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
|
#ifndef _IPXE_ARM_IO_H
#define _IPXE_ARM_IO_H
/** @file
*
* iPXE I/O API for ARM
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#ifdef IOAPI_ARM
#define IOAPI_PREFIX_arm
#else
#define IOAPI_PREFIX_arm __arm_
#endif
#include <ipxe/dummy_pio.h>
/*
* Memory space mappings
*
*/
/*
* Physical<->Bus address mappings
*
*/
static inline __always_inline unsigned long
IOAPI_INLINE ( arm, phys_to_bus ) ( unsigned long phys_addr ) {
return phys_addr;
}
static inline __always_inline unsigned long
IOAPI_INLINE ( arm, bus_to_phys ) ( unsigned long bus_addr ) {
return bus_addr;
}
/*
* MMIO reads and writes up to native word size
*
*/
#define ARM_READX( _suffix, _type, _insn_suffix, _reg_prefix ) \
static inline __always_inline _type \
IOAPI_INLINE ( arm, read ## _suffix ) ( volatile _type *io_addr ) { \
_type data; \
__asm__ __volatile__ ( "ldr" _insn_suffix " %" _reg_prefix "0, %1" \
: "=r" ( data ) : "Qo" ( *io_addr ) ); \
return data; \
}
#ifdef __aarch64__
ARM_READX ( b, uint8_t, "b", "w" );
ARM_READX ( w, uint16_t, "h", "w" );
ARM_READX ( l, uint32_t, "", "w" );
ARM_READX ( q, uint64_t, "", "" );
#else
ARM_READX ( b, uint8_t, "b", "" );
ARM_READX ( w, uint16_t, "h", "" );
ARM_READX ( l, uint32_t, "", "" );
#endif
#define ARM_WRITEX( _suffix, _type, _insn_suffix, _reg_prefix ) \
static inline __always_inline void \
IOAPI_INLINE ( arm, write ## _suffix ) ( _type data, \
volatile _type *io_addr ) { \
__asm__ __volatile__ ( "str" _insn_suffix " %" _reg_prefix "0, %1" \
: : "r" ( data ), "Qo" ( *io_addr ) ); \
}
#ifdef __aarch64__
ARM_WRITEX ( b, uint8_t, "b", "w" );
ARM_WRITEX ( w, uint16_t, "h", "w" );
ARM_WRITEX ( l, uint32_t, "", "w" );
ARM_WRITEX ( q, uint64_t, "", "" );
#else
ARM_WRITEX ( b, uint8_t, "b", "" );
ARM_WRITEX ( w, uint16_t, "h", "" );
ARM_WRITEX ( l, uint32_t, "", "" );
#endif
/*
* Memory barrier
*
*/
static inline __always_inline void
IOAPI_INLINE ( arm, mb ) ( void ) {
#ifdef __aarch64__
__asm__ __volatile__ ( "dmb sy" );
#else
__asm__ __volatile__ ( "dmb" );
#endif
}
/* Dummy PIO */
DUMMY_PIO ( arm );
#endif /* _IPXE_ARM_IO_H */
|
