From 16b7b4c2c008c976ee5948c97a8337d6224c3be9 Mon Sep 17 00:00:00 2001 From: Freya Murphy Date: Thu, 3 Apr 2025 21:32:00 -0400 Subject: add 64-bit idt/pic and fix paging --- kernel/cpu/fpu.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) create mode 100644 kernel/cpu/fpu.c (limited to 'kernel/cpu/fpu.c') diff --git a/kernel/cpu/fpu.c b/kernel/cpu/fpu.c new file mode 100644 index 0000000..f2674a7 --- /dev/null +++ b/kernel/cpu/fpu.c @@ -0,0 +1,12 @@ +#include + +#include "fpu.h" + +void fpu_init(void) { + size_t cr4; + uint16_t cw = 0x37F; + __asm__ volatile ("mov %%cr4, %0" : "=r"(cr4)); + cr4 |= 0x200; + __asm__ volatile ("mov %0, %%cr4" :: "r"(cr4)); + __asm__ volatile("fldcw %0" :: "m"(cw)); +} -- cgit v1.2.3-freya