[PATCH 0/2] MR4738: ntdll/unix: Don't hardcode page_size, page_shift and page_mask

[Fabian Maurer (＠DarkShadow44)]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=52715

[PATCH 1/2] ntdll/unix: Don't hardcode page size

[Fabian Maurer]

From: Fabian Maurer

---
 dlls/ntdll/unix/unix_private.h | 2 +-
 dlls/ntdll/unix/virtual.c      | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/dlls/ntdll/unix/unix_private.h b/dlls/ntdll/unix/unix_private.h
index 07f2724eac7..2e1f737e1dd 100644
--- a/dlls/ntdll/unix/unix_private.h
+++ b/dlls/ntdll/unix/unix_private.h
@@ -120,7 +120,7 @@ struct async_fileio
     HANDLE               handle;
 };

-static const SIZE_T page_size = 0x1000;
+extern SIZE_T page_size;
 static const SIZE_T teb_size = 0x3800;  /* TEB64 + TEB32 + debug info */
 static const SIZE_T signal_stack_mask = 0xffff;
 static const SIZE_T signal_stack_size = 0x10000 - 0x3800;
diff --git a/dlls/ntdll/unix/virtual.c b/dlls/ntdll/unix/virtual.c
index e805c349eac..c6cfd7a9fa2 100644
--- a/dlls/ntdll/unix/virtual.c
+++ b/dlls/ntdll/unix/virtual.c
@@ -152,6 +152,7 @@ static const BYTE VIRTUAL_Win32Flags[16] =
 static struct wine_rb_tree views_tree;
 static pthread_mutex_t virtual_mutex;

+SIZE_T page_size;
 static const UINT page_shift = 12;
 static const UINT_PTR page_mask = 0xfff;
 static const UINT_PTR granularity_mask = 0xffff;
@@ -3256,6 +3257,8 @@ void virtual_init(void)
     int i;
     pthread_mutexattr_t attr;

+    page_size = getpagesize();
+
     pthread_mutexattr_init( &attr );
     pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_RECURSIVE );
     pthread_mutex_init( &virtual_mutex, &attr );

[PATCH 2/2] ntdll/unix: Don't hardcode page_shift and page_mask

[Fabian Maurer]

From: Fabian Maurer

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=52715
---
 dlls/ntdll/unix/virtual.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/dlls/ntdll/unix/virtual.c b/dlls/ntdll/unix/virtual.c
index c6cfd7a9fa2..77cff772584 100644
--- a/dlls/ntdll/unix/virtual.c
+++ b/dlls/ntdll/unix/virtual.c
@@ -153,8 +153,8 @@ static struct wine_rb_tree views_tree;
 static pthread_mutex_t virtual_mutex;

SIZE_T page_size;
-static const UINT page_shift = 12;
-static const UINT_PTR page_mask = 0xfff;
+static UINT page_shift;
+static UINT_PTR page_mask;
 static const UINT_PTR granularity_mask = 0xffff;

/* Note: these are Windows limits, you cannot change them. */
@@ -3246,6 +3246,13 @@ static void *alloc_virtual_heap( SIZE_T size )
     return anon_mmap_alloc( size, PROT_READ | PROT_WRITE );
 }

+static UINT get_page_shift(SIZE_T page_size)
+{
+    UINT ret = 0;
+    while (page_size >>= 1) ret++;
+    return ret;
+}
+
 /***********************************************************************
  *           virtual_init
  */
@@ -3258,6 +3265,8 @@ void virtual_init(void)
     pthread_mutexattr_t attr;

page_size = getpagesize();
+    page_shift = get_page_shift(page_size);
+    page_mask = page_size - 1;

pthread_mutexattr_init( &attr );
     pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_RECURSIVE );