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a093e81f PC |
1 | // SPDX-License-Identifier: LGPL-2.1-or-later |
2 | /* | |
3 | * Copyright (C) 2022 Paul Cercueil <paul@crapouillou.net> | |
4 | */ | |
5 | ||
e5794429 | 6 | #define _GNU_SOURCE |
a093e81f PC |
7 | #include <errno.h> |
8 | #include <fcntl.h> | |
9 | #include <stdbool.h> | |
10 | #include <stdio.h> | |
11 | #include <stdlib.h> | |
12 | #include <sys/mman.h> | |
13 | #include <sys/shm.h> | |
14 | #include <sys/stat.h> | |
e5794429 | 15 | #include <sys/syscall.h> |
a093e81f PC |
16 | #include <unistd.h> |
17 | ||
18 | #include "../psxhw.h" | |
19 | #include "../psxmem.h" | |
20 | #include "../r3000a.h" | |
21 | ||
22 | #include "mem.h" | |
23 | ||
24 | #define ARRAY_SIZE(a) (sizeof(a) ? (sizeof(a) / sizeof((a)[0])) : 0) | |
25 | ||
26 | #ifndef MAP_FIXED_NOREPLACE | |
27 | #define MAP_FIXED_NOREPLACE 0x100000 | |
28 | #endif | |
29 | ||
2f609094 PC |
30 | #ifndef MFD_HUGETLB |
31 | #define MFD_HUGETLB 0x0004 | |
32 | #endif | |
33 | ||
a093e81f PC |
34 | static const uintptr_t supported_io_bases[] = { |
35 | 0x0, | |
36 | 0x10000000, | |
37 | 0x40000000, | |
38 | 0x80000000, | |
39 | }; | |
40 | ||
41 | static void * mmap_huge(void *addr, size_t length, int prot, int flags, | |
42 | int fd, off_t offset) | |
43 | { | |
44 | void *map = MAP_FAILED; | |
45 | ||
46 | if (length >= 0x200000) { | |
47 | map = mmap(addr, length, prot, | |
48 | flags | MAP_HUGETLB | (21 << MAP_HUGE_SHIFT), | |
49 | fd, offset); | |
50 | if (map != MAP_FAILED) | |
51 | printf("Hugetlb mmap to address 0x%lx succeeded\n", (uintptr_t) addr); | |
52 | } | |
53 | ||
54 | if (map == MAP_FAILED) { | |
55 | map = mmap(addr, length, prot, flags, fd, offset); | |
56 | if (map != MAP_FAILED) | |
57 | printf("Regular mmap to address 0x%lx succeeded\n", (uintptr_t) addr); | |
58 | } | |
59 | ||
60 | return map; | |
61 | } | |
62 | ||
63 | static int lightrec_mmap_ram(bool hugetlb) | |
64 | { | |
65 | unsigned int i, j; | |
66 | int err, memfd, flags = 0; | |
67 | uintptr_t base; | |
68 | void *map; | |
69 | ||
70 | if (hugetlb) | |
71 | flags |= MFD_HUGETLB; | |
72 | ||
e5794429 | 73 | memfd = syscall(SYS_memfd_create, "/lightrec_memfd", |
74 | flags); | |
a093e81f PC |
75 | if (memfd < 0) { |
76 | err = -errno; | |
77 | fprintf(stderr, "Failed to create memfd: %d\n", err); | |
78 | return err; | |
79 | } | |
80 | ||
81 | err = ftruncate(memfd, 0x200000); | |
82 | if (err < 0) { | |
83 | err = -errno; | |
84 | fprintf(stderr, "Could not trim memfd: %d\n", err); | |
85 | goto err_close_memfd; | |
86 | } | |
87 | ||
88 | for (i = 0; i < ARRAY_SIZE(supported_io_bases); i++) { | |
89 | base = supported_io_bases[i]; | |
90 | ||
91 | for (j = 0; j < 4; j++) { | |
92 | map = mmap_huge((void *)(base + j * 0x200000), | |
93 | 0x200000, PROT_READ | PROT_WRITE, | |
94 | MAP_SHARED | MAP_FIXED, memfd, 0); | |
95 | if (map == MAP_FAILED) | |
96 | break; | |
97 | } | |
98 | ||
99 | /* Impossible to map using this base */ | |
100 | if (j == 0) | |
101 | continue; | |
102 | ||
103 | /* All mirrors mapped - we got a match! */ | |
104 | if (j == 4) | |
105 | break; | |
106 | ||
107 | /* Only some mirrors mapped - clean the mess and try again */ | |
108 | for (; j > 0; j--) | |
109 | munmap((void *)(base + (j - 1) * 0x200000), 0x200000); | |
110 | } | |
111 | ||
112 | if (i == ARRAY_SIZE(supported_io_bases)) { | |
113 | err = -EINVAL; | |
114 | goto err_close_memfd; | |
115 | } | |
116 | ||
117 | err = 0; | |
118 | psxM = (s8 *)base; | |
119 | ||
120 | err_close_memfd: | |
121 | close(memfd); | |
122 | return err; | |
123 | } | |
124 | ||
125 | int lightrec_init_mmap(void) | |
126 | { | |
127 | unsigned int i; | |
128 | uintptr_t base; | |
129 | void *map; | |
e5794429 | 130 | int err = lightrec_mmap_ram(true); |
a093e81f PC |
131 | if (err) { |
132 | err = lightrec_mmap_ram(false); | |
133 | if (err) { | |
134 | fprintf(stderr, "Unable to mmap RAM and mirrors\n"); | |
135 | return err; | |
136 | } | |
137 | } | |
138 | ||
139 | base = (uintptr_t) psxM; | |
140 | ||
141 | map = mmap((void *)(base + 0x1f000000), 0x10000, | |
142 | PROT_READ | PROT_WRITE, | |
143 | MAP_PRIVATE | MAP_FIXED_NOREPLACE | MAP_ANONYMOUS, 0, 0); | |
144 | if (map == MAP_FAILED) { | |
145 | err = -EINVAL; | |
146 | fprintf(stderr, "Unable to mmap parallel port\n"); | |
147 | goto err_unmap; | |
148 | } | |
149 | ||
150 | psxP = (s8 *)map; | |
151 | ||
152 | map = mmap_huge((void *)(base + 0x1fc00000), 0x200000, | |
153 | PROT_READ | PROT_WRITE, | |
154 | MAP_PRIVATE | MAP_FIXED_NOREPLACE | MAP_ANONYMOUS, 0, 0); | |
155 | if (map == MAP_FAILED) { | |
156 | err = -EINVAL; | |
157 | fprintf(stderr, "Unable to mmap BIOS\n"); | |
158 | goto err_unmap_parallel; | |
159 | } | |
160 | ||
161 | psxR = (s8 *)map; | |
162 | ||
163 | map = mmap((void *)(base + 0x1f800000), 0x10000, | |
164 | PROT_READ | PROT_WRITE, | |
165 | MAP_PRIVATE | MAP_FIXED_NOREPLACE | MAP_ANONYMOUS, 0, 0); | |
166 | if (map == MAP_FAILED) { | |
167 | err = -EINVAL; | |
168 | fprintf(stderr, "Unable to mmap scratchpad\n"); | |
169 | goto err_unmap_bios; | |
170 | } | |
171 | ||
172 | psxH = (s8 *)map; | |
173 | ||
f8548105 PC |
174 | map = mmap_huge((void *)(base + 0x800000), CODE_BUFFER_SIZE, |
175 | PROT_EXEC | PROT_READ | PROT_WRITE, | |
176 | MAP_PRIVATE | MAP_FIXED_NOREPLACE | MAP_ANONYMOUS, | |
177 | 0, 0); | |
178 | if (map == MAP_FAILED) { | |
179 | err = -EINVAL; | |
180 | fprintf(stderr, "Unable to mmap code buffer\n"); | |
181 | goto err_unmap_scratch; | |
182 | } | |
183 | ||
184 | code_buffer = map; | |
185 | ||
a093e81f PC |
186 | return 0; |
187 | ||
f8548105 PC |
188 | err_unmap_scratch: |
189 | munmap(psxH, 0x10000); | |
a093e81f | 190 | err_unmap_bios: |
14a530af | 191 | munmap(psxR, 0x200000); |
a093e81f PC |
192 | err_unmap_parallel: |
193 | munmap(psxP, 0x10000); | |
194 | err_unmap: | |
195 | for (i = 0; i < 4; i++) | |
196 | munmap((void *)((uintptr_t)psxM + i * 0x200000), 0x200000); | |
197 | return err; | |
198 | } | |
199 | ||
200 | void lightrec_free_mmap(void) | |
201 | { | |
202 | unsigned int i; | |
203 | ||
f8548105 | 204 | munmap(code_buffer, CODE_BUFFER_SIZE); |
a093e81f | 205 | munmap(psxH, 0x10000); |
14a530af | 206 | munmap(psxR, 0x200000); |
a093e81f PC |
207 | munmap(psxP, 0x10000); |
208 | for (i = 0; i < 4; i++) | |
209 | munmap((void *)((uintptr_t)psxM + i * 0x200000), 0x200000); | |
210 | } |