From 8b1c1a23382806fcdbd3dbc7336a6ac2da8a995b Mon Sep 17 00:00:00 2001
From: salmonik <salmonik@tuta.io>
Date: Fri, 31 Jul 2026 16:10:40 +0200
Subject: 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
---
 shell/src/lib.rs | 38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

(limited to 'shell/src/lib.rs')

diff --git a/shell/src/lib.rs b/shell/src/lib.rs
index 5cab122..500eaae 100644
--- a/shell/src/lib.rs
+++ b/shell/src/lib.rs
@@ -50,6 +50,8 @@ pub fn run() -> ! {
             "mem" => cmd_mem(),
             "mmap" => cmd_mmap(),
             "stress" => cmd_stress(args),
+            "date" => cmd_date(),
+            "pci" => cmd_pci(),
             _ => {
                 gop_println!("unknown command: {}", cmd);
                 serial_println!("unknown command: {}", cmd);
@@ -124,11 +126,13 @@ fn cmd_help() {
     gop_println!("  mem      — show memory info");
     gop_println!("  mmap     — dump the UEFI memory map");
     gop_println!("  stress   — stress-test heap/page allocators");
+    gop_println!("  date     — show current date/time (RTC)");
+    gop_println!("  pci      — list PCI devices");
     gop_println!("  halt     — halt the system (hlt loop)");
     gop_println!("  poweroff — shut down via ACPI (ResetSystem)");
     gop_println!("  exit     — alias for poweroff");
     serial_println!("available commands:");
-    serial_println!("  help, echo, clear, hello, info, mem, mmap, stress, halt, poweroff, exit");
+    serial_println!("  help, echo, clear, hello, info, mem, mmap, stress, date, pci, halt, poweroff, exit");
 }
 
 fn cmd_echo(args: &str) {
@@ -364,6 +368,38 @@ fn cmd_halt() -> ! {
     rsnix::power::halt()
 }
 
+fn cmd_date() {
+    let t = rsnix::rtc::now();
+    let line = alloc::format!(
+        "{}-{:02}-{:02} {:02}:{:02}:{:02}",
+        t.year, t.month, t.day, t.hour, t.minute, t.second
+    );
+    gop_println!("{}", line);
+    serial_println!("{}", line);
+}
+
+fn cmd_pci() {
+    let devices = rsnix::pci::probe();
+    let mut out = alloc::string::String::new();
+    use alloc::fmt::Write;
+    let _ = writeln!(out, "pci: {} device(s)", devices.len());
+    let _ = writeln!(out, "  bus dev fn  class              vendor:device");
+    for d in &devices {
+        let _ = writeln!(
+            out,
+            "  {:02x}:{:02x}.{}  {:<16} {:04x}:{:04x}",
+            d.bus,
+            d.device,
+            d.func,
+            rsnix::pci::class_name(d.class, d.subclass),
+            d.vendor,
+            d.device_id
+        );
+    }
+    gop_print!("{}", out);
+    serial_print!("{}", out);
+}
+
 fn cmd_poweroff() -> ! {
     gop_println!("shutting down...");
     serial_println!("shutting down...");
-- 
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