From 9b22a6965579ea1867aea291d910c96f386b518b Mon Sep 17 00:00:00 2001
From: Brett Weiland <brett_weiland@bpcspace.com>
Date: Tue, 24 Aug 2021 14:09:29 -0500
Subject: major backup 8.24.21

---
 src/include/io.h | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 src/include/io.h

(limited to 'src/include/io.h')

diff --git a/src/include/io.h b/src/include/io.h
new file mode 100644
index 0000000..fb19bdc
--- /dev/null
+++ b/src/include/io.h
@@ -0,0 +1,38 @@
+#ifndef io_header
+#define io_header
+
+#include <stdint.h>
+#include <printf.h>
+
+static inline void outb(uint16_t port, uint8_t value) {
+  asm volatile("outb %1, %0" :: "a"(value), "Nd"(port));
+}
+
+static inline uint8_t inb(uint16_t port) {
+  uint8_t ret;
+  asm volatile("inb %0, %1" : "=a"(ret) : "Nd"(port));
+  return(ret);
+}
+
+static inline void io_wait() {
+  asm volatile("outb 0x80, %%al"::"a"(0));
+}
+
+static inline uint64_t read_tsc() {
+  uint64_t time;
+  asm volatile("xor rax, rax\n"
+      "rdtsc\n"
+      "shl rdx, 32\n"
+      "or rax, rdx\n"
+      "mov %0, rax\n"
+      :"=r"(time):);
+  return time;
+
+}
+
+void outb_wait(uint16_t port, uint8_t value);
+void read_msr(uint32_t addr, uint64_t *value);
+void write_msr(uint32_t addr, uint64_t value);
+void hlt();
+uint64_t get_rip();
+#endif
-- 
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