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Date: Sun, 20 Apr 2008 03:34:37 -0700 From: "Yinghai Lu" <yhlu.kernel@...il.com> To: "Andres Salomon" <dilinger@...ued.net>, "H. Peter Anvin" <hpa@...or.com>, "Eric W. Biederman" <ebiederm@...ssion.com>, "Ingo Molnar" <mingo@...e.hu> Cc: "Andrew Morton" <akpm@...ux-foundation.org>, "Joseph Fannin" <jfannin@...il.com>, linux-kernel@...r.kernel.org, jordan.crouse@....com, "Mitch Bradley" <wmb@...mworks.com> Subject: Re: [PATCH 1/2] OLPC: Add support for calling into Open Firmware On Sat, Apr 19, 2008 at 10:39 AM, Andres Salomon <dilinger@...ued.net> wrote: > > This adds 32-bit support for calling into OFW from the kernel. It's useful > for querying the firmware for misc hardware information, fetching the device > tree, etc. > > There's potentially no reason why other platforms couldn't use this, but > currently OLPC is the main user of it. > > This work was originally done by Mitch Bradley. > > Signed-off-by: Andres Salomon <dilinger@...ian.org> > --- > arch/x86/Kconfig | 8 +++++ > arch/x86/kernel/Makefile | 1 + > arch/x86/kernel/head_32.S | 27 ++++++++++++++++ > arch/x86/kernel/ofw.c | 75 +++++++++++++++++++++++++++++++++++++++++++++ > include/asm-x86/ofw.h | 50 ++++++++++++++++++++++++++++++ > include/asm-x86/setup.h | 1 + > 6 files changed, 162 insertions(+), 0 deletions(-) > create mode 100644 arch/x86/kernel/ofw.c > create mode 100644 include/asm-x86/ofw.h > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index 3b9089b..ce56105 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -661,6 +661,14 @@ config I8K > Say Y if you intend to run this kernel on a Dell Inspiron 8000. > Say N otherwise. > > +config OPEN_FIRMWARE > + bool "Support for Open Firmware" > + default y if OLPC > + ---help--- > + This option adds support for the implementation of Open Firmware > + that is used on the OLPC XO laptop. > + If unsure, say N here. > + > config X86_REBOOTFIXUPS > def_bool n > prompt "Enable X86 board specific fixups for reboot" > diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile > index 9575754..d33600e 100644 > --- a/arch/x86/kernel/Makefile > +++ b/arch/x86/kernel/Makefile > @@ -54,6 +54,7 @@ obj-$(CONFIG_X86_TRAMPOLINE) += trampoline_$(BITS).o > obj-$(CONFIG_X86_MPPARSE) += mpparse_$(BITS).o > obj-$(CONFIG_X86_LOCAL_APIC) += apic_$(BITS).o nmi_$(BITS).o > obj-$(CONFIG_X86_IO_APIC) += io_apic_$(BITS).o > +obj-$(CONFIG_OPEN_FIRMWARE) += ofw.o > obj-$(CONFIG_X86_REBOOTFIXUPS) += reboot_fixups_32.o > obj-$(CONFIG_KEXEC) += machine_kexec_$(BITS).o > obj-$(CONFIG_KEXEC) += relocate_kernel_$(BITS).o crash.o > diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S > index 74d87ea..c9d2d00 100644 > --- a/arch/x86/kernel/head_32.S > +++ b/arch/x86/kernel/head_32.S > @@ -132,6 +132,33 @@ ENTRY(startup_32) > movsl > 1: > > +#ifdef CONFIG_OPEN_FIRMWARE > +/* > + * If Open Firmware booted us, save the OFW client interface callback address > + * and preserve the OFW page mappings by priming the kernel's new page > + * directory area with a copy of the OFW page directory. That lets OFW stay > + * resident in high memory (high in both the virtual and physical spaces) > + * for at least long enough to copy out the device tree. > + */ > + movl $pa(boot_params + OFW_INFO_OFFSET), %ebp > + cmpl $0x2057464F, (%ebp) /* Magic number "OFW " */ > + jne 4f > + > + mov 0x8(%ebp), %eax /* Save callback address */ > + mov %eax, pa(call_firmware) > + > + /* Copy the OFW pdir into swapper_pg_dir */ > + movl %esi, %edx /* save %esi */ > + movl $pa(swapper_pg_dir), %edi > + movl %cr3, %esi /* Source is current pg_dir base address */ > + movl $1024, %ecx /* Number of page directory entries */ > + rep > + movsl > + movl %edx, %esi /* restore %esi */ > +4: > + > +#endif > + > #ifdef CONFIG_PARAVIRT > /* This is can only trip for a broken bootloader... */ > cmpw $0x207, pa(boot_params + BP_version) > diff --git a/arch/x86/kernel/ofw.c b/arch/x86/kernel/ofw.c > new file mode 100644 > index 0000000..14036aa > --- /dev/null > +++ b/arch/x86/kernel/ofw.c > @@ -0,0 +1,75 @@ > +/* > + * Open Firmware client interface for 32-bit systems. > + * > + * Copyright (c) 2007 Mitch Bradley <wmb@...mworks.com> > + * Copyright (c) 2007-2008 Andres Salomon <dilinger@...ian.org> > + * > + * 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; either version 2 of the License, or > + * (at your option) any later version. > + */ > + > +#include <linux/kernel.h> > +#include <linux/spinlock.h> > +#include <linux/module.h> > +#include <asm/ofw.h> > + > +/* > + * This code is intended to be portable to any 32-bit Open Firmware > + * implementation with a standard client interface that can be > + * called when Linux is running. how about changing to ofw_32.c? 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