summaryrefslogtreecommitdiffstats
path: root/open.asm
blob: db5e7c2c93b2f5d98953ef2716329d86c0b07983 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
/* -----------------------------------------------------------------------
 *   
 *   Copyright 2013 H. Peter Anvin - All Rights Reserved
 *
 *   Permission is hereby granted, free of charge, to any person
 *   obtaining a copy of this software and associated documentation
 *   files (the "Software"), to deal in the Software without
 *   restriction, including without limitation the rights to use,
 *   copy, modify, merge, publish, distribute, sublicense, and/or
 *   sell copies of the Software, and to permit persons to whom
 *   the Software is furnished to do so, subject to the following
 *   conditions:
 *   
 *   The above copyright notice and this permission notice shall
 *   be included in all copies or substantial portions of the Software.
 *   
 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *   OTHER DEALINGS IN THE SOFTWARE.
 *
 * ----------------------------------------------------------------------- */

/* ------------------------------------------------------------------------- *
 *  fxn_create
 * ------------------------------------------------------------------------- */

GPROC(fxn_create)
	lfsw dos_sdafn,%si
	movb $0x21,%al		/* Action: create or truncate */
	testb $1,F_TOSH
	jz 1f
	movb $0x01,%al		/* Action: create only (= O_EXCL) */
	movw $0x0002,%dx	/* Open mode: compatibility + read/write */
	call do_open
	retw
END(fxn_create)

/* ------------------------------------------------------------------------- *
 *  fxn_open
 * ------------------------------------------------------------------------- */

GPROC(fxn_open)
	lfsw dos_sdafcb,%bx
	movb $0x10,%al			/* Action: open */
	movw %fs:SDF_OPENMODE(%bx),%dx	/* Open mode */
	call do_open
	retw
END(fxn_open)

/* ------------------------------------------------------------------------- *
 *  fxn_spopenfile
 * ------------------------------------------------------------------------- */

GPROC(fxn_spopenfile)
	lfsw dos_sdafcb,%si
	movw %fs:SPN_SPCACTION(%si),%ax	/* Open action */
	movw %fs:SPN_SPCMODE(%si),%dx	/* Open mode */
	call do_open
	andw %ax,%ax
	jnz 1f
	movw %cx,F_CX			/* Status return */
1:
	retw
END(fxn_spopenfile)

/* ------------------------------------------------------------------------- *
 *  do_open
 *
 *  Common interface to all the open variants.  Take the extended open
 *  action code in %ax and the open mode in %dx.  SDN_FN1 contains the
 *  fully qualified filename.
 *
 *  On return, the status code is in %(e)ax and on success an extended
 *  open result code is in %cx.
 * ------------------------------------------------------------------------- */

LPROC(do_open)
	movw $0x08030002,%eax
	retw
END(do_open)