1 // SPDX-License-Identifier: LGPL-2.1-or-later
3 * Copyright (C) 2022 Paul Cercueil <paul@crapouillou.net>
17 #include "../psxmem.h"
18 #include "../r3000a.h"
22 #define ARRAY_SIZE(a) (sizeof(a) ? (sizeof(a) / sizeof((a)[0])) : 0)
24 #ifndef MAP_FIXED_NOREPLACE
25 #define MAP_FIXED_NOREPLACE 0x100000
28 static const uintptr_t supported_io_bases[] = {
35 static void * mmap_huge(void *addr, size_t length, int prot, int flags,
38 void *map = MAP_FAILED;
40 if (length >= 0x200000) {
41 map = mmap(addr, length, prot,
42 flags | MAP_HUGETLB | (21 << MAP_HUGE_SHIFT),
44 if (map != MAP_FAILED)
45 printf("Hugetlb mmap to address 0x%lx succeeded\n", (uintptr_t) addr);
48 if (map == MAP_FAILED) {
49 map = mmap(addr, length, prot, flags, fd, offset);
50 if (map != MAP_FAILED)
51 printf("Regular mmap to address 0x%lx succeeded\n", (uintptr_t) addr);
57 static int lightrec_mmap_ram(bool hugetlb)
60 int err, memfd, flags = 0;
67 memfd = memfd_create("/lightrec_memfd", flags);
70 fprintf(stderr, "Failed to create memfd: %d\n", err);
74 err = ftruncate(memfd, 0x200000);
77 fprintf(stderr, "Could not trim memfd: %d\n", err);
81 for (i = 0; i < ARRAY_SIZE(supported_io_bases); i++) {
82 base = supported_io_bases[i];
84 for (j = 0; j < 4; j++) {
85 map = mmap_huge((void *)(base + j * 0x200000),
86 0x200000, PROT_READ | PROT_WRITE,
87 MAP_SHARED | MAP_FIXED, memfd, 0);
88 if (map == MAP_FAILED)
92 /* Impossible to map using this base */
96 /* All mirrors mapped - we got a match! */
100 /* Only some mirrors mapped - clean the mess and try again */
102 munmap((void *)(base + (j - 1) * 0x200000), 0x200000);
105 if (i == ARRAY_SIZE(supported_io_bases)) {
107 goto err_close_memfd;
118 int lightrec_init_mmap(void)
125 err = lightrec_mmap_ram(true);
127 err = lightrec_mmap_ram(false);
129 fprintf(stderr, "Unable to mmap RAM and mirrors\n");
134 base = (uintptr_t) psxM;
136 map = mmap((void *)(base + 0x1f000000), 0x10000,
137 PROT_READ | PROT_WRITE,
138 MAP_PRIVATE | MAP_FIXED_NOREPLACE | MAP_ANONYMOUS, 0, 0);
139 if (map == MAP_FAILED) {
141 fprintf(stderr, "Unable to mmap parallel port\n");
147 map = mmap_huge((void *)(base + 0x1fc00000), 0x200000,
148 PROT_READ | PROT_WRITE,
149 MAP_PRIVATE | MAP_FIXED_NOREPLACE | MAP_ANONYMOUS, 0, 0);
150 if (map == MAP_FAILED) {
152 fprintf(stderr, "Unable to mmap BIOS\n");
153 goto err_unmap_parallel;
158 map = mmap((void *)(base + 0x1f800000), 0x10000,
159 PROT_READ | PROT_WRITE,
160 MAP_PRIVATE | MAP_FIXED_NOREPLACE | MAP_ANONYMOUS, 0, 0);
161 if (map == MAP_FAILED) {
163 fprintf(stderr, "Unable to mmap scratchpad\n");
172 munmap(psxR, 0x80000);
174 munmap(psxP, 0x10000);
176 for (i = 0; i < 4; i++)
177 munmap((void *)((uintptr_t)psxM + i * 0x200000), 0x200000);
181 void lightrec_free_mmap(void)
185 munmap(psxH, 0x10000);
186 munmap(psxR, 0x80000);
187 munmap(psxP, 0x10000);
188 for (i = 0; i < 4; i++)
189 munmap((void *)((uintptr_t)psxM + i * 0x200000), 0x200000);