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[Qemu-devel] [Bug 995758] [NEW] Possibly inaccurate statement in PC Plat
From: |
Graham Cottrell |
Subject: |
[Qemu-devel] [Bug 995758] [NEW] Possibly inaccurate statement in PC Platform Docs |
Date: |
Mon, 07 May 2012 05:12:24 -0000 |
Public bug reported:
The documentation at:
http://wiki.qemu.org/Documentation/Platforms/PC
Contains the statement that the processor, after reset, executes code
starting from address 0xFFFFF, corresponding to the last byte of the
single megabyte of memory in the old 8086 address range.
>From my recollection of working in the microcomputer industry in the
late 1980's, execution actually starts in real mode at the start of the
last 16 bytes of addressable memory, at 0xFFFF0. Think about it - if
it's the last byte there's no room for an address operand to accompany a
1-byte opcode.
** Affects: qemu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/995758
Title:
Possibly inaccurate statement in PC Platform Docs
Status in QEMU:
New
Bug description:
The documentation at:
http://wiki.qemu.org/Documentation/Platforms/PC
Contains the statement that the processor, after reset, executes code
starting from address 0xFFFFF, corresponding to the last byte of the
single megabyte of memory in the old 8086 address range.
From my recollection of working in the microcomputer industry in the
late 1980's, execution actually starts in real mode at the start of
the last 16 bytes of addressable memory, at 0xFFFF0. Think about it -
if it's the last byte there's no room for an address operand to
accompany a 1-byte opcode.
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