rtc + pci: CMOS clock with date command, PCI bus enumeration

- rtc.rs: read the PC RTC via CMOS ports 0x70/0x71 (UIP wait, BCD/12h
  normalization, century sanity-check with 2000+ fallback); boot prints
  the wall clock, shell gains 'date'
- pci.rs: legacy config-space access (0xCF8/0xCFC) with full enumeration
  of buses 0-255; boot reports device count, shell gains 'pci' (lspci
  style listing with class names)
- QEMU q35 verified: Q35 host bridge, stdvga, e1000, ICH9 LPC

1 files changed, 13 insertions, 0 deletions

diff --git a/rsdos/src/main.rs b/rsdos/src/main.rs
index d9578e2..c35d88f 100644
--- a/rsdos/src/main.rs
+++ b/rsdos/src/main.rs
@@ -141,6 +141,19 @@ pub extern "efiapi" fn efi_main(image_handle: Handle, system_table: *mut SystemT
         rsnix::serial_println!("pg: self-test FAILED");
     }
 
+    let t = rsnix::rtc::now();
+    rsnix::serial_println!(
+        "rtc: {}-{:02}-{:02} {:02}:{:02}:{:02}",
+        t.year,
+        t.month,
+        t.day,
+        t.hour,
+        t.minute,
+        t.second
+    );
+    let devices = rsnix::pci::probe();
+    rsnix::serial_println!("pci: {} device(s) on all buses", devices.len());
+
     rsnix::serial_println!("boot: entering shell");
     shell::run();
 }