xnu-1504.9.37.tar.gz

[apple/xnu.git] / osfmk / i386 / start64.s

diff --git a/osfmk/i386/start64.s b/osfmk/i386/start64.s
index e822e6c12dde5ad62157b9f21b6b4ce8d4b09eac..9c7188711af5630465f8005e70c7e110d82c4682 100644 (file)
--- a/osfmk/i386/start64.s
+++ b/osfmk/i386/start64.s
@@ -87,25 +87,6 @@ Entry(ml_load_desc64)
        ret
 
 
-Entry(ml_64bit_wrmsr64)
-       /* (uint32_t msr, uint64_t value) */
-       /* (uint32_t msr, uint32_t lo, uint32_t hi) */
-
-       FRAME
-
-       ENTER_64BIT_MODE()
-
-       movl    B_ARG0, %ecx
-       movl    B_ARG1, %eax
-       movl    B_ARG2, %edx
-       wrmsr
-
-       ENTER_COMPAT_MODE()
-
-       EMARF
-       ret
-
-
 Entry(ml_64bit_lldt)
        /* (int32_t selector) */
 
@@ -194,16 +175,11 @@ Entry(get64_cr3)
 
 /* FXSAVE and FXRSTOR operate in a mode dependent fashion, hence these variants.
  * Must be called with interrupts disabled.
- * We clear pending x87 exceptions here; this is technically incorrect, since we
- * should propagate those to the user, but the compatibility mode kernel is
- * currently not prepared to handle exceptions originating in 64-bit kernel mode.
- * However, it may be possible to work around this should it prove necessary.
  */
 
 Entry(fxsave64)
        movl            S_ARG0,%eax
        ENTER_64BIT_MODE()
-       fnclex
        fxsave          0(%eax)
        ENTER_COMPAT_MODE()
        ret
@@ -211,7 +187,13 @@ Entry(fxsave64)
 Entry(fxrstor64)
        movl            S_ARG0,%eax
        ENTER_64BIT_MODE()
-       fnclex
        fxrstor         0(%rax)
        ENTER_COMPAT_MODE()
        ret
+
+Entry(cpuid64)
+       ENTER_64BIT_MODE()
+       cpuid
+       ENTER_COMPAT_MODE()
+       ret
+