From ace65b453151845bc361f21f3e5b651c35f9f126 Mon Sep 17 00:00:00 2001 From: Jon Santmyer Date: Wed, 22 May 2024 13:00:41 -0400 Subject: massive refactor for mp and organization --- arch/x86_64/cpu.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 arch/x86_64/cpu.c (limited to 'arch/x86_64/cpu.c') diff --git a/arch/x86_64/cpu.c b/arch/x86_64/cpu.c new file mode 100644 index 0000000..d088fcd --- /dev/null +++ b/arch/x86_64/cpu.c @@ -0,0 +1,35 @@ +#include "arch/cpu.h" +#include "arch/x86_64/msr.h" + +extern void _syscall_entry(void); + +extern void idt_init(); + +void +cpu_setup(void) +{ + idt_init(); + + cpu_arch_enable_sce(); + cpu_set_syscall_entry((void*)_syscall_entry); +} + +void cpu_arch_enable_sce(void) +{ + msr_efer_t feat = msr_efer_read(); + feat.sce = 1; + msr_efer_write(feat); + + msr_star_t star = msr_star_read(); + star.kcs = 0x08; + star.ucs = 0x18; + msr_star_write(star); +} + +void +cpu_set_syscall_entry(void *ptr) +{ + msr_lstar_t lstar = (msr_lstar_t)ptr; + msr_lstar_write(lstar); +} + -- cgit v1.2.1