x86_64: init local apic on boot, or legacy pic/pit as fallback

2023-03-19 20:36:36 +00:00
parent 7e26050bde
commit 8e9127cd6a
13 changed files with 274 additions and 72 deletions
--- a/arch/x86_64/acpi/apic_ctrl.S
+++ b/arch/x86_64/acpi/apic_ctrl.S
@@ -0,0 +1,18 @@
+	.global check_apic
+	.type check_apic, @function
+check_apic:
+	push %rbp
+	mov %rsp, %rbp
+
+	push %rbx
+	mov $1, %rax
+	cpuid
+
+	andl $0x200, %edx
+	shr $9, %edx
+
+	mov %rdx, %rax
+
+	pop %rbx
+	pop %rbp
+	ret