[MODERN FEATURES] SSE

kernel/arch/sse.S

@@ -0,0 +1,45 @@
+#include <registers.h>
+
+.intel_syntax noprefix
+
+.global sse_init
+sse_init:
+  mov rax, cr0
+  and ax, 0xFFFF-CR0_EM
+  or ax, CR0_MP
+  mov cr0, rax
+
+  mov rax, cr4
+  or ax, CR4_OSFXSR
+  or ax, CR4_OSXMMEXCPT
+  mov cr4, rax
+
+  ret
+
+.global sse_save
+sse_save:
+  movabs rax, offset _sse_buffer
+  fxsave [rax]
+  movabs rsi, offset _sse_buffer
+  mov rdx, 512
+  call memcpy
+  ret
+
+.global sse_restore
+sse_restore:
+  mov rsi, rdi
+  movabs rdi, offset _sse_buffer
+  mov rdx, 512
+  call memcpy
+  movabs rax, offset _sse_buffer
+  fxrstor [rax]
+  ret
+
+
+.section .data
+.align 16
+_sse_buffer:
+ .rept 512
+ .byte 0
+ .endr
+