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Use a log2 that has an author. 

Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Acked-by: Ronald G. Minnich <rminnich@gmail.com>
Acked-by: Stefan Reinauer <stepan@coresystems.de>



git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@112 f3766cd6-281f-0410-b1cd-43a5c92072e9
This commit is contained in:
Ronald G. Minnich 2007-02-25 10:02:11 +00:00
commit b9aa556977
2 changed files with 168 additions and 38 deletions
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127
doc/design/newboot.lyx
View file

@ -324,15 +324,6 @@ boot area
(C)
\end_layout
\begin_layout Subsection
Stage 2:
\end_layout
\begin_layout Standard
Note, currently at least part 1 of this is in the current stage 1 code ...
we need to figure this out.
\end_layout
\begin_layout Enumerate
Examine the flash.
Look in DTB option node, normal property for directory named by the boot
@ -351,6 +342,124 @@ In that directory, need 'initram', 'payload.ext', and others.
(C)
\end_layout
\begin_layout Subsection
Stage 2: Device tree
\end_layout
\begin_layout Standard
Run the standard device tree code.
This code runs in 6 phases.
\end_layout
\begin_layout Subparagraph*
Phase 1
\end_layout
\begin_layout Standard
These are any functions that are required to make printk operational.
No other code should be run in Phase 1.
\end_layout
\begin_layout Standard
Post codes:
\end_layout
\begin_layout Itemize
Entry: 0x20
\end_layout
\begin_layout Itemize
Exit: 0x2f
\end_layout
\begin_layout Subparagraph*
Phase 2
\end_layout
\begin_layout Standard
These are functions that are required before any PCI operations of any kind
are run.
\end_layout
\begin_layout Subparagraph*
Post codes:
\end_layout
\begin_layout Itemize
Entry: 0x30
\end_layout
\begin_layout Itemize
Exit: 0x3f
\end_layout
\begin_layout Subparagraph*
Phase 3
\end_layout
\begin_layout Subparagraph*
Post codes:
\end_layout
\begin_layout Itemize
Entry: 0x40
\end_layout
\begin_layout Itemize
Exit: 0x4f
\end_layout
\begin_layout Subparagraph*
Phase 4
\end_layout
\begin_layout Subparagraph*
Post codes:
\end_layout
\begin_layout Itemize
Entry: 0x50
\end_layout
\begin_layout Itemize
Exit: 0x5f
\end_layout
\begin_layout Subparagraph*
Phase 5
\end_layout
\begin_layout Subparagraph*
Post codes:
\end_layout
\begin_layout Itemize
Entry: 0x60
\end_layout
\begin_layout Itemize
Exit: 0x6f
\end_layout
\begin_layout Subparagraph*
Phase 6
\end_layout
\begin_layout Standard
Post codes:
\end_layout
\begin_layout Itemize
Entry: 0x70
\end_layout
\begin_layout Itemize
Exit: 0x7f
\end_layout
\begin_layout Subsection
Stage 3: elf boot
\end_layout

79
lib/clog2.c
View file

@ -1,39 +1,60 @@
/*
* clog2 -- get a log2 in C.
*
/* log 2 in c, from mozilla, from jscpucfg.c */
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* Author(s) unknown, but this classic code was found by
* Ronald G. Minnich somewhere.
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
*/
* Contributor(s):
* Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* Assume 8 bits per byte */
#define CHAR_BIT 8
unsigned long log2(unsigned long x)
int log2(unsigned int n)
{
unsigned long i = 1ULL << (sizeof(x)* CHAR_BIT - 1ULL);
unsigned long pow = sizeof(x) * CHAR_BIT - 1ULL;
int log2 = 0;
if (! x) {
return -1;
}
for(; i > x; i >>= 1, pow--)
;
return pow;
if (n & (n-1))
log2++;
if (n >> 16)
log2 += 16, n >>= 16;
if (n >> 8)
log2 += 8, n >>= 8;
if (n >> 4)
log2 += 4, n >>= 4;
if (n >> 2)
log2 += 2, n >>= 2;
if (n >> 1)
log2++;
return log2;
}