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| author |   Vasily Gorbik <gor@linux.ibm.com> | 2018-04-03 16:03:32 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-04-10 07:38:59 +0200 |
| commit | d485235b005407ae64246a8fe2171d1b369b3b30 (patch) | |
| tree | 93a2a5b33b06b4d790c32a22eece0e3c1d6ea4a6 /arch/s390/kernel/relocate_kernel.S | |
| parent | s390/ipl: avoid adding scpdata to cmdline during ftp/dvd boot (diff) | |
| download | linux-dev-d485235b005407ae64246a8fe2171d1b369b3b30.tar.xz linux-dev-d485235b005407ae64246a8fe2171d1b369b3b30.zip | |
s390: assume diag308 set always works
diag308 set has been available for many machine generations, and
alternative reipl code paths has not been exercised and seems to be
broken without noticing for a while now. So, cleaning up all obsolete
reipl methods except currently used ones, assuming that diag308 set
always works.
Also removing not longer needed reset callbacks.
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/relocate_kernel.S')
| -rw-r--r-- | arch/s390/kernel/relocate_kernel.S | 54 |
1 files changed, 4 insertions, 50 deletions
diff --git a/arch/s390/kernel/relocate_kernel.S b/arch/s390/kernel/relocate_kernel.S index 9c2c96da23d0..c97c2d40fe15 100644 --- a/arch/s390/kernel/relocate_kernel.S +++ b/arch/s390/kernel/relocate_kernel.S @@ -29,33 +29,6 @@ ENTRY(relocate_kernel) basr %r13,0 # base address .base: - stctg %c0,%c15,ctlregs-.base(%r13) - stmg %r0,%r15,gprregs-.base(%r13) - lghi %r0,3 - sllg %r0,%r0,31 - stg %r0,0x1d0(%r0) - la %r0,.back_pgm-.base(%r13) - stg %r0,0x1d8(%r0) - la %r1,load_psw-.base(%r13) - mvc 0(8,%r0),0(%r1) - la %r0,.back-.base(%r13) - st %r0,4(%r0) - oi 4(%r0),0x80 - lghi %r0,0 - diag %r0,%r0,0x308 - .back: - lhi %r1,1 # mode 1 = esame - sigp %r1,%r0,SIGP_SET_ARCHITECTURE # switch to esame mode - sam64 # switch to 64 bit addressing mode - basr %r13,0 - .back_base: - oi have_diag308-.back_base(%r13),0x01 - lctlg %c0,%c15,ctlregs-.back_base(%r13) - lmg %r0,%r15,gprregs-.back_base(%r13) - j .top - .back_pgm: - lmg %r0,%r15,gprregs-.base(%r13) - .top: lghi %r7,PAGE_SIZE # load PAGE_SIZE in r7 lghi %r9,PAGE_SIZE # load PAGE_SIZE in r9 lg %r5,0(%r2) # read another word for indirection page @@ -64,55 +37,36 @@ ENTRY(relocate_kernel) je .indir_check # NO, goto "indir_check" lgr %r6,%r5 # r6 = r5 nill %r6,0xf000 # mask it out and... - j .top # ...next iteration + j .base # ...next iteration .indir_check: tml %r5,0x2 # is it a indirection page? je .done_test # NO, goto "done_test" nill %r5,0xf000 # YES, mask out, lgr %r2,%r5 # move it into the right register, - j .top # and read next... + j .base # and read next... .done_test: tml %r5,0x4 # is it the done indicator? je .source_test # NO! Well, then it should be the source indicator... j .done # ok, lets finish it here... .source_test: tml %r5,0x8 # it should be a source indicator... - je .top # NO, ignore it... + je .base # NO, ignore it... lgr %r8,%r5 # r8 = r5 nill %r8,0xf000 # masking 0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0 jo 0b - j .top + j .base .done: sgr %r0,%r0 # clear register r0 la %r4,load_psw-.base(%r13) # load psw-address into the register o %r3,4(%r4) # or load address into psw st %r3,4(%r4) mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0 - tm have_diag308-.base(%r13),0x01 - jno .no_diag308 diag %r0,%r0,0x308 - .no_diag308: - sam31 # 31 bit mode - sr %r1,%r1 # erase register r1 - sr %r2,%r2 # erase register r2 - sigp %r1,%r2,SIGP_SET_ARCHITECTURE # set cpuid to zero - lpsw 0 # hopefully start new kernel... .align 8 load_psw: .long 0x00080000,0x80000000 - ctlregs: - .rept 16 - .quad 0 - .endr - gprregs: - .rept 16 - .quad 0 - .endr - have_diag308: - .byte 0 - .align 8 relocate_kernel_end: .align 8 .globl relocate_kernel_len |