2005-04-17 06:20:36 +08:00
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/*
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* fixmap.h: compile-time virtual memory allocation
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1998 Ingo Molnar
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*/
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2008-04-26 00:25:25 +08:00
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#ifndef _ASM_FIXMAP_64_H
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#define _ASM_FIXMAP_64_H
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2005-04-17 06:20:36 +08:00
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#include <linux/kernel.h>
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2008-07-10 11:16:36 +08:00
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#include <asm/acpi.h>
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2005-04-17 06:20:36 +08:00
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#include <asm/apicdef.h>
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#include <asm/page.h>
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#include <asm/vsyscall.h>
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2008-01-30 20:31:19 +08:00
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#include <asm/efi.h>
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2005-04-17 06:20:36 +08:00
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/*
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* Here we define all the compile-time 'special' virtual
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* addresses. The point is to have a constant address at
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* compile time, but to set the physical address only
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* in the boot process.
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*
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2007-07-21 23:11:21 +08:00
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* These 'compile-time allocated' memory buffers are
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* fixed-size 4k pages (or larger if used with an increment
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* higher than 1). Use set_fixmap(idx,phys) to associate
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2005-04-17 06:20:36 +08:00
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* physical memory with fixmap indices.
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*
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* TLB entries of such buffers will not be flushed across
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* task switches.
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*/
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enum fixed_addresses {
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VSYSCALL_LAST_PAGE,
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2008-03-23 16:02:10 +08:00
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VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE
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+ ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1,
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2005-04-17 06:20:36 +08:00
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VSYSCALL_HPET,
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serial: convert early_uart to earlycon for 8250
Beacuse SERIAL_PORT_DFNS is removed from include/asm-i386/serial.h and
include/asm-x86_64/serial.h. the serial8250_ports need to be probed late in
serial initializing stage. the console_init=>serial8250_console_init=>
register_console=>serial8250_console_setup will return -ENDEV, and console
ttyS0 can not be enabled at that time. need to wait till uart_add_one_port in
drivers/serial/serial_core.c to call register_console to get console ttyS0.
that is too late.
Make early_uart to use early_param, so uart console can be used earlier. Make
it to be bootconsole with CON_BOOT flag, so can use console handover feature.
and it will switch to corresponding normal serial console automatically.
new command line will be:
console=uart8250,io,0x3f8,9600n8
console=uart8250,mmio,0xff5e0000,115200n8
or
earlycon=uart8250,io,0x3f8,9600n8
earlycon=uart8250,mmio,0xff5e0000,115200n8
it will print in very early stage:
Early serial console at I/O port 0x3f8 (options '9600n8')
console [uart0] enabled
later for console it will print:
console handover: boot [uart0] -> real [ttyS0]
Signed-off-by: <yinghai.lu@sun.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Gerd Hoffmann <kraxel@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-16 14:37:59 +08:00
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FIX_DBGP_BASE,
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FIX_EARLYCON_MEM_BASE,
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2005-04-17 06:20:36 +08:00
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FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
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FIX_IO_APIC_BASE_0,
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2008-03-23 16:02:10 +08:00
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FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
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2008-01-30 20:31:19 +08:00
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FIX_EFI_IO_MAP_LAST_PAGE,
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2008-03-23 16:02:10 +08:00
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FIX_EFI_IO_MAP_FIRST_PAGE = FIX_EFI_IO_MAP_LAST_PAGE
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+ MAX_EFI_IO_PAGES - 1,
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2008-06-25 12:19:17 +08:00
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#ifdef CONFIG_PARAVIRT
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FIX_PARAVIRT_BOOTMAP,
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#endif
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2008-07-10 11:16:36 +08:00
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#ifdef CONFIG_ACPI
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FIX_ACPI_BEGIN,
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FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
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#endif
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x86: early boot debugging via FireWire (ohci1394_dma=early)
This patch adds a new configuration option, which adds support for a new
early_param which gets checked in arch/x86/kernel/setup_{32,64}.c:setup_arch()
to decide wether OHCI-1394 FireWire controllers should be initialized and
enabled for physical DMA access to allow remote debugging of early problems
like issues ACPI or other subsystems which are executed very early.
If the config option is not enabled, no code is changed, and if the boot
paramenter is not given, no new code is executed, and independent of that,
all new code is freed after boot, so the config option can be even enabled
in standard, non-debug kernels.
With specialized tools, it is then possible to get debugging information
from machines which have no serial ports (notebooks) such as the printk
buffer contents, or any data which can be referenced from global pointers,
if it is stored below the 4GB limit and even memory dumps of of the physical
RAM region below the 4GB limit can be taken without any cooperation from the
CPU of the host, so the machine can be crashed early, it does not matter.
In the extreme, even kernel debuggers can be accessed in this way. I wrote
a small kgdb module and an accompanying gdb stub for FireWire which allows
to gdb to talk to kgdb using remote remory reads and writes over FireWire.
An version of the gdb stub fore FireWire is able to read all global data
from a system which is running a a normal kernel without any kernel debugger,
without any interruption or support of the system's CPU. That way, e.g. the
task struct and so on can be read and even manipulated when the physical DMA
access is granted.
A HOWTO is included in this patch, in Documentation/debugging-via-ohci1394.txt
and I've put a copy online at
ftp://ftp.suse.de/private/bk/firewire/docs/debugging-via-ohci1394.txt
It also has links to all the tools which are available to make use of it
another copy of it is online at:
ftp://ftp.suse.de/private/bk/firewire/kernel/ohci1394_dma_early-v2.diff
Signed-Off-By: Bernhard Kaindl <bk@suse.de>
Tested-By: Thomas Renninger <trenn@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 20:34:11 +08:00
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#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
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FIX_OHCI1394_BASE,
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#endif
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2008-06-25 12:19:03 +08:00
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__end_of_permanent_fixed_addresses,
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/*
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* 256 temporary boot-time mappings, used by early_ioremap(),
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* before ioremap() is functional.
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*
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* We round it up to the next 512 pages boundary so that we
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* can have a single pgd entry and a single pte table:
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*/
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#define NR_FIX_BTMAPS 64
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#define FIX_BTMAPS_NESTING 4
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FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 512 -
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(__end_of_permanent_fixed_addresses & 511),
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FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_NESTING - 1,
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2005-04-17 06:20:36 +08:00
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__end_of_fixed_addresses
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};
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#define FIXADDR_TOP (VSYSCALL_END-PAGE_SIZE)
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#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
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#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
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/* Only covers 32bit vsyscalls currently. Need another set for 64bit. */
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#define FIXADDR_USER_START ((unsigned long)VSYSCALL32_VSYSCALL)
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#define FIXADDR_USER_END (FIXADDR_USER_START + PAGE_SIZE)
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#endif
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