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
104
|
/*
* Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _MACHINE_BUS_H_
#define _MACHINE_BUS_H_
#include <sys/types.h>
#include <sys/spinlock.h>
#include <sys/param.h>
struct bus_resource;
/*
* Hyra assumes that the bootloader uses PDE[256] for some
* higher half mappings. To avoid conflicts with those mappings,
* this offset is used to start device memory at PDE[257]. This
* will give us more than enough space.
*/
#define MMIO_OFFSET (VM_HIGHER_HALF + 0x8000000000)
/* Resource signature size max */
#define RSIG_MAX 16
/*
* Basic bus resource semantics
*
* BUS_PIO: If set, this resource uses port I/O
* BUS_MMIO: If set, this resource uses memory-mapped I/O
* BUS_WRITABLE: If unset, this resource is read-only
* BUS_DMA: If set, this resource is DMA-capable
*/
#define BUS_PIO BIT(0)
#define BUS_MMIO BIT(1)
#define BUS_WRITABLE BIT(2)
#define BUS_DMA BIT(3)
/*
* Common bus types.
*
* bus_addr_t: Physical MMIO address
* bus_sem_t: Resource semantics
*/
typedef uint64_t bus_addr_t;
typedef uint64_t bus_sem_t;
struct bus_op {
/* Enable/disable DMA */
int(*enable_dma)(struct bus_resource *brp, void *arg);
int(*disable_dma)(struct bus_resource *brp, void *arg);
/* Set/unset flags */
int(*set_sem)(struct bus_resource *brp, bus_sem_t sem);
int(*clr_sem)(struct bus_resource *brp, bus_sem_t sem);
/* DMA buffer related operations */
int(*dma_alloc)(struct bus_resource *brp, void *res);
int(*dma_free)(struct bus_resource *brp, void *p);
/* DMA transfer related operations */
ssize_t(*dma_in)(struct bus_resource *brp, void *p);
ssize_t(*dma_out)(struct bus_resource *brp, void *p);
};
struct bus_resource {
char signature[RSIG_MAX]; /* e.g., "PCI\0", "ISA\0", "LPC\0", etc */
off_t align; /* Alignment required (0: none) */
bus_addr_t dma_max; /* Maximum address possible for DMA */
bus_addr_t dma_min; /* Minimum address possible for DMA */
bus_addr_t base; /* Resource base [physical] address */
bus_sem_t sem; /* Resource semantics */
struct bus_op io; /* I/O operations */
struct spinlock lock; /* Protects this structure */
};
int bus_map(bus_addr_t addr, size_t size, int flags, void **vap);
struct bus_resource *bus_establish(const char *name);
#endif /* !_MACHINE_BUS_H_ */
|
