switch over to libpicofe

[pcsx_rearmed.git] / frontend / linux / plat_mmap.c

diff --git a/frontend/linux/plat_mmap.c b/frontend/linux/plat_mmap.c
new file mode 100644 (file)
index 0000000..db661b6
--- /dev/null
+++ b/frontend/linux/plat_mmap.c
@@ -0,0 +1,91 @@
+/*
+ * (C) Gražvydas "notaz" Ignotas, 2008-2010
+ *
+ * This work is licensed under the terms of any of these licenses
+ * (at your option):
+ *  - GNU GPL, version 2 or later.
+ *  - GNU LGPL, version 2.1 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#define _GNU_SOURCE 1
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <errno.h>
+
+// this is some dupe code to avoid libpicofe dep
+
+//#include "../libpicofe/plat.h"
+
+/* XXX: maybe unhardcode pagesize? */
+#define HUGETLB_PAGESIZE (2 * 1024 * 1024)
+#define HUGETLB_THRESHOLD (HUGETLB_PAGESIZE / 2)
+#ifndef MAP_HUGETLB
+#define MAP_HUGETLB 0x40000 /* arch specific */
+#endif
+
+void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed)
+{
+       static int hugetlb_disabled;
+       int prot = PROT_READ | PROT_WRITE;
+       int flags = MAP_PRIVATE | MAP_ANONYMOUS;
+       void *req, *ret;
+
+       req = (void *)addr;
+       if (need_exec)
+               prot |= PROT_EXEC;
+       if (is_fixed)
+               flags |= MAP_FIXED;
+       if (size >= HUGETLB_THRESHOLD && !hugetlb_disabled)
+               flags |= MAP_HUGETLB;
+
+       ret = mmap(req, size, prot, flags, -1, 0);
+       if (ret == MAP_FAILED && (flags & MAP_HUGETLB)) {
+               fprintf(stderr,
+                       "warning: failed to do hugetlb mmap (%p, %zu): %d\n",
+                       req, size, errno);
+               hugetlb_disabled = 1;
+               flags &= ~MAP_HUGETLB;
+               ret = mmap(req, size, prot, flags, -1, 0);
+       }
+       if (ret == MAP_FAILED)
+               return NULL;
+
+       if (req != NULL && ret != req)
+               fprintf(stderr,
+                       "warning: mmaped to %p, requested %p\n", ret, req);
+
+       return ret;
+}
+
+void *plat_mremap(void *ptr, size_t oldsize, size_t newsize)
+{
+       void *ret;
+
+       ret = mremap(ptr, oldsize, newsize, MREMAP_MAYMOVE);
+       if (ret == MAP_FAILED)
+               return NULL;
+       if (ret != ptr)
+               printf("warning: mremap moved: %p -> %p\n", ptr, ret);
+
+       return ret;
+}
+
+void plat_munmap(void *ptr, size_t size)
+{
+       int ret;
+
+       ret = munmap(ptr, size);
+       if (ret != 0 && (size & (HUGETLB_PAGESIZE - 1))) {
+               // prehaps an autorounded hugetlb mapping?
+               size = (size + HUGETLB_PAGESIZE - 1) & ~(HUGETLB_PAGESIZE - 1);
+               ret = munmap(ptr, size);
+       }
+       if (ret != 0) {
+               fprintf(stderr,
+                       "munmap(%p, %zu) failed: %d\n", ptr, size, errno);
+       }
+}