Add syscall library, make init program Rust

syscall/src/x86_64.rs

@@ -0,0 +1,61 @@
+use error::{Error, Result};
+
+pub unsafe fn syscall0(mut a: usize) -> Result<usize> {
+    asm!("int 0x80"
+        : "={rax}"(a)
+        : "{rax}"(a)
+        : "memory"
+        : "intel", "volatile");
+
+    Error::demux(a)
+}
+
+pub unsafe fn syscall1(mut a: usize, b: usize) -> Result<usize> {
+    asm!("int 0x80"
+        : "={rax}"(a)
+        : "{rax}"(a), "{rbx}"(b)
+        : "memory"
+        : "intel", "volatile");
+
+    Error::demux(a)
+}
+
+pub unsafe fn syscall2(mut a: usize, b: usize, c: usize) -> Result<usize> {
+    asm!("int 0x80"
+        : "={rax}"(a)
+        : "{rax}"(a), "{rbx}"(b), "{rcx}"(c)
+        : "memory"
+        : "intel", "volatile");
+
+    Error::demux(a)
+}
+
+pub unsafe fn syscall3(mut a: usize, b: usize, c: usize, d: usize) -> Result<usize> {
+    asm!("int 0x80"
+        : "={rax}"(a)
+        : "{rax}"(a), "{rbx}"(b), "{rcx}"(c), "{rdx}"(d)
+        : "memory"
+        : "intel", "volatile");
+
+    Error::demux(a)
+}
+
+pub unsafe fn syscall4(mut a: usize, b: usize, c: usize, d: usize, e: usize) -> Result<usize> {
+    asm!("int 0x80"
+        : "={rax}"(a)
+        : "{rax}"(a), "{rbx}"(b), "{rcx}"(c), "{rdx}"(d), "{rsi}"(e)
+        : "memory"
+        : "intel", "volatile");
+
+    Error::demux(a)
+}
+
+pub unsafe fn syscall5(mut a: usize, b: usize, c: usize, d: usize, e: usize, f: usize) -> Result<usize> {
+    asm!("int 0x80"
+        : "={rax}"(a)
+        : "{rax}"(a), "{rbx}"(b), "{rcx}"(c), "{rdx}"(d), "{rsi}"(e), "{rdi}"(f)
+        : "memory"
+        : "intel", "volatile");
+
+    Error::demux(a)
+}