4 * Copyright (c) 2016-2020 Michael Rolnik
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see
18 * <http://www.gnu.org/licenses/lgpl-2.1.html>
21 #ifndef QEMU_AVR_CPU_H
22 #define QEMU_AVR_CPU_H
25 #include "exec/cpu-defs.h"
27 #ifdef CONFIG_USER_ONLY
28 #error "AVR 8-bit does not support user mode"
31 #define CPU_RESOLVING_TYPE TYPE_AVR_CPU
33 #define TCG_GUEST_DEFAULT_MO 0
36 * AVR has two memory spaces, data & code.
37 * e.g. both have 0 address
38 * ST/LD instructions access data space
39 * LPM/SPM and instruction fetching access code memory space
41 #define MMU_CODE_IDX 0
42 #define MMU_DATA_IDX 1
45 #define EXCP_INT(n) (EXCP_RESET + (n) + 1)
47 /* Number of CPU registers */
48 #define NUMBER_OF_CPU_REGISTERS 32
49 /* Number of IO registers accessible by ld/st/in/out */
50 #define NUMBER_OF_IO_REGISTERS 64
53 * Offsets of AVR memory regions in host memory space.
55 * This is needed because the AVR has separate code and data address
56 * spaces that both have start from zero but have to go somewhere in
59 * It's also useful to know where some things are, like the IO registers.
61 /* Flash program memory */
62 #define OFFSET_CODE 0x00000000
63 /* CPU registers, IO registers, and SRAM */
64 #define OFFSET_DATA 0x00800000
65 /* CPU registers specifically, these are mapped at the start of data */
66 #define OFFSET_CPU_REGISTERS OFFSET_DATA
68 * IO registers, including status register, stack pointer, and memory
69 * mapped peripherals, mapped just after CPU registers
71 #define OFFSET_IO_REGISTERS (OFFSET_DATA + NUMBER_OF_CPU_REGISTERS)
73 typedef enum AVRFeature
{
76 AVR_FEATURE_1_BYTE_PC
,
77 AVR_FEATURE_2_BYTE_PC
,
78 AVR_FEATURE_3_BYTE_PC
,
80 AVR_FEATURE_1_BYTE_SP
,
81 AVR_FEATURE_2_BYTE_SP
,
85 AVR_FEATURE_RMW
, /* Read Modify Write - XCH LAC LAS LAT */
87 AVR_FEATURE_EIJMP_EICALL
,
88 AVR_FEATURE_IJMP_ICALL
,
91 AVR_FEATURE_ADIW_SBIW
,
109 typedef struct CPUArchState
{
110 uint32_t pc_w
; /* 0x003fffff up to 22 bits */
112 uint32_t sregC
; /* 0x00000001 1 bit */
113 uint32_t sregZ
; /* 0x00000001 1 bit */
114 uint32_t sregN
; /* 0x00000001 1 bit */
115 uint32_t sregV
; /* 0x00000001 1 bit */
116 uint32_t sregS
; /* 0x00000001 1 bit */
117 uint32_t sregH
; /* 0x00000001 1 bit */
118 uint32_t sregT
; /* 0x00000001 1 bit */
119 uint32_t sregI
; /* 0x00000001 1 bit */
121 uint32_t rampD
; /* 0x00ff0000 8 bits */
122 uint32_t rampX
; /* 0x00ff0000 8 bits */
123 uint32_t rampY
; /* 0x00ff0000 8 bits */
124 uint32_t rampZ
; /* 0x00ff0000 8 bits */
125 uint32_t eind
; /* 0x00ff0000 8 bits */
127 uint32_t r
[NUMBER_OF_CPU_REGISTERS
]; /* 8 bits each */
128 uint32_t sp
; /* 16 bits */
130 uint32_t skip
; /* if set skip instruction */
132 uint64_t intsrc
; /* interrupt sources */
133 bool fullacc
; /* CPU/MEM if true MEM only otherwise */
149 /* Initial value of stack pointer */
155 * @parent_realize: The parent class' realize handler.
156 * @parent_phases: The parent class' reset phase handlers.
161 CPUClass parent_class
;
163 DeviceRealize parent_realize
;
164 ResettablePhases parent_phases
;
167 extern const struct VMStateDescription vms_avr_cpu
;
169 void avr_cpu_do_interrupt(CPUState
*cpu
);
170 bool avr_cpu_exec_interrupt(CPUState
*cpu
, int int_req
);
171 hwaddr
avr_cpu_get_phys_page_debug(CPUState
*cpu
, vaddr addr
);
172 int avr_cpu_gdb_read_register(CPUState
*cpu
, GByteArray
*buf
, int reg
);
173 int avr_cpu_gdb_write_register(CPUState
*cpu
, uint8_t *buf
, int reg
);
174 int avr_print_insn(bfd_vma addr
, disassemble_info
*info
);
175 vaddr
avr_cpu_gdb_adjust_breakpoint(CPUState
*cpu
, vaddr addr
);
177 static inline int avr_feature(CPUAVRState
*env
, AVRFeature feature
)
179 return (env
->features
& (1U << feature
)) != 0;
182 static inline void set_avr_feature(CPUAVRState
*env
, int feature
)
184 env
->features
|= (1U << feature
);
187 void avr_cpu_tcg_init(void);
189 int cpu_avr_exec(CPUState
*cpu
);
192 TB_FLAGS_FULL_ACCESS
= 1,
196 static inline void cpu_get_tb_cpu_state(CPUAVRState
*env
, vaddr
*pc
,
197 uint64_t *cs_base
, uint32_t *pflags
)
205 flags
|= TB_FLAGS_FULL_ACCESS
;
208 flags
|= TB_FLAGS_SKIP
;
214 static inline int cpu_interrupts_enabled(CPUAVRState
*env
)
216 return env
->sregI
!= 0;
219 static inline uint8_t cpu_get_sreg(CPUAVRState
*env
)
221 return (env
->sregC
) << 0
231 static inline void cpu_set_sreg(CPUAVRState
*env
, uint8_t sreg
)
233 env
->sregC
= (sreg
>> 0) & 0x01;
234 env
->sregZ
= (sreg
>> 1) & 0x01;
235 env
->sregN
= (sreg
>> 2) & 0x01;
236 env
->sregV
= (sreg
>> 3) & 0x01;
237 env
->sregS
= (sreg
>> 4) & 0x01;
238 env
->sregH
= (sreg
>> 5) & 0x01;
239 env
->sregT
= (sreg
>> 6) & 0x01;
240 env
->sregI
= (sreg
>> 7) & 0x01;
243 bool avr_cpu_tlb_fill(CPUState
*cs
, vaddr address
, int size
,
244 MMUAccessType access_type
, int mmu_idx
,
245 bool probe
, uintptr_t retaddr
);
247 #include "exec/cpu-all.h"
249 #endif /* QEMU_AVR_CPU_H */