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Jeenu Viswambharan58e81482018-04-27 15:06:57 +01001/*
2 * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7#include <asm_macros.S>
8#include <assert_macros.S>
Antonio Nino Diaze0f90632018-12-14 00:18:21 +00009#include <lib/xlat_tables/xlat_tables_v2.h>
Jeenu Viswambharan58e81482018-04-27 15:06:57 +010010
11 .global enable_mmu_direct_el1
Antonio Nino Diaz128de8d2018-08-07 19:59:49 +010012 .global enable_mmu_direct_el2
Jeenu Viswambharan58e81482018-04-27 15:06:57 +010013 .global enable_mmu_direct_el3
14
15 /* Macros to read and write to system register for a given EL. */
16 .macro _msr reg_name, el, gp_reg
17 msr \reg_name\()_el\()\el, \gp_reg
18 .endm
19
20 .macro _mrs gp_reg, reg_name, el
21 mrs \gp_reg, \reg_name\()_el\()\el
22 .endm
23
Antonio Nino Diaz128de8d2018-08-07 19:59:49 +010024 .macro tlbi_invalidate_all el
25 .if \el == 1
26 TLB_INVALIDATE(vmalle1)
27 .elseif \el == 2
28 TLB_INVALIDATE(alle2)
29 .elseif \el == 3
30 TLB_INVALIDATE(alle3)
31 .else
32 .error "EL must be 1, 2 or 3"
33 .endif
34 .endm
35
36 /* void enable_mmu_direct_el<x>(unsigned int flags) */
Jeenu Viswambharan58e81482018-04-27 15:06:57 +010037 .macro define_mmu_enable_func el
38 func enable_mmu_direct_\()el\el
39#if ENABLE_ASSERTIONS
40 _mrs x1, sctlr, \el
41 tst x1, #SCTLR_M_BIT
42 ASM_ASSERT(eq)
43#endif
Antonio Nino Diaz128de8d2018-08-07 19:59:49 +010044 /* Invalidate all TLB entries */
45 tlbi_invalidate_all \el
Jeenu Viswambharan58e81482018-04-27 15:06:57 +010046
47 mov x7, x0
Soby Mathewfcaf1bd2018-10-12 16:40:28 +010048 adrp x0, mmu_cfg_params
49 add x0, x0, :lo12:mmu_cfg_params
Jeenu Viswambharan58e81482018-04-27 15:06:57 +010050
51 /* MAIR */
Antonio Nino Diaz668d9ee2018-07-12 15:44:42 +010052 ldr x1, [x0, #(MMU_CFG_MAIR << 3)]
Jeenu Viswambharan58e81482018-04-27 15:06:57 +010053 _msr mair, \el, x1
54
55 /* TCR */
Antonio Nino Diaz668d9ee2018-07-12 15:44:42 +010056 ldr x2, [x0, #(MMU_CFG_TCR << 3)]
Jeenu Viswambharan58e81482018-04-27 15:06:57 +010057 _msr tcr, \el, x2
58
59 /* TTBR */
Antonio Nino Diaz668d9ee2018-07-12 15:44:42 +010060 ldr x3, [x0, #(MMU_CFG_TTBR0 << 3)]
Jeenu Viswambharan58e81482018-04-27 15:06:57 +010061 _msr ttbr0, \el, x3
62
63 /*
64 * Ensure all translation table writes have drained into memory, the TLB
65 * invalidation is complete, and translation register writes are
66 * committed before enabling the MMU
67 */
68 dsb ish
69 isb
70
71 /* Set and clear required fields of SCTLR */
72 _mrs x4, sctlr, \el
73 mov_imm x5, SCTLR_WXN_BIT | SCTLR_C_BIT | SCTLR_M_BIT
74 orr x4, x4, x5
75
76 /* Additionally, amend SCTLR fields based on flags */
77 bic x5, x4, #SCTLR_C_BIT
78 tst x7, #DISABLE_DCACHE
79 csel x4, x5, x4, ne
80
81 _msr sctlr, \el, x4
82 isb
83
84 ret
85 endfunc enable_mmu_direct_\()el\el
86 .endm
87
88 /*
Antonio Nino Diaz32958ce2019-01-25 13:12:07 +000089 * Define MMU-enabling functions for EL1, EL2 and EL3:
Jeenu Viswambharan58e81482018-04-27 15:06:57 +010090 *
91 * enable_mmu_direct_el1
Antonio Nino Diaz32958ce2019-01-25 13:12:07 +000092 * enable_mmu_direct_el2
Jeenu Viswambharan58e81482018-04-27 15:06:57 +010093 * enable_mmu_direct_el3
94 */
95 define_mmu_enable_func 1
Antonio Nino Diaz128de8d2018-08-07 19:59:49 +010096 define_mmu_enable_func 2
Jeenu Viswambharan58e81482018-04-27 15:06:57 +010097 define_mmu_enable_func 3