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comparison packages/hal/powerpc/ppc40x/current/src/var_misc.c @ 134:d2f49caf9e38 ecos-sw-2000-11-03

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Merge from eCos master repository on 2000-11-03-09:00:49-GMT
author jlarmour
date Fri, 03 Nov 2000 21:17:40 +0000
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children a9ac27ec7abc
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133:98d71f4d8243 134:d2f49caf9e38
1 //==========================================================================
2 //
3 // var_misc.c
4 //
5 // HAL implementation miscellaneous functions
6 //
7 //==========================================================================
8 //####COPYRIGHTBEGIN####
9 //
10 // -------------------------------------------
11 // The contents of this file are subject to the Red Hat eCos Public License
12 // Version 1.1 (the "License"); you may not use this file except in
13 // compliance with the License. You may obtain a copy of the License at
14 // http://www.redhat.com/
15 //
16 // Software distributed under the License is distributed on an "AS IS"
17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
18 // License for the specific language governing rights and limitations under
19 // the License.
20 //
21 // The Original Code is eCos - Embedded Configurable Operating System,
22 // released September 30, 1998.
23 //
24 // The Initial Developer of the Original Code is Red Hat.
25 // Portions created by Red Hat are
26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
27 // All Rights Reserved.
28 // -------------------------------------------
29 //
30 //####COPYRIGHTEND####
31 //==========================================================================
32 //#####DESCRIPTIONBEGIN####
33 //
34 // Author(s): jskov
35 // Contributors: jskov
36 // Date: 2000-02-04
37 // Purpose: HAL miscellaneous functions
38 // Description: This file contains miscellaneous functions provided by the
39 // HAL.
40 //
41 //####DESCRIPTIONEND####
42 //
43 //==========================================================================
44
45 #include <pkgconf/hal.h>
46
47 #define CYGARC_HAL_COMMON_EXPORT_CPU_MACROS
48 #include <cyg/hal/ppc_regs.h>
49 #include <cyg/infra/cyg_type.h>
50
51 #include <cyg/hal/hal_mem.h>
52
53 //--------------------------------------------------------------------------
54 void hal_variant_init(void)
55 {
56 }
57
58
59 //--------------------------------------------------------------------------
60 // Variant specific idle thread action.
61 bool
62 hal_variant_idle_thread_action( cyg_uint32 count )
63 {
64 // Let architecture idle thread action run
65 return true;
66 }
67
68 //---------------------------------------------------------------------------
69 // Use MMU resources to map memory regions.
70 // Takes and returns an int used to ID the MMU resource to use. This ID
71 // is increased as resources are used and should be used for subsequent
72 // invocations.
73 //
74 // The PPC4xx CPUs do not have BATs. Fortunately we don't currently
75 // use the MMU, so we can simulate BATs by using the TLBs.
76 int
77 cyg_hal_map_memory (int id, CYG_ADDRESS virt, CYG_ADDRESS phys,
78 cyg_int32 size, cyg_uint8 flags)
79 {
80 cyg_uint32 epn, rpn;
81 int sv, lv, max_tlbs;
82
83 // There are 64 TLBs.
84 max_tlbs = 64;
85
86 // Use the smallest "size" value which is big enough (round up)
87 for (sv = 0, lv = 0x400; sv < 8; sv++, lv <<= 2) {
88 if (lv >= size) break;
89 }
90
91 // Note: the process ID comes from the PID register (always 0)
92 epn = (virt & M_EPN_EPNMASK) | M_EPN_EV | M_EPN_SIZE(sv);
93 rpn = (phys & M_RPN_RPNMASK) | M_RPN_EX | M_RPN_WR;
94
95 if (flags & CYGARC_MEMDESC_CI) {
96 rpn |= M_RPN_I;
97 }
98
99 if (flags & CYGARC_MEMDESC_GUARDED)
100 rpn |= M_RPN_G;
101
102 CYGARC_TLBWE(id, epn, rpn);
103 id++;
104
105 // Make caches default disabled when MMU is disabled.
106
107 return id;
108 }
109
110
111 // Initialize MMU to a sane (NOP) state.
112 //
113 // Initialize TLBs with 0, Valid bits unset.
114 void
115 cyg_hal_clear_MMU (void)
116 {
117 cyg_uint32 tlbhi = 0;
118 cyg_uint32 tlblo = 0;
119 int id, max_tlbs;
120 cyg_uint32 tlb[64][2];
121
122 // There are 64 TLBs.
123 max_tlbs = 64;
124
125 CYGARC_MTSPR (M_PID, 0);
126
127 for (id = 0; id < max_tlbs; id++) {
128 CYGARC_TLBRE(id, tlb[id][0], tlb[id][1]);
129 CYGARC_TLBWE(id, tlbhi, tlblo);
130 }
131
132 // Make caches default disabled when MMU is disabled.
133 }
134
135 //--------------------------------------------------------------------------
136 // End of var_misc.c