c34960bc87
Because MMU and MPU should not be enabled together and they provide the same functionalities. Signed-off-by: Huifeng Zhang <Huifeng.Zhang@arm.com>
68 lines
1.3 KiB
C
68 lines
1.3 KiB
C
/*
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* Copyright (c) 2019 Carlo Caione <ccaione@baylibre.com>
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief Full C support initialization
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*
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* Initialization of full C support: zero the .bss and call z_cstart().
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*
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* Stack is available in this module, but not the global data/bss until their
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* initialization is performed.
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*/
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#include <kernel_internal.h>
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#include <linker/linker-defs.h>
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__weak void z_arm64_mm_init(bool is_primary_core) { }
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extern FUNC_NORETURN void z_cstart(void);
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extern void z_arm64_mm_init(bool is_primary_core);
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static inline void z_arm64_bss_zero(void)
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{
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uint64_t *p = (uint64_t *)__bss_start;
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uint64_t *end = (uint64_t *)__bss_end;
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while (p < end) {
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*p++ = 0U;
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}
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}
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/**
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*
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* @brief Prepare to and run C code
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*
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* This routine prepares for the execution of and runs C code.
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*
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* @return N/A
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*/
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void z_arm64_prep_c(void)
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{
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/* Initialize tpidrro_el0 with our struct _cpu instance address */
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write_tpidrro_el0((uintptr_t)&_kernel.cpus[0]);
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z_arm64_bss_zero();
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#ifdef CONFIG_XIP
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z_data_copy();
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#endif
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z_arm64_mm_init(true);
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z_arm64_interrupt_init();
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z_cstart();
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CODE_UNREACHABLE;
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}
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#if CONFIG_MP_NUM_CPUS > 1
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extern FUNC_NORETURN void z_arm64_secondary_start(void);
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void z_arm64_secondary_prep_c(void)
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{
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z_arm64_secondary_start();
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CODE_UNREACHABLE;
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}
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#endif
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