1 ;; -----------------------------------------------------------------------
3 ;; Copyright 1994-2002 H. Peter Anvin - All Rights Reserved
5 ;; This program is free software; you can redistribute it and/or modify
6 ;; it under the terms of the GNU General Public License as published by
7 ;; the Free Software Foundation, Inc., 53 Temple Place Ste 330,
8 ;; Boston MA 02111-1307, USA; either version 2 of the License, or
9 ;; (at your option) any later version; incorporated herein by reference.
11 ;; -----------------------------------------------------------------------
16 ;; Load a file into high memory
22 ; load_high: loads (the remainder of) a file into high memory.
23 ; This routine prints dots for each 64K transferred, and
24 ; calls abort_check periodically.
26 ; The xfer_buf_seg is used as a bounce buffer.
28 ; The input address (EDI) should be dword aligned, and the final
29 ; stretch is padded with zeroes if necessary.
31 ; Inputs: SI = file handle/cluster pointer
32 ; EDI = target address in high memory
33 ; EAX = size of remaining file in bytes
34 ; DX = zero-padding mask (e.g. 0003h for pad to dword)
36 ; Outputs: SI = file handle/cluster pointer
37 ; EDI = first untouched address (not including padding)
46 and si,si ; If SI == 0 then we have end of file
54 push eax ; <A> Total bytes to transfer
55 cmp eax,(1 << 16) ; Max 64K in one transfer
59 push eax ; <B> Bytes transferred this chunk
61 shr eax,SECTOR_SHIFT ; Convert to sectors
63 ; Now (e)ax contains the number of sectors to get
64 push edi ; <C> Target buffer
67 call getfssec ; Load the data into xfer_buf_seg
68 pop edi ; <C> Target buffer
69 pop ecx ; <B> Byte count this round
70 push ecx ; <B> Byte count this round
71 push edi ; <C> Target buffer
75 ; The last dword fractional - pad with zeroes
76 ; Zero-padding is critical for multi-file initramfs.
81 push esi ; <D> File handle/cluster pointer
82 mov esi,(xfer_buf_seg << 4) ; Source address
83 call bcopy ; Copy to high memory
84 pop esi ; <D> File handle/cluster pointer
85 pop edi ; <C> Target buffer
86 pop ecx ; <B> Byte count this round
87 pop eax ; <A> Total bytes to transfer
90 jnz .read_loop ; More to read...