43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
/*
|
|
* Support for suspend and resume on s390
|
|
*
|
|
* Copyright IBM Corp. 2009
|
|
*
|
|
* Author(s): Hans-Joachim Picht <hans@linux.vnet.ibm.com>
|
|
*
|
|
*/
|
|
|
|
#include <asm/system.h>
|
|
|
|
void save_processor_state(void)
|
|
{
|
|
/* swsusp_arch_suspend() actually saves all cpu register contents.
|
|
* Machine checks must be disabled since swsusp_arch_suspend() stores
|
|
* register contents to their lowcore save areas. That's the same
|
|
* place where register contents on machine checks would be saved.
|
|
* To avoid register corruption disable machine checks.
|
|
* We must also disable machine checks in the new psw mask for
|
|
* program checks, since swsusp_arch_suspend() may generate program
|
|
* checks. Disabling machine checks for all other new psw masks is
|
|
* just paranoia.
|
|
*/
|
|
local_mcck_disable();
|
|
/* Disable lowcore protection */
|
|
__ctl_clear_bit(0,28);
|
|
S390_lowcore.external_new_psw.mask &= ~PSW_MASK_MCHECK;
|
|
S390_lowcore.svc_new_psw.mask &= ~PSW_MASK_MCHECK;
|
|
S390_lowcore.io_new_psw.mask &= ~PSW_MASK_MCHECK;
|
|
S390_lowcore.program_new_psw.mask &= ~PSW_MASK_MCHECK;
|
|
}
|
|
|
|
void restore_processor_state(void)
|
|
{
|
|
S390_lowcore.external_new_psw.mask |= PSW_MASK_MCHECK;
|
|
S390_lowcore.svc_new_psw.mask |= PSW_MASK_MCHECK;
|
|
S390_lowcore.io_new_psw.mask |= PSW_MASK_MCHECK;
|
|
S390_lowcore.program_new_psw.mask |= PSW_MASK_MCHECK;
|
|
/* Enable lowcore protection */
|
|
__ctl_set_bit(0,28);
|
|
local_mcck_enable();
|
|
}
|