Diff of /trunk/mkinitrd-magellan/isolinux/loadhigh.inc

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	revision 1132 by niro, Sat Sep 1 22:45:15 2007 UTC	revision 1133 by niro, Thu Aug 19 09:50:43 2010 UTC
#	Line 1	Line 1
	;; $Id: loadhigh.inc,v 1.1 2007-09-01 22:44:05 niro Exp $
1	;; -----------------------------------------------------------------------	;; -----------------------------------------------------------------------
2	;;	;;
3	;;   Copyright 1994-2002 H. Peter Anvin - All Rights Reserved	;;   Copyright 1994-2009 H. Peter Anvin - All Rights Reserved
4		;;   Copyright 2009 Intel Corporation; author: H. Peter Anvin
5	;;	;;
6	;;   This program is free software; you can redistribute it and/or modify	;;   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	;;   it under the terms of the GNU General Public License as published by
#	Line 13	Line 13
13
14	;;	;;
15	;; loadhigh.inc	;; loadhigh.inc
16	;;	;;
17	;; Load a file into high memory	;; Load a file into high memory
18	;;	;;
19
#	Line 23	Line 23
23	; load_high: loads (the remainder of) a file into high memory.	; load_high: loads (the remainder of) a file into high memory.
24	; This routine prints dots for each 64K transferred, and	; This routine prints dots for each 64K transferred, and
25	; calls abort_check periodically.	; calls abort_check periodically.
26	;	;
27	; The xfer_buf_seg is used as a bounce buffer.	; The xfer_buf_seg is used as a bounce buffer.
28	;	;
29		; Assumes CS == DS.
30		;
31	; The input address (EDI) should be dword aligned, and the final	; The input address (EDI) should be dword aligned, and the final
32	; stretch is padded with zeroes if necessary.	; stretch is padded with zeroes if necessary.
33	;	;
34	; Inputs: SI  = file handle/cluster pointer	; Inputs: SI  = file handle/cluster pointer
35	; EDI = target address in high memory	; EDI = target address in high memory
36	; EAX = size of remaining file in bytes	; EAX = maximum number of bytes to load
37	; DX   = zero-padding mask (e.g. 0003h for pad to dword)	; DX  = zero-padding mask (e.g. 0003h for pad to dword)
38		; BX  = subroutine to call at the top of each loop
39		;                     (to print status and check for abort)
40		; MyHighMemSize = maximum load address
41	;	;
42	; Outputs: SI  = file handle/cluster pointer	; Outputs: SI  = file handle/cluster pointer
43	; EDI = first untouched address (not including padding)	; EBX = first untouched address (not including padding)
44		; EDI = first untouched address (including padding)
45		; CF  = reached EOF
46	;	;
47	load_high:	load_high:
48	push es	push es ; <AAA> ES
49
50	mov bx,xfer_buf_seg	mov cx,xfer_buf_seg
51	mov es,bx	mov es,cx
52		mov [PauseBird],bx
53
54	.read_loop:	.read_loop:
55	and si,si ; If SI == 0 then we have end of file	and si,si ; If SI == 0 then we have end of file
56	jz .eof	jz .eof
57	push si	call [PauseBird]
	mov si,dot_msg
	call cwritestr
	pop si
	call abort_check
58
59	push eax ; <A> Total bytes to transfer	push eax ; <A> Total bytes to transfer
60	cmp eax,(1 << 16) ; Max 64K in one transfer	cmp eax,(1 << 16) ; Max 64K in one transfer
#	Line 67  load_high:	Line 71  load_high:
71	xor bx,bx ; ES:0	xor bx,bx ; ES:0
72	call getfssec ; Load the data into xfer_buf_seg	call getfssec ; Load the data into xfer_buf_seg
73	pop edi ; <C> Target buffer	pop edi ; <C> Target buffer
74	pop ecx ; <B> Byte count this round	pushf ; <C> EOF status
75	push ecx ; <B> Byte count this round	lea ebx,[edi+ecx] ; End of data
	push edi ; <C> Target buffer
76	.fix_slop:	.fix_slop:
77	test cx,dx	test cx,dx
78	jz .noslop	jz .noslop
79	; The last dword fractional - pad with zeroes	; The last dword fractional - pad with zeroes
80	; Zero-padding is critical for multi-file initramfs.	; Zero-padding is critical for multi-file initramfs.
81	mov byte [es:ecx],0	mov byte [es:ecx],0
82	inc ecx	inc cx
83	jmp short .fix_slop	jmp short .fix_slop
84	.noslop:	.noslop:
85		lea eax,[edi+ecx]
86		cmp eax,[MyHighMemSize]
87		ja .overflow
88
89	push esi ; <D> File handle/cluster pointer	push esi ; <D> File handle/cluster pointer
90	mov esi,(xfer_buf_seg << 4) ; Source address	mov esi,(xfer_buf_seg << 4) ; Source address
91	call bcopy ; Copy to high memory	call bcopy ; Copy to high memory
92	pop esi ; <D> File handle/cluster pointer	pop esi ; <D> File handle/cluster pointer
93	pop edi ; <C> Target buffer	popf ; <C> EOF status
94	pop ecx ; <B> Byte count this round	pop ecx ; <B> Byte count this round
95	pop eax ; <A> Total bytes to transfer	pop eax ; <A> Total bytes to transfer
96	add edi,ecx	jc .eof
97	sub eax,ecx	sub eax,ecx
98	jnz .read_loop ; More to read...	jnz .read_loop ; More to read... (if ZF=1 then CF=0)
99	.eof:	.eof:
100	pop es	pop es ; <AAA> ES
101	ret	ret
102
103		.overflow: mov si,err_nohighmem
104		jmp abort_load
105
106		section .data
107		err_nohighmem   db CR, LF
108		db 'Not enough memory to load specified image.', CR, LF, 0
109
110		section .bss
111		alignb 2
112		PauseBird resw 1
113
114		section .text

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