;++
;
; Module name
;
; su.asm
;
; Author
;
; Thomas Parslow (tomp) Mar-1-90
;
; Description
;
; Static data for Startup module for the 386 NT OS loader. The gdt
; idt, and double fault tss are statically defined here. Also most
; of the zero init static data is defined here because the SU module
; must have a zero length .bss section.
;
;
;--
.386p
SU_DATAMODULE equ 1
include su.inc
include memmap.inc
_DATA SEGMENT PARA USE16 PUBLIC 'DATA'
;
; Global Descriptor Table
;
; Note, the SuCode and SuData segments must have limits of 64k in
; order for the mode switch code to work.
;
public _Beginx86Relocation
public _GDT
_Beginx86Relocation equ $
_GDT equ $
;;;
;;; Lim 0-15, Base0-15,Base 16-23, LimAcc,
;;;
;
; Selector 00h - Null selector - unsused
;
GDTDesc <00000h, 00000h, 000h, 000h, 000h, 000h>
;
; Selector 08h KeCodeSelector - kernel code segment : FLAT 4gig limit
;
GDTDesc <0ffffh, 00000h, 000h, 09ah, 0cfh, 000h>
;
; Selector 10h - KeDataSelector - kernel data segment : FLAT 4gig limit
;
GDTDesc <0ffffh, 00000h, 000h, 092h, 0cfh, 000h>
;
; Selector 18h - UsCodeSelector - User code segment : FLAT 2gig limit
;
GDTDesc <0ffffh, 00000h, 000h, 0fah, 0cfh, 000h>
;
; Selector 20h - UsDataSelector - User data segment : FLAT 2gig limit
;
GDTDesc <0ffffh, 00000h, 000h, 0f2h, 0cfh, 000h>
;
; Selector 28h - TSS_Selector - Kernels TSS
;
GDTDesc <EndTssKernel - _TssKernel - 1, offset _TEXT:_TssKernel, \
002h, 089h, 000h, 000h> ; TSS
;
; Selector 30h - PCR_Selector - Master Boot Processor's PCR segment
; This is actually edited later in BlSetupForNt in order to
; point to a page located at a high virtual address.
;
GDTDesc <01h, 00000h, 000h, 092h, 0c0h, 000h>
;
; Selector 38h - TEP_Selector - Thread Environment
;
GDTDesc <0fffh, 00000h, 000h, 0f3h, 040h, 000h>
;
; Selector 40 - BDA_SAelector - Bios Data Area near-clone
;
GDTDesc <0ffffh, 00400h, 000h, 0f2h, 000h, 000h>
;
; Selector 48h - LdtDescriptor - used to load an ldt
; (Gets set at Ldt set and process switch by the kernel)
;
GDTDesc <00000h, 00000h, 000h, 000h, 000h, 000h>
;
; Selector 50h - DblFltTskSelector - Double Fault TSS
;
GDTDesc <EndTssDblFault32 - _TssDblFault32 - 1, offset _TEXT:_TssDblFault32, \
002h, 089h, 000h, 000h> ;
;
; Selector 58h - SuCodeSelector - Startup module's code segment
;
GDTDesc <0ffffh, 00000h, 002h, 09ah, 000h, 000h>
;
; Selector 60h - SuDataSelector - Startup module's data segment
;
GDTDesc <0ffffh, offset _TEXT:DGROUP, 002h, 092h, 000h, 000h>
;
; Selector 68h - VideoSelector - Video display buffer
;
GDTDesc <03fffh, 08000h, 00bh, 092h, 000h, 000h>
;
; Selector 70h - GDT_AliasSelector - GDT Alias Selector
;
GDTDesc <EndGDT - _GDT - 1, 7000h, 0ffh, 092h, 000h,0ffh>
; Debug selectors : CURRENTLY NOT USED
GDTDesc <0ffffh, 00000h, 040h, 09ah, 000h, 080h> ; 78 Debug Code
GDTDesc <0ffffh, 00000h, 040h, 092h, 000h, 080h> ; 80 Debug Data
GDTDesc <00000h, 00000h, 000h, 092h, 000h, 000h> ; 88 Debug Use
GDTDesc <0ffffh, 00000h, 007h, 092h, 000h, 000h> ; 90 Memory Descriptor List
DEFINED_GDT_ENTRIES equ ($ - _GDT) / size GDTDesc
dq ((1024 / size GDTDesc) - DEFINED_GDT_ENTRIES) DUP(0)
EndGDT equ $
GDT_SIZE equ (EndGDT - _GDT)
;;
;; Interrupt Descriptor Table
;;
public _IDT
align 16
_IDT equ $
TrapDesc <offset Trap0, KeCodeSelector, 8f00h, 0>
TrapDesc <offset Trap1, SuCodeSelector, 8f00h, 0>
TrapDesc <offset Trap2, SuCodeSelector, 8f00h, 0>
TrapDesc <offset Trap3, SuCodeSelector, 8f00h, 0>
TrapDesc <offset Trap4, SuCodeSelector, 8f00h, 0>
TrapDesc <offset Trap5, SuCodeSelector, 8f00h, 0>
TrapDesc <offset Trap6, SuCodeSelector, 8f00h, 0>
TrapDesc <offset Trap7, SuCodeSelector, 8f00h, 0>
TrapDesc <offset Trap8, SuCodeSelector, 8f00h, 0>
;TrapDesc <offset Trap8, DblFltTskSelector,8500h, 0>
TrapDesc <offset Trap9, SuCodeSelector, 8f00h, 0>
TrapDesc <offset TrapA, SuCodeSelector, 8f00h, 0>
TrapDesc <offset TrapB, SuCodeSelector, 8f00h, 0>
TrapDesc <offset TrapC, SuCodeSelector, 8f00h, 0>
TrapDesc <offset TrapD, SuCodeSelector, 8f00h, 0>
TrapDesc <offset TrapE, SuCodeSelector, 8f00h, 0>
TrapDesc <offset TrapF, SuCodeSelector, 8f00h, 0>
DEFINED_IDT_ENTRIES equ ($ - _IDT) / size TrapDesc
dq (IDT_ENTRIES - DEFINED_IDT_ENTRIES) DUP(0)
EndIDT equ $
public _Endx86Relocation
_Endx86Relocation equ $
;
; disk-base table. We copy it from the ROM to here so we can patch the
; last sector number. This lets us access both 5.25" and 3.5" drives.
;
Public _DiskBaseTable
_DiskBaseTable equ $
SpecifyBytes dw 0
WaitTime db 0
SectorLength db 0
LastSector db 0
SecGapLength db 0
DataTransfer db 0
TrackGapLength db 0
DataValue db 0
HeadSettle db 0
StartupTime db 0
Public _RomDiskBasePointer
_RomDiskBasePointer dd 0
;
; Enhanced Disk Drive Spec. Disk Address Packet
;
Public _EddsAddressPacket
_EddsAddressPacket equ $
PacketSize db 10h
Reserved1 db 0
Blocks2Xfer dw 0
XferBuf dd 0
LBALow dd 0
LBAHigh dd 0
;
; Task State Segment for Double Fault Handler
;
Public _TssDblFault
align 16
_TssDblFault equ $
dw 0 ;link
dw offset _DATA:DblFaultStack
dw SuDataSelector
dd 0 ; ring1 ss:sp
dd 0 ; ring2 ss:sp
dw offset _TEXT:Trap8
dw 0 ; flags
dw 0 ; ax
dw 0 ; cx
dw 0 ; dx
dw 0 ; bx
dw offset _DATA:DblFaultStack ; sp
dw 0 ; bp
dw 0 ; si
dw 0 ; di
dw SuDataSelector ; es
dw SuCodeSelector ; cs
dw SuDataSelector ; ss
dw SuDataSelector ; ds
dw 0 ; ldt selector
dw 0
EndTssDblFault equ $
_TssDblFault32 equ $
dd 0 ;link
dd offset _DATA:DblFaultStack
dd SuDataSelector
dd 0 ; ring1 esp
dd 0 ; ring1 ss
dd 0 ; ring2 esp
dd 0 ; ring2 ss
dd PD_PHYSICAL_ADDRESS
dd offset _TEXT:Trap8
dd 0 ; eflags
dd 0 ; eax
dd 0 ; ecx
dd 0 ; edx
dd 0 ; ebx
dd offset _DATA:DblFaultStack ; sp
dd 0 ; bp
dd 0 ; si
dd 0 ; di
dd SuDataSelector ; es
dd SuCodeSelector ; cs
dd SuDataSelector ; ss
dd SuDataSelector ; ds
dd 0 ;fs
dd 0 ;gs
dd 0 ; ldt selector
dd 0 ; i/o map
dd 0 ;
dd 0 ;
EndTssDblFault32 equ $
;
; Stack for Double Fault Handler Task
;
public _FileStart
_FileStart dd 0
align 4
public DblFaultStack
dw 50 DUP(0)
DblFaultStack equ $
;
; Note that we need at least 2k of real-mode stack because some EISA BIOS
; routines require it.
;
align 4
public SuStack
public _SuStackBegin
_SuStackBegin equ $
db 2048 DUP (0)
SuStack equ $
align 16
public _TssKernel
_TssKernel dw 60 DUP(0)
EndTssKernel equ $
align 4
public _GDTregister
_GDTregister dw EndGDT - _GDT - 1
dw (SYSTEM_PAGE_PA and 0ffffh) + offset DGROUP:_GDT
dw (SYSTEM_PAGE_PA SHR 16) and 0ffh
align 4
public _IDTregister
_IDTregister dw EndIDT - _IDT - 1
dw (SYSTEM_PAGE_PA and 0ffffh) + offset DGROUP:_IDT
dw (SYSTEM_PAGE_PA SHR 16) and 0ffh
;
; We load the idtr from the this fword .
;
public _IDTregisterZero
_IDTregisterZero dw 0ffffh
dd 0
;
; We save the base of the real mode data segment here so we
; can use it later in calculations of the linear address of
; the start of DGROUP.
;
public saveDS
saveDS dw 0
;
; When ever we enter the debugger we set this variable to
; on so we can tell if we've faulted in the debugger when
; we get an exception.
;
public _InDebugger
_InDebugger dw 0
; We save SP here when we get an exception in the debugging
; version of the SU module. If we get an exception in the
; debugger, we use this value to reset the stack to point to
; the base of the original exception/break-point stack frame.
;
public SaveSP
SaveSP dw 0
;
; NetPcRomEntry is the address of the entry point exported by the
; NetPC ROM.
;
public _NetPcRomEntry
_NetPcRomEntry dd 0
;
; BOOT CONTEXT RECORD
;
;
; Export Entry Table
;
extrn RebootProcessor:near
extrn GetSector:near
extrn GetEddsSector:near
extrn GetKey:near
extrn GetCounter:near
extrn Reboot:near
extrn DetectHardware:near
extrn HardwareCursor:near
extrn GetDateTime:near
extrn ComPort:near
extrn GetStallCount:near
extrn InitializeDisplayForNt:near
extrn GetMemoryDescriptor:near
extrn GetElToritoStatus:near
extrn GetExtendedInt13Params:near
extrn NetPcRomServices:near
extrn BiosRedirectService:near
SU_LOAD_ADDRESS equ 20000h
; FsContext
;
;
public _FsContext
align 4
_FsContext FsContextRecord <0>
;
; Memory Descriptor Table
; The Memory Descriptor Table begins at 7000:0000 and grows upward.
; Note that this is 64k above the start of the OS Loader Heap and
; 64k below the start of the OS Loader Stack. This is ok, since the
; x86 Arc Emulation will have converted all of this information into
; Arc Memory Descriptors before the OS Loader is initialized.
;
align 4
public _MemoryDescriptorList
_MemoryDescriptorList dw 0
dw 7000h
;
; This is called the External Services Table by the OS loader
;
;**
; NOTE WELL
; The offsets of entries in this table must match its twin
; in startup\i386\sudata.asm, and the structure in boot\inc\bldrx86.h
;**
align 4
public _ExportEntryTable
_ExportEntryTable equ $
dw offset _TEXT:RebootProcessor
dw SU_LOAD_ADDRESS SHR 16
dw offset _TEXT:GetSector
dw SU_LOAD_ADDRESS SHR 16
dw offset _TEXT:GetKey
dw SU_LOAD_ADDRESS SHR 16
dw offset _TEXT:GetCounter
dw SU_LOAD_ADDRESS SHR 16
dw offset _TEXT:Reboot
dw SU_LOAD_ADDRESS SHR 16
dw offset _TEXT:DetectHardware
dw SU_LOAD_ADDRESS SHR 16
dw offset _TEXT:HardwareCursor
dw SU_LOAD_ADDRESS SHR 16
dw offset _TEXT:GetDateTime
dw SU_LOAD_ADDRESS SHR 16
dw offset _TEXT:ComPort
dw SU_LOAD_ADDRESS SHR 16
dw offset _TEXT:GetStallCount
dw SU_LOAD_ADDRESS SHR 16
dw offset _TEXT:InitializeDisplayForNt
dw SU_LOAD_ADDRESS SHR 16
dw offset _TEXT:GetMemoryDescriptor
dw SU_LOAD_ADDRESS SHR 16
dw offset _TEXT:GetEddsSector
dw SU_LOAD_ADDRESS SHR 16
dw offset _TEXT:GetElToritoStatus
dw SU_LOAD_ADDRESS SHR 16
dw offset _TEXT:GetExtendedInt13Params
dw SU_LOAD_ADDRESS SHR 16
dw offset _TEXT:NetPcRomServices
dw SU_LOAD_ADDRESS SHR 16
dw 0 ; null slot for
dw 0 ; apmattemptreconnect
dw offset _TEXT:BiosRedirectService
dw SU_LOAD_ADDRESS SHR 16
dd 0
;**
; See note above
;**
align 4
Public _BootRecord
_BootRecord dw offset _TEXT:_FsContext
dw SU_LOAD_ADDRESS SHR 16
dw offset _TEXT:_ExportEntryTable
dw SU_LOAD_ADDRESS SHR 16
;
; The memory descriptor table begins at 0x70000
;
dw 0
dw 7
public _MachineType
_MachineType dd 0 ; Machine type infor.
;
; pointer to where osloader.exe is in memory
;
public _OsLoaderStart
_OsLoaderStart dd 0
public _OsLoaderEnd
_OsLoaderEnd dd 0
public _ResourceDirectory
_ResourceDirectory dd 0
public _ResourceOffset
_ResourceOffset dd 0
public _OsLoaderBase
_OsLoaderBase dd 0
public _OsLoaderExports
_OsLoaderExports dd 0
public _BootFlags
_BootFlags dd 0
public _NtDetectStart
_NtDetectStart dd 0
public _NtDetectEnd
_NtDetectEnd dd 0
public _SdiAddress
_SdiAddress dd 0
;
; Defines the machine variables, we can use them to check the validity of
; loaded Ram Extension later.
;
public MachineModel, MachineSubmodel, BiosRevision
MachineModel db 0
MachineSubmodel db 0
BiosRevision db 0
;
; keeps track of 8042 access failing so we can avoid doing it repeatedly
;
public _Empty_8042Failed
_Empty_8042Failed db 0
_DATA ends
end