feat: ACPI parsing improvements, username in process struct + syscalls

programs/include/Api/Syscall.hpp

@@ -120,6 +120,10 @@ namespace Montauk {
     static constexpr uint64_t SYS_SETTZ         = 90;
     static constexpr uint64_t SYS_GETTZ         = 91;
 
+    // User management
+    static constexpr uint64_t SYS_SETUSER       = 92;
+    static constexpr uint64_t SYS_GETUSER       = 93;
+
     // Audio control commands (for SYS_AUDIOCTL)
     static constexpr int AUDIO_CTL_SET_VOLUME = 0;
     static constexpr int AUDIO_CTL_GET_VOLUME = 1;
@@ -306,6 +310,12 @@ namespace Montauk {
         char     name[64];
     };
 
+    struct ThermalInfo {
+        char     name[32];          // short zone name (e.g. "THRM", "TZ00")
+        int32_t  temperature;       // tenths of degrees Celsius, or -1 if unavailable
+        uint32_t _pad;
+    };
+
     struct ProcInfo {
         int32_t  pid;
         int32_t  parentPid;

programs/include/gui/desktop.hpp

@@ -120,6 +120,7 @@ struct DesktopState {
     SvgIcon icon_procmgr;
     SvgIcon icon_mandelbrot;
     SvgIcon icon_volume;
+    SvgIcon icon_temperature;
 
     // External apps discovered from 0:/apps/ manifests
     ExternalApp external_apps[MAX_EXTERNAL_APPS];
@@ -141,6 +142,13 @@ struct DesktopState {
     bool vol_dragging;        // slider drag in progress
     uint64_t vol_last_poll;
 
+    // Temperature monitoring
+    static constexpr int MAX_THERMAL_ZONES = 8;
+    Montauk::ThermalInfo thermal_zones[MAX_THERMAL_ZONES];
+    int thermal_zone_count;
+    uint64_t thermal_last_poll;
+    Rect temp_icon_rect;
+
     int screen_w, screen_h;
 
     // IDs of external windows we've sent a close event to but that haven't

programs/include/montauk/syscall.h

@@ -402,6 +402,14 @@ namespace montauk {
     // Kernel introspection
     inline void memstats(Montauk::MemStats* out) { syscall1(Montauk::SYS_MEMSTATS, (uint64_t)out); }
 
+    // User management
+    inline int setuser(int pid, const char* name) {
+        return (int)syscall2(Montauk::SYS_SETUSER, (uint64_t)pid, (uint64_t)name);
+    }
+    inline int getuser(char* buf, uint64_t maxLen) {
+        return (int)syscall2(Montauk::SYS_GETUSER, (uint64_t)buf, maxLen);
+    }
+
     // Window server
     inline int win_create(const char* title, int w, int h, Montauk::WinCreateResult* result) {
         return (int)syscall4(Montauk::SYS_WINCREATE, (uint64_t)title, (uint64_t)w, (uint64_t)h, (uint64_t)result);

programs/src/login/main.cpp

@@ -546,6 +546,7 @@ static void handle_key(LoginState* ls, const Montauk::KeyEvent& key) {
                 // Spawn desktop with username
                 int pid = montauk::spawn("0:/os/desktop.elf", ls->username);
                 if (pid >= 0) {
+                    montauk::setuser(pid, ls->username);
                     montauk::waitpid(pid);
                 }
                 // Desktop exited (logout) — clear session and fields
@@ -688,6 +689,7 @@ static void handle_mouse(LoginState* ls) {
             if (try_login(ls)) {
                 int pid = montauk::spawn("0:/os/desktop.elf", ls->username);
                 if (pid >= 0) {
+                    montauk::setuser(pid, ls->username);
                     montauk::waitpid(pid);
                 }
                 montauk::user::clear_session();
@@ -772,6 +774,7 @@ extern "C" void _start() {
             // Launch desktop directly -- no login required
             int pid = montauk::spawn("0:/os/desktop.elf", user);
             if (pid >= 0) {
+                montauk::setuser(pid, user);
                 montauk::waitpid(pid);
             }
             // Desktop exited (reboot/shutdown expected in setup mode).

programs/src/whoami/main.cpp

@@ -9,15 +9,14 @@
 #include <montauk/heap.h>
 #include <montauk/config.h>
 
+/*
+    Mar 24, 2026 - update to use getuser() syscall
+*/
 extern "C" void _start() {
-    auto doc = montauk::config::load("session");
-    const char* name = doc.get_string("session.username", "");
-    if (name[0]) {
-        montauk::print(name);
-        montauk::putchar('\n');
-    } else {
-        montauk::print("unknown\n");
-    }
-    doc.destroy();
+    char username[32] = { };
+    montauk::getuser((char*)&username, 32);
+    montauk::print((const char*)username);
+    montauk::print("\n");
+
     montauk::exit(0);
 }