Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 340 insertions, 0 deletions

diff --git a/arch/s390/boot/head.S b/arch/s390/boot/head.S
new file mode 100644
index 000000000..f721913b7
--- /dev/null
+++ b/arch/s390/boot/head.S
@@ -0,0 +1,340 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright IBM Corp. 1999, 2010
+ *
+ *    Author(s): Hartmut Penner <hp@de.ibm.com>
+ *		 Martin Schwidefsky <schwidefsky@de.ibm.com>
+ *		 Rob van der Heij <rvdhei@iae.nl>
+ *		 Heiko Carstens <heiko.carstens@de.ibm.com>
+ *
+ * There are 5 different IPL methods
+ *  1) load the image directly into ram at address 0 and do an PSW restart
+ *  2) linload will load the image from address 0x10000 to memory 0x10000
+ *     and start the code thru LPSW 0x0008000080010000 (VM only, deprecated)
+ *  3) generate the tape ipl header, store the generated image on a tape
+ *     and ipl from it
+ *     In case of SL tape you need to IPL 5 times to get past VOL1 etc
+ *  4) generate the vm reader ipl header, move the generated image to the
+ *     VM reader (use option NOH!) and do a ipl from reader (VM only)
+ *  5) direct call of start by the SALIPL loader
+ *  We use the cpuid to distinguish between VM and native ipl
+ *  params for kernel are pushed to 0x10400 (see setup.h)
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <asm/asm-offsets.h>
+#include <asm/thread_info.h>
+#include <asm/page.h>
+#include <asm/ptrace.h>
+
+#define ARCH_OFFSET	4
+
+__HEAD
+
+#define IPL_BS	0x730
+	.org	0
+	.long	0x00080000,0x80000000+iplstart	# The first 24 bytes are loaded
+	.long	0x02000018,0x60000050		# by ipl to addresses 0-23.
+	.long	0x02000068,0x60000050		# (a PSW and two CCWs).
+	.fill	80-24,1,0x40			# bytes 24-79 are discarded !!
+	.long	0x020000f0,0x60000050		# The next 160 byte are loaded
+	.long	0x02000140,0x60000050		# to addresses 0x18-0xb7
+	.long	0x02000190,0x60000050		# They form the continuation
+	.long	0x020001e0,0x60000050		# of the CCW program started
+	.long	0x02000230,0x60000050		# by ipl and load the range
+	.long	0x02000280,0x60000050		# 0x0f0-0x730 from the image
+	.long	0x020002d0,0x60000050		# to the range 0x0f0-0x730
+	.long	0x02000320,0x60000050		# in memory. At the end of
+	.long	0x02000370,0x60000050		# the channel program the PSW
+	.long	0x020003c0,0x60000050		# at location 0 is loaded.
+	.long	0x02000410,0x60000050		# Initial processing starts
+	.long	0x02000460,0x60000050		# at 0x200 = iplstart.
+	.long	0x020004b0,0x60000050
+	.long	0x02000500,0x60000050
+	.long	0x02000550,0x60000050
+	.long	0x020005a0,0x60000050
+	.long	0x020005f0,0x60000050
+	.long	0x02000640,0x60000050
+	.long	0x02000690,0x60000050
+	.long	0x020006e0,0x20000050
+
+	.org	0x200
+
+#
+# subroutine to wait for end I/O
+#
+.Lirqwait:
+	mvc	__LC_IO_NEW_PSW(16),.Lnewpsw	# set up IO interrupt psw
+	lpsw	.Lwaitpsw
+.Lioint:
+	br	%r14
+	.align	8
+.Lnewpsw:
+	.quad	0x0000000080000000,.Lioint
+.Lwaitpsw:
+	.long	0x020a0000,0x80000000+.Lioint
+
+#
+# subroutine for loading cards from the reader
+#
+.Lloader:
+	la	%r4,0(%r14)
+	la	%r3,.Lorb		# r2 = address of orb into r2
+	la	%r5,.Lirb		# r4 = address of irb
+	la	%r6,.Lccws
+	la	%r7,20
+.Linit:
+	st	%r2,4(%r6)		# initialize CCW data addresses
+	la	%r2,0x50(%r2)
+	la	%r6,8(%r6)
+	bct	7,.Linit
+
+	lctl	%c6,%c6,.Lcr6		# set IO subclass mask
+	slr	%r2,%r2
+.Lldlp:
+	ssch	0(%r3)			# load chunk of 1600 bytes
+	bnz	.Llderr
+.Lwait4irq:
+	bas	%r14,.Lirqwait
+	c	%r1,__LC_SUBCHANNEL_ID	# compare subchannel number
+	bne	.Lwait4irq
+	tsch	0(%r5)
+
+	slr	%r0,%r0
+	ic	%r0,8(%r5)		# get device status
+	chi	%r0,8			# channel end ?
+	be	.Lcont
+	chi	%r0,12			# channel end + device end ?
+	be	.Lcont
+
+	l	%r0,4(%r5)
+	s	%r0,8(%r3)		# r0/8 = number of ccws executed
+	mhi	%r0,10			# *10 = number of bytes in ccws
+	lh	%r3,10(%r5)		# get residual count
+	sr	%r0,%r3 		# #ccws*80-residual=#bytes read
+	ar	%r2,%r0
+
+	br	%r4			# r2 contains the total size
+
+.Lcont:
+	ahi	%r2,0x640		# add 0x640 to total size
+	la	%r6,.Lccws
+	la	%r7,20
+.Lincr:
+	l	%r0,4(%r6)		# update CCW data addresses
+	ahi	%r0,0x640
+	st	%r0,4(%r6)
+	ahi	%r6,8
+	bct	7,.Lincr
+
+	b	.Lldlp
+.Llderr:
+	lpsw	.Lcrash
+
+	.align	8
+.Lorb:	.long	0x00000000,0x0080ff00,.Lccws
+.Lirb:	.long	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+.Lcr6:	.long	0xff000000
+.Lloadp:.long	0,0
+	.align	8
+.Lcrash:.long	0x000a0000,0x00000000
+
+	.align	8
+.Lccws: .rept	19
+	.long	0x02600050,0x00000000
+	.endr
+	.long	0x02200050,0x00000000
+
+iplstart:
+	mvi	__LC_AR_MODE_ID,1	# set esame flag
+	slr	%r0,%r0			# set cpuid to zero
+	lhi	%r1,2			# mode 2 = esame (dump)
+	sigp	%r1,%r0,0x12		# switch to esame mode
+	bras	%r13,0f
+	.fill	16,4,0x0
+0:	lmh	%r0,%r15,0(%r13)	# clear high-order half of gprs
+	sam31				# switch to 31 bit addressing mode
+	lh	%r1,__LC_SUBCHANNEL_ID	# test if subchannel number
+	bct	%r1,.Lnoload		#  is valid
+	l	%r1,__LC_SUBCHANNEL_ID	# load ipl subchannel number
+	la	%r2,IPL_BS		# load start address
+	bas	%r14,.Lloader		# load rest of ipl image
+	l	%r12,.Lparm		# pointer to parameter area
+	st	%r1,IPL_DEVICE+ARCH_OFFSET-PARMAREA(%r12) # save ipl device number
+
+#
+# load parameter file from ipl device
+#
+.Lagain1:
+	l	%r2,.Linitrd		# ramdisk loc. is temp
+	bas	%r14,.Lloader		# load parameter file
+	ltr	%r2,%r2 		# got anything ?
+	bz	.Lnopf
+	chi	%r2,895
+	bnh	.Lnotrunc
+	la	%r2,895
+.Lnotrunc:
+	l	%r4,.Linitrd
+	clc	0(3,%r4),.L_hdr		# if it is HDRx
+	bz	.Lagain1		# skip dataset header
+	clc	0(3,%r4),.L_eof		# if it is EOFx
+	bz	.Lagain1		# skip dateset trailer
+	la	%r5,0(%r4,%r2)
+	lr	%r3,%r2
+	la	%r3,COMMAND_LINE-PARMAREA(%r12) # load adr. of command line
+	mvc	0(256,%r3),0(%r4)
+	mvc	256(256,%r3),256(%r4)
+	mvc	512(256,%r3),512(%r4)
+	mvc	768(122,%r3),768(%r4)
+	slr	%r0,%r0
+	b	.Lcntlp
+.Ldelspc:
+	ic	%r0,0(%r2,%r3)
+	chi	%r0,0x20		# is it a space ?
+	be	.Lcntlp
+	ahi	%r2,1
+	b	.Leolp
+.Lcntlp:
+	brct	%r2,.Ldelspc
+.Leolp:
+	slr	%r0,%r0
+	stc	%r0,0(%r2,%r3)		# terminate buffer
+.Lnopf:
+
+#
+# load ramdisk from ipl device
+#
+.Lagain2:
+	l	%r2,.Linitrd		# addr of ramdisk
+	st	%r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12)
+	bas	%r14,.Lloader		# load ramdisk
+	st	%r2,INITRD_SIZE+ARCH_OFFSET-PARMAREA(%r12) # store size of rd
+	ltr	%r2,%r2
+	bnz	.Lrdcont
+	st	%r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12) # no ramdisk found
+.Lrdcont:
+	l	%r2,.Linitrd
+
+	clc	0(3,%r2),.L_hdr		# skip HDRx and EOFx
+	bz	.Lagain2
+	clc	0(3,%r2),.L_eof
+	bz	.Lagain2
+
+#
+# reset files in VM reader
+#
+	stidp	.Lcpuid			# store cpuid
+	tm	.Lcpuid,0xff		# running VM ?
+	bno	.Lnoreset
+	la	%r2,.Lreset
+	lhi	%r3,26
+	diag	%r2,%r3,8
+	la	%r5,.Lirb
+	stsch	0(%r5)			# check if irq is pending
+	tm	30(%r5),0x0f		# by verifying if any of the
+	bnz	.Lwaitforirq		# activity or status control
+	tm	31(%r5),0xff		# bits is set in the schib
+	bz	.Lnoreset
+.Lwaitforirq:
+	bas	%r14,.Lirqwait		# wait for IO interrupt
+	c	%r1,__LC_SUBCHANNEL_ID	# compare subchannel number
+	bne	.Lwaitforirq
+	la	%r5,.Lirb
+	tsch	0(%r5)
+.Lnoreset:
+	b	.Lnoload
+
+#
+# everything loaded, go for it
+#
+.Lnoload:
+	l	%r1,.Lstartup
+	br	%r1
+
+.Linitrd:.long _end			# default address of initrd
+.Lparm:	.long  PARMAREA
+.Lstartup: .long startup
+.Lreset:.byte	0xc3,0xc8,0xc1,0xd5,0xc7,0xc5,0x40,0xd9,0xc4,0xd9,0x40
+	.byte	0xc1,0xd3,0xd3,0x40,0xd2,0xc5,0xc5,0xd7,0x40,0xd5,0xd6
+	.byte	0xc8,0xd6,0xd3,0xc4	# "change rdr all keep nohold"
+.L_eof: .long	0xc5d6c600	 /* C'EOF' */
+.L_hdr: .long	0xc8c4d900	 /* C'HDR' */
+	.align	8
+.Lcpuid:.fill	8,1,0
+
+#
+# startup-code at 0x10000, running in absolute addressing mode
+# this is called either by the ipl loader or directly by PSW restart
+# or linload or SALIPL
+#
+	.org	0x10000
+ENTRY(startup)
+	j	.Lep_startup_normal
+	.org	EP_OFFSET
+#
+# This is a list of s390 kernel entry points. At address 0x1000f the number of
+# valid entry points is stored.
+#
+# IMPORTANT: Do not change this table, it is s390 kernel ABI!
+#
+	.ascii	EP_STRING
+	.byte	0x00,0x01
+#
+# kdump startup-code at 0x10010, running in 64 bit absolute addressing mode
+#
+	.org	0x10010
+ENTRY(startup_kdump)
+	j	.Lep_startup_kdump
+.Lep_startup_normal:
+	mvi	__LC_AR_MODE_ID,1	# set esame flag
+	slr	%r0,%r0 		# set cpuid to zero
+	lhi	%r1,2			# mode 2 = esame (dump)
+	sigp	%r1,%r0,0x12		# switch to esame mode
+	bras	%r13,0f
+	.fill	16,4,0x0
+0:	lmh	%r0,%r15,0(%r13)	# clear high-order half of gprs
+	sam64				# switch to 64 bit addressing mode
+	basr	%r13,0			# get base
+.LPG0:
+	xc	0x200(256),0x200	# partially clear lowcore
+	xc	0x300(256),0x300
+	xc	0xe00(256),0xe00
+	xc	0xf00(256),0xf00
+	lctlg	%c0,%c15,0x200(%r0)	# initialize control registers
+	stcke	__LC_BOOT_CLOCK
+	mvc	__LC_LAST_UPDATE_CLOCK(8),__LC_BOOT_CLOCK+1
+	spt	6f-.LPG0(%r13)
+	mvc	__LC_LAST_UPDATE_TIMER(8),6f-.LPG0(%r13)
+	l	%r15,.Lstack-.LPG0(%r13)
+	ahi	%r15,-STACK_FRAME_OVERHEAD
+	brasl	%r14,verify_facilities
+#ifdef CONFIG_KERNEL_UNCOMPRESSED
+	jg	startup_continue
+#else
+	jg	startup_decompressor
+#endif
+
+.Lstack:
+	.long	0x8000 + (1<<(PAGE_SHIFT+THREAD_SIZE_ORDER))
+	.align	8
+6:	.long	0x7fffffff,0xffffffff
+
+#include "head_kdump.S"
+
+#
+# params at 10400 (setup.h)
+#
+	.org	PARMAREA
+	.long	0,0			# IPL_DEVICE
+	.long	0,0			# INITRD_START
+	.long	0,0			# INITRD_SIZE
+	.long	0,0			# OLDMEM_BASE
+	.long	0,0			# OLDMEM_SIZE
+
+	.org	COMMAND_LINE
+	.byte	"root=/dev/ram0 ro"
+	.byte	0
+
+	.org	0x11000