E-R-Butch · E-R-Butch · Jul 13, 2026 · Jul 13, 2026
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,2 @@
+/out/
+.DS_Store
diff --git a/README.md b/README.md
@@ -1,2 +1,40 @@
-# 3917JR_kernel
-3917JR_GPL_SOURCECODE
+# Yulong / Coolpad 3917JR kernel
+
+这是 Rakuten BIG s（Yulong / Coolpad 3917JR，设备代号 `gaea`）Linux 4.19.81 内核源码的社区归档与可编译重建分支。
+
+原始 Yulong GPL 仓库缺少 `coolpad/`，并把 `techpack/camera`、`techpack/display`、`techpack/video` 留成了无法解析的 gitlink。本分支用同代公开 SM7250 4.19 源码恢复这些构建依赖，保留来源和补丁记录，并加入 DroidSpaces 所需的 namespace、cgroup 与网络配置。
+
+## 当前状态
+
+- 已恢复 camera / display / video techpack 的公开源码。
+- 已补齐恢复显示子树所需的公开 DRM 接口。
+- 已加入最小 `coolpad/` 构建骨架；缺失的私有 OEM 驱动不会伪装成原厂源码。
+- 已保存从实机 `boot_a` 提取的内核配置，以及重建和 DroidSpaces 配置片段。
+- 已启用 PID、UTS、IPC namespace、System V IPC、device cgroup、devtmpfs、veth 等 DroidSpaces 依赖。
+- 已用 Android Clang `r365631c` 和 AArch64 GNU ld 完整编译出 ARM64 `Image`；哈希和配置核验见 [构建验证记录](reconstruction/BUILD_VERIFICATION.md)。
+- 当前产物仍未在真机启动验证，请先阅读 [重建说明](reconstruction/README.zh-CN.md)。
+
+## 构建
+
+建议使用 Yulong 构建配置对应的 Android Clang `r365631c`，并安装 AArch64 GNU binutils（构建脚本调用 `aarch64-linux-gnu-ld`；旧版 `ld.lld` 链接此树时会发生尺寸溢出）：
+
+```bash
+export TOOLCHAIN=/path/to/clang-r365631c
+./reconstruction/scripts/build.sh
+```
+
+默认输出目录是 `out/gaea-reconstructed`。脚本会从实机配置开始，应用重建与 DroidSpaces 配置片段，验证关键选项，再构建 arm64 `Image`。
+
+请在 Linux 或区分大小写的文件系统中 checkout 和构建。内核树包含 Linux 正常但 macOS / Windows 默认文件系统会冲突的大小写文件名；macOS 上建议使用区分大小写的 APFS 卷或 Linux 容器卷。
+
+## 重要限制
+
+这不是泄露的 Yulong 私有源码，也不是已经证明可刷入的成品内核。Pixelworks Iris3、部分指纹 / NFC / OEMInfo / 电源复位等厂商驱动没有可验证的同版本公开来源，安全基线中保持关闭。不要在没有原始分区备份和可用恢复路径的情况下刷写。
+
+详细来源、恢复方法与已知缺口见：
+
+- [重建与验证说明](reconstruction/README.zh-CN.md)
+- [构建验证记录](reconstruction/BUILD_VERIFICATION.md)
+- [源码来源与许可](reconstruction/SOURCES.md)
+- [配置片段](reconstruction/configs)
+- [恢复补丁记录](reconstruction/patches)
diff --git a/msm-4.19/coolpad/arch/product_list/Kconfig b/msm-4.19/coolpad/arch/product_list/Kconfig
@@ -0,0 +1,11 @@
+menu "Yulong product compatibility"
+
+config YULONG_PRODUCT
+	bool "Yulong product support"
+	default y
+
+config BOARD_GAEA
+	bool "Yulong gaea (3917JR)"
+	default y
+
+endmenu
diff --git a/msm-4.19/coolpad/drivers/Makefile b/msm-4.19/coolpad/drivers/Makefile
@@ -0,0 +1 @@
+# Minimal compatibility layer for the vendor tree omitted from the GPL archive.
diff --git a/msm-4.19/coolpad/drivers/input/fingerprint/Kconfig b/msm-4.19/coolpad/drivers/input/fingerprint/Kconfig
@@ -0,0 +1,8 @@
+config INPUT_FINGERPRINT
+	bool "Yulong fingerprint compatibility"
+	default n
+
+config GOODIX_GW9558_FINGERPRINT
+	bool "Goodix GW9558 fingerprint compatibility"
+	depends on INPUT_FINGERPRINT
+	default n
diff --git a/msm-4.19/coolpad/drivers/input/misc/Kconfig b/msm-4.19/coolpad/drivers/input/misc/Kconfig
@@ -0,0 +1,3 @@
+config YL_PMIC_INPUT_LOGGING
+	bool "Yulong PMIC input logging compatibility"
+	default n
diff --git a/msm-4.19/coolpad/drivers/input/touchscreen/Kconfig b/msm-4.19/coolpad/drivers/input/touchscreen/Kconfig
@@ -0,0 +1,7 @@
+config YL_TOUCHSCREEN_HAL
+	bool "Yulong touchscreen HAL compatibility"
+	default n
+
+config YL_TOUCHSCREEN_FT3518
+	bool "Yulong FT3518 compatibility"
+	default n
diff --git a/msm-4.19/coolpad/drivers/misc/Kconfig b/msm-4.19/coolpad/drivers/misc/Kconfig
@@ -0,0 +1,30 @@
+config BOOTREASON
+	bool "Yulong boot reason compatibility"
+	default n
+
+config YL_PSTORE_SSR_REASON
+	bool "Yulong SSR reason compatibility"
+	default n
+
+config YL_RESERVED_RAM
+	bool "Yulong reserved RAM compatibility"
+	default n
+
+config YL_RESERVED_RAM_BASE
+	hex "Yulong reserved RAM base"
+	depends on YL_RESERVED_RAM
+	default 0x9b800000
+
+config OEMINFO
+	bool "Yulong OEM info compatibility"
+	default n
+
+config OEMINFO_DEV_BLK_PATH
+	string "Yulong OEM info block path"
+	depends on OEMINFO
+	default "/dev/block/by-name/params"
+
+config OEMINFO_DEV_BLK_SIZE
+	int "Yulong OEM info block size"
+	depends on OEMINFO
+	default 4096
diff --git a/msm-4.19/coolpad/drivers/nfc/Kconfig b/msm-4.19/coolpad/drivers/nfc/Kconfig
@@ -0,0 +1,11 @@
+config YL_NFC_NXP_SN100F
+	bool "Yulong NXP SN100F compatibility"
+	default n
+
+config YL_NFC_PN553_DEVICES
+	bool "Yulong PN553 compatibility"
+	default n
+
+config YL_NFC_PN54X_DEVICES
+	bool "Yulong PN54x compatibility"
+	default n
diff --git a/msm-4.19/coolpad/drivers/pixelworks/Kconfig b/msm-4.19/coolpad/drivers/pixelworks/Kconfig
@@ -0,0 +1,8 @@
+config PXLW_IRIS3
+	bool "Pixelworks Iris3 compatibility"
+	default n
+
+config PXLW_IRIS3_PLATFORM_7250
+	bool "Pixelworks Iris3 SM7250 compatibility"
+	depends on PXLW_IRIS3
+	default n
diff --git a/msm-4.19/coolpad/drivers/power/Kconfig b/msm-4.19/coolpad/drivers/power/Kconfig
@@ -0,0 +1,11 @@
+config YL_POWER_RESET
+	bool "Yulong power reset compatibility"
+	default n
+
+config YL_REBOOT_STRESS_TEST
+	bool "Yulong reboot stress compatibility"
+	default n
+
+config YL_DLOAD_MODE
+	bool "Yulong download mode compatibility"
+	default n
diff --git a/msm-4.19/coolpad/fs/Makefile b/msm-4.19/coolpad/fs/Makefile
@@ -0,0 +1 @@
+# The Yulong filesystem extension tree was not included in the GPL archive.
diff --git a/msm-4.19/coolpad/sound/Makefile b/msm-4.19/coolpad/sound/Makefile
@@ -0,0 +1 @@
+# The Yulong sound extension tree was not included in the GPL archive.
diff --git a/msm-4.19/coolpad/sound/soc/Kconfig b/msm-4.19/coolpad/sound/soc/Kconfig
@@ -0,0 +1,3 @@
+config SND_SOC_PA_CAL
+	bool "Yulong speaker amplifier calibration compatibility"
+	default n
diff --git a/msm-4.19/drivers/gpu/drm/Makefile b/msm-4.19/drivers/gpu/drm/Makefile
@@ -18,7 +18,8 @@ drm-y       :=	drm_auth.o drm_bufs.o drm_cache.o \
 		drm_encoder.o drm_mode_object.o drm_property.o \
 		drm_plane.o drm_color_mgmt.o drm_print.o \
 		drm_dumb_buffers.o drm_mode_config.o drm_vblank.o \
-		drm_syncobj.o drm_lease.o drm_writeback.o drm_client.o
+		drm_syncobj.o drm_lease.o drm_writeback.o drm_client.o \
+		drm_notifier_mi.o
 
 drm-$(CONFIG_DRM_LIB_RANDOM) += lib/drm_random.o
 drm-$(CONFIG_DRM_VM) += drm_vm.o

diff --git a/msm-4.19/drivers/gpu/drm/drm_mipi_dsi.c b/msm-4.19/drivers/gpu/drm/drm_mipi_dsi.c
@@ -2,6 +2,7 @@
  * MIPI DSI Bus
  *
  * Copyright (C) 2012-2013, Samsung Electronics, Co., Ltd.
+ * Copyright (C) 2020 XiaoMi, Inc.
  * Andrzej Hajda <a.hajda@samsung.com>
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
@@ -1070,6 +1071,29 @@ int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
 }
 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness);
 
+/**
+ * mipi_dsi_dcs_set_display_brightness_big_endian() - sets the brightness value of the
+ * display with big endian, high byte to 1st parameter, low byte to 2nd parameter
+ * @dsi: DSI peripheral device
+ * @brightness: brightness value
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int mipi_dsi_dcs_set_display_brightness_big_endian(struct mipi_dsi_device *dsi,
+					u16 brightness)
+{
+	u8 payload[2] = { brightness >> 8, brightness & 0xff};
+	ssize_t err;
+
+	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
+				 payload, sizeof(payload));
+	if (err < 0)
+		return err;
+
+	return 0;
+}
+EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness_big_endian);
+
 /**
  * mipi_dsi_dcs_get_display_brightness() - gets the current brightness value
  *    of the display

diff --git a/msm-4.19/drivers/gpu/drm/drm_notifier_mi.c b/msm-4.19/drivers/gpu/drm/drm_notifier_mi.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2019, The Linux Foundation. All rights reserved.
+ * Copyright (C) 2020 XiaoMi, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/notifier.h>
+
+static BLOCKING_NOTIFIER_HEAD(mi_drm_notifier_list);
+
+/**
+ * mi_drm_register_client - register a client notifier
+ * @nb: notifier block to callback on events
+ *
+ * This function registers a notifier callback function
+ * to msm_drm_notifier_list, which would be called when
+ * received unblank/power down event.
+ */
+int mi_drm_register_client(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_register(&mi_drm_notifier_list, nb);
+}
+EXPORT_SYMBOL(mi_drm_register_client);
+
+/**
+ * mi_drm_unregister_client - unregister a client notifier
+ * @nb: notifier block to callback on events
+ *
+ * This function unregisters the callback function from
+ * msm_drm_notifier_list.
+ */
+int mi_drm_unregister_client(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_unregister(&mi_drm_notifier_list, nb);
+}
+EXPORT_SYMBOL(mi_drm_unregister_client);
+
+/**
+ * mi_drm_notifier_call_chain - notify clients of drm_events
+ * @val: event MSM_DRM_EARLY_EVENT_BLANK or MSM_DRM_EVENT_BLANK
+ * @v: notifier data, inculde display id and display blank
+ *     event(unblank or power down).
+ */
+int mi_drm_notifier_call_chain(unsigned long val, void *v)
+{
+	return blocking_notifier_call_chain(&mi_drm_notifier_list, val, v);
+}
+EXPORT_SYMBOL(mi_drm_notifier_call_chain);
diff --git a/msm-4.19/drivers/platform/msm/gsi/gsi.c b/msm-4.19/drivers/platform/msm/gsi/gsi.c
@@ -2649,7 +2649,7 @@ static void __gsi_read_channel_scratch(unsigned long chan_hdl,
 			gsi_ctx->per.ee));
 }
 
-static union __packed gsi_channel_scratch __gsi_update_mhi_channel_scratch(
+static union gsi_channel_scratch __gsi_update_mhi_channel_scratch(
 	unsigned long chan_hdl, struct __packed gsi_mhi_channel_scratch mscr)
 {
 	union __packed gsi_channel_scratch scr;

diff --git a/msm-4.19/include/drm/drm_bridge.h b/msm-4.19/include/drm/drm_bridge.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2016 Intel Corporation
+ * Copyright (C) 2020 XiaoMi, Inc.
  *
  * Permission to use, copy, modify, distribute, and sell this software and its
  * documentation for any purpose is hereby granted without fee, provided that
@@ -294,6 +295,8 @@ struct drm_bridge {
 	const struct drm_bridge_funcs *funcs;
 	/** @driver_private: pointer to the bridge driver's internal context */
 	void *driver_private;
+	struct mutex lock;
+	bool is_dsi_drm_bridge;
 };
 
 void drm_bridge_add(struct drm_bridge *bridge);

diff --git a/msm-4.19/include/drm/drm_mipi_dsi.h b/msm-4.19/include/drm/drm_mipi_dsi.h
@@ -2,6 +2,7 @@
  * MIPI DSI Bus
  *
  * Copyright (C) 2012-2013, Samsung Electronics, Co., Ltd.
+ * Copyright (C) 2020 XiaoMi, Inc.
  * Andrzej Hajda <a.hajda@samsung.com>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -284,6 +285,8 @@ int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format);
 int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline);
 int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
 					u16 brightness);
+int mipi_dsi_dcs_set_display_brightness_big_endian(struct mipi_dsi_device *dsi,
+					u16 brightness);
 int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
 					u16 *brightness);
 

diff --git a/msm-4.19/include/drm/drm_notifier_mi.h b/msm-4.19/include/drm/drm_notifier_mi.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2019, The Linux Foundation. All rights reserved.
+ * Copyright (C) 2020 XiaoMi, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef _DRM_NOTIFIER_MI_H_
+#define _DRM_NOTIFIER_MI_H_
+
+#include <linux/notifier.h>
+//#include <linux/msm_drm_notify.h>
+
+enum {
+	/* panel: power on */
+	MSM_DRM_BLANK_UNBLANK,
+	/* panel: power off */
+	MSM_DRM_BLANK_POWERDOWN,
+};
+
+enum msm_drm_display_id {
+	/* primary display */
+	MSM_DRM_PRIMARY_DISPLAY,
+	/* external display */
+	MSM_DRM_EXTERNAL_DISPLAY,
+	MSM_DRM_DISPLAY_MAX
+};
+
+/* A hardware display blank change occurred */
+#define MI_DRM_EVENT_BLANK			0x01
+/* A hardware display blank early change occurred */
+#define MI_DRM_EARLY_EVENT_BLANK		0x02
+
+enum {
+	MI_DRM_BLANK_UNBLANK = 0,
+	MI_DRM_BLANK_LP1,
+	MI_DRM_BLANK_LP2,
+	MI_DRM_BLANK_STANDBY,
+	MI_DRM_BLANK_SUSPEND,
+	MI_DRM_BLANK_POWERDOWN,
+};
+
+struct mi_drm_notifier {
+	enum msm_drm_display_id id;
+	void *data;
+};
+
+int mi_drm_register_client(struct notifier_block *nb);
+int mi_drm_unregister_client(struct notifier_block *nb);
+int mi_drm_notifier_call_chain(unsigned long val, void *v);
+
+#endif /*_DRM_NOTIFIER_MI_H*/
diff --git a/msm-4.19/include/uapi/drm/msm_drm.h b/msm-4.19/include/uapi/drm/msm_drm.h
@@ -441,6 +441,7 @@ struct drm_msm_power_ctrl {
 #define DRM_EVENT_LTM_HIST 0X80000008
 #define DRM_EVENT_LTM_WB_PB 0X80000009
 #define DRM_EVENT_LTM_OFF 0X8000000A
+#define DRM_EVENT_TOUCH 0X8000000B
 
 #define DRM_IOCTL_MSM_GET_PARAM        DRM_IOWR(DRM_COMMAND_BASE + DRM_MSM_GET_PARAM, struct drm_msm_param)
 #define DRM_IOCTL_MSM_GEM_NEW          DRM_IOWR(DRM_COMMAND_BASE + DRM_MSM_GEM_NEW, struct drm_msm_gem_new)

diff --git a/msm-4.19/kernel/cgroup/cgroup.c b/msm-4.19/kernel/cgroup/cgroup.c
@@ -3684,6 +3684,11 @@ static int cgroup_add_file(struct cgroup_subsys_state *css, struct cgroup *cgrp,
 		spin_unlock_irq(&cgroup_file_kn_lock);
 	}
 
+	if (cft->ss && (cgrp->root->flags & CGRP_ROOT_NOPREFIX) && !(cft->flags & CFTYPE_NO_PREFIX)) {
+				snprintf(name, CGROUP_FILE_NAME_MAX, "%s.%s", cft->ss->name, cft->name);
+				kernfs_create_link(cgrp->kn, name, kn);
+	}
+
 	return 0;
 }
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		# Minimal compatibility layer for the vendor tree omitted from the GPL archive.
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		# The Yulong filesystem extension tree was not included in the GPL archive.
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		# The Yulong sound extension tree was not included in the GPL archive.