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73 lines
2.8 KiB
ArmAsm
73 lines
2.8 KiB
ArmAsm
/*
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* Copyright (C) 2016 Bernhard Nortmann <bernhard.nortmann@web.de>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/*
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* ARM thunk code to read the SID root key using register-based access.
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*
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* This is necessary for certain SoCs (e.g. H3), as the values read via
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* memory mapping might not be consistent. For background information see
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* https://groups.google.com/forum/#!topic/linux-sunxi/ynyIP8c61Qs
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*/
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SID_BASE .req r0
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sid_key_index .req r1
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.set SID_PRCTL, 0x40 /* SID program/read control register */
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.set SID_PRKEY, 0x50 /* SID program key value register */
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.set SID_RDKEY, 0x60 /* SID read key value register */
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.set SID_OP_LOCK, 0xAC /* Efuse operation lock value */
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.set SID_READ_START, (1 << 1) /* bit 1 of SID_PRCTL, Software Read Start */
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.set SID_PG_START, (1 << 0) /* bit 0 of SID_PRCTL, Software Program Start */
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sid_read_root_key:
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ldr SID_BASE, sid_base
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mov sid_key_index, #0
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adr r3, sid_result /* result pointer */
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sid_read_loop:
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mov r2, sid_key_index, lsl #16 /* PG_INDEX value */
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orr r2, #SID_OP_LOCK << 8 /* OP_LOCK to enable SID_READ_START */
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orr r2, #SID_READ_START
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str r2, [SID_BASE, #SID_PRCTL] /* write SID_PRCTL */
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sid_read_wait:
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ldr r2, [SID_BASE, #SID_PRCTL] /* read SID_PRCTL */
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tst r2, #SID_READ_START /* check if read operation completed */
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bne sid_read_wait /* loop while bit 1 still set */
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ldr r2, [SID_BASE, #SID_RDKEY] /* read SID key value */
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str r2, [r3, sid_key_index] /* store SID value */
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add sid_key_index, #4
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cmp sid_key_index, #16
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blo sid_read_loop /* loop while (sid_key_index < 0x10) */
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mov r2, #0
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str r2, [SID_BASE, #SID_PRCTL] /* clear SID_PRCTL */
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bx lr
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sid_base: .word 0
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sid_result: .word 0 /* receives the four "root key" 32-bit words */
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.word 0
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.word 0
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.word 0
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