FilesExpand file tree

 parse-bytecode

/

machine_mem.c

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

103 lines (94 loc) · 4.1 KB

 parse-bytecode

/

machine_mem.c

Copy path

Top

File metadata and controls

• Code
• Blame

103 lines (94 loc) · 4.1 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

101

102

103

/*

* This file is part of the Micro Python project, http://micropython.org/

*

* The MIT License (MIT)

*

* Copyright (c) 2013, 2014 Damien P. George

*

* Permission is hereby granted, free of charge, to any person obtaining a copy

* of this software and associated documentation files (the "Software"), to deal

* in the Software without restriction, including without limitation the rights

* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the Software is

* furnished to do so, subject to the following conditions:

*

* The above copyright notice and this permission notice shall be included in

* all copies or substantial portions of the Software.

*

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

* THE SOFTWARE.

*/

#include "extmod/machine_mem.h"

#include "py/nlr.h"

#if MICROPY_PY_MACHINE

// If you wish to override the functions for mapping the machine_mem read/write

// address, then add a #define for MICROPY_MACHINE_MEM_GET_READ_ADDR and/or

// MICROPY_MACHINE_MEM_GET_WRITE_ADDR in yopur mpconfigport.h. Since the

// prototypes are identical, it is allowable for both of the macros to evaluate

// the to same function.

//

// It is expected that the modmachine.c file for a given port will provide the

// implementations, if the default implementation isn't used.

#if !defined(MICROPY_MACHINE_MEM_GET_READ_ADDR) || !defined(MICROPY_MACHINE_MEM_GET_WRITE_ADDR)

STATIC uintptr_t machine_mem_get_addr(mp_obj_t addr_o, uint align) {

uintptr_t addr = mp_obj_int_get_truncated(addr_o);

if ((addr & (align - 1)) != 0) {

nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "address %08x is not aligned to %d bytes", addr, align));

}

return addr;

}

#if !defined(MICROPY_MACHINE_MEM_GET_READ_ADDR)

#define MICROPY_MACHINE_MEM_GET_READ_ADDR machine_mem_get_addr

#endif

#if !defined(MICROPY_MACHINE_MEM_GET_WRITE_ADDR)

#define MICROPY_MACHINE_MEM_GET_WRITE_ADDR machine_mem_get_addr

#endif

#endif

STATIC void machine_mem_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {

(void)kind;

machine_mem_obj_t *self = MP_OBJ_TO_PTR(self_in);

mp_printf(print, "<%u-bit memory>", 8 * self->elem_size);

}

STATIC mp_obj_t machine_mem_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {

// TODO support slice index to read/write multiple values at once

machine_mem_obj_t *self = MP_OBJ_TO_PTR(self_in);

if (value == MP_OBJ_NULL) {

// delete

return MP_OBJ_NULL; // op not supported

} else if (value == MP_OBJ_SENTINEL) {

// load

uintptr_t addr = MICROPY_MACHINE_MEM_GET_READ_ADDR(index, self->elem_size);

uint32_t val;

switch (self->elem_size) {

case 1: val = (*(uint8_t*)addr); break;

case 2: val = (*(uint16_t*)addr); break;

default: val = (*(uint32_t*)addr); break;

}

return mp_obj_new_int(val);

} else {

// store

uintptr_t addr = MICROPY_MACHINE_MEM_GET_WRITE_ADDR(index, self->elem_size);

uint32_t val = mp_obj_get_int_truncated(value);

switch (self->elem_size) {

case 1: (*(uint8_t*)addr) = val; break;

case 2: (*(uint16_t*)addr) = val; break;

default: (*(uint32_t*)addr) = val; break;

}

return mp_const_none;

}

}

const mp_obj_type_t machine_mem_type = {

{ &mp_type_type },

.name = MP_QSTR_mem,

.print = machine_mem_print,

.subscr = machine_mem_subscr,

};

const machine_mem_obj_t machine_mem8_obj = {{&machine_mem_type}, 1};

const machine_mem_obj_t machine_mem16_obj = {{&machine_mem_type}, 2};

const machine_mem_obj_t machine_mem32_obj = {{&machine_mem_type}, 4};

#endif // MICROPY_PY_MACHINE