/[dynamips]/trunk/insn_lookup.h
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Annotation of /trunk/insn_lookup.h

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Sat Oct 6 16:45:40 2007 UTC (16 years, 5 months ago) by dpavlin
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1 dpavlin 1 /*
2 dpavlin 7 * Cisco router simulation platform.
3 dpavlin 1 * Copyright (c) 2006 Christophe Fillot (cf@utc.fr)
4     *
5     * MIPS Instruction Lookup Tables.
6     */
7    
8     #ifndef __INSN_LOOKUP_H__
9     #define __INSN_LOOKUP_H__
10    
11     #include "utils.h"
12     #include "hash.h"
13    
14     /* Forward declaration for instruction lookup table */
15     typedef struct insn_lookup insn_lookup_t;
16    
17     /* CBM (Class BitMap) array */
18     #define CBM_SHIFT 5 /* log2(32) */
19     #define CBM_SIZE (1 << CBM_SHIFT) /* Arrays of 32-bits Integers */
20     #define CBM_HASH_SIZE 256 /* Size for Hash Tables */
21    
22     typedef struct cbm_array cbm_array_t;
23     struct cbm_array {
24     int nr_entries; /* Number of entries */
25     int tab[0]; /* Values... */
26     };
27    
28     #define CBM_ARRAY(array,i) ((array)->tab[(i)])
29     #define CBM_CSIZE(count) (((count)*sizeof(int))+sizeof(cbm_array_t))
30    
31     /* callback function prototype for instruction checking */
32     typedef int (*ilt_check_cbk_t)(void *,int value);
33     typedef void *(*ilt_get_insn_cbk_t)(int index);
34    
35     /* RFC (Recursive Flow Classification) arrays */
36     #define RFC_ARRAY_MAXSIZE 65536
37     #define RFC_ARRAY_MAXBITS 16
38     #define RFC_ARRAY_NUMBER 3
39    
40     typedef struct rfc_array rfc_array_t;
41     struct rfc_array {
42     rfc_array_t *parent0,*parent1;
43     int nr_elements;
44    
45     /* Number of Equivalent ID */
46     int nr_eqid;
47    
48     /* Hash Table for Class Bitmaps */
49     hash_table_t *cbm_hash;
50    
51     /* Array to get Class Bitmaps from IDs */
52     cbm_array_t **id2cbm;
53    
54     /* Equivalent ID (eqID) array */
55     int eqID[0];
56     };
57    
58     /* Equivalent Classes */
59     typedef struct rfc_eqclass rfc_eqclass_t;
60     struct rfc_eqclass {
61     cbm_array_t *cbm; /* Class Bitmap */
62     int eqID; /* Index associated to this class */
63     };
64    
65     /* Instruction lookup table */
66     struct insn_lookup {
67     int nr_insn; /* Number of instructions */
68     int cbm_size; /* Size of Class Bitmaps */
69    
70     ilt_get_insn_cbk_t get_insn;
71     ilt_check_cbk_t chk_lo,chk_hi;
72    
73     /* RFC tables */
74     rfc_array_t *rfct[RFC_ARRAY_NUMBER];
75     };
76    
77     /* Instruction lookup */
78     static forced_inline int ilt_get_index(rfc_array_t *a1,rfc_array_t *a2,
79     int i1,int i2)
80     {
81     return((a1->eqID[i1]*a2->nr_eqid) + a2->eqID[i2]);
82     }
83    
84     static forced_inline int ilt_get_idx(insn_lookup_t *ilt,int a1,int a2,
85     int i1,int i2)
86     {
87     return(ilt_get_index(ilt->rfct[a1],ilt->rfct[a2],i1,i2));
88     }
89    
90     static forced_inline int ilt_lookup(insn_lookup_t *ilt,mips_insn_t insn)
91     {
92     int id_i;
93    
94     id_i = ilt_get_idx(ilt,0,1,insn >> 16,insn & 0xFFFF);
95     return(ilt->rfct[2]->eqID[id_i]);
96     }
97    
98     /* Create an instruction lookup table */
99 dpavlin 8 insn_lookup_t *ilt_create(char *table_name,
100     int nr_insn,ilt_get_insn_cbk_t get_insn,
101 dpavlin 1 ilt_check_cbk_t chk_lo,ilt_check_cbk_t chk_hi);
102    
103     #endif

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