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- /*
- * Copyright (C) 2008 Daniel Verkamp <daniel@drv.nu>.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
- */
-
- FILE_LICENCE ( GPL2_OR_LATER )
-
- .text
- .arch i386
- .code32
-
- /*
- * This code is entered after running the following sequence out of
- * the interrupt jump buffer:
- *
- * pushal
- * movb $vector, %al
- * jmp com32_irq_wrapper
- */
-
- .globl com32_irq_wrapper
- com32_irq_wrapper:
-
- movzbl %al,%eax
- pushl %eax
- movl $com32_irq, %eax
- call com32_wrapper
- popl %eax
- popal
- iret
-
- .globl com32_farcall_wrapper
- com32_farcall_wrapper:
-
- movl $com32_farcall, %eax
- jmp com32_wrapper
-
-
- .globl com32_cfarcall_wrapper
- com32_cfarcall_wrapper:
-
- movl $com32_cfarcall, %eax
- jmp com32_wrapper
-
-
- .globl com32_intcall_wrapper
- com32_intcall_wrapper:
-
- movl $com32_intcall, %eax
- /*jmp com32_wrapper*/ /* fall through */
-
- com32_wrapper:
- cli
-
- /* Switch to internal virtual address space */
- call _phys_to_virt
-
- /* Switch to internal IDT (if we have one for debugging) */
- lidt com32_internal_idtr
-
- mov %eax, (com32_helper_function)
-
- /* Save external COM32 stack pointer */
- movl %esp, (com32_external_esp)
-
- /* Copy arguments to caller-save registers */
- movl 12(%esp), %eax
- movl 8(%esp), %ecx
- movl 4(%esp), %edx
-
- /* Switch to internal stack */
- movl (com32_internal_esp), %esp
-
- /* Copy arguments to internal stack */
- pushl %eax
- pushl %ecx
- pushl %edx
-
- call *(com32_helper_function)
-
- /* Clean up stack */
- addl $12, %esp
-
- /* Save internal stack pointer and restore external stack pointer */
- movl %esp, (com32_internal_esp)
- movl (com32_external_esp), %esp
-
- /* Switch to com32 IDT */
- lidt com32_external_idtr
-
- /* Switch to external flat physical address space */
- call _virt_to_phys
-
- sti
- ret
-
-
- .data
-
- /* Internal iPXE virtual address space %esp */
- .globl com32_internal_esp
- .lcomm com32_internal_esp, 4
-
- /* External flat physical address space %esp */
- .globl com32_external_esp
- .lcomm com32_external_esp, 4
-
- /* Function pointer of helper to call */
- .lcomm com32_helper_function, 4
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