/* StarForth — Steady-State Virtual Machine Runtime Copyright (c) 2023–2025 Robert A. James All rights reserved. Licensed under the StarForth License, Version 1.0 (the "License"); you may not use this file except in compliance with the License. */ /** * kernel_main.c - StarKernel main entry point (LithosAnanke branch) * * Milestone status: * M0-M5: Complete (build, boot, PMM, VMM, interrupts, timer) * M6: Infrastructure present (kmalloc exists, validation deferred) * M7: Not started (VM integration pending) */ #ifndef __STARKERNEL__ #error "__STARKERNEL__ must be defined for kernel build" #endif #include "uefi.h" #include "console.h" #include "arch.h" #include "pmm.h" #include "vmm.h" #include "apic.h" #include "timer.h" #include "kmalloc.h" #include "starkernel/kernel_args.h" /** * @brief UEFI Runtime Services pointer — set once at M6 init, valid for kernel lifetime. * * Populated from @c boot_info->runtime_services just before the kernel heap is * initialised (between the M5 timer init and @c kernel_main_deep()). Declared * @c extern in the UEFI header so kernel FORTH words (e.g. @c REBOOT) can * access it without including the full @c kernel_main.c translation unit. * * Validity note: UEFI Runtime Services remain valid in physical mode after * @c ExitBootServices(). This kernel does not call @c SetVirtualAddressMap(), * so the pointer is the raw physical address returned by firmware. On QEMU/OVMF * this is always usable; on real hardware it is valid as long as the CPU is in * physical mode (identity-mapped) — which it is for the duration of LithosAnanke, * since the VMM uses a separate TTBR/CR3 but does not remap the EFI reserved * regions. */ EFI_RUNTIME_SERVICES *g_sk_runtime_services = NULL; #ifdef STARFORTH_ENABLE_VM #include "starkernel/vm/bootstrap/sk_vm_bootstrap.h" #include "starkernel/vm/parity.h" #include "starkernel/capsule_generated.h" #include "starkernel/capsule_loader.h" #include "starkernel/capsule_birth.h" /* capsule_birth_mama, capsule_find_mama_init */ #include "starkernel/kmalloc.h" #include "starkernel/repl.h" #include "starkernel/pci.h" #include "starkernel/virtio_blk.h" #include "block_subsystem.h" #include "vm.h" /* DictEntry, vm_find_word, ACL_MODE_STRICT */ #include "version.h" #endif /* Forward declaration — kernel_main_deep contains everything from heartbeat * init onward. The 2 MB BSS stack is set up by kernel_entry.S before * kernel_main_impl is called, so no further stack switch is needed. */ static void kernel_main_deep(BootInfo *boot_info); /** * @brief Return non-zero if the EFI memory type represents usable or reclaimable RAM. * * Covers all UEFI memory types that either are immediately usable by the PMM or * can be reclaimed once Boot Services have exited: * - @c EfiConventionalMemory — general purpose RAM. * - @c EfiLoaderCode / @c EfiLoaderData — UEFI loader pages (reclaimed post-EBS). * - @c EfiBootServicesCode / @c EfiBootServicesData — boot-service pages (reclaimed post-EBS). * - @c EfiRuntimeServicesCode / @c EfiRuntimeServicesData — pages the firmware * still uses for runtime calls (kept mapped, counted as physical RAM). * - @c EfiACPIReclaimMemory — ACPI tables; may be freed after OS has parsed them. * - @c EfiACPIMemoryNVS — non-volatile ACPI storage; kept reserved but is RAM. * * Returns 0 for all device-memory, MMIO, persistent-memory, and special types. * Used by @c print_boot_info() to compute the total physical RAM visible in the * EFI memory map. * * @param type @c EFI_MEMORY_TYPE value from an @c EFI_MEMORY_DESCRIPTOR. * @return Non-zero if the type is RAM; 0 otherwise. */ static int is_ram_type(uint32_t type) { return type == EfiConventionalMemory || type == EfiLoaderCode || type == EfiLoaderData || type == EfiBootServicesCode || type == EfiBootServicesData || type == EfiRuntimeServicesCode || type == EfiRuntimeServicesData || type == EfiACPIReclaimMemory || type == EfiACPIMemoryNVS; } /** * @brief Convert a @c uint64_t to a NUL-terminated string in the given base. * * Produces a freestanding (no libc) integer-to-string conversion for the * kernel console paths. Handles bases 2–16; digits above 9 are lowercase * alphabetic (@c 'a'–@c 'f' for hex). Special case: @p value == 0 writes * the string @c "0" and returns immediately. * * The algorithm builds the digit string in reverse order into a 64-byte * local @c temp[] buffer, then reverses it into @p buf. @p buf must be at * least 65 bytes to hold a 64-bit binary string plus NUL; in practice all * callers pass 64-byte buffers and use base 10 or 16, where the maximum * length is 20 or 16 digits respectively. * * @param value Non-negative integer to convert. * @param buf Caller-allocated output buffer (minimum 65 bytes for binary). * @param base Numeric base (2–16). */ static void itoa_simple(uint64_t value, char *buf, int base) { char temp[64]; int i = 0; int j; if (value == 0) { buf[0] = '0'; buf[1] = '\0'; return; } while (value > 0) { int digit = (int)(value % (uint64_t)base); temp[i++] = (digit < 10) ? (char)('0' + digit) : (char)('a' + digit - 10); value /= (uint64_t)base; } for (j = 0; j < i; j++) { buf[j] = temp[i - j - 1]; } buf[j] = '\0'; } /** * @brief Print an optional label followed by a @c uint64_t in decimal to the console. * * Converts @p value to a decimal string via @c itoa_simple() and emits it with * a trailing newline via @c console_println(). If @p label is non-NULL, it is * emitted first via @c console_puts() (no newline between label and value). * Used by @c print_pmm_stats() and @c print_heap_stats() to avoid repeating * the convert-and-print pattern for each statistic line. * * @param label Optional NUL-terminated prefix string; NULL to omit. * @param value 64-bit unsigned integer to display in decimal. */ static void print_uint(const char *label, uint64_t value) { char buf[64]; if (label) { console_puts(label); } itoa_simple(value, buf, 10); console_println(buf); } /** * @brief Print a boot-information summary from the UEFI memory map to the console. * * Iterates over every @c EFI_MEMORY_DESCRIPTOR in @c boot_info->memory_map and * accumulates: * - @c total_memory — sum of page sizes for all RAM-type regions * (via @c is_ram_type()). * - @c usable_memory — sum of page sizes for @c EfiConventionalMemory only. * * Emits a three-field report box to the kernel serial console: * - "Memory map entries: N" * - "Total memory: N MB" (rounds down to whole MiB) * - "Usable memory: N MB" * * Called from @c kernel_main_impl() / @c kernel_main() immediately after M1 * console initialisation, so the memory map must still be intact (it always * is — the map was captured by @c uefi_loader.c before @c ExitBootServices()). * * @param boot_info @c BootInfo structure populated by @c uefi_loader.c; provides * @c memory_map, @c memory_map_size, and * @c memory_map_descriptor_size. */ static void print_boot_info(BootInfo *boot_info) { char buf[64]; UINTN num_entries; UINTN total_memory = 0; UINTN usable_memory = 0; UINTN i; console_println("\n=== StarKernel Boot Information ==="); num_entries = boot_info->memory_map_size / boot_info->memory_map_descriptor_size; for (i = 0; i < num_entries; i++) { EFI_MEMORY_DESCRIPTOR *desc = (EFI_MEMORY_DESCRIPTOR *)((uint8_t *)boot_info->memory_map + i * boot_info->memory_map_descriptor_size); UINTN size = desc->NumberOfPages * 4096u; if (is_ram_type(desc->Type)) { total_memory += size; } if (desc->Type == EfiConventionalMemory) { usable_memory += size; } } console_puts("Memory map entries: "); itoa_simple(num_entries, buf, 10); console_println(buf); console_puts("Total memory: "); itoa_simple((uint64_t)(total_memory / (1024u * 1024u)), buf, 10); console_puts(buf); console_println(" MB"); console_puts("Usable memory: "); itoa_simple((uint64_t)(usable_memory / (1024u * 1024u)), buf, 10); console_puts(buf); console_println(" MB"); console_println("===================================\n"); } /** * @brief Print Physical Memory Manager statistics to the kernel console. * * Calls @c pmm_get_stats() to obtain a @c pmm_stats_t snapshot and then emits * six lines via @c print_uint(): * - Total pages, free pages, used pages (in 4 KiB page units). * - Total MB, free MB, used MB (bytes ÷ 1 MiB, truncated). * * Called from @c kernel_main_impl() / @c kernel_main() immediately after * @c pmm_init() completes (M2), providing a sanity check that the PMM saw the * expected quantity of physical RAM. */ static void print_pmm_stats(void) { pmm_stats_t stats = pmm_get_stats(); console_println("PMM statistics:"); print_uint(" Total pages: ", stats.total_pages); print_uint(" Free pages : ", stats.free_pages); print_uint(" Used pages : ", stats.used_pages); print_uint(" Total MB : ", stats.total_bytes / (1024u * 1024u)); print_uint(" Free MB : ", stats.free_bytes / (1024u * 1024u)); print_uint(" Used MB : ", stats.used_bytes / (1024u * 1024u)); console_println(""); } /** * @brief Print kernel heap (kmalloc) statistics to the kernel console. * * Calls @c kmalloc_get_stats() to obtain a @c kmalloc_stats_t snapshot and * emits four lines via @c print_uint(): * - Total bytes allocated to the heap arena. * - Free bytes currently available. * - Used bytes currently allocated by callers. * - Peak bytes — the high-water mark since @c kmalloc_init(). * * Called from @c kernel_main_impl() / @c kernel_main() immediately after * @c kmalloc_init() (M6) to confirm that the heap was sized correctly from the * @c --heap= boot argument or its 2 GiB default. */ static void print_heap_stats(void) { kmalloc_stats_t stats = kmalloc_get_stats(); console_println("Heap statistics:"); print_uint(" Total bytes: ", stats.total_bytes); print_uint(" Free bytes: ", stats.free_bytes); print_uint(" Used bytes: ", stats.used_bytes); print_uint(" Peak bytes: ", stats.peak_bytes); console_println(""); } /** * @brief Print the StarKernel ASCII-art banner and build metadata to the console. * * Emits: * - The "StarKernel" ASCII-art logotype (six-line block font). * - @c LITHOS_VERSION_STR — the @c LithosAnanke version string from @c version.h. * - Target ISA: "amd64", "aarch64", "riscv64", or "unknown", selected by * compile-time @c ARCH_* / @c __riscv preprocessor guards. * - Build date and time from @c __DATE__ / @c __TIME__ (compiler intrinsics). * - "UEFI BootServices: EXITED" — confirmation that the kernel is running * after @c ExitBootServices() and owns all hardware. * * Called first in @c kernel_main_impl() / @c kernel_main() after * @c console_init() so the banner is the first visible output on the serial * port, matching the @c QEMU_BASELINE.log reference. */ static void print_banner(void) { console_println(""); console_println(""); console_println(" _____ _ _ __ _ "); console_println(" / ____| | | |/ / | |"); console_println(" | (___ | |_ __ _ _ __| ' / ___ _ __ _ __ ___| |"); console_println(" \\___ \\| __/ _` | '__| < / _ \\ '__| '_ \\ / _ \\ |"); console_println(" ____) | || (_| | | | . \\ __/ | | | | | __/ |"); console_println(" |_____/ \\__\\__,_|_| |_|\\_\\___|_| |_| |_|\\___|_|"); console_println(""); console_println(LITHOS_VERSION_STR); #if defined(ARCH_AMD64) console_println("Architecture: amd64"); #elif defined(ARCH_AARCH64) console_println("Architecture: aarch64"); #elif defined(__riscv) console_println("Architecture: riscv64"); #else console_println("Architecture: unknown"); #endif console_puts("Build: "); console_puts(__DATE__); console_puts(" "); console_println(__TIME__); console_println(""); console_println("UEFI BootServices: EXITED"); } /** * @brief Main kernel entry point after UEFI handoff — executes milestones M0–M6. * * On amd64 and riscv64, @c kernel_entry.S switches the stack from UEFI's default * to a 2 MiB zero-initialised BSS stack and tail-calls this function as * @c kernel_main_impl. On aarch64 the assembly trampoline is not yet implemented * and the UEFI loader calls @c kernel_main directly. * * Milestone sequence: * - **M0 — Architecture early init** (@c arch_early_init()): On amd64, installs a * minimal GDT with a proper 64-bit code segment at selector 0x08 and reloads CS * via @c lretq. Without this, UEFI's 64-bit segment at 0x38 is in scope and the * ISR's @c INT gate (which expects CS 0x08) would fault silently. * - **M1 — Console** (@c console_init()): brings up UART 16550 at 115200 8N1 and * the framebuffer VT100 terminal. Then prints banner and memory map. * - **M2 — PMM** (@c pmm_init()): initialises the physical memory manager's 4 KiB * page bitmap from the EFI memory map. * - **M3 — VMM** (@c vmm_init()): builds 4-level x86-64 page tables, maps all * conventional RAM at the kernel virtual base, and loads CR3. * - **M4 — IDT + APIC** (@c arch_interrupts_init() + @c apic_init()): programs the * 64-entry IDT, masks the legacy 8259A PIC, and initialises the Local APIC in * xAPIC MMIO mode at 0xFEE00000. * - **M5 — Timer** (@c timer_init()): calibrates the TSC and HPET. * - **M6 — Heap** (@c kmalloc_init()): initialises the kernel slab allocator with * @c heap_size from the boot args or @c KARGS_DEFAULT_HEAP_SIZE (2 GiB). * * Stashes @c boot_info->runtime_services in @c g_sk_runtime_services for later * use by kernel FORTH words (e.g. @c REBOOT). Then tail-calls * @c kernel_main_deep() for M7 and the REPL. * * @param boot_info @c BootInfo populated by @c uefi_loader.c before * @c ExitBootServices(); provides the memory map, ACPI pointer, * framebuffer descriptor, runtime services pointer, and parsed * kernel command-line arguments. */ #if defined(__x86_64__) || defined(__riscv) void kernel_main_impl(BootInfo *boot_info) { #else void kernel_main(BootInfo *boot_info) { #endif /* * Establish our own GDT before anything else. UEFI hands us CS=0x38 * (OVMF's 64-bit segment at GDT[7]). Our IDT entries use selector 0x08, * so if UEFI's GDT[1] (0x08) is not a valid 64-bit code descriptor the * ISR will run with the wrong CS type and all serial output from the ISR * will fail silently. arch_early_init() installs a minimal GDT with a * proper 64-bit code segment at 0x08 and reloads CS via lretq. */ arch_early_init(); /* M1: Console initialization — serial UART first */ console_init(); print_banner(); print_boot_info(boot_info); /* M2: Physical Memory Manager */ pmm_init(boot_info); console_println("PMM initialized."); print_pmm_stats(); /* M3: Virtual Memory Manager */ vmm_init(boot_info); console_println("VMM initialized (mapped RAM, CR3 switched)"); console_println("VMM self-test: mapped OK at 0xffff800000000000"); console_println("VMM self-test complete.\n"); /* M4: Interrupt handling */ arch_interrupts_init(); console_println("IDT installed.\n"); /* M4: APIC */ console_println("APIC: init..."); apic_init(boot_info); console_println("APIC: init done\n"); /* M5: Timer subsystem */ console_println("Timer: init..."); timer_init(boot_info); console_println("Timer: init done\n"); /* Stash runtime services for REBOOT word and other kernel FORTH words */ g_sk_runtime_services = boot_info->runtime_services; /* M6: Kernel heap — sized from --heap= flag, default 2 GiB */ { uint64_t heap_sz = boot_info->args.heap_size ? boot_info->args.heap_size : KARGS_DEFAULT_HEAP_SIZE; kmalloc_init(heap_sz); } console_println("Kernel heap initialized."); print_heap_stats(); /* Hand off to the deep initialization path. The 2 MiB BSS stack was * already set up by kernel_entry.S (amd64) before this function was * called, so no further stack switch is needed here. */ kernel_main_deep(boot_info); } /** * @brief Deep kernel initialisation — M5 heartbeat, M7 VM bootstrap, and REPL. * * Called as the final act of @c kernel_main_impl() / @c kernel_main() after * all hardware milestones M0–M6 are complete. Runs on the 2 MiB BSS stack on * amd64 (set up by @c kernel_entry.S before @c kernel_main_impl() was called) * or the UEFI-provided stack on aarch64 and riscv64. * * **M5 — Heartbeat subsystem:** * Calls @c apic_timer_init(tsc_hz, 100) to configure the APIC timer for 100 Hz * periodic delivery to vector 32, then @c heartbeat_init(tsc_hz, 100) to * initialise the rolling-window heartbeat state. * * **M7 — VM bootstrap (when @c STARFORTH_ENABLE_VM is defined):** * 1. @c sk_vm_bootstrap_parity() — allocates the Mama VM and validates the * capsule directory parity. * 2. Allocates 1 MiB @c blk_ram_buf (LBN 0–991) and 1 MiB @c krd_buf * (LBN 2048–3071 = capsule ramdrive) from @c kmalloc, then calls * @c capsule_blk_init() to wire them into the Mama VM's block subsystem. * 3. Copies the read-only @c capsule_arena to heap and calls * @c capsule_exec_init() to load and execute @c init.4th. * 4. Pins @c CAPSULE-BIRTH and @c BIRTH with @c ACL_MODE_STRICT via * @c vm_find_word() so that ACL policy cannot downgrade them. * * After M7, the APIC timer is started via @c apic_timer_start() and * @c arch_enable_interrupts() enables IRQs. * * **REPL (when @c STARFORTH_ENABLE_VM is defined):** * - If @c boot_info->args.run_doe is set, injects @c "12345 3 EXEC-DOE BYE" * before the interactive REPL. * - If @c SK_STARTUP_FORTH is defined at build time, executes it as a * compile-time startup script (lowest priority — overridden by @c --doe). * - Activates the framebuffer VT100 terminal (if the framebuffer descriptor * is valid) so the REPL output appears on screen as well as the serial port. * - Clears the @c StarForthRebootTries NVRAM variable to signal a clean boot. * - Calls @c sk_repl() — the interactive FORTH REPL loop. Returns when the * user executes @c BYE or @c vm->halted is set. * * Terminates with an infinite @c arch_halt() idle loop regardless of the * @c STARFORTH_ENABLE_VM build configuration. * * @param boot_info The @c BootInfo passed from @c kernel_main_impl(). */ static void kernel_main_deep(BootInfo *boot_info) { /* M5: Initialize heartbeat subsystem */ console_println("Heartbeat: init..."); uint64_t tsc_hz = timer_tsc_hz(); if (apic_timer_init(tsc_hz, 100) != 0) { console_println("APIC Timer initialization failed."); } heartbeat_init(tsc_hz, 100); /* 100 Hz tick rate */ console_println("Heartbeat: init done"); console_println("Kernel initialization complete."); console_println("Boot successful!\n"); #ifdef STARFORTH_ENABLE_VM /* M7: VM Bootstrap and Parity Validation */ console_println("VM: bootstrap parity..."); ParityPacket parity_pkt; int vm_rc = sk_vm_bootstrap_parity(&parity_pkt); if (vm_rc != 0) { console_println("VM: parity bootstrap FAILED"); } else { console_println("VM: parity bootstrap complete"); } /* Wire parity log so PARITY:MAMA_INIT/BIRTH/RUN/KILL reach serial */ capsule_parity_set_output(NULL, console_puts); /* M7.1: Execute init.4th via the proper Mama birth protocol. * capsule_arena lives in .rodata; copy to heap so the interpreter * can safely read payload bytes after VMM takeover. */ void *mama_vm = sk_get_mama_vm(); /* Block subsystem: fast RAM (LBN 0..2047) + ramdrive (LBN 2048..3071). * BLK_RAM_SIZE must cover BLK_RAM_BLOCKS × BLK_FORTH_SIZE. */ #define BLK_RAM_SIZE (BLK_RAM_BLOCKS * BLK_FORTH_SIZE) uint8_t *blk_ram_buf = (uint8_t *)kmalloc(BLK_RAM_SIZE); /* Kernel ramdrive: 1024 blocks × 1 KiB covering LBN 2048-3071 */ #define KRD_BUF_SIZE (1024u * 1024u) uint8_t *krd_buf = (uint8_t *)kmalloc(KRD_BUF_SIZE); if (!blk_ram_buf || !krd_buf) { console_println("Init: blk alloc FAILED"); } else { /* Pre-zero the ramdrive buffer (no memset in freestanding context) */ size_t krd_i; for (krd_i = 0; krd_i < KRD_BUF_SIZE; krd_i++) krd_buf[krd_i] = 0; /* Init block subsystem (RAM + ramdrive) */ capsule_blk_init(mama_vm, blk_ram_buf, BLK_RAM_SIZE, krd_buf); } /* M7.pre: PCI + Artemis virtio-blk disk — attached AFTER block subsystem init */ console_println("PCI: init..."); pci_init(boot_info->acpi_table); { static blkio_dev_t artemis_dev; int vrc = virtio_blk_find_artemis(&artemis_dev); if (vrc == 0) { console_println("Artemis: virtio-blk attached"); blk_subsys_attach_device(&artemis_dev); } else { console_println("Artemis: no virtio-blk disk (continuing without)"); } } /* Copy capsule directory header to heap (has pointer field needing update) */ CapsuleDirHeader *live_dir = (CapsuleDirHeader *)kmalloc(sizeof(CapsuleDirHeader)); if (!live_dir) { console_println("Init: dir alloc FAILED"); } else { const CapsuleDirHeader *src_dir = &capsule_directory; live_dir->magic = src_dir->magic; live_dir->arena_base = src_dir->arena_base; live_dir->arena_size = src_dir->arena_size; live_dir->desc_count = src_dir->desc_count; live_dir->desc_capacity = src_dir->desc_capacity; live_dir->name_count = src_dir->name_count; live_dir->reserved = src_dir->reserved; live_dir->dir_hash = src_dir->dir_hash; uint8_t *arena_copy = (uint8_t *)kmalloc((size_t)live_dir->arena_size); if (!arena_copy) { console_println("Init: arena alloc FAILED"); } else { const uint8_t *src = capsule_arena; uint8_t *dst = arena_copy; size_t n = (size_t)live_dir->arena_size; while (n--) *dst++ = *src++; live_dir->arena_base = (uint64_t)(uintptr_t)arena_copy; console_println("Init: Mama birth..."); CapsuleRunResult cr = capsule_birth_mama( mama_vm, live_dir, capsule_descriptors, capsule_names, arena_copy); if (cr == CAPSULE_RUN_OK) { console_println("Init: Mama birth OK"); /* Free ramdrive slots so init.4th blocks are available for userspace */ const CapsuleDesc *mama_cap = capsule_find_mama_init(live_dir, capsule_descriptors); if (mama_cap) capsule_clear_blocks(arena_copy + mama_cap->offset, mama_cap->length); } else { console_println("Init: Mama birth FAILED"); } /* Pin kernel-only privileged words that ACL.4th cannot reach * portably (BIRTH/CAPSULE-BIRTH do not exist in the hosted VM). * Done in C after capsule load so ACL.4th stays host-portable. */ VM *mama_vm_ptr = (VM *)sk_get_mama_vm(); DictEntry *capsule_birth = vm_find_word(mama_vm_ptr, "CAPSULE-BIRTH", 13); if (capsule_birth) { capsule_birth->acl_mode = ACL_MODE_STRICT; capsule_birth->acl_pinned = 1; console_println("ACL: CAPSULE-BIRTH pinned STRICT"); } DictEntry *birth = vm_find_word(mama_vm_ptr, "BIRTH", 5); if (birth) { birth->acl_mode = ACL_MODE_STRICT; birth->acl_pinned = 1; console_println("ACL: BIRTH pinned STRICT"); } } } #else console_println("=== LithosAnanke Checkpoint ==="); console_println("M0-M6: Complete"); console_println("M7: Disabled (build with STARFORTH_ENABLE_VM=1)"); console_println("================================\n"); #endif /* Start heartbeat and enable interrupts */ console_println("Starting heartbeat..."); apic_timer_start(); arch_enable_interrupts(); console_println("Heartbeat running."); #ifdef STARFORTH_ENABLE_VM VM *mama = (VM *)sk_get_mama_vm(); /* * Runtime --doe flag: inject "EXEC-DOE BYE" if requested via boot args. * Checked before SK_STARTUP_FORTH so a runtime --doe takes precedence. */ if (boot_info->args.run_doe) { console_println("Startup: --doe flag set — running EXEC-DOE"); vm_interpret(mama, "12345 3 EXEC-DOE BYE"); if (mama->error) { console_println("Startup: EXEC-DOE ERROR"); mama->error = 0; } if (mama->halted) goto idle; } /* * SK_STARTUP_FORTH — compile-time script injection (lowest priority). * Usage: make -f Makefile.starkernel qemu SK_CMD="TIME-TICKS . BYE" */ #ifdef SK_STARTUP_FORTH console_puts("Startup: "); console_println(SK_STARTUP_FORTH); vm_interpret(mama, SK_STARTUP_FORTH); if (mama->error) { console_puts("Startup: ERROR\n"); mama->error = 0; } if (mama->halted) goto idle; #endif /* Activate framebuffer VT100 now that POST is done — REPL-only */ if (boot_info->framebuffer.base != NULL && boot_info->framebuffer.size > 0) { FbPixelFormat fb_fmt; switch (boot_info->framebuffer.pixel_format) { case (UINT32)PixelRedGreenBlueReserved8BitPerColor: fb_fmt = FB_PIXEL_RGBX32; break; case (UINT32)PixelBlueGreenRedReserved8BitPerColor: fb_fmt = FB_PIXEL_BGRX32; break; default: fb_fmt = FB_PIXEL_BGRX32; break; } console_fb_init(&boot_info->framebuffer, fb_fmt); } /* Clear reboot-tries counter: we reached the REPL cleanly */ if (g_sk_runtime_services) { EFI_GUID vendor_guid = STARFORTH_VENDOR_GUID; EFI_SET_VARIABLE SetVariable = (EFI_SET_VARIABLE)g_sk_runtime_services->SetVariable; SetVariable( (CHAR16 *)SF_VAR_REBOOT_TRIES, &vendor_guid, EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS, 0, NULL); } /* Phase 0 acceptance (§25.1 item 0.10): "tick count non-zero" has to be * true, not merely likely -- the timer was just armed above, so with no * wait here the count depends on how much boot work happened to run * concurrently with interrupts enabled, which measured 1 tick on amd64 * and 0 on riscv64 in practice. Bounded busy-wait for a few real ticks * (not a virtual-tick construct; §16.4/§18.5 govern patron state, not * this one-time boot diagnostic) rather than reporting whatever count * happened to land. */ { uint64_t wait_start = heartbeat_ticks(); uint64_t spins = 0; while (heartbeat_ticks() - wait_start < 3 && spins < 100000000ULL) { arch_relax(); spins++; } } console_puts("Heartbeat: "); { char buf[24]; uint64_t v = heartbeat_ticks(); int i = 0, j = 0; char t[24]; if (v == 0) buf[i++] = '0'; else { while (v > 0) { t[j++] = (char)('0' + (v % 10)); v /= 10; } while (j > 0) buf[i++] = t[--j]; } buf[i] = '\0'; console_puts(buf); } console_puts(" ticks, trust=0x"); { char buf[9]; uint32_t v = (uint32_t)heartbeat_trust(); for (int k = 7; k >= 0; k--) { int nib = (int)((v >> (k * 4)) & 0xF); buf[7 - k] = (char)(nib < 10 ? '0' + nib : 'a' + nib - 10); } buf[8] = '\0'; console_puts(buf); } console_puts(", variance=0x"); { char buf[9]; uint32_t v = (uint32_t)heartbeat_state()->variance; for (int k = 7; k >= 0; k--) { int nib = (int)((v >> (k * 4)) & 0xF); buf[7 - k] = (char)(nib < 10 ? '0' + nib : 'a' + nib - 10); } buf[8] = '\0'; console_puts(buf); } console_println(""); sk_repl(mama); #endif /* Idle loop (reached if sk_repl exits via BYE or vm->halted) */ #ifdef STARFORTH_ENABLE_VM idle: #endif for (;;) { arch_halt(); } }