From patchwork Tue Sep 16 18:44:42 2008 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Herrenschmidt X-Patchwork-Id: 340 Return-Path: X-Original-To: patchwork@ozlabs.org Delivered-To: patchwork@ozlabs.org Received: from ozlabs.org (localhost [127.0.0.1]) by ozlabs.org (Postfix) with ESMTP id F197CDE945 for ; Wed, 17 Sep 2008 04:45:08 +1000 (EST) X-Original-To: linuxppc-dev@ozlabs.org Delivered-To: linuxppc-dev@ozlabs.org Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 422C9DDDD8 for ; Wed, 17 Sep 2008 04:44:49 +1000 (EST) Received: from [127.0.0.1] (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.13.8) with ESMTP id m8GIig1M006996; Tue, 16 Sep 2008 13:44:43 -0500 Subject: [PATCH] powerpc: Remove obsolete junk in Documentation/powerpc From: Benjamin Herrenschmidt To: Paul Mackerras Date: Tue, 16 Sep 2008 11:44:42 -0700 Message-Id: <1221590682.12463.46.camel@pasglop> Mime-Version: 1.0 X-Mailer: Evolution 2.22.3.1 Cc: linuxppc-dev list X-BeenThere: linuxppc-dev@ozlabs.org X-Mailman-Version: 2.1.11 Precedence: list Reply-To: benh@kernel.crashing.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linuxppc-dev-bounces+patchwork=ozlabs.org@ozlabs.org Errors-To: linuxppc-dev-bounces+patchwork=ozlabs.org@ozlabs.org We have all sort of totally rotten pieces of documentation in there, let's get rid of them Signed-off-by: Benjamin Herrenschmidt Index: linux-work/Documentation/powerpc/ppc_htab.txt =================================================================== --- linux-work.orig/Documentation/powerpc/ppc_htab.txt 2008-09-16 11:38:42.000000000 -0700 +++ /dev/null 1970-01-01 00:00:00.000000000 +0000 @@ -1,118 +0,0 @@ - Information about /proc/ppc_htab -===================================================================== - -This document and the related code was written by me (Cort Dougan), please -email me (cort@fsmlabs.com) if you have questions, comments or corrections. - -Last Change: 2.16.98 - -This entry in the proc directory is readable by all users but only -writable by root. - -The ppc_htab interface is a user level way of accessing the -performance monitoring registers as well as providing information -about the PTE hash table. - -1. Reading - - Reading this file will give you information about the memory management - hash table that serves as an extended tlb for page translation on the - powerpc. It will also give you information about performance measurement - specific to the cpu that you are using. - - Explanation of the 604 Performance Monitoring Fields: - MMCR0 - the current value of the MMCR0 register - PMC1 - PMC2 - the value of the performance counters and a - description of what events they are counting - which are based on MMCR0 bit settings. - Explanation of the PTE Hash Table fields: - - Size - hash table size in Kb. - Buckets - number of buckets in the table. - Address - the virtual kernel address of the hash table base. - Entries - the number of ptes that can be stored in the hash table. - User/Kernel - how many pte's are in use by the kernel or user at that time. - Overflows - How many of the entries are in their secondary hash location. - Percent full - ratio of free pte entries to in use entries. - Reloads - Count of how many hash table misses have occurred - that were fixed with a reload from the linux tables. - Should always be 0 on 603 based machines. - Non-error Misses - Count of how many hash table misses have occurred - that were completed with the creation of a pte in the linux - tables with a call to do_page_fault(). - Error Misses - Number of misses due to errors such as bad address - and permission violations. This includes kernel access of - bad user addresses that are fixed up by the trap handler. - - Note that calculation of the data displayed from /proc/ppc_htab takes - a long time and spends a great deal of time in the kernel. It would - be quite hard on performance to read this file constantly. In time - there may be a counter in the kernel that allows successive reads from - this file only after a given amount of time has passed to reduce the - possibility of a user slowing the system by reading this file. - -2. Writing - - Writing to the ppc_htab allows you to change the characteristics of - the powerpc PTE hash table and setup performance monitoring. - - Resizing the PTE hash table is not enabled right now due to many - complications with moving the hash table, rehashing the entries - and many many SMP issues that would have to be dealt with. - - Write options to ppc_htab: - - - To set the size of the hash table to 64Kb: - - echo 'size 64' > /proc/ppc_htab - - The size must be a multiple of 64 and must be greater than or equal to - 64. - - - To turn off performance monitoring: - - echo 'off' > /proc/ppc_htab - - - To reset the counters without changing what they're counting: - - echo 'reset' > /proc/ppc_htab - - Note that counting will continue after the reset if it is enabled. - - - To count only events in user mode or only in kernel mode: - - echo 'user' > /proc/ppc_htab - ...or... - echo 'kernel' > /proc/ppc_htab - - Note that these two options are exclusive of one another and the - lack of either of these options counts user and kernel. - Using 'reset' and 'off' reset these flags. - - - The 604 has 2 performance counters which can each count events from - a specific set of events. These sets are disjoint so it is not - possible to count _any_ combination of 2 events. One event can - be counted by PMC1 and one by PMC2. - - To start counting a particular event use: - - echo 'event' > /proc/ppc_htab - - and choose from these events: - - PMC1 - ---- - 'ic miss' - instruction cache misses - 'dtlb' - data tlb misses (not hash table misses) - - PMC2 - ---- - 'dc miss' - data cache misses - 'itlb' - instruction tlb misses (not hash table misses) - 'load miss time' - cycles to complete a load miss - -3. Bugs - - The PMC1 and PMC2 counters can overflow and give no indication of that - in /proc/ppc_htab. Index: linux-work/Documentation/powerpc/smp.txt =================================================================== --- linux-work.orig/Documentation/powerpc/smp.txt 2008-09-16 11:38:42.000000000 -0700 +++ /dev/null 1970-01-01 00:00:00.000000000 +0000 @@ -1,34 +0,0 @@ - Information about Linux/PPC SMP mode -===================================================================== - -This document and the related code was written by me -(Cort Dougan, cort@fsmlabs.com) please email me if you have questions, -comments or corrections. - -Last Change: 3.31.99 - -If you want to help by writing code or testing different hardware please -email me! - -1. State of Supported Hardware - - PowerSurge Architecture - tested on UMAX s900, Apple 9600 - The second processor on this machine boots up just fine and - enters its idle loop. Hopefully a completely working SMP kernel - on this machine will be done shortly. - - The code makes the assumption of only two processors. The changes - necessary to work with any number would not be overly difficult but - I don't have any machines with >2 processors so it's not high on my - list of priorities. If anyone else would like do to the work email - me and I can point out the places that need changed. If you have >2 - processors and don't want to add support yourself let me know and I - can take a look into it. - - BeBox - BeBox support hasn't been added to the 2.1.X kernels from 2.0.X - but work is being done and SMP support for BeBox is in the works. - - CHRP - CHRP SMP works and is fairly solid. It's been tested on the IBM F50 - with 4 processors for quite some time now. Index: linux-work/Documentation/powerpc/sound.txt =================================================================== --- linux-work.orig/Documentation/powerpc/sound.txt 2008-09-16 11:38:42.000000000 -0700 +++ /dev/null 1970-01-01 00:00:00.000000000 +0000 @@ -1,81 +0,0 @@ - Information about PowerPC Sound support -===================================================================== - -Please mail me (Cort Dougan, cort@fsmlabs.com) if you have questions, -comments or corrections. - -Last Change: 6.16.99 - -This just covers sound on the PReP and CHRP systems for now and later -will contain information on the PowerMac's. - -Sound on PReP has been tested and is working with the PowerStack and IBM -Power Series onboard sound systems which are based on the cs4231(2) chip. -The sound options when doing the make config are a bit different from -the default, though. - -The I/O base, irq and dma lines that you enter during the make config -are ignored and are set when booting according to the machine type. -This is so that one binary can be used for Motorola and IBM machines -which use different values and isn't allowed by the driver, so things -are hacked together in such a way as to allow this information to be -set automatically on boot. - -1. Motorola PowerStack PReP machines - - Enable support for "Crystal CS4232 based (PnP) cards" and for the - Microsoft Sound System. The MSS isn't used, but some of the routines - that the CS4232 driver uses are in it. - - Although the options you set are ignored and determined automatically - on boot these are included for information only: - - (830) CS4232 audio I/O base 530, 604, E80 or F40 - (10) CS4232 audio IRQ 5, 7, 9, 11, 12 or 15 - (6) CS4232 audio DMA 0, 1 or 3 - (7) CS4232 second (duplex) DMA 0, 1 or 3 - - This will allow simultaneous record and playback, as 2 different dma - channels are used. - - The sound will be all left channel and very low volume since the - auxiliary input isn't muted by default. I had the changes necessary - for this in the kernel but the sound driver maintainer didn't want - to include them since it wasn't common in other machines. To fix this - you need to mute it using a mixer utility of some sort (if you find one - please let me know) or by patching the driver yourself and recompiling. - - There is a problem on the PowerStack 2's (PowerStack Pro's) using a - different irq/drq than the kernel expects. Unfortunately, I don't know - which irq/drq it is so if anyone knows please email me. - - Midi is not supported since the cs4232 driver doesn't support midi yet. - -2. IBM PowerPersonal PReP machines - - I've only tested sound on the Power Personal Series of IBM workstations - so if you try it on others please let me know the result. I'm especially - interested in the 43p's sound system, which I know nothing about. - - Enable support for "Crystal CS4232 based (PnP) cards" and for the - Microsoft Sound System. The MSS isn't used, but some of the routines - that the CS4232 driver uses are in it. - - Although the options you set are ignored and determined automatically - on boot these are included for information only: - - (530) CS4232 audio I/O base 530, 604, E80 or F40 - (5) CS4232 audio IRQ 5, 7, 9, 11, 12 or 15 - (1) CS4232 audio DMA 0, 1 or 3 - (7) CS4232 second (duplex) DMA 0, 1 or 3 - (330) CS4232 MIDI I/O base 330, 370, 3B0 or 3F0 - (9) CS4232 MIDI IRQ 5, 7, 9, 11, 12 or 15 - - This setup does _NOT_ allow for recording yet. - - Midi is not supported since the cs4232 driver doesn't support midi yet. - -2. IBM CHRP - - I have only tested this on the 43P-150. Build the kernel with the cs4232 - set as a module and load the module with irq=9 dma=1 dma2=2 io=0x550 Index: linux-work/Documentation/powerpc/zImage_layout.txt =================================================================== --- linux-work.orig/Documentation/powerpc/zImage_layout.txt 2008-09-16 11:38:42.000000000 -0700 +++ /dev/null 1970-01-01 00:00:00.000000000 +0000 @@ -1,47 +0,0 @@ - Information about the Linux/PPC kernel images -===================================================================== - -Please mail me (Cort Dougan, cort@fsmlabs.com) if you have questions, -comments or corrections. - -This document is meant to answer several questions I've had about how -the PReP system boots and how Linux/PPC interacts with that mechanism. -It would be nice if we could have information on how other architectures -boot here as well. If you have anything to contribute, please -let me know. - - -1. PReP boot file - - This is the file necessary to boot PReP systems from floppy or - hard drive. The firmware reads the PReP partition table entry - and will load the image accordingly. - - To boot the zImage, copy it onto a floppy with dd if=zImage of=/dev/fd0h1440 - or onto a PReP hard drive partition with dd if=zImage of=/dev/sda4 - assuming you've created a PReP partition (type 0x41) with fdisk on - /dev/sda4. - - The layout of the image format is: - - 0x0 +------------+ - | | PReP partition table entry - | | - 0x400 +------------+ - | | Bootstrap program code + data - | | - | | - +------------+ - | | compressed kernel, elf header removed - +------------+ - | | initrd (if loaded) - +------------+ - | | Elf section table for bootstrap program - +------------+ - - -2. MBX boot file - - The MBX boards can load an elf image, and relocate it to the - proper location in memory - it copies the image to the location it was - linked at.