+void *(*psxMapHook)(unsigned long addr, size_t size, int is_fixed,
+ enum psxMapTag tag);
+void (*psxUnmapHook)(void *ptr, size_t size, enum psxMapTag tag);
+
+void *psxMap(unsigned long addr, size_t size, int is_fixed,
+ enum psxMapTag tag)
+{
+ int flags = MAP_PRIVATE | MAP_ANONYMOUS;
+ int tried_to_align = 0;
+ unsigned long mask;
+ void *req, *ret;
+
+retry:
+ if (psxMapHook != NULL) {
+ ret = psxMapHook(addr, size, is_fixed, tag);
+ goto out;
+ }
+
+ /* avoid MAP_FIXED, it overrides existing mappings.. */
+ /* if (is_fixed)
+ flags |= MAP_FIXED; */
+
+ req = (void *)addr;
+ ret = mmap(req, size, PROT_READ | PROT_WRITE, flags, -1, 0);
+ if (ret == MAP_FAILED)
+ return NULL;
+
+out:
+ if (addr != 0 && ret != (void *)addr) {
+ SysMessage("psxMap: warning: wanted to map @%08x, got %p\n",
+ addr, ret);
+
+ if (is_fixed) {
+ psxUnmap(ret, size, tag);
+ return NULL;
+ }
+
+ if (ret != NULL && ((addr ^ (long)ret) & 0x00ffffff)
+ && !tried_to_align)
+ {
+ psxUnmap(ret, size, tag);
+
+ // try to use similarly aligned memory instead
+ // (recompiler needs this)
+ mask = (addr - 1) & ~addr & 0x07ffffff;
+ addr = (unsigned long)(ret + mask) & ~mask;
+ tried_to_align = 1;
+ goto retry;
+ }
+ }
+
+ return ret;
+}
+
+void psxUnmap(void *ptr, size_t size, enum psxMapTag tag)
+{
+ if (psxUnmapHook != NULL) {
+ psxUnmapHook(ptr, size, tag);
+ return;
+ }
+
+ if (ptr)
+ munmap(ptr, size);
+}
+