diff options
author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2009-09-11 04:28:37 -0400 |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-09-11 04:29:45 -0400 |
commit | c48ff644f2c86f34f69f382b68b16c6d30854783 (patch) | |
tree | 606db1e957310db21f293f621f1bae08714ec285 /arch/s390/kernel/suspend.c | |
parent | f3d1263e81daf2be1353baf1ad3f6e25d135f2c5 (diff) |
[S390] hibernation: merge files and move to kernel/
Merge the nearly empty C files and move everything from power/ to
kernel/. That way the files are easier to handle.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/suspend.c')
-rw-r--r-- | arch/s390/kernel/suspend.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/s390/kernel/suspend.c b/arch/s390/kernel/suspend.c new file mode 100644 index 000000000000..086bee970cae --- /dev/null +++ b/arch/s390/kernel/suspend.c | |||
@@ -0,0 +1,73 @@ | |||
1 | /* | ||
2 | * Suspend support specific for s390. | ||
3 | * | ||
4 | * Copyright IBM Corp. 2009 | ||
5 | * | ||
6 | * Author(s): Hans-Joachim Picht <hans@linux.vnet.ibm.com> | ||
7 | */ | ||
8 | |||
9 | #include <linux/suspend.h> | ||
10 | #include <linux/reboot.h> | ||
11 | #include <linux/pfn.h> | ||
12 | #include <linux/mm.h> | ||
13 | #include <asm/sections.h> | ||
14 | #include <asm/system.h> | ||
15 | #include <asm/ipl.h> | ||
16 | |||
17 | /* | ||
18 | * References to section boundaries | ||
19 | */ | ||
20 | extern const void __nosave_begin, __nosave_end; | ||
21 | |||
22 | /* | ||
23 | * check if given pfn is in the 'nosave' or in the read only NSS section | ||
24 | */ | ||
25 | int pfn_is_nosave(unsigned long pfn) | ||
26 | { | ||
27 | unsigned long nosave_begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT; | ||
28 | unsigned long nosave_end_pfn = PAGE_ALIGN(__pa(&__nosave_end)) | ||
29 | >> PAGE_SHIFT; | ||
30 | unsigned long eshared_pfn = PFN_DOWN(__pa(&_eshared)) - 1; | ||
31 | unsigned long stext_pfn = PFN_DOWN(__pa(&_stext)); | ||
32 | |||
33 | if (pfn >= nosave_begin_pfn && pfn < nosave_end_pfn) | ||
34 | return 1; | ||
35 | if (pfn >= stext_pfn && pfn <= eshared_pfn) { | ||
36 | if (ipl_info.type == IPL_TYPE_NSS) | ||
37 | return 1; | ||
38 | } else if ((tprot(pfn * PAGE_SIZE) && pfn > 0)) | ||
39 | return 1; | ||
40 | return 0; | ||
41 | } | ||
42 | |||
43 | void save_processor_state(void) | ||
44 | { | ||
45 | /* swsusp_arch_suspend() actually saves all cpu register contents. | ||
46 | * Machine checks must be disabled since swsusp_arch_suspend() stores | ||
47 | * register contents to their lowcore save areas. That's the same | ||
48 | * place where register contents on machine checks would be saved. | ||
49 | * To avoid register corruption disable machine checks. | ||
50 | * We must also disable machine checks in the new psw mask for | ||
51 | * program checks, since swsusp_arch_suspend() may generate program | ||
52 | * checks. Disabling machine checks for all other new psw masks is | ||
53 | * just paranoia. | ||
54 | */ | ||
55 | local_mcck_disable(); | ||
56 | /* Disable lowcore protection */ | ||
57 | __ctl_clear_bit(0,28); | ||
58 | S390_lowcore.external_new_psw.mask &= ~PSW_MASK_MCHECK; | ||
59 | S390_lowcore.svc_new_psw.mask &= ~PSW_MASK_MCHECK; | ||
60 | S390_lowcore.io_new_psw.mask &= ~PSW_MASK_MCHECK; | ||
61 | S390_lowcore.program_new_psw.mask &= ~PSW_MASK_MCHECK; | ||
62 | } | ||
63 | |||
64 | void restore_processor_state(void) | ||
65 | { | ||
66 | S390_lowcore.external_new_psw.mask |= PSW_MASK_MCHECK; | ||
67 | S390_lowcore.svc_new_psw.mask |= PSW_MASK_MCHECK; | ||
68 | S390_lowcore.io_new_psw.mask |= PSW_MASK_MCHECK; | ||
69 | S390_lowcore.program_new_psw.mask |= PSW_MASK_MCHECK; | ||
70 | /* Enable lowcore protection */ | ||
71 | __ctl_set_bit(0,28); | ||
72 | local_mcck_enable(); | ||
73 | } | ||