mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 10:16:49 +07:00
f49688d459
Signed-off-by: Paolo Ciarrocchi <paolo.ciarrocchi@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
/*
|
|
* sleep.c - x86-specific ACPI sleep support.
|
|
*
|
|
* Copyright (C) 2001-2003 Patrick Mochel
|
|
* Copyright (C) 2001-2003 Pavel Machek <pavel@suse.cz>
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/dmi.h>
|
|
#include <linux/cpumask.h>
|
|
|
|
#include <asm/smp.h>
|
|
|
|
/* address in low memory of the wakeup routine. */
|
|
unsigned long acpi_wakeup_address;
|
|
unsigned long acpi_realmode_flags;
|
|
extern char wakeup_start, wakeup_end;
|
|
|
|
extern unsigned long acpi_copy_wakeup_routine(unsigned long);
|
|
|
|
/**
|
|
* acpi_save_state_mem - save kernel state
|
|
*
|
|
* Create an identity mapped page table and copy the wakeup routine to
|
|
* low memory.
|
|
*/
|
|
int acpi_save_state_mem(void)
|
|
{
|
|
if (!acpi_wakeup_address) {
|
|
printk(KERN_ERR "Could not allocate memory during boot, S3 disabled\n");
|
|
return -ENOMEM;
|
|
}
|
|
memcpy((void *)acpi_wakeup_address, &wakeup_start,
|
|
&wakeup_end - &wakeup_start);
|
|
acpi_copy_wakeup_routine(acpi_wakeup_address);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* acpi_restore_state - undo effects of acpi_save_state_mem
|
|
*/
|
|
void acpi_restore_state_mem(void)
|
|
{
|
|
}
|
|
|
|
|
|
/**
|
|
* acpi_reserve_bootmem - do _very_ early ACPI initialisation
|
|
*
|
|
* We allocate a page from the first 1MB of memory for the wakeup
|
|
* routine for when we come back from a sleep state. The
|
|
* runtime allocator allows specification of <16MB pages, but not
|
|
* <1MB pages.
|
|
*/
|
|
void __init acpi_reserve_bootmem(void)
|
|
{
|
|
if ((&wakeup_end - &wakeup_start) > PAGE_SIZE*2) {
|
|
printk(KERN_ERR
|
|
"ACPI: Wakeup code way too big, S3 disabled.\n");
|
|
return;
|
|
}
|
|
|
|
acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE*2);
|
|
if (!acpi_wakeup_address)
|
|
printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
|
|
}
|
|
|
|
|
|
static int __init acpi_sleep_setup(char *str)
|
|
{
|
|
while ((str != NULL) && (*str != '\0')) {
|
|
if (strncmp(str, "s3_bios", 7) == 0)
|
|
acpi_realmode_flags |= 1;
|
|
if (strncmp(str, "s3_mode", 7) == 0)
|
|
acpi_realmode_flags |= 2;
|
|
if (strncmp(str, "s3_beep", 7) == 0)
|
|
acpi_realmode_flags |= 4;
|
|
str = strchr(str, ',');
|
|
if (str != NULL)
|
|
str += strspn(str, ", \t");
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
__setup("acpi_sleep=", acpi_sleep_setup);
|