mirror of
https://github.com/Decscots/Lockpick_RCM
synced 2024-12-18 22:41:12 +00:00
325 lines
No EOL
6.7 KiB
C
325 lines
No EOL
6.7 KiB
C
/*
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* Copyright (c) 2018 naehrwert
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* Copyright (c) 2018 shuffle2
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* Copyright (c) 2018 balika011
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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 <string.h>
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#include "../soc/fuse.h"
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#include "../soc/t210.h"
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#define ARRAYSIZE(x) (sizeof(x) / sizeof(*x))
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static const u32 evp_thunk_template[] = {
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0xe92d0007, // STMFD SP!, {R0-R2}
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0xe1a0200e, // MOV R2, LR
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0xe2422002, // SUB R2, R2, #2
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0xe5922000, // LDR R2, [R2]
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0xe20220ff, // AND R2, R2, #0xFF
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0xe1a02082, // MOV R2, R2,LSL#1
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0xe59f001c, // LDR R0, =evp_thunk_template
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0xe59f101c, // LDR R1, =thunk_end
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0xe0411000, // SUB R1, R1, R0
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0xe59f0018, // LDR R0, =iram_evp_thunks
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0xe0800001, // ADD R0, R0, R1
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0xe0822000, // ADD R2, R2, R0
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0xe3822001, // ORR R2, R2, #1
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0xe8bd0003, // LDMFD SP!, {R0,R1}
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0xe12fff12, // BX R2
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0x001007b0, // off_1007EC DCD evp_thunk_template
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0x001007f8, // off_1007F0 DCD thunk_end
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0x40004c30, // off_1007F4 DCD iram_evp_thunks
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// thunk_end is here
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};
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static const u32 evp_thunk_template_len = sizeof(evp_thunk_template);
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// treated as 12bit values
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static const u32 hash_vals[] = {1, 2, 4, 8, 0, 3, 5, 6, 7, 9, 10, 11};
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void fuse_disable_program()
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{
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FUSE(FUSE_DISABLEREGPROGRAM) = 1;
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}
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u32 fuse_read_odm(u32 idx)
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{
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return FUSE(FUSE_RESERVED_ODMX(idx));
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}
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void fuse_wait_idle()
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{
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u32 ctrl;
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do
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{
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ctrl = FUSE(FUSE_CTRL);
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} while (((ctrl >> 16) & 0x1f) != 4);
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}
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u32 parity32_even(u32 *words, u32 count)
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{
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u32 acc = words[0];
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for (u32 i = 1; i < count; i++)
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{
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acc ^= words[i];
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}
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u32 lo = ((acc & 0xffff) ^ (acc >> 16)) & 0xff;
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u32 hi = ((acc & 0xffff) ^ (acc >> 16)) >> 8;
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u32 x = hi ^ lo;
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lo = ((x & 0xf) ^ (x >> 4)) & 3;
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hi = ((x & 0xf) ^ (x >> 4)) >> 2;
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x = hi ^ lo;
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return (x & 1) ^ (x >> 1);
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}
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int patch_hash_one(u32 *word)
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{
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u32 bits20_31 = *word & 0xfff00000;
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u32 parity_bit = parity32_even(&bits20_31, 1);
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u32 hash = 0;
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for (u32 i = 0; i < 12; i++)
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{
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if (*word & (1 << (20 + i)))
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{
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hash ^= hash_vals[i];
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}
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}
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if (hash == 0)
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{
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if (parity_bit == 0)
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{
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return 0;
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}
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*word ^= 1 << 24;
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return 1;
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}
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if (parity_bit == 0)
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{
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return 3;
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}
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for (u32 i = 0; i < ARRAYSIZE(hash_vals); i++)
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{
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if (hash_vals[i] == hash)
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{
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*word ^= 1 << (20 + i);
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return 1;
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}
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}
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return 2;
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}
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int patch_hash_multi(u32 *words, u32 count)
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{
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u32 parity_bit = parity32_even(words, count);
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u32 bits0_14 = words[0] & 0x7fff;
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u32 bit15 = words[0] & 0x8000;
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u32 bits16_19 = words[0] & 0xf0000;
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u32 hash = 0;
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words[0] = bits16_19;
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for (u32 i = 0; i < count; i++)
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{
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u32 w = words[i];
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if (w)
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{
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for (u32 bitpos = 0; bitpos < 32; bitpos++)
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{
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if ((w >> bitpos) & 1)
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{
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hash ^= 0x4000 + i * 32 + bitpos;
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}
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}
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}
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}
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hash ^= bits0_14;
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// stupid but this is what original code does.
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// equivalent to original words[0] &= 0xfff00000
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words[0] = bits16_19 ^ bit15 ^ bits0_14;
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if (hash == 0)
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{
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if (parity_bit == 0)
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{
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return 0;
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}
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words[0] ^= 0x8000;
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return 1;
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}
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if (parity_bit == 0)
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{
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return 3;
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}
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u32 bitcount = hash - 0x4000;
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if (bitcount < 16 || bitcount >= count * 32)
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{
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u32 num_set = 0;
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for (u32 bitpos = 0; bitpos < 15; bitpos++)
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{
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if ((hash >> bitpos) & 1)
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{
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num_set++;
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}
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}
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if (num_set != 1)
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{
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return 2;
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}
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words[0] ^= hash;
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return 1;
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}
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words[bitcount / 32] ^= 1 << (hash & 0x1f);
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return 1;
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}
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int fuse_read_ipatch(void (*ipatch)(u32 offset, u32 value))
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{
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u32 words[80];
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u32 word_count;
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u32 word_addr;
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u32 word0 = 0;
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u32 total_read = 0;
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word_count = FUSE(FUSE_FIRST_BOOTROM_PATCH_SIZE);
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word_count &= 0x7f;
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word_addr = 191;
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while (word_count)
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{
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total_read += word_count;
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if (total_read >= ARRAYSIZE(words))
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{
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break;
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}
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for (u32 i = 0; i < word_count; i++)
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{
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FUSE(FUSE_ADDR) = word_addr--;
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FUSE(FUSE_CTRL) = (FUSE(FUSE_ADDR) & ~FUSE_CMD_MASK) | FUSE_READ;
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fuse_wait_idle();
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words[i] = FUSE(FUSE_RDATA);
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}
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word0 = words[0];
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if (patch_hash_multi(words, word_count) >= 2)
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{
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return 1;
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}
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u32 ipatch_count = (words[0] >> 16) & 0xf;
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if (ipatch_count)
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{
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for (u32 i = 0; i < ipatch_count; i++)
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{
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u32 word = words[i + 1];
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u32 addr = (word >> 16) * 2;
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u32 data = word & 0xffff;
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ipatch(addr, data);
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}
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}
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words[0] = word0;
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if ((word0 >> 25) == 0)
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break;
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if (patch_hash_one(&word0) >= 2)
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{
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return 3;
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}
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word_count = word0 >> 25;
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}
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return 0;
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}
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int fuse_read_evp_thunk(u32 *iram_evp_thunks, u32 *iram_evp_thunks_len)
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{
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u32 words[80];
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u32 word_count;
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u32 word_addr;
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u32 word0 = 0;
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u32 total_read = 0;
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int evp_thunk_written = 0;
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void *evp_thunk_dst_addr = 0;
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memset(iram_evp_thunks, 0, *iram_evp_thunks_len);
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word_count = FUSE(FUSE_FIRST_BOOTROM_PATCH_SIZE);
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word_count &= 0x7f;
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word_addr = 191;
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while (word_count)
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{
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total_read += word_count;
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if (total_read >= ARRAYSIZE(words))
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{
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break;
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}
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for (u32 i = 0; i < word_count; i++)
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{
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FUSE(FUSE_ADDR) = word_addr--;
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FUSE(FUSE_CTRL) = (FUSE(FUSE_ADDR) & ~FUSE_CMD_MASK) | FUSE_READ;
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fuse_wait_idle();
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words[i] = FUSE(FUSE_RDATA);
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}
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word0 = words[0];
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if (patch_hash_multi(words, word_count) >= 2)
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{
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return 1;
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}
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u32 ipatch_count = (words[0] >> 16) & 0xf;
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u32 insn_count = word_count - ipatch_count - 1;
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if (insn_count)
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{
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if (!evp_thunk_written)
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{
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evp_thunk_dst_addr = (void *)iram_evp_thunks;
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memcpy(evp_thunk_dst_addr, (void *)evp_thunk_template, evp_thunk_template_len);
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evp_thunk_dst_addr += evp_thunk_template_len;
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evp_thunk_written = 1;
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*iram_evp_thunks_len = evp_thunk_template_len;
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//write32(TEGRA_EXCEPTION_VECTORS_BASE + 0x208, iram_evp_thunks);
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}
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u32 thunk_patch_len = insn_count * sizeof(u32);
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memcpy(evp_thunk_dst_addr, &words[ipatch_count + 1], thunk_patch_len);
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evp_thunk_dst_addr += thunk_patch_len;
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*iram_evp_thunks_len += thunk_patch_len;
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}
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words[0] = word0;
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if ((word0 >> 25) == 0)
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break;
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if (patch_hash_one(&word0) >= 2)
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{
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return 3;
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}
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word_count = word0 >> 25;
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}
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return 0;
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}
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void read_raw_ipatch_fuses(u32 *words)
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{
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for (u32 i = 0; i < 0x100; i++)
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{
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FUSE(FUSE_ADDR) = i;
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FUSE(FUSE_CTRL) = (FUSE(FUSE_ADDR) & ~FUSE_CMD_MASK) | FUSE_READ;
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fuse_wait_idle();
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words[i] = FUSE(FUSE_RDATA);
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}
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} |