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