drivers: add description of cache
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@ -3,6 +3,19 @@
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#include <pmp.h>
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#include <klib.h>
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// these functions are interface for cache
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// uintptr_t _l1cache_op_read(int op_idx): return value in the cache cop csr
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// uintptr_t _l1cache_data_read(int data_idx): return data in the cache data csr
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// void _l1cache_op_write(int op_idx, uintptr_t val): set value in the cache cop csr
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// void _l1cache_data_write(int data_idx, uintptr_t val): set data in the cache data csr
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// when testing, can use these interface in nexus-am/tests/amtest/src/tests/cache.c
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// void _l3cache_tag(int tag): set value of tag in l3chache
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// void _l3cache_set(int set): set value of tag in l3chache
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// void _l3cache_cmd(int cmd): set value of tag in l3chache
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// when testing, can use these interface in nexus-am/tests/dualcoretest/tests/huancunop.c
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uintptr_t _l1cache_op_read(int op_idx) {
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uintptr_t op;
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switch(op_idx){
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@ -2,11 +2,11 @@
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#include <pmp.h>
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#include <klib.h>
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// this functions are interface for pma
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// _pma_get_addr(int addr_idx): return value in the pmpaddr csr
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// _pma_get_cfg(int cfg_idx): return value in the pmpefg csr
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// _pma_set_addr(int addr_idx, uintptr_t val): modify value in the pmpaddr csr
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// _pma_set_cfg(int cfg_idx, uintptr_t val): modify value in the pmpcfg csr
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// these functions are interface for pma
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// uintptr_t _pma_get_addr(int addr_idx): return value in the pmpaddr csr
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// uintptr_t _pma_get_cfg(int cfg_idx): return value in the pmpefg csr
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// void _pma_set_addr(int addr_idx, uintptr_t val): modify value in the pmpaddr csr
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// void _pma_set_cfg(int cfg_idx, uintptr_t val): modify value in the pmpcfg csr
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// when testing pma:
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// firstly, using _cfg = _pma_get_cfg(cfg_idx), get the value of cfg
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// secondly, using _cfg = _cfg | PMP_W, or using _cfg = _cfg & ~PMP_W, to set the permission
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