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/*  cpu_asm.S
 *
 *  This file contains all assembly code for the Intel i386 IDT
 *  manipulation.
 *
 *  COPYRIGHT (c) 1998 valette@crf.canon.fr
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.OARcorp.com/rtems/license.html.
 *
 *  $Id: cpu_asm.S,v 1.2 2001-09-27 12:01:22 chris Exp $
 */
 
#include 
 
BEGIN_CODE
/*
 * C callable function enabling to get easilly usable info from
 * the actual value of IDT register.
 *
extern void i386_get_info_from_IDTR (interrupt_gate_descriptor** table,
                                     unsigned* limit);
 */
PUBLIC (i386_get_info_from_IDTR)
PUBLIC (i386_set_IDTR)
PUBLIC (i386_get_info_from_GDTR)
PUBLIC (i386_set_GDTR)
 
SYM (i386_get_info_from_IDTR):
        movl    4(esp), ecx         /* get location where table address */
                                    /*    must be stored */
        movl    8(esp), edx         /* get location table size must be stored */
 
        subl    $6, esp             /* let room to prepare 48 bit IDTR */
 
        sidt    (esp)               /* get 48 bit IDTR value */
 
        movl    2(esp), eax         /* get base */
        movl    eax, (ecx)
 
        movzwl  (esp), eax          /* get limit */
        movl    eax, (edx)
 
        addl    $6, esp             /* restore %esp */
        ret
 
/*
 * C callable function enabling to change the value of IDT register. Must be called
 * with inmterrupt masked at processor level!!!.
 *
extern void i386_set_IDTR (interrupt_gate_descriptor* table,
                           unsigned limit);
 */
SYM (i386_set_IDTR):
 
        leal    4(esp), edx         /* load in edx address of input */
                                    /*    parameter "table" */
 
        movl    (edx), eax          /* load base into eax */
        movl    4(edx), ecx         /* load limit into ecx */
 
        movw    cx, (edx)           /* prepare 48 bit pointer */
        movl    eax, 2(edx)
 
        lidt    (edx)
 
        ret
/*
 *
 * C callable function enabling to get easilly usable info from
 * the actual value of GDT register.
extern void i386_get_info_from_GDTR (segment_descriptors** table,
                                     unsigned* limit);
 */
 
SYM (i386_get_info_from_GDTR):
        movl    4(esp), ecx         /* get location where table address */
                                    /*    must be stored */
        movl    8(esp), edx         /* get location table size must be stored */
 
        subl    $6, esp             /* let room to prepare 48 bit GDTR */
 
        sgdt    (esp)               /* get 48 bit GDTR value */
 
        movl    2(esp), eax         /* get base */
        movl    eax, (ecx)
 
        movzwl  (esp), eax          /* get limit */
        movl    eax, (edx)
 
        addl    $6, esp             /* restore %esp */
        ret
 
/*
 * C callable function enabling to change the value of GDT register.
 * Must be called with interrupts masked at processor level!!!.
 *   extern void i386_set_GDTR (segment_descriptors*, unsigned limit);
 */
SYM (i386_set_GDTR):
 
        leal    4(esp), edx         /* load in edx address of input */
                                    /*   parameter "table" */
 
        movl    (edx), eax          /* load base into eax */
        movl    4(edx), ecx         /* load limit into ecx */
 
        movw    cx, (edx)           /* prepare 48 bit pointer */
        movl    eax, 2(edx)
 
        lgdt    (edx)
 
        ret
 
END_CODE
 
END

Line No.	Rev	Author	Line
1	30	unneback	`/* cpu_asm.S`
2			`*`
3			`* This file contains all assembly code for the Intel i386 IDT`
4			`* manipulation.`
5			`*`
6			`* COPYRIGHT (c) 1998 valette@crf.canon.fr`
7			`*`
8			`* The license and distribution terms for this file may be`
9			`* found in the file LICENSE in this distribution or at`
10			`* http://www.OARcorp.com/rtems/license.html.`
11			`*`
12			`* $Id: cpu_asm.S,v 1.2 2001-09-27 12:01:22 chris Exp $`
13			`*/`
14
15			`#include`
16
17			`BEGIN_CODE`
18			`/*`
19			`* C callable function enabling to get easilly usable info from`
20			`* the actual value of IDT register.`
21			`*`
22			`extern void i386_get_info_from_IDTR (interrupt_gate_descriptor** table,`
23			`unsigned* limit);`
24			`*/`
25			`PUBLIC (i386_get_info_from_IDTR)`
26			`PUBLIC (i386_set_IDTR)`
27			`PUBLIC (i386_get_info_from_GDTR)`
28			`PUBLIC (i386_set_GDTR)`
29
30			`SYM (i386_get_info_from_IDTR):`
31			`movl 4(esp), ecx /* get location where table address */`
32			`/* must be stored */`
33			`movl 8(esp), edx /* get location table size must be stored */`
34
35			`subl $6, esp /* let room to prepare 48 bit IDTR */`
36
37			`sidt (esp) /* get 48 bit IDTR value */`
38
39			`movl 2(esp), eax /* get base */`
40			`movl eax, (ecx)`
41
42			`movzwl (esp), eax /* get limit */`
43			`movl eax, (edx)`
44
45			`addl $6, esp /* restore %esp */`
46			`ret`
47
48			`/*`
49			`* C callable function enabling to change the value of IDT register. Must be called`
50			`* with inmterrupt masked at processor level!!!.`
51			`*`
52			`extern void i386_set_IDTR (interrupt_gate_descriptor* table,`
53			`unsigned limit);`
54			`*/`
55			`SYM (i386_set_IDTR):`
56
57			`leal 4(esp), edx /* load in edx address of input */`
58			`/* parameter "table" */`
59
60			`movl (edx), eax /* load base into eax */`
61			`movl 4(edx), ecx /* load limit into ecx */`
62
63			`movw cx, (edx) /* prepare 48 bit pointer */`
64			`movl eax, 2(edx)`
65
66			`lidt (edx)`
67
68			`ret`
69			`/*`
70			`*`
71			`* C callable function enabling to get easilly usable info from`
72			`* the actual value of GDT register.`
73			`extern void i386_get_info_from_GDTR (segment_descriptors** table,`
74			`unsigned* limit);`
75			`*/`
76
77			`SYM (i386_get_info_from_GDTR):`
78			`movl 4(esp), ecx /* get location where table address */`
79			`/* must be stored */`
80			`movl 8(esp), edx /* get location table size must be stored */`
81
82			`subl $6, esp /* let room to prepare 48 bit GDTR */`
83
84			`sgdt (esp) /* get 48 bit GDTR value */`
85
86			`movl 2(esp), eax /* get base */`
87			`movl eax, (ecx)`
88
89			`movzwl (esp), eax /* get limit */`
90			`movl eax, (edx)`
91
92			`addl $6, esp /* restore %esp */`
93			`ret`
94
95			`/*`
96			`* C callable function enabling to change the value of GDT register.`
97			`* Must be called with interrupts masked at processor level!!!.`
98			`* extern void i386_set_GDTR (segment_descriptors*, unsigned limit);`
99			`*/`
100			`SYM (i386_set_GDTR):`
101
102			`leal 4(esp), edx /* load in edx address of input */`
103			`/* parameter "table" */`
104
105			`movl (edx), eax /* load base into eax */`
106			`movl 4(edx), ecx /* load limit into ecx */`
107
108			`movw cx, (edx) /* prepare 48 bit pointer */`
109			`movl eax, 2(edx)`
110
111			`lgdt (edx)`
112
113			`ret`
114
115			`END_CODE`
116
117			`END`

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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libcpu/] [i386/] [cpu_asm.S] - Blame information for rev 173