Move swapgs to 64-bit only code.

3 files changed, 14 insertions, 14 deletions

diff --git a/src/bits64/segmentation.rs b/src/bits64/segmentation.rs
index 978025f..d246f0f 100644
--- a/src/bits64/segmentation.rs
+++ b/src/bits64/segmentation.rs
@@ -169,3 +169,17 @@ pub unsafe fn rdfsbase() -> u64 {
     asm!("rdfsbase $0" : "=r" (fs_base) );
     fs_base
 }
+
+/// Swap the GS register.
+///
+/// Exchanges the current GS base register value with the value contained
+/// in MSR address IA32_KERNEL_GS_BASE.
+///
+/// The SWAPGS instruction is available only in 64-bit mode.
+///
+/// # Unsafe
+/// The SWAPGS instruction is a privileged instruction intended for use by system software.
+#[cfg(target_arch = "x86_64")]
+pub unsafe fn swapgs() {
+    asm!("swapgs" ::: "gs");
+}
diff --git a/src/msr.rs b/src/msr.rs
index f2824b1..301b11f 100644
--- a/src/msr.rs
+++ b/src/msr.rs
@@ -3178,9 +3178,6 @@ pub const IA32_FS_BASE: u32 = 0xc0000100;
 /// Map of BASE Address of GS (R/W)  See Table 35-2.
 pub const IA32_GS_BASE: u32 = 0xc0000101;
 
-/// If  CPUID.80000001.EDX.\[bit  29\] = 1
-pub const IA32_KERNEL_GS_BASE: u32 = 0xc0000102;
-
 /// Swap Target of BASE Address of GS (R/W) See Table 35-2.
 pub const IA32_KERNEL_GSBASE: u32 = 0xc0000102;
 
diff --git a/src/segmentation.rs b/src/segmentation.rs
index 4b08b99..8757add 100644
--- a/src/segmentation.rs
+++ b/src/segmentation.rs
@@ -568,17 +568,6 @@ pub fn cs() -> SegmentSelector {
     SegmentSelector::from_raw(segment)
 }
 
-/// Swap the GS register.
-///
-/// Exchanges the current GS base register value with the value contained
-/// in MSR address IA32_KERNEL_GS_BASE.
-///
-/// # Unsafe
-/// The SWAPGS instruction is a privileged instruction intended for use by system software.
-pub unsafe fn swapgs() {
-    asm!("swapgs" ::: "gs");
-}
-
 #[cfg(test)]
 mod test {
     use super::*;