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Date: Sun, 20 Apr 2008 17:09:54 -1000 From: Mitch Bradley <wmb@...mworks.com> To: Yinghai Lu <yhlu.kernel@...il.com> CC: Andres Salomon <dilinger@...ued.net>, "H. Peter Anvin" <hpa@...or.com>, "Eric W. Biederman" <ebiederm@...ssion.com>, Ingo Molnar <mingo@...e.hu>, Andrew Morton <akpm@...ux-foundation.org>, Joseph Fannin <jfannin@...il.com>, linux-kernel@...r.kernel.org, jordan.crouse@....com Subject: Re: [PATCH 1/2] OLPC: Add support for calling into Open Firmware Yinghai Lu wrote: > 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? > > YH > Is your suggestion to change the filename from "ofw.c" to "ofw_32.c"? That seems like a good idea to me. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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