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https://github.com/Atmosphere-NX/Atmosphere.git
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75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
/*
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* Copyright (c) 2018 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdint.h>
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#include "utils.h"
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#include "fuse.h"
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#include "car.h"
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#include "pmc.h"
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#define NUM_FUSE_BYPASS_ENTRIES 0
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bool fuse_check_downgrade_status(void) {
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/* We aren't going to implement anti-downgrade. */
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return false;
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}
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void fuse_disable_programming(void) {
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FUSE_REGS->FUSE_DIS_PGM = 1;
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}
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static fuse_bypass_data_t g_fuse_bypass_entries[NUM_FUSE_BYPASS_ENTRIES] = {
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/* No entries here. */
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};
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void fuse_configure_fuse_bypass(void) {
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/* Enable fuses in CAR? This seems to affect fuse data visibility. */
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CLK_RST_CONTROLLER_MISC_CLK_ENB_0 |= 0x10000000;
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/* Configure bypass/override, only if programming is allowed. */
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if (!(FUSE_REGS->FUSE_DIS_PGM & 1)) {
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/* Enable write access. */
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FUSE_REGS->FUSE_WRITE_ACCESS = (FUSE_REGS->FUSE_WRITE_ACCESS & ~0x1) | 0x10000;
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/* Enable fuse bypass config. */
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FUSE_REGS->FUSE_FUSEBYPASS = 1;
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/* Override fuses. */
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for (size_t i = 0; i < NUM_FUSE_BYPASS_ENTRIES; i++) {
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MAKE_FUSE_REG(g_fuse_bypass_entries[i].offset) = g_fuse_bypass_entries[i].value;
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}
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/* Disable fuse write access. */
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FUSE_REGS->FUSE_WRITE_ACCESS |= 1;
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/* Enable fuse bypass config. */
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/* I think this is a bug, and Nintendo meant to write 0 here? */
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FUSE_REGS->FUSE_FUSEBYPASS = 1;
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/* This...clears the disable programming bit(?). */
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/* I have no idea why this happens. What? */
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/* This is probably also either a bug or does nothing. */
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/* Is this bit even clearable? */
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FUSE_REGS->FUSE_DIS_PGM &= 0xFFFFFFFE;
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/* Restore saved private key disable bit. */
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FUSE_REGS->FUSE_PRIVATEKEYDISABLE |= (APBDEV_PMC_SECURE_SCRATCH21_0 & 0x10);
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/* Lock private key disable secure scratch. */
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APBDEV_PMC_SEC_DISABLE2_0 |= 0x4000000;
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}
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}
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