kernel: add framebuffer early console and tighten wait queues

Makefile

@@ -66,14 +66,14 @@ $(KERNEL_ELF): $(KERNEL_OBJS) $(ARCH_DIR)/kernel/linker.ld | dirs
 $(OVMF_VARS): | dirs
 	cp $(OVMF_VARS_TEMPLATE) $@
 
-run: $(BOOT_EFI) $(OVMF_VARS)
+run: $(BOOT_EFI) $(KERNEL_ELF) $(OVMF_VARS)
 	qemu-system-x86_64 \
 		-drive if=pflash,format=raw,readonly=on,file=$(OVMF_CODE) \
 		-drive if=pflash,format=raw,file=$(OVMF_VARS) \
 		-drive format=raw,file=fat:rw:$(BUILD_DIR)/image \
 		-serial stdio
 
-run-headless: $(BOOT_EFI) $(OVMF_VARS)
+run-headless: $(BOOT_EFI) $(KERNEL_ELF) $(OVMF_VARS)
 	rm -f $(DEBUG_LOG) $(SERIAL_LOG)
 	qemu-system-x86_64 \
 		-display none \

arch/x86/boot/Makefile

@@ -2,6 +2,7 @@ BOOT_SRCS := \
 	$(ARCH_DIR)/boot/main.c \
 	$(ARCH_DIR)/boot/file.c \
 	$(ARCH_DIR)/boot/elf_loader.c \
+	$(ARCH_DIR)/boot/framebuffer.c \
 	$(ARCH_DIR)/boot/memory_map.c \
 	$(ARCH_DIR)/boot/support.c
 

arch/x86/boot/framebuffer.c

@@ -0,0 +1,35 @@
+#include <tianole/boot_info.h>
+
+#include "efi.h"
+#include "framebuffer.h"
+
+efi_status boot_capture_framebuffer(
+	efi_system_table_t *system_table, boot_info_t *boot_info)
+{
+	efi_graphics_output_protocol_t *gop;
+	efi_graphics_output_mode_information_t *info;
+	efi_guid_t gop_guid = efi_graphics_output_protocol_guid();
+	efi_status status;
+
+	if (system_table == 0 || boot_info == 0) {
+		return EFI_INVALID_PARAMETER;
+	}
+
+	status = system_table->boot_services->locate_protocol(
+		&gop_guid, 0, (void **)&gop);
+	if (status != EFI_SUCCESS || gop == 0 || gop->mode == 0 ||
+		gop->mode->info == 0) {
+		return status;
+	}
+
+	info = gop->mode->info;
+	boot_info->framebuffer_base = gop->mode->frame_buffer_base;
+	boot_info->framebuffer_size = gop->mode->frame_buffer_size;
+	boot_info->framebuffer_width = info->horizontal_resolution;
+	boot_info->framebuffer_height = info->vertical_resolution;
+	boot_info->framebuffer_pixels_per_scan_line =
+		info->pixels_per_scan_line;
+	boot_info->framebuffer_pixel_format = info->pixel_format;
+
+	return EFI_SUCCESS;
+}

arch/x86/boot/framebuffer.h

@@ -0,0 +1,19 @@
+#ifndef X86_BOOT_FRAMEBUFFER_H
+#define X86_BOOT_FRAMEBUFFER_H
+
+#include <tianole/boot_info.h>
+
+#include "efi.h"
+
+/**
+ * boot_capture_framebuffer() - Copy GOP mode data into boot_info.
+ * @system_table: UEFI system table used to locate GOP.
+ * @boot_info: Kernel handoff structure updated on success.
+ *
+ * Failure is non-fatal for boot. The kernel keeps serial/debug-port logging if
+ * the firmware exposes no supported graphics output protocol.
+ */
+efi_status boot_capture_framebuffer(
+	efi_system_table_t *system_table, boot_info_t *boot_info);
+
+#endif

arch/x86/boot/main.c

@@ -4,6 +4,7 @@
 #include "efi.h"
 #include "elf_loader.h"
 #include "file.h"
+#include "framebuffer.h"
 #include "memory_map.h"
 
 static efi_char16_t boot_banner_text[] = u"Tianole x86 bootloader.\r\n";
@@ -24,6 +25,7 @@ efi_status EFIAPI efi_main(
 	system_table->con_out->output_string(
 		system_table->con_out, boot_banner_text);
 	boot_debug_log_puts("Tianole x86 bootloader loaded.\n");
+	(void)boot_capture_framebuffer(system_table, &boot_info);
 
 	status = boot_read_file(image_handle,
 		system_table,

arch/x86/include/efi.h

@@ -29,6 +29,9 @@ typedef uint64_t efi_physical_address_t;
 #define EFI_LOADED_IMAGE_PROTOCOL_GUID_A 0x5b1b31a1
 #define EFI_LOADED_IMAGE_PROTOCOL_GUID_B 0x9562
 #define EFI_LOADED_IMAGE_PROTOCOL_GUID_C 0x11d2
+#define EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID_A 0x9042a9de
+#define EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID_B 0x23dc
+#define EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID_C 0x4a38
 
 #if defined(__x86_64__)
 #define EFIAPI __attribute__((ms_abi))
@@ -58,6 +61,7 @@ typedef struct efi_simple_file_system_protocol
 	efi_simple_file_system_protocol_t;
 typedef struct efi_file_protocol efi_file_protocol_t;
 typedef struct efi_loaded_image_protocol efi_loaded_image_protocol_t;
+typedef struct efi_graphics_output_protocol efi_graphics_output_protocol_t;
 typedef struct efi_system_table efi_system_table_t;
 
 struct efi_simple_text_output_protocol {
@@ -122,6 +126,31 @@ struct efi_loaded_image_protocol {
 	void *unload;
 };
 
+typedef struct {
+	uint32_t version;
+	uint32_t horizontal_resolution;
+	uint32_t vertical_resolution;
+	uint32_t pixel_format;
+	uint32_t pixel_information[4];
+	uint32_t pixels_per_scan_line;
+} efi_graphics_output_mode_information_t;
+
+typedef struct {
+	uint32_t max_mode;
+	uint32_t mode;
+	efi_graphics_output_mode_information_t *info;
+	efi_uintn_t size_of_info;
+	efi_physical_address_t frame_buffer_base;
+	efi_uintn_t frame_buffer_size;
+} efi_graphics_output_protocol_mode_t;
+
+struct efi_graphics_output_protocol {
+	void *query_mode;
+	void *set_mode;
+	void *blt;
+	efi_graphics_output_protocol_mode_t *mode;
+};
+
 struct efi_boot_services {
 	efi_table_header_t hdr;
 	void *raise_tpl;
@@ -164,6 +193,15 @@ struct efi_boot_services {
 	void *get_next_monotonic_count;
 	void(EFIAPI *stall)(efi_uintn_t microseconds);
 	void *set_watchdog_timer;
+	void *connect_controller;
+	void *disconnect_controller;
+	void *open_protocol;
+	void *close_protocol;
+	void *open_protocol_information;
+	void *protocols_per_handle;
+	void *locate_handle_buffer;
+	efi_status(EFIAPI *locate_protocol)(
+		efi_guid_t *protocol, void *registration, void **interface);
 };
 
 struct efi_system_table {
@@ -212,4 +250,14 @@ static inline efi_guid_t efi_loaded_image_protocol_guid(void)
 	};
 }
 
+static inline efi_guid_t efi_graphics_output_protocol_guid(void)
+{
+	return (efi_guid_t){
+		.data1 = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID_A,
+		.data2 = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID_B,
+		.data3 = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID_C,
+		.data4 = {0x96, 0xfb, 0x7a, 0xde, 0xd0, 0x80, 0x51, 0x6a},
+	};
+}
+
 #endif

arch/x86/kernel/Makefile

@@ -3,6 +3,8 @@ ARCH_KERNEL_SRCS := \
 	$(ARCH_DIR)/kernel/gdt.c \
 	$(ARCH_DIR)/kernel/idt.c \
 	$(ARCH_DIR)/kernel/irq.c \
+	$(ARCH_DIR)/kernel/screen.c \
+	$(ARCH_DIR)/kernel/screen_font.c \
 	$(ARCH_DIR)/kernel/traps.c
 
 ARCH_KERNEL_OBJS := \

arch/x86/kernel/early_log.c

@@ -4,6 +4,8 @@
 
 #include <tianole/arch.h>
 
+#include "screen.h"
+
 #define X86_QEMU_DEBUG_PORT 0xe9
 
 #define X86_COM1_BASE 0x3f8
@@ -37,7 +39,7 @@ static void serial_putc(char ch)
 	outb(X86_COM1_BASE + X86_COM_DATA, (uint8_t)ch);
 }
 
-void arch_early_log_init(void)
+void arch_early_log_init(const boot_info_t *boot_info)
 {
 	outb(X86_COM1_BASE + X86_COM_INTERRUPT_ENABLE, 0x00);
 	outb(X86_COM1_BASE + X86_COM_LINE_CONTROL, X86_COM_LCR_DLAB);
@@ -46,12 +48,14 @@ void arch_early_log_init(void)
 	outb(X86_COM1_BASE + X86_COM_LINE_CONTROL, X86_COM_LCR_8N1);
 	outb(X86_COM1_BASE + X86_COM_FIFO_CONTROL, 0xc7);
 	outb(X86_COM1_BASE + X86_COM_MODEM_CONTROL, 0x0b);
+	screen_console_init(boot_info);
 }
 
 void arch_early_log_putc(char ch)
 {
 	debug_port_putc(ch);
 	serial_putc(ch);
+	screen_console_putc(ch);
 }
 
 void arch_halt_forever(void)

arch/x86/kernel/screen.c

@@ -0,0 +1,210 @@
+#include <stdint.h>
+
+#include <tianole/boot_info.h>
+
+#include "screen.h"
+#include "screen_font.h"
+
+#define GLYPH_SCALE 1u
+#define CELL_WIDTH 6u
+#define CELL_HEIGHT 9u
+
+#define PIXEL_FORMAT_RGB 0u
+#define PIXEL_FORMAT_BGR 1u
+
+#define ASCII_CR 13
+#define ASCII_LF 10
+
+static volatile uint32_t *framebuffer;
+static uint32_t screen_width;
+static uint32_t screen_height;
+static uint32_t pixels_per_scan_line;
+static uint32_t pixel_format;
+static uint32_t cursor_x;
+static uint32_t cursor_y;
+static uint32_t columns;
+static uint32_t rows;
+
+static uint32_t pixel_color(uint8_t red, uint8_t green, uint8_t blue)
+{
+	if (pixel_format == PIXEL_FORMAT_RGB) {
+		return red | ((uint32_t)green << 8) | ((uint32_t)blue << 16);
+	}
+
+	return blue | ((uint32_t)green << 8) | ((uint32_t)red << 16);
+}
+
+static void draw_pixel(uint32_t x, uint32_t y, uint32_t color)
+{
+	if (x >= screen_width || y >= screen_height) {
+		return;
+	}
+
+	framebuffer[y * pixels_per_scan_line + x] = color;
+}
+
+static void clear_cell(uint32_t column, uint32_t row)
+{
+	uint32_t x;
+	uint32_t y;
+	uint32_t start_x = column * CELL_WIDTH;
+	uint32_t start_y = row * CELL_HEIGHT;
+	uint32_t background = pixel_color(0, 0, 0);
+
+	for (y = 0; y < CELL_HEIGHT; y++) {
+		for (x = 0; x < CELL_WIDTH; x++) {
+			draw_pixel(start_x + x, start_y + y, background);
+		}
+	}
+}
+
+static void draw_char(char ch, uint32_t column, uint32_t row)
+{
+	const uint8_t *glyph = screen_font_glyph(ch);
+	uint32_t foreground = pixel_color(220, 220, 220);
+	uint32_t glyph_row;
+	uint32_t glyph_col;
+	uint32_t scale_x;
+	uint32_t scale_y;
+	uint32_t start_x = column * CELL_WIDTH;
+	uint32_t start_y = row * CELL_HEIGHT + 1;
+
+	clear_cell(column, row);
+
+	for (glyph_row = 0; glyph_row < SCREEN_FONT_HEIGHT; glyph_row++) {
+		for (glyph_col = 0; glyph_col < SCREEN_FONT_WIDTH;
+			glyph_col++) {
+			if ((glyph[glyph_row] &
+				    (1u << (SCREEN_FONT_WIDTH - 1 -
+					     glyph_col))) == 0) {
+				continue;
+			}
+
+			for (scale_y = 0; scale_y < GLYPH_SCALE; scale_y++) {
+				for (scale_x = 0; scale_x < GLYPH_SCALE;
+					scale_x++) {
+					draw_pixel(start_x +
+							glyph_col *
+								GLYPH_SCALE +
+							scale_x,
+						start_y +
+							glyph_row *
+								GLYPH_SCALE +
+							scale_y,
+						foreground);
+				}
+			}
+		}
+	}
+}
+
+static void clear_screen(void)
+{
+	uint32_t x;
+	uint32_t y;
+	uint32_t background = pixel_color(0, 0, 0);
+
+	for (y = 0; y < screen_height; y++) {
+		for (x = 0; x < screen_width; x++) {
+			draw_pixel(x, y, background);
+		}
+	}
+}
+
+static void clear_text_row(uint32_t row)
+{
+	uint32_t column;
+
+	for (column = 0; column < columns; column++) {
+		clear_cell(column, row);
+	}
+}
+
+static void scroll_up(void)
+{
+	uint32_t x;
+	uint32_t y;
+
+	for (y = CELL_HEIGHT; y < rows * CELL_HEIGHT; y++) {
+		for (x = 0; x < columns * CELL_WIDTH; x++) {
+			framebuffer[(y - CELL_HEIGHT) * pixels_per_scan_line +
+				x] = framebuffer[y * pixels_per_scan_line + x];
+		}
+	}
+
+	clear_text_row(rows - 1);
+}
+
+static void newline(void)
+{
+	cursor_x = 0;
+	if (cursor_y + 1 < rows) {
+		cursor_y++;
+		return;
+	}
+
+	scroll_up();
+	cursor_y = rows - 1;
+}
+
+/**
+ * screen_console_init() - Attach early logging to the GOP framebuffer.
+ * @boot_info: Boot handoff data captured before ExitBootServices().
+ *
+ * The console is intentionally minimal. It validates that the bootloader found
+ * a linear 32-bit RGB/BGR framebuffer, records the current mode, and clears the
+ * visible surface so subsequent early_log output is readable in the QEMU
+ * window.
+ */
+void screen_console_init(const boot_info_t *boot_info)
+{
+	if (boot_info == 0 || boot_info->framebuffer_base == 0 ||
+		boot_info->framebuffer_width == 0 ||
+		boot_info->framebuffer_height == 0 ||
+		boot_info->framebuffer_pixels_per_scan_line == 0 ||
+		boot_info->framebuffer_pixel_format > PIXEL_FORMAT_BGR) {
+		return;
+	}
+
+	framebuffer =
+		(volatile uint32_t *)(uintptr_t)boot_info->framebuffer_base;
+	screen_width = boot_info->framebuffer_width;
+	screen_height = boot_info->framebuffer_height;
+	pixels_per_scan_line = boot_info->framebuffer_pixels_per_scan_line;
+	pixel_format = boot_info->framebuffer_pixel_format;
+	columns = screen_width / CELL_WIDTH;
+	rows = screen_height / CELL_HEIGHT;
+	cursor_x = 0;
+	cursor_y = 0;
+	clear_screen();
+}
+
+/**
+ * screen_console_putc() - Mirror a log byte to the early framebuffer console.
+ * @ch: Byte emitted by early_log.
+ *
+ * Characters are drawn into fixed-size cells. Newlines advance the cursor; when
+ * the last row is exhausted the framebuffer text area scrolls up one row so
+ * real boot smoke tests keep useful context on screen.
+ */
+void screen_console_putc(char ch)
+{
+	if (framebuffer == 0 || rows == 0 || columns == 0) {
+		return;
+	}
+
+	if (ch == ASCII_CR) {
+		return;
+	}
+
+	if (ch == ASCII_LF) {
+		newline();
+		return;
+	}
+
+	draw_char(ch, cursor_x, cursor_y);
+	cursor_x++;
+	if (cursor_x >= columns) {
+		newline();
+	}
+}

arch/x86/kernel/screen.h

@@ -0,0 +1,18 @@
+#ifndef X86_KERNEL_SCREEN_H
+#define X86_KERNEL_SCREEN_H
+
+#include <tianole/boot_info.h>
+
+/**
+ * screen_console_init() - Bind early log output to a boot framebuffer.
+ * @boot_info: Boot handoff data with framebuffer mode information.
+ */
+void screen_console_init(const boot_info_t *boot_info);
+
+/**
+ * screen_console_putc() - Draw one early log byte on the boot framebuffer.
+ * @ch: Character emitted by early_log.
+ */
+void screen_console_putc(char ch);
+
+#endif

arch/x86/kernel/screen_font.c

@@ -0,0 +1,81 @@
+#include <stdint.h>
+
+#include "screen_font.h"
+
+struct glyph {
+	char ch;
+	uint8_t rows[SCREEN_FONT_HEIGHT];
+};
+
+static const struct glyph font[] = {
+	{' ', {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}},
+	{'!', {0x04, 0x04, 0x04, 0x04, 0x04, 0x00, 0x04}},
+	{'.', {0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x0c}},
+	{',', {0x00, 0x00, 0x00, 0x00, 0x0c, 0x04, 0x08}},
+	{':', {0x00, 0x0c, 0x0c, 0x00, 0x0c, 0x0c, 0x00}},
+	{'-', {0x00, 0x00, 0x00, 0x1f, 0x00, 0x00, 0x00}},
+	{'_', {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f}},
+	{'=', {0x00, 0x00, 0x1f, 0x00, 0x1f, 0x00, 0x00}},
+	{'/', {0x01, 0x02, 0x04, 0x04, 0x08, 0x10, 0x10}},
+	{'0', {0x0e, 0x11, 0x13, 0x15, 0x19, 0x11, 0x0e}},
+	{'1', {0x04, 0x0c, 0x04, 0x04, 0x04, 0x04, 0x0e}},
+	{'2', {0x0e, 0x11, 0x01, 0x02, 0x04, 0x08, 0x1f}},
+	{'3', {0x1e, 0x01, 0x01, 0x0e, 0x01, 0x01, 0x1e}},
+	{'4', {0x02, 0x06, 0x0a, 0x12, 0x1f, 0x02, 0x02}},
+	{'5', {0x1f, 0x10, 0x10, 0x1e, 0x01, 0x01, 0x1e}},
+	{'6', {0x0e, 0x10, 0x10, 0x1e, 0x11, 0x11, 0x0e}},
+	{'7', {0x1f, 0x01, 0x02, 0x04, 0x08, 0x08, 0x08}},
+	{'8', {0x0e, 0x11, 0x11, 0x0e, 0x11, 0x11, 0x0e}},
+	{'9', {0x0e, 0x11, 0x11, 0x0f, 0x01, 0x01, 0x0e}},
+	{'A', {0x0e, 0x11, 0x11, 0x1f, 0x11, 0x11, 0x11}},
+	{'B', {0x1e, 0x11, 0x11, 0x1e, 0x11, 0x11, 0x1e}},
+	{'C', {0x0e, 0x11, 0x10, 0x10, 0x10, 0x11, 0x0e}},
+	{'D', {0x1e, 0x11, 0x11, 0x11, 0x11, 0x11, 0x1e}},
+	{'E', {0x1f, 0x10, 0x10, 0x1e, 0x10, 0x10, 0x1f}},
+	{'F', {0x1f, 0x10, 0x10, 0x1e, 0x10, 0x10, 0x10}},
+	{'G', {0x0e, 0x11, 0x10, 0x17, 0x11, 0x11, 0x0f}},
+	{'H', {0x11, 0x11, 0x11, 0x1f, 0x11, 0x11, 0x11}},
+	{'I', {0x0e, 0x04, 0x04, 0x04, 0x04, 0x04, 0x0e}},
+	{'J', {0x07, 0x02, 0x02, 0x02, 0x12, 0x12, 0x0c}},
+	{'K', {0x11, 0x12, 0x14, 0x18, 0x14, 0x12, 0x11}},
+	{'L', {0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x1f}},
+	{'M', {0x11, 0x1b, 0x15, 0x15, 0x11, 0x11, 0x11}},
+	{'N', {0x11, 0x19, 0x15, 0x13, 0x11, 0x11, 0x11}},
+	{'O', {0x0e, 0x11, 0x11, 0x11, 0x11, 0x11, 0x0e}},
+	{'P', {0x1e, 0x11, 0x11, 0x1e, 0x10, 0x10, 0x10}},
+	{'Q', {0x0e, 0x11, 0x11, 0x11, 0x15, 0x12, 0x0d}},
+	{'R', {0x1e, 0x11, 0x11, 0x1e, 0x14, 0x12, 0x11}},
+	{'S', {0x0f, 0x10, 0x10, 0x0e, 0x01, 0x01, 0x1e}},
+	{'T', {0x1f, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04}},
+	{'U', {0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x0e}},
+	{'V', {0x11, 0x11, 0x11, 0x11, 0x0a, 0x0a, 0x04}},
+	{'W', {0x11, 0x11, 0x11, 0x15, 0x15, 0x1b, 0x11}},
+	{'X', {0x11, 0x11, 0x0a, 0x04, 0x0a, 0x11, 0x11}},
+	{'Y', {0x11, 0x11, 0x0a, 0x04, 0x04, 0x04, 0x04}},
+	{'Z', {0x1f, 0x01, 0x02, 0x04, 0x08, 0x10, 0x1f}},
+	{'?', {0x0e, 0x11, 0x01, 0x02, 0x04, 0x00, 0x04}},
+};
+
+/**
+ * screen_font_glyph() - Return a tiny bitmap glyph for early console text.
+ * @ch: ASCII character requested by the early framebuffer console.
+ *
+ * The boot console keeps the font deliberately small: lowercase letters are
+ * folded to uppercase, and unsupported characters fall back to question mark.
+ */
+const uint8_t *screen_font_glyph(char ch)
+{
+	uint32_t index;
+
+	if (ch >= 97 && ch <= 122) {
+		ch = (char)(ch - 97 + 65);
+	}
+
+	for (index = 0; index < sizeof(font) / sizeof(font[0]); index++) {
+		if (font[index].ch == ch) {
+			return font[index].rows;
+		}
+	}
+
+	return font[sizeof(font) / sizeof(font[0]) - 1].rows;
+}

arch/x86/kernel/screen_font.h

@@ -0,0 +1,11 @@
+#ifndef X86_KERNEL_SCREEN_FONT_H
+#define X86_KERNEL_SCREEN_FONT_H
+
+#include <stdint.h>
+
+#define SCREEN_FONT_WIDTH 5u
+#define SCREEN_FONT_HEIGHT 7u
+
+const uint8_t *screen_font_glyph(char ch);
+
+#endif

docs/agents/tasks/01-early-debug.md

@@ -79,6 +79,7 @@
 
 - kernel early log 已拆成通用前端和 x86 backend。
 - x86 backend 已同时写 QEMU debug port 和 COM1。
+- x86 backend 已可在 UEFI GOP framebuffer 上显示 early log，QEMU 图形窗口可直接观察启动日志。
 - `panic()` 已接入 early log 和 `arch_halt_forever()`。
 - `scripts/check.sh` 已验证 `build/debug.log` 和 `build/serial.log` 中的关键启动行。
 

docs/agents/tasks/04-time-scheduler.md

@@ -154,6 +154,7 @@
 - 已建立最小 DEAD 线程回收路径，调度前会释放非当前 DEAD 线程的内核栈和线程对象。
 - 已建立统一 `kernel_thread_exit()`/`sched_thread_exit()`，线程入口返回和显式退出都会进入明确退出路径，再由调度安全边界回收非当前 DEAD 线程。
 - 已在调度私有头中加入 thread state helper，调度核心、线程退出和 wait queue 路径不再直接散写主要状态转换。
+- 已提供 `wait_queue_lock_irqsave()` / `wait_queue_unlock_irqrestore()` 和 locked wakeup 接口，条件修改与 wakeup 可以收敛在同一 wait queue 锁边界内。
 - 已把调度代码按职责拆分为 `core.c`、`thread.c`、`wait.c`、`idle.c` 和私有 `sched.h`，并把当前阶段自测/演示线程移到 `kernel/selftest/sched.c`。
 - `scripts/check.sh` 已验证 `timer initialized`、`timer tick=1/2/3`、`scheduler initialized`、`kernel thread selftest ok`、timer 驱动线程轮转、`sched_sleep()`、wait queue wakeup、条件等待、超时等待、线程返回退出、显式退出和 DEAD 线程回收。
 
@@ -167,8 +168,8 @@
 
 ### B. wait queue 锁语义
 
-- 为 wait queue 增加内部锁或要求调用方持有指定锁，并在接口命名中体现约束。
-- 继续把条件所属数据的修改规则文档化；当前 wait queue 内部锁已经覆盖条件检查、等待入队和 wakeup 队列修改。
+- 已为 wait queue 增加内部锁，并提供显式 locked wakeup 接口；后续继续扩大调用方按条件锁规则更新条件的覆盖面。
+- 继续把条件所属数据的修改规则文档化；当前 wait queue 内部锁已经覆盖条件检查、等待入队、wakeup 队列修改，以及 demo 中的条件修改 + wakeup。
 - 区分 `wake_one`、`wake_all`、timeout wakeup 和条件 wakeup 的状态处理。
 - 检查 wakeup 是否可能唤醒 DEAD、RUNNING 或未入队线程。
 

include/tianole/arch.h

@@ -3,12 +3,15 @@
 
 #include <stdint.h>
 
+#include <tianole/boot_info.h>
+
 /**
  * arch_early_log_init() - Initialize architecture early log devices.
+ * @boot_info: Bootloader handoff data, or NULL for backend-only setup.
  *
  * Provides the backend setup used by the generic early log front end.
  */
-void arch_early_log_init(void);
+void arch_early_log_init(const boot_info_t *boot_info);
 
 /**
  * arch_early_log_putc() - Emit one character through arch early log devices.

include/tianole/boot_info.h

@@ -42,6 +42,12 @@ typedef struct {
  * @memory_descriptor_size: Size of each memory descriptor entry.
  * @memory_descriptor_version: Firmware descriptor version.
  * @reserved0: Reserved field for alignment and future expansion.
+ * @framebuffer_base: Physical base address of the boot framebuffer.
+ * @framebuffer_size: Framebuffer size in bytes.
+ * @framebuffer_width: Visible framebuffer width in pixels.
+ * @framebuffer_height: Visible framebuffer height in pixels.
+ * @framebuffer_pixels_per_scan_line: Physical pixels per scan line.
+ * @framebuffer_pixel_format: Bootloader-provided pixel format identifier.
  *
  * Boot-time handoff data owned by Tianole rather than by a specific firmware
  * or architecture API. Fields can grow while the kernel entry stays stable.
@@ -55,12 +61,18 @@ typedef struct {
 	uint64_t memory_descriptor_size;
 	uint32_t memory_descriptor_version;
 	uint32_t reserved0;
+	uint64_t framebuffer_base;
+	uint64_t framebuffer_size;
+	uint32_t framebuffer_width;
+	uint32_t framebuffer_height;
+	uint32_t framebuffer_pixels_per_scan_line;
+	uint32_t framebuffer_pixel_format;
 } boot_info_t;
 
 /**
  * BOOT_INFO_VERSION - Current boot_info_t layout version.
  */
-#define BOOT_INFO_VERSION 1u
+#define BOOT_INFO_VERSION 2u
 
 /**
  * BOOT_FLAG_SERVICES_ACTIVE - Firmware boot services were active at handoff.

include/tianole/early_log.h

@@ -3,13 +3,16 @@
 
 #include <stdint.h>
 
+#include <tianole/boot_info.h>
+
 /**
  * early_log_init() - Initialize early logging backends.
+ * @boot_info: Bootloader handoff data used by optional display backends.
  *
  * Sets up the architecture-provided early output path. This must be usable
  * before heap, scheduler, VFS or normal drivers exist.
  */
-void early_log_init(void);
+void early_log_init(const boot_info_t *boot_info);
 
 /**
  * early_log_putc() - Write one character to every early log backend.

include/tianole/sched.h

@@ -45,8 +45,9 @@ enum thread_state {
  * @head: Oldest waiting thread.
  * @tail: Newest waiting thread.
  *
- * The queue owns only wait links. The condition being waited on may be owned
- * by another subsystem and must have a documented synchronization rule.
+ * The queue owns only wait links. A condition protected by this queue must be
+ * updated under wait_queue_lock_irqsave(), followed by a locked wakeup before
+ * releasing the lock; otherwise the caller must document its own lock rule.
  */
 struct wait_queue {
 	struct spinlock lock;
@@ -163,6 +164,40 @@ void sched_sleep(uint64_t ticks);
  */
 void wait_queue_init(struct wait_queue *queue);
 
+/**
+ * wait_queue_lock_irqsave() - Lock a wait queue and save interrupt state.
+ * @queue: Wait queue whose condition or waiter links will be updated.
+ * @flags: Storage for the previous interrupt state.
+ *
+ * Callers may use this lock to protect the condition paired with
+ * wait_queue_wait(). In that model, update the condition and call a locked
+ * wakeup helper before unlocking to avoid lost wakeups.
+ */
+void wait_queue_lock_irqsave(struct wait_queue *queue, uint64_t *flags);
+
+/**
+ * wait_queue_unlock_irqrestore() - Unlock a wait queue and restore interrupts.
+ * @queue: Wait queue previously locked by wait_queue_lock_irqsave().
+ * @flags: Interrupt state returned by wait_queue_lock_irqsave().
+ */
+void wait_queue_unlock_irqrestore(struct wait_queue *queue, uint64_t flags);
+
+/**
+ * wait_queue_wake_one_locked() - Wake one waiter while holding queue lock.
+ * @queue: Locked wait queue containing waiting threads.
+ *
+ * Use when the wakeup condition is modified under the wait queue lock.
+ */
+void wait_queue_wake_one_locked(struct wait_queue *queue);
+
+/**
+ * wait_queue_wake_all_locked() - Wake all waiters while holding queue lock.
+ * @queue: Locked wait queue containing waiting threads.
+ *
+ * Use when the wakeup condition is modified under the wait queue lock.
+ */
+void wait_queue_wake_all_locked(struct wait_queue *queue);
+
 /**
  * wait_queue_sleep() - Sleep until another thread wakes the queue.
  * @queue: Queue to sleep on.
@@ -177,6 +212,10 @@ void wait_queue_sleep(struct wait_queue *queue);
  * @condition: Predicate checked before and after sleeping.
  * @arg: Opaque predicate argument.
  *
+ * The predicate is evaluated while the queue lock is held. If the waited-on
+ * condition uses this queue for synchronization, writers must hold the same
+ * lock, update the condition, and then call wait_queue_wake_*_locked().
+ *
  * Return: 0 when the condition is true, -EINVAL on invalid input.
  */
 int wait_queue_wait(
@@ -189,6 +228,9 @@ int wait_queue_wait(
  * @arg: Opaque predicate argument.
  * @ticks: Maximum number of timer ticks to wait.
  *
+ * The predicate is evaluated while the queue lock is held. The same condition
+ * locking rule as wait_queue_wait() applies.
+ *
  * Return: 0 when the condition is true, -EINVAL or -ETIMEDOUT otherwise.
  */
 int wait_queue_wait_timeout(struct wait_queue *queue,

kernel/early_log.c

@@ -5,20 +5,20 @@
 
 static int early_log_ready;
 
-void early_log_init(void)
+void early_log_init(const boot_info_t *boot_info)
 {
 	if (early_log_ready != 0) {
 		return;
 	}
 
-	arch_early_log_init();
+	arch_early_log_init(boot_info);
 	early_log_ready = 1;
 }
 
 void early_log_putc(char ch)
 {
 	if (early_log_ready == 0) {
-		early_log_init();
+		early_log_init(0);
 	}
 
 	arch_early_log_putc(ch);

kernel/main.c

@@ -8,7 +8,7 @@
 
 void kernel_main(const boot_info_t *boot_info)
 {
-	early_log_init();
+	early_log_init(boot_info);
 	early_log_puts("kernel_main entered\n");
 	arch_traps_init();
 	kernel_report_boot_state(boot_info);

kernel/sched/wait.c

@@ -91,8 +91,58 @@ static int wait_queue_remove_locked(
 
 static void wait_queue_mark_ready_locked(struct thread *thread)
 {
-	if (thread_is_waiting(thread) || thread_is_sleeping(thread)) {
+	if (thread == 0) {
+		return;
+	}
+
+	if (!thread_is_waiting(thread) && !thread_is_sleeping(thread)) {
+		panic("wait queue wakeup found non-waiting thread");
+	}
+
 	thread_set_ready(thread);
+}
+
+void wait_queue_lock_irqsave(struct wait_queue *queue, uint64_t *flags)
+{
+	if (queue == 0 || flags == 0) {
+		return;
+	}
+
+	spin_lock_irqsave(&queue->lock, flags);
+}
+
+void wait_queue_unlock_irqrestore(struct wait_queue *queue, uint64_t flags)
+{
+	if (queue == 0) {
+		return;
+	}
+
+	spin_unlock_irqrestore(&queue->lock, flags);
+}
+
+void wait_queue_wake_one_locked(struct wait_queue *queue)
+{
+	struct thread *thread;
+
+	if (queue == 0) {
+		return;
+	}
+
+	thread = wait_queue_remove_head_locked(queue);
+	wait_queue_mark_ready_locked(thread);
+}
+
+void wait_queue_wake_all_locked(struct wait_queue *queue)
+{
+	struct thread *thread;
+
+	if (queue == 0) {
+		return;
+	}
+
+	while (queue->head != 0) {
+		thread = wait_queue_remove_head_locked(queue);
+		wait_queue_mark_ready_locked(thread);
 	}
 }
 
@@ -200,7 +250,6 @@ int wait_queue_wait_timeout(struct wait_queue *queue,
 
 void wait_queue_wake_one(struct wait_queue *queue)
 {
-	struct thread *thread;
 	uint64_t flags;
 
 	if (queue == 0) {
@@ -208,14 +257,12 @@ void wait_queue_wake_one(struct wait_queue *queue)
 	}
 
 	spin_lock_irqsave(&queue->lock, &flags);
-	thread = wait_queue_remove_head_locked(queue);
-	wait_queue_mark_ready_locked(thread);
+	wait_queue_wake_one_locked(queue);
 	spin_unlock_irqrestore(&queue->lock, flags);
 }
 
 void wait_queue_wake_all(struct wait_queue *queue)
 {
-	struct thread *thread;
 	uint64_t flags;
 
 	if (queue == 0) {
@@ -223,9 +270,6 @@ void wait_queue_wake_all(struct wait_queue *queue)
 	}
 
 	spin_lock_irqsave(&queue->lock, &flags);
-	while (queue->head != 0) {
-		thread = wait_queue_remove_head_locked(queue);
-		wait_queue_mark_ready_locked(thread);
-	}
+	wait_queue_wake_all_locked(queue);
 	spin_unlock_irqrestore(&queue->lock, flags);
 }

kernel/selftest/sched.c

@@ -162,13 +162,17 @@ static void condition_wait_demo_waiter(void *arg)
 
 static void condition_wait_demo_waker(void *arg)
 {
+	uint64_t flags;
+
 	(void)arg;
 
 	early_log_puts("condition waker sleeping\n");
 	sched_sleep(5);
+	wait_queue_lock_irqsave(&condition_wait_queue, &flags);
 	condition_ready = 1;
 	early_log_puts("condition waker wake_all\n");
-	wait_queue_wake_all(&condition_wait_queue);
+	wait_queue_wake_all_locked(&condition_wait_queue);
+	wait_queue_unlock_irqrestore(&condition_wait_queue, flags);
 }
 
 static void timeout_wait_demo_waiter(void *arg)
@@ -209,23 +213,36 @@ static void explicit_exit_demo_thread(void *arg)
 
 void sched_demo_start(void)
 {
-	struct thread *first = kernel_thread_create(
+	struct thread *first;
+	struct thread *second;
+	struct thread *waiter;
+	struct thread *waker;
+	struct thread *condition_waiter;
+	struct thread *condition_waker;
+	struct thread *timeout_waiter;
+	struct thread *return_exit;
+	struct thread *explicit_exit;
+
+	wait_queue_init(&demo_wait_queue);
+	wait_queue_init(&condition_wait_queue);
+	wait_queue_init(&timeout_wait_queue);
+	condition_ready = 0;
+
+	first = kernel_thread_create(
 		"round-robin-a", scheduler_demo_entry, (void *)(uintptr_t)1);
-	struct thread *second = kernel_thread_create(
+	second = kernel_thread_create(
 		"round-robin-b", scheduler_demo_entry, (void *)(uintptr_t)2);
-	struct thread *waiter =
-		kernel_thread_create("waiter", wait_queue_demo_waiter, 0);
-	struct thread *waker =
-		kernel_thread_create("waker", wait_queue_demo_waker, 0);
-	struct thread *condition_waiter = kernel_thread_create(
+	waiter = kernel_thread_create("waiter", wait_queue_demo_waiter, 0);
+	waker = kernel_thread_create("waker", wait_queue_demo_waker, 0);
+	condition_waiter = kernel_thread_create(
 		"condition-waiter", condition_wait_demo_waiter, 0);
-	struct thread *condition_waker = kernel_thread_create(
+	condition_waker = kernel_thread_create(
 		"condition-waker", condition_wait_demo_waker, 0);
-	struct thread *timeout_waiter = kernel_thread_create(
+	timeout_waiter = kernel_thread_create(
 		"timeout-waiter", timeout_wait_demo_waiter, 0);
-	struct thread *return_exit =
+	return_exit =
 		kernel_thread_create("return-exit", return_exit_demo_thread, 0);
-	struct thread *explicit_exit = kernel_thread_create(
+	explicit_exit = kernel_thread_create(
 		"explicit-exit", explicit_exit_demo_thread, 0);
 
 	if (first == 0 || second == 0 || waiter == 0 || waker == 0 ||
@@ -234,10 +251,6 @@ void sched_demo_start(void)
 		panic("scheduler demo thread creation failed");
 	}
 
-	wait_queue_init(&demo_wait_queue);
-	wait_queue_init(&condition_wait_queue);
-	wait_queue_init(&timeout_wait_queue);
-	condition_ready = 0;
 	early_log_puts("scheduler starting\n");
 	sched_yield();