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/kernel_structs.h> 24 #include <kernel_internal.h> 25 26 27 /* XXX - keep for future use in full-featured cache APIs */ 28 #if 0 29 /** 30 * @brief Disable the i-cache if present 31 * 32 * For those ARC CPUs that have a i-cache present, 33 * invalidate the i-cache and then disable it. 34 */ 35 36 static void disable_icache(void) 37 { 38 unsigned int val; 39 40 val = z_arc_v2_aux_reg_read(_ARC_V2_I_CACHE_BUILD); 41 val &= 0xff; /* version field */ 42 if (val == 0) { 43 return; /* skip if i-cache is not present */ 44 } 45 z_arc_v2_aux_reg_write(_ARC_V2_IC_IVIC, 0); 46 __builtin_arc_nop(); 47 z_arc_v2_aux_reg_write(_ARC_V2_IC_CTRL, 1); 48 } 49 50 /** 51 * @brief Invalidate the data cache if present 52 * 53 * For those ARC CPUs that have a data cache present, 54 * invalidate the data cache. 55 */ 56 57 static void invalidate_dcache(void) 58 { 59 unsigned int val; 60 61 val = z_arc_v2_aux_reg_read(_ARC_V2_D_CACHE_BUILD); 62 val &= 0xff; /* version field */ 63 if (val == 0) { 64 return; /* skip if d-cache is not present */ 65 } 66 z_arc_v2_aux_reg_write(_ARC_V2_DC_IVDC, 1); 67 } 68 #endif 69 70 extern FUNC_NORETURN void z_cstart(void); 71 /** 72 * @brief Prepare to and run C code 73 * 74 * This routine prepares for the execution of and runs C code. 75 */ 76 _PrepC(void)77void _PrepC(void) 78 { 79 z_bss_zero(); 80 z_data_copy(); 81 z_cstart(); 82 CODE_UNREACHABLE; 83 } 84
