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https://github.com/reactos/reactos.git
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[FREELDR]
- Convert Boot*LinuxKernel to new realmode call mechanism - Remove switch to realmode when multiboot fails - remove switch_to_prot and switch_to_real completely svn path=/trunk/; revision=52329
This commit is contained in:
Timo Kreuzer
parent
014e413e00
commit
b6ca5be6b4
7 changed files with 74 additions and 158 deletions
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@ -15,11 +15,11 @@ if(ARCH MATCHES i386)
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arch/i386/i386trap.S
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arch/i386/i386pnp.cmake.S
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arch/i386/i386bug.c
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arch/i386/linux.cmake.S
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arch/i386/mb.S)
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if(NOT MSVC)
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list(APPEND FREELDR_BASE64K_SOURCE
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arch/i386/drvmap.S
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arch/i386/linux.S
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arch/i386/multiboot.S)
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else()
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list(APPEND FREELDR_BASE64K_SOURCE
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@ -82,151 +82,6 @@ stop:
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nop
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nop
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#ifndef _USE_ML
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/*
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* Switches the processor to protected mode
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* it destroys eax
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*/
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EXTERN(switch_to_prot)
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.code16
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cli /* None of these */
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/* We don't know what values are currently */
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/* in the segment registers. So we are */
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/* going to reload them with sane values. */
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/* Of course CS has to already be valid. */
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/* We are currently in real-mode so we */
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/* need real-mode segment values. */
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xor ax, ax
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov ss, ax
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/* Get the return address off the stack */
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pop word ptr ds:[code32ret]
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/* Save 16-bit stack pointer */
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mov word ptr ds:[stack16], sp
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/* Load the GDT */
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lgdt gdtptr
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/* Load the IDT */
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lidt i386idtptr
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/* Enable Protected Mode */
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mov eax, cr0
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or eax, CR0_PE_SET
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mov cr0, eax
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/* Clear prefetch queue & correct CS */
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//ljmp PMODE_CS, inpmode
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jmp far ptr PMODE_CS:inpmode
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.code32
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inpmode:
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/* Setup segment selectors */
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mov ax, PMODE_DS
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov ss, ax
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mov esp, dword ptr [stack32]
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/* Put the return address back onto the stack */
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push dword ptr [code32ret]
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/* Now return in p-mode! */
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ret
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/*
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* Switches the processor back to real mode
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* it destroys eax
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*/
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EXTERN(switch_to_real)
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.code32
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/* We don't know what values are currently */
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/* in the segment registers. So we are */
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/* going to reload them with sane values. */
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/* Of course CS has to already be valid. */
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/* We are currently in protected-mode so we */
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/* need protected-mode segment values. */
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mov ax, PMODE_DS
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov ss, ax
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/* Get the return address off the stack */
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pop dword ptr [code16ret]
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/* Save 32-bit stack pointer */
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mov dword ptr [stack32], esp
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/* jmp to 16-bit segment to set the limit correctly */
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ljmp RMODE_CS, switch_to_real16
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switch_to_real16:
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.code16
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/* Restore segment registers to correct limit */
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mov ax, RMODE_DS
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov ss, ax
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/* Disable Protected Mode */
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mov eax, cr0
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and eax, CR0_PE_CLR
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mov cr0, eax
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/* Clear prefetch queue & correct CS */
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//ljmp $0, $inrmode
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jmp far ptr 0:inrmode
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inrmode:
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mov ax, cs
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov ss, ax
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/* Clear out the high 16-bits of ESP */
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/* This is needed because I have one */
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/* machine that hangs when booted to dos if */
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/* anything other than 0x0000 is in the high */
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/* 16-bits of ESP. Even though real-mode */
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/* code should only use SP and not ESP. */
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xor esp, esp
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mov sp, word ptr ds:[stack16]
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/* Put the return address back onto the stack */
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push word ptr ds:[code16ret]
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/* Load IDTR with real mode value */
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lidt rmode_idtptr
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sti /* These are ok now */
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/* Now return in r-mode! */
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ret
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#endif
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.code32
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Int386_regsin:
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.long 0
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Int386_regsout:
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@ -390,15 +245,6 @@ stack16:
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stack32:
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.long STACK32ADDR
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/* 16-bit return address */
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code16ret:
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.long 0
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/* 32-bit return address */
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code32ret:
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.long 0
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.align 4 /* force 4-byte alignment */
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gdt:
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/* NULL Descriptor */
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53
reactos/boot/freeldr/freeldr/arch/i386/linux.cmake.S
Normal file
53
reactos/boot/freeldr/freeldr/arch/i386/linux.cmake.S
Normal file
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@ -0,0 +1,53 @@
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/*
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* FreeLoader
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* Copyright (C) 1998-2002 Brian Palmer <brianp@sginet.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <asm.inc>
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#include <arch/pc/x86common.h>
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.code32
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/*
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* VOID BootOldLinuxKernel(ULONG KernelSize);
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*/
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PUBLIC _BootOldLinuxKernel
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_BootOldLinuxKernel:
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/* First we have to copy the kernel down from 0x100000 to 0x10000 */
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/* The reason we can overwrite low memory is because this code */
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/* executes between 0000:8000 and 0000:FFFF. That leaves space for */
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/* 32k of code before we start interfering with Linux kernel address space. */
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/* Get KernelSize in ECX and move the kernel down */
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mov ecx, [esp + 4]
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mov esi, HEX(100000)
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mov edi, HEX(10000)
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rep movsb
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/* Fall through */
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PUBLIC _BootNewLinuxKernel
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_BootNewLinuxKernel:
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mov bx, FNID_BootLinuxKernel
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call i386CallRealMode
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/* We should never get here */
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int 3
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END
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@ -163,9 +163,7 @@ mb7:
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call _BootMain
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mbfail:
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call switch_to_real
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.code16
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int 0x19
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int 3
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mbstop: jmp mbstop /* We should never get here */
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mb_info:
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@ -139,6 +139,7 @@ callback_table:
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.word PxeCallApi
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.word PnpBiosGetDeviceNodeCount
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.word PnpBiosGetDeviceNode
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.word BootLinuxKernel
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/* 16-bit stack pointer */
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@ -191,6 +192,7 @@ rmode_idtptr:
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#include "int386.inc"
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#include "pxe.inc"
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#include "pnp.inc"
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#include "linux.inc"
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#include "helpers.inc"
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.org (FREELDR_PE_BASE - FREELDR_BASE - 1)
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16
reactos/boot/freeldr/freeldr/arch/realmode/linux.inc
Normal file
16
reactos/boot/freeldr/freeldr/arch/realmode/linux.inc
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@ -0,0 +1,16 @@
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BootLinuxKernel:
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// dl must be set to the boot drive
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/* Load segment registers */
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cli
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mov bx, HEX(9000)
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mov ds, bx
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mov es, bx
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mov fs, bx
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mov gs, bx
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mov ss, bx
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mov sp, HEX(9000)
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ljmp16 HEX(9020), HEX(0000)
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@ -49,6 +49,7 @@
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#define FNID_PxeCallApi 3
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#define FNID_PnpBiosGetDeviceNodeCount 4
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#define FNID_PnpBiosGetDeviceNode 5
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#define FNID_BootLinuxKernel 6
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/* Layout of the REGS structure */
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#define REGS_EAX 0
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