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 <zephyr/arch/common/xip.h>
26 #include <zephyr/arch/common/init.h>
27 #include <zephyr/platform/hooks.h>
28 #include <zephyr/arch/cache.h>
29
30 #ifdef CONFIG_ISA_ARCV3
31 /* NOTE: it will be called from early C code - we must NOT use global / static variables in it! */
arc_cluster_scm_enable(void)32 static void arc_cluster_scm_enable(void)
33 {
34 unsigned int cluster_version;
35
36 /* Check that we have cluster and its version is supported */
37 cluster_version = z_arc_v2_aux_reg_read(_ARC_REG_CLN_BCR) & _ARC_CLN_BCR_VER_MAJOR_MASK;
38 if (cluster_version < _ARC_REG_CLN_BCR_VER_MAJOR_ARCV3_MIN) {
39 return;
40 }
41
42 /* Check that we have shared cache in cluster */
43 if (!(z_arc_v2_aux_reg_read(_ARC_CLNR_BCR_0) & _ARC_CLNR_BCR_0_HAS_SCM)) {
44 return;
45 }
46
47 /* Disable SCM, just in case. */
48 arc_cln_write_reg_nolock(ARC_CLN_CACHE_STATUS, 0);
49
50 /* Invalidate SCM before enabling. */
51 arc_cln_write_reg_nolock(ARC_CLN_CACHE_CMD,
52 ARC_CLN_CACHE_CMD_OP_REG_INV | ARC_CLN_CACHE_CMD_INCR);
53 while (arc_cln_read_reg_nolock(ARC_CLN_CACHE_STATUS) & ARC_CLN_CACHE_STATUS_BUSY) {
54 }
55
56 arc_cln_write_reg_nolock(ARC_CLN_CACHE_STATUS, ARC_CLN_CACHE_STATUS_EN);
57 }
58 #endif /* CONFIG_ISA_ARCV3 */
59
60 #ifdef __CCAC__
61 extern char __device_states_start[];
62 extern char __device_states_end[];
63 /**
64 * @brief Clear device_states section
65 *
66 * This routine clears the device_states section,
67 * as MW compiler marks the section with NOLOAD flag.
68 */
dev_state_zero(void)69 static void dev_state_zero(void)
70 {
71 arch_early_memset(__device_states_start, 0, __device_states_end - __device_states_start);
72 }
73 #endif
74
75 extern FUNC_NORETURN void z_cstart(void);
76 extern void arc_mpu_init(void);
77 extern void arc_secureshield_init(void);
78
79 /**
80 * @brief Prepare to and run C code
81 *
82 * This routine prepares for the execution of and runs C code.
83 */
84
z_prep_c(void)85 FUNC_NORETURN void z_prep_c(void)
86 {
87 soc_prep_hook();
88
89 #ifdef CONFIG_ISA_ARCV3
90 arc_cluster_scm_enable();
91 #endif
92
93 arch_bss_zero();
94 #ifdef __CCAC__
95 dev_state_zero();
96 #endif
97 arch_data_copy();
98 #if CONFIG_ARCH_CACHE
99 arch_cache_init();
100 #endif
101 #ifdef CONFIG_ARC_MPU
102 arc_mpu_init();
103 #endif
104 #ifdef CONFIG_ARC_SECURE_FIRMWARE
105 arc_secureshield_init();
106 #endif
107 z_cstart();
108 CODE_UNREACHABLE;
109 }
110
