1 | /* |
---|
2 | * Copyright (c) 2015 University of York. |
---|
3 | * Hesham Almatary <hesham@alumni.york.ac.uk> |
---|
4 | * |
---|
5 | * Copyright (c) 2013, The Regents of the University of California (Regents). |
---|
6 | * All Rights Reserved. |
---|
7 | * |
---|
8 | * Redistribution and use in source and binary forms, with or without |
---|
9 | * modification, are permitted provided that the following conditions |
---|
10 | * are met: |
---|
11 | * 1. Redistributions of source code must retain the above copyright |
---|
12 | * notice, this list of conditions and the following disclaimer. |
---|
13 | * 2. Redistributions in binary form must reproduce the above copyright |
---|
14 | * notice, this list of conditions and the following disclaimer in the |
---|
15 | * documentation and/or other materials provided with the distribution. |
---|
16 | * |
---|
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
---|
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
---|
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
---|
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
---|
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
---|
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
---|
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
---|
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
---|
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
---|
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
---|
27 | * SUCH DAMAGE. |
---|
28 | */ |
---|
29 | |
---|
30 | #include <bsp.h> |
---|
31 | #include <bsp/console-polled.h> |
---|
32 | #include <rtems/libio.h> |
---|
33 | #include <stdlib.h> |
---|
34 | #include <assert.h> |
---|
35 | #include <stdio.h> |
---|
36 | |
---|
37 | /* Most of the code below is copied from riscv-pk project */ |
---|
38 | # define TOHOST_CMD(dev, cmd, payload) \ |
---|
39 | (((uint64_t)(dev) << 56) | ((uint64_t)(cmd) << 48) | (uint64_t)(payload)) |
---|
40 | |
---|
41 | #define FROMHOST_DEV(fromhost_value) ((uint64_t)(fromhost_value) >> 56) |
---|
42 | #define FROMHOST_CMD(fromhost_value) ((uint64_t)(fromhost_value) << 8 >> 56) |
---|
43 | #define FROMHOST_DATA(fromhost_value) ((uint64_t)(fromhost_value) << 16 >> 16) |
---|
44 | |
---|
45 | volatile uint64_t tohost __attribute__((section(".htif"))); |
---|
46 | volatile uint64_t fromhost __attribute__((section(".htif"))); |
---|
47 | volatile int htif_console_buf; |
---|
48 | |
---|
49 | static void __check_fromhost() |
---|
50 | { |
---|
51 | uint64_t fh = fromhost; |
---|
52 | if (!fh) { |
---|
53 | return; |
---|
54 | } |
---|
55 | fromhost = 0; |
---|
56 | |
---|
57 | // this should be from the console |
---|
58 | assert(FROMHOST_DEV(fh) == 1); |
---|
59 | switch (FROMHOST_CMD(fh)) { |
---|
60 | case 0: |
---|
61 | htif_console_buf = 1 + (uint8_t)FROMHOST_DATA(fh); |
---|
62 | break; |
---|
63 | case 1: |
---|
64 | break; |
---|
65 | default: |
---|
66 | assert(0); |
---|
67 | } |
---|
68 | } |
---|
69 | |
---|
70 | static void __set_tohost(uintptr_t dev, uintptr_t cmd, uintptr_t data) |
---|
71 | { |
---|
72 | while (tohost) { |
---|
73 | __check_fromhost(); |
---|
74 | } |
---|
75 | tohost = TOHOST_CMD(dev, cmd, data); |
---|
76 | } |
---|
77 | |
---|
78 | int htif_console_getchar() |
---|
79 | { |
---|
80 | __check_fromhost(); |
---|
81 | int ch = htif_console_buf; |
---|
82 | if (ch >= 0) { |
---|
83 | htif_console_buf = -1; |
---|
84 | __set_tohost(1, 0, 0); |
---|
85 | } |
---|
86 | |
---|
87 | return ch - 1; |
---|
88 | } |
---|
89 | |
---|
90 | static void do_tohost_fromhost(uintptr_t dev, uintptr_t cmd, uintptr_t data) |
---|
91 | { |
---|
92 | __set_tohost(dev, cmd, data); |
---|
93 | |
---|
94 | while (1) { |
---|
95 | uint64_t fh = fromhost; |
---|
96 | if (fh) { |
---|
97 | if (FROMHOST_DEV(fh) == dev && FROMHOST_CMD(fh) == cmd) { |
---|
98 | fromhost = 0; |
---|
99 | break; |
---|
100 | } |
---|
101 | __check_fromhost(); |
---|
102 | } |
---|
103 | } |
---|
104 | } |
---|
105 | |
---|
106 | void htif_console_putchar(uint8_t ch) |
---|
107 | { |
---|
108 | __set_tohost(1, 1, ch); |
---|
109 | } |
---|
110 | |
---|
111 | void htif_poweroff() |
---|
112 | { |
---|
113 | while (1) { |
---|
114 | fromhost = 0; |
---|
115 | tohost = 1; |
---|
116 | } |
---|
117 | } |
---|
118 | |
---|
119 | void console_initialize_hardware(void) |
---|
120 | { |
---|
121 | /* Do nothing */ |
---|
122 | } |
---|
123 | |
---|
124 | static void outbyte_console(char ch) |
---|
125 | { |
---|
126 | htif_console_putchar(ch); |
---|
127 | } |
---|
128 | |
---|
129 | static char inbyte_console(void) |
---|
130 | { |
---|
131 | return htif_console_getchar(); |
---|
132 | } |
---|
133 | |
---|
134 | /* |
---|
135 | * console_outbyte_polled |
---|
136 | * |
---|
137 | * This routine transmits a character using polling. |
---|
138 | */ |
---|
139 | void console_outbyte_polled( |
---|
140 | int port, |
---|
141 | char ch |
---|
142 | ) |
---|
143 | { |
---|
144 | outbyte_console( ch ); |
---|
145 | } |
---|
146 | |
---|
147 | /* |
---|
148 | * console_inbyte_nonblocking |
---|
149 | * |
---|
150 | * This routine polls for a character. |
---|
151 | */ |
---|
152 | |
---|
153 | int console_inbyte_nonblocking(int port) |
---|
154 | { |
---|
155 | char c; |
---|
156 | |
---|
157 | c = inbyte_console(); |
---|
158 | if (!c) { |
---|
159 | return -1; |
---|
160 | } |
---|
161 | return (int) c; |
---|
162 | } |
---|
163 | |
---|
164 | /* |
---|
165 | * To support printk |
---|
166 | */ |
---|
167 | |
---|
168 | #include <rtems/bspIo.h> |
---|
169 | |
---|
170 | static void RISCV_output_char(char c) |
---|
171 | { |
---|
172 | console_outbyte_polled( 0, c ); |
---|
173 | } |
---|
174 | |
---|
175 | BSP_output_char_function_type BSP_output_char = RISCV_output_char; |
---|
176 | BSP_polling_getchar_function_type BSP_poll_char = |
---|
177 | (void *)console_inbyte_nonblocking; |
---|