bdc7fe3638
We have to consume the outstanding service interrupt after each service call, otherwise a correct implementation will return CC=2 on subsequent service calls. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
66 lines
1.6 KiB
ArmAsm
66 lines
1.6 KiB
ArmAsm
/*
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* First stage boot loader for virtio devices. The compiled output goes
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* into the pc-bios directory of qemu.
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*
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* Copyright (c) 2013 Alexander Graf <agraf@suse.de>
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* Copyright 2013 IBM Corp.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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.globl _start
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_start:
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larl %r15, stack + 0x8000 /* Set up stack */
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larl %r6, boot_value
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stg %r7, 0(%r6) /* save the boot_value before any function calls */
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j main /* And call C */
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/*
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* void disabled_wait(void)
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*
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* stops the current guest cpu.
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*/
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.globl disabled_wait
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disabled_wait:
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larl %r1,disabled_wait_psw
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lpswe 0(%r1)
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/*
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* void consume_sclp_int(void)
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*
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* eats one sclp interrupt
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*/
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.globl consume_sclp_int
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consume_sclp_int:
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/* enable service interrupts in cr0 */
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stctg 0,0,0(15)
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oi 6(15), 0x2
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lctlg 0,0,0(15)
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/* prepare external call handler */
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larl %r1, external_new_code
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stg %r1, 0x1b8
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larl %r1, external_new_mask
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mvc 0x1b0(8),0(%r1)
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/* load enabled wait PSW */
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larl %r1, enabled_wait_psw
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lpswe 0(%r1)
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external_new_code:
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/* disable service interrupts in cr0 */
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stctg 0,0,0(15)
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ni 6(15), 0xfd
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lctlg 0,0,0(15)
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br 14
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.align 8
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disabled_wait_psw:
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.quad 0x0002000180000000,0x0000000000000000
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enabled_wait_psw:
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.quad 0x0302000180000000,0x0000000000000000
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external_new_mask:
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.quad 0x0000000180000000
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