| 1 | ; $Id: pcibio32.asm 82968 2020-02-04 10:35:17Z vboxsync $
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| 2 | ;; @file
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| 3 | ; BIOS32 service directory and 32-bit PCI BIOS entry point
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2006-2020 Oracle Corporation
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| 8 | ;
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| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | ; available from http://www.virtualbox.org. This file is free software;
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| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
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| 12 | ; General Public License (GPL) as published by the Free Software
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| 13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | ; --------------------------------------------------------------------
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| 17 |
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| 18 |
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| 19 | ; Public symbols for debugging only
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| 20 | public pcibios32_entry
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| 21 | public bios32_service
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| 22 |
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| 23 | ; The BIOS32 service directory header must be located in the E0000h-FFFF0h
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| 24 | ; range on a paragraph boundary. Note that the actual 32-bit code need not
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| 25 | ; be located below 1MB at all.
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| 26 |
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| 27 | _DATA segment public 'DATA'
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| 28 |
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| 29 | align 16
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| 30 | bios32_directory:
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| 31 | db '_32_' ; ASCII signature
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| 32 | dw bios32_service ; Entry point address...
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| 33 | dw 000Fh ; ...hardcoded to F000 segment
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| 34 | db 0 ; Revision
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| 35 | db 1 ; Length in paras - must be 1
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| 36 | db 0 ; Checksum calculated later
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| 37 | db 5 dup(0) ; Unused, must be zero
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| 38 |
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| 39 | _DATA ends
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| 40 |
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| 41 | .386
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| 42 |
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| 43 | extrn _pci32_function:near
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| 44 |
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| 45 | BIOS32 segment public 'CODE' use32
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| 46 |
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| 47 | ;
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| 48 | ; The BIOS32 Service Directory - must be less than 4K in size (easy!).
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| 49 | ;
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| 50 | bios32_service proc far
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| 51 |
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| 52 | pushfd
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| 53 |
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| 54 | cmp bl, 0 ; Only function 0 supported
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| 55 | jnz b32_bad_func
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| 56 |
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| 57 | cmp eax, 'ICP$' ; "$PCI"
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| 58 | mov al, 80h ; Unknown service
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| 59 | jnz b32_done
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| 60 |
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| 61 | mov ebx, 000f0000h ; Base address (linear)
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| 62 | mov ecx, 0f000h ; Length of service
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| 63 | mov edx, pcibios32_entry ; Entry point offset from base
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| 64 | xor al, al ; Indicate success
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| 65 | b32_done:
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| 66 | popfd
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| 67 | retf
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| 68 |
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| 69 | b32_bad_func:
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| 70 | mov al, 81h ; Unsupported function
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| 71 | jmp b32_done
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| 72 |
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| 73 | bios32_service endp
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| 74 |
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| 75 | ;
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| 76 | ; The 32-bit PCI BIOS entry point - simply calls into C code.
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| 77 | ;
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| 78 | pcibios32_entry proc far
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| 79 |
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| 80 | pushfd ; Preserve flags
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| 81 | cld ; Just in case...
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| 82 |
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| 83 | push es ; Call into C implementation
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| 84 | pushad
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| 85 | call _pci32_function
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| 86 | popad
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| 87 | pop es
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| 88 |
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| 89 | popfd ; Restore flags and return
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| 90 | retf
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| 91 |
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| 92 | pcibios32_entry endp
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| 93 |
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| 94 |
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| 95 | BIOS32 ends
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| 96 |
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| 97 | end
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| 98 |
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