1 /*
2 * Copyright (c) 2014 Wind River Systems, Inc.
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 /**
8 * @file
9 * @brief Full C support initialization
10 *
11 *
12 * Initialization of full C support: zero the .bss, copy the .data if XIP,
13 * call z_cstart().
14 *
15 * Stack is available in this module, but not the global data/bss until their
16 * initialization is performed.
17 */
18
19 #include <zephyr/types.h>
20 #include <zephyr/toolchain.h>
21 #include <zephyr/linker/linker-defs.h>
22 #include <zephyr/arch/arc/v2/aux_regs.h>
23 #include <zephyr/arch/arc/cluster.h>
24 #include <zephyr/kernel_structs.h>
25 #include <kernel_internal.h>
26 #include <zephyr/platform/hooks.h>
27 #include <zephyr/arch/cache.h>
28
29 #ifdef CONFIG_ISA_ARCV3
30 /* NOTE: it will be called from early C code - we must NOT use global / static variables in it! */
arc_cluster_scm_enable(void)31 static void arc_cluster_scm_enable(void)
32 {
33 unsigned int cluster_version;
34
35 /* Check that we have cluster and its version is supported */
36 cluster_version = z_arc_v2_aux_reg_read(_ARC_REG_CLN_BCR) & _ARC_CLN_BCR_VER_MAJOR_MASK;
37 if (cluster_version < _ARC_REG_CLN_BCR_VER_MAJOR_ARCV3_MIN) {
38 return;
39 }
40
41 /* Check that we have shared cache in cluster */
42 if (!(z_arc_v2_aux_reg_read(_ARC_CLNR_BCR_0) & _ARC_CLNR_BCR_0_HAS_SCM)) {
43 return;
44 }
45
46 /* Disable SCM, just in case. */
47 arc_cln_write_reg_nolock(ARC_CLN_CACHE_STATUS, 0);
48
49 /* Invalidate SCM before enabling. */
50 arc_cln_write_reg_nolock(ARC_CLN_CACHE_CMD,
51 ARC_CLN_CACHE_CMD_OP_REG_INV | ARC_CLN_CACHE_CMD_INCR);
52 while (arc_cln_read_reg_nolock(ARC_CLN_CACHE_STATUS) & ARC_CLN_CACHE_STATUS_BUSY) {
53 }
54
55 arc_cln_write_reg_nolock(ARC_CLN_CACHE_STATUS, ARC_CLN_CACHE_STATUS_EN);
56 }
57 #endif /* CONFIG_ISA_ARCV3 */
58
59 #ifdef __CCAC__
60 extern char __device_states_start[];
61 extern char __device_states_end[];
62 /**
63 * @brief Clear device_states section
64 *
65 * This routine clears the device_states section,
66 * as MW compiler marks the section with NOLOAD flag.
67 */
dev_state_zero(void)68 static void dev_state_zero(void)
69 {
70 z_early_memset(__device_states_start, 0, __device_states_end - __device_states_start);
71 }
72 #endif
73
74 extern FUNC_NORETURN void z_cstart(void);
75 extern void arc_mpu_init(void);
76 extern void arc_secureshield_init(void);
77
78 /**
79 * @brief Prepare to and run C code
80 *
81 * This routine prepares for the execution of and runs C code.
82 */
83
z_prep_c(void)84 void z_prep_c(void)
85 {
86 #if defined(CONFIG_SOC_PREP_HOOK)
87 soc_prep_hook();
88 #endif
89
90 #ifdef CONFIG_ISA_ARCV3
91 arc_cluster_scm_enable();
92 #endif
93
94 z_bss_zero();
95 #ifdef __CCAC__
96 dev_state_zero();
97 #endif
98 z_data_copy();
99 #if CONFIG_ARCH_CACHE
100 arch_cache_init();
101 #endif
102 #ifdef CONFIG_ARC_MPU
103 arc_mpu_init();
104 #endif
105 #ifdef CONFIG_ARC_SECURE_FIRMWARE
106 arc_secureshield_init();
107 #endif
108 z_cstart();
109 CODE_UNREACHABLE;
110 }
111