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Commit b43445ff authored by Michael Holzheu's avatar Michael Holzheu Committed by Martin Schwidefsky
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[S390] Use copy_to_absolute_zero() instead of "stura/sturg" 



Use the new copy_to_absolute_zero() function instead of manual "stura"
and "sturg" to make the code shorter and more readable.

Signed-off-by: default avatarMichael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 4c1051e3

arch/s390/kernel/ipl.c

+6 −24
Original line number Diff line number Diff line
@@ -1498,30 +1498,12 @@ static struct shutdown_action __refdata dump_action = { 


static void dump_reipl_run(struct shutdown_trigger *trigger)

{

	preempt_disable();

	/*

	 * Bypass dynamic address translation (DAT) when storing IPL parameter

	 * information block address and checksum into the prefix area

	 * (corresponding to absolute addresses 0-8191).

	 * When enhanced DAT applies and the STE format control in one,

	 * the absolute address is formed without prefixing. In this case a

	 * normal store (stg/st) into the prefix area would no more match to

	 * absolute addresses 0-8191.

	 */

#ifdef CONFIG_64BIT

	asm volatile("sturg %0,%1"

		:: "a" ((unsigned long) reipl_block_actual),

		"a" (&lowcore_ptr[smp_processor_id()]->ipib));

#else

	asm volatile("stura %0,%1"

		:: "a" ((unsigned long) reipl_block_actual),

		"a" (&lowcore_ptr[smp_processor_id()]->ipib));

#endif

	asm volatile("stura %0,%1"

		:: "a" (csum_partial(reipl_block_actual,

				     reipl_block_actual->hdr.len, 0)),

		"a" (&lowcore_ptr[smp_processor_id()]->ipib_checksum));

	preempt_enable();

	u32 csum;



	csum = csum_partial(reipl_block_actual, reipl_block_actual->hdr.len, 0);

	copy_to_absolute_zero(&S390_lowcore.ipib_checksum, &csum, sizeof(csum));

	copy_to_absolute_zero(&S390_lowcore.ipib, &reipl_block_actual,

			      sizeof(reipl_block_actual));

	dump_run(trigger);

}