- 18 12月, 2015 1 次提交
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由 Heiko Carstens 提交于
Now that 31 bit support is gone, the assembler always knows about the stfl instruction. Therefore lets use a readable mnemonic. Also remove the not needed extable entry for the inline assembly and fix the output constraint. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Reviewed-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 16 11月, 2015 1 次提交
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由 Heiko Carstens 提交于
There is no known user, therefore remove the code. Acked-by: NRob Van Der Heij <robvdheij@nl.ibm.com> Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 09 11月, 2015 1 次提交
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由 Sascha Silbe 提交于
startup calls the C function _sclp_print_early() if the machine we're running on is not supported by the kernel. sclp.c is getting built with -m64, so _sclp_print_early() expects the zSeries ELF ABI to be used. We previously called _sclp_print_early() using the S/390 ELF ABI, with a stack frame size of 96 bytes and while being in 31-bit address mode. This caused _sclp_wait_int() (called indirectly from _sclp_print_early()) to jump to an undefined address. While _sclp_wait_int() contained some code to deal with being called in 31-bit addressing mode, it didn't quite work. While fixing this is possible, the code would still only work by chance and could break any time. Ensure compliance with the zSeries ELF ABI by switching to 64-bit addressing mode early and using a minimum stack frame size of 160 bytes. Signed-off-by: NSascha Silbe <silbe@linux.vnet.ibm.com> Acked-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 19 8月, 2015 1 次提交
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由 Heiko Carstens 提交于
Remove the two facility bits 50 - constrained transactional-execution facility 74 - transactional-execution facility from the required facilities if the kernel is built with -march=zEC12. E.g. z/VM 6.3 doesn't virtualize the TX facility yet. Therefore a kernel built with -march=zEC12 and ipl'ed on a zEC12 machine as a z/VM 6.3 guest will emit a message about the missing facilities and stop working. The kernel however doesn't make use of the TX facility, therefore remove the two TX related facility bits and fix this unpleasant behavior. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Reviewed-by: NDavid Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 29 7月, 2015 1 次提交
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由 Martin Schwidefsky 提交于
The 31-bit assembler code for the early sclp console is error prone as git commit fde24b54d976cc123506695c17db01438a11b673 "s390/sclp: clear upper register halves in _sclp_print_early" has shown. Convert the assembler code to C. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 25 3月, 2015 1 次提交
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由 Heiko Carstens 提交于
Remove the 31 bit support in order to reduce maintenance cost and effectively remove dead code. Since a couple of years there is no distribution left that comes with a 31 bit kernel. The 31 bit kernel also has been broken since more than a year before anybody noticed. In addition I added a removal warning to the kernel shown at ipl for 5 minutes: a960062e ("s390: add 31 bit warning message") which let everybody know about the plan to remove 31 bit code. We didn't get any response. Given that the last 31 bit only machine was introduced in 1999 let's remove the code. Anybody with 31 bit user space code can still use the compat mode. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 22 1月, 2015 1 次提交
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由 Martin Schwidefsky 提交于
Allow to generate code that only runs on z13 machines. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 25 9月, 2014 1 次提交
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由 Christian Borntraeger 提交于
The architecture suggests to use address 0 as parameter for stfl, to allow for future extensions. Using __LC_STFL_FAC_LIST (0x200) shows which address is used, but might be not future proof. Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 16 7月, 2014 1 次提交
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由 David Hildenbrand 提交于
Inlined uaccess functions require the mvcos facility (bit 27), not the tod clock steering facility (bit 28) for z10 and newer machines. Signed-off-by: NDavid Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 28 5月, 2014 1 次提交
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由 Heiko Carstens 提交于
Remove the check for the extract-cpu-time facility within early startup code. Both kernel and user space work if the facility is not installed. The vdso code has a run time check if the ectg is available. Besides that there is no known user. Reported-by: NChristian Borntraeger <borntraeger@de.ibm.com> Acked-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 27 5月, 2014 1 次提交
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由 Heiko Carstens 提交于
With inlined uaccess functions we always need the mvcos facility. Checking at each inline place if mvcos is available would make the inlining of get_user/put_user pointless. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 24 10月, 2013 1 次提交
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由 Heiko Carstens 提交于
Since zEC12 we have the interlocked-access facility 2 which allows to use the instructions ni/oi/xi to update a single byte in storage with compare-and-swap semantics. So change set_bit(), clear_bit() and change_bit() to generate such code instead of a compare-and-swap loop (or using the load-and-* instruction family), if possible. This reduces the text segment by yet another 8KB (defconfig). Alternatively the long displacement variants niy/oiy/xiy could have been used, but the extended displacement field is usually not needed and therefore would only increase the size of the text segment again. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 23 11月, 2012 1 次提交
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由 Heiko Carstens 提交于
Allow to generate code that only runs on zEC12 machines. Also add a check which prevents the kernel to run on machines which do not have any of the following new facilities installed: - (48) decimal-floating-point zoned-conversion - (49) execution-hint - (49) load-and-trap - (49) miscellaneous-instruction-extensions - (49) processor-assist - (50) constrained transactional-execution - (73) transactional-execution 48, 49, 50 and 73 are the bit numbers of the facility indications for each of the required facilities. Note that we assume that user-space gets compiled with the same compiler options, therefore we also test for a dfp facility even if the kernel doesn't make use of it. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
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- 09 10月, 2012 1 次提交
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由 Martin Schwidefsky 提交于
Do the switch to z/Architecture (alias 64 bit) mode early in head.S. If the machine is already running in 64 bit mode the sigp turns into a nop. With this change it doesn't matter in which mode the kernel is started. Reviewd-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 20 7月, 2012 1 次提交
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由 Heiko Carstens 提交于
Remove the file name from the comment at top of many files. In most cases the file name was wrong anyway, so it's rather pointless. Also unify the IBM copyright statement. We did have a lot of sightly different statements and wanted to change them one after another whenever a file gets touched. However that never happened. Instead people start to take the old/"wrong" statements to use as a template for new files. So unify all of them in one go. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
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- 16 5月, 2012 1 次提交
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由 Heiko Carstens 提交于
Remove the builtin tape ipl code. If somebody really wants to create a tape which can be ipl'ed from, then this can be achieved by using zipl. zipl can write an ipl record to a tape device and aftwards the kernel image must be written to tape. The steps are described in the "Linux on System z - Device Drivers, Features, and Commands" book (SC33-8411). Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 11 4月, 2012 1 次提交
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由 Michael Holzheu 提交于
The stfle() function writes into lowcore memory when stfl_fac_list is initialized with "S390_lowcore.stfl_fac_list = 0". For older compilers this triggers a lowcore exception. With newer compilers and "-OXX" compile option the bug does not show up because the "S390_lowcore.stfl_fac_list" initialization is removed by the compiler. The reason for thatis the incorrect "=m" (S390_lowcore.stfl_fac_list) constraint in the stfl inline assembly. The following shows the disassembly of the stfle() optimized code that is inlined in the lgr_info_get() function: 000000000011325c <lgr_info_get>: 11325c: eb 9f f0 60 00 24 stmg %r9,%r15,96(%r15) 113262: c0 d0 00 29 0e 47 larl %r13,634ef0 <servi..> 113268: a7 f1 3f c0 tml %r15,16320 11326c: b9 04 00 ef lgr %r14,%r15 113270: a7 84 00 01 je 113272 <lgr_info_g..> 113274: a7 fb ff c0 aghi %r15,-64 113278: b9 04 00 c2 lgr %r12,%r2 11327c: a7 29 00 01 lghi %r2,1 113280: e3 e0 f0 98 00 24 stg %r14,152(%r15) 113286: d7 97 c0 00 c0 00 xc 0(152,%r12),0(%r12) 11328c: c0 e5 00 28 db 4c brasl %r14,62e924 <add_e..> 113292: b2 b1 00 00 stfl 0 To fix the problem we now clear the S390_lowcore.stfl_fac_list at startup in "head.S" for all machine types before lowcore protection is enabled. In addition to that the "=m" constraint is replaced by "+m". Signed-off-by: NMichael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 27 12月, 2011 1 次提交
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由 Martin Schwidefsky 提交于
Another round of cleanup for entry[64].S, in particular the program check handler looks more reasonable now. The code size for the 31 bit kernel has been reduced by 616 byte and by 528 byte for the 64 bit version. Even better the code is a bit faster as well. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 30 10月, 2011 1 次提交
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由 Michael Holzheu 提交于
This patch provides the architecture specific part of the s390 kdump support. Signed-off-by: NMichael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 24 7月, 2011 1 次提交
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由 Jan Glauber 提交于
The alignment is missing for various global symbols in s390 assembly code. With a recent gcc and an instruction like stgrl this can lead to a specification exception if the instruction uses such a mis-aligned address. Specify the alignment explicitely and while add it define __ALIGN for s390 and use the ENTRY define to save some lines of code. Signed-off-by: NJan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 04 4月, 2011 1 次提交
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由 Martin Schwidefsky 提交于
The latest binutils won't accept the stfl instruction with march=g5 which is the correct behaviour. Unfortunately head.S is assembled with -march=g5 even if the target cpu is z900 or later. To get 31-bit kernels compiled again the easiest fix is to use the .insn notation for the stfl instruction in head.S. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 25 10月, 2010 1 次提交
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由 Heiko Carstens 提交于
Add a kernel config option for the IBM zEnterprise 196. This will produce faster code on newer compilers using the -march=z196 option. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 10 8月, 2010 1 次提交
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由 Heiko Carstens 提交于
Change default load address of the initrd in case of IPL from reader. The new load address is directly behind the kernel image. This way we can see immediatly if there are any problems with the code which tries to rescue the initrd in case the bootmem bitmap would overlap with the initrd. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 17 5月, 2010 1 次提交
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由 Martin Schwidefsky 提交于
Remove cpu_id from lowcore and replace addr_t with __u64. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 24 3月, 2010 1 次提交
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由 Martin Schwidefsky 提交于
Fix two bugs with the kernel image compression: 1) reset the bss section of the compressed vmlinux 2) clear the high half of the registers for 64 bit early enough for the decompression step Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 27 2月, 2010 3 次提交
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由 Martin Schwidefsky 提交于
Add the "bzImage" compile target and the necessary code to generate compressed kernel images. The old style uncompressed "image" target is preserved, a simple make will build them both. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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由 Martin Schwidefsky 提交于
Move the ebcdic to ascii conversion of the kernel parameter line from head.S to early.c and convert the assembler code to C. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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由 Heiko Carstens 提交于
Use asm offsets to make sure the offset defines to struct _lowcore and its layout don't get out of sync. Also add a BUILD_BUG_ON() which checks that the size of the structure is sane. And while being at it change those sites which use odd casts to access the current lowcore. These should use S390_lowcore instead. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 11 9月, 2009 1 次提交
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由 Heiko Carstens 提交于
Saves us more than 65k pointless IPIs. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 13 6月, 2009 1 次提交
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由 Martin Olsson 提交于
trivial: fix typos s/paramter/parameter/ and s/excute/execute/ in documentation and source comments. Signed-off-by: NMartin Olsson <martin@minimum.se> Signed-off-by: NJiri Kosina <jkosina@suse.cz>
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- 12 6月, 2009 2 次提交
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由 Heiko Carstens 提交于
This adds a mini sclp device driver for very early use. The primary and probably only use will be to emit a message to the console if the cpu doesn't provide the minimum required capabilities to run the kernel. After printing the message a disabled wait will be loaded and the machine stops operating. Printing the message is also part of this patch. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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由 Martin Schwidefsky 提交于
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 27 4月, 2009 1 次提交
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由 Tim Abbott 提交于
This has the consequence of changing the section name use for head code from ".text.head" to ".head.text". Since this commit changes all users in the architecture, this change should be harmless. Signed-off-by: NTim Abbott <tabbott@mit.edu> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Acked-by: NSam Ravnborg <sam@ravnborg.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 14 4月, 2009 2 次提交
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由 Martin Schwidefsky 提交于
Start the cpu time accounting very early to catch the cpu time spent for the initial kernel setup. To make the output of /proc/uptime match the sum of all cpu accounting values of the boot cpu reset xtime and wall_to_monotonic to sane values based on the TOD clock. The values set by timekeeping_init are off by up to a second. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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由 Martin Schwidefsky 提交于
Add a read_persistent_clock function that does not just return 0. Since timekeeping_init calls the function before time_init has been called move reset_tod_clock to early.c to make sure that the TOD clock is running when read_persistent_clock is invoked. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 26 3月, 2009 1 次提交
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由 Martin Schwidefsky 提交于
The lowcore.h header has quite a lot of whitespace damage and a rather wild collection of entries. Remove all that whitespace and tidy up the order of the lowcore fields. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 25 12月, 2008 1 次提交
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由 Martin Schwidefsky 提交于
This patch adds the code generation option for IBM System z10 and adds a check in head[31,64].S to prevents the execution of a kernel compiled for a new processor type on an old machine. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 27 7月, 2007 1 次提交
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由 Heiko Carstens 提交于
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 04 12月, 2006 1 次提交
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由 Christian Borntraeger 提交于
The SALIPL entry point has an needless memory detection routine as we later check the memory size again. The SALIPL code also uses diagnose 0x060 if we are running under VM, but this diagnose is not compatible with the 64 bit addressing mode. The solution is to get rid of this code and rely on the memory detection in the startup code. Signed-off-by: NChristian Borntraeger <cborntra@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 28 9月, 2006 1 次提交
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由 Heiko Carstens 提交于
Huge s390 assembly files whitespace cleanup. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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