Atmosphere/stratosphere/ams_mitm/source/bpc_mitm/bpcmitm_reboot_manager.cpp

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/*
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* Copyright (c) 2018-2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <switch.h>
#include <stratosphere.hpp>
#include <strings.h>
#include "bpcmitm_reboot_manager.hpp"
#include "../utils.hpp"
/* TODO: Find a way to pre-populate this with the contents of fusee-primary. */
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static u8 g_reboot_payload[IRAM_PAYLOAD_MAX_SIZE] __attribute__ ((aligned (0x1000)));
static u8 g_work_page[0x1000] __attribute__ ((aligned (0x1000)));
static bool g_payload_loaded = false;
static BpcRebootType g_reboot_type = BpcRebootType::ToPayload;
void BpcRebootManager::Initialize() {
/* Open payload file. */
FsFile payload_file;
if (R_FAILED(Utils::OpenSdFile("/atmosphere/reboot_payload.bin", FS_OPEN_READ, &payload_file))) {
return;
}
ON_SCOPE_EXIT { fsFileClose(&payload_file); };
/* Clear payload buffer */
std::memset(g_reboot_payload, 0xFF, sizeof(g_reboot_payload));
/* Read payload file. */
size_t actual_size;
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fsFileRead(&payload_file, 0, g_reboot_payload, IRAM_PAYLOAD_MAX_SIZE, FS_READOPTION_NONE, &actual_size);
g_payload_loaded = true;
/* Figure out what kind of reboot we're gonna be doing. */
{
char reboot_type[0x40] = {0};
u64 reboot_type_size = 0;
if (R_SUCCEEDED(Utils::GetSettingsItemValue("atmosphere", "power_menu_reboot_function", reboot_type, sizeof(reboot_type)-1, &reboot_type_size))) {
if (strcasecmp(reboot_type, "stock") == 0 || strcasecmp(reboot_type, "normal") == 0 || strcasecmp(reboot_type, "standard") == 0) {
g_reboot_type = BpcRebootType::Standard;
} else if (strcasecmp(reboot_type, "rcm") == 0) {
g_reboot_type = BpcRebootType::ToRcm;
} else if (strcasecmp(reboot_type, "payload") == 0) {
g_reboot_type = BpcRebootType::ToPayload;
}
}
}
}
static void ClearIram() {
/* Make page FFs. */
memset(g_work_page, 0xFF, sizeof(g_work_page));
/* Overwrite all of IRAM with FFs. */
for (size_t ofs = 0; ofs < IRAM_SIZE; ofs += sizeof(g_work_page)) {
CopyToIram(IRAM_BASE + ofs, g_work_page, sizeof(g_work_page));
}
}
static void DoRebootToPayload() {
/* If we don't actually have a payload loaded, just go to RCM. */
if (!g_payload_loaded) {
RebootToRcm();
}
/* Ensure clean IRAM state. */
ClearIram();
/* Copy in payload. */
for (size_t ofs = 0; ofs < sizeof(g_reboot_payload); ofs += 0x1000) {
CopyToIram(IRAM_PAYLOAD_BASE + ofs, &g_reboot_payload[ofs], 0x1000);
}
RebootToIramPayload();
}
Result BpcRebootManager::PerformReboot() {
switch (g_reboot_type) {
case BpcRebootType::Standard:
return ResultAtmosphereMitmShouldForwardToSession;
case BpcRebootType::ToRcm:
RebootToRcm();
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return ResultSuccess;
case BpcRebootType::ToPayload:
default:
DoRebootToPayload();
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return ResultSuccess;
}
}
void BpcRebootManager::RebootForFatalError(AtmosphereFatalErrorContext *ctx) {
/* Ensure clean IRAM state. */
ClearIram();
/* Copy in payload. */
for (size_t ofs = 0; ofs < sizeof(g_reboot_payload); ofs += 0x1000) {
CopyToIram(IRAM_PAYLOAD_BASE + ofs, &g_reboot_payload[ofs], 0x1000);
}
memcpy(g_work_page, ctx, sizeof(*ctx));
CopyToIram(IRAM_PAYLOAD_BASE + IRAM_PAYLOAD_MAX_SIZE, g_work_page, sizeof(g_work_page));
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/* If we don't actually have a payload loaded, just go to RCM. */
if (!g_payload_loaded) {
RebootToRcm();
}
RebootToIramPayload();
}