Changeset 2998046 in mainline

Timestamp:

2005-05-25T15:41:27Z (20 years ago)

Author:

Josef Cejka <malyzelenyhnus@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

fc9c4e1

Parents:

d5d2a3f

Message:

first version of e820 memmap

Location:

arch/ia32

Files:

• include/boot/memmap.h (modified) (1 diff)
• src/boot/memmap.S (modified) (2 diffs)

arch/ia32/include/boot/memmap.h

@@ -41 +41 @@
 #define MEMMAP_MEMORY_UNUSABLE  5 
 
-
+         /* size of one entry */
+#define MEMMAP_E820_RECORD_SIZE 20 
+        /* maximum entries */
+#define MEMMAP_E820_MAX_RECORDS 32 
 #endif

arch/ia32/src/boot/memmap.S

@@ -1 @@
-
+/*
+ * Copyright (C) 2005 Josef Cejka
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
 
 
@@ -9 +35 @@
 .section K_TEXT_START
 
+
+E820_RECORD_SIZE = MEMMAP_E820_RECORD_SIZE
+E820_MAX_RECORDS = MEMMAP_E820_MAX_RECORDS
+E820_SMAP = 0x534d4150
+
+.global memmap_arch_init
+
+.code16
+.section K_TEXT_START
+
 memmap_arch_init:
-    
-    ret
+        
+e820begin:
+        xorl    %ebx,%ebx       #at first call must be ebx==0
+        
+        movw    $e820table,%di
+        movb    $E820_MAX_RECORDS,(e820counter)
+e820loop:       
+        movl    $E820_SMAP,%edx         # constrol sequence "SMAP"
+        pushw   %ds
+        popw    %es             # e820 buffer address
+
+        movl    $0xe820,%eax            # service
+        movl    $E820_RECORD_SIZE,%ecx
+        int     $0x15
+        jc              e820end 
+        
+        
+        cmpl    $E820_SMAP,%eax         # verifiing BIOS
+        jne             e820end
+        
+        movw    %di,%ax         # next record
+        addw    $E820_RECORD_SIZE,%ax
+        movw    %ax,%di
+                
+        decb    (e820counter)
+        jnz             e820loop
+        
+e820end:
+        
+        movb    (e820counter),%al       
+        negb    %al
+        addb    $32,%al
+        movb    %al,(e820counter) # store # of valid entries in e820counter
+        
+        ret
+
+
+e820counter:
+        .byte 0
+                 
+e820table:
+        .space  (32*E820_RECORD_SIZE),0 #prostor na 32 zaznamu delky E820_RECORD_SIZE