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[dhcp] Include support for PXE boot menus

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PXE dictates a mechanism for boot menuing, involving prompting the
user with a variable message, waiting for a predefined keypress,
displaying a boot menu, and waiting for a selection.

This breaks the currently desirable abstraction that DHCP is a process
that can happen in the background without any user interaction.
This commit is contained in:
Michael Brown
2009-01-25 21:16:47 +00:00
parent f1d17ae2be
commit 027c72e0d0
2 changed files with 197 additions and 14 deletions
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5
src/include/gpxe/dhcp.h
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@@ -88,6 +88,9 @@ struct dhcp_pxe_boot_menu_item;
/** PXE boot menu */
#define DHCP_PXE_BOOT_MENU DHCP_ENCAP_OPT ( DHCP_VENDOR_ENCAP, 9 )
/** PXE boot menu prompt */
#define DHCP_PXE_BOOT_MENU_PROMPT DHCP_ENCAP_OPT ( DHCP_VENDOR_ENCAP, 10 )
/** PXE boot menu item */
#define DHCP_PXE_BOOT_MENU_ITEM DHCP_ENCAP_OPT ( DHCP_VENDOR_ENCAP, 71 )
@@ -478,7 +481,7 @@ struct dhcphdr {
#define DHCP_MIN_LEN 552
/** Maximum time that we will wait for ProxyDHCP responses */
#define PROXYDHCP_WAIT_TIME ( TICKS_PER_SEC * 1 )
#define PROXYDHCP_WAIT_TIME ( 2 * TICKS_PER_SEC )
/** Timeouts for sending DHCP packets */
#define DHCP_MIN_TIMEOUT ( 1 * TICKS_PER_SEC )