X-Git-Url: https://scm.lunaixsky.com/lunaix-os.git/blobdiff_plain/9fe5e02cf615ad121c4460fbaaac2787d1e09c0e..290981180b9abc454e017271a8ebe75478c00e86:/lunaix-os/hal/cpu.c

diff --git a/lunaix-os/hal/cpu.c b/lunaix-os/hal/cpu.c
index ad1b0a5..ab5432c 100644
--- a/lunaix-os/hal/cpu.c
+++ b/lunaix-os/hal/cpu.c
@@ -38,4 +38,30 @@ void cpu_get_brand(char* brand_out) {
         j+=4;
     }
     brand_out[48] = '\0';
+}
+
+
+int
+cpu_has_apic() {
+    // reference: Intel manual, section 10.4.2
+    reg32 eax = 0, ebx = 0, edx = 0, ecx = 0;
+    __get_cpuid(1, &eax, &ebx, &ecx, &edx);
+    
+    return (edx & 0x100);
+}
+
+void
+cpu_rdmsr(uint32_t msr_idx, uint32_t* reg_high, uint32_t* reg_low)
+{
+    uint32_t h = 0, l = 0;
+    asm volatile("rdmsr" : "=d"(h), "=a"(l) : "c"(msr_idx));
+
+    *reg_high = h;
+    *reg_low = l;
+}
+
+void
+cpu_wrmsr(uint32_t msr_idx, uint32_t reg_high, uint32_t reg_low)
+{
+    asm volatile("wrmsr" : : "d"(reg_high), "a"(reg_low), "c"(msr_idx));
 }
\ No newline at end of file