/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* S390 64-bit swsusp implementation
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*
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* Copyright IBM Corp. 2009
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*
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* Author(s): Hans-Joachim Picht <hans@linux.vnet.ibm.com>
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* Michael Holzheu <holzheu@linux.vnet.ibm.com>
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*/
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#include <linux/linkage.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include <asm/thread_info.h>
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#include <asm/asm-offsets.h>
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#include <asm/nospec-insn.h>
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#include <asm/sigp.h>
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/*
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* Save register context in absolute 0 lowcore and call swsusp_save() to
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* create in-memory kernel image. The context is saved in the designated
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* "store status" memory locations (see POP).
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* We return from this function twice. The first time during the suspend to
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* disk process. The second time via the swsusp_arch_resume() function
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* (see below) in the resume process.
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* This function runs with disabled interrupts.
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*/
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GEN_BR_THUNK %r14
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.section .text
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ENTRY(swsusp_arch_suspend)
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stmg %r6,%r15,__SF_GPRS(%r15)
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lgr %r1,%r15
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aghi %r15,-STACK_FRAME_OVERHEAD
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stg %r1,__SF_BACKCHAIN(%r15)
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/* Store FPU registers */
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brasl %r14,save_fpu_regs
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/* Deactivate DAT */
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stnsm __SF_EMPTY(%r15),0xfb
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/* Store prefix register on stack */
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stpx __SF_EMPTY(%r15)
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/* Save prefix register contents for lowcore copy */
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llgf %r10,__SF_EMPTY(%r15)
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/* Get pointer to save area */
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lghi %r1,0x1000
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/* Save CPU address */
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stap __LC_EXT_CPU_ADDR(%r0)
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/* Store registers */
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mvc 0x318(4,%r1),__SF_EMPTY(%r15) /* move prefix to lowcore */
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stam %a0,%a15,0x340(%r1) /* store access registers */
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stctg %c0,%c15,0x380(%r1) /* store control registers */
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stmg %r0,%r15,0x280(%r1) /* store general registers */
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stpt 0x328(%r1) /* store timer */
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stck __SF_EMPTY(%r15) /* store clock */
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stckc 0x330(%r1) /* store clock comparator */
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/* Update cputime accounting before going to sleep */
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lg %r0,__LC_LAST_UPDATE_TIMER
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slg %r0,0x328(%r1)
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alg %r0,__LC_SYSTEM_TIMER
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stg %r0,__LC_SYSTEM_TIMER
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mvc __LC_LAST_UPDATE_TIMER(8),0x328(%r1)
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lg %r0,__LC_LAST_UPDATE_CLOCK
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slg %r0,__SF_EMPTY(%r15)
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alg %r0,__LC_STEAL_TIMER
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stg %r0,__LC_STEAL_TIMER
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mvc __LC_LAST_UPDATE_CLOCK(8),__SF_EMPTY(%r15)
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/* Activate DAT */
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stosm __SF_EMPTY(%r15),0x04
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/* Set prefix page to zero */
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xc __SF_EMPTY(4,%r15),__SF_EMPTY(%r15)
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spx __SF_EMPTY(%r15)
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/* Save absolute zero pages */
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larl %r2,suspend_zero_pages
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lg %r2,0(%r2)
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lghi %r4,0
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lghi %r3,2*PAGE_SIZE
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lghi %r5,2*PAGE_SIZE
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1: mvcle %r2,%r4,0
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jo 1b
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/* Copy lowcore to absolute zero lowcore */
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lghi %r2,0
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lgr %r4,%r10
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lghi %r3,2*PAGE_SIZE
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lghi %r5,2*PAGE_SIZE
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1: mvcle %r2,%r4,0
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jo 1b
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/* Save image */
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brasl %r14,swsusp_save
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/* Restore prefix register and return */
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lghi %r1,0x1000
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spx 0x318(%r1)
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lmg %r6,%r15,STACK_FRAME_OVERHEAD + __SF_GPRS(%r15)
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lghi %r2,0
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BR_EX %r14
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/*
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* Restore saved memory image to correct place and restore register context.
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* Then we return to the function that called swsusp_arch_suspend().
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* swsusp_arch_resume() runs with disabled interrupts.
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*/
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ENTRY(swsusp_arch_resume)
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stmg %r6,%r15,__SF_GPRS(%r15)
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lgr %r1,%r15
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aghi %r15,-STACK_FRAME_OVERHEAD
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stg %r1,__SF_BACKCHAIN(%r15)
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/* Make all free pages stable */
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lghi %r2,1
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brasl %r14,arch_set_page_states
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/* Deactivate DAT */
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stnsm __SF_EMPTY(%r15),0xfb
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/* Set prefix page to zero */
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xc __SF_EMPTY(4,%r15),__SF_EMPTY(%r15)
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spx __SF_EMPTY(%r15)
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/* Restore saved image */
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larl %r1,restore_pblist
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lg %r1,0(%r1)
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ltgr %r1,%r1
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jz 2f
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0:
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lg %r2,8(%r1)
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lg %r4,0(%r1)
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iske %r0,%r4
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lghi %r3,PAGE_SIZE
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lghi %r5,PAGE_SIZE
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1:
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mvcle %r2,%r4,0
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jo 1b
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lg %r2,8(%r1)
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sske %r0,%r2
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lg %r1,16(%r1)
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ltgr %r1,%r1
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jnz 0b
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2:
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ptlb /* flush tlb */
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/* Reset System */
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larl %r1,restart_entry
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larl %r2,.Lrestart_diag308_psw
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og %r1,0(%r2)
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stg %r1,0(%r0)
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larl %r1,.Lnew_pgm_check_psw
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epsw %r2,%r3
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stm %r2,%r3,0(%r1)
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mvc __LC_PGM_NEW_PSW(16,%r0),0(%r1)
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lghi %r0,0
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diag %r0,%r0,0x308
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restart_entry:
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lhi %r1,1
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sigp %r1,%r0,SIGP_SET_ARCHITECTURE
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sam64
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#ifdef CONFIG_SMP
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larl %r1,smp_cpu_mt_shift
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icm %r1,15,0(%r1)
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jz smt_done
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llgfr %r1,%r1
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smt_loop:
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sigp %r1,%r0,SIGP_SET_MULTI_THREADING
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brc 8,smt_done /* accepted */
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brc 2,smt_loop /* busy, try again */
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smt_done:
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#endif
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larl %r1,.Lnew_pgm_check_psw
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lpswe 0(%r1)
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pgm_check_entry:
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/* Switch to original suspend CPU */
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larl %r1,.Lresume_cpu /* Resume CPU address: r2 */
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stap 0(%r1)
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llgh %r2,0(%r1)
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llgh %r1,__LC_EXT_CPU_ADDR(%r0) /* Suspend CPU address: r1 */
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cgr %r1,%r2
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je restore_registers /* r1 = r2 -> nothing to do */
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larl %r4,.Lrestart_suspend_psw /* Set new restart PSW */
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mvc __LC_RST_NEW_PSW(16,%r0),0(%r4)
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3:
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sigp %r9,%r1,SIGP_INITIAL_CPU_RESET /* sigp initial cpu reset */
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brc 8,4f /* accepted */
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brc 2,3b /* busy, try again */
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/* Suspend CPU not available -> panic */
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larl %r15,init_thread_union
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aghi %r15,1<<(PAGE_SHIFT+THREAD_SIZE_ORDER)
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aghi %r15,-STACK_FRAME_OVERHEAD
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larl %r2,.Lpanic_string
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brasl %r14,sclp_early_printk_force
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larl %r3,.Ldisabled_wait_31
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lpsw 0(%r3)
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4:
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/* Switch to suspend CPU */
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sigp %r9,%r1,SIGP_RESTART /* sigp restart to suspend CPU */
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brc 2,4b /* busy, try again */
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5:
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sigp %r9,%r2,SIGP_STOP /* sigp stop to current resume CPU */
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brc 2,5b /* busy, try again */
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6: j 6b
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restart_suspend:
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larl %r1,.Lresume_cpu
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llgh %r2,0(%r1)
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7:
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sigp %r9,%r2,SIGP_SENSE /* sigp sense, wait for resume CPU */
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brc 8,7b /* accepted, status 0, still running */
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brc 2,7b /* busy, try again */
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tmll %r9,0x40 /* Test if resume CPU is stopped */
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jz 7b
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restore_registers:
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/* Restore registers */
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lghi %r13,0x1000 /* %r1 = pointer to save area */
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/* Ignore time spent in suspended state. */
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llgf %r1,0x318(%r13)
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stck __LC_LAST_UPDATE_CLOCK(%r1)
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spt 0x328(%r13) /* reprogram timer */
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//sckc 0x330(%r13) /* set clock comparator */
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lctlg %c0,%c15,0x380(%r13) /* load control registers */
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lam %a0,%a15,0x340(%r13) /* load access registers */
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/* Load old stack */
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lg %r15,0x2f8(%r13)
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/* Save prefix register */
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mvc __SF_EMPTY(4,%r15),0x318(%r13)
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/* Restore absolute zero pages */
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lghi %r2,0
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larl %r4,suspend_zero_pages
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lg %r4,0(%r4)
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lghi %r3,2*PAGE_SIZE
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lghi %r5,2*PAGE_SIZE
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1: mvcle %r2,%r4,0
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jo 1b
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/* Restore prefix register */
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spx __SF_EMPTY(%r15)
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/* Activate DAT */
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stosm __SF_EMPTY(%r15),0x04
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/* Make all free pages unstable */
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lghi %r2,0
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brasl %r14,arch_set_page_states
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/* Call arch specific early resume code */
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brasl %r14,s390_early_resume
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/* Return 0 */
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lmg %r6,%r15,STACK_FRAME_OVERHEAD + __SF_GPRS(%r15)
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lghi %r2,0
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BR_EX %r14
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.section .data..nosave,"aw",@progbits
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.align 8
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.Ldisabled_wait_31:
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.long 0x000a0000,0x00000000
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.Lpanic_string:
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.asciz "Resume not possible because suspend CPU is no longer available\n"
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.align 8
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.Lrestart_diag308_psw:
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.long 0x00080000,0x80000000
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.Lrestart_suspend_psw:
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.quad 0x0000000180000000,restart_suspend
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.Lnew_pgm_check_psw:
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.quad 0,pgm_check_entry
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.Lresume_cpu:
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.byte 0,0
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