1 files changed, 53 insertions, 0 deletions
diff --git a/src/kernel/include/sys.h b/src/kernel/include/sys.h
new file mode 100644
index 0000000..29735fa
--- /dev/null
+++ b/src/kernel/include/sys.h
@@ -0,0 +1,53 @@
+#pragma once
+
+#include <debug.h> 		// common header
+#include <config.h>
+
+static inline void outb(uint16_t port, uint8_t value) {
+	asm volatile("outb %1, %0" : : "dN"(port), "a"(value));
+}
+
+static inline void outw(uint16_t port, uint16_t value) {
+	asm volatile("outw %1, %0" : : "dN"(port), "a"(value));
+}
+
+static inline uint8_t inb(uint16_t port) {
+	uint8_t ret;
+	asm volatile("inb %1, %0" : "=a"(ret) : "dN"(port));
+	return ret;
+}
+
+static inline uint16_t inw(uint16_t port) {
+	uint16_t ret;
+	asm volatile("inw %1, %0" : "=a"(ret) : "dN"(port));
+	return ret;
+}
+
+static inline void invlpg(void* addr) {
+	asm volatile("invlpg (%0)" : : "r"(addr) : "memory");
+}
+
+#define BOCHS_BREAKPOINT asm volatile("xchg %bx, %bx")
+
+
+// Utility functions for memory alignment
+
+#define PAGE_SIZE		0x1000
+#define PAGE_MASK		0xFFFFF000
+#define PAGE_ALIGN_DOWN(x)	(((size_t)x) & PAGE_MASK) 
+#define PAGE_ALIGN_UP(x)  	((((size_t)x)&(~PAGE_MASK)) == 0 ? ((size_t)x) : (((size_t)x) & PAGE_MASK) + PAGE_SIZE)
+#define PAGE_ID(x)			(((size_t)x) / PAGE_SIZE)
+#define PAGE_SHIFT		12
+#define PT_SHIFT		10
+// PAGE_SHIFT + PT_SHIFT + PT_SHIFT = 32
+#define N_PAGES_IN_PT		1024
+#define PD_MIRROR_ADDR	0xFFC00000		// last 4MB used for PD mirroring
+#define LAST_KERNEL_ADDR	PD_MIRROR_ADDR
+#define FIRST_KERNEL_PT	(K_HIGHHALF_ADDR >> (PAGE_SHIFT+PT_SHIFT))	// must be 768
+
+#define MASK4			0xFFFFFFFC
+#define ALIGN4_UP(x)	((((size_t)x)&(~MASK4)) == 0 ? ((size_t)x) : (((size_t)x) & MASK4) + 4)
+#define ALIGN4_DOWN(x)	(((size_t)x)&MASK4)
+
+
+/* vim: set ts=4 sw=4 tw=0 noet :*/