Changeset 166 for trunk/hal/x86_64/core/hal_cpu.S

Timestamp:

Jul 10, 2017, 10:14:27 AM (7 years ago)

Author:

max@…

Message:

identify the cpu features

File:

• trunk/hal/x86_64/core/hal_cpu.S (modified) (2 diffs)

trunk/hal/x86_64/core/hal_cpu.S

@@ -23 +23 @@
 #include <hal_boot.h>
 #include <hal_segmentation.h>
+#include <hal_register.h>
 
 ASM_ENTRY(lgdt)
@@ -99 +100 @@
         ret
 
+ASM_ENTRY(rcr4)
+        movq    %cr4,%rax
+        ret
+
+ASM_ENTRY(lcr4)
+        movq    %rdi,%cr4
+        ret
+
+ASM_ENTRY(cpuid)
+        movq    %rbx,%r8
+        movq    %rdi,%rax
+        movq    %rsi,%rcx
+        movq    %rdx,%rsi
+        cpuid
+        movl    %eax,0(%rsi)
+        movl    %ebx,4(%rsi)
+        movl    %ecx,8(%rsi)
+        movl    %edx,12(%rsi)
+        movq    %r8,%rbx
+        ret
+
+/*
+ * To flush all TLB entries, we must re-set the CR4_PGE flag in %cr4.
+ */
+ASM_ENTRY(tlbflushg)
+        movq    %cr4,%rax
+        movq    %rax,%rdx
+        andq    $~CR4_PGE,%rdx
+        movq    %rdx,%cr4
+        movq    %rax,%cr4
+        ret
+
+ASM_ENTRY(tlbflush)
+        movq    %cr3,%rax
+        movq    %rax,%cr3
+        ret
+
 ASM_ENTRY(x86_stop) /* debug only */
         int     $0x0b