root / target-microblaze / op_helper.c @ 153859be
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1 | 4acb54ba | Edgar E. Iglesias | /*
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2 | 4acb54ba | Edgar E. Iglesias | * Microblaze helper routines.
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3 | 4acb54ba | Edgar E. Iglesias | *
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4 | 4acb54ba | Edgar E. Iglesias | * Copyright (c) 2009 Edgar E. Iglesias <edgar.iglesias@gmail.com>.
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5 | 4acb54ba | Edgar E. Iglesias | *
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6 | 4acb54ba | Edgar E. Iglesias | * This library is free software; you can redistribute it and/or
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7 | 4acb54ba | Edgar E. Iglesias | * modify it under the terms of the GNU Lesser General Public
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8 | 4acb54ba | Edgar E. Iglesias | * License as published by the Free Software Foundation; either
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9 | 4acb54ba | Edgar E. Iglesias | * version 2 of the License, or (at your option) any later version.
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10 | 4acb54ba | Edgar E. Iglesias | *
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11 | 4acb54ba | Edgar E. Iglesias | * This library is distributed in the hope that it will be useful,
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12 | 4acb54ba | Edgar E. Iglesias | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | 4acb54ba | Edgar E. Iglesias | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | 4acb54ba | Edgar E. Iglesias | * Lesser General Public License for more details.
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15 | 4acb54ba | Edgar E. Iglesias | *
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16 | 4acb54ba | Edgar E. Iglesias | * You should have received a copy of the GNU Lesser General Public
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17 | 4acb54ba | Edgar E. Iglesias | * License along with this library; if not, write to the Free Software
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18 | 4acb54ba | Edgar E. Iglesias | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA
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19 | 4acb54ba | Edgar E. Iglesias | */
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20 | 4acb54ba | Edgar E. Iglesias | |
21 | 4acb54ba | Edgar E. Iglesias | #include <assert.h> |
22 | 4acb54ba | Edgar E. Iglesias | #include "exec.h" |
23 | 4acb54ba | Edgar E. Iglesias | #include "helper.h" |
24 | 4acb54ba | Edgar E. Iglesias | #include "host-utils.h" |
25 | 4acb54ba | Edgar E. Iglesias | |
26 | 4acb54ba | Edgar E. Iglesias | #define D(x)
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27 | 4acb54ba | Edgar E. Iglesias | |
28 | 4acb54ba | Edgar E. Iglesias | #if !defined(CONFIG_USER_ONLY)
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29 | 4acb54ba | Edgar E. Iglesias | #define MMUSUFFIX _mmu
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30 | 4acb54ba | Edgar E. Iglesias | #define SHIFT 0 |
31 | 4acb54ba | Edgar E. Iglesias | #include "softmmu_template.h" |
32 | 4acb54ba | Edgar E. Iglesias | #define SHIFT 1 |
33 | 4acb54ba | Edgar E. Iglesias | #include "softmmu_template.h" |
34 | 4acb54ba | Edgar E. Iglesias | #define SHIFT 2 |
35 | 4acb54ba | Edgar E. Iglesias | #include "softmmu_template.h" |
36 | 4acb54ba | Edgar E. Iglesias | #define SHIFT 3 |
37 | 4acb54ba | Edgar E. Iglesias | #include "softmmu_template.h" |
38 | 4acb54ba | Edgar E. Iglesias | |
39 | 4acb54ba | Edgar E. Iglesias | /* Try to fill the TLB and return an exception if error. If retaddr is
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40 | 4acb54ba | Edgar E. Iglesias | NULL, it means that the function was called in C code (i.e. not
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41 | 4acb54ba | Edgar E. Iglesias | from generated code or from helper.c) */
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42 | 4acb54ba | Edgar E. Iglesias | /* XXX: fix it to restore all registers */
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43 | 4acb54ba | Edgar E. Iglesias | void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr) |
44 | 4acb54ba | Edgar E. Iglesias | { |
45 | 4acb54ba | Edgar E. Iglesias | TranslationBlock *tb; |
46 | 4acb54ba | Edgar E. Iglesias | CPUState *saved_env; |
47 | 4acb54ba | Edgar E. Iglesias | unsigned long pc; |
48 | 4acb54ba | Edgar E. Iglesias | int ret;
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49 | 4acb54ba | Edgar E. Iglesias | |
50 | 4acb54ba | Edgar E. Iglesias | /* XXX: hack to restore env in all cases, even if not called from
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51 | 4acb54ba | Edgar E. Iglesias | generated code */
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52 | 4acb54ba | Edgar E. Iglesias | saved_env = env; |
53 | 4acb54ba | Edgar E. Iglesias | env = cpu_single_env; |
54 | 4acb54ba | Edgar E. Iglesias | |
55 | 4acb54ba | Edgar E. Iglesias | ret = cpu_mb_handle_mmu_fault(env, addr, is_write, mmu_idx, 1);
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56 | 4acb54ba | Edgar E. Iglesias | if (unlikely(ret)) {
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57 | 4acb54ba | Edgar E. Iglesias | if (retaddr) {
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58 | 4acb54ba | Edgar E. Iglesias | /* now we have a real cpu fault */
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59 | 4acb54ba | Edgar E. Iglesias | pc = (unsigned long)retaddr; |
60 | 4acb54ba | Edgar E. Iglesias | tb = tb_find_pc(pc); |
61 | 4acb54ba | Edgar E. Iglesias | if (tb) {
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62 | 4acb54ba | Edgar E. Iglesias | /* the PC is inside the translated code. It means that we have
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63 | 4acb54ba | Edgar E. Iglesias | a virtual CPU fault */
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64 | 4acb54ba | Edgar E. Iglesias | cpu_restore_state(tb, env, pc, NULL);
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65 | 4acb54ba | Edgar E. Iglesias | } |
66 | 4acb54ba | Edgar E. Iglesias | } |
67 | 4acb54ba | Edgar E. Iglesias | cpu_loop_exit(); |
68 | 4acb54ba | Edgar E. Iglesias | } |
69 | 4acb54ba | Edgar E. Iglesias | env = saved_env; |
70 | 4acb54ba | Edgar E. Iglesias | } |
71 | 4acb54ba | Edgar E. Iglesias | #endif
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72 | 4acb54ba | Edgar E. Iglesias | |
73 | 4acb54ba | Edgar E. Iglesias | void helper_raise_exception(uint32_t index)
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74 | 4acb54ba | Edgar E. Iglesias | { |
75 | 4acb54ba | Edgar E. Iglesias | env->exception_index = index; |
76 | 4acb54ba | Edgar E. Iglesias | cpu_loop_exit(); |
77 | 4acb54ba | Edgar E. Iglesias | } |
78 | 4acb54ba | Edgar E. Iglesias | |
79 | 4acb54ba | Edgar E. Iglesias | void helper_debug(void) |
80 | 4acb54ba | Edgar E. Iglesias | { |
81 | 4acb54ba | Edgar E. Iglesias | int i;
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82 | 4acb54ba | Edgar E. Iglesias | |
83 | 4acb54ba | Edgar E. Iglesias | qemu_log("PC=%8.8x\n", env->sregs[SR_PC]);
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84 | 4acb54ba | Edgar E. Iglesias | for (i = 0; i < 32; i++) { |
85 | 4acb54ba | Edgar E. Iglesias | qemu_log("r%2.2d=%8.8x ", i, env->regs[i]);
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86 | 4acb54ba | Edgar E. Iglesias | if ((i + 1) % 4 == 0) |
87 | 4acb54ba | Edgar E. Iglesias | qemu_log("\n");
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88 | 4acb54ba | Edgar E. Iglesias | } |
89 | 4acb54ba | Edgar E. Iglesias | qemu_log("\n\n");
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90 | 4acb54ba | Edgar E. Iglesias | } |
91 | 4acb54ba | Edgar E. Iglesias | |
92 | 4acb54ba | Edgar E. Iglesias | static inline uint32_t compute_carry(uint32_t a, uint32_t b, uint32_t cin) |
93 | 4acb54ba | Edgar E. Iglesias | { |
94 | 4acb54ba | Edgar E. Iglesias | uint32_t cout = 0;
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95 | 4acb54ba | Edgar E. Iglesias | |
96 | 4acb54ba | Edgar E. Iglesias | if ((b == ~0) && cin) |
97 | 4acb54ba | Edgar E. Iglesias | cout = 1;
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98 | 4acb54ba | Edgar E. Iglesias | else if ((~0 - a) < (b + cin)) |
99 | 4acb54ba | Edgar E. Iglesias | cout = 1;
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100 | 4acb54ba | Edgar E. Iglesias | return cout;
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101 | 4acb54ba | Edgar E. Iglesias | } |
102 | 4acb54ba | Edgar E. Iglesias | |
103 | 4acb54ba | Edgar E. Iglesias | uint32_t helper_cmp(uint32_t a, uint32_t b) |
104 | 4acb54ba | Edgar E. Iglesias | { |
105 | 4acb54ba | Edgar E. Iglesias | uint32_t t; |
106 | 4acb54ba | Edgar E. Iglesias | |
107 | 4acb54ba | Edgar E. Iglesias | t = b + ~a + 1;
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108 | 4acb54ba | Edgar E. Iglesias | if ((b & 0x80000000) ^ (a & 0x80000000)) |
109 | 4acb54ba | Edgar E. Iglesias | t = (t & 0x7fffffff) | (b & 0x80000000); |
110 | 4acb54ba | Edgar E. Iglesias | return t;
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111 | 4acb54ba | Edgar E. Iglesias | } |
112 | 4acb54ba | Edgar E. Iglesias | |
113 | 4acb54ba | Edgar E. Iglesias | uint32_t helper_cmpu(uint32_t a, uint32_t b) |
114 | 4acb54ba | Edgar E. Iglesias | { |
115 | 4acb54ba | Edgar E. Iglesias | uint32_t t; |
116 | 4acb54ba | Edgar E. Iglesias | |
117 | 4acb54ba | Edgar E. Iglesias | t = b + ~a + 1;
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118 | 4acb54ba | Edgar E. Iglesias | if ((b & 0x80000000) ^ (a & 0x80000000)) |
119 | 4acb54ba | Edgar E. Iglesias | t = (t & 0x7fffffff) | (a & 0x80000000); |
120 | 4acb54ba | Edgar E. Iglesias | return t;
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121 | 4acb54ba | Edgar E. Iglesias | } |
122 | 4acb54ba | Edgar E. Iglesias | |
123 | 4acb54ba | Edgar E. Iglesias | uint32_t helper_addkc(uint32_t a, uint32_t b, uint32_t k, uint32_t c) |
124 | 4acb54ba | Edgar E. Iglesias | { |
125 | 4acb54ba | Edgar E. Iglesias | uint32_t d, cf = 0, ncf;
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126 | 4acb54ba | Edgar E. Iglesias | |
127 | 4acb54ba | Edgar E. Iglesias | if (c)
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128 | 4acb54ba | Edgar E. Iglesias | cf = env->sregs[SR_MSR] >> 31;
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129 | 4acb54ba | Edgar E. Iglesias | assert(cf == 0 || cf == 1); |
130 | 4acb54ba | Edgar E. Iglesias | d = a + b + cf; |
131 | 4acb54ba | Edgar E. Iglesias | |
132 | 4acb54ba | Edgar E. Iglesias | if (!k) {
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133 | 4acb54ba | Edgar E. Iglesias | ncf = compute_carry(a, b, cf); |
134 | 4acb54ba | Edgar E. Iglesias | assert(ncf == 0 || ncf == 1); |
135 | 4acb54ba | Edgar E. Iglesias | if (ncf)
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136 | 4acb54ba | Edgar E. Iglesias | env->sregs[SR_MSR] |= MSR_C | MSR_CC; |
137 | 4acb54ba | Edgar E. Iglesias | else
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138 | 4acb54ba | Edgar E. Iglesias | env->sregs[SR_MSR] &= ~(MSR_C | MSR_CC); |
139 | 4acb54ba | Edgar E. Iglesias | } |
140 | 4acb54ba | Edgar E. Iglesias | D(qemu_log("%x = %x + %x cf=%d ncf=%d k=%d c=%d\n",
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141 | 4acb54ba | Edgar E. Iglesias | d, a, b, cf, ncf, k, c)); |
142 | 4acb54ba | Edgar E. Iglesias | return d;
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143 | 4acb54ba | Edgar E. Iglesias | } |
144 | 4acb54ba | Edgar E. Iglesias | |
145 | 4acb54ba | Edgar E. Iglesias | uint32_t helper_subkc(uint32_t a, uint32_t b, uint32_t k, uint32_t c) |
146 | 4acb54ba | Edgar E. Iglesias | { |
147 | 4acb54ba | Edgar E. Iglesias | uint32_t d, cf = 1, ncf;
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148 | 4acb54ba | Edgar E. Iglesias | |
149 | 4acb54ba | Edgar E. Iglesias | if (c)
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150 | 4acb54ba | Edgar E. Iglesias | cf = env->sregs[SR_MSR] >> 31;
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151 | 4acb54ba | Edgar E. Iglesias | assert(cf == 0 || cf == 1); |
152 | 4acb54ba | Edgar E. Iglesias | d = b + ~a + cf; |
153 | 4acb54ba | Edgar E. Iglesias | |
154 | 4acb54ba | Edgar E. Iglesias | if (!k) {
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155 | 4acb54ba | Edgar E. Iglesias | ncf = compute_carry(b, ~a, cf); |
156 | 4acb54ba | Edgar E. Iglesias | assert(ncf == 0 || ncf == 1); |
157 | 4acb54ba | Edgar E. Iglesias | if (ncf)
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158 | 4acb54ba | Edgar E. Iglesias | env->sregs[SR_MSR] |= MSR_C | MSR_CC; |
159 | 4acb54ba | Edgar E. Iglesias | else
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160 | 4acb54ba | Edgar E. Iglesias | env->sregs[SR_MSR] &= ~(MSR_C | MSR_CC); |
161 | 4acb54ba | Edgar E. Iglesias | } |
162 | 4acb54ba | Edgar E. Iglesias | D(qemu_log("%x = %x + %x cf=%d ncf=%d k=%d c=%d\n",
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163 | 4acb54ba | Edgar E. Iglesias | d, a, b, cf, ncf, k, c)); |
164 | 4acb54ba | Edgar E. Iglesias | return d;
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165 | 4acb54ba | Edgar E. Iglesias | } |
166 | 4acb54ba | Edgar E. Iglesias | |
167 | 4acb54ba | Edgar E. Iglesias | static inline int div_prepare(uint32_t a, uint32_t b) |
168 | 4acb54ba | Edgar E. Iglesias | { |
169 | 4acb54ba | Edgar E. Iglesias | if (b == 0) { |
170 | 4acb54ba | Edgar E. Iglesias | env->sregs[SR_MSR] |= MSR_DZ; |
171 | 4acb54ba | Edgar E. Iglesias | /* FIXME: Raise the div by zero exception. */
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172 | 4acb54ba | Edgar E. Iglesias | return 0; |
173 | 4acb54ba | Edgar E. Iglesias | } |
174 | 4acb54ba | Edgar E. Iglesias | env->sregs[SR_MSR] &= ~MSR_DZ; |
175 | 4acb54ba | Edgar E. Iglesias | return 1; |
176 | 4acb54ba | Edgar E. Iglesias | } |
177 | 4acb54ba | Edgar E. Iglesias | |
178 | 4acb54ba | Edgar E. Iglesias | uint32_t helper_divs(uint32_t a, uint32_t b) |
179 | 4acb54ba | Edgar E. Iglesias | { |
180 | 4acb54ba | Edgar E. Iglesias | if (!div_prepare(a, b))
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181 | 4acb54ba | Edgar E. Iglesias | return 0; |
182 | 4acb54ba | Edgar E. Iglesias | return (int32_t)a / (int32_t)b;
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183 | 4acb54ba | Edgar E. Iglesias | } |
184 | 4acb54ba | Edgar E. Iglesias | |
185 | 4acb54ba | Edgar E. Iglesias | uint32_t helper_divu(uint32_t a, uint32_t b) |
186 | 4acb54ba | Edgar E. Iglesias | { |
187 | 4acb54ba | Edgar E. Iglesias | if (!div_prepare(a, b))
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188 | 4acb54ba | Edgar E. Iglesias | return 0; |
189 | 4acb54ba | Edgar E. Iglesias | return a / b;
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190 | 4acb54ba | Edgar E. Iglesias | } |
191 | 4acb54ba | Edgar E. Iglesias | |
192 | 4acb54ba | Edgar E. Iglesias | uint32_t helper_pcmpbf(uint32_t a, uint32_t b) |
193 | 4acb54ba | Edgar E. Iglesias | { |
194 | 4acb54ba | Edgar E. Iglesias | unsigned int i; |
195 | 4acb54ba | Edgar E. Iglesias | uint32_t mask = 0xff000000;
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196 | 4acb54ba | Edgar E. Iglesias | |
197 | 4acb54ba | Edgar E. Iglesias | for (i = 0; i < 4; i++) { |
198 | 4acb54ba | Edgar E. Iglesias | if ((a & mask) == (b & mask))
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199 | 4acb54ba | Edgar E. Iglesias | return i + 1; |
200 | 4acb54ba | Edgar E. Iglesias | mask >>= 8;
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201 | 4acb54ba | Edgar E. Iglesias | } |
202 | 4acb54ba | Edgar E. Iglesias | return 0; |
203 | 4acb54ba | Edgar E. Iglesias | } |
204 | 4acb54ba | Edgar E. Iglesias | |
205 | 4acb54ba | Edgar E. Iglesias | #if !defined(CONFIG_USER_ONLY)
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206 | 4acb54ba | Edgar E. Iglesias | /* Writes/reads to the MMU's special regs end up here. */
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207 | 4acb54ba | Edgar E. Iglesias | uint32_t helper_mmu_read(uint32_t rn) |
208 | 4acb54ba | Edgar E. Iglesias | { |
209 | 4acb54ba | Edgar E. Iglesias | return mmu_read(env, rn);
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210 | 4acb54ba | Edgar E. Iglesias | } |
211 | 4acb54ba | Edgar E. Iglesias | |
212 | 4acb54ba | Edgar E. Iglesias | void helper_mmu_write(uint32_t rn, uint32_t v)
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213 | 4acb54ba | Edgar E. Iglesias | { |
214 | 4acb54ba | Edgar E. Iglesias | mmu_write(env, rn, v); |
215 | 4acb54ba | Edgar E. Iglesias | } |
216 | 4acb54ba | Edgar E. Iglesias | #endif |