OS in Golang

0316320 吳赫倫

outline

• gopher-os
• implementation 
• conclusion

gopher-os

• https://github.com/achilleasa/gopher-os
• experimental OS in Go
• without interrupt
• virtual memory system in progress

rt0_32.s

• the entrance of kernel
• bootloader jump to kernel in protected mode
• interrupt and paging are disable
• flow
  • copy multiboot data
  • check processor features
  • initial page table, enable paging and longmode

rt0_32.s

rt0_32.s

rt0_32.s

rt0_32.s

rt0_32.s

rt0_32.s

rt0_32.s

rt0_32.s

rt0_64.s

• enter kernel written in golang

rt0_64.s

kmain.go

• core functions written in golang
• setup multiboot data pointer
• initial terminal
• physical memory initialize (just print memory map)

kmain.go

hal.go

conclusion

• symbol issue

• asm issue
  • no c-like inline asm
• communication between asm and go
  • sharing data structure
  • sharing 
• switching between asm and go

conclusion

• using gccgo
  • gcc compiler with go-frontend
  • gccgo / go are different tool chain