1 files changed, 57 insertions, 0 deletions
diff --git a/include/user/page-protection.h b/include/user/page-protection.h
index ea11cf9e32..d21fab1aaf 100644
--- a/include/user/page-protection.h
+++ b/include/user/page-protection.h
@@ -18,6 +18,63 @@
 
 void page_protect(tb_page_addr_t page_addr);
 int page_unprotect(tb_page_addr_t address, uintptr_t pc);
+
+/**
+ * page_set_flags:
+ * @start: first byte of range
+ * @last: last byte of range
+ * @flags: flags to set
+ * Context: holding mmap lock
+ *
+ * Modify the flags of a page and invalidate the code if necessary.
+ * The flag PAGE_WRITE_ORG is positioned automatically depending
+ * on PAGE_WRITE.  The mmap_lock should already be held.
+ */
+void page_set_flags(target_ulong start, target_ulong last, int flags);
+
+void page_reset_target_data(target_ulong start, target_ulong last);
+
+/**
+ * page_check_range_empty:
+ * @start: first byte of range
+ * @last: last byte of range
+ * Context: holding mmap lock
+ *
+ * Return true if the entire range [@start, @last] is unmapped.
+ * The memory lock must be held so that the caller will can ensure
+ * the result stays true until a new mapping can be installed.
+ */
+bool page_check_range_empty(target_ulong start, target_ulong last);
+
+/**
+ * page_find_range_empty
+ * @min: first byte of search range
+ * @max: last byte of search range
+ * @len: size of the hole required
+ * @align: alignment of the hole required (power of 2)
+ *
+ * If there is a range [x, x+@len) within [@min, @max] such that
+ * x % @align == 0, then return x.  Otherwise return -1.
+ * The memory lock must be held, as the caller will want to ensure
+ * the returned range stays empty until a new mapping can be installed.
+ */
+target_ulong page_find_range_empty(target_ulong min, target_ulong max,
+                                   target_ulong len, target_ulong align);
+
+/**
+ * page_get_target_data(address)
+ * @address: guest virtual address
+ *
+ * Return TARGET_PAGE_DATA_SIZE bytes of out-of-band data to associate
+ * with the guest page at @address, allocating it if necessary.  The
+ * caller should already have verified that the address is valid.
+ *
+ * The memory will be freed when the guest page is deallocated,
+ * e.g. with the munmap system call.
+ */
+__attribute__((returns_nonnull))
+void *page_get_target_data(target_ulong address);
+
 typedef int (*walk_memory_regions_fn)(void *, target_ulong,
                                       target_ulong, unsigned long);