sept: Add support for loading sept from fss0

If `fss0=` key is detected, sept will be loaded from fusee-secondary.bin instead of `sept/sept_*`.

This will negate missing sept and failed to decrypt pkg2 errors, when booting HOS, for users that forget to update sept folder.

README.md

@@ -30,6 +30,7 @@ Custom Nintendo Switch bootloader, firmware patcher, and more.
 | bootloader/screenshots/  | Folder where Nyx screenshots are saved                                |
 | bootloader/payloads/     | For payloads. 'Payloads...' menu. Autoboot only supported by including them into an ini. All CFW bootloaders, tools, Linux payloads are supported. |
 | bootloader/libtools/     | Future reserved                                                       |
+| sept                     | Sept folder. This must be always get updated via the Atmosphère release zip. Needed for tools and booting HOS on 7.0.0 and up. Unused for booting HOS if `fss0=` key is defined. |
 
 **Note**: Sept files for booting 7.0.0 and up are expected at /sept folder at root of sd card.
 
@@ -68,7 +69,7 @@ You can find a template [Here](./res/hekate_ipl_template.ini)
 | kernel={SD path}       | Replaces the kernel binary                                 |
 | kip1={SD path}         | Replaces/Adds kernel initial process. Multiple can be set. |
 | kip1={SD folder}/*     | Loads every .kip/.kip1 inside a folder. Compatible with single kip1 keys. |
-| fss0={SD path}         | Takes a fusee-secondary binary and `extracts` all needed parts from it. |
+| fss0={SD path}         | Takes a fusee-secondary binary and `extracts` all needed parts from it. kips, exosphere, warmboot and sept. |
 | kip1patch=patchname    | Enables a kip1 patch. Specify with multiple lines and/or as CSV. If not found, an error will show up |
 | fullsvcperm=1          | Disables SVC verification (full services permission)       |
 | debugmode=1            | Enables Debug mode. Obsolete when used with exosphere as secmon. |

bootloader/frontend/fe_tools.c

@@ -109,7 +109,7 @@ void dump_packages12()
 			gfx_printf("sept will run to get the keys.\nThen rerun this option.");
 			btn_wait();
 
-			if (!reboot_to_sept((u8 *)tsec_ctxt.fw, kb))
+			if (!reboot_to_sept((u8 *)tsec_ctxt.fw, kb, NULL))
 			{
 				gfx_printf("Failed to run sept\n");
 				goto out_free;

bootloader/hos/fss.c

@@ -90,11 +90,12 @@ static void _update_r2p(const char *path)
 	free(r2p_path);
 }
 
-int parse_fss(launch_ctxt_t *ctxt, const char *path)
+int parse_fss(launch_ctxt_t *ctxt, const char *path, fss0_sept_t *sept_ctxt)
 {
 	FIL fp;
 
 	bool stock = false;
+	int sept_used = 0;
 
 	LIST_FOREACH_ENTRY(ini_kv_t, kv, &ctxt->cfg->kvs, link)
 	{
@@ -103,12 +104,13 @@ int parse_fss(launch_ctxt_t *ctxt, const char *path)
 				stock = true;
 	}
 
-	if (stock && ctxt->pkg1_id->kb <= KB_FIRMWARE_VERSION_620 && (!emu_cfg.enabled || h_cfg.emummc_force_disable))
+	if (!sept_ctxt && stock && ctxt->pkg1_id->kb <= KB_FIRMWARE_VERSION_620 && (!emu_cfg.enabled || h_cfg.emummc_force_disable))
 		return 1;
 
 	if (f_open(&fp, path, FA_READ) != FR_OK)
 		return 0;
 
+	if (!sept_ctxt)
 		ctxt->atmosphere = true;
 
 	void *fss = malloc(f_size(&fp));
@@ -135,6 +137,8 @@ int parse_fss(launch_ctxt_t *ctxt, const char *path)
 				continue;
 
 			// Load content to launch context.
+			if (!sept_ctxt)
+			{
 				switch (curr_fss_cnt[i].type)
 				{
 				case CNT_TYPE_KIP:
@@ -155,9 +159,26 @@ int parse_fss(launch_ctxt_t *ctxt, const char *path)
 					break;
 				default:
 					continue;
-			// TODO: add more types?
+				}
-			// case CNT_TYPE_SP1:
+			}
-			// case CNT_TYPE_SP2:
+			else
+			{
+				// Load content to launch context.
+				switch (curr_fss_cnt[i].type)
+				{
+				case CNT_TYPE_SP1:
+					memcpy(sept_ctxt->sept_primary, content, curr_fss_cnt[i].size);
+					break;
+				case CNT_TYPE_SP2:
+					if (!memcmp(curr_fss_cnt[i].name, (sept_ctxt->kb < KB_FIRMWARE_VERSION_810) ? "septsecondary00" : "septsecondary01", 15))
+					{
+						memcpy(sept_ctxt->sept_secondary, content, curr_fss_cnt[i].size);
+						sept_used = 1;
+					}
+					break;
+				default:
+					continue;
+				}
 			}
 
 			f_lseek(&fp, curr_fss_cnt[i].offset);
@@ -169,7 +190,7 @@ int parse_fss(launch_ctxt_t *ctxt, const char *path)
 
 		_update_r2p(path);
 
-		return 1;
+		return (!sept_ctxt ? 1 : sept_used);
 	}
 
 	f_close(&fp);
@@ -177,3 +198,14 @@ int parse_fss(launch_ctxt_t *ctxt, const char *path)
 
 	return 0;
 }
+
+int load_sept_from_ffs0(fss0_sept_t *sept_ctxt)
+{
+	LIST_FOREACH_ENTRY(ini_kv_t, kv, &sept_ctxt->cfg_sec->kvs, link)
+	{
+		if (!strcmp("fss0", kv->key))
+			return parse_fss(NULL, kv->val, sept_ctxt);
+	}
+
+	return 0;
+}

bootloader/hos/fss.h

@@ -19,6 +19,16 @@
 
 #include "hos.h"
 
-int parse_fss(launch_ctxt_t *ctxt, const char *path);
+typedef struct _fss0_sept_t
+{
+	u32 kb;
+	ini_sec_t *cfg_sec;
+	void *sept_primary;
+	void *sept_secondary;
+
+} fss0_sept_t;
+
+int parse_fss(launch_ctxt_t *ctxt, const char *path, fss0_sept_t *sept_ctxt);
+int load_sept_from_ffs0(fss0_sept_t *sept_ctxt);
 
 #endif

bootloader/hos/hos_config.c

@@ -213,7 +213,7 @@ static int _config_exo_user_pmu_access(launch_ctxt_t *ctxt, const char *value)
 
 static int _config_fss(launch_ctxt_t *ctxt, const char *value)
 {
-	return parse_fss(ctxt, value);
+	return parse_fss(ctxt, value, NULL);
 }
 
 typedef struct _cfg_handler_t

bootloader/hos/sept.c

@@ -17,6 +17,7 @@
 #include <string.h>
 
 #include "hos.h"
+#include "fss.h"
 #include "sept.h"
 #include "../config/config.h"
 #include "../gfx/di.h"
@@ -73,7 +74,7 @@ extern void reloc_patcher(u32 payload_dst, u32 payload_src, u32 payload_size);
 extern sdmmc_t sd_sdmmc;
 extern sdmmc_storage_t sd_storage;
 
-void check_sept()
+void check_sept(ini_sec_t *cfg_sec)
 {
 	// Check if non-hekate payload is used for sept and restore it.
 	if (h_cfg.sept_run)
@@ -117,7 +118,7 @@ void check_sept()
 	if (pkg1_id->kb >= KB_FIRMWARE_VERSION_700 && !h_cfg.sept_run)
 	{
 		sdmmc_storage_end(&storage);
-		reboot_to_sept((u8 *)pkg1 + pkg1_id->tsec_off, pkg1_id->kb);
+		reboot_to_sept((u8 *)pkg1 + pkg1_id->tsec_off, pkg1_id->kb, cfg_sec);
 	}
 
 out_free:
@@ -125,9 +126,10 @@ out_free:
 	sdmmc_storage_end(&storage);
 }
 
-int reboot_to_sept(const u8 *tsec_fw, u32 kb)
+int reboot_to_sept(const u8 *tsec_fw, u32 kb, ini_sec_t *cfg_sec)
 {
 	FIL fp;
+	bool fss0_sept_used = false;
 
 	// Copy warmboot reboot code and TSEC fw.
 	u32 tsec_fw_size = 0x3000;
@@ -137,6 +139,19 @@ int reboot_to_sept(const u8 *tsec_fw, u32 kb)
 	memcpy((void *)SEPT_PK1T_ADDR, tsec_fw, tsec_fw_size);
 	*(vu32 *)SEPT_TCSZ_ADDR = tsec_fw_size;
 
+	if (cfg_sec)
+	{
+		fss0_sept_t sept_ctxt;
+		sept_ctxt.kb = kb;
+		sept_ctxt.cfg_sec = cfg_sec;
+		sept_ctxt.sept_primary = (void *)SEPT_STG1_ADDR;
+		sept_ctxt.sept_secondary = (void *)SEPT_STG2_ADDR;
+
+		fss0_sept_used = load_sept_from_ffs0(&sept_ctxt);
+	}
+
+	if (!fss0_sept_used)
+	{
 		// Copy sept-primary.
 		if (f_open(&fp, "sept/sept-primary.bin", FA_READ))
 			goto error;
@@ -167,6 +182,7 @@ int reboot_to_sept(const u8 *tsec_fw, u32 kb)
 			goto error;
 		}
 		f_close(&fp);
+	}
 
 	b_cfg.boot_cfg |= (BOOT_CFG_AUTOBOOT_EN | BOOT_CFG_SEPT_RUN);
 

bootloader/hos/sept.h

@@ -19,7 +19,7 @@
 
 #include "../utils/types.h"
 
-void check_sept();
+void check_sept(ini_sec_t *cfg_sec);
-int reboot_to_sept(const u8 *tsec_fw, u32 kb);
+int reboot_to_sept(const u8 *tsec_fw, u32 kb, ini_sec_t *cfg_sec);
 
 #endif

bootloader/main.c

@@ -529,7 +529,7 @@ void ini_list_launcher()
 				payload_path = ini_check_payload_section(cfg_sec);
 
 				if (cfg_sec && !payload_path)
-					check_sept();
+					check_sept(cfg_sec);
 
 				if (!cfg_sec)
 				{
@@ -656,7 +656,7 @@ void launch_firmware()
 			}
 
 			if (cfg_sec && !payload_path)
-				check_sept();
+				check_sept(cfg_sec);
 
 			if (!cfg_sec)
 			{
@@ -793,7 +793,7 @@ static void _auto_launch_firmware()
 	{
 		if (!h_cfg.sept_run)
 			EMC(EMC_SCRATCH0) |= EMC_HEKA_UPD;
-		check_sept();
+		check_sept(NULL);
 	}
 
 	if (!h_cfg.sept_run)
@@ -1055,7 +1055,7 @@ skip_list:
 	}
 	else
 	{
-		check_sept();
+		check_sept(cfg_sec);
 		hos_launch(cfg_sec);
 
 		EPRINTF("\nFailed to launch HOS!");