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warmboot: add fuse bypass init

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This commit is contained in:
Michael Scire
2018-12-17 13:58:28 -08:00
parent 5f905c6b42
commit a94bee71d2
8 changed files with 250 additions and 3 deletions
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26
exosphere/lp0fw/src/lp0.c
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@@ -19,6 +19,7 @@
#include "mc.h"
#include "pmc.h"
#include "misc.h"
#include "fuse.h"
#include "timer.h"
void reboot(void) {
@@ -30,19 +31,40 @@ void reboot(void) {
}
void lp0_entry_main(warmboot_metadata_t *meta) {
const uint32_t target_firmware = meta->target_firmware;
/* Before doing anything else, ensure some sanity. */
if (meta->magic != WARMBOOT_MAGIC || meta->target_firmware > ATMOSPHERE_TARGET_FIRMWARE_MAX) {
if (meta->magic != WARMBOOT_MAGIC || target_firmware > ATMOSPHERE_TARGET_FIRMWARE_MAX) {
reboot();
}
/* [4.0.0+] First thing warmboot does is disable BPMP access to memory. */
if (meta->target_firmware >= ATMOSPHERE_TARGET_FIRMWARE_400) {
if (target_firmware >= ATMOSPHERE_TARGET_FIRMWARE_400) {
disable_bpmp_access_to_dram();
}
/* Configure debugging depending on FUSE_PRODUCTION_MODE */
configure_device_dbg_settings();
/* Check for downgrade. */
/* NOTE: We implemented this as "return false" */
if (fuse_check_downgrade_status()) {
reboot();
}
if (target_firmware >= ATMOSPHERE_TARGET_FIRMWARE_300) {
/* Nintendo's firmware checks APBDEV_PMC_SECURE_SCRATCH32_0 against a per-warmboot binary value here. */
/* We won't bother with that. */
if (false /* APBDEV_PMC_SECURE_SCRATCH32_0 == WARMBOOT_MAGIC_NUMBER */) {
reboot();
}
}
/* TODO: Check that we're running at the correct physical address. */
/* Setup fuses, disable bypass. */
fuse_configure_fuse_bypass();
/* TODO: stuff */
while (true) { /* TODO: Halt BPMP */ }