mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-02 05:46:47 +07:00
7f8998c7ae
The different architectures used their own (and different) declarations:
extern __visible const void __nosave_begin, __nosave_end;
extern const void __nosave_begin, __nosave_end;
extern long __nosave_begin, __nosave_end;
Consolidate them using the first variant in <asm/sections.h>.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
148 lines
3.5 KiB
C
148 lines
3.5 KiB
C
/*
|
|
* Hibernation support for x86-64
|
|
*
|
|
* Distribute under GPLv2
|
|
*
|
|
* Copyright (c) 2007 Rafael J. Wysocki <rjw@sisk.pl>
|
|
* Copyright (c) 2002 Pavel Machek <pavel@ucw.cz>
|
|
* Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
|
|
*/
|
|
|
|
#include <linux/gfp.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/suspend.h>
|
|
|
|
#include <asm/init.h>
|
|
#include <asm/proto.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/mtrr.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/suspend.h>
|
|
|
|
/* Defined in hibernate_asm_64.S */
|
|
extern asmlinkage __visible int restore_image(void);
|
|
|
|
/*
|
|
* Address to jump to in the last phase of restore in order to get to the image
|
|
* kernel's text (this value is passed in the image header).
|
|
*/
|
|
unsigned long restore_jump_address __visible;
|
|
|
|
/*
|
|
* Value of the cr3 register from before the hibernation (this value is passed
|
|
* in the image header).
|
|
*/
|
|
unsigned long restore_cr3 __visible;
|
|
|
|
pgd_t *temp_level4_pgt __visible;
|
|
|
|
void *relocated_restore_code __visible;
|
|
|
|
static void *alloc_pgt_page(void *context)
|
|
{
|
|
return (void *)get_safe_page(GFP_ATOMIC);
|
|
}
|
|
|
|
static int set_up_temporary_mappings(void)
|
|
{
|
|
struct x86_mapping_info info = {
|
|
.alloc_pgt_page = alloc_pgt_page,
|
|
.pmd_flag = __PAGE_KERNEL_LARGE_EXEC,
|
|
.kernel_mapping = true,
|
|
};
|
|
unsigned long mstart, mend;
|
|
int result;
|
|
int i;
|
|
|
|
temp_level4_pgt = (pgd_t *)get_safe_page(GFP_ATOMIC);
|
|
if (!temp_level4_pgt)
|
|
return -ENOMEM;
|
|
|
|
/* It is safe to reuse the original kernel mapping */
|
|
set_pgd(temp_level4_pgt + pgd_index(__START_KERNEL_map),
|
|
init_level4_pgt[pgd_index(__START_KERNEL_map)]);
|
|
|
|
/* Set up the direct mapping from scratch */
|
|
for (i = 0; i < nr_pfn_mapped; i++) {
|
|
mstart = pfn_mapped[i].start << PAGE_SHIFT;
|
|
mend = pfn_mapped[i].end << PAGE_SHIFT;
|
|
|
|
result = kernel_ident_mapping_init(&info, temp_level4_pgt,
|
|
mstart, mend);
|
|
|
|
if (result)
|
|
return result;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int swsusp_arch_resume(void)
|
|
{
|
|
int error;
|
|
|
|
/* We have got enough memory and from now on we cannot recover */
|
|
if ((error = set_up_temporary_mappings()))
|
|
return error;
|
|
|
|
relocated_restore_code = (void *)get_safe_page(GFP_ATOMIC);
|
|
if (!relocated_restore_code)
|
|
return -ENOMEM;
|
|
memcpy(relocated_restore_code, &core_restore_code,
|
|
&restore_registers - &core_restore_code);
|
|
|
|
restore_image();
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* pfn_is_nosave - check if given pfn is in the 'nosave' section
|
|
*/
|
|
|
|
int pfn_is_nosave(unsigned long pfn)
|
|
{
|
|
unsigned long nosave_begin_pfn = __pa_symbol(&__nosave_begin) >> PAGE_SHIFT;
|
|
unsigned long nosave_end_pfn = PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT;
|
|
return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
|
|
}
|
|
|
|
struct restore_data_record {
|
|
unsigned long jump_address;
|
|
unsigned long cr3;
|
|
unsigned long magic;
|
|
};
|
|
|
|
#define RESTORE_MAGIC 0x0123456789ABCDEFUL
|
|
|
|
/**
|
|
* arch_hibernation_header_save - populate the architecture specific part
|
|
* of a hibernation image header
|
|
* @addr: address to save the data at
|
|
*/
|
|
int arch_hibernation_header_save(void *addr, unsigned int max_size)
|
|
{
|
|
struct restore_data_record *rdr = addr;
|
|
|
|
if (max_size < sizeof(struct restore_data_record))
|
|
return -EOVERFLOW;
|
|
rdr->jump_address = restore_jump_address;
|
|
rdr->cr3 = restore_cr3;
|
|
rdr->magic = RESTORE_MAGIC;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* arch_hibernation_header_restore - read the architecture specific data
|
|
* from the hibernation image header
|
|
* @addr: address to read the data from
|
|
*/
|
|
int arch_hibernation_header_restore(void *addr)
|
|
{
|
|
struct restore_data_record *rdr = addr;
|
|
|
|
restore_jump_address = rdr->jump_address;
|
|
restore_cr3 = rdr->cr3;
|
|
return (rdr->magic == RESTORE_MAGIC) ? 0 : -EINVAL;
|
|
}
|