---

yaml --- r: 26561 b: refs/heads/master c: ac71d12 h: refs/heads/master i: 26559: 6db1b83 v: v3
git-mirror · May 8, 2006 · 882d12b · 882d12b
1 parent 32d9166
commit 882d12b
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Showing 4 changed files with 31 additions and 9 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8b1ffe9550e71224c43d8c754245bd76f4ea9bb8
+refs/heads/master: ac71d12c990526b01ef6cfe50907ef8530a30331
diff --git a/trunk/arch/x86_64/kernel/e820.c b/trunk/arch/x86_64/kernel/e820.c
@@ -76,6 +76,12 @@ static inline int bad_addr(unsigned long *addrp, unsigned long size)
 		*addrp = __pa_symbol(&_end);
 		return 1;
 	}
+
+	if (last >= ebda_addr && addr < ebda_addr + ebda_size) {
+		*addrp = ebda_addr + ebda_size;
+		return 1;
+	}
+
 	/* XXX ramdisk image here? */ 
 	return 0;
 } 

diff --git a/trunk/arch/x86_64/kernel/setup.c b/trunk/arch/x86_64/kernel/setup.c
@@ -571,17 +571,28 @@ static inline void copy_edd(void)
 #endif
 
 #define EBDA_ADDR_POINTER 0x40E
-static void __init reserve_ebda_region(void)
+
+unsigned __initdata ebda_addr;
+unsigned __initdata ebda_size;
+
+static void discover_ebda(void)
 {
-	unsigned int addr;
-	/** 
+	/*
 	 * there is a real-mode segmented pointer pointing to the 
 	 * 4K EBDA area at 0x40E
 	 */
-	addr = *(unsigned short *)phys_to_virt(EBDA_ADDR_POINTER);
-	addr <<= 4;
-	if (addr)
-		reserve_bootmem_generic(addr, PAGE_SIZE);
+	ebda_addr = *(unsigned short *)EBDA_ADDR_POINTER;
+	ebda_addr <<= 4;
+
+	ebda_size = *(unsigned short *)(unsigned long)ebda_addr;
+
+	/* Round EBDA up to pages */
+	if (ebda_size == 0)
+		ebda_size = 1;
+	ebda_size <<= 10;
+	ebda_size = round_up(ebda_size + (ebda_addr & ~PAGE_MASK), PAGE_SIZE);
+	if (ebda_size > 64*1024)
+		ebda_size = 64*1024;
 }
 
 void __init setup_arch(char **cmdline_p)
@@ -627,6 +638,8 @@ void __init setup_arch(char **cmdline_p)
 
 	check_efer();
 
+	discover_ebda();
+
 	init_memory_mapping(0, (end_pfn_map << PAGE_SHIFT));
 
 	dmi_scan_machine();
@@ -669,7 +682,8 @@ void __init setup_arch(char **cmdline_p)
 	reserve_bootmem_generic(0, PAGE_SIZE);
 
 	/* reserve ebda region */
-	reserve_ebda_region();
+	if (ebda_addr)
+		reserve_bootmem_generic(ebda_addr, ebda_size);
 
 #ifdef CONFIG_SMP
 	/*

diff --git a/trunk/include/asm-x86_64/e820.h b/trunk/include/asm-x86_64/e820.h
@@ -59,6 +59,8 @@ extern void __init parse_memopt(char *p, char **end);
 extern void __init parse_memmapopt(char *p, char **end);
 
 extern struct e820map e820;
+
+extern unsigned ebda_addr, ebda_size;
 #endif/*!__ASSEMBLY__*/
 
 #endif/*__E820_HEADER*/