From 26d83dcf4ae19cb4b9256d9a3e2134c64133b1bc Mon Sep 17 00:00:00 2001
From: "Evgeny Grechnikov (Diamond)" <diamondz@land.ru>
Date: Tue, 22 Sep 2009 17:10:24 +0000
Subject: [PATCH] keep physical page 0 intact (used by some BIOSes in int 13h)

git-svn-id: svn://kolibrios.org@1172 a494cfbc-eb01-0410-851d-a64ba20cac60
---
 kernel/trunk/const.inc  | 4 ++--
 kernel/trunk/kernel.asm | 4 ++--
 kernel/trunk/memmap.inc | 7 ++++---
 3 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/kernel/trunk/const.inc b/kernel/trunk/const.inc
index 10be1bf82a..957d5a5820 100644
--- a/kernel/trunk/const.inc
+++ b/kernel/trunk/const.inc
@@ -186,7 +186,7 @@ TSS_SIZE  equ (128+8192)
 
 OS_BASE             equ 0x80000000
 
-window_data         equ OS_BASE
+window_data         equ (OS_BASE+0x0001000)
 
 CURRENT_TASK        equ (OS_BASE+0x0003000)
 TASK_COUNT          equ (OS_BASE+0x0003004)
@@ -331,7 +331,7 @@ LFB_BASE            equ 0xFE000000
 
 new_app_base        equ 0;
 
-twdw                equ 0x3000   ;(CURRENT_TASK-window_data)
+twdw                equ 0x2000   ;(CURRENT_TASK-window_data)
 
 std_application_base_address   equ new_app_base
 RING0_STACK_SIZE    equ (0x2000 - 512)    ;512 байт для контекста FPU
diff --git a/kernel/trunk/kernel.asm b/kernel/trunk/kernel.asm
index da42000459..711eb18a71 100644
--- a/kernel/trunk/kernel.asm
+++ b/kernel/trunk/kernel.asm
@@ -238,8 +238,8 @@ B32:
            mov   edi,0x2F0000
            mov   ecx,0x10000 / 4
            rep   movsd
-           xor edi, edi
-           mov   ecx,0x10000 / 4
+           mov   edi,0x1000
+           mov   ecx,0xf000 / 4
            rep   stosd
 
            call test_cpu
diff --git a/kernel/trunk/memmap.inc b/kernel/trunk/memmap.inc
index 66623229e2..e54718c0f5 100644
--- a/kernel/trunk/memmap.inc
+++ b/kernel/trunk/memmap.inc
@@ -30,7 +30,10 @@
 ;
 ; 0x00000000 -> 0x7FFFFFFF  application 2Gb
 
-; 0x80000000 -> 1FFF   window_data   - 256 entries
+; 0x80000000 -> 0FFF  physical page zero - do not write
+;                     (used by int 13h in some configurations)
+;
+; 0x80001000 -> 2FFF   window_data   - 256 entries
 ;
 ;         0000 dword  x start
 ;         0004 dword  y start
@@ -41,8 +44,6 @@
 ;         0018 dword  color of frames
 ;         001C dword  window flags, +30 = window drawn, +31 redraw flag
 ;
-;   2000  ->   2FFF   free
-;
 ;   3000  ->   4FFF   task list      - 256 entries
 ;
 ;         00   dword  process count