97 lines
2.6 KiB
PHP
97 lines
2.6 KiB
PHP
;; $Id: loadhigh.inc,v 1.7 2005/01/06 22:34:06 hpa Exp $
|
|
;; -----------------------------------------------------------------------
|
|
;;
|
|
;; Copyright 1994-2002 H. Peter Anvin - All Rights Reserved
|
|
;;
|
|
;; This program is free software; you can redistribute it and/or modify
|
|
;; it under the terms of the GNU General Public License as published by
|
|
;; the Free Software Foundation, Inc., 53 Temple Place Ste 330,
|
|
;; Boston MA 02111-1307, USA; either version 2 of the License, or
|
|
;; (at your option) any later version; incorporated herein by reference.
|
|
;;
|
|
;; -----------------------------------------------------------------------
|
|
|
|
;;
|
|
;; loadhigh.inc
|
|
;;
|
|
;; Load a file into high memory
|
|
;;
|
|
|
|
section .text
|
|
|
|
;
|
|
; load_high: loads (the remainder of) a file into high memory.
|
|
; This routine prints dots for each 64K transferred, and
|
|
; calls abort_check periodically.
|
|
;
|
|
; The xfer_buf_seg is used as a bounce buffer.
|
|
;
|
|
; The input address (EDI) should be dword aligned, and the final
|
|
; stretch is padded with zeroes if necessary.
|
|
;
|
|
; Inputs: SI = file handle/cluster pointer
|
|
; EDI = target address in high memory
|
|
; EAX = size of remaining file in bytes
|
|
; DX = zero-padding mask (e.g. 0003h for pad to dword)
|
|
;
|
|
; Outputs: SI = file handle/cluster pointer
|
|
; EDI = first untouched address (not including padding)
|
|
;
|
|
load_high:
|
|
push es
|
|
|
|
mov bx,xfer_buf_seg
|
|
mov es,bx
|
|
|
|
.read_loop:
|
|
and si,si ; If SI == 0 then we have end of file
|
|
jz .eof
|
|
push si
|
|
mov si,dot_msg
|
|
call cwritestr
|
|
pop si
|
|
call abort_check
|
|
|
|
push eax ; <A> Total bytes to transfer
|
|
cmp eax,(1 << 16) ; Max 64K in one transfer
|
|
jna .size_ok
|
|
mov eax,(1 << 16)
|
|
.size_ok:
|
|
push eax ; <B> Bytes transferred this chunk
|
|
add eax,SECTOR_SIZE-1
|
|
shr eax,SECTOR_SHIFT ; Convert to sectors
|
|
|
|
; Now (e)ax contains the number of sectors to get
|
|
push edi ; <C> Target buffer
|
|
mov cx,ax
|
|
xor bx,bx ; ES:0
|
|
call getfssec ; Load the data into xfer_buf_seg
|
|
pop edi ; <C> Target buffer
|
|
pop ecx ; <B> Byte count this round
|
|
push ecx ; <B> Byte count this round
|
|
push edi ; <C> Target buffer
|
|
.fix_slop:
|
|
test cx,dx
|
|
jz .noslop
|
|
; The last dword fractional - pad with zeroes
|
|
; Zero-padding is critical for multi-file initramfs.
|
|
mov byte [es:ecx],0
|
|
inc ecx
|
|
jmp short .fix_slop
|
|
.noslop:
|
|
push esi ; <D> File handle/cluster pointer
|
|
mov esi,(xfer_buf_seg << 4) ; Source address
|
|
call bcopy ; Copy to high memory
|
|
pop esi ; <D> File handle/cluster pointer
|
|
pop edi ; <C> Target buffer
|
|
pop ecx ; <B> Byte count this round
|
|
pop eax ; <A> Total bytes to transfer
|
|
add edi,ecx
|
|
sub eax,ecx
|
|
jnz .read_loop ; More to read...
|
|
|
|
.eof:
|
|
pop es
|
|
ret
|
|
|