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1.1 root 1: /*
2: * CRIS virtual CPU header
3: *
4: * Copyright (c) 2007 AXIS Communications AB
5: * Written by Edgar E. Iglesias
6: *
7: * This library is free software; you can redistribute it and/or
8: * modify it under the terms of the GNU Lesser General Public
9: * License as published by the Free Software Foundation; either
10: * version 2 of the License, or (at your option) any later version.
11: *
12: * This library is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15: * General Public License for more details.
16: *
17: * You should have received a copy of the GNU Lesser General Public
1.1.1.3 ! root 18: * License along with this library; if not, see <http://www.gnu.org/licenses/>.
1.1 root 19: */
20: #ifndef CPU_CRIS_H
21: #define CPU_CRIS_H
22:
23: #define TARGET_LONG_BITS 32
24:
1.1.1.3 ! root 25: #define CPUState struct CPUCRISState
! 26:
1.1 root 27: #include "cpu-defs.h"
28:
29: #define TARGET_HAS_ICE 1
30:
31: #define ELF_MACHINE EM_CRIS
32:
1.1.1.2 root 33: #define EXCP_NMI 1
34: #define EXCP_GURU 2
35: #define EXCP_BUSFAULT 3
36: #define EXCP_IRQ 4
37: #define EXCP_BREAK 5
38:
39: /* Register aliases. R0 - R15 */
40: #define R_FP 8
41: #define R_SP 14
42: #define R_ACR 15
43:
44: /* Support regs, P0 - P15 */
45: #define PR_BZ 0
46: #define PR_VR 1
47: #define PR_PID 2
48: #define PR_SRS 3
49: #define PR_WZ 4
50: #define PR_EXS 5
51: #define PR_EDA 6
52: #define PR_MOF 7
53: #define PR_DZ 8
54: #define PR_EBP 9
55: #define PR_ERP 10
56: #define PR_SRP 11
57: #define PR_NRP 12
58: #define PR_CCS 13
59: #define PR_USP 14
60: #define PR_SPC 15
1.1 root 61:
62: /* CPU flags. */
1.1.1.2 root 63: #define Q_FLAG 0x80000000
64: #define M_FLAG 0x40000000
1.1 root 65: #define S_FLAG 0x200
66: #define R_FLAG 0x100
67: #define P_FLAG 0x80
68: #define U_FLAG 0x40
69: #define I_FLAG 0x20
70: #define X_FLAG 0x10
71: #define N_FLAG 0x08
72: #define Z_FLAG 0x04
73: #define V_FLAG 0x02
74: #define C_FLAG 0x01
75: #define ALU_FLAGS 0x1F
76:
77: /* Condition codes. */
78: #define CC_CC 0
79: #define CC_CS 1
80: #define CC_NE 2
81: #define CC_EQ 3
82: #define CC_VC 4
83: #define CC_VS 5
84: #define CC_PL 6
85: #define CC_MI 7
86: #define CC_LS 8
87: #define CC_HI 9
88: #define CC_GE 10
89: #define CC_LT 11
90: #define CC_GT 12
91: #define CC_LE 13
92: #define CC_A 14
93: #define CC_P 15
94:
95: #define NB_MMU_MODES 2
96:
97: typedef struct CPUCRISState {
98: uint32_t regs[16];
1.1.1.2 root 99: /* P0 - P15 are referred to as special registers in the docs. */
1.1 root 100: uint32_t pregs[16];
1.1.1.2 root 101:
102: /* Pseudo register for the PC. Not directly accessable on CRIS. */
1.1 root 103: uint32_t pc;
104:
1.1.1.2 root 105: /* Pseudo register for the kernel stack. */
106: uint32_t ksp;
1.1 root 107:
1.1.1.2 root 108: /* Branch. */
109: int dslot;
110: int btaken;
111: uint32_t btarget;
1.1 root 112:
113: /* Condition flag tracking. */
114: uint32_t cc_op;
115: uint32_t cc_mask;
116: uint32_t cc_dest;
117: uint32_t cc_src;
118: uint32_t cc_result;
119: /* size of the operation, 1 = byte, 2 = word, 4 = dword. */
120: int cc_size;
1.1.1.2 root 121: /* X flag at the time of cc snapshot. */
1.1 root 122: int cc_x;
123:
1.1.1.2 root 124: int interrupt_vector;
125: int fault_vector;
126: int trap_vector;
127:
128: /* FIXME: add a check in the translator to avoid writing to support
129: register sets beyond the 4th. The ISA allows up to 256! but in
130: practice there is no core that implements more than 4.
131:
132: Support function registers are used to control units close to the
133: core. Accesses do not pass down the normal hierarchy.
134: */
135: uint32_t sregs[4][16];
136:
137: /* Linear feedback shift reg in the mmu. Used to provide pseudo
138: randomness for the 'hint' the mmu gives to sw for chosing valid
139: sets on TLB refills. */
140: uint32_t mmu_rand_lfsr;
1.1 root 141:
1.1.1.2 root 142: /*
143: * We just store the stores to the tlbset here for later evaluation
144: * when the hw needs access to them.
145: *
146: * One for I and another for D.
147: */
1.1 root 148: struct
149: {
1.1.1.2 root 150: uint32_t hi;
151: uint32_t lo;
152: } tlbsets[2][4][16];
1.1 root 153:
154: CPU_COMMON
155: } CPUCRISState;
156:
157: CPUCRISState *cpu_cris_init(const char *cpu_model);
158: int cpu_cris_exec(CPUCRISState *s);
159: void cpu_cris_close(CPUCRISState *s);
160: void do_interrupt(CPUCRISState *env);
161: /* you can call this signal handler from your SIGBUS and SIGSEGV
162: signal handlers to inform the virtual CPU of exceptions. non zero
163: is returned if the signal was handled by the virtual CPU. */
164: int cpu_cris_signal_handler(int host_signum, void *pinfo,
165: void *puc);
166:
167: enum {
168: CC_OP_DYNAMIC, /* Use env->cc_op */
169: CC_OP_FLAGS,
170: CC_OP_CMP,
171: CC_OP_MOVE,
172: CC_OP_ADD,
173: CC_OP_ADDC,
174: CC_OP_MCP,
175: CC_OP_ADDU,
176: CC_OP_SUB,
177: CC_OP_SUBU,
178: CC_OP_NEG,
179: CC_OP_BTST,
180: CC_OP_MULS,
181: CC_OP_MULU,
182: CC_OP_DSTEP,
183: CC_OP_BOUND,
184:
185: CC_OP_OR,
186: CC_OP_AND,
187: CC_OP_XOR,
188: CC_OP_LSL,
189: CC_OP_LSR,
190: CC_OP_ASR,
191: CC_OP_LZ
192: };
193:
194: /* CRIS uses 8k pages. */
195: #define TARGET_PAGE_BITS 13
1.1.1.2 root 196: #define MMAP_SHIFT TARGET_PAGE_BITS
1.1 root 197:
198: #define cpu_init cpu_cris_init
199: #define cpu_exec cpu_cris_exec
200: #define cpu_gen_code cpu_cris_gen_code
201: #define cpu_signal_handler cpu_cris_signal_handler
202:
1.1.1.2 root 203: #define CPU_SAVE_VERSION 1
204:
1.1 root 205: /* MMU modes definitions */
206: #define MMU_MODE0_SUFFIX _kernel
207: #define MMU_MODE1_SUFFIX _user
208: #define MMU_USER_IDX 1
209: static inline int cpu_mmu_index (CPUState *env)
210: {
1.1.1.2 root 211: return !!(env->pregs[PR_CCS] & U_FLAG);
1.1 root 212: }
213:
1.1.1.2 root 214: int cpu_cris_handle_mmu_fault(CPUState *env, target_ulong address, int rw,
215: int mmu_idx, int is_softmmu);
1.1 root 216:
1.1.1.2 root 217: #if defined(CONFIG_USER_ONLY)
218: static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
219: {
220: if (newsp)
221: env->regs[14] = newsp;
222: env->regs[10] = 0;
223: }
224: #endif
1.1 root 225:
1.1.1.2 root 226: static inline void cpu_set_tls(CPUCRISState *env, target_ulong newtls)
227: {
228: env->pregs[PR_PID] = (env->pregs[PR_PID] & 0xff) | newtls;
229: }
230:
231: /* Support function regs. */
1.1 root 232: #define SFR_RW_GC_CFG 0][0
1.1.1.2 root 233: #define SFR_RW_MM_CFG env->pregs[PR_SRS]][0
234: #define SFR_RW_MM_KBASE_LO env->pregs[PR_SRS]][1
235: #define SFR_RW_MM_KBASE_HI env->pregs[PR_SRS]][2
236: #define SFR_R_MM_CAUSE env->pregs[PR_SRS]][3
237: #define SFR_RW_MM_TLB_SEL env->pregs[PR_SRS]][4
238: #define SFR_RW_MM_TLB_LO env->pregs[PR_SRS]][5
239: #define SFR_RW_MM_TLB_HI env->pregs[PR_SRS]][6
240:
241: #include "cpu-all.h"
242: #include "exec-all.h"
243:
244: static inline void cpu_pc_from_tb(CPUState *env, TranslationBlock *tb)
245: {
246: env->pc = tb->pc;
247: }
248:
249: static inline void cpu_get_tb_cpu_state(CPUState *env, target_ulong *pc,
250: target_ulong *cs_base, int *flags)
251: {
252: *pc = env->pc;
253: *cs_base = 0;
254: *flags = env->dslot |
255: (env->pregs[PR_CCS] & (S_FLAG | P_FLAG | U_FLAG | X_FLAG));
256: }
1.1 root 257:
258: #endif
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