| 1 | ;; ----------------------------------------------------------------------- |
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| 2 | ;; |
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| 3 | ;; Copyright 1994-2009 H. Peter Anvin - All Rights Reserved |
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| 4 | ;; Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin |
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| 5 | ;; |
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| 6 | ;; This program is free software; you can redistribute it and/or modify |
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| 7 | ;; it under the terms of the GNU General Public License as published by |
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| 8 | ;; the Free Software Foundation, Inc., 53 Temple Place Ste 330, |
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| 9 | ;; Boston MA 02111-1307, USA; either version 2 of the License, or |
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| 10 | ;; (at your option) any later version; incorporated herein by reference. |
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| 11 | ;; |
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| 12 | ;; ----------------------------------------------------------------------- |
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| 13 | |
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| 14 | ;; |
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| 15 | ;; com32.inc |
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| 16 | ;; |
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| 17 | ;; Common code for running a COM32 image |
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| 18 | ;; |
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| 19 | |
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| 20 | extern pm_api_vector |
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| 21 | |
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| 22 | ; |
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| 23 | ; Load a COM32 image. A COM32 image is the 32-bit analogue to a DOS |
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| 24 | ; .com file. A COM32 image is loaded at address 0x101000, with %esp |
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| 25 | ; set to the high end of usable memory. |
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| 26 | ; |
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| 27 | ; A COM32 image should begin with the magic bytes: |
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| 28 | ; B8 FF 4C CD 21, which is "mov eax,0x21cd4cff" in 32-bit mode and |
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| 29 | ; "mov ax,0x4cff; int 0x21" in 16-bit mode. This will abort the |
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| 30 | ; program with an error if run in 16-bit mode. |
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| 31 | ; |
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| 32 | bits 16 |
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| 33 | section .data16 |
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| 34 | |
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| 35 | ; Ersatz com32 invocation structure, to make libcom32 |
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| 36 | ; code run the same if linked to the core. This is in |
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| 37 | ; the .data16 segment so HighMemSize can live here. |
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| 38 | ; |
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| 39 | ; Danger, Will Robinson: it's not clear the use of |
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| 40 | ; core_xfer_buf is safe here. |
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| 41 | global __com32:data hidden |
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| 42 | alignz 4 |
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| 43 | __entry_esp: |
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| 44 | dd 0 ; Dummy to avoid _exit issues |
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| 45 | __com32: |
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| 46 | dd 9 ; Argument count |
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| 47 | dd 0 ; No command line |
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| 48 | dd core_intcall ; Intcall entry point |
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| 49 | dd 0 ; Bounce buffer address |
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| 50 | dd 0 ; 64K bounce buffer |
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| 51 | dd core_farcall ; Farcall entry point |
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| 52 | dd core_cfarcall ; Cfarcall entry point |
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| 53 | HighMemSize dd 0 ; End of memory pointer (bytes) |
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| 54 | dd 0 ; No module name |
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| 55 | dd pm_api_vector ; Protected mode functions |
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| 56 | |
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| 57 | section .uibss |
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| 58 | Com32Name resb FILENAME_MAX |
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| 59 | |
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| 60 | section .bss16 |
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| 61 | %ifndef HAVE_CURRENTDIRNAME |
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| 62 | global CurrentDirName:data hidden |
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| 63 | CurrentDirName resb FILENAME_MAX |
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| 64 | %endif |
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| 65 | |
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| 66 | section .text16 |
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