feat: VMware SMP, network perf, btop improvements#259
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- DNS: try Google (8.8.8.8) first instead of hypervisor-specific servers. All platforms NAT/bridge to host networking, so Google is universally reachable. Avoids 5s timeout per unreachable hypervisor DNS server. - DNS: reduce per-server timeout from 5s to 500ms with millisecond precision (hypervisor DNS responds in <50ms, public DNS in <200ms). - HTTP: resolve_multi() delegates to resolve_auto() — single DNS server order, no duplicate logic. - Tracing: DNS logs each server attempt with elapsed time; HTTP logs DNS, TCP connect, and response receive phases with cumulative timing. All guarded by #[cfg(feature = "std")]. - ARM64: increase network RX poll from 20Hz to 100Hz (every 10th tick instead of 50th) for 10ms max latency instead of 50ms. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- boot.S: Add SPAN bit to SCTLR_EL1 (don't auto-set PAN on exception entry) and explicitly clear PAN on both primary and secondary CPUs. VMware sets PAN=1 by default, causing permission faults on user-mapped page accesses from kernel code. - boot.S: Compute relocation delta (x21) on secondary CPU entry for VMware where RAM starts at 0x80000000 vs link address 0x40080000. Apply delta to all symbol references from literal pools (SMP_UART_PHYS, SMP_STACK_BASE_PHYS, exception_vectors_boot, SMP_MAIR/TCR/TTBR). - smp.rs: Add ram_base_offset() to SECONDARY_CPU_ENTRY_PHYS for correct physical entry point on VMware. - boot.S: Secondary CPUs now initialize SCTLR_EL1 to match primary (LSMAOE, nTLSMD, SPAN, EOS) for PSCI direct-EL1 path. - handlers.rs: Fix sys_fcntl to use single mutable borrow instead of drop-and-reacquire pattern, return EAGAIN instead of EBADF on lock contention. - procfs: Add global_ticks to /proc/stat for accurate CPU% in btop. - btop: Use global_ticks for CPU% delta (matches per-process tick scale), filter out Terminated processes from display. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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