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Implement functions for reading/writing from/to IO ports

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This commit is contained in:
Achilleas Anagnostopoulos 2017-06-29 07:12:51 +01:00
parent e4879b9f8a
commit 4f3312b85d
2 changed files with 56 additions and 0 deletions
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18
src/gopheros/kernel/cpu/cpu_amd64.go
View File

@ -38,3 +38,21 @@ func IsIntel() bool {
edx == 0x49656e69 && // "ineI"
ecx == 0x6c65746e // "ntel"
}
// PortWriteByte writes a uint8 value to the requested port.
func PortWriteByte(port uint16, val uint8)
// PortWriteWord writes a uint16 value to the requested port.
func PortWriteWord(port uint16, val uint16)
// PortWriteDword writes a uint32 value to the requested port.
func PortWriteDword(port uint16, val uint32)
// PortReadByte reads a uint8 value from the requested port.
func PortReadByte(port uint16) uint8
// PortReadWord reads a uint16 value from the requested port.
func PortReadWord(port uint16) uint16
// PortReadDword reads a uint32 value from the requested port.
func PortReadDword(port uint16) uint32

38
src/gopheros/kernel/cpu/cpu_amd64.s
View File

@ -40,3 +40,41 @@ TEXT ·ID(SB),NOSPLIT,$0
MOVL CX, ret+8(FP)
MOVL DX, ret+12(FP)
RET
TEXT ·PortWriteByte(SB),NOSPLIT,$0
MOVW port+0(FP), DX
MOVB val+0(FP), AX
BYTE $0xee // out al, dx
RET
TEXT ·PortWriteWord(SB),NOSPLIT,$0
MOVW port+0(FP), DX
MOVW val+0(FP), AX
BYTE $0x66
BYTE $0xef // out ax, dx
RET
TEXT ·PortWriteDword(SB),NOSPLIT,$0
MOVW port+0(FP), DX
MOVL val+0(FP), AX
BYTE $0xef // out eax, dx
RET
TEXT ·PortReadByte(SB),NOSPLIT,$0
MOVW port+0(FP), DX
BYTE $0xec // in al, dx
MOVB AX, ret+0(FP)
RET
TEXT ·PortReadWord(SB),NOSPLIT,$0
MOVW port+0(FP), DX
BYTE $0x66
BYTE $0xed // in ax, dx
MOVW AX, ret+0(FP)
RET
TEXT ·PortReadDword(SB),NOSPLIT,$0
MOVW port+0(FP), DX
BYTE $0xed // in eax, dx
MOVL AX, ret+0(FP)
RET