mirror of
https://github.com/xcat2/xcat-dep.git
synced 2024-12-25 12:41:33 +00:00
129 lines
3.4 KiB
Diff
129 lines
3.4 KiB
Diff
--- gpxe_src/src/arch/i386/prefix/romprefix.S 2010-01-18 21:06:58.000000000 -0500
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+++ gpxe_src.int18/src/arch/i386/prefix/romprefix.S 2010-01-20 11:19:31.000000000 -0500
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@@ -145,7 +145,7 @@
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* Determine whether or not this is a PnP system via a signature
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* check. If it is PnP, return to the PnP BIOS indicating that we are
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* a boot-capable device; the BIOS will call our boot execution vector
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- * if it wants to boot us. If it is not PnP, hook INT 19.
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+ * if it wants to boot us. If it is not PnP, hook INT 18.
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*/
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init:
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/* Preserve registers, clear direction flag, set %ds=%cs */
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@@ -273,19 +273,17 @@
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testw %ax, %ax
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je got_bbs
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no_pnp: /* Not PnP-compliant - therefore cannot be BBS-compliant */
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-no_bbs: /* Not BBS-compliant - must hook INT 19 */
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- movw $init_message_int19, %si
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+no_bbs: /* Not BBS-compliant - hooking INT 18 */
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+ movw $init_message_int18, %si
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xorw %di, %di
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call print_message
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xorw %ax, %ax
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movw %ax, %es
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- pushl %es:( 0x19 * 4 )
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- popl orig_int19
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pushw %gs /* %gs contains runtime %cs */
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- pushw $int19_entry
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- popl %es:( 0x19 * 4 )
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+ pushw $int18_entry
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+ popl %es:( 0x18 * 4 )
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jmp bbs_done
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-got_bbs: /* BBS compliant - no need to hook INT 19 */
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+got_bbs: /* BBS compliant - no need to hook INT 18 */
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movw $init_message_bbs, %si
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xorw %di, %di
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call print_message
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@@ -470,9 +468,9 @@
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init_message_pmm:
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.asciz " PMM"
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.size init_message_pmm, . - init_message_pmm
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-init_message_int19:
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- .asciz " INT19"
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- .size init_message_int19, . - init_message_int19
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+init_message_int18:
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+ .asciz " INT18"
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+ .size init_message_int18, . - init_message_int18
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init_message_prompt:
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.asciz "\nPress Ctrl-B to configure "
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.size init_message_prompt, . - init_message_prompt
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@@ -517,59 +515,30 @@
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lret
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.size bev_entry, . - bev_entry
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-/* INT19 entry point
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+/* INT18 entry point
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*
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- * Called via the hooked INT 19 if we detected a non-PnP BIOS. We
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- * attempt to return via the original INT 19 vector (if we were able
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- * to store it).
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+ * Called via the hooked INT 18 if we detected a non-PnP BIOS.
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+ * Use iret to return to firmware
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*/
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-int19_entry:
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- pushw %cs
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- popw %ds
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- /* Prompt user to press B to boot */
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- movw $int19_message_prompt, %si
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- xorw %di, %di
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- call print_message
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- movw $prodstr, %si
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- call print_message
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- movw $int19_message_dots, %si
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- call print_message
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- movw $0xdf4e, %bx
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- call wait_for_key
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- pushf
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- xorw %di, %di
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- call print_kill_line
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- movw $int19_message_done, %si
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- call print_message
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- popf
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- jz 1f
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- /* Leave keypress in buffer and start gPXE. The keypress will
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- * cause the usual initial Ctrl-B prompt to be skipped.
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- */
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+int18_entry:
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+ pushfl
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+ pushal
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+ pushw %gs
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+ pushw %fs
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+ pushw %es
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+ pushw %ds
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+
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pushw %cs
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call exec
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-1: /* Try to call original INT 19 vector */
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- movl %cs:orig_int19, %eax
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- testl %eax, %eax
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- je 2f
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- ljmp *%cs:orig_int19
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-2: /* No chained vector: issue INT 18 as a last resort */
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- int $0x18
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- .size int19_entry, . - int19_entry
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-orig_int19:
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- .long 0
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- .size orig_int19, . - orig_int19
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-int19_message_prompt:
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- .asciz "Press N to skip booting from "
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- .size int19_message_prompt, . - int19_message_prompt
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-int19_message_dots:
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- .asciz "..."
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- .size int19_message_dots, . - int19_message_dots
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-int19_message_done:
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- .asciz "\n\n"
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- .size int19_message_done, . - int19_message_done
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-
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+ popw %ds
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+ popw %es
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+ popw %fs
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+ popw %gs
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+ popal
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+ popfl
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+ iret
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+
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/* Execute as a boot device
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*
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*/
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