1 ;; -----------------------------------------------------------------------
3 ;; Copyright 1994-2009 H. Peter Anvin - All Rights Reserved
4 ;; Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin
6 ;; This program is free software; you can redistribute it and/or modify
7 ;; it under the terms of the GNU General Public License as published by
8 ;; the Free Software Foundation, Inc., 53 Temple Place Ste 330,
9 ;; Boston MA 02111-1307, USA; either version 2 of the License, or
10 ;; (at your option) any later version; incorporated herein by reference.
12 ;; -----------------------------------------------------------------------
17 ;; Common code for running a COMBOOT image
21 ; Parameter registers definition; this is the definition
22 ; of the stack frame used by INT 21h and INT 22h.
23 %define P_FLAGS word [bp+44]
24 %define P_FLAGSL byte [bp+44]
25 %define P_FLAGSH byte [bp+45]
26 %define P_CS word [bp+42]
27 %define P_IP word [bp+40]
28 %define P_CSIP dword [bp+40]
29 %define P_DS word [bp+38]
30 %define P_ES word [bp+36]
31 %define P_FS word [bp+34]
32 %define P_GS word [bp+32]
33 %define P_EAX dword [bp+28]
34 %define P_AX word [bp+28]
35 %define P_HAX word [bp+30]
36 %define P_AL byte [bp+28]
37 %define P_AH byte [bp+29]
38 %define P_ECX dword [bp+24]
39 %define P_CX word [bp+24]
40 %define P_HCX word [bp+26]
41 %define P_CL byte [bp+24]
42 %define P_CH byte [bp+25]
43 %define P_EDX dword [bp+20]
44 %define P_DX word [bp+20]
45 %define P_HDX word [bp+22]
46 %define P_DL byte [bp+20]
47 %define P_DH byte [bp+21]
48 %define P_EBX dword [bp+16]
49 %define P_BX word [bp+16]
50 %define P_HBX word [bp+18]
51 %define P_BL byte [bp+16]
52 %define P_BH byte [bp+17]
53 %define P_EBP dword [bp+8]
54 %define P_BP word [bp+8]
55 %define P_HBP word [bp+10]
56 %define P_ESI dword [bp+4]
57 %define P_SI word [bp+4]
58 %define P_HSI word [bp+6]
59 %define P_EDI dword [bp]
60 %define P_DI word [bp]
61 %define P_HDI word [bp+2]
64 ; Set up the COMBOOT API interrupt vectors. This is now done at
65 ; initialization time.
68 mov di,DOSErrTramp ; Error trampolines
71 mov eax,02EB206Ah ; push 20h; jmp $+4
77 mov ax,comboot_bogus-2
82 mov si,4*20h ; DOS interrupt vectors
83 mov bx,comboot_vectors
95 ; Restore the original state of the COMBOOT API vectors, and free
96 ; any low memory allocated by the comboot module.
98 global comboot_cleanup_api:function hidden
101 mov si,DOSSaveVectors
104 rep movsd ; Restore DOS-range vectors
110 DOSSaveVectors resd 32
113 %define comboot_err(x) (DOSErrTramp+4*((x)-20h))
116 dw comboot_return ; INT 20 = exit
117 dw comboot_err(21h) ; INT 21 = DOS-compatible system calls
118 dw comboot_int22 ; INT 22 = native system calls
119 dw comboot_err(23h) ; INT 23 = DOS Ctrl-C handler
120 dw comboot_err(24h) ; INT 24 = DOS critical error handler
121 dw comboot_err(25h) ; INT 25 = DOS absolute disk read
122 dw comboot_err(26h) ; INT 26 = DOS absolute disk write
123 dw comboot_err(27h) ; INT 27 = DOS TSR
124 dw comboot_int28 ; INT 28 = DOS idle interrupt
125 dw comboot_int29 ; INT 29 = DOS fast console output
126 dw comboot_err(2Ah) ; INT 2A = DOS network API (NetBIOS)
127 dw comboot_err(2Bh) ; INT 2B = DOS reserved
128 dw comboot_err(2Ch) ; INT 2C = DOS reserved
129 dw comboot_iret ; INT 2D = DOS reserved, AMIS
130 dw comboot_err(2Eh) ; INT 2E = DOS run command
131 dw comboot_iret ; INT 2F = DOS multiplex interrupt
132 dw comboot_err(30h) ; INT 30 = DOS CP/M system calls
133 dw comboot_err(31h) ; INT 31 = DPMI
134 dw comboot_err(32h) ; INT 32 = DOS reserved
135 dw comboot_iret ; INT 33 = DOS mouse API
136 dw comboot_err(34h) ; INT 34 = DOS FPU emulation
137 dw comboot_err(35h) ; INT 35 = DOS FPU emulation
138 dw comboot_err(36h) ; INT 36 = DOS FPU emulation
139 dw comboot_err(37h) ; INT 37 = DOS FPU emulation
140 dw comboot_err(38h) ; INT 38 = DOS FPU emulation
141 dw comboot_err(39h) ; INT 39 = DOS FPU emulation
142 dw comboot_err(3Ah) ; INT 3A = DOS FPU emulation
143 dw comboot_err(3Bh) ; INT 3B = DOS FPU emulation
144 dw comboot_err(3Ch) ; INT 3C = DOS FPU emulation
145 dw comboot_err(3Dh) ; INT 3D = DOS FPU emulation
146 dw comboot_err(3Eh) ; INT 3E = DOS FPU emulation
147 dw comboot_err(3Fh) ; INT 3F = DOS overlay manager
152 mov bp,sp ; In case the function clobbers BP
153 setc P_FLAGSL ; Propagate CF->error
168 ; Attempted to execute invalid DOS system call
169 ; The interrupt number is on the stack.
170 comboot_bogus: pop dx ; Interrupt number
173 push comboot_bogus_tail
177 pm_call pm_writehex2 ; Interrupt number
181 pm_call pm_writehex4 ; Function number (AX)
185 pm_call pm_writehex8 ; CS:IP of the origin
189 ; Proper return vector
190 ; Note: this gets invoked directly via INT 20h.
191 ; We don't need to cld explicitly here, because comboot_exit does that
192 ; when invoking RESET_STACK_AND_SEGS.
194 cli ; May not have a safe stack
195 push enter_command ; Normal return to command prompt
199 ; Generic COMBOOT return to command line code
200 ; stack -> where to go next
201 ; CX -> message (for _msg version)
203 extern comboot_cleanup_lowmem
207 pop bx ; Return address
208 RESET_STACK_AND_SEGS si ; Contains sti, cld
209 pm_call comboot_cleanup_lowmem
210 pm_call pm_adjust_screen; The COMBOOT program might have change the screen
220 ; INT 21h system calls
222 comboot_getkey: ; 01 = get key with echo
223 pm_call vgashowcursor
225 pm_call vgahidecursor
230 comboot_writechr: ; 02 = writechr
236 comboot_writeserial: ; 04 = write serial port
238 pm_call pm_write_serial
242 comboot_getkeynoecho: ; 08 = get key w/o echo
247 comboot_writestr: ; 09 = write DOS string
251 cmp al,'$' ; End string with $ - bizarre
258 comboot_checkkey: ; 0B = check keyboard status
259 cmp byte [APIKeyFlag],00h
263 dec al ; AL = 0FFh if present, 0 if not
268 comboot_checkver: ; 30 = check DOS version
269 ; We return 0 in all DOS-compatible version registers,
270 ; but the high part of eax-ebx-ecx-edx spell "SYSLINUX"
278 cmp byte [APIKeyFlag],00h
280 pm_call pm_getchar ; If not queued get input
281 and al,al ; Function key? (CF <- 0)
283 mov [APIKeyWait],ah ; High part of key
284 inc byte [APIKeyFlag] ; Set flag
287 .queued: mov al,[APIKeyWait]
288 dec byte [APIKeyFlag]
301 ; INT 29h - DOS fast write character
310 ; INT 22h - SYSLINUX-specific system calls
311 ; System call number in ax
324 mov bp,sp ; Set up stack frame
326 pm_call pm_adjust_screen ; The COMBOOT program might hav changed the screen
330 xor ax,ax ; Function 0 -> unimplemented
334 call [bx+int22_table]
335 jmp comboot_resume ; On return
338 ; INT 22h AX=0000h Unimplemented call
345 ; INT 22h AX=000Ah Get Derivative-Specific Info
360 mov eax,[IPInfo.MyIP]
375 %if IS_SYSLINUX || IS_EXTLINUX
384 mov P_CH,al ; Mode (el torito/cbios/ebios)
391 ; INT 22h AX=001Ch Get pointer to auxillary data vector
400 ; INT 22h AX=001Dh Write auxillary data vector
402 comapi_writeadv equ adv_write
405 ; INT 22h AX=0024h Cleanup, shuffle and boot raw
409 ; Unload PXE if requested
412 sub bp,sp ; unload_pxe may move the stack around
414 add bp,sp ; restore frame pointer...
415 %elif IS_SYSLINUX || IS_EXTLINUX
416 ; Restore original FDC table
417 mov eax,[OrigFDCTabPtr]
420 pm_call cleanup_hardware
424 jmp shuffle_and_boot_raw
427 ; INT 22h AX=0025h Initialize the ADV structure
437 dw comapi_err ; 0000 unimplemented syscall
438 dw comapi_err ; 0001 get SYSLINUX version
439 dw comapi_err ; 0002 write string
440 dw comapi_err ; 0003 run specified command
441 dw comapi_err ; 0004 run default command
442 dw comapi_err ; 0005 force text mode
443 dw comapi_err ; 0006 open file
444 dw comapi_err ; 0007 read file
445 dw comapi_err ; 0008 close file
446 dw comapi_err ; 0009 call PXE stack
447 dw comapi_derinfo ; 000A derivative-specific info
448 dw comapi_err ; 000B get serial port config
449 dw comapi_err ; 000C perform final cleanup
450 dw comapi_err ; 000D clean up then bootstrap
451 dw comapi_err ; 000E get name of config file
452 dw comapi_err ; 000F get ipappend strings
453 dw comapi_err ; 0010 resolve hostname
454 dw comapi_err ; 0011 maximum shuffle descriptors
455 dw comapi_err ; 0012 cleanup, shuffle and boot
456 dw comapi_err ; 0013 idle call
457 dw comapi_err ; 0014 local boot
458 dw comapi_err ; 0015 feature flags
459 dw comapi_err ; 0016 run kernel image
460 dw comapi_err ; 0017 report video mode change
461 dw comapi_err ; 0018 query custom font
462 dw comapi_err ; 0019 read disk
463 dw comapi_err ; 001A cleanup, shuffle and boot to pm
464 dw comapi_err ; 001B cleanup, shuffle and boot to rm
465 dw comapi_getadv ; 001C get pointer to ADV
466 dw comapi_writeadv ; 001D write ADV to disk
467 dw comapi_err ; 001E keyboard remapping table
468 dw comapi_err ; 001F get current working directory
469 dw comapi_err ; 0020 open directory
470 dw comapi_err ; 0021 read directory
471 dw comapi_err ; 0022 close directory
472 dw comapi_err ; 0023 query shuffler size
473 dw comapi_shufraw ; 0024 cleanup, shuffle and boot raw
474 dw comapi_initadv ; 0025 initialize adv structure
475 int22_count equ ($-int22_table)/2
480 zero_string db 0 ; Empty, null-terminated string
482 err_notdos db ': attempted DOS system call INT ',0
483 err_comlarge db 'COMBOOT image too large.', CR, LF, 0
487 DOSErrTramp resd 33 ; Error trampolines
489 %ifndef HAVE_CURRENTDIRNAME
490 global CurrentDirName:data hidden
491 CurrentDirName resb FILENAME_MAX