x86_64: implement proper user/kernel %gs base switching

the %gs base address is now always set to the current cpu block while in kernel-mode, and is switched back to the userspace %gs base when returning to user-mode.
2026-02-23 18:26:21 +00:00
parent 273557fa9f
commit dbe117135b
4 changed files with 47 additions and 15 deletions
--- a/arch/x86_64/include/arch/msr.h
+++ b/arch/x86_64/include/arch/msr.h
@@ -3,7 +3,8 @@

 #include <stdint.h>

-#define MSR_GS_BASE 0xC0000101
+#define MSR_GS_BASE        0xC0000101
+#define MSR_KERNEL_GS_BASE 0xC0000102

 #ifdef __cplusplus
 extern "C" {