diff options
Diffstat (limited to 'arch/s390/kernel/entry.S')
| -rw-r--r-- | arch/s390/kernel/entry.S | 159 |
1 files changed, 88 insertions, 71 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 3705700..74ee563 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -2,7 +2,7 @@ * arch/s390/kernel/entry.S * S390 low-level entry points. * - * Copyright (C) IBM Corp. 1999,2006 + * Copyright (C) IBM Corp. 1999,2012 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), * Hartmut Penner (hp@de.ibm.com), * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), @@ -105,14 +105,14 @@ STACK_SIZE = 1 << STACK_SHIFT .macro ADD64 high,low,timer al \high,\timer - al \low,\timer+4 + al \low,4+\timer brc 12,.+8 ahi \high,1 .endm .macro SUB64 high,low,timer sl \high,\timer - sl \low,\timer+4 + sl \low,4+\timer brc 3,.+8 ahi \high,-1 .endm @@ -471,7 +471,6 @@ io_tif: jnz io_work # there is work to do (signals etc.) io_restore: mvc __LC_RETURN_PSW(8),__PT_PSW(%r11) - ni __LC_RETURN_PSW+1,0xfd # clean wait state bit stpt __LC_EXIT_TIMER lm %r0,%r15,__PT_R0(%r11) lpsw __LC_RETURN_PSW @@ -606,12 +605,32 @@ ext_skip: stm %r8,%r9,__PT_PSW(%r11) TRACE_IRQS_OFF lr %r2,%r11 # pass pointer to pt_regs - l %r3,__LC_CPU_ADDRESS # get cpu address + interruption code + l %r3,__LC_EXT_CPU_ADDR # get cpu address + interruption code l %r4,__LC_EXT_PARAMS # get external parameters l %r1,BASED(.Ldo_extint) basr %r14,%r1 # call do_extint j io_return +/* + * Load idle PSW. The second "half" of this function is in cleanup_idle. + */ +ENTRY(psw_idle) + st %r4,__SF_EMPTY(%r15) + basr %r1,0 + la %r1,psw_idle_lpsw+4-.(%r1) + st %r1,__SF_EMPTY+4(%r15) + oi __SF_EMPTY+4(%r15),0x80 + la %r1,.Lvtimer_max-psw_idle_lpsw-4(%r1) + stck __IDLE_ENTER(%r2) + ltr %r5,%r5 + stpt __VQ_IDLE_ENTER(%r3) + jz psw_idle_lpsw + spt 0(%r1) +psw_idle_lpsw: + lpsw __SF_EMPTY(%r15) + br %r14 +psw_idle_end: + __critical_end: /* @@ -673,7 +692,6 @@ mcck_skip: TRACE_IRQS_ON mcck_return: mvc __LC_RETURN_MCCK_PSW(8),__PT_PSW(%r11) # move return PSW - ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? jno 0f lm %r0,%r15,__PT_R0(%r11) @@ -691,77 +709,30 @@ mcck_panic: 0: ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) j mcck_skip -/* - * Restart interruption handler, kick starter for additional CPUs - */ -#ifdef CONFIG_SMP - __CPUINIT -ENTRY(restart_int_handler) - basr %r1,0 -restart_base: - spt restart_vtime-restart_base(%r1) - stck __LC_LAST_UPDATE_CLOCK - mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1) - mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1) - l %r15,__LC_GPREGS_SAVE_AREA+60 # load ksp - lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs - lam %a0,%a15,__LC_AREGS_SAVE_AREA - lm %r6,%r15,__SF_GPRS(%r15)# load registers from clone - l %r1,__LC_THREAD_INFO - mvc __LC_USER_TIMER(8),__TI_user_timer(%r1) - mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1) - xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER - ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off - basr %r14,0 - l %r14,restart_addr-.(%r14) - basr %r14,%r14 # call start_secondary -restart_addr: - .long start_secondary - .align 8 -restart_vtime: - .long 0x7fffffff,0xffffffff - .previous -#else -/* - * If we do not run with SMP enabled, let the new CPU crash ... - */ -ENTRY(restart_int_handler) - basr %r1,0 -restart_base: - lpsw restart_crash-restart_base(%r1) - .align 8 -restart_crash: - .long 0x000a0000,0x00000000 -restart_go: -#endif - # # PSW restart interrupt handler # -ENTRY(psw_restart_int_handler) +ENTRY(restart_int_handler) st %r15,__LC_SAVE_AREA_RESTART - basr %r15,0 -0: l %r15,.Lrestart_stack-0b(%r15) # load restart stack - l %r15,0(%r15) + l %r15,__LC_RESTART_STACK ahi %r15,-__PT_SIZE # create pt_regs on stack + xc 0(__PT_SIZE,%r15),0(%r15) stm %r0,%r14,__PT_R0(%r15) mvc __PT_R15(4,%r15),__LC_SAVE_AREA_RESTART mvc __PT_PSW(8,%r15),__LC_RST_OLD_PSW # store restart old psw - ahi %r15,-STACK_FRAME_OVERHEAD - xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) - basr %r14,0 -1: l %r14,.Ldo_restart-1b(%r14) - basr %r14,%r14 - basr %r14,0 # load disabled wait PSW if -2: lpsw restart_psw_crash-2b(%r14) # do_restart returns - .align 4 -.Ldo_restart: - .long do_restart -.Lrestart_stack: - .long restart_stack - .align 8 -restart_psw_crash: - .long 0x000a0000,0x00000000 + restart_psw_crash + ahi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack + xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) + lm %r1,%r3,__LC_RESTART_FN # load fn, parm & source cpu + ltr %r3,%r3 # test source cpu address + jm 1f # negative -> skip source stop +0: sigp %r4,%r3,1 # sigp sense to source cpu + brc 10,0b # wait for status stored +1: basr %r14,%r1 # call function + stap __SF_EMPTY(%r15) # store cpu address + lh %r3,__SF_EMPTY(%r15) +2: sigp %r4,%r3,5 # sigp stop to current cpu + brc 2,2b +3: j 3b .section .kprobes.text, "ax" @@ -795,6 +766,8 @@ cleanup_table: .long io_tif + 0x80000000 .long io_restore + 0x80000000 .long io_done + 0x80000000 + .long psw_idle + 0x80000000 + .long psw_idle_end + 0x80000000 cleanup_critical: cl %r9,BASED(cleanup_table) # system_call @@ -813,6 +786,10 @@ cleanup_critical: jl cleanup_io_tif cl %r9,BASED(cleanup_table+28) # io_done jl cleanup_io_restore + cl %r9,BASED(cleanup_table+32) # psw_idle + jl 0f + cl %r9,BASED(cleanup_table+36) # psw_idle_end + jl cleanup_idle 0: br %r14 cleanup_system_call: @@ -896,7 +873,6 @@ cleanup_io_restore: jhe 0f l %r9,12(%r11) # get saved r11 pointer to pt_regs mvc __LC_RETURN_PSW(8),__PT_PSW(%r9) - ni __LC_RETURN_PSW+1,0xfd # clear wait state bit mvc 0(32,%r11),__PT_R8(%r9) lm %r0,%r7,__PT_R0(%r9) 0: lm %r8,%r9,__LC_RETURN_PSW @@ -904,11 +880,52 @@ cleanup_io_restore: cleanup_io_restore_insn: .long io_done - 4 + 0x80000000 +cleanup_idle: + # copy interrupt clock & cpu timer + mvc __IDLE_EXIT(8,%r2),__LC_INT_CLOCK + mvc __VQ_IDLE_EXIT(8,%r3),__LC_ASYNC_ENTER_TIMER + chi %r11,__LC_SAVE_AREA_ASYNC + je 0f + mvc __IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK + mvc __VQ_IDLE_EXIT(8,%r3),__LC_MCCK_ENTER_TIMER +0: # check if stck has been executed + cl %r9,BASED(cleanup_idle_insn) + jhe 1f + mvc __IDLE_ENTER(8,%r2),__IDLE_EXIT(%r2) + mvc __VQ_IDLE_ENTER(8,%r3),__VQ_IDLE_EXIT(%r3) + j 2f +1: # check if the cpu timer has been reprogrammed + ltr %r5,%r5 + jz 2f + spt __VQ_IDLE_ENTER(%r3) +2: # account system time going idle + lm %r9,%r10,__LC_STEAL_TIMER + ADD64 %r9,%r10,__IDLE_ENTER(%r2) + SUB64 %r9,%r10,__LC_LAST_UPDATE_CLOCK + stm %r9,%r10,__LC_STEAL_TIMER + mvc __LC_LAST_UPDATE_CLOCK(8),__IDLE_EXIT(%r2) + lm %r9,%r10,__LC_SYSTEM_TIMER + ADD64 %r9,%r10,__LC_LAST_UPDATE_TIMER + SUB64 %r9,%r10,__VQ_IDLE_ENTER(%r3) + stm %r9,%r10,__LC_SYSTEM_TIMER + mvc __LC_LAST_UPDATE_TIMER(8),__VQ_IDLE_EXIT(%r3) + # prepare return psw + n %r8,BASED(cleanup_idle_wait) # clear wait state bit + l %r9,24(%r11) # return from psw_idle + br %r14 +cleanup_idle_insn: + .long psw_idle_lpsw + 0x80000000 +cleanup_idle_wait: + .long 0xfffdffff + /* * Integer constants */ .align 4 -.Lnr_syscalls: .long NR_syscalls +.Lnr_syscalls: + .long NR_syscalls +.Lvtimer_max: + .quad 0x7fffffffffffffff /* * Symbol constants |