Adding zen support

2 files changed, 96 insertions, 0 deletions

diff --git a/std/os/index.zig b/std/os/index.zig
index c9a7def1bb..eb192d7d85 100644
--- a/std/os/index.zig
+++ b/std/os/index.zig
@@ -7,9 +7,11 @@ const os = this;
 pub const windows = @import("windows/index.zig");
 pub const darwin = @import("darwin.zig");
 pub const linux = @import("linux.zig");
+pub const zen = @import("zen.zig");
 pub const posix = switch(builtin.os) {
     Os.linux => linux,
     Os.macosx, Os.ios => darwin,
+    Os.zen => zen,
     else => @compileError("Unsupported OS"),
 };
 
diff --git a/std/os/zen.zig b/std/os/zen.zig
new file mode 100644
index 0000000000..ffc491e404
--- /dev/null
+++ b/std/os/zen.zig
@@ -0,0 +1,94 @@
+//////////////////////////////
+////  Reserved mailboxes  ////
+//////////////////////////////
+
+pub const MBOX_TERMINAL = 1;
+
+
+///////////////////////////
+////  Syscall numbers  ////
+///////////////////////////
+
+pub const SYS_createMailbox = 0;
+pub const SYS_send = 1;
+pub const SYS_receive = 2;
+pub const SYS_map = 3;
+
+
+////////////////////
+////  Syscalls  ////
+////////////////////
+
+pub fn createMailbox(id: u16) {
+    _ = syscall1(SYS_createMailbox, id);
+}
+
+pub fn send(mailbox_id: u16, data: usize) {
+    _ = syscall2(SYS_send, mailbox_id, data);
+}
+
+pub fn receive(mailbox_id: u16) -> usize {
+    return syscall1(SYS_receive, mailbox_id);
+}
+
+pub fn map(v_addr: usize, p_addr: usize, size: usize, writable: bool) -> bool {
+    return syscall4(SYS_map, v_addr, p_addr, size, usize(writable)) != 0;
+}
+
+
+/////////////////////////
+////  Syscall stubs  ////
+/////////////////////////
+
+pub inline fn syscall0(number: usize) -> usize {
+    return asm volatile ("int $0x80"
+        : [ret] "={eax}" (-> usize)
+        : [number] "{eax}" (number));
+}
+
+pub inline fn syscall1(number: usize, arg1: usize) -> usize {
+    return asm volatile ("int $0x80"
+        : [ret] "={eax}" (-> usize)
+        : [number] "{eax}" (number),
+            [arg1] "{ecx}" (arg1));
+}
+
+pub inline fn syscall2(number: usize, arg1: usize, arg2: usize) -> usize {
+    return asm volatile ("int $0x80"
+        : [ret] "={eax}" (-> usize)
+        : [number] "{eax}" (number),
+            [arg1] "{ecx}" (arg1),
+            [arg2] "{edx}" (arg2));
+}
+
+pub inline fn syscall3(number: usize, arg1: usize, arg2: usize, arg3: usize) -> usize {
+    return asm volatile ("int $0x80"
+        : [ret] "={eax}" (-> usize)
+        : [number] "{eax}" (number),
+            [arg1] "{ecx}" (arg1),
+            [arg2] "{edx}" (arg2),
+            [arg3] "{ebx}" (arg3));
+}
+
+pub inline fn syscall4(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usize) -> usize {
+    return asm volatile ("int $0x80"
+        : [ret] "={eax}" (-> usize)
+        : [number] "{eax}" (number),
+            [arg1] "{ecx}" (arg1),
+            [arg2] "{edx}" (arg2),
+            [arg3] "{ebx}" (arg3),
+            [arg4] "{esi}" (arg4));
+}
+
+pub inline fn syscall5(number: usize, arg1: usize, arg2: usize, arg3: usize,
+    arg4: usize, arg5: usize) -> usize
+{
+    return asm volatile ("int $0x80"
+        : [ret] "={eax}" (-> usize)
+        : [number] "{eax}" (number),
+            [arg1] "{ecx}" (arg1),
+            [arg2] "{edx}" (arg2),
+            [arg3] "{ebx}" (arg3),
+            [arg4] "{esi}" (arg4),
+            [arg5] "{edi}" (arg5));
+}