sad: death of panicless *+ smth

Give in in favor of str and utf8 with perfect valid state and panic
bailout everywhere in std.

Define some more Boot Info Format tags.

Cargo.lock

@@ -2,6 +2,12 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "ascii"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d92bec98840b8f03a5ff5413de5293bfcd8bf96467cf5452609f939ec6f5de16"
+
 [[package]]
 name = "bios"
 version = "0.1.0"
@@ -10,5 +16,6 @@ version = "0.1.0"
 name = "oxide"
 version = "0.1.0"
 dependencies = [
+ "ascii",
  "bios",
 ]

Cargo.toml

@@ -6,7 +6,6 @@ members = ["deps/bios", "members/oxide"]
 bios = { path = "deps/bios" }
 
 [profile.release]
-opt-level = "z"
 codegen-units = 1
 lto = "fat"
 panic = "abort"

members/oxide/Cargo.toml

@@ -10,4 +10,5 @@ test = false
 bench = false
 
 [dependencies]
+ascii = { version = "1.1.0", default-features = false }
 bios = { workspace = true }

members/oxide/src/main.rs

@@ -16,11 +16,16 @@
 /// Triggers a linker failure if this reaches that phase
 #[panic_handler]
 fn panic(_info: &PanicInfo) -> ! {
-    unsafe extern "C" {
-        static __PANIC_HANDLER_WAS_LINKED__DO_NOT_DEFINE: extern "C" fn() -> !;
-    }
+    // 2026-02-21: Officially the end of panicless OxideOS, did you know `Debug for str` has panic
+    // code paths :pensive:. At least compile ones, maybe runtime impossible but still not compiled
+    // away.
+    unsafe { asm!("ud2", "hlt", options(noreturn)) };
 
-    unsafe { __PANIC_HANDLER_WAS_LINKED__DO_NOT_DEFINE() };
+    // unsafe extern "C" {
+    //     static __PANIC_HANDLER_WAS_LINKED__DO_NOT_DEFINE: extern "C" fn() -> !;
+    // }
+
+    // unsafe { __PANIC_HANDLER_WAS_LINKED__DO_NOT_DEFINE() };
 }
 
 use core::{arch::asm, fmt::Write as _, hint::black_box, panic::PanicInfo};
@@ -49,15 +54,13 @@ extern "C" fn start(boot_info: &bif::FixedPart) -> ! {
     vt.set_color(VgaColor::new(ColorNibble::BLUE, ColorNibble::GREEN));
     vt.put_at(10, 5);
     vt.slide();
-    vt.print_n(boot_info as *const _ as usize as u32);
     vt.write(b"testinggg\ntags:\n");
 
     let tags = bif::TagsIter::new(boot_info);
     for tag in tags {
         sleep_short();
 
-        vt.print_n(tag.typ());
-        vt.write(b": ");
+        let _ = write!(&mut vt, "{}: ", tag.typ());
         let Some(tag) = tag.tag() else {
             vt.write(b"unknown tag\n");
             continue;

members/oxide/src/multiboot2.rs

@@ -54,6 +54,8 @@ pub mod bif {
     }
 
     pub mod types {
+        use ascii::AsciiStr;
+
         macro tagset($taggedvis:vis $taggedname:ident { $( $typname:ident ($typn:expr) { $($typprop:ident : $typpropty:ty),* $(,)? } ),* $(,)? }) {
             $(
                 #[repr(C)]
@@ -71,14 +73,14 @@ pub mod bif {
             }
         }
 
+        // All these AsciiStr are actually CStr's
         tagset! { pub TagTagged {
-
             Terminate(0) {},
             BootCommandLine(1) {
-                string: [u8],
+                string: AsciiStr,
             },
             BootLoaderName(2) {
-                string: [u8],
+                string: AsciiStr,
             },
             BasicMemoryInformation(4) {
                 mem_lower: u32,
@@ -89,6 +91,42 @@ pub mod bif {
                 partition: u32,
                 sub_partition: u32,
             },
+            MemoryMap(6) {
+                entry_size: u32,
+                entry_version: u32,
+                entries: [u8], // "varies"?
+            },
+            FramebufferInfo(8) {
+                 addr: u64,
+                 pitch: u32,
+                 width: u32,
+                 height: u32,
+                 bpp: u8,
+                 typ: u8,
+                 _reserved: u8,
+                 color_info: [u8],
+            },
+            ELFSymbols(9) {
+                num: u16,
+                entsize: u16,
+                shndx: u16,
+                _reserved: u16,
+                section_headers: [u8], // "varies"?
+            },
+            APMTable(10) {
+                version: u16,
+                cseg: u16,
+                offset: u32,
+                cseg_16: u16,
+                dseg: u16,
+                flags: u16,
+                cseg_len: u16,
+                cseg_16_len: u16,
+                dseg_len: u16,
+            },
+            ACPIoldRSDP(14) {
+                rsdpv1_old: [u8],
+            },
             ImageLoadBasePhyAddr(21) {
                 load_base_addr: u32,
             },
@@ -155,13 +193,18 @@ pub mod bif {
             }
 
             typ_match!(match typ {
+                Terminate
                 BasicMemoryInformation
                 BIOSBootDevice
-                Terminate
+                APMTable
                 ImageLoadBasePhyAddr
             } fat {
                 BootCommandLine
                 BootLoaderName
+                MemoryMap
+                FramebufferInfo
+                ELFSymbols
+                ACPIoldRSDP
             })
         }
     }

members/oxide/src/vga/vt.rs

@@ -54,18 +54,6 @@ where
         }
     }
 
-    pub fn print_n(&mut self, n: u32) {
-        const BASE: u32 = 10;
-
-        if n == 0 {
-            // TODO: print a 0 if no recursion in the future
-        } else {
-            let digit = (n % BASE) as u8;
-            self.print_n(n / 10);
-            self.write(&[b'0' + digit]);
-        }
-    }
-
     pub fn write(&mut self, data: &[u8]) {
         const BAD_CHAR_COL: VgaColor = VgaColor::new(ColorNibble::WHITE, ColorNibble::RED);