Dell Calling Interface (Type 218)

Source: Dell libsmbios, src/libsmbios_c/token/token_impl.h.

Describes the interface for issuing commands to the firmware through an I/O port, and tokens, which are stored in non-volatile storage and accessed with these commands.

Table 1. Dell Calling Interface structure
Offset	Version	Name	Length	Value	Description
`0x00`	2.0+	Type	`BYTE`	`218`	Dell Calling Interface indicator
`0x01`	2.0+	Length	`BYTE`	Varies	Length of the structure
`0x02`	2.0+	Handle	`WORD`	Varies
`0x04`	2.0+	Command I/O Address	`WORD`	`ADDRESS`	I/O port, which is written to issue a command
`0x06`	2.0+	Command I/O Code	`BYTE`	`NUMBER`	Value, which is written to the command I/O port
`0x07`	2.0+	Supported Commands	`DWORD`	`BITFIELD`
`0x0B`	2.0+	Tokens	Varies	Varies	Tokens, see Tokens. The table is terminated by a token with ID `0xFFFF`, tokens with ID `0x0000` are unused.

1. Dell Calling Interface — Tokens

Table 2. Dell Calling Interface: Token
Offset	Name	Length	Value	Description
`0x00`	Token ID	`WORD`	`NUMBER`
`0x02`	Location	`WORD`	`NUMBER`	Location of the token in non-volatile storage, zero for string tokens
`0x04`	Value / String Length	`WORD`	`NUMBER`	Token value, or length of the string for string tokens