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[Qemu-devel] Re: [Bochs-developers] [PATCH v2 4/6] Execute rombios32 cod

From: Sebastian Herbszt
Subject: [Qemu-devel] Re: [Bochs-developers] [PATCH v2 4/6] Execute rombios32 code fromromaddress 0xe0000.
Date: Mon, 10 Nov 2008 20:25:07 +0100

Gleb Natapov wrote:
On Sat, Nov 08, 2008 at 12:20:56AM +0100, Sebastian Herbszt wrote:
diff --git a/bios/rombios32start.S b/bios/rombios32start.S
index 601e2b0..1900261 100644
--- a/bios/rombios32start.S
+++ b/bios/rombios32start.S
@@ -32,10 +32,17 @@ _start:
  /* clear bss section */
  xor %eax, %eax
  mov $__bss_start, %edi
-  mov $_end, %ecx
+  mov $__bss_end, %ecx
  sub %edi, %ecx
  rep stosb

We do overwrite data at 0x700 here. Is this acceptable for S3 resume?

First page is reserved for BIOS use.

I might have missed something, but Ralf Brown's MEMORY MAP
Release 61 says "MEM 0070h:0000h - DOS 2+ IO.SYS LOAD ADDRESS".

Which specification do you refer to?

- Sebastian

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