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