fix(virtio-blk): wait for a request's own completion, by time

On riscv64 a system=v3 boot never reached its prompt: Artemis's writes
"timed out" and Zuse was never confirmed (logs/20261026-134850). vblk_io()
bounded its wait by ~1M polling iterations, which on riscv64 under TCG is
about one heartbeat tick of real time -- shorter than a write that allocates
space in a sparse host image. Instrumented, the request was seen completing
just after the give-up ("used idx=409 last=408"), and every later request
then took its predecessor's completion for its own and returned before its
own I/O was done (a stale used index at each later request), reusing the
descriptor chain while the device still owned it: silent read and write
corruption from that point on. FABRIC-3.md's 2026-09-09 "request that never
gets a used-ring completion" is this same early give-up.

Now: the wait is for this request's own completion (the used index
reaching the avail index it was given), bounded by 5 s of real time on the
CPU's counter (timer_now_ns(), which needs no interrupts); a request that
truly never completes takes the disk out of service instead of letting a
later request reuse the chain.

Red (riscv64 system=v3, with temporary instrumentation): 151003, 151100 --
a timeout then dozens of stale completions each. Green: 151238, 151332 --
none; Zuse confirmed; the keyboard line answered. system=v3 with the fix:
riscv64 151438, amd64 151528, aarch64 151610, no timeouts. Accepted (v4):
151722, 151916, 152247, POST 538/538, dict_hash 0xfec8c47cfc6f437f;
test-32, 39 modules, 0 failures.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kernel/src/virtio/virtio_blk.c

@@ -26,6 +26,7 @@
 #include "blkio.h"
 #include "log.h"
 #include "starkernel/arch.h"
+#include "starkernel/timer.h" /* timer_now_ns(): vblk_io()'s bound */
 
 /* -------------------------------------------------------------------------
  * Virtio 1.0 PCI capability structures
@@ -172,6 +173,18 @@ typedef struct {
 static VirtBlkState g_vblk;
 static int          g_vblk_ready = 0;
 
+/* How long one request may take before the disk is given up on: real time,
+ * not loop iterations (fixed 2026-10-26: a bound of ~1M iterations was
+ * about 10 ms on riscv64 under TCG, shorter than a write that allocates
+ * space in a sparse host image, and the driver then fell one completion
+ * behind for good -- see vblk_io()). */
+#define VBLK_IO_TIMEOUT_NS 5000000000ULL
+
+/* Set when a request was never completed within VBLK_IO_TIMEOUT_NS: the
+ * device may still own the descriptor chain, so it is not reused; every
+ * later request fails at once. */
+static int          g_vblk_dead = 0;
+
 /* -------------------------------------------------------------------------
  * Capability walker
  * Returns MMIO pointer to the virtio capability region, or NULL.
@@ -238,6 +251,8 @@ static int vblk_io(int write, uint64_t sector, void *buf, uint32_t nbytes) {
     VirtqDesc    *d = s->desc;
     int           result;
 
+    if (g_vblk_dead) return BLKIO_EIO;
+
     /* Fill request header */
     s->req_buf->type     = write ? VIRTIO_BLK_T_OUT : VIRTIO_BLK_T_IN;
     s->req_buf->reserved = 0;
@@ -278,43 +293,41 @@ static int vblk_io(int write, uint64_t sector, void *buf, uint32_t nbytes) {
     *doorbell = 0; /* queue index 0 */
     wmb();
 
-    /* Poll until device posts a used entry.
+    /* Wait for this request's own completion: the used index reaching the
-     *
+     * avail index this request was given (one request in flight, so the
-     * FABRIC-3.md, 2026-09-09: live-caught a real request that never gets
+     * two move together). Fixed 2026-10-26 (the riscv64 v3 boot's Artemis
-     * a used-ring completion -- root cause not yet isolated (every
+     * write timeouts, logs/20261026-134850): the wait was bounded by ~1M
-     * existing bounds check, vblk_read()'s own fblock vs total_forth_
+     * polling iterations, which on riscv64 under TCG is about one heartbeat
-     * blocks and read_devblock_4k()'s own lba vs total_blkio_blocks_1k,
+     * tick of real time -- shorter than a write that allocates space in a
-     * already passed before reaching here, so it isn't a simple out-of-
+     * sparse host image. The request then completed just after the driver
-     * range request; disabling interrupts around this call was tried and
+     * had given up on it, and every later request took its predecessor's
-     * made it strictly worse -- suggests QEMU's own device-model
+     * completion for its own and returned before its own I/O was done
-     * completion here depends on guest-visible time/interrupt progress in
+     * (seen: "used idx=409 last=408" at the timeout, then a stale used
-     * this TCG configuration, not a driver-side reentrancy bug -- so that
+     * index at every later request), reusing the descriptor chain while the
-     * approach was reverted). spin was 0x2000000 (~33M); at that bound a
+     * device still owned it. Now the bound is real time, measured by the
-     * single such failure cost tens of real minutes (confirmed: 31+ CPU-
+     * CPU's own counter (timer_now_ns(), which needs no interrupts: the
-     * minutes on one boot) because blk_migration_idle_check()'s own scan
+     * disk is used before the timer runs), and a request that truly never
-     * calls this per un-cached devblock, up to ~23,000 times a boot, and
+     * completes takes the disk out of service rather than letting a later
-     * apparently more than one of those hits this failure mode. Cut by
+     * request reuse the chain. The 2026-09-09 notes (FABRIC-3.md) on a
-     * ~30x: still enormously generous for a real completion (confirmed
+     * request "that never gets a used-ring completion" describe this same
-     * live those return in a handful of iterations, not millions), but
+     * early give-up. arch_relax() stays: a tight MMIO-adjacent poll with no
-     * turns what was an effectively-unbounded stall into a fast, loud,
+     * yield hint can starve TCG's own host-side timer injection (xhci.c,
-     * logged failure instead -- callers already tolerate BLKIO_EIO
+     * xhci_wait_bit()). */
-     * (zero-fill and move on), they just couldn't afford the old wait to
+    {
-     * find that out. */
+        uint64_t t0 = timer_now_ns();
-    uint32_t spin = 0x100000u; /* ~1M iterations */
+        result = BLKIO_OK;
-    result = BLKIO_OK;
+        while (s->used->idx != s->avail_idx) {
-    while (s->used->idx == s->last_used_idx) {
+            rmb();
-        rmb();
+            arch_relax();
-        arch_relax(); /* FABRIC-3.md, 2026-09-09: xhci_wait_bit()'s own doc
+            if (timer_now_ns() - t0 > VBLK_IO_TIMEOUT_NS) {
-                        * comment (xhci.c) has the full reasoning -- a tight
+                log_message(LOG_ERROR,
-                        * MMIO-adjacent poll with no yield hint can starve
+                            "virtio_blk: request never completed in 5 s (write=%d sector=%llu) -- "
-                        * TCG's own host-side timer injection. */
+                            "the disk is taken out of service",
-        if (!--spin) {
+                            write, (unsigned long long)sector);
-            log_message(LOG_ERROR,
+                g_vblk_dead = 1;
-                        "virtio_blk: vblk_io timed out (write=%d sector=%llu) -- "
+                result = BLKIO_EIO;
-                        "queue never posted a used entry",
+                break;
-                        write, (unsigned long long)sector);
+            }
-            result = BLKIO_EIO;
-            break;
         }
     }
     if (result == BLKIO_OK) {

logs/20261026-151722/amd64/qemu-amd64-20261026-151722.log

@@ -0,0 +1,157 @@
+[=3hBdsDxe: loading Boot0002 "UEFI QEMU DVD-ROM QM00005 " from PciRoot(0x0)/Pci(0x1F,0x2)/Sata(0x2,0xFFFF,0x0)
+BdsDxe: starting Boot0002 "UEFI QEMU DVD-ROM QM00005 " from PciRoot(0x0)/Pci(0x1F,0x2)/Sata(0x2,0xFFFF,0x0)
+[=3hStarKernel UEFI Loader
+Loading kernel from ESP...
+[CKPT 001] Entered efi_main - ConOut live
+RAW SERIAL UP
+[CKPT 002] Serial (COM1) initialized
+Monolithic build - kernel linked directly
+Collecting boot information...
+CmdLine: parsed OK
+[CKPT 004] Command line parsed
+[CKPT 005] Kernel stack allocation decided
+[CKPT 006] Boot info collected (ACPI table located)
+GOP: linear framebuffer found
+[CKPT 007] GOP: linear framebuffer found
+[CKPT 008] About to enter ExitBootServices retry loop
+EBS...
+EBS OK
+Calling kernel_main (monolithic)...
+
+
+   _____ _             _  __                    _ 
+  / ____| |           | |/ /                   | |
+ | (___ | |_ __ _ _ __| ' / ___ _ __ _ __   ___| |
+  \___ \| __/ _` | '__|  < / _ \ '__| '_ \ / _ \ |
+  ____) | || (_| | |  | . \  __/ |  | | | |  __/ |
+ |_____/ \__\__,_|_|  |_|\_\___|_|  |_| |_|\___|_|
+
+LithosAnanke v2.1.0 amd64
+Architecture: amd64
+Build: Oct 26 2026 15:17:20
+
+UEFI BootServices: EXITED
+Console: serial line is a 16550 at port 0x00000000000003f8 (COM1, probed)
+
+=== StarKernel Boot Information ===
+Memory map entries: 135
+Total memory: 1023 MB
+Usable memory: 966 MB
+===================================
+
+PMM initialized.
+PMM statistics:
+  Total pages: 248679
+  Free pages : 247156
+  Used pages : 1523
+  Total MB   : 971
+  Free  MB   : 965
+  Used  MB   : 5
+
+VMM initialized (mapped RAM, CR3 switched)
+VMM initialized (mapped RAM, CR3 switched)
+VMM self-test: mapped OK at 0xffff800000000000
+VMM self-test complete.
+
+IDT installed.
+
+APIC: init...
+APIC: IA32_APIC_BASE MSR=0x00000000fee00900
+APIC: stale-ISR drain: 0 EOI(s) issued
+APIC: initialized (xAPIC MMIO, TPR=0, SIVR=0x1FF, EOI-clear)
+APIC: init done
+
+I/O APIC: init...
+I/O APIC: base=0xfec00000, gsi_base=0, overrides=5
+  override: source=00 gsi=2 flags=0x0000
+  override: source=05 gsi=5 flags=0x000d
+  override: source=09 gsi=9 flags=0x000d
+  override: source=0a gsi=10 flags=0x000d
+  override: source=0b gsi=11 flags=0x000d
+i8042: keyboard ACKed enable-scanning
+i8042: IRQ1 enabled in controller config byte
+I/O APIC: keyboard IRQ1 routed (masked)
+
+Timer: init...
+Timer: init start
+Timer: PM_TMR_BLK discovered from FADT at port 1544
+Timer: VM mode detected (hypervisor present).
+Timer: HPET calibration disabled (VM-exit MMIO would poison timing).
+Timer: WARNING: invariant TSC not present under hypervisor.
+Timer:          continuing in RELATIVE mode (no determinism guarantees).
+Timer: RDTSCP not present; using RDTSC (less serialized).
+Timer: CPUID frequency unavailable; trying PM Timer...
+Timer: trust=1 (0=NONE,1=REL,2=ABS), TSC=2097481789 Hz
+Timer: init done
+
+Kernel heap initialized.
+Heap statistics:
+  Total bytes: 536870872
+  Free  bytes: 536870872
+  Used  bytes: 0
+  Peak  bytes: 0
+  Heap base addr: 24641536
+  Heap end  addr: 561512448
+
+Heartbeat: init...
+APIC Timer: calibrating...
+APIC Timer: apic_hz=1006708142, tick_hz=100, initial_count=10067081
+APIC Timer: configured (masked, ready to start)
+Heartbeat: init done
+Kernel initialization complete.
+Boot successful!
+
+System: StarForth v4 (this build's default)
+StarForth v4: one host node, the F18-derived engine
+V4: capsule v4:sys:map-64.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:map-64.f18 capsule_hash=0x949eb6a1e9260e49
+V4: capsule v4:sys:core.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:core.f18 capsule_hash=0xb8f167892ec18c28
+V4: capsule v4:sys:input.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:input.f18 capsule_hash=0x85d3ec486d929a79
+V4: capsule v4:sys:dict.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:dict.f18 capsule_hash=0x1379bd3b5de811dc
+V4: capsule v4:sys:codegen.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:codegen.f18 capsule_hash=0x36d2ae84d2911b90
+V4: capsule v4:sys:compile.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:compile.f18 capsule_hash=0x11145c4c2ab819d8
+V4: capsule v4:sys:quit.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:quit.f18 capsule_hash=0x43cadf3b21ddbf3e
+V4: capsule v4:sys:forth.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:forth.f18 capsule_hash=0x16cab4a1268b85da
+V4: capsule v4:sys:numout.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:numout.f18 capsule_hash=0x85a240ad3fb2b299
+V4: capsule v4:sys:words.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:words.f18 capsule_hash=0xb1d381f927d9f14e
+V4: capsule v4:sys:system.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:system.f18 capsule_hash=0xd92203664c2915bd
+V4: capsule v4:sys:qmath.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:qmath.f18 capsule_hash=0xdb4140713dd857f3
+V4: capsule v4:sys:blocks.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:blocks.f18 capsule_hash=0x76307ef48678dc2a
+V4: capsule v4:sys:log.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:log.f18 capsule_hash=0xfc6540e6b824a52b
+V4: capsule v4:sys:acl.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:acl.f18 capsule_hash=0x6845aa048db7eb22
+V4: capsule v4:sys:end.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:end.f18 capsule_hash=0x5ef01312c07b79cc
+PARITY:V4_ROM words=2372 rom_hash=0x87b23d3ae2643c8d instructions=59145258
+V4: capsule v4:forth79.4th signature: missing (unsigned)
+PARITY:V4_CAPSULE name=v4:forth79.4th capsule_id=0x4055641ee17d176b capsule_hash=0x4055641ee17d176b dict_hash=0x033e1c05c09a1df8
+PARITY:V4_POST tests=538 pass=538 fail=0
+PARITY:V4_SYSTEM word_count=317 dict_hash=0xfec8c47cfc6f437f
+PARITY:OK
+POST: PASSED
+PCI: init...
+PCI: ECAM mapped (amd64)
+virtio-blk: found device
+Artemis: virtio-blk attached
+Starting heartbeat...
+APIC Timer: started (LVT=0x00020020 ICR=10067081)
+I/O APIC: keyboard IRQ1 unmasked
+Heartbeat running.
+blkio_usb: MSC device ready
+[Hera] Zuse: identity confirmed from attached thumbdrive
+[zuse@Hera] ok> 3 4 + .
+[zuse@Hera] 7  ok
+[zuse@Hera] ok> 

logs/20261026-151916/aarch64/qemu-aarch64-20261026-151916.log

@@ -0,0 +1,128 @@
+UEFI firmware (version 2025.11-3ubuntu7.3 built at 15:40:26 on Sep 23 2026)
+[=3hBdsDxe: failed to load Boot0002 "UEFI Misc Device" from PciRoot(0x0)/Pci(0x2,0x0): Not Found
+BdsDxe: failed to load Boot0003 "UEFI QEMU QEMU USB HARDDRIVE 1-0000:00:04.0-1" from PciRoot(0x0)/Pci(0x4,0x0)/USB(0x0,0x0): Not Found
+BdsDxe: loading Boot0004 "UEFI Misc Device 2" from PciRoot(0x0)/Pci(0x6,0x0)
+BdsDxe: starting Boot0004 "UEFI Misc Device 2" from PciRoot(0x0)/Pci(0x6,0x0)
+[=3hStarKernel UEFI Loader
+Loading kernel from ESP...
+[CKPT 001] Entered efi_main - ConOut live
+Collecting boot information...
+[CKPT 004] Command line parsed
+[CKPT 005] Kernel stack allocation decided
+[CKPT 006] Boot info collected (ACPI table located)
+[CKPT 007] GOP: linear framebuffer found
+[CKPT 008] About to enter ExitBootServices retry loop
+
+
+   _____ _             _  __                    _ 
+  / ____| |           | |/ /                   | |
+ | (___ | |_ __ _ _ __| ' / ___ _ __ _ __   ___| |
+  \___ \| __/ _` | '__|  < / _ \ '__| '_ \ / _ \ |
+  ____) | || (_| | |  | . \  __/ |  | | | |  __/ |
+ |_____/ \__\__,_|_|  |_|\_\___|_|  |_| |_|\___|_|
+
+LithosAnanke v2.1.0 aarch64
+Architecture: aarch64
+Build: Oct 26 2026 15:19:14
+
+UEFI BootServices: EXITED
+Console: serial line is a PL011 at 0x0000000009000000 (no devicetree: QEMU's)
+
+=== StarKernel Boot Information ===
+Memory map entries: 108
+Total memory: 4093 MB
+Usable memory: 4054 MB
+===================================
+
+PMM initialized.
+PMM statistics:
+  Total pages: 1039284
+  Free pages : 1037873
+  Used pages : 1411
+  Total MB   : 4059
+  Free  MB   : 4054
+  Used  MB   : 5
+
+VMM initialized (mapped RAM, CR3 switched)
+VMM initialized (mapped RAM, CR3 switched)
+VMM self-test: mapped OK at 0xffff800000000000
+VMM self-test complete.
+
+AArch64: running at EL1
+IDT installed.
+
+APIC: init...
+PSCI: no DTB -- using HVC (QEMU virt-machine default)
+GICv2: no DTB GIC node -- using QEMU virt-machine defaults
+GICv2: distributor+CPU interface enabled, PPI 30
+APIC: init done
+
+Timer: init...
+Timer: AArch64 generic timer initialised.
+Timer: init done
+
+Kernel heap initialized.
+Heap statistics:
+  Total bytes: 2147483608
+  Free  bytes: 2147483608
+  Used  bytes: 0
+  Peak  bytes: 0
+  Heap base addr: 1207959552
+  Heap end  addr: 3355443200
+
+Heartbeat: init...
+Heartbeat: init done
+Kernel initialization complete.
+Boot successful!
+
+System: StarForth v4 (this build's default)
+StarForth v4: one host node, the F18-derived engine
+V4: capsule v4:sys:map-64.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:map-64.f18 capsule_hash=0x949eb6a1e9260e49
+V4: capsule v4:sys:core.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:core.f18 capsule_hash=0xb8f167892ec18c28
+V4: capsule v4:sys:input.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:input.f18 capsule_hash=0x85d3ec486d929a79
+V4: capsule v4:sys:dict.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:dict.f18 capsule_hash=0x1379bd3b5de811dc
+V4: capsule v4:sys:codegen.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:codegen.f18 capsule_hash=0x36d2ae84d2911b90
+V4: capsule v4:sys:compile.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:compile.f18 capsule_hash=0x11145c4c2ab819d8
+V4: capsule v4:sys:quit.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:quit.f18 capsule_hash=0x43cadf3b21ddbf3e
+V4: capsule v4:sys:forth.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:forth.f18 capsule_hash=0x16cab4a1268b85da
+V4: capsule v4:sys:numout.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:numout.f18 capsule_hash=0x85a240ad3fb2b299
+V4: capsule v4:sys:words.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:words.f18 capsule_hash=0xb1d381f927d9f14e
+V4: capsule v4:sys:system.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:system.f18 capsule_hash=0xd92203664c2915bd
+V4: capsule v4:sys:qmath.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:qmath.f18 capsule_hash=0xdb4140713dd857f3
+V4: capsule v4:sys:blocks.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:blocks.f18 capsule_hash=0x76307ef48678dc2a
+V4: capsule v4:sys:log.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:log.f18 capsule_hash=0xfc6540e6b824a52b
+V4: capsule v4:sys:acl.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:acl.f18 capsule_hash=0x6845aa048db7eb22
+V4: capsule v4:sys:end.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:end.f18 capsule_hash=0x5ef01312c07b79cc
+PARITY:V4_ROM words=2372 rom_hash=0x87b23d3ae2643c8d instructions=59145258
+V4: capsule v4:forth79.4th signature: missing (unsigned)
+PARITY:V4_CAPSULE name=v4:forth79.4th capsule_id=0x4055641ee17d176b capsule_hash=0x4055641ee17d176b dict_hash=0x033e1c05c09a1df8
+PARITY:V4_POST tests=538 pass=538 fail=0
+PARITY:V4_SYSTEM word_count=317 dict_hash=0xfec8c47cfc6f437f
+PARITY:OK
+POST: PASSED
+PCI: init...
+virtio-blk: found device
+Artemis: virtio-blk attached
+Starting heartbeat...
+Heartbeat running.
+blkio_usb: MSC device ready
+[Hera] Zuse: identity confirmed from attached thumbdrive
+[zuse@Hera] ok> 3 4 + .
+[zuse@Hera] 7  ok
+[zuse@Hera] ok> 

logs/20261026-152247/riscv64/qemu-riscv64-20261026-152247.log

@@ -0,0 +1,199 @@
+
+OpenSBI v1.8
+   ____                    _____ ____ _____
+  / __ \                  / ____|  _ \_   _|
+ | |  | |_ __   ___ _ __ | (___ | |_) || |
+ | |  | | '_ \ / _ \ '_ \ \___ \|  _ < | |
+ | |__| | |_) |  __/ | | |____) | |_) || |_
+  \____/| .__/ \___|_| |_|_____/|____/_____|
+        | |
+        |_|
+
+Platform Name               : riscv-virtio,qemu
+Platform Features           : medeleg
+Platform HART Count         : 1
+Platform HART Protection    : pmp
+Platform IPI Device         : aclint-mswi
+Platform Timer Device       : aclint-mtimer @ 10000000Hz
+Platform Console Device     : uart8250
+Platform HSM Device         : ---
+Platform PMU Device         : ---
+Platform Reboot Device      : syscon-reboot
+Platform Shutdown Device    : syscon-poweroff
+Platform Suspend Device     : ---
+Platform CPPC Device        : ---
+Firmware Base               : 0x80000000
+Firmware Size               : 321 KB
+Firmware RW Offset          : 0x40000
+Firmware RW Size            : 65 KB
+Firmware Heap Offset        : 0x47000
+Firmware Heap Size          : 37 KB (total), 0 KB (reserved), 12 KB (used), 23 KB (free)
+Firmware Scratch Size       : 4096 B (total), 1464 B (used), 2632 B (free)
+Runtime SBI Version         : 3.0
+Standard SBI Extensions     : ipi,pmu,srst,sse,hsm,rfnc,fwft,time,base,legacy,dbcn,dbtr
+Experimental SBI Extensions : none
+
+Domain0 Name                : root
+Domain0 Boot HART           : 0
+Domain0 HARTs               : 0*
+Domain0 Region00            : 0x0000000080040000-0x000000008005ffff M: (F,R,W) S/U: ()
+Domain0 Region01            : 0x0000000080000000-0x000000008003ffff M: (F,R,X) S/U: ()
+Domain0 Region02            : 0x0000000000100000-0x0000000000100fff M: (I,R,W) S/U: (R,W)
+Domain0 Region03            : 0x0000000010000000-0x0000000010000fff M: (I,R,W) S/U: (R,W)
+Domain0 Region04            : 0x0000000002000000-0x000000000200ffff M: (I,R,W) S/U: ()
+Domain0 Region05            : 0x000000000c400000-0x000000000c5fffff M: (I,R,W) S/U: (R,W)
+Domain0 Region06            : 0x000000000c000000-0x000000000c3fffff M: (I,R,W) S/U: (R,W)
+Domain0 Region07            : 0x0000000000000000-0xffffffffffffffff M: () S/U: (R,W,X)
+Domain0 Next Address        : 0x0000000020000000
+Domain0 Next Arg1           : 0x00000000bfe00000
+Domain0 Next Mode           : S-mode
+Domain0 SysReset            : yes
+Domain0 SysSuspend          : yes
+
+Boot HART ID                : 0
+Boot HART Domain            : root
+Boot HART Priv Version      : v1.12
+Boot HART Base ISA          : rv64imafdch
+Boot HART ISA Extensions    : sstc,zicntr,zihpm,zicboz,zicbom,sdtrig,svadu
+Boot HART PMP Count         : 16
+Boot HART PMP Granularity   : 2 bits
+Boot HART PMP Address Bits  : 54
+Boot HART MHPM Info         : 16 (0x0007fff8)
+Boot HART Debug Triggers    : 2 triggers
+Boot HART MIDELEG           : 0x0000000000001666
+Boot HART MEDELEG           : 0x0000000000f4b509
+[=3hRISC-V EDK2 firmware version 2025.11-3ubuntu7.3
+Press ESCAPE within 5 seconds for boot options ERROR: C40000002:V03051002 I0 6D33944A-EC75-4855-A54D-809C75241F6C 83FFF850
+BdsDxe: failed to load Boot0001 "UEFI Misc Device" fr
+om PciRoot(0x0)/Pci(0x1,0x0): Not Found
+[=3hStarKernel UEFI Loader
+Loading kernel from ESP...
+[CKPT 001] Entered efi_main - ConOut live
+Monolithic build - kernel linked directly
+Collecting boot information...
+CmdLine: parsed OK
+[CKPT 004] Command line parsed
+[CKPT 005] Kernel stack allocation decided
+[CKPT 006] Boot info collected (ACPI table located)
+GOP: linear framebuffer found
+[CKPT 007] GOP: linear framebuffer found
+[CKPT 008] About to enter ExitBootServices retry loop
+Calling kernel_main (monolithic)...
+riscv64 item 4.3.5a: satp state at kernel entry (before switch)
+  satp.MODE = 0x000000000000000a
+  satp.PPN  = 0x00000000000bf868
+  __kernel_start = 0x00000000bdc2a678
+riscv64: satp cleared -- Bare mode, explicit (item 4.3.5a)
+
+
+   _____ _             _  __                    _ 
+  / ____| |           | |/ /                   | |
+ | (___ | |_ __ _ _ __| ' / ___ _ __ _ __   ___| |
+  \___ \| __/ _` | '__|  < / _ \ '__| '_ \ / _ \ |
+  ____) | || (_| | |  | . \  __/ |  | | | |  __/ |
+ |_____/ \__\__,_|_|  |_|\_\___|_|  |_| |_|\___|_|
+
+LithosAnanke v2.1.0 riscv64
+Architecture: riscv64
+Build: Oct 26 2026 15:22:42
+
+UEFI BootServices: EXITED
+Console: serial line is a 16550 at 0x0000000010000000 (no devicetree: QEMU's)
+
+=== StarKernel Boot Information ===
+Memory map entries: 100
+Total memory: 1020 MB
+Usable memory: 974 MB
+===================================
+
+PMM initialized.
+PMM statistics:
+  Total pages: 250205
+  Free pages : 249553
+  Used pages : 652
+  Total MB   : 977
+  Free  MB   : 974
+  Used  MB   : 2
+
+VMM initialized (mapped RAM, CR3 switched)
+VMM initialized (mapped RAM, CR3 switched)
+VMM self-test: mapped OK at 0xffff800000000000
+VMM self-test complete.
+
+IDT installed.
+
+APIC: init...
+PLIC: no DTB PLIC node -- using QEMU virt-machine default (base=0x0c000000)
+PLIC: init (S-mode context 1, threshold=0)
+APIC: init done
+
+Timer: init...
+Timer: RISC-V time CSR @ 10000000 Hz (FALLBACK, no devicetree)
+Timer: init done
+
+Kernel heap initialized.
+Heap statistics:
+  Total bytes: 536870872
+  Free  bytes: 536870872
+  Used  bytes: 0
+  Peak  bytes: 0
+  Heap base addr: 2214588416
+  Heap end  addr: 2751459328
+
+Heartbeat: init...
+Heartbeat: init done
+Kernel initialization complete.
+Boot successful!
+
+System: StarForth v4 (this build's default)
+StarForth v4: one host node, the F18-derived engine
+V4: capsule v4:sys:map-64.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:map-64.f18 capsule_hash=0x949eb6a1e9260e49
+V4: capsule v4:sys:core.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:core.f18 capsule_hash=0xb8f167892ec18c28
+V4: capsule v4:sys:input.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:input.f18 capsule_hash=0x85d3ec486d929a79
+V4: capsule v4:sys:dict.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:dict.f18 capsule_hash=0x1379bd3b5de811dc
+V4: capsule v4:sys:codegen.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:codegen.f18 capsule_hash=0x36d2ae84d2911b90
+V4: capsule v4:sys:compile.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:compile.f18 capsule_hash=0x11145c4c2ab819d8
+V4: capsule v4:sys:quit.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:quit.f18 capsule_hash=0x43cadf3b21ddbf3e
+V4: capsule v4:sys:forth.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:forth.f18 capsule_hash=0x16cab4a1268b85da
+V4: capsule v4:sys:numout.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:numout.f18 capsule_hash=0x85a240ad3fb2b299
+V4: capsule v4:sys:words.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:words.f18 capsule_hash=0xb1d381f927d9f14e
+V4: capsule v4:sys:system.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:system.f18 capsule_hash=0xd92203664c2915bd
+V4: capsule v4:sys:qmath.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:qmath.f18 capsule_hash=0xdb4140713dd857f3
+V4: capsule v4:sys:blocks.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:blocks.f18 capsule_hash=0x76307ef48678dc2a
+V4: capsule v4:sys:log.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:log.f18 capsule_hash=0xfc6540e6b824a52b
+V4: capsule v4:sys:acl.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:acl.f18 capsule_hash=0x6845aa048db7eb22
+V4: capsule v4:sys:end.f18 signature: missing (unsigned)
+PARITY:V4_F18 name=v4:sys:end.f18 capsule_hash=0x5ef01312c07b79cc
+PARITY:V4_ROM words=2372 rom_hash=0x87b23d3ae2643c8d instructions=59145258
+V4: capsule v4:forth79.4th signature: missing (unsigned)
+PARITY:V4_CAPSULE name=v4:forth79.4th capsule_id=0x4055641ee17d176b capsule_hash=0x4055641ee17d176b dict_hash=0x033e1c05c09a1df8
+PARITY:V4_POST tests=538 pass=538 fail=0
+PARITY:V4_SYSTEM word_count=317 dict_hash=0xfec8c47cfc6f437f
+PARITY:OK
+POST: PASSED
+PCI: init...
+virtio-blk: found device
+Artemis: virtio-blk attached
+Starting heartbeat...
+SBI: timer armed (TIME extension)
+Heartbeat running.
+blkio_usb: MSC device ready
+[Hera] Zuse: identity confirmed from attached thumbdrive
+[zuse@Hera] ok> 3 4 + .
+[zuse@Hera] 7  ok
+[zuse@Hera] ok>