//
// 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
/****************************************************************
- * 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 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];
/****************************************************************
- * 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 {
- u16 iobase1; // IO Base 1
- u16 iobase2; // IO Base 2
- u16 pci_bdf;
- 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;
u16 sector_count;
// Virtual device
- struct chs_s vdevice;
-};
-
-
-/****************************************************************
- * Initial Program Load (IPL)
- ****************************************************************/
-
-struct ipl_entry_s {
- u16 type;
- u16 flags;
- u32 vector;
- char *description;
-};
-
-struct ipl_s {
- struct ipl_entry_s table[8];
- u16 count;
- u16 sequence;
- u32 bootorder;
- u8 checkfloppysig;
+ 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;
// 0x121 - Begin custom storage.
u8 ps2ctr;
- // Physical memory available.
- u32 ram_size; // Amount of continuous ram under 4Gig
- u64 ram_size_over4G; // Amount of continuous ram >4Gig
-
- // ATA Driver data
- struct ata_s ata;
-
// El Torito Emulation data
struct cdemu_s cdemu;
- // Initial program load
- struct ipl_s ipl;
+ // Count of transferred sectors and bytes to/from disk
+ u16 sector_count;
+
+ // Buffer for disk DPTE table
+ struct dpte_s dpte;
- // Resume stack
- u8 resume_stack[128] __aligned(8);
+ // Locks for removable devices
+ u8 cdrom_locks[CONFIG_MAX_ATA_DEVICES];
+
+ u16 boot_sequence;
+
+ // Stack space available for code that needs it.
+ u8 extra_stack[512] __aligned(8);
} PACKED;
// 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() {
+ 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_BDA(ebda_seg), 0);
+ 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)])
/****************************************************************
GET_VAR(CS, (var))
#if MODE16
extern void __force_link_error__set_global_only_in_32bit();
-#define SET_GLOBAL(var, val) \
- __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)
projects / seabios.git / blobdiff