/* * S390 64-bit swsusp implementation * * Copyright IBM Corp. 2009 * * Author(s): Hans-Joachim Picht * Michael Holzheu */ #include #include #include #include /* * 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 4 .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 /* Store prefix register on stack */ stpx __SF_EMPTY(%r15) /* Save prefix register contents for lowcore */ llgf %r4,__SF_EMPTY(%r15) /* Get pointer to save area */ lghi %r1,0x1000 /* Save CPU address */ stap __LC_CPU_ADDRESS(%r0) /* 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 */ stck __SF_EMPTY(%r15) /* store clock */ stckc 0x330(%r1) /* store clock comparator */ /* Update cputime accounting before going to sleep */ lg %r0,__LC_LAST_UPDATE_TIMER slg %r0,0x328(%r1) alg %r0,__LC_SYSTEM_TIMER stg %r0,__LC_SYSTEM_TIMER mvc __LC_LAST_UPDATE_TIMER(8),0x328(%r1) lg %r0,__LC_LAST_UPDATE_CLOCK slg %r0,__SF_EMPTY(%r15) alg %r0,__LC_STEAL_TIMER stg %r0,__LC_STEAL_TIMER mvc __LC_LAST_UPDATE_CLOCK(8),__SF_EMPTY(%r15) /* Activate DAT */ stosm __SF_EMPTY(%r15),0x04 /* Set prefix page to zero */ xc __SF_EMPTY(4,%r15),__SF_EMPTY(%r15) spx __SF_EMPTY(%r15) lghi %r2,0 lghi %r3,2*PAGE_SIZE lghi %r5,2*PAGE_SIZE 1: mvcle %r2,%r4,0 jo 1b /* Save image */ brasl %r14,swsusp_save /* 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) /* Make all free pages stable */ lghi %r2,1 brasl %r14,arch_set_page_states /* Deactivate DAT */ stnsm __SF_EMPTY(%r15),0xfb /* 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 */ /* Reset System */ larl %r1,restart_entry larl %r2,.Lrestart_diag308_psw og %r1,0(%r2) stg %r1,0(%r0) larl %r1,.Lnew_pgm_check_psw epsw %r2,%r3 stm %r2,%r3,0(%r1) mvc __LC_PGM_NEW_PSW(16,%r0),0(%r1) lghi %r0,0 diag %r0,%r0,0x308 restart_entry: lhi %r1,1 sigp %r1,%r0,0x12 sam64 larl %r1,.Lnew_pgm_check_psw lpswe 0(%r1) pgm_check_entry: /* Switch to original suspend CPU */ larl %r1,.Lresume_cpu /* Resume CPU address: r2 */ stap 0(%r1) llgh %r2,0(%r1) llgh %r1,__LC_CPU_ADDRESS(%r0) /* Suspend CPU address: r1 */ cgr %r1,%r2 je restore_registers /* r1 = r2 -> nothing to do */ larl %r4,.Lrestart_suspend_psw /* Set new restart PSW */ mvc __LC_RESTART_PSW(16,%r0),0(%r4) 3: sigp %r9,%r1,__SIGP_INITIAL_CPU_RESET brc 8,4f /* accepted */ brc 2,3b /* busy, try again */ /* Suspend CPU not available -> panic */ larl %r15,init_thread_union ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) larl %r2,.Lpanic_string larl %r3,_sclp_print_early lghi %r1,0 sam31 sigp %r1,%r0,0x12 basr %r14,%r3 larl %r3,.Ldisabled_wait_31 lpsw 0(%r3) 4: /* Switch to suspend CPU */ sigp %r9,%r1,__SIGP_RESTART /* start suspend CPU */ brc 2,4b /* busy, try again */ 5: sigp %r9,%r2,__SIGP_STOP /* stop resume (current) CPU */ brc 2,5b /* busy, try again */ 6: j 6b restart_suspend: larl %r1,.Lresume_cpu llgh %r2,0(%r1) 7: sigp %r9,%r2,__SIGP_SENSE /* Wait for resume CPU */ brc 2,7b /* busy, try again */ tmll %r9,0x40 /* Test if resume CPU is stopped */ jz 7b restore_registers: /* Restore registers */ lghi %r13,0x1000 /* %r1 = pointer to save area */ /* Ignore time spent in suspended state. */ llgf %r1,0x318(%r13) stck __LC_LAST_UPDATE_CLOCK(%r1) 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) /* Restore prefix register */ spx 0x318(%r13) /* Activate DAT */ stosm __SF_EMPTY(%r15),0x04 /* Make all free pages unstable */ lghi %r2,0 brasl %r14,arch_set_page_states /* Return 0 */ lmg %r6,%r15,STACK_FRAME_OVERHEAD + __SF_GPRS(%r15) lghi %r2,0 br %r14 .section .data.nosave,"aw",@progbits .align 8 .Ldisabled_wait_31: .long 0x000a0000,0x00000000 .Lpanic_string: .asciz "Resume not possible because suspend CPU is no longer available" .align 8 .Lrestart_diag308_psw: .long 0x00080000,0x80000000 .Lrestart_suspend_psw: .quad 0x0000000180000000,restart_suspend .Lnew_pgm_check_psw: .quad 0,pgm_check_entry .Lresume_cpu: .byte 0,0