feat: aarch64 port - Raspberry Pi 4/400 SD boot (SDHCI, ext2 root + first-boot grow), USB hubs, PCI INTx routing, SMP, DMA fences

programs/include/montauk/syscall.h

@@ -654,6 +654,14 @@ namespace montauk {
     inline int fs_sync() {
         return (int)syscall0(montauk::abi::SYS_FS_SYNC);
     }
+    // Grow mounted volume `drive` (and its MBR partition) to fill the free
+    // space after it. apply=false only fills `status`; apply=true does one
+    // slice of the work and returns 1 while more remains, 0 when finished,
+    // or a negative status.
+    inline int fs_grow(int drive, montauk::abi::FsGrowStatus* status, bool apply) {
+        return (int)syscall3(montauk::abi::SYS_FS_GROW, (uint64_t)drive,
+                             (uint64_t)status, apply ? 1 : 0);
+    }
     inline int fs_format(const montauk::abi::FsFormatParams* params) {
         return (int)syscall1(montauk::abi::SYS_FSFORMAT, (uint64_t)params);
     }