From 0572d1659d8b50b4251950474f688513c4a72f8e Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Sat, 3 Nov 2018 19:11:47 +0100
Subject: Add vm_object_sync support

* include/mach/vm_sync.h: New file.
* include/mach/mach_types.h: Include <mach/vm_sync.h>
* Makefrag.am (include_mach_HEADERS): Add include/mach/vm_sync.h.
* include/mach/mach_types.defs (vm_sync_t): Add type.
* include/mach/gnumach.defs (vm_object_sync, vm_msync): Add RPCs.
* vm/vm_map.h: Include <mach/vm_sync.h>.
(vm_map_msync): New declaration.
* vm/vm_map.c (vm_map_msync): New function.
* vm/vm_user.c: Include <mach/vm_sync.h> and <kern/mach.server.h>.
(vm_object_sync, vm_msync): New functions.
---
 vm/vm_map.c  | 31 +++++++++++++++++++++++++++++++
 vm/vm_map.h  |  4 ++++
 vm/vm_user.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 87 insertions(+)

(limited to 'vm')

diff --git a/vm/vm_map.c b/vm/vm_map.c
index 2fd27316..8afa74b3 100644
--- a/vm/vm_map.c
+++ b/vm/vm_map.c
@@ -4868,6 +4868,37 @@ kern_return_t vm_map_machine_attribute(
 	return ret;
 }
 
+/*
+ *	Routine:	vm_map_msync
+ *	Purpose:
+ *		Synchronize out pages of the given map out to their memory
+ *		manager, if any.
+ */
+kern_return_t vm_map_msync(
+	vm_map_t	map,
+	vm_offset_t	address,
+	vm_size_t	size,
+	vm_sync_t	sync_flags)
+{
+	if (map == VM_MAP_NULL)
+		KERN_INVALID_ARGUMENT;
+
+	if (sync_flags & (VM_SYNC_ASYNCHRONOUS | VM_SYNC_SYNCHRONOUS) ==
+			 (VM_SYNC_ASYNCHRONOUS | VM_SYNC_SYNCHRONOUS))
+		KERN_INVALID_ARGUMENT;
+
+	size =	round_page(address + size) - trunc_page(address);
+	address = trunc_page(address);
+
+	if (size == 0)
+		return KERN_SUCCESS;
+
+	/* TODO */
+
+	return KERN_INVALID_ARGUMENT;
+}
+
+
 
 #if	MACH_KDB
 
diff --git a/vm/vm_map.h b/vm/vm_map.h
index 87660f31..2561ec44 100644
--- a/vm/vm_map.h
+++ b/vm/vm_map.h
@@ -47,6 +47,7 @@
 #include <mach/vm_prot.h>
 #include <mach/vm_inherit.h>
 #include <mach/vm_wire.h>
+#include <mach/vm_sync.h>
 #include <vm/pmap.h>
 #include <vm/vm_object.h>
 #include <vm/vm_page.h>
@@ -443,6 +444,9 @@ extern kern_return_t	vm_map_machine_attribute(vm_map_t, vm_offset_t,
 						 vm_machine_attribute_t,
 						 vm_machine_attribute_val_t *);
 
+extern kern_return_t	vm_map_msync(vm_map_t,
+				     vm_offset_t, vm_size_t, vm_sync_t);
+
 /* Delete entry from map */
 extern void		vm_map_entry_delete(vm_map_t, vm_map_entry_t);
 
diff --git a/vm/vm_user.c b/vm/vm_user.c
index 6c1e3d6f..b6a069a5 100644
--- a/vm/vm_user.c
+++ b/vm/vm_user.c
@@ -39,8 +39,10 @@
 #include <mach/vm_param.h>
 #include <mach/vm_statistics.h>
 #include <mach/vm_cache_statistics.h>
+#include <mach/vm_sync.h>
 #include <kern/host.h>
 #include <kern/task.h>
+#include <kern/mach.server.h>
 #include <vm/vm_fault.h>
 #include <vm/vm_kern.h>
 #include <vm/vm_map.h>
@@ -479,3 +481,53 @@ kern_return_t vm_wire_all(const ipc_port_t port, vm_map_t map, vm_wire_t flags)
 
 	return vm_map_pageable_all(map, flags);
 }
+
+/*
+ *	vm_object_sync synchronizes out pages from the memory object to its
+ *	memory manager, if any.
+ */
+kern_return_t vm_object_sync(
+	vm_object_t		object,
+	vm_offset_t		offset,
+	vm_size_t		size,
+	boolean_t		should_flush,
+	boolean_t		should_return,
+	boolean_t		should_iosync)
+{
+	if (object == VM_OBJECT_NULL)
+		return KERN_INVALID_ARGUMENT;
+
+	/* FIXME: we should rather introduce an internal function, e.g.
+	   vm_object_update, rather than calling memory_object_lock_request.  */
+	vm_object_reference(object);
+
+	/* This is already always synchronous for now.  */
+	(void) should_iosync;
+
+	size = round_page(offset + size) - trunc_page(offset);
+	offset = trunc_page(offset);
+
+	return  memory_object_lock_request(object, offset, size,
+					   should_return ?
+						MEMORY_OBJECT_RETURN_ALL :
+						MEMORY_OBJECT_RETURN_NONE,
+					   should_flush,
+					   VM_PROT_NO_CHANGE,
+					   NULL, 0);
+}
+
+/*
+ *	vm_msync synchronizes out pages from the map to their memory manager,
+ *	if any.
+ */
+kern_return_t vm_msync(
+	vm_map_t		map,
+	vm_address_t		address,
+	vm_size_t		size,
+	vm_sync_t		sync_flags)
+{
+	if (map == VM_MAP_NULL)
+		return KERN_INVALID_ARGUMENT;
+
+	return vm_map_msync(map, (vm_offset_t) address, size, sync_flags);
+}
-- 
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