APIC, HPET, virtual memory

kernel/amd64/msr.c

@@ -0,0 +1,14 @@
+#include <amd64/msr.h>
+#include <libk/std.h>
+
+uint64_t amd64_rdmsr (uint32_t msr) {
+  uint32_t low, high;
+  __asm__ volatile ("rdmsr" : "=a"(low), "=d"(high) : "c"(msr));
+  return ((uint64_t)high << 32 | (uint64_t)low);
+}
+
+void amd64_wrmsr (uint32_t msr, uint64_t value) {
+  uint32_t low = (uint32_t)(value & 0xFFFFFFFF);
+  uint32_t high = (uint32_t)(value >> 32);
+  __asm__ volatile ("wrmsr" ::"c"(msr), "a"(low), "d"(high));
+}