diff options
| -rw-r--r-- | src/bits64/segmentation.rs | 14 | ||||
| -rw-r--r-- | src/msr.rs | 3 | ||||
| -rw-r--r-- | src/segmentation.rs | 11 |
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"); +} @@ -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::*; |