acpi_ps_peek_opcode
u16 acpi_ps_peek_opcode(struct acpi_parse_state *state);
opcode = acpi_ps_peek_opcode(&parser_state);
subop = acpi_ps_peek_opcode(parser_state);
subop = acpi_ps_peek_opcode(parser_state);
walk_state->opcode = acpi_ps_peek_opcode(&(walk_state->parser_state));