feat: expanded ACPI support, initial support for S3 sleep

kernel/src/Api/Power.hpp

@@ -1,6 +1,6 @@
 /*
     * Power.hpp
-    * SYS_RESET, SYS_SHUTDOWN syscalls
+    * SYS_RESET, SYS_SHUTDOWN, SYS_SUSPEND syscalls
     * Copyright (c) 2026 Daniel Hammer
 */
 
@@ -9,6 +9,7 @@
 #include <Efi/UEFI.hpp>
 #include <Memory/Paging.hpp>
 #include <ACPI/AcpiShutdown.hpp>
+#include <ACPI/AcpiSleep.hpp>
 
 namespace Montauk {
 
@@ -41,4 +42,11 @@ namespace Montauk {
         asm volatile("cli; hlt");
         __builtin_unreachable();
     }
+
+    static int64_t Sys_Suspend() {
+        if (!Hal::AcpiSleep::IsS3Available()) {
+            return -1; // S3 not supported
+        }
+        return (int64_t)Hal::AcpiSleep::Suspend();
+    }
 };

kernel/src/Api/Syscall.cpp

@@ -22,7 +22,7 @@
 #include "Info.hpp"       // SYS_GETINFO
 #include "Graphics.hpp"   // SYS_FBINFO, SYS_FBMAP, SYS_TERMSIZE, SYS_TERMSCALE
 #include "Net.hpp"        // SYS_PING, SYS_SOCKET, SYS_CONNECT, SYS_BIND, SYS_LISTEN, SYS_ACCEPT, SYS_SEND, SYS_RECV, SYS_CLOSESOCK, SYS_SENDTO, SYS_RECVFROM, SYS_GETNETCFG, SYS_SETNETCFG, SYS_RESOLVE
-#include "Power.hpp"      // SYS_RESET, SYS_SHUTDOWN
+#include "Power.hpp"      // SYS_RESET, SYS_SHUTDOWN, SYS_SUSPEND
 #include "Mouse.hpp"      // SYS_MOUSESTATE, SYS_SETMOUSEBOUNDS
 #include "IoRedir.hpp"    // SYS_SPAWN_REDIR, SYS_CHILDIO_READ, SYS_CHILDIO_WRITE, SYS_CHILDIO_WRITEKEY, SYS_CHILDIO_SETTERMSZ
 #include "Random.hpp"     // SYS_GETRANDOM
@@ -331,6 +331,8 @@ namespace Montauk {
             case SYS_BTINFO:
                 if (!ValidUserPtr(frame->arg1)) return -1;
                 return Sys_BtInfo((BtAdapterInfo*)frame->arg1);
+            case SYS_SUSPEND:
+                return Sys_Suspend();
             default:
                 return -1;
         }

kernel/src/Api/Syscall.hpp

@@ -171,6 +171,9 @@ namespace Montauk {
     static constexpr uint64_t SYS_BTLIST       = 87;
     static constexpr uint64_t SYS_BTINFO       = 88;
 
+    /* Power.hpp */
+    static constexpr uint64_t SYS_SUSPEND      = 89;
+
     static constexpr int SOCK_TCP = 1;
     static constexpr int SOCK_UDP = 2;