// 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" // 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];
u16 crtc_address;
u8 video_msr;
u8 video_pal;
- u16 jump_ip;
- u16 jump_cs;
+ struct segoff_s jump;
u8 other_6b;
u32 timer_counter;
// 40:70
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];
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
u8 checksum;
};
+// ElTorito Device Emulation data
+struct cdemu_s {
+ 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 lchs;
+};
+
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];
// 0x121 - Begin custom storage.
u8 ps2ctr;
+ struct usbkeyinfo usbkey_last;
- u8 cdemu_active;
+ int RTCusers;
- // Count of transferred sectors and bytes to/from disk
- u16 sector_count;
+ // El Torito Emulation data
+ struct cdemu_s cdemu;
// Buffer for disk DPTE table
struct dpte_s dpte;
// Locks for removable devices
- u8 cdrom_locks[CONFIG_MAX_ATA_DEVICES];
+ u8 cdrom_locks[CONFIG_MAX_EXTDRIVE];
u16 boot_sequence;
- // Resume stack
- u8 resume_stack[128] __aligned(8);
+ /* TSC emulation timekeepers */
+ u64 tsc_8254;
+ int last_tsc_8254;
+
+ // Stack space available for code that needs it.
+ u8 extra_stack[512] __aligned(8);
} PACKED;
+// 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)
+
// Accessor functions
-#define GET_EBDA(var) \
- GET_FARVAR(GET_BDA(ebda_seg), ((struct extended_bios_data_area_s *)0)->var)
-#define SET_EBDA(var, val) \
- SET_FARVAR(GET_BDA(ebda_seg), ((struct extended_bios_data_area_s *)0)->var, (val))
+static inline u16 get_ebda_seg(void) {
+ return GET_BDA(ebda_seg);
+}
static inline struct extended_bios_data_area_s *
-get_ebda_ptr()
+get_ebda_ptr(void)
{
- 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_BDA(ebda_seg), 0);
+ 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
****************************************************************/
-#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(); \
+#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 SET_GLOBAL(var, val) \
- do { (var) = (val); } while (0)
+#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;
+extern struct bios_config_table_s BIOS_CONFIG_TABLE __aligned(1);
#endif // __BIOSVAR_H
projects / seabios.git / blobdiff