From a022b64a05976d9770dfef82aad4666bc95810cc Mon Sep 17 00:00:00 2001
From: Tibor Nagy <xnagytibor@gmail.com>
Date: Mon, 8 Jun 2020 00:21:45 +0200
Subject: [PATCH] Implement CPUID feature checks
The bootloader now shows an error message instead of hanging with
a black screen on incompatible CPUs.
---
x86_64/cpuid.asm | 27 +++++++++++++++++
x86_64/cpuid.inc | 64 +++++++++++++++++++++++++++++++++++++++
x86_64/startup-common.asm | 3 ++
3 files changed, 94 insertions(+)
create mode 100644 x86_64/cpuid.asm
create mode 100644 x86_64/cpuid.inc
diff --git a/x86_64/cpuid.asm b/x86_64/cpuid.asm
new file mode 100644
index 0000000..17686dc
--- /dev/null
+++ b/x86_64/cpuid.asm
@@ -0,0 +1,27 @@
+%include "cpuid.inc"
+
+required_features:
+ .edx equ features_edx.fpu | features_edx.sse | features_edx.pae | features_edx.pse | features_edx.pge | features_edx.fxsr
+ .ecx equ features_ecx.xsave
+
+check_cpuid:
+ mov eax, 1
+ cpuid
+
+ and edx, required_features.edx
+ cmp edx, required_features.edx
+ jne .error
+
+ and ecx, required_features.ecx
+ cmp ecx, required_features.ecx
+ jne .error
+
+ ret
+
+.error:
+ mov si, .err_features
+ call print
+.halt:
+ jmp .halt
+
+.err_features: db "Required CPU features are not present",13,10,0
diff --git a/x86_64/cpuid.inc b/x86_64/cpuid.inc
new file mode 100644
index 0000000..1c2c62b
--- /dev/null
+++ b/x86_64/cpuid.inc
@@ -0,0 +1,64 @@
+features_edx:
+ .fpu equ 1 << 0
+ .vme equ 1 << 1
+ .de equ 1 << 2
+ .pse equ 1 << 3
+ .tsc equ 1 << 4
+ .msr equ 1 << 5
+ .pae equ 1 << 6
+ .mce equ 1 << 7
+ .cx8 equ 1 << 8
+ .apic equ 1 << 9
+ .sep equ 1 << 11
+ .mtrr equ 1 << 12
+ .pge equ 1 << 13
+ .mca equ 1 << 14
+ .cmov equ 1 << 15
+ .pat equ 1 << 16
+ .pse_36 equ 1 << 17
+ .psn equ 1 << 18
+ .clfsh equ 1 << 19
+ .ds equ 1 << 21
+ .acpi equ 1 << 22
+ .mmx equ 1 << 23
+ .fxsr equ 1 << 24
+ .sse equ 1 << 25
+ .sse2 equ 1 << 26
+ .ss equ 1 << 27
+ .htt equ 1 << 28
+ .tm equ 1 << 29
+ .ia64 equ 1 << 30
+ .pbe equ 1 << 31
+
+features_ecx:
+ .sse3 equ 1 << 0
+ .pclmulqdq equ 1 << 1
+ .dtes64 equ 1 << 2
+ .monitor equ 1 << 3
+ .ds_cpl equ 1 << 4
+ .vmx equ 1 << 5
+ .smx equ 1 << 6
+ .est equ 1 << 7
+ .tm2 equ 1 << 8
+ .ssse3 equ 1 << 9
+ .cnxt_id equ 1 << 10
+ .sdbg equ 1 << 11
+ .fma equ 1 << 12
+ .cmpxchg16b equ 1 << 13
+ .xtpr equ 1 << 14
+ .pdcm equ 1 << 15
+ .pcid equ 1 << 17
+ .dca equ 1 << 18
+ .sse4_1 equ 1 << 19
+ .sse4_2 equ 1 << 20
+ .x2apic equ 1 << 21
+ .movbe equ 1 << 22
+ .popcnt equ 1 << 23
+ .tsc_deadline equ 1 << 24
+ .aes equ 1 << 25
+ .xsave equ 1 << 26
+ .osxsave equ 1 << 27
+ .avx equ 1 << 28
+ .f16c equ 1 << 29
+ .rdrand equ 1 << 30
+ .hypervisor equ 1 << 31
diff --git a/x86_64/startup-common.asm b/x86_64/startup-common.asm
index 53c3178..34c8189 100644
--- a/x86_64/startup-common.asm
+++ b/x86_64/startup-common.asm
@@ -42,6 +42,8 @@ startup:
jmp .loaded_kernel
.loaded_kernel:
+ call check_cpuid
+
call memory_map
call vesa
@@ -139,6 +141,7 @@ load_extent:
%include "memory_map.asm"
%include "vesa.asm"
%include "initialize.asm"
+%include "cpuid.asm"
%ifndef KERNEL
%include "redoxfs.asm"
%ifndef FILESYSTEM
--
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