1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright IBM Corp. 1999, 2010
5 * Author(s): Hartmut Penner <hp@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Rob van der Heij <rvdhei@iae.nl>
8 * Heiko Carstens <heiko.carstens@de.ibm.com>
10 * There are 5 different IPL methods
11 * 1) load the image directly into ram at address 0 and do an PSW restart
12 * 2) linload will load the image from address 0x10000 to memory 0x10000
13 * and start the code thru LPSW 0x0008000080010000 (VM only, deprecated)
14 * 3) generate the tape ipl header, store the generated image on a tape
16 * In case of SL tape you need to IPL 5 times to get past VOL1 etc
17 * 4) generate the vm reader ipl header, move the generated image to the
18 * VM reader (use option NOH!) and do a ipl from reader (VM only)
19 * 5) direct call of start by the SALIPL loader
20 * We use the cpuid to distinguish between VM and native ipl
21 * params for kernel are pushed to 0x10400 (see setup.h)
25 #include <linux/init.h>
26 #include <linux/linkage.h>
27 #include <asm/asm-offsets.h>
28 #include <asm/thread_info.h>
30 #include <asm/ptrace.h>
38 .long 0x00080000,0x80000000+iplstart # The first 24 bytes are loaded
39 .long 0x02000018,0x60000050 # by ipl to addresses 0-23.
40 .long 0x02000068,0x60000050 # (a PSW and two CCWs).
41 .fill 80-24,1,0x40 # bytes 24-79 are discarded !!
42 .long 0x020000f0,0x60000050 # The next 160 byte are loaded
43 .long 0x02000140,0x60000050 # to addresses 0x18-0xb7
44 .long 0x02000190,0x60000050 # They form the continuation
45 .long 0x020001e0,0x60000050 # of the CCW program started
46 .long 0x02000230,0x60000050 # by ipl and load the range
47 .long 0x02000280,0x60000050 # 0x0f0-0x730 from the image
48 .long 0x020002d0,0x60000050 # to the range 0x0f0-0x730
49 .long 0x02000320,0x60000050 # in memory. At the end of
50 .long 0x02000370,0x60000050 # the channel program the PSW
51 .long 0x020003c0,0x60000050 # at location 0 is loaded.
52 .long 0x02000410,0x60000050 # Initial processing starts
53 .long 0x02000460,0x60000050 # at 0x200 = iplstart.
54 .long 0x020004b0,0x60000050
55 .long 0x02000500,0x60000050
56 .long 0x02000550,0x60000050
57 .long 0x020005a0,0x60000050
58 .long 0x020005f0,0x60000050
59 .long 0x02000640,0x60000050
60 .long 0x02000690,0x60000050
61 .long 0x020006e0,0x20000050
69 # subroutine to wait for end I/O
72 mvc __LC_IO_NEW_PSW(16),.Lnewpsw # set up IO interrupt psw
78 .quad 0x0000000080000000,.Lioint
80 .long 0x020a0000,0x80000000+.Lioint
83 # subroutine for loading cards from the reader
87 la %r3,.Lorb # r2 = address of orb into r2
88 la %r5,.Lirb # r4 = address of irb
92 st %r2,4(%r6) # initialize CCW data addresses
97 lctl %c6,%c6,.Lcr6 # set IO subclass mask
100 ssch 0(%r3) # load chunk of 1600 bytes
104 c %r1,__LC_SUBCHANNEL_ID # compare subchannel number
109 ic %r0,8(%r5) # get device status
110 chi %r0,8 # channel end ?
112 chi %r0,12 # channel end + device end ?
116 s %r0,8(%r3) # r0/8 = number of ccws executed
117 mhi %r0,10 # *10 = number of bytes in ccws
118 lh %r3,10(%r5) # get residual count
119 sr %r0,%r3 # #ccws*80-residual=#bytes read
122 br %r4 # r2 contains the total size
125 ahi %r2,0x640 # add 0x640 to total size
129 l %r0,4(%r6) # update CCW data addresses
140 .Lorb: .long 0x00000000,0x0080ff00,.Lccws
141 .Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
142 .Lcr6: .long 0xff000000
145 .Lcrash:.long 0x000a0000,0x00000000
149 .long 0x02600050,0x00000000
151 .long 0x02200050,0x00000000
154 mvi __LC_AR_MODE_ID,1 # set esame flag
155 slr %r0,%r0 # set cpuid to zero
156 lhi %r1,2 # mode 2 = esame (dump)
157 sigp %r1,%r0,0x12 # switch to esame mode
160 0: lmh %r0,%r15,0(%r13) # clear high-order half of gprs
161 sam31 # switch to 31 bit addressing mode
162 lh %r1,__LC_SUBCHANNEL_ID # test if subchannel number
163 bct %r1,.Lnoload # is valid
164 l %r1,__LC_SUBCHANNEL_ID # load ipl subchannel number
165 la %r2,IPL_BS # load start address
166 bas %r14,.Lloader # load rest of ipl image
167 l %r12,.Lparm # pointer to parameter area
168 st %r1,IPL_DEVICE+ARCH_OFFSET-PARMAREA(%r12) # save ipl device number
171 # load parameter file from ipl device
174 l %r2,.Linitrd # ramdisk loc. is temp
175 bas %r14,.Lloader # load parameter file
176 ltr %r2,%r2 # got anything ?
183 clc 0(3,%r4),.L_hdr # if it is HDRx
184 bz .Lagain1 # skip dataset header
185 clc 0(3,%r4),.L_eof # if it is EOFx
186 bz .Lagain1 # skip dateset trailer
189 la %r3,COMMAND_LINE-PARMAREA(%r12) # load adr. of command line
190 mvc 0(256,%r3),0(%r4)
191 mvc 256(256,%r3),256(%r4)
192 mvc 512(256,%r3),512(%r4)
193 mvc 768(122,%r3),768(%r4)
198 chi %r0,0x20 # is it a space ?
206 stc %r0,0(%r2,%r3) # terminate buffer
210 # load ramdisk from ipl device
213 l %r2,.Linitrd # addr of ramdisk
214 st %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12)
215 bas %r14,.Lloader # load ramdisk
216 st %r2,INITRD_SIZE+ARCH_OFFSET-PARMAREA(%r12) # store size of rd
219 st %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12) # no ramdisk found
223 clc 0(3,%r2),.L_hdr # skip HDRx and EOFx
229 # reset files in VM reader
231 stidp .Lcpuid # store cpuid
232 tm .Lcpuid,0xff # running VM ?
238 stsch 0(%r5) # check if irq is pending
239 tm 30(%r5),0x0f # by verifying if any of the
240 bnz .Lwaitforirq # activity or status control
241 tm 31(%r5),0xff # bits is set in the schib
244 bas %r14,.Lirqwait # wait for IO interrupt
245 c %r1,__LC_SUBCHANNEL_ID # compare subchannel number
253 # everything loaded, go for it
259 .Linitrd:.long _end # default address of initrd
260 .Lparm: .long PARMAREA
261 .Lstartup: .long startup
262 .Lreset:.byte 0xc3,0xc8,0xc1,0xd5,0xc7,0xc5,0x40,0xd9,0xc4,0xd9,0x40
263 .byte 0xc1,0xd3,0xd3,0x40,0xd2,0xc5,0xc5,0xd7,0x40,0xd5,0xd6
264 .byte 0xc8,0xd6,0xd3,0xc4 # "change rdr all keep nohold"
265 .L_eof: .long 0xc5d6c600 /* C'EOF' */
266 .L_hdr: .long 0xc8c4d900 /* C'HDR' */
271 # startup-code at 0x10000, running in absolute addressing mode
272 # this is called either by the ipl loader or directly by PSW restart
273 # or linload or SALIPL
277 j .Lep_startup_normal
280 # This is a list of s390 kernel entry points. At address 0x1000f the number of
281 # valid entry points is stored.
283 # IMPORTANT: Do not change this table, it is s390 kernel ABI!
288 # kdump startup-code at 0x10010, running in 64 bit absolute addressing mode
294 mvi __LC_AR_MODE_ID,1 # set esame flag
295 slr %r0,%r0 # set cpuid to zero
296 lhi %r1,2 # mode 2 = esame (dump)
297 sigp %r1,%r0,0x12 # switch to esame mode
300 0: lmh %r0,%r15,0(%r13) # clear high-order half of gprs
301 sam64 # switch to 64 bit addressing mode
302 basr %r13,0 # get base
304 xc 0x200(256),0x200 # partially clear lowcore
308 lctlg %c0,%c15,0x200(%r0) # initialize control registers
309 stcke __LC_BOOT_CLOCK
310 mvc __LC_LAST_UPDATE_CLOCK(8),__LC_BOOT_CLOCK+1
312 mvc __LC_LAST_UPDATE_TIMER(8),6f-.LPG0(%r13)
313 l %r15,.Lstack-.LPG0(%r13)
314 brasl %r14,verify_facilities
315 brasl %r14,startup_kernel
318 .long 0x8000 + (1<<(PAGE_SHIFT+BOOT_STACK_ORDER)) - STACK_FRAME_OVERHEAD
320 6: .long 0x7fffffff,0xffffffff
322 #include "head_kdump.S"
325 # params at 10400 (setup.h)
328 .long 0,0 # IPL_DEVICE
329 .long 0,0 # INITRD_START
330 .long 0,0 # INITRD_SIZE
331 .long 0,0 # OLDMEM_BASE
332 .long 0,0 # OLDMEM_SIZE
335 .byte "root=/dev/ram0 ro"