source: branches/minix3-book/kernel/system/do_getinfo.c@ 20

Last change on this file since 20 was 4, checked in by Mattia Monga, 14 years ago

Importazione sorgenti libro
File size: 4.5 KB
Line 
1/* The kernel call implemented in this file:
2 * m_type: SYS_GETINFO
3 *
4 * The parameters for this kernel call are:
5 * m1_i3: I_REQUEST (what info to get)
6 * m1_p1: I_VAL_PTR (where to put it)
7 * m1_i1: I_VAL_LEN (maximum length expected, optional)
8 * m1_p2: I_VAL_PTR2 (second, optional pointer)
9 * m1_i2: I_VAL_LEN2 (second length or process nr)
10 */
11
12#include "../system.h"
13
14static unsigned long bios_buf[1024]; /* 4K, what about alignment */
15static vir_bytes bios_buf_vir, bios_buf_len;
16
17#if USE_GETINFO
18
19/*===========================================================================*
20 * do_getinfo *
21 *===========================================================================*/
22PUBLIC int do_getinfo(m_ptr)
23register message *m_ptr; /* pointer to request message */
24{
25/* Request system information to be copied to caller's address space. This
26 * call simply copies entire data structures to the caller.
27 */
28 size_t length;
29 phys_bytes src_phys;
30 phys_bytes dst_phys;
31 int proc_nr, nr;
32
33 /* Set source address and length based on request type. */
34 switch (m_ptr->I_REQUEST) {
35 case GET_MACHINE: {
36 length = sizeof(struct machine);
37 src_phys = vir2phys(&machine);
38 break;
39 }
40 case GET_KINFO: {
41 length = sizeof(struct kinfo);
42 src_phys = vir2phys(&kinfo);
43 break;
44 }
45 case GET_IMAGE: {
46 length = sizeof(struct boot_image) * NR_BOOT_PROCS;
47 src_phys = vir2phys(image);
48 break;
49 }
50 case GET_IRQHOOKS: {
51 length = sizeof(struct irq_hook) * NR_IRQ_HOOKS;
52 src_phys = vir2phys(irq_hooks);
53 break;
54 }
55 case GET_SCHEDINFO: {
56 /* This is slightly complicated because we need two data structures
57 * at once, otherwise the scheduling information may be incorrect.
58 * Copy the queue heads and fall through to copy the process table.
59 */
60 length = sizeof(struct proc *) * NR_SCHED_QUEUES;
61 src_phys = vir2phys(rdy_head);
62 dst_phys = numap_local(m_ptr->m_source, (vir_bytes) m_ptr->I_VAL_PTR2,
63 length);
64 if (src_phys == 0 || dst_phys == 0) return(EFAULT);
65 phys_copy(src_phys, dst_phys, length);
66 /* fall through */
67 }
68 case GET_PROCTAB: {
69 length = sizeof(struct proc) * (NR_PROCS + NR_TASKS);
70 src_phys = vir2phys(proc);
71 break;
72 }
73 case GET_PRIVTAB: {
74 length = sizeof(struct priv) * (NR_SYS_PROCS);
75 src_phys = vir2phys(priv);
76 break;
77 }
78 case GET_PROC: {
79 nr = (m_ptr->I_VAL_LEN2 == SELF) ? m_ptr->m_source : m_ptr->I_VAL_LEN2;
80 if (! isokprocn(nr)) return(EINVAL); /* validate request */
81 length = sizeof(struct proc);
82 src_phys = vir2phys(proc_addr(nr));
83 break;
84 }
85 case GET_MONPARAMS: {
86 src_phys = kinfo.params_base; /* already is a physical */
87 length = kinfo.params_size;
88 break;
89 }
90 case GET_RANDOMNESS: {
91 static struct randomness copy; /* copy to keep counters */
92 int i;
93
94 copy = krandom;
95 for (i= 0; i<RANDOM_SOURCES; i++) {
96 krandom.bin[i].r_size = 0; /* invalidate random data */
97 krandom.bin[i].r_next = 0;
98 }
99 length = sizeof(struct randomness);
100 src_phys = vir2phys(&copy);
101 break;
102 }
103 case GET_KMESSAGES: {
104 length = sizeof(struct kmessages);
105 src_phys = vir2phys(&kmess);
106 break;
107 }
108#if DEBUG_TIME_LOCKS
109 case GET_LOCKTIMING: {
110 length = sizeof(timingdata);
111 src_phys = vir2phys(timingdata);
112 break;
113 }
114#endif
115 case GET_BIOSBUFFER:
116 bios_buf_vir = (vir_bytes)bios_buf;
117 bios_buf_len = sizeof(bios_buf);
118
119 length = sizeof(bios_buf_len);
120 src_phys = vir2phys(&bios_buf_len);
121 if (length != m_ptr->I_VAL_LEN2) return (EINVAL);
122 proc_nr = m_ptr->m_source; /* only caller can request copy */
123 dst_phys = numap_local(proc_nr, (vir_bytes) m_ptr->I_VAL_PTR2, length);
124 if (src_phys == 0 || dst_phys == 0) return(EFAULT);
125 phys_copy(src_phys, dst_phys, length);
126
127 length = sizeof(bios_buf_vir);
128 src_phys = vir2phys(&bios_buf_vir);
129 break;
130
131 default:
132 return(EINVAL);
133 }
134
135 /* Try to make the actual copy for the requested data. */
136 if (m_ptr->I_VAL_LEN > 0 && length > m_ptr->I_VAL_LEN) return (E2BIG);
137 proc_nr = m_ptr->m_source; /* only caller can request copy */
138 dst_phys = numap_local(proc_nr, (vir_bytes) m_ptr->I_VAL_PTR, length);
139 if (src_phys == 0 || dst_phys == 0) return(EFAULT);
140 phys_copy(src_phys, dst_phys, length);
141 return(OK);
142}
143
144#endif /* USE_GETINFO */
145
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