fix: fix login wallpaper startup delay

programs/include/Api/Syscall.hpp

@@ -252,6 +252,9 @@ namespace montauk::abi {
     static constexpr uint64_t SYS_TERMINAL_ATTACHED   = 177;  // () -> 1 when connected to a userspace terminal
     static constexpr uint64_t SYS_SPAWN_CAPS          = 185;
     static constexpr uint64_t SYS_SPAWN_REDIR_CAPS    = 186;
+    // As SYS_ALLOC, but commits every page up front instead of faulting them
+    // in one at a time. For buffers the caller is about to touch in full.
+    static constexpr uint64_t SYS_ALLOC_EAGER         = 187;  // (bytes) -> va, 0 on failure
 
     /* Kernel-owned process capabilities. User identities may namespace
        per-user resources, but never participate in authorization decisions. */

programs/include/libc/montauk.h

@@ -210,6 +210,7 @@ extern "C" {
 #define MTK_SYS_USB_BULK_IN_READ   184
 #define MTK_SYS_SPAWN_CAPS         185
 #define MTK_SYS_SPAWN_REDIR_CAPS   186
+#define MTK_SYS_ALLOC_EAGER        187
 /* @SYSCALLS-END */
 
 #define MTK_SOCK_TCP 1

programs/include/montauk/syscall.h

@@ -191,6 +191,10 @@ namespace montauk {
 
     // Memory
     inline void* alloc(uint64_t size) { return (void*)syscall1(montauk::abi::SYS_ALLOC, size); }
+    // As alloc(), but the kernel commits the whole range immediately. Use it
+    // for a buffer that is about to be written end to end: the lazy path costs
+    // one page fault, one mutex acquire and one VMA walk per 4 KiB.
+    inline void* alloc_eager(uint64_t size) { return (void*)syscall1(montauk::abi::SYS_ALLOC_EAGER, size); }
     inline void free(void* ptr) { syscall1(montauk::abi::SYS_FREE, (uint64_t)ptr); }
 
     // Timekeeping