forked from luck/tmp_suning_uos_patched
dd43bfca43
We used address 0x1084 instead of 0x84 to store the suspend CPU address. With this patch we use the correct address 0x84 as it is defined in the POP. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
277 lines
6.8 KiB
ArmAsm
277 lines
6.8 KiB
ArmAsm
/*
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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 <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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/*
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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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.section .text
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.align 4
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.globl swsusp_arch_suspend
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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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/* 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 */
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llgf %r4,__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_CPU_ADDRESS(%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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stfpc 0x31c(%r1) /* store fpu control */
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std 0,0x200(%r1) /* store f0 */
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std 1,0x208(%r1) /* store f1 */
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std 2,0x210(%r1) /* store f2 */
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std 3,0x218(%r1) /* store f3 */
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std 4,0x220(%r1) /* store f4 */
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std 5,0x228(%r1) /* store f5 */
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std 6,0x230(%r1) /* store f6 */
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std 7,0x238(%r1) /* store f7 */
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std 8,0x240(%r1) /* store f8 */
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std 9,0x248(%r1) /* store f9 */
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std 10,0x250(%r1) /* store f10 */
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std 11,0x258(%r1) /* store f11 */
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std 12,0x260(%r1) /* store f12 */
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std 13,0x268(%r1) /* store f13 */
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std 14,0x270(%r1) /* store f14 */
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std 15,0x278(%r1) /* store f15 */
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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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lghi %r2,0
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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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/* 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 %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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.globl swsusp_arch_resume
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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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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 %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,%r0,0x12
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sam64
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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_CPU_ADDRESS(%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_RESTART_PSW(16,%r0),0(%r4)
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3:
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sigp %r9,%r1,__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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ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER)
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larl %r2,.Lpanic_string
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larl %r3,_sclp_print_early
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lghi %r1,0
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sam31
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sigp %r1,%r0,0x12
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basr %r14,%r3
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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 /* start 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 /* stop resume (current) CPU */
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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 /* Wait for resume CPU */
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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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lfpc 0x31c(%r13) /* load fpu control */
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ld 0,0x200(%r13) /* load f0 */
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ld 1,0x208(%r13) /* load f1 */
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ld 2,0x210(%r13) /* load f2 */
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ld 3,0x218(%r13) /* load f3 */
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ld 4,0x220(%r13) /* load f4 */
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ld 5,0x228(%r13) /* load f5 */
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ld 6,0x230(%r13) /* load f6 */
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ld 7,0x238(%r13) /* load f7 */
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ld 8,0x240(%r13) /* load f8 */
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ld 9,0x248(%r13) /* load f9 */
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ld 10,0x250(%r13) /* load f10 */
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ld 11,0x258(%r13) /* load f11 */
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ld 12,0x260(%r13) /* load f12 */
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ld 13,0x268(%r13) /* load f13 */
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ld 14,0x270(%r13) /* load f14 */
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ld 15,0x278(%r13) /* load f15 */
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/* Load old stack */
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lg %r15,0x2f8(%r13)
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/* Restore prefix register */
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spx 0x318(%r13)
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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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/* 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 %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"
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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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