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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 | ||
3bc20280 | 6 | #ifndef _GNU_SOURCE |
e5794429 | 7 | #define _GNU_SOURCE |
3bc20280 | 8 | #endif |
a093e81f PC |
9 | #include <errno.h> |
10 | #include <fcntl.h> | |
11 | #include <stdbool.h> | |
12 | #include <stdio.h> | |
13 | #include <stdlib.h> | |
14 | #include <sys/mman.h> | |
15 | #include <sys/shm.h> | |
16 | #include <sys/stat.h> | |
e5794429 | 17 | #include <sys/syscall.h> |
a093e81f PC |
18 | #include <unistd.h> |
19 | ||
20 | #include "../psxhw.h" | |
21 | #include "../psxmem.h" | |
22 | #include "../r3000a.h" | |
23 | ||
24 | #include "mem.h" | |
25 | ||
26 | #define ARRAY_SIZE(a) (sizeof(a) ? (sizeof(a) / sizeof((a)[0])) : 0) | |
27 | ||
28 | #ifndef MAP_FIXED_NOREPLACE | |
29 | #define MAP_FIXED_NOREPLACE 0x100000 | |
30 | #endif | |
31 | ||
2f609094 PC |
32 | #ifndef MFD_HUGETLB |
33 | #define MFD_HUGETLB 0x0004 | |
34 | #endif | |
35 | ||
a093e81f PC |
36 | static const uintptr_t supported_io_bases[] = { |
37 | 0x0, | |
38 | 0x10000000, | |
39 | 0x40000000, | |
40 | 0x80000000, | |
41 | }; | |
42 | ||
43 | static void * mmap_huge(void *addr, size_t length, int prot, int flags, | |
44 | int fd, off_t offset) | |
45 | { | |
46 | void *map = MAP_FAILED; | |
47 | ||
48 | if (length >= 0x200000) { | |
49 | map = mmap(addr, length, prot, | |
50 | flags | MAP_HUGETLB | (21 << MAP_HUGE_SHIFT), | |
51 | fd, offset); | |
52 | if (map != MAP_FAILED) | |
53 | printf("Hugetlb mmap to address 0x%lx succeeded\n", (uintptr_t) addr); | |
54 | } | |
55 | ||
56 | if (map == MAP_FAILED) { | |
57 | map = mmap(addr, length, prot, flags, fd, offset); | |
b992f6b7 | 58 | if (map != MAP_FAILED) { |
a093e81f | 59 | printf("Regular mmap to address 0x%lx succeeded\n", (uintptr_t) addr); |
b992f6b7 | 60 | #ifdef MADV_HUGEPAGE |
61 | madvise(map, length, MADV_HUGEPAGE); | |
62 | #endif | |
63 | } | |
a093e81f PC |
64 | } |
65 | ||
66 | return map; | |
67 | } | |
68 | ||
69 | static int lightrec_mmap_ram(bool hugetlb) | |
70 | { | |
71 | unsigned int i, j; | |
72 | int err, memfd, flags = 0; | |
73 | uintptr_t base; | |
74 | void *map; | |
75 | ||
76 | if (hugetlb) | |
77 | flags |= MFD_HUGETLB; | |
78 | ||
e5794429 | 79 | memfd = syscall(SYS_memfd_create, "/lightrec_memfd", |
80 | flags); | |
a093e81f PC |
81 | if (memfd < 0) { |
82 | err = -errno; | |
83 | fprintf(stderr, "Failed to create memfd: %d\n", err); | |
84 | return err; | |
85 | } | |
86 | ||
87 | err = ftruncate(memfd, 0x200000); | |
88 | if (err < 0) { | |
89 | err = -errno; | |
90 | fprintf(stderr, "Could not trim memfd: %d\n", err); | |
91 | goto err_close_memfd; | |
92 | } | |
93 | ||
94 | for (i = 0; i < ARRAY_SIZE(supported_io_bases); i++) { | |
95 | base = supported_io_bases[i]; | |
96 | ||
97 | for (j = 0; j < 4; j++) { | |
5937ccce | 98 | void *base_ptr = (void *)(base + j * 0x200000); |
99 | map = mmap_huge(base_ptr, 0x200000, PROT_READ | PROT_WRITE, | |
8de0dd9f | 100 | MAP_SHARED | MAP_FIXED_NOREPLACE, memfd, 0); |
a093e81f PC |
101 | if (map == MAP_FAILED) |
102 | break; | |
5937ccce | 103 | // some systems ignore MAP_FIXED_NOREPLACE |
104 | if (map != base_ptr) { | |
105 | munmap(map, 0x200000); | |
106 | break; | |
107 | } | |
a093e81f PC |
108 | } |
109 | ||
110 | /* Impossible to map using this base */ | |
111 | if (j == 0) | |
112 | continue; | |
113 | ||
114 | /* All mirrors mapped - we got a match! */ | |
115 | if (j == 4) | |
116 | break; | |
117 | ||
118 | /* Only some mirrors mapped - clean the mess and try again */ | |
119 | for (; j > 0; j--) | |
120 | munmap((void *)(base + (j - 1) * 0x200000), 0x200000); | |
121 | } | |
122 | ||
123 | if (i == ARRAY_SIZE(supported_io_bases)) { | |
124 | err = -EINVAL; | |
125 | goto err_close_memfd; | |
126 | } | |
127 | ||
128 | err = 0; | |
129 | psxM = (s8 *)base; | |
130 | ||
131 | err_close_memfd: | |
132 | close(memfd); | |
133 | return err; | |
134 | } | |
135 | ||
136 | int lightrec_init_mmap(void) | |
137 | { | |
138 | unsigned int i; | |
139 | uintptr_t base; | |
140 | void *map; | |
e5794429 | 141 | int err = lightrec_mmap_ram(true); |
a093e81f PC |
142 | if (err) { |
143 | err = lightrec_mmap_ram(false); | |
144 | if (err) { | |
145 | fprintf(stderr, "Unable to mmap RAM and mirrors\n"); | |
146 | return err; | |
147 | } | |
148 | } | |
149 | ||
150 | base = (uintptr_t) psxM; | |
151 | ||
152 | map = mmap((void *)(base + 0x1f000000), 0x10000, | |
153 | PROT_READ | PROT_WRITE, | |
8de0dd9f | 154 | MAP_PRIVATE | MAP_FIXED_NOREPLACE | MAP_ANONYMOUS, -1, 0); |
a093e81f PC |
155 | if (map == MAP_FAILED) { |
156 | err = -EINVAL; | |
157 | fprintf(stderr, "Unable to mmap parallel port\n"); | |
158 | goto err_unmap; | |
159 | } | |
160 | ||
161 | psxP = (s8 *)map; | |
162 | ||
163 | map = mmap_huge((void *)(base + 0x1fc00000), 0x200000, | |
164 | PROT_READ | PROT_WRITE, | |
8de0dd9f | 165 | MAP_PRIVATE | MAP_FIXED_NOREPLACE | MAP_ANONYMOUS, -1, 0); |
a093e81f PC |
166 | if (map == MAP_FAILED) { |
167 | err = -EINVAL; | |
168 | fprintf(stderr, "Unable to mmap BIOS\n"); | |
169 | goto err_unmap_parallel; | |
170 | } | |
171 | ||
172 | psxR = (s8 *)map; | |
173 | ||
174 | map = mmap((void *)(base + 0x1f800000), 0x10000, | |
175 | PROT_READ | PROT_WRITE, | |
176 | MAP_PRIVATE | MAP_FIXED_NOREPLACE | MAP_ANONYMOUS, 0, 0); | |
177 | if (map == MAP_FAILED) { | |
178 | err = -EINVAL; | |
179 | fprintf(stderr, "Unable to mmap scratchpad\n"); | |
180 | goto err_unmap_bios; | |
181 | } | |
182 | ||
183 | psxH = (s8 *)map; | |
184 | ||
f8548105 PC |
185 | map = mmap_huge((void *)(base + 0x800000), CODE_BUFFER_SIZE, |
186 | PROT_EXEC | PROT_READ | PROT_WRITE, | |
187 | MAP_PRIVATE | MAP_FIXED_NOREPLACE | MAP_ANONYMOUS, | |
8de0dd9f | 188 | -1, 0); |
f8548105 PC |
189 | if (map == MAP_FAILED) { |
190 | err = -EINVAL; | |
191 | fprintf(stderr, "Unable to mmap code buffer\n"); | |
192 | goto err_unmap_scratch; | |
193 | } | |
194 | ||
195 | code_buffer = map; | |
196 | ||
a093e81f PC |
197 | return 0; |
198 | ||
f8548105 PC |
199 | err_unmap_scratch: |
200 | munmap(psxH, 0x10000); | |
a093e81f | 201 | err_unmap_bios: |
14a530af | 202 | munmap(psxR, 0x200000); |
a093e81f PC |
203 | err_unmap_parallel: |
204 | munmap(psxP, 0x10000); | |
205 | err_unmap: | |
206 | for (i = 0; i < 4; i++) | |
207 | munmap((void *)((uintptr_t)psxM + i * 0x200000), 0x200000); | |
208 | return err; | |
209 | } | |
210 | ||
211 | void lightrec_free_mmap(void) | |
212 | { | |
213 | unsigned int i; | |
214 | ||
f8548105 | 215 | munmap(code_buffer, CODE_BUFFER_SIZE); |
a093e81f | 216 | munmap(psxH, 0x10000); |
14a530af | 217 | munmap(psxR, 0x200000); |
a093e81f PC |
218 | munmap(psxP, 0x10000); |
219 | for (i = 0; i < 4; i++) | |
220 | munmap((void *)((uintptr_t)psxM + i * 0x200000), 0x200000); | |
221 | } |