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/* DOSMEM.S */
/*
** Copyright (C) 1993 C.W. Sandmann
**
** This file may be freely distributed as long as the author's name remains.
** Extender environment independent way to set up Real area 1Mb access.
** Procedure takes a single argument %eax which contains the real area offset.
** After call, access may be made with "%gs:(%eax)"
*/
        .text
        .align  2
        .globl dosmemsetup
dosmemsetup:                            /* no params, expected ASM call only */
        pushl   %eax
        movzwl  __core_select,%eax
        testl   %eax,%eax
        je      old_go32                /* Image run with pre-DPMI extender */
        movw    %ax,%gs                 /* Use real area selector */
        popl    %eax                    /* Plus real offset */
        andl    $0x0fffffff,%eax        /* Clear any linear access bits */
        ret
        .align  2,0x90
old_go32:
        push    %ds
        pop     %gs                     /* Use arena selector */
        popl    %eax
        orl     $0xe0000000,%eax        /* Plus linear access area */
        ret
 
        .align  2
        .globl _dosmemget
_dosmemget:                             /* long offset, long len, long *buf */
        push    %gs
        movl    8(%esp),%eax            /* offset */
        call    dosmemsetup
        movl    12(%esp),%ecx           /* length */
        movl    16(%esp),%edx           /* arena offset */
        pushl   %esi
        pushl   %edi
        movl    %eax,%esi
        movl    %edx,%edi
        push    %ds
        push    %es
        push    %ds
        pop     %es
        push    %gs
        pop     %ds
        cld
        rep
        movsb                           /* move ECX bytes from Real area */
        pop     %es
        pop     %ds
        popl    %edi
        popl    %esi
        pop     %gs
        ret
 
        .align  2
        .globl _dosmemput
_dosmemput:                             /* long *buf, long len, long offset */
        push    %gs
        movl    16(%esp),%eax           /* offset */
        call    dosmemsetup
        movl    12(%esp),%ecx           /* length */
        movl    8(%esp),%edx            /* arena offset */
        pushl   %esi
        pushl   %edi
        movl    %eax,%edi
        movl    %edx,%esi
        push    %es
        push    %gs
        pop     %es
        cld
        rep
        movsb                           /* move ECX bytes to Real area */
        pop     %es
        popl    %edi
        popl    %esi
        pop     %gs
        ret
 
        .align  2                       /* 8(bp)    12(bp)   16(bp)    20(bp)    24(bp) */
        .globl  _movedata               /* src_sel, src_ofs, dest_sel, dest_ofs, len    */
_movedata:
        pushl   %ebp
        movl    %esp,%ebp
        pushw   %ds
        pushw   %es
        pushl   %esi
        pushl   %edi
 
        movl    8(%ebp),%eax
        movw    %ax,%ds
        movl    12(%ebp),%esi
 
        movl    16(%ebp),%eax
        movw    %ax,%es
        movl    20(%ebp),%edi
 
        movl    24(%ebp),%ecx
        pushl   %ecx
        shrl    $2,%ecx
        jcxz    no_big_move
        rep
        movsl
no_big_move:
        popl    %ecx
        andl    $3,%ecx
        jcxz    no_little_move
        rep
        movsb
no_little_move:
 
        popl    %edi
        popl    %esi
        popw    %es
        popw    %ds
        leave
        ret
 

Line No.	Rev	Author	Line
1	39	lampret	`/* DOSMEM.S */`
2			`/*`
3			`** Copyright (C) 1993 C.W. Sandmann`
4			`**`
5			`** This file may be freely distributed as long as the author's name remains.`
6			`** Extender environment independent way to set up Real area 1Mb access.`
7			`** Procedure takes a single argument %eax which contains the real area offset.`
8			`** After call, access may be made with "%gs:(%eax)"`
9			`*/`
10			`.text`
11			`.align 2`
12			`.globl dosmemsetup`
13			`dosmemsetup: /* no params, expected ASM call only */`
14			`pushl %eax`
15			`movzwl __core_select,%eax`
16			`testl %eax,%eax`
17			`je old_go32 /* Image run with pre-DPMI extender */`
18			`movw %ax,%gs /* Use real area selector */`
19			`popl %eax /* Plus real offset */`
20			`andl $0x0fffffff,%eax /* Clear any linear access bits */`
21			`ret`
22			`.align 2,0x90`
23			`old_go32:`
24			`push %ds`
25			`pop %gs /* Use arena selector */`
26			`popl %eax`
27			`orl $0xe0000000,%eax /* Plus linear access area */`
28			`ret`
29
30			`.align 2`
31			`.globl _dosmemget`
32			`_dosmemget: /* long offset, long len, long buf /`
33			`push %gs`
34			`movl 8(%esp),%eax /* offset */`
35			`call dosmemsetup`
36			`movl 12(%esp),%ecx /* length */`
37			`movl 16(%esp),%edx /* arena offset */`
38			`pushl %esi`
39			`pushl %edi`
40			`movl %eax,%esi`
41			`movl %edx,%edi`
42			`push %ds`
43			`push %es`
44			`push %ds`
45			`pop %es`
46			`push %gs`
47			`pop %ds`
48			`cld`
49			`rep`
50			`movsb /* move ECX bytes from Real area */`
51			`pop %es`
52			`pop %ds`
53			`popl %edi`
54			`popl %esi`
55			`pop %gs`
56			`ret`
57
58			`.align 2`
59			`.globl _dosmemput`
60			`_dosmemput: /* long buf, long len, long offset /`
61			`push %gs`
62			`movl 16(%esp),%eax /* offset */`
63			`call dosmemsetup`
64			`movl 12(%esp),%ecx /* length */`
65			`movl 8(%esp),%edx /* arena offset */`
66			`pushl %esi`
67			`pushl %edi`
68			`movl %eax,%edi`
69			`movl %edx,%esi`
70			`push %es`
71			`push %gs`
72			`pop %es`
73			`cld`
74			`rep`
75			`movsb /* move ECX bytes to Real area */`
76			`pop %es`
77			`popl %edi`
78			`popl %esi`
79			`pop %gs`
80			`ret`
81
82			`.align 2 /* 8(bp) 12(bp) 16(bp) 20(bp) 24(bp) */`
83			`.globl _movedata /* src_sel, src_ofs, dest_sel, dest_ofs, len */`
84			`_movedata:`
85			`pushl %ebp`
86			`movl %esp,%ebp`
87			`pushw %ds`
88			`pushw %es`
89			`pushl %esi`
90			`pushl %edi`
91
92			`movl 8(%ebp),%eax`
93			`movw %ax,%ds`
94			`movl 12(%ebp),%esi`
95
96			`movl 16(%ebp),%eax`
97			`movw %ax,%es`
98			`movl 20(%ebp),%edi`
99
100			`movl 24(%ebp),%ecx`
101			`pushl %ecx`
102			`shrl $2,%ecx`
103			`jcxz no_big_move`
104			`rep`
105			`movsl`
106			`no_big_move:`
107			`popl %ecx`
108			`andl $3,%ecx`
109			`jcxz no_little_move`
110			`rep`
111			`movsb`
112			`no_little_move:`
113
114			`popl %edi`
115			`popl %esi`
116			`popw %es`
117			`popw %ds`
118			`leave`
119			`ret`
120

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[/] [or1k_old/] [trunk/] [newlib/] [newlib/] [libc/] [sys/] [go32/] [dosmem.S] - Blame information for rev 39