xnu-7195.101.1.tar.gz

[apple/xnu.git] / libsyscall / wrappers / _libkernel_init.c

diff --git a/libsyscall/wrappers/_libkernel_init.c b/libsyscall/wrappers/_libkernel_init.c
index 6440b6098f6cd4cdf70795726ed3d7ff0ebf8388..d1eac6f21eb14a56f5a14a25215ba585e1a0775a 100644 (file)
--- a/libsyscall/wrappers/_libkernel_init.c
+++ b/libsyscall/wrappers/_libkernel_init.c
@@ -30,6 +30,7 @@
 #include <stdbool.h>
 #include <strings.h>
 #include <unistd.h>
+#include <mach/vm_page_size.h>
 #include "_libkernel_init.h"
 
 extern int mach_init(void);
@@ -81,6 +82,19 @@ __libkernel_init(_libkernel_functions_t fns,
                _dlsym = fns->dlsym;
        }
        mach_init();
+#if TARGET_OS_OSX
+       for (size_t i = 0; envp[i]; i++) {
+
+#if defined(__i386__) || defined(__x86_64__)
+               const char *VM_KERNEL_PAGE_SHIFT_ENV = "VM_KERNEL_PAGE_SIZE_4K=1";
+               if (vm_kernel_page_shift != 12 && strcmp(VM_KERNEL_PAGE_SHIFT_ENV, envp[i]) == 0) {
+                       vm_kernel_page_shift = 12;
+                       vm_kernel_page_size = 1 << vm_kernel_page_shift;
+                       vm_kernel_page_mask = vm_kernel_page_size - 1;
+               }
+#endif /* defined(__i386__) || defined(__x86_64__) */
+       }
+#endif /* TARGET_OS_OSX */
 }
 
 void