[tkreuzer] 52329: [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
18 Jun
2011
18 Jun
'11
10:46 a.m.
Author: tkreuzer
Date: Sat Jun 18 10:46:06 2011
New Revision: 52329
URL: http://svn.reactos.org/svn/reactos?rev=52329&view=rev
Log:
[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
Added:
trunk/reactos/boot/freeldr/freeldr/arch/i386/linux.cmake.S (with props)
trunk/reactos/boot/freeldr/freeldr/arch/realmode/linux.inc
Modified:
trunk/reactos/boot/freeldr/freeldr/CMakeLists.txt
trunk/reactos/boot/freeldr/freeldr/arch/i386/entry.S
trunk/reactos/boot/freeldr/freeldr/arch/i386/multiboot.S
trunk/reactos/boot/freeldr/freeldr/arch/realmode/i386.S
trunk/reactos/boot/freeldr/freeldr/include/arch/pc/x86common.h
Modified: trunk/reactos/boot/freeldr/freeldr/CMakeLists.txt
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/boot/freeldr/freeldr/CMake…
==============================================================================
--- trunk/reactos/boot/freeldr/freeldr/CMakeLists.txt [iso-8859-1] (original)
+++ trunk/reactos/boot/freeldr/freeldr/CMakeLists.txt [iso-8859-1] Sat Jun 18 10:46:06
2011
@@ -15,11 +15,11 @@
arch/i386/i386trap.S
arch/i386/i386pnp.cmake.S
arch/i386/i386bug.c
+ arch/i386/linux.cmake.S
arch/i386/mb.S)
if(NOT MSVC)
list(APPEND FREELDR_BASE64K_SOURCE
arch/i386/drvmap.S
- arch/i386/linux.S
arch/i386/multiboot.S)
else()
list(APPEND FREELDR_BASE64K_SOURCE
Modified: trunk/reactos/boot/freeldr/freeldr/arch/i386/entry.S
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/boot/freeldr/freeldr/arch/…
==============================================================================
--- trunk/reactos/boot/freeldr/freeldr/arch/i386/entry.S [iso-8859-1] (original)
+++ trunk/reactos/boot/freeldr/freeldr/arch/i386/entry.S [iso-8859-1] Sat Jun 18 10:46:06
2011
@@ -82,151 +82,6 @@
nop
nop
-#ifndef _USE_ML
-/*
- * Switches the processor to protected mode
- * it destroys eax
- */
-EXTERN(switch_to_prot)
-
-.code16
-
- cli /* None of these */
-
- /* We don't know what values are currently */
- /* in the segment registers. So we are */
- /* going to reload them with sane values. */
- /* Of course CS has to already be valid. */
- /* We are currently in real-mode so we */
- /* need real-mode segment values. */
- xor ax, ax
- mov ds, ax
- mov es, ax
- mov fs, ax
- mov gs, ax
- mov ss, ax
-
- /* Get the return address off the stack */
- pop word ptr ds:[code32ret]
-
- /* Save 16-bit stack pointer */
- mov word ptr ds:[stack16], sp
-
- /* Load the GDT */
- lgdt gdtptr
-
- /* Load the IDT */
- lidt i386idtptr
-
- /* Enable Protected Mode */
- mov eax, cr0
- or eax, CR0_PE_SET
- mov cr0, eax
-
- /* Clear prefetch queue & correct CS */
- //ljmp PMODE_CS, inpmode
- jmp far ptr PMODE_CS:inpmode
-
-.code32
-
-inpmode:
- /* Setup segment selectors */
- mov ax, PMODE_DS
- mov ds, ax
- mov es, ax
- mov fs, ax
- mov gs, ax
- mov ss, ax
- mov esp, dword ptr [stack32]
-
- /* Put the return address back onto the stack */
- push dword ptr [code32ret]
-
- /* Now return in p-mode! */
- ret
-
-/*
- * Switches the processor back to real mode
- * it destroys eax
- */
-EXTERN(switch_to_real)
-
-.code32
-
- /* We don't know what values are currently */
- /* in the segment registers. So we are */
- /* going to reload them with sane values. */
- /* Of course CS has to already be valid. */
- /* We are currently in protected-mode so we */
- /* need protected-mode segment values. */
- mov ax, PMODE_DS
- mov ds, ax
- mov es, ax
- mov fs, ax
- mov gs, ax
- mov ss, ax
-
- /* Get the return address off the stack */
- pop dword ptr [code16ret]
-
- /* Save 32-bit stack pointer */
- mov dword ptr [stack32], esp
-
- /* jmp to 16-bit segment to set the limit correctly */
- ljmp RMODE_CS, switch_to_real16
-
-switch_to_real16:
-.code16
-
- /* Restore segment registers to correct limit */
- mov ax, RMODE_DS
- mov ds, ax
- mov es, ax
- mov fs, ax
- mov gs, ax
- mov ss, ax
-
- /* Disable Protected Mode */
- mov eax, cr0
- and eax, CR0_PE_CLR
- mov cr0, eax
-
- /* Clear prefetch queue & correct CS */
- //ljmp $0, $inrmode
- jmp far ptr 0:inrmode
-
-inrmode:
- mov ax, cs
- mov ds, ax
- mov es, ax
- mov fs, ax
- mov gs, ax
- mov ss, ax
-
- /* Clear out the high 16-bits of ESP */
- /* This is needed because I have one */
- /* machine that hangs when booted to dos if */
- /* anything other than 0x0000 is in the high */
- /* 16-bits of ESP. Even though real-mode */
- /* code should only use SP and not ESP. */
- xor esp, esp
-
- mov sp, word ptr ds:[stack16]
-
- /* Put the return address back onto the stack */
- push word ptr ds:[code16ret]
-
- /* Load IDTR with real mode value */
- lidt rmode_idtptr
-
- sti /* These are ok now */
-
- /* Now return in r-mode! */
- ret
-#endif
-
-.code32
-
Int386_regsin:
.long 0
Int386_regsout:
@@ -390,15 +245,6 @@
stack32:
.long STACK32ADDR
- /* 16-bit return address */
-code16ret:
- .long 0
-
- /* 32-bit return address */
-code32ret:
- .long 0
-
-
.align 4 /* force 4-byte alignment */
gdt:
/* NULL Descriptor */
Added: trunk/reactos/boot/freeldr/freeldr/arch/i386/linux.cmake.S
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/boot/freeldr/freeldr/arch/…
==============================================================================
--- trunk/reactos/boot/freeldr/freeldr/arch/i386/linux.cmake.S (added)
+++ trunk/reactos/boot/freeldr/freeldr/arch/i386/linux.cmake.S [iso-8859-1] Sat Jun 18
10:46:06 2011
@@ -1,0 +1,53 @@
+/*
+ * FreeLoader
+ * Copyright (C) 1998-2002 Brian Palmer <brianp(a)sginet.com>
+ *
+ * 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
+ * (at your option) 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.
+ */
+
+#include <asm.inc>
+#include <arch/pc/x86common.h>
+
+.code32
+
+/*
+ * VOID BootOldLinuxKernel(ULONG KernelSize);
+ */
+PUBLIC _BootOldLinuxKernel
+_BootOldLinuxKernel:
+
+ /* First we have to copy the kernel down from 0x100000 to 0x10000 */
+ /* The reason we can overwrite low memory is because this code */
+ /* executes between 0000:8000 and 0000:FFFF. That leaves space for */
+ /* 32k of code before we start interfering with Linux kernel address space. */
+
+ /* Get KernelSize in ECX and move the kernel down */
+ mov ecx, [esp + 4]
+ mov esi, HEX(100000)
+ mov edi, HEX(10000)
+ rep movsb
+
+ /* Fall through */
+
+PUBLIC _BootNewLinuxKernel
+_BootNewLinuxKernel:
+
+ mov bx, FNID_BootLinuxKernel
+ call i386CallRealMode
+
+ /* We should never get here */
+ int 3
+
+END
Propchange: trunk/reactos/boot/freeldr/freeldr/arch/i386/linux.cmake.S
------------------------------------------------------------------------------
svn:eol-style = native
Modified: trunk/reactos/boot/freeldr/freeldr/arch/i386/multiboot.S
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/boot/freeldr/freeldr/arch/…
==============================================================================
--- trunk/reactos/boot/freeldr/freeldr/arch/i386/multiboot.S [iso-8859-1] (original)
+++ trunk/reactos/boot/freeldr/freeldr/arch/i386/multiboot.S [iso-8859-1] Sat Jun 18
10:46:06 2011
@@ -163,9 +163,7 @@
call _BootMain
mbfail:
- call switch_to_real
- .code16
- int 0x19
+ int 3
mbstop: jmp mbstop /* We should never get here */
mb_info:
Modified: trunk/reactos/boot/freeldr/freeldr/arch/realmode/i386.S
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/boot/freeldr/freeldr/arch/…
==============================================================================
--- trunk/reactos/boot/freeldr/freeldr/arch/realmode/i386.S [iso-8859-1] (original)
+++ trunk/reactos/boot/freeldr/freeldr/arch/realmode/i386.S [iso-8859-1] Sat Jun 18
10:46:06 2011
@@ -139,6 +139,7 @@
.word PxeCallApi
.word PnpBiosGetDeviceNodeCount
.word PnpBiosGetDeviceNode
+ .word BootLinuxKernel
/* 16-bit stack pointer */
@@ -191,6 +192,7 @@
#include "int386.inc"
#include "pxe.inc"
#include "pnp.inc"
+#include "linux.inc"
#include "helpers.inc"
.org (FREELDR_PE_BASE - FREELDR_BASE - 1)
Added: trunk/reactos/boot/freeldr/freeldr/arch/realmode/linux.inc
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/boot/freeldr/freeldr/arch/…
==============================================================================
--- trunk/reactos/boot/freeldr/freeldr/arch/realmode/linux.inc (added)
+++ trunk/reactos/boot/freeldr/freeldr/arch/realmode/linux.inc [iso-8859-1] Sat Jun 18
10:46:06 2011
@@ -1,0 +1,16 @@
+
+
+BootLinuxKernel:
+ // dl must be set to the boot drive
+
+ /* Load segment registers */
+ cli
+ mov bx, HEX(9000)
+ mov ds, bx
+ mov es, bx
+ mov fs, bx
+ mov gs, bx
+ mov ss, bx
+ mov sp, HEX(9000)
+
+ ljmp16 HEX(9020), HEX(0000)
Modified: trunk/reactos/boot/freeldr/freeldr/include/arch/pc/x86common.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/boot/freeldr/freeldr/inclu…
==============================================================================
--- trunk/reactos/boot/freeldr/freeldr/include/arch/pc/x86common.h [iso-8859-1]
(original)
+++ trunk/reactos/boot/freeldr/freeldr/include/arch/pc/x86common.h [iso-8859-1] Sat Jun 18
10:46:06 2011
@@ -49,6 +49,7 @@
#define FNID_PxeCallApi 3
#define FNID_PnpBiosGetDeviceNodeCount 4
#define FNID_PnpBiosGetDeviceNode 5
+#define FNID_BootLinuxKernel 6
/* Layout of the REGS structure */
#define REGS_EAX 0
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