torito Emulation data
+ struct cdemu_s cdemu;
+
+ // Initial program load
+ struct ipl_s ipl;
+} 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))
+#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))
/****************************************************************
#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(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);
u16 ip;
u16 cs;
u16 flags;
-} __attribute__((packed));
+} PACKED;
// bregs flags bitdefs
#define F_ZF (1<<6)
****************************************************************/
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;
****************************************************************/
#define SEG_BIOS 0xf000
+#define SEG_EBDA 0x9fc0
+#define SEG_BDA 0x0000
-#define EBDA_SEG 0x9FC0
-#define IPL_SEG 0x9FF0
-#define EBDA_SIZE 1 // In KiB
-#define BASE_MEM_IN_K (640 - EBDA_SIZE)
+#define EBDA_SIZE DIV_ROUND_UP(sizeof(struct extended_bios_data_area_s), 1024)
+#define BASE_MEM_IN_K (640 - EBDA_SIZE)
#endif // __BIOSVAR_H
projects / seabios.git / blobdiff