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fusee: attempt reboot to self if possible, better abort/fatal handlers

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Michael Scire 2021-09-05 20:57:04 -07:00 • committed by SciresM
parent 005aac5a2b
commit dda7ea6ac2
4 changed files with 71 additions and 46 deletions
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41
fusee/program/source/fusee_fatal.cpp
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@ -15,12 +15,15 @@
*/
#include <exosphere.hpp>
#include "fusee_fatal.hpp"
#include "fusee_external_package.hpp"
#include "fs/fusee_fs_api.hpp"
namespace ams::nxboot {
namespace {
constexpr inline const uintptr_t PMC = secmon::MemoryRegionPhysicalDevicePmc.GetAddress();
Result SaveFatalErrorContext(const ams::impl::FatalErrorContext *ctx) {
/* Create and open the file. */
fs::FileHandle file;
@ -47,6 +50,31 @@ namespace ams::nxboot {
}
NORETURN void RebootToSelf() {
/* Patch SDRAM init to perform an SVC immediately after second write. */
reg::Write(PMC + APBDEV_PMC_SCRATCH45, 0x2E38DFFF);
reg::Write(PMC + APBDEV_PMC_SCRATCH46, 0x6001DC28);
/* Set SVC handler to jump to reboot stub in IRAM. */
reg::Write(PMC + APBDEV_PMC_SCRATCH33, 0x4003F000);
reg::Write(PMC + APBDEV_PMC_SCRATCH40, 0x6000F208);
/* Set boot as warmboot. */
reg::Write(PMC + APBDEV_PMC_SCRATCH0, (1 << 0));
/* Copy reboot stub into high IRAM. */
std::memcpy(reinterpret_cast<void *>(0x4003F000), GetExternalPackage().reboot_stub, sizeof(GetExternalPackage().reboot_stub));
/* Copy our main payload into low IRAM. */
std::memcpy(reinterpret_cast<void *>(0x40010000), GetExternalPackage().fusee, sizeof(GetExternalPackage().fusee));
/* Reboot. */
reg::Write(PMC + APBDEV_PMC_CNTRL, PMC_REG_BITS_ENUM(CNTRL_MAIN_RESET, ENABLE));
/* Wait for the reboot to take. */
AMS_INFINITE_LOOP();
}
void SaveAndShowFatalError() {
/* Get the context (at static location in memory). */
ams::impl::FatalErrorContext *f_ctx = reinterpret_cast<ams::impl::FatalErrorContext *>(0x4003E000);
@ -81,11 +109,16 @@ namespace ams::nxboot {
AMS_INFINITE_LOOP();
}
/* TODO: Reboot to payload. */
pmic::ShutdownSystem(true);
/* Reboot to self, if we can. */
if (GetExternalPackage().header.magic == ExternalPackageHeader::Magic) {
RebootToSelf();
} else {
/* Just do a normal reboot. */
pmic::ShutdownSystem(true);
/* Wait for our reboot to complete. */
AMS_INFINITE_LOOP();
/* Wait for our reboot to complete. */
AMS_INFINITE_LOOP();
}
}
}