diff options
Diffstat (limited to 'arch/s390/power')
-rw-r--r-- | arch/s390/power/Makefile | 8 | ||||
-rw-r--r-- | arch/s390/power/suspend.c | 40 | ||||
-rw-r--r-- | arch/s390/power/swsusp.c | 30 | ||||
-rw-r--r-- | arch/s390/power/swsusp_64.c | 17 | ||||
-rw-r--r-- | arch/s390/power/swsusp_asm64.S | 199 |
5 files changed, 294 insertions, 0 deletions
diff --git a/arch/s390/power/Makefile b/arch/s390/power/Makefile new file mode 100644 index 00000000000..973bb45a8fe --- /dev/null +++ b/arch/s390/power/Makefile @@ -0,0 +1,8 @@ +# +# Makefile for s390 PM support +# + +obj-$(CONFIG_HIBERNATION) += suspend.o +obj-$(CONFIG_HIBERNATION) += swsusp.o +obj-$(CONFIG_HIBERNATION) += swsusp_64.o +obj-$(CONFIG_HIBERNATION) += swsusp_asm64.o diff --git a/arch/s390/power/suspend.c b/arch/s390/power/suspend.c new file mode 100644 index 00000000000..b3351eceebb --- /dev/null +++ b/arch/s390/power/suspend.c @@ -0,0 +1,40 @@ +/* + * Suspend support specific for s390. + * + * Copyright IBM Corp. 2009 + * + * Author(s): Hans-Joachim Picht <hans@linux.vnet.ibm.com> + */ + +#include <linux/mm.h> +#include <linux/suspend.h> +#include <linux/reboot.h> +#include <linux/pfn.h> +#include <asm/sections.h> +#include <asm/ipl.h> + +/* + * References to section boundaries + */ +extern const void __nosave_begin, __nosave_end; + +/* + * check if given pfn is in the 'nosave' or in the read only NSS section + */ +int pfn_is_nosave(unsigned long pfn) +{ + unsigned long nosave_begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT; + unsigned long nosave_end_pfn = PAGE_ALIGN(__pa(&__nosave_end)) + >> PAGE_SHIFT; + unsigned long eshared_pfn = PFN_DOWN(__pa(&_eshared)) - 1; + unsigned long stext_pfn = PFN_DOWN(__pa(&_stext)); + + if (pfn >= nosave_begin_pfn && pfn < nosave_end_pfn) + return 1; + if (pfn >= stext_pfn && pfn <= eshared_pfn) { + if (ipl_info.type == IPL_TYPE_NSS) + return 1; + } else if ((tprot(pfn * PAGE_SIZE) && pfn > 0)) + return 1; + return 0; +} diff --git a/arch/s390/power/swsusp.c b/arch/s390/power/swsusp.c new file mode 100644 index 00000000000..e6a4fe9f5f2 --- /dev/null +++ b/arch/s390/power/swsusp.c @@ -0,0 +1,30 @@ +/* + * Support for suspend and resume on s390 + * + * Copyright IBM Corp. 2009 + * + * Author(s): Hans-Joachim Picht <hans@linux.vnet.ibm.com> + * + */ + + +/* + * save CPU registers before creating a hibernation image and before + * restoring the memory state from it + */ +void save_processor_state(void) +{ + /* implentation contained in the + * swsusp_arch_suspend function + */ +} + +/* + * restore the contents of CPU registers + */ +void restore_processor_state(void) +{ + /* implentation contained in the + * swsusp_arch_resume function + */ +} diff --git a/arch/s390/power/swsusp_64.c b/arch/s390/power/swsusp_64.c new file mode 100644 index 00000000000..9516a517d72 --- /dev/null +++ b/arch/s390/power/swsusp_64.c @@ -0,0 +1,17 @@ +/* + * Support for suspend and resume on s390 + * + * Copyright IBM Corp. 2009 + * + * Author(s): Hans-Joachim Picht <hans@linux.vnet.ibm.com> + * + */ + +#include <asm/system.h> +#include <linux/interrupt.h> + +void do_after_copyback(void) +{ + mb(); +} + diff --git a/arch/s390/power/swsusp_asm64.S b/arch/s390/power/swsusp_asm64.S new file mode 100644 index 00000000000..3c74e7d827c --- /dev/null +++ b/arch/s390/power/swsusp_asm64.S @@ -0,0 +1,199 @@ +/* + * S390 64-bit swsusp implementation + * + * Copyright IBM Corp. 2009 + * + * Author(s): Hans-Joachim Picht <hans@linux.vnet.ibm.com> + * Michael Holzheu <holzheu@linux.vnet.ibm.com> + */ + +#include <asm/page.h> +#include <asm/ptrace.h> +#include <asm/asm-offsets.h> + +/* + * Save register context in absolute 0 lowcore and call swsusp_save() to + * create in-memory kernel image. The context is saved in the designated + * "store status" memory locations (see POP). + * We return from this function twice. The first time during the suspend to + * disk process. The second time via the swsusp_arch_resume() function + * (see below) in the resume process. + * This function runs with disabled interrupts. + */ + .section .text + .align 2 + .globl swsusp_arch_suspend +swsusp_arch_suspend: + stmg %r6,%r15,__SF_GPRS(%r15) + lgr %r1,%r15 + aghi %r15,-STACK_FRAME_OVERHEAD + stg %r1,__SF_BACKCHAIN(%r15) + + /* Deactivate DAT */ + stnsm __SF_EMPTY(%r15),0xfb + + /* Switch off lowcore protection */ + stctg %c0,%c0,__SF_EMPTY(%r15) + ni __SF_EMPTY+4(%r15),0xef + lctlg %c0,%c0,__SF_EMPTY(%r15) + + /* Store prefix register on stack */ + stpx __SF_EMPTY(%r15) + + /* Setup base register for lowcore (absolute 0) */ + llgf %r1,__SF_EMPTY(%r15) + + /* Get pointer to save area */ + aghi %r1,0x1000 + + /* Store registers */ + mvc 0x318(4,%r1),__SF_EMPTY(%r15) /* move prefix to lowcore */ + stfpc 0x31c(%r1) /* store fpu control */ + std 0,0x200(%r1) /* store f0 */ + std 1,0x208(%r1) /* store f1 */ + std 2,0x210(%r1) /* store f2 */ + std 3,0x218(%r1) /* store f3 */ + std 4,0x220(%r1) /* store f4 */ + std 5,0x228(%r1) /* store f5 */ + std 6,0x230(%r1) /* store f6 */ + std 7,0x238(%r1) /* store f7 */ + std 8,0x240(%r1) /* store f8 */ + std 9,0x248(%r1) /* store f9 */ + std 10,0x250(%r1) /* store f10 */ + std 11,0x258(%r1) /* store f11 */ + std 12,0x260(%r1) /* store f12 */ + std 13,0x268(%r1) /* store f13 */ + std 14,0x270(%r1) /* store f14 */ + std 15,0x278(%r1) /* store f15 */ + stam %a0,%a15,0x340(%r1) /* store access registers */ + stctg %c0,%c15,0x380(%r1) /* store control registers */ + stmg %r0,%r15,0x280(%r1) /* store general registers */ + + stpt 0x328(%r1) /* store timer */ + stckc 0x330(%r1) /* store clock comparator */ + + /* Activate DAT */ + stosm __SF_EMPTY(%r15),0x04 + + /* Set prefix page to zero */ + xc __SF_EMPTY(4,%r15),__SF_EMPTY(%r15) + spx __SF_EMPTY(%r15) + + /* Setup lowcore */ + brasl %r14,setup_lowcore_early + + /* Save image */ + brasl %r14,swsusp_save + + /* Switch on lowcore protection */ + stctg %c0,%c0,__SF_EMPTY(%r15) + oi __SF_EMPTY+4(%r15),0x10 + lctlg %c0,%c0,__SF_EMPTY(%r15) + + /* Restore prefix register and return */ + lghi %r1,0x1000 + spx 0x318(%r1) + lmg %r6,%r15,STACK_FRAME_OVERHEAD + __SF_GPRS(%r15) + lghi %r2,0 + br %r14 + +/* + * Restore saved memory image to correct place and restore register context. + * Then we return to the function that called swsusp_arch_suspend(). + * swsusp_arch_resume() runs with disabled interrupts. + */ + .globl swsusp_arch_resume +swsusp_arch_resume: + stmg %r6,%r15,__SF_GPRS(%r15) + lgr %r1,%r15 + aghi %r15,-STACK_FRAME_OVERHEAD + stg %r1,__SF_BACKCHAIN(%r15) + + /* Save boot cpu number */ + brasl %r14,smp_get_phys_cpu_id + lgr %r10,%r2 + + /* Deactivate DAT */ + stnsm __SF_EMPTY(%r15),0xfb + + /* Switch off lowcore protection */ + stctg %c0,%c0,__SF_EMPTY(%r15) + ni __SF_EMPTY+4(%r15),0xef + lctlg %c0,%c0,__SF_EMPTY(%r15) + + /* Set prefix page to zero */ + xc __SF_EMPTY(4,%r15),__SF_EMPTY(%r15) + spx __SF_EMPTY(%r15) + + /* Restore saved image */ + larl %r1,restore_pblist + lg %r1,0(%r1) + ltgr %r1,%r1 + jz 2f +0: + lg %r2,8(%r1) + lg %r4,0(%r1) + lghi %r3,PAGE_SIZE + lghi %r5,PAGE_SIZE +1: + mvcle %r2,%r4,0 + jo 1b + lg %r1,16(%r1) + ltgr %r1,%r1 + jnz 0b +2: + ptlb /* flush tlb */ + + /* Restore registers */ + lghi %r13,0x1000 /* %r1 = pointer to save arae */ + + spt 0x328(%r13) /* reprogram timer */ + //sckc 0x330(%r13) /* set clock comparator */ + + lctlg %c0,%c15,0x380(%r13) /* load control registers */ + lam %a0,%a15,0x340(%r13) /* load access registers */ + + lfpc 0x31c(%r13) /* load fpu control */ + ld 0,0x200(%r13) /* load f0 */ + ld 1,0x208(%r13) /* load f1 */ + ld 2,0x210(%r13) /* load f2 */ + ld 3,0x218(%r13) /* load f3 */ + ld 4,0x220(%r13) /* load f4 */ + ld 5,0x228(%r13) /* load f5 */ + ld 6,0x230(%r13) /* load f6 */ + ld 7,0x238(%r13) /* load f7 */ + ld 8,0x240(%r13) /* load f8 */ + ld 9,0x248(%r13) /* load f9 */ + ld 10,0x250(%r13) /* load f10 */ + ld 11,0x258(%r13) /* load f11 */ + ld 12,0x260(%r13) /* load f12 */ + ld 13,0x268(%r13) /* load f13 */ + ld 14,0x270(%r13) /* load f14 */ + ld 15,0x278(%r13) /* load f15 */ + + /* Load old stack */ + lg %r15,0x2f8(%r13) + + /* Pointer to save arae */ + lghi %r13,0x1000 + + /* Switch CPUs */ + lgr %r2,%r10 /* get cpu id */ + llgf %r3,0x318(%r13) + brasl %r14,smp_switch_boot_cpu_in_resume + + /* Restore prefix register */ + spx 0x318(%r13) + + /* Switch on lowcore protection */ + stctg %c0,%c0,__SF_EMPTY(%r15) + oi __SF_EMPTY+4(%r15),0x10 + lctlg %c0,%c0,__SF_EMPTY(%r15) + + /* Activate DAT */ + stosm __SF_EMPTY(%r15),0x04 + + /* Return 0 */ + lmg %r6,%r15,STACK_FRAME_OVERHEAD + __SF_GPRS(%r15) + lghi %r2,0 + br %r14 |