| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | /* |
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| 3 | * CPU reset routines |
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| 4 | * |
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| 5 | * Copyright (C) 2001 Deep Blue Solutions Ltd. |
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| 6 | * Copyright (C) 2012 ARM Ltd. |
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| 7 | * Copyright (C) 2015 Huawei Futurewei Technologies. |
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| 8 | */ |
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| 9 | |
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| 10 | #include <linux/linkage.h> |
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| 11 | #include <linux/cfi_types.h> |
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| 12 | #include <asm/assembler.h> |
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| 13 | #include <asm/sysreg.h> |
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| 14 | #include <asm/virt.h> |
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| 15 | |
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| 16 | .text |
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| 17 | .pushsection .idmap.text, "a" |
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| 18 | |
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| 19 | /* |
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| 20 | * cpu_soft_restart(el2_switch, entry, arg0, arg1, arg2) |
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| 21 | * |
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| 22 | * @el2_switch: Flag to indicate a switch to EL2 is needed. |
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| 23 | * @entry: Location to jump to for soft reset. |
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| 24 | * arg0: First argument passed to @entry. (relocation list) |
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| 25 | * arg1: Second argument passed to @entry.(physical kernel entry) |
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| 26 | * arg2: Third argument passed to @entry. (physical dtb address) |
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| 27 | * |
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| 28 | * Put the CPU into the same state as it would be if it had been reset, and |
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| 29 | * branch to what would be the reset vector. It must be executed with the |
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| 30 | * flat identity mapping. |
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| 31 | */ |
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| 32 | SYM_TYPED_FUNC_START(cpu_soft_restart) |
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| 33 | mov_q x12, INIT_SCTLR_EL1_MMU_OFF |
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| 34 | pre_disable_mmu_workaround |
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| 35 | /* |
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| 36 | * either disable EL1&0 translation regime or disable EL2&0 translation |
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| 37 | * regime if HCR_EL2.E2H == 1 |
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| 38 | */ |
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| 39 | msr sctlr_el1, x12 |
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| 40 | isb |
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| 41 | |
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| 42 | cbz x0, 1f // el2_switch? |
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| 43 | mov x0, #HVC_SOFT_RESTART |
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| 44 | hvc #0 // no return |
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| 45 | |
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| 46 | 1: mov x8, x1 // entry |
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| 47 | mov x0, x2 // arg0 |
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| 48 | mov x1, x3 // arg1 |
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| 49 | mov x2, x4 // arg2 |
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| 50 | br x8 |
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| 51 | SYM_FUNC_END(cpu_soft_restart) |
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| 52 | |
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| 53 | .popsection |
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| 54 | |
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