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Move setup_SSE to boot.asm

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This commit is contained in:
Philipp Oppermann
2015-12-12 14:21:15 +01:00
parent e272cc9257
commit 953704f103
3 changed files with 31 additions and 57 deletions
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35
src/arch/x86_64/long_mode_init.asm
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@@ -18,8 +18,6 @@ extern rust_main
section .text
bits 64
long_mode_start:
call setup_SSE
; call rust main (with multiboot pointer in rdi)
call rust_main
.os_returned:
@@ -31,36 +29,3 @@ long_mode_start:
mov rax, 0x4f214f644f654f6e
mov [0xb8010], rax
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.
; parameter: error code (in ascii) in al
error:
mov rbx, 0x4f4f4f524f524f45
mov [0xb8000], rbx
mov rbx, 0x4f204f204f3a4f52
mov [0xb8008], rbx
mov byte [0xb800e], al
hlt
jmp error