178 lines
3.9 KiB
ArmAsm
178 lines
3.9 KiB
ArmAsm
/*
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* Copyright (C) 1994 by HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org>
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*
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* This software may be used, modified, copied, distributed, and sold,
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* in both source and binary form provided that the above copyright and
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* these terms are retained. Under no circumstances is the author
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* responsible for the proper functioning of this software, nor does
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* the author assume any responsibility for damages incurred with its
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* use.
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*
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* Sep., 1994 Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD)
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*
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* $Id$
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*/
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#include "apm.h"
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#if NAPM > 0
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#define ASSEMBLER
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#include "assym.s" /* system definitions */
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#include <machine/asmacros.h> /* miscellaneous asm macros */
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#include <machine/apm_bios.h>
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#include <machine/apm_segments.h>
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#define PADDR(addr) addr-KERNBASE
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.file "apm_setup.s"
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.data
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_apm_init_image:
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.globl _apm_init_image
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1:
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#include "i386/apm/apm_init/apm_init.inc"
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2:
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_apm_init_image_size:
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.globl _apm_init_image_size
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.long 2b - 1b
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_apm_version:
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.globl _apm_version
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.long 0
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_apm_cs_entry:
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.globl _apm_cs_entry
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.long 0
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_apm_cs16_base:
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.globl _apm_cs16_base
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.word 0
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_apm_cs32_base:
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.globl _apm_cs32_base
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.word 0
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_apm_ds_base:
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.globl _apm_ds_base
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.word 0
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_apm_cs_limit:
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.globl _apm_cs_limit
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.word 0
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_apm_ds_limit:
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.globl _apm_ds_limit
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.word 0
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_apm_flags:
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.globl _apm_flags
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.word 0
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.globl _apm_current_gdt_pdesc /* current GDT pseudo desc. */
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_apm_current_gdt_pdesc:
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.word 0, 0, 0
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.globl _bootstrap_gdt
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_bootstrap_gdt:
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.space SIZEOF_GDT*BOOTSTRAP_GDT_NUM
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.text
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_apm_setup:
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.globl _apm_setup
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/*
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* Setup APM BIOS:
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*
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* APM BIOS initialization should be done from real mode or V86 mode.
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*
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* (by HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp>)
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*/
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/*
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* Don't trust the value of %fs and %gs (some AT-compatible BIOS
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* implementations leave junk values in these segment registers
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* on bootstrap)
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*/
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xorl %eax, %eax /* null selector */
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movw %ax, %fs
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movw %ax, %gs
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/*
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* Copy APM initializer under 1MB boundary:
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*
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* APM initializer program must switch the CPU to real mode.
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* But FreeBSD kernel runs above 1MB boundary. So we must
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* copy the initializer code to conventional memory.
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*/
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movl PADDR(_apm_init_image_size), %ecx /* size */
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lea PADDR(_apm_init_image), %esi /* source */
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movl $ APM_OURADDR, %edi /* destination */
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cld
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rep
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movsb
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/* get GDT base */
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sgdt PADDR(_apm_current_gdt_pdesc)
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/* copy GDT to _bootstrap_gdt */
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xorl %ecx, %ecx
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movw PADDR(_apm_current_gdt_pdesc), %cx
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movl PADDR(_apm_current_gdt_pdesc + 2), %esi
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lea PADDR(_bootstrap_gdt), %edi
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cld
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rep
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movsb
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/* setup GDT pseudo descriptor */
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movw $(SIZEOF_GDT*BOOTSTRAP_GDT_NUM), %ax
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movw %ax, PADDR(_apm_current_gdt_pdesc)
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leal PADDR(_bootstrap_gdt), %eax
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movl %eax, PADDR(_apm_current_gdt_pdesc + 2)
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/* load new GDTR */
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lgdt PADDR(_apm_current_gdt_pdesc)
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/* setup GDT for APM initializer */
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lea PADDR(_bootstrap_gdt), %ecx
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movl $(APM_OURADDR), %eax /* use %ax for 15..0 */
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movl %eax, %ebx
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shrl $16, %ebx /* use %bl for 23..16 */
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/* use %bh for 31..24 */
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#define APM_SETUP_GDT(index, attrib) \
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movl $(index), %si ; \
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lea 0(%ecx,%esi,8), %edx ; \
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movw $0xffff, (%edx) ; \
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movw %ax, 2(%edx) ; \
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movb %bl, 4(%edx) ; \
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movw $(attrib), 5(%edx) ; \
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movb %bh, 7(%edx)
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APM_SETUP_GDT(APM_INIT_CS_INDEX , CS32_ATTRIB)
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APM_SETUP_GDT(APM_INIT_DS_INDEX , DS32_ATTRIB)
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APM_SETUP_GDT(APM_INIT_CS16_INDEX, CS16_ATTRIB)
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APM_SETUP_GDT(APM_INIT_DS16_INDEX, DS16_ATTRIB)
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/*
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* Call the initializer:
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*
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* direct intersegment call to conventional memory code
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*/
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.byte 0x9a /* actually, lcall $APM_INIT_CS_SEL, $0 */
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.long 0
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.word APM_INIT_CS_SEL
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movl %eax, PADDR(_apm_version)
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movl %ebx, PADDR(_apm_cs_entry)
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movw %cx, PADDR(_apm_cs16_base)
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shrl $16, %ecx
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movw %cx, PADDR(_apm_cs32_base)
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movw %dx, PADDR(_apm_ds_base)
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movw %si, PADDR(_apm_cs_limit)
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shrl $16, %esi
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movw %si, PADDR(_apm_ds_limit)
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movw %di, PADDR(_apm_flags)
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ret
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#endif NAPM > 0
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