linux-2.6/arch/s390/power/swsusp.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();
}