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Setup SSE because rust needs it

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This commit is contained in:
Philipp Oppermann
2015-08-17 15:09:22 +02:00
parent c65797d89f
commit e09ae042a3
1 changed files with 24 additions and 0 deletions
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24
src/arch/x86_64/long_mode_init.asm
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@@ -18,6 +18,7 @@ extern main
section .text section .text
bits 64 bits 64
long_mode_start: long_mode_start:
call setup_SSE
; call rust main ; call rust main
call main call main
@@ -26,6 +27,28 @@ long_mode_start:
mov qword [0xb8000], rax mov qword [0xb8000], rax
hlt hlt
; Check for SSE and enable it. If it's not supported throw error "a".
setup_SSE:
; check for SSE
mov rax, 0x1
cpuid
test edx, 1<<25
jz .no_SSE
; enable SSE
mov rax, cr0
and ax, 0xFFFB ; clear coprocessor emulation CR0.EM
or ax, 0x2 ; set coprocessor monitoring CR0.MP
mov cr0, rax
mov rax, cr4
or ax, 3 << 9 ; set CR4.OSFXSR and CR4.OSXMMEXCPT at the same time
mov cr4, rax
ret
.no_SSE:
mov al, "a"
jmp error
; Prints `ERROR: ` and the given error code to screen and hangs. ; Prints `ERROR: ` and the given error code to screen and hangs.
; parameter: error code (in ascii) in al ; parameter: error code (in ascii) in al
error: error:
@@ -35,3 +58,4 @@ error:
mov [0xb8008], rbx mov [0xb8008], rbx
mov byte [0xb800e], al mov byte [0xb800e], al
hlt hlt
jmp error