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https://github.com/FEX-Emu/linux.git
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d8e1baf10d
o Moved wakeup_level4_pgt into the wakeup routine so we can run the kernel above 4G. o Now we first go to 64bit mode and continue to run from trampoline and then then start accessing kernel symbols and restore processor context. This enables us to resume even in relocatable kernel context when kernel might not be loaded at physical addr it has been compiled for. o Removed the need for modifying any existing kernel page table. o Increased the size of the wakeup routine to 8K. This is required as wake page tables are on trampoline itself and they got to be at 4K boundary, hence one page is not sufficient. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andi Kleen <ak@suse.de>
123 lines
3.5 KiB
C
123 lines
3.5 KiB
C
/*
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* acpi.c - Architecture-Specific Low-Level ACPI Support
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*
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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* Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
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* Copyright (C) 2001 Patrick Mochel <mochel@osdl.org>
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* Copyright (C) 2002 Andi Kleen, SuSE Labs (x86-64 port)
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* Copyright (C) 2003 Pavel Machek, SuSE Labs
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/stddef.h>
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#include <linux/slab.h>
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#include <linux/pci.h>
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#include <linux/bootmem.h>
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#include <linux/acpi.h>
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#include <linux/cpumask.h>
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#include <asm/mpspec.h>
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#include <asm/io.h>
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#include <asm/apic.h>
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#include <asm/apicdef.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/io_apic.h>
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#include <asm/proto.h>
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#include <asm/tlbflush.h>
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/* --------------------------------------------------------------------------
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Low-Level Sleep Support
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-------------------------------------------------------------------------- */
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#ifdef CONFIG_ACPI_SLEEP
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/* address in low memory of the wakeup routine. */
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unsigned long acpi_wakeup_address = 0;
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unsigned long acpi_video_flags;
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extern char wakeup_start, wakeup_end;
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extern unsigned long acpi_copy_wakeup_routine(unsigned long);
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/**
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* acpi_save_state_mem - save kernel state
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*
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* Create an identity mapped page table and copy the wakeup routine to
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* low memory.
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*/
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int acpi_save_state_mem(void)
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{
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memcpy((void *)acpi_wakeup_address, &wakeup_start,
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&wakeup_end - &wakeup_start);
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acpi_copy_wakeup_routine(acpi_wakeup_address);
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return 0;
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}
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/*
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* acpi_restore_state
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*/
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void acpi_restore_state_mem(void)
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{
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}
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/**
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* acpi_reserve_bootmem - do _very_ early ACPI initialisation
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*
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* We allocate a page in low memory for the wakeup
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* routine for when we come back from a sleep state. The
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* runtime allocator allows specification of <16M pages, but not
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* <1M pages.
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*/
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void __init acpi_reserve_bootmem(void)
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{
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acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE*2);
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if ((&wakeup_end - &wakeup_start) > (PAGE_SIZE*2))
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printk(KERN_CRIT
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"ACPI: Wakeup code way too big, will crash on attempt"
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" to suspend\n");
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}
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static int __init acpi_sleep_setup(char *str)
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{
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while ((str != NULL) && (*str != '\0')) {
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if (strncmp(str, "s3_bios", 7) == 0)
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acpi_video_flags = 1;
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if (strncmp(str, "s3_mode", 7) == 0)
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acpi_video_flags |= 2;
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str = strchr(str, ',');
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if (str != NULL)
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str += strspn(str, ", \t");
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}
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return 1;
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}
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__setup("acpi_sleep=", acpi_sleep_setup);
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#endif /*CONFIG_ACPI_SLEEP */
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void acpi_pci_link_exit(void)
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{
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}
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