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a541f297 FB |
1 | /* |
2 | * QEMU generic PPC hardware System Emulator | |
3 | * | |
4 | * Copyright (c) 2003-2004 Jocelyn Mayer | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
a541f297 FB |
24 | #include "vl.h" |
25 | ||
26 | void ppc_prep_init (int ram_size, int vga_ram_size, int boot_device, | |
27 | DisplayState *ds, const char **fd_filename, int snapshot, | |
28 | const char *kernel_filename, const char *kernel_cmdline, | |
29 | const char *initrd_filename); | |
30 | ||
9fddaa0c FB |
31 | /*****************************************************************************/ |
32 | /* PPC time base and decrementer emulation */ | |
33 | //#define DEBUG_TB | |
34 | ||
35 | struct ppc_tb_t { | |
36 | /* Time base management */ | |
37 | int64_t tb_offset; /* Compensation */ | |
38 | uint32_t tb_freq; /* TB frequency */ | |
39 | /* Decrementer management */ | |
40 | uint64_t decr_next; /* Tick for next decr interrupt */ | |
41 | struct QEMUTimer *decr_timer; | |
42 | }; | |
43 | ||
44 | static inline uint64_t cpu_ppc_get_tb (ppc_tb_t *tb_env) | |
45 | { | |
46 | /* TB time in tb periods */ | |
47 | return muldiv64(qemu_get_clock(vm_clock) + tb_env->tb_offset, | |
48 | tb_env->tb_freq, ticks_per_sec); | |
49 | } | |
50 | ||
51 | uint32_t cpu_ppc_load_tbl (CPUState *env) | |
52 | { | |
53 | ppc_tb_t *tb_env = env->tb_env; | |
54 | uint64_t tb; | |
55 | ||
56 | tb = cpu_ppc_get_tb(tb_env); | |
57 | #ifdef DEBUG_TB | |
58 | { | |
59 | static int last_time; | |
60 | int now; | |
61 | now = time(NULL); | |
62 | if (last_time != now) { | |
63 | last_time = now; | |
64 | printf("%s: tb=0x%016lx %d %08lx\n", | |
65 | __func__, tb, now, tb_env->tb_offset); | |
66 | } | |
67 | } | |
68 | #endif | |
69 | ||
70 | return tb & 0xFFFFFFFF; | |
71 | } | |
72 | ||
73 | uint32_t cpu_ppc_load_tbu (CPUState *env) | |
74 | { | |
75 | ppc_tb_t *tb_env = env->tb_env; | |
76 | uint64_t tb; | |
77 | ||
78 | tb = cpu_ppc_get_tb(tb_env); | |
79 | #ifdef DEBUG_TB | |
80 | printf("%s: tb=0x%016lx\n", __func__, tb); | |
81 | #endif | |
82 | return tb >> 32; | |
83 | } | |
84 | ||
85 | static void cpu_ppc_store_tb (ppc_tb_t *tb_env, uint64_t value) | |
86 | { | |
87 | tb_env->tb_offset = muldiv64(value, ticks_per_sec, tb_env->tb_freq) | |
88 | - qemu_get_clock(vm_clock); | |
89 | #ifdef DEBUG_TB | |
90 | printf("%s: tb=0x%016lx offset=%08x\n", __func__, value); | |
91 | #endif | |
92 | } | |
93 | ||
94 | void cpu_ppc_store_tbu (CPUState *env, uint32_t value) | |
95 | { | |
96 | ppc_tb_t *tb_env = env->tb_env; | |
97 | ||
98 | cpu_ppc_store_tb(tb_env, | |
99 | ((uint64_t)value << 32) | cpu_ppc_load_tbl(env)); | |
100 | } | |
101 | ||
102 | void cpu_ppc_store_tbl (CPUState *env, uint32_t value) | |
103 | { | |
104 | ppc_tb_t *tb_env = env->tb_env; | |
105 | ||
106 | cpu_ppc_store_tb(tb_env, | |
107 | ((uint64_t)cpu_ppc_load_tbu(env) << 32) | value); | |
108 | } | |
109 | ||
110 | uint32_t cpu_ppc_load_decr (CPUState *env) | |
111 | { | |
112 | ppc_tb_t *tb_env = env->tb_env; | |
113 | uint32_t decr; | |
114 | ||
115 | decr = muldiv64(tb_env->decr_next - qemu_get_clock(vm_clock), | |
116 | tb_env->tb_freq, ticks_per_sec); | |
117 | #ifdef DEBUG_TB | |
118 | printf("%s: 0x%08x\n", __func__, decr); | |
119 | #endif | |
120 | ||
121 | return decr; | |
122 | } | |
123 | ||
124 | /* When decrementer expires, | |
125 | * all we need to do is generate or queue a CPU exception | |
126 | */ | |
127 | static inline void cpu_ppc_decr_excp (CPUState *env) | |
128 | { | |
129 | /* Raise it */ | |
130 | #ifdef DEBUG_TB | |
131 | printf("raise decrementer exception\n"); | |
132 | #endif | |
133 | cpu_interrupt(env, CPU_INTERRUPT_TIMER); | |
134 | } | |
135 | ||
136 | static void _cpu_ppc_store_decr (CPUState *env, uint32_t decr, | |
137 | uint32_t value, int is_excp) | |
138 | { | |
139 | ppc_tb_t *tb_env = env->tb_env; | |
140 | uint64_t now, next; | |
141 | ||
142 | #ifdef DEBUG_TB | |
143 | printf("%s: 0x%08x => 0x%08x\n", __func__, decr, value); | |
144 | #endif | |
145 | now = qemu_get_clock(vm_clock); | |
146 | next = now + muldiv64(value, ticks_per_sec, tb_env->tb_freq); | |
147 | if (is_excp) | |
148 | next += tb_env->decr_next - now; | |
149 | if (next == now) | |
150 | next++; | |
151 | tb_env->decr_next = next; | |
152 | /* Adjust timer */ | |
153 | qemu_mod_timer(tb_env->decr_timer, next); | |
154 | /* If we set a negative value and the decrementer was positive, | |
155 | * raise an exception. | |
156 | */ | |
157 | if ((value & 0x80000000) && !(decr & 0x80000000)) | |
158 | cpu_ppc_decr_excp(env); | |
159 | } | |
160 | ||
161 | void cpu_ppc_store_decr (CPUState *env, uint32_t value) | |
162 | { | |
163 | _cpu_ppc_store_decr(env, cpu_ppc_load_decr(env), value, 0); | |
164 | } | |
165 | ||
166 | static void cpu_ppc_decr_cb (void *opaque) | |
167 | { | |
168 | _cpu_ppc_store_decr(opaque, 0x00000000, 0xFFFFFFFF, 1); | |
169 | } | |
170 | ||
171 | /* Set up (once) timebase frequency (in Hz) */ | |
172 | ppc_tb_t *cpu_ppc_tb_init (CPUState *env, uint32_t freq) | |
173 | { | |
174 | ppc_tb_t *tb_env; | |
175 | ||
176 | tb_env = qemu_mallocz(sizeof(ppc_tb_t)); | |
177 | if (tb_env == NULL) | |
178 | return NULL; | |
179 | env->tb_env = tb_env; | |
180 | if (tb_env->tb_freq == 0 || 1) { | |
181 | tb_env->tb_freq = freq; | |
182 | /* Create new timer */ | |
183 | tb_env->decr_timer = | |
184 | qemu_new_timer(vm_clock, &cpu_ppc_decr_cb, env); | |
185 | /* There is a bug in 2.4 kernels: | |
186 | * if a decrementer exception is pending when it enables msr_ee, | |
187 | * it's not ready to handle it... | |
188 | */ | |
189 | _cpu_ppc_store_decr(env, 0xFFFFFFFF, 0xFFFFFFFF, 0); | |
190 | } | |
191 | ||
192 | return tb_env; | |
193 | } | |
194 | ||
195 | #if 0 | |
196 | /*****************************************************************************/ | |
197 | /* Handle system reset (for now, just stop emulation) */ | |
198 | void cpu_ppc_reset (CPUState *env) | |
199 | { | |
200 | printf("Reset asked... Stop emulation\n"); | |
201 | abort(); | |
202 | } | |
203 | #endif | |
204 | ||
205 | /*****************************************************************************/ | |
a541f297 FB |
206 | void ppc_init (int ram_size, int vga_ram_size, int boot_device, |
207 | DisplayState *ds, const char **fd_filename, int snapshot, | |
208 | const char *kernel_filename, const char *kernel_cmdline, | |
209 | const char *initrd_filename) | |
210 | { | |
211 | /* For now, only PREP is supported */ | |
212 | return ppc_prep_init(ram_size, vga_ram_size, boot_device, ds, fd_filename, | |
213 | snapshot, kernel_filename, kernel_cmdline, | |
214 | initrd_filename); | |
215 | } |