1 | /* |
---|
2 | * Intel i386 Dependent Source |
---|
3 | * |
---|
4 | * |
---|
5 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
---|
6 | * On-Line Applications Research Corporation (OAR). |
---|
7 | * All rights assigned to U.S. Government, 1994. |
---|
8 | * |
---|
9 | * This material may be reproduced by or for the U.S. Government pursuant |
---|
10 | * to the copyright license under the clause at DFARS 252.227-7013. This |
---|
11 | * notice must appear in all copies of this file and its derivatives. |
---|
12 | * |
---|
13 | * $Id$ |
---|
14 | */ |
---|
15 | |
---|
16 | #include <rtems/system.h> |
---|
17 | #include <rtems/fatal.h> |
---|
18 | #include <rtems/isr.h> |
---|
19 | #include <rtems/wkspace.h> |
---|
20 | |
---|
21 | /* _CPU_Initialize |
---|
22 | * |
---|
23 | * This routine performs processor dependent initialization. |
---|
24 | * |
---|
25 | * INPUT PARAMETERS: |
---|
26 | * cpu_table - CPU table to initialize |
---|
27 | * thread_dispatch - address of disptaching routine |
---|
28 | */ |
---|
29 | |
---|
30 | |
---|
31 | void _CPU_Initialize( |
---|
32 | rtems_cpu_table *cpu_table, |
---|
33 | void (*thread_dispatch) /* ignored on this CPU */ |
---|
34 | ) |
---|
35 | { |
---|
36 | register unsigned16 fp_status asm ("ax"); |
---|
37 | register unsigned8 *fp_context; |
---|
38 | |
---|
39 | if ( cpu_table == NULL ) |
---|
40 | rtems_fatal_error_occurred( RTEMS_NOT_CONFIGURED ); |
---|
41 | |
---|
42 | _CPU_Table = *cpu_table; |
---|
43 | |
---|
44 | /* |
---|
45 | * The following code saves a NULL i387 context which is given |
---|
46 | * to each task at start and restart time. The following code |
---|
47 | * is based upon that provided in the i386 Programmer's |
---|
48 | * Manual and should work on any coprocessor greater than |
---|
49 | * the i80287. |
---|
50 | * |
---|
51 | * NOTE: The NO RTEMS_WAIT form of the coprocessor instructions |
---|
52 | * MUST be used in case there is not a coprocessor |
---|
53 | * to wait for. |
---|
54 | */ |
---|
55 | |
---|
56 | fp_status = 0xa5a5; |
---|
57 | asm volatile( "fninit" ); |
---|
58 | asm volatile( "fnstsw %0" : "=a" (fp_status) : "0" (fp_status) ); |
---|
59 | |
---|
60 | if ( fp_status == 0 ) { |
---|
61 | |
---|
62 | fp_context = _CPU_Null_fp_context; |
---|
63 | |
---|
64 | asm volatile( "fsave (%0)" : "=r" (fp_context) |
---|
65 | : "0" (fp_context) |
---|
66 | ); |
---|
67 | } |
---|
68 | } |
---|
69 | |
---|
70 | /*PAGE |
---|
71 | * |
---|
72 | * _CPU_ISR_install_raw_handler |
---|
73 | */ |
---|
74 | |
---|
75 | #if __GO32__ |
---|
76 | #include <cpu.h> |
---|
77 | #include <go32.h> |
---|
78 | #include <dpmi.h> |
---|
79 | #endif /* __GO32__ */ |
---|
80 | |
---|
81 | void _CPU_ISR_install_raw_handler( |
---|
82 | unsigned32 vector, |
---|
83 | proc_ptr new_handler, |
---|
84 | proc_ptr *old_handler |
---|
85 | ) |
---|
86 | { |
---|
87 | #if __GO32__ |
---|
88 | _go32_dpmi_seginfo handler_info; |
---|
89 | |
---|
90 | *old_handler = 0; /* XXX not supported */ |
---|
91 | |
---|
92 | handler_info.pm_offset = new_handler; |
---|
93 | handler_info.pm_selector = _go32_my_cs(); |
---|
94 | |
---|
95 | /* install the IDT entry */ |
---|
96 | _go32_dpmi_set_protected_mode_interrupt_vector( vector, &handler_info ); |
---|
97 | #else |
---|
98 | i386_IDT_slot idt; |
---|
99 | unsigned32 handler; |
---|
100 | |
---|
101 | *old_handler = 0; /* XXX not supported */ |
---|
102 | |
---|
103 | handler = (unsigned32) new_handler; |
---|
104 | |
---|
105 | /* build the IDT entry */ |
---|
106 | idt.offset_0_15 = handler & 0xffff; |
---|
107 | idt.segment_selector = i386_get_cs(); |
---|
108 | idt.reserved = 0x00; |
---|
109 | idt.p_dpl = 0x8e; /* present, ISR */ |
---|
110 | idt.offset_16_31 = handler >> 16; |
---|
111 | |
---|
112 | /* install the IDT entry */ |
---|
113 | i386_Install_idt( |
---|
114 | (unsigned32) &idt, |
---|
115 | _CPU_Table.interrupt_table_segment, |
---|
116 | (unsigned32) _CPU_Table.interrupt_table_offset + (8 * vector) |
---|
117 | ); |
---|
118 | #endif |
---|
119 | } |
---|
120 | |
---|
121 | /*PAGE |
---|
122 | * |
---|
123 | * _CPU_ISR_install_vector |
---|
124 | * |
---|
125 | * This kernel routine installs the RTEMS handler for the |
---|
126 | * specified vector. |
---|
127 | * |
---|
128 | * Input parameters: |
---|
129 | * vector - interrupt vector number |
---|
130 | * old_handler - former ISR for this vector number |
---|
131 | * new_handler - replacement ISR for this vector number |
---|
132 | * |
---|
133 | * Output parameters: NONE |
---|
134 | * |
---|
135 | */ |
---|
136 | |
---|
137 | void _ISR_Handler_0(), _ISR_Handler_1(); |
---|
138 | |
---|
139 | #define PER_ISR_ENTRY \ |
---|
140 | (((unsigned32) _ISR_Handler_1 - (unsigned32) _ISR_Handler_0)) |
---|
141 | |
---|
142 | #define _Interrupt_Handler_entry( _vector ) \ |
---|
143 | (((unsigned32)_ISR_Handler_0) + ((_vector) * PER_ISR_ENTRY)) |
---|
144 | |
---|
145 | void _CPU_ISR_install_vector( |
---|
146 | unsigned32 vector, |
---|
147 | proc_ptr new_handler, |
---|
148 | proc_ptr *old_handler |
---|
149 | ) |
---|
150 | { |
---|
151 | proc_ptr ignored; |
---|
152 | unsigned32 unique_handler; |
---|
153 | |
---|
154 | *old_handler = _ISR_Vector_table[ vector ]; |
---|
155 | |
---|
156 | /* calculate the unique entry point for this vector */ |
---|
157 | unique_handler = _Interrupt_Handler_entry( vector ); |
---|
158 | |
---|
159 | _CPU_ISR_install_raw_handler( vector, (void *)unique_handler, &ignored ); |
---|
160 | |
---|
161 | _ISR_Vector_table[ vector ] = new_handler; |
---|
162 | } |
---|