1 | /** |
---|
2 | * @file |
---|
3 | * |
---|
4 | * @brief Motorola MC68xxx Dependent Source |
---|
5 | */ |
---|
6 | |
---|
7 | /* |
---|
8 | * COPYRIGHT (c) 1989-1999. |
---|
9 | * On-Line Applications Research Corporation (OAR). |
---|
10 | * |
---|
11 | * The license and distribution terms for this file may be |
---|
12 | * found in the file LICENSE in this distribution or at |
---|
13 | * http://www.rtems.com/license/LICENSE. |
---|
14 | */ |
---|
15 | |
---|
16 | #ifdef HAVE_CONFIG_H |
---|
17 | #include "config.h" |
---|
18 | #endif |
---|
19 | |
---|
20 | #include <rtems/system.h> |
---|
21 | #include <rtems/score/isr.h> |
---|
22 | |
---|
23 | #if defined( __mcoldfire__ ) && ( M68K_HAS_FPU == 1 ) |
---|
24 | uint32_t _CPU_cacr_shadow; |
---|
25 | #endif |
---|
26 | |
---|
27 | void _CPU_Initialize(void) |
---|
28 | { |
---|
29 | #if ( M68K_HAS_VBR == 0 ) |
---|
30 | /* fill the isr redirect table with the code to place the format/id |
---|
31 | onto the stack */ |
---|
32 | |
---|
33 | uint32_t slot; |
---|
34 | |
---|
35 | for (slot = 0; slot < CPU_INTERRUPT_NUMBER_OF_VECTORS; slot++) |
---|
36 | { |
---|
37 | _CPU_ISR_jump_table[slot].move_a7 = M68K_MOVE_A7; |
---|
38 | _CPU_ISR_jump_table[slot].format_id = slot << 2; |
---|
39 | _CPU_ISR_jump_table[slot].jmp = M68K_JMP; |
---|
40 | _CPU_ISR_jump_table[slot].isr_handler = (uint32_t) 0xDEADDEAD; |
---|
41 | } |
---|
42 | #endif /* M68K_HAS_VBR */ |
---|
43 | } |
---|
44 | |
---|
45 | uint32_t _CPU_ISR_Get_level( void ) |
---|
46 | { |
---|
47 | uint32_t level; |
---|
48 | |
---|
49 | m68k_get_interrupt_level( level ); |
---|
50 | |
---|
51 | return level; |
---|
52 | } |
---|
53 | |
---|
54 | /* |
---|
55 | * _CPU_ISR_install_raw_handler |
---|
56 | */ |
---|
57 | |
---|
58 | void _CPU_ISR_install_raw_handler( |
---|
59 | uint32_t vector, |
---|
60 | proc_ptr new_handler, |
---|
61 | proc_ptr *old_handler |
---|
62 | ) |
---|
63 | { |
---|
64 | proc_ptr *interrupt_table = NULL; |
---|
65 | |
---|
66 | #if (M68K_HAS_FPSP_PACKAGE == 1) |
---|
67 | /* |
---|
68 | * If this vector being installed is one related to FP, then the |
---|
69 | * FPSP will install the handler itself and handle it completely |
---|
70 | * with no intervention from RTEMS. |
---|
71 | */ |
---|
72 | |
---|
73 | if (*_FPSP_install_raw_handler && |
---|
74 | (*_FPSP_install_raw_handler)(vector, new_handler, *old_handler)) |
---|
75 | return; |
---|
76 | #endif |
---|
77 | |
---|
78 | |
---|
79 | /* |
---|
80 | * On CPU models without a VBR, it is necessary for there to be some |
---|
81 | * header code for each ISR which saves a register, loads the vector |
---|
82 | * number, and jumps to _ISR_Handler. |
---|
83 | */ |
---|
84 | |
---|
85 | m68k_get_vbr( interrupt_table ); |
---|
86 | #if ( M68K_HAS_VBR == 1 ) |
---|
87 | *old_handler = interrupt_table[ vector ]; |
---|
88 | interrupt_table[ vector ] = new_handler; |
---|
89 | #else |
---|
90 | |
---|
91 | /* |
---|
92 | * Install handler into RTEMS jump table and if VBR table is in |
---|
93 | * RAM, install the pointer to the appropriate jump table slot. |
---|
94 | * If the VBR table is in ROM, it is the BSP's responsibility to |
---|
95 | * load it appropriately to vector to the RTEMS jump table. |
---|
96 | */ |
---|
97 | |
---|
98 | *old_handler = (proc_ptr) _CPU_ISR_jump_table[vector].isr_handler; |
---|
99 | _CPU_ISR_jump_table[vector].isr_handler = (uint32_t) new_handler; |
---|
100 | if ( (uint32_t) interrupt_table != 0xFFFFFFFF ) |
---|
101 | interrupt_table[ vector ] = (proc_ptr) &_CPU_ISR_jump_table[vector]; |
---|
102 | #endif /* M68K_HAS_VBR */ |
---|
103 | } |
---|
104 | |
---|
105 | void _CPU_ISR_install_vector( |
---|
106 | uint32_t vector, |
---|
107 | proc_ptr new_handler, |
---|
108 | proc_ptr *old_handler |
---|
109 | ) |
---|
110 | { |
---|
111 | proc_ptr ignored = 0; /* to avoid warning */ |
---|
112 | |
---|
113 | *old_handler = _ISR_Vector_table[ vector ]; |
---|
114 | |
---|
115 | _CPU_ISR_install_raw_handler( vector, _ISR_Handler, &ignored ); |
---|
116 | |
---|
117 | _ISR_Vector_table[ vector ] = new_handler; |
---|
118 | } |
---|
119 | |
---|
120 | |
---|
121 | /* |
---|
122 | * _CPU_Install_interrupt_stack |
---|
123 | */ |
---|
124 | |
---|
125 | void _CPU_Install_interrupt_stack( void ) |
---|
126 | { |
---|
127 | #if ( M68K_HAS_SEPARATE_STACKS == 1 ) |
---|
128 | void *isp = _CPU_Interrupt_stack_high; |
---|
129 | |
---|
130 | __asm__ volatile ( "movec %0,%%isp" : "=r" (isp) : "0" (isp) ); |
---|
131 | #endif |
---|
132 | } |
---|
133 | |
---|
134 | #if ( M68K_HAS_BFFFO != 1 ) |
---|
135 | /* |
---|
136 | * Returns table for duplication of the BFFFO instruction (16 bits only) |
---|
137 | */ |
---|
138 | const unsigned char _CPU_m68k_BFFFO_table[256] = { |
---|
139 | 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, |
---|
140 | 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, |
---|
141 | 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, |
---|
142 | 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, |
---|
143 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
---|
144 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
---|
145 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
---|
146 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
---|
147 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
---|
148 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
---|
149 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
---|
150 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
---|
151 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
---|
152 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
---|
153 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
---|
154 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
---|
155 | }; |
---|
156 | #endif |
---|
157 | |
---|
158 | /* |
---|
159 | * The following code context switches the software FPU emulation |
---|
160 | * code provided with GCC. |
---|
161 | */ |
---|
162 | |
---|
163 | #if (CPU_SOFTWARE_FP == TRUE) |
---|
164 | extern Context_Control_fp _fpCCR; |
---|
165 | |
---|
166 | void _CPU_Context_save_fp (Context_Control_fp **fp_context_ptr) |
---|
167 | { |
---|
168 | Context_Control_fp *fp; |
---|
169 | |
---|
170 | fp = *fp_context_ptr; |
---|
171 | |
---|
172 | *fp = _fpCCR; |
---|
173 | } |
---|
174 | |
---|
175 | void _CPU_Context_restore_fp (Context_Control_fp **fp_context_ptr) |
---|
176 | { |
---|
177 | Context_Control_fp *fp; |
---|
178 | |
---|
179 | fp = *fp_context_ptr; |
---|
180 | |
---|
181 | _fpCCR = *fp; |
---|
182 | } |
---|
183 | #endif |
---|