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实现 Privileged ISA #9

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13 of 36 tasks
longfangsong opened this issue Oct 29, 2020 · 0 comments
Open
13 of 36 tasks

实现 Privileged ISA #9

longfangsong opened this issue Oct 29, 2020 · 0 comments
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feature request A request for a certain feature hard This issue is very hard to fix help wanted Extra attention is needed high priority This is very important now

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@longfangsong
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longfangsong commented Oct 29, 2020 •
edited by zhoudian64

首先实现M级别的 Privileged ISA
需要实现的寄存器有：

CSR地址空间中：

  • misa
  • mvendorid（固定为0就好了）
  • marchid（暂时固定为0就好了）
  • mimpid
  • mhartid（单核下保持为0就好了）
  • mstatus & mstatush
  • mtvec
  • medeleg & mideleg 在没有其他特权级的情况下暂不需要
  • mip.MEIP
  • mip.MTIP
  • mip.MSIP
  • mie.MEIE
  • mie.MTIE
  • mie.MSIE
  • mcycle
  • minstret
  • mcounteren 在没有其他特权级的情况下暂不需要
  • mcountinhibit
  • mscratch
  • mepc
  • mcause
  • mtval

主地址空间中：

  • mtime（暂时数时钟周期数(=mcycle)就行，日后可能引入其他时钟源）
  • mtimecmp

需要实现的指令有：

  • ecall
  • ebreak
  • mret
  • wfi
  • csrrw
  • csrrs
  • csrrc
  • csrrwi
  • csrrsi
  • csrrci

需要实现的行为有：

  • CSR地址空间
  • 中断处理
@longfangsong longfangsong added feature request A request for a certain feature hard This issue is very hard to fix help wanted Extra attention is needed high priority This is very important now labels Oct 29, 2020
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