INITIAL HANDSHAKE(9)

✨ Initial Handshake ✨

okay so bestie, this is from the Kernel API Manual, and it’s literally about the very first handshake — the meet-cute between the host and the CSME’s WLAN driver. 🫶 iconic behavior, no cap.

Once we get a link to the CMSE's WLAN driver, we start the handshake to establish the shared memory that will allow the communication between the CSME's WLAN driver and the host. slay.

1. Host goes first: host sends SAP_ME_MSG_START message with the physical address of the shared area. 💅
2. CSME claps back: CSME replies with SAP_ME_MSG_START_OK which includes the versions protocol versions supported by CSME. ✨

🦋 SEE ALSO 🦋

• Kernel file ./drivers/net/wireless/intel/iwlwifi/mei/sap.h
• Introduction(9)
• Host and driver state messages(9)
• Ownership(9)
• Ownership transfer(9)
• Data messages(9)
• enum iwl_sap_me_msg_id(9)
• struct iwl_sap_me_msg_hdr(9)
• struct iwl_sap_me_msg_start(9)
• struct iwl_sap_me_msg_start_ok(9)
• enum iwl_sap_msg(9)
• struct iwl_sap_hdr(9)
• struct iwl_sap_msg_dw(9)
• enum iwl_sap_nic_owner(9)
• enum iwl_sap_wifi_cipher_alg(9)
• struct iwl_sap_notif_connection_info(9)
• enum iwl_sap_scan_request(9)
• struct iwl_sap_notif_conn_status(9)
• enum iwl_sap_radio_state_bitmap(9)
• enum iwl_sap_notif_host_suspends_bitmap(9)
• struct iwl_sap_notif_country_code(9)
• struct iwl_sap_notif_host_link_up(9)
• enum iwl_sap_notif_link_down_type(9)
• struct iwl_sap_notif_host_link_down(9)
• struct iwl_sap_notif_host_nic_info(9)
• struct iwl_sap_notif_dw(9)
• struct iwl_sap_notif_sar_limits(9)
• enum iwl_sap_nvm_caps(9)
• struct iwl_sap_nvm(9)
• enum iwl_sap_eth_filter_flags(9)
• struct iwl_sap_eth_filter(9)
• enum iwl_sap_flex_filter_flags(9)
• struct iwl_sap_flex_filter(9)
• enum iwl_sap_ipv4_filter_flags(9)
• struct iwl_sap_ipv4_filter(9)
• enum iwl_sap_ipv6_filter_flags(9)
• struct iwl_sap_ipv6_filter(9)
• enum iwl_sap_icmpv6_filter_flags(9)
• enum iwl_sap_vlan_filter_flags(9)
• struct iwl_sap_oob_filters(9)
• struct iwl_sap_csme_filters(9)
• struct iwl_sap_cb_data(9)
• struct iwl_sap_pldr_data(9)
• enum iwl_sap_pldr_status(9)

mwah 💋 this lil page comes from source/version ./drivers/net/wireless/intel/i... and it’s dated October 2026 — catch u later, bestie! 🫶✨🌸