Commit | Line | Data |
---|---|---|
a093e81f PC |
1 | // SPDX-License-Identifier: LGPL-2.1-or-later |
2 | /* | |
3 | * Copyright (C) 2022 Paul Cercueil <paul@crapouillou.net> | |
4 | */ | |
5 | ||
6 | #include <errno.h> | |
7 | #include <fcntl.h> | |
8 | #include <stdbool.h> | |
9 | #include <stdio.h> | |
10 | #include <stdlib.h> | |
11 | #include <sys/mman.h> | |
12 | #include <sys/shm.h> | |
13 | #include <sys/stat.h> | |
14 | #include <unistd.h> | |
15 | ||
16 | #include "../psxhw.h" | |
17 | #include "../psxmem.h" | |
18 | #include "../r3000a.h" | |
19 | ||
20 | #include "mem.h" | |
21 | ||
22 | #define ARRAY_SIZE(a) (sizeof(a) ? (sizeof(a) / sizeof((a)[0])) : 0) | |
23 | ||
24 | #ifndef MAP_FIXED_NOREPLACE | |
25 | #define MAP_FIXED_NOREPLACE 0x100000 | |
26 | #endif | |
27 | ||
2f609094 PC |
28 | #ifndef MFD_HUGETLB |
29 | #define MFD_HUGETLB 0x0004 | |
30 | #endif | |
31 | ||
a093e81f PC |
32 | static const uintptr_t supported_io_bases[] = { |
33 | 0x0, | |
34 | 0x10000000, | |
35 | 0x40000000, | |
36 | 0x80000000, | |
37 | }; | |
38 | ||
39 | static void * mmap_huge(void *addr, size_t length, int prot, int flags, | |
40 | int fd, off_t offset) | |
41 | { | |
42 | void *map = MAP_FAILED; | |
43 | ||
44 | if (length >= 0x200000) { | |
45 | map = mmap(addr, length, prot, | |
46 | flags | MAP_HUGETLB | (21 << MAP_HUGE_SHIFT), | |
47 | fd, offset); | |
48 | if (map != MAP_FAILED) | |
49 | printf("Hugetlb mmap to address 0x%lx succeeded\n", (uintptr_t) addr); | |
50 | } | |
51 | ||
52 | if (map == MAP_FAILED) { | |
53 | map = mmap(addr, length, prot, flags, fd, offset); | |
54 | if (map != MAP_FAILED) | |
55 | printf("Regular mmap to address 0x%lx succeeded\n", (uintptr_t) addr); | |
56 | } | |
57 | ||
58 | return map; | |
59 | } | |
60 | ||
61 | static int lightrec_mmap_ram(bool hugetlb) | |
62 | { | |
63 | unsigned int i, j; | |
64 | int err, memfd, flags = 0; | |
65 | uintptr_t base; | |
66 | void *map; | |
67 | ||
68 | if (hugetlb) | |
69 | flags |= MFD_HUGETLB; | |
70 | ||
71 | memfd = memfd_create("/lightrec_memfd", flags); | |
72 | if (memfd < 0) { | |
73 | err = -errno; | |
74 | fprintf(stderr, "Failed to create memfd: %d\n", err); | |
75 | return err; | |
76 | } | |
77 | ||
78 | err = ftruncate(memfd, 0x200000); | |
79 | if (err < 0) { | |
80 | err = -errno; | |
81 | fprintf(stderr, "Could not trim memfd: %d\n", err); | |
82 | goto err_close_memfd; | |
83 | } | |
84 | ||
85 | for (i = 0; i < ARRAY_SIZE(supported_io_bases); i++) { | |
86 | base = supported_io_bases[i]; | |
87 | ||
88 | for (j = 0; j < 4; j++) { | |
89 | map = mmap_huge((void *)(base + j * 0x200000), | |
90 | 0x200000, PROT_READ | PROT_WRITE, | |
91 | MAP_SHARED | MAP_FIXED, memfd, 0); | |
92 | if (map == MAP_FAILED) | |
93 | break; | |
94 | } | |
95 | ||
96 | /* Impossible to map using this base */ | |
97 | if (j == 0) | |
98 | continue; | |
99 | ||
100 | /* All mirrors mapped - we got a match! */ | |
101 | if (j == 4) | |
102 | break; | |
103 | ||
104 | /* Only some mirrors mapped - clean the mess and try again */ | |
105 | for (; j > 0; j--) | |
106 | munmap((void *)(base + (j - 1) * 0x200000), 0x200000); | |
107 | } | |
108 | ||
109 | if (i == ARRAY_SIZE(supported_io_bases)) { | |
110 | err = -EINVAL; | |
111 | goto err_close_memfd; | |
112 | } | |
113 | ||
114 | err = 0; | |
115 | psxM = (s8 *)base; | |
116 | ||
117 | err_close_memfd: | |
118 | close(memfd); | |
119 | return err; | |
120 | } | |
121 | ||
122 | int lightrec_init_mmap(void) | |
123 | { | |
124 | unsigned int i; | |
125 | uintptr_t base; | |
126 | void *map; | |
127 | int err; | |
128 | ||
129 | err = lightrec_mmap_ram(true); | |
130 | if (err) { | |
131 | err = lightrec_mmap_ram(false); | |
132 | if (err) { | |
133 | fprintf(stderr, "Unable to mmap RAM and mirrors\n"); | |
134 | return err; | |
135 | } | |
136 | } | |
137 | ||
138 | base = (uintptr_t) psxM; | |
139 | ||
140 | map = mmap((void *)(base + 0x1f000000), 0x10000, | |
141 | PROT_READ | PROT_WRITE, | |
142 | MAP_PRIVATE | MAP_FIXED_NOREPLACE | MAP_ANONYMOUS, 0, 0); | |
143 | if (map == MAP_FAILED) { | |
144 | err = -EINVAL; | |
145 | fprintf(stderr, "Unable to mmap parallel port\n"); | |
146 | goto err_unmap; | |
147 | } | |
148 | ||
149 | psxP = (s8 *)map; | |
150 | ||
151 | map = mmap_huge((void *)(base + 0x1fc00000), 0x200000, | |
152 | PROT_READ | PROT_WRITE, | |
153 | MAP_PRIVATE | MAP_FIXED_NOREPLACE | MAP_ANONYMOUS, 0, 0); | |
154 | if (map == MAP_FAILED) { | |
155 | err = -EINVAL; | |
156 | fprintf(stderr, "Unable to mmap BIOS\n"); | |
157 | goto err_unmap_parallel; | |
158 | } | |
159 | ||
160 | psxR = (s8 *)map; | |
161 | ||
162 | map = mmap((void *)(base + 0x1f800000), 0x10000, | |
163 | PROT_READ | PROT_WRITE, | |
164 | MAP_PRIVATE | MAP_FIXED_NOREPLACE | MAP_ANONYMOUS, 0, 0); | |
165 | if (map == MAP_FAILED) { | |
166 | err = -EINVAL; | |
167 | fprintf(stderr, "Unable to mmap scratchpad\n"); | |
168 | goto err_unmap_bios; | |
169 | } | |
170 | ||
171 | psxH = (s8 *)map; | |
172 | ||
173 | return 0; | |
174 | ||
175 | err_unmap_bios: | |
176 | munmap(psxR, 0x80000); | |
177 | err_unmap_parallel: | |
178 | munmap(psxP, 0x10000); | |
179 | err_unmap: | |
180 | for (i = 0; i < 4; i++) | |
181 | munmap((void *)((uintptr_t)psxM + i * 0x200000), 0x200000); | |
182 | return err; | |
183 | } | |
184 | ||
185 | void lightrec_free_mmap(void) | |
186 | { | |
187 | unsigned int i; | |
188 | ||
189 | munmap(psxH, 0x10000); | |
190 | munmap(psxR, 0x80000); | |
191 | munmap(psxP, 0x10000); | |
192 | for (i = 0; i < 4; i++) | |
193 | munmap((void *)((uintptr_t)psxM + i * 0x200000), 0x200000); | |
194 | } |