2 * FreeRTOS Kernel V10.2.0
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3 * Copyright (C) 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
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6 * this software and associated documentation files (the "Software"), to deal in
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7 * the Software without restriction, including without limitation the rights to
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8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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9 * the Software, and t
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11 o permit persons to whom the Software is furnished to do so,
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12 * subject to the following conditions:
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14 * The above copyright notice and this permission notice shall be included in all
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15 * copies or substantial portions of the Software.
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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19 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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20 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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21 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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24 * http://www.FreeRTOS.org
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25 * http://aws.amazon.com/freertos
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27 * 1 tab == 4 spaces!
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31 * The FreeRTOS kernel's RISC-V port is split between the the code that is
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32 * common across all currently supported RISC-V chips (implementations of the
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33 * RISC-V ISA), and code that tailors the port to a specific RISC-V chip:
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35 * + FreeRTOS\Source\portable\GCC\RISC-V-RV32\portASM.S contains the code that
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36 * is common to all currently supported RISC-V chips. There is only one
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37 * portASM.S file because the same file is built for all RISC-V target chips.
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39 * + Header files called freertos_risc_v_chip_specific_extensions.h contain the
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40 * code that tailors the FreeRTOS kernel's RISC-V port to a specific RISC-V
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41 * chip. There are multiple freertos_risc_v_chip_specific_extensions.h files
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42 * as there are multiple RISC-V chip implementations.
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45 * TAKE CARE TO INCLUDE THE CORRECT freertos_risc_v_chip_specific_extensions.h
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46 * HEADER FILE FOR THE CHIP IN USE. This is done using the assembler's (not the
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47 * compiler's!) include path. For example, if the chip in use includes a core
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48 * local interrupter (CLINT) and does not include any chip specific register
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49 * extensions then add the path below to the assembler's include path:
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50 * FreeRTOS\Source\portable\GCC\RISC-V-RV32\chip_specific_extensions\RV32I_CLINT_no_extensions
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55 * This freertos_risc_v_chip_specific_extensions.h is for use with Pulpino Ri5cy
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56 * devices, developed and tested using the Vega board RV32M1RM.
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59 #ifndef __FREERTOS_RISC_V_EXTENSIONS_H__
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60 #define __FREERTOS_RISC_V_EXTENSIONS_H__
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62 #define portasmHAS_CLINT 0
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64 /* Constants to define the additional registers found on the Pulpino RI5KY. */
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65 #define lpstart0 0x7b0
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66 #define lpend0 0x7b1
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67 #define lpcount0 0x7b2
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68 #define lpstart1 0x7b4
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69 #define lpend1 0x7b5
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70 #define lpcount1 0x7b6
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72 /* Six additional registers to save and restore, as per the #defines above. */
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73 #define portasmADDITIONAL_CONTEXT_SIZE 6 /* Must be even number on 32-bit cores. */
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75 /* Save additional registers found on the Pulpino. */
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76 .macro portasmSAVE_ADDITIONAL_REGISTERS
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77 addi sp, sp, -(portasmADDITIONAL_CONTEXT_SIZE * portWORD_SIZE) /* Make room for the additional registers. */
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78 csrr t0, lpstart0 /* Load additional registers into accessible temporary registers. */
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84 sw t0, 1 * portWORD_SIZE( sp )
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85 sw t1, 2 * portWORD_SIZE( sp )
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86 sw t2, 3 * portWORD_SIZE( sp )
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87 sw t3, 4 * portWORD_SIZE( sp )
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88 sw t4, 5 * portWORD_SIZE( sp )
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89 sw t5, 6 * portWORD_SIZE( sp )
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92 /* Restore the additional registers found on the Pulpino. */
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93 .macro portasmRESTORE_ADDITIONAL_REGISTERS
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94 lw t0, 1 * portWORD_SIZE( sp ) /* Load additional registers into accessible temporary registers. */
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95 lw t1, 2 * portWORD_SIZE( sp )
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96 lw t2, 3 * portWORD_SIZE( sp )
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97 lw t3, 4 * portWORD_SIZE( sp )
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98 lw t4, 5 * portWORD_SIZE( sp )
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99 lw t5, 6 * portWORD_SIZE( sp )
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106 addi sp, sp, (portasmADDITIONAL_CONTEXT_SIZE * portWORD_SIZE )/* Remove space added for additional registers. */
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109 #endif /* __FREERTOS_RISC_V_EXTENSIONS_H__ */
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