| /* |
| * include/asm-s390/system.h |
| * |
| * S390 version |
| * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation |
| * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), |
| * |
| * Derived from "include/asm-i386/system.h" |
| */ |
| |
| #ifndef __ASM_SYSTEM_H |
| #define __ASM_SYSTEM_H |
| |
| #include <linux/config.h> |
| #include <linux/kernel.h> |
| #include <asm/types.h> |
| #include <asm/ptrace.h> |
| #include <asm/setup.h> |
| #include <asm/processor.h> |
| |
| #ifdef __KERNEL__ |
| |
| struct task_struct; |
| |
| extern struct task_struct *__switch_to(void *, void *); |
| |
| #ifdef __s390x__ |
| #define __FLAG_SHIFT 56 |
| #else /* ! __s390x__ */ |
| #define __FLAG_SHIFT 24 |
| #endif /* ! __s390x__ */ |
| |
| static inline void save_fp_regs(s390_fp_regs *fpregs) |
| { |
| asm volatile ( |
| " std 0,8(%1)\n" |
| " std 2,24(%1)\n" |
| " std 4,40(%1)\n" |
| " std 6,56(%1)" |
| : "=m" (*fpregs) : "a" (fpregs), "m" (*fpregs) : "memory" ); |
| if (!MACHINE_HAS_IEEE) |
| return; |
| asm volatile( |
| " stfpc 0(%1)\n" |
| " std 1,16(%1)\n" |
| " std 3,32(%1)\n" |
| " std 5,48(%1)\n" |
| " std 7,64(%1)\n" |
| " std 8,72(%1)\n" |
| " std 9,80(%1)\n" |
| " std 10,88(%1)\n" |
| " std 11,96(%1)\n" |
| " std 12,104(%1)\n" |
| " std 13,112(%1)\n" |
| " std 14,120(%1)\n" |
| " std 15,128(%1)\n" |
| : "=m" (*fpregs) : "a" (fpregs), "m" (*fpregs) : "memory" ); |
| } |
| |
| static inline void restore_fp_regs(s390_fp_regs *fpregs) |
| { |
| asm volatile ( |
| " ld 0,8(%0)\n" |
| " ld 2,24(%0)\n" |
| " ld 4,40(%0)\n" |
| " ld 6,56(%0)" |
| : : "a" (fpregs), "m" (*fpregs) ); |
| if (!MACHINE_HAS_IEEE) |
| return; |
| asm volatile( |
| " lfpc 0(%0)\n" |
| " ld 1,16(%0)\n" |
| " ld 3,32(%0)\n" |
| " ld 5,48(%0)\n" |
| " ld 7,64(%0)\n" |
| " ld 8,72(%0)\n" |
| " ld 9,80(%0)\n" |
| " ld 10,88(%0)\n" |
| " ld 11,96(%0)\n" |
| " ld 12,104(%0)\n" |
| " ld 13,112(%0)\n" |
| " ld 14,120(%0)\n" |
| " ld 15,128(%0)\n" |
| : : "a" (fpregs), "m" (*fpregs) ); |
| } |
| |
| static inline void save_access_regs(unsigned int *acrs) |
| { |
| asm volatile ("stam 0,15,0(%0)" : : "a" (acrs) : "memory" ); |
| } |
| |
| static inline void restore_access_regs(unsigned int *acrs) |
| { |
| asm volatile ("lam 0,15,0(%0)" : : "a" (acrs) ); |
| } |
| |
| #define switch_to(prev,next,last) do { \ |
| if (prev == next) \ |
| break; \ |
| save_fp_regs(&prev->thread.fp_regs); \ |
| restore_fp_regs(&next->thread.fp_regs); \ |
| save_access_regs(&prev->thread.acrs[0]); \ |
| restore_access_regs(&next->thread.acrs[0]); \ |
| prev = __switch_to(prev,next); \ |
| } while (0) |
| |
| /* |
| * On SMP systems, when the scheduler does migration-cost autodetection, |
| * it needs a way to flush as much of the CPU's caches as possible. |
| * |
| * TODO: fill this in! |
| */ |
| static inline void sched_cacheflush(void) |
| { |
| } |
| |
| #ifdef CONFIG_VIRT_CPU_ACCOUNTING |
| extern void account_vtime(struct task_struct *); |
| extern void account_tick_vtime(struct task_struct *); |
| extern void account_system_vtime(struct task_struct *); |
| #else |
| #define account_vtime(x) do { /* empty */ } while (0) |
| #endif |
| |
| #define finish_arch_switch(prev) do { \ |
| set_fs(current->thread.mm_segment); \ |
| account_vtime(prev); \ |
| } while (0) |
| |
| #define nop() __asm__ __volatile__ ("nop") |
| |
| #define xchg(ptr,x) \ |
| ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(void *)(ptr),sizeof(*(ptr)))) |
| |
| static inline unsigned long __xchg(unsigned long x, void * ptr, int size) |
| { |
| unsigned long addr, old; |
| int shift; |
| |
| switch (size) { |
| case 1: |
| addr = (unsigned long) ptr; |
| shift = (3 ^ (addr & 3)) << 3; |
| addr ^= addr & 3; |
| asm volatile( |
| " l %0,0(%4)\n" |
| "0: lr 0,%0\n" |
| " nr 0,%3\n" |
| " or 0,%2\n" |
| " cs %0,0,0(%4)\n" |
| " jl 0b\n" |
| : "=&d" (old), "=m" (*(int *) addr) |
| : "d" (x << shift), "d" (~(255 << shift)), "a" (addr), |
| "m" (*(int *) addr) : "memory", "cc", "0" ); |
| x = old >> shift; |
| break; |
| case 2: |
| addr = (unsigned long) ptr; |
| shift = (2 ^ (addr & 2)) << 3; |
| addr ^= addr & 2; |
| asm volatile( |
| " l %0,0(%4)\n" |
| "0: lr 0,%0\n" |
| " nr 0,%3\n" |
| " or 0,%2\n" |
| " cs %0,0,0(%4)\n" |
| " jl 0b\n" |
| : "=&d" (old), "=m" (*(int *) addr) |
| : "d" (x << shift), "d" (~(65535 << shift)), "a" (addr), |
| "m" (*(int *) addr) : "memory", "cc", "0" ); |
| x = old >> shift; |
| break; |
| case 4: |
| asm volatile ( |
| " l %0,0(%3)\n" |
| "0: cs %0,%2,0(%3)\n" |
| " jl 0b\n" |
| : "=&d" (old), "=m" (*(int *) ptr) |
| : "d" (x), "a" (ptr), "m" (*(int *) ptr) |
| : "memory", "cc" ); |
| x = old; |
| break; |
| #ifdef __s390x__ |
| case 8: |
| asm volatile ( |
| " lg %0,0(%3)\n" |
| "0: csg %0,%2,0(%3)\n" |
| " jl 0b\n" |
| : "=&d" (old), "=m" (*(long *) ptr) |
| : "d" (x), "a" (ptr), "m" (*(long *) ptr) |
| : "memory", "cc" ); |
| x = old; |
| break; |
| #endif /* __s390x__ */ |
| } |
| return x; |
| } |
| |
| /* |
| * Atomic compare and exchange. Compare OLD with MEM, if identical, |
| * store NEW in MEM. Return the initial value in MEM. Success is |
| * indicated by comparing RETURN with OLD. |
| */ |
| |
| #define __HAVE_ARCH_CMPXCHG 1 |
| |
| #define cmpxchg(ptr,o,n)\ |
| ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\ |
| (unsigned long)(n),sizeof(*(ptr)))) |
| |
| static inline unsigned long |
| __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size) |
| { |
| unsigned long addr, prev, tmp; |
| int shift; |
| |
| switch (size) { |
| case 1: |
| addr = (unsigned long) ptr; |
| shift = (3 ^ (addr & 3)) << 3; |
| addr ^= addr & 3; |
| asm volatile( |
| " l %0,0(%4)\n" |
| "0: nr %0,%5\n" |
| " lr %1,%0\n" |
| " or %0,%2\n" |
| " or %1,%3\n" |
| " cs %0,%1,0(%4)\n" |
| " jnl 1f\n" |
| " xr %1,%0\n" |
| " nr %1,%5\n" |
| " jnz 0b\n" |
| "1:" |
| : "=&d" (prev), "=&d" (tmp) |
| : "d" (old << shift), "d" (new << shift), "a" (ptr), |
| "d" (~(255 << shift)) |
| : "memory", "cc" ); |
| return prev >> shift; |
| case 2: |
| addr = (unsigned long) ptr; |
| shift = (2 ^ (addr & 2)) << 3; |
| addr ^= addr & 2; |
| asm volatile( |
| " l %0,0(%4)\n" |
| "0: nr %0,%5\n" |
| " lr %1,%0\n" |
| " or %0,%2\n" |
| " or %1,%3\n" |
| " cs %0,%1,0(%4)\n" |
| " jnl 1f\n" |
| " xr %1,%0\n" |
| " nr %1,%5\n" |
| " jnz 0b\n" |
| "1:" |
| : "=&d" (prev), "=&d" (tmp) |
| : "d" (old << shift), "d" (new << shift), "a" (ptr), |
| "d" (~(65535 << shift)) |
| : "memory", "cc" ); |
| return prev >> shift; |
| case 4: |
| asm volatile ( |
| " cs %0,%2,0(%3)\n" |
| : "=&d" (prev) : "0" (old), "d" (new), "a" (ptr) |
| : "memory", "cc" ); |
| return prev; |
| #ifdef __s390x__ |
| case 8: |
| asm volatile ( |
| " csg %0,%2,0(%3)\n" |
| : "=&d" (prev) : "0" (old), "d" (new), "a" (ptr) |
| : "memory", "cc" ); |
| return prev; |
| #endif /* __s390x__ */ |
| } |
| return old; |
| } |
| |
| /* |
| * Force strict CPU ordering. |
| * And yes, this is required on UP too when we're talking |
| * to devices. |
| * |
| * This is very similar to the ppc eieio/sync instruction in that is |
| * does a checkpoint syncronisation & makes sure that |
| * all memory ops have completed wrt other CPU's ( see 7-15 POP DJB ). |
| */ |
| |
| #define eieio() __asm__ __volatile__ ( "bcr 15,0" : : : "memory" ) |
| # define SYNC_OTHER_CORES(x) eieio() |
| #define mb() eieio() |
| #define rmb() eieio() |
| #define wmb() eieio() |
| #define read_barrier_depends() do { } while(0) |
| #define smp_mb() mb() |
| #define smp_rmb() rmb() |
| #define smp_wmb() wmb() |
| #define smp_read_barrier_depends() read_barrier_depends() |
| #define smp_mb__before_clear_bit() smp_mb() |
| #define smp_mb__after_clear_bit() smp_mb() |
| |
| |
| #define set_mb(var, value) do { var = value; mb(); } while (0) |
| #define set_wmb(var, value) do { var = value; wmb(); } while (0) |
| |
| /* interrupt control.. */ |
| #define local_irq_enable() ({ \ |
| unsigned long __dummy; \ |
| __asm__ __volatile__ ( \ |
| "stosm 0(%1),0x03" \ |
| : "=m" (__dummy) : "a" (&__dummy) : "memory" ); \ |
| }) |
| |
| #define local_irq_disable() ({ \ |
| unsigned long __flags; \ |
| __asm__ __volatile__ ( \ |
| "stnsm 0(%1),0xfc" : "=m" (__flags) : "a" (&__flags) ); \ |
| __flags; \ |
| }) |
| |
| #define local_save_flags(x) \ |
| __asm__ __volatile__("stosm 0(%1),0" : "=m" (x) : "a" (&x), "m" (x) ) |
| |
| #define local_irq_restore(x) \ |
| __asm__ __volatile__("ssm 0(%0)" : : "a" (&x), "m" (x) : "memory") |
| |
| #define irqs_disabled() \ |
| ({ \ |
| unsigned long flags; \ |
| local_save_flags(flags); \ |
| !((flags >> __FLAG_SHIFT) & 3); \ |
| }) |
| |
| #ifdef __s390x__ |
| |
| #define __ctl_load(array, low, high) ({ \ |
| typedef struct { char _[sizeof(array)]; } addrtype; \ |
| __asm__ __volatile__ ( \ |
| " bras 1,0f\n" \ |
| " lctlg 0,0,0(%0)\n" \ |
| "0: ex %1,0(1)" \ |
| : : "a" (&array), "a" (((low)<<4)+(high)), \ |
| "m" (*(addrtype *)(array)) : "1" ); \ |
| }) |
| |
| #define __ctl_store(array, low, high) ({ \ |
| typedef struct { char _[sizeof(array)]; } addrtype; \ |
| __asm__ __volatile__ ( \ |
| " bras 1,0f\n" \ |
| " stctg 0,0,0(%1)\n" \ |
| "0: ex %2,0(1)" \ |
| : "=m" (*(addrtype *)(array)) \ |
| : "a" (&array), "a" (((low)<<4)+(high)) : "1" ); \ |
| }) |
| |
| #define __ctl_set_bit(cr, bit) ({ \ |
| __u8 __dummy[24]; \ |
| __asm__ __volatile__ ( \ |
| " bras 1,0f\n" /* skip indirect insns */ \ |
| " stctg 0,0,0(%1)\n" \ |
| " lctlg 0,0,0(%1)\n" \ |
| "0: ex %2,0(1)\n" /* execute stctl */ \ |
| " lg 0,0(%1)\n" \ |
| " ogr 0,%3\n" /* set the bit */ \ |
| " stg 0,0(%1)\n" \ |
| "1: ex %2,6(1)" /* execute lctl */ \ |
| : "=m" (__dummy) \ |
| : "a" ((((unsigned long) &__dummy) + 7) & ~7UL), \ |
| "a" (cr*17), "a" (1L<<(bit)) \ |
| : "cc", "0", "1" ); \ |
| }) |
| |
| #define __ctl_clear_bit(cr, bit) ({ \ |
| __u8 __dummy[16]; \ |
| __asm__ __volatile__ ( \ |
| " bras 1,0f\n" /* skip indirect insns */ \ |
| " stctg 0,0,0(%1)\n" \ |
| " lctlg 0,0,0(%1)\n" \ |
| "0: ex %2,0(1)\n" /* execute stctl */ \ |
| " lg 0,0(%1)\n" \ |
| " ngr 0,%3\n" /* set the bit */ \ |
| " stg 0,0(%1)\n" \ |
| "1: ex %2,6(1)" /* execute lctl */ \ |
| : "=m" (__dummy) \ |
| : "a" ((((unsigned long) &__dummy) + 7) & ~7UL), \ |
| "a" (cr*17), "a" (~(1L<<(bit))) \ |
| : "cc", "0", "1" ); \ |
| }) |
| |
| #else /* __s390x__ */ |
| |
| #define __ctl_load(array, low, high) ({ \ |
| typedef struct { char _[sizeof(array)]; } addrtype; \ |
| __asm__ __volatile__ ( \ |
| " bras 1,0f\n" \ |
| " lctl 0,0,0(%0)\n" \ |
| "0: ex %1,0(1)" \ |
| : : "a" (&array), "a" (((low)<<4)+(high)), \ |
| "m" (*(addrtype *)(array)) : "1" ); \ |
| }) |
| |
| #define __ctl_store(array, low, high) ({ \ |
| typedef struct { char _[sizeof(array)]; } addrtype; \ |
| __asm__ __volatile__ ( \ |
| " bras 1,0f\n" \ |
| " stctl 0,0,0(%1)\n" \ |
| "0: ex %2,0(1)" \ |
| : "=m" (*(addrtype *)(array)) \ |
| : "a" (&array), "a" (((low)<<4)+(high)): "1" ); \ |
| }) |
| |
| #define __ctl_set_bit(cr, bit) ({ \ |
| __u8 __dummy[16]; \ |
| __asm__ __volatile__ ( \ |
| " bras 1,0f\n" /* skip indirect insns */ \ |
| " stctl 0,0,0(%1)\n" \ |
| " lctl 0,0,0(%1)\n" \ |
| "0: ex %2,0(1)\n" /* execute stctl */ \ |
| " l 0,0(%1)\n" \ |
| " or 0,%3\n" /* set the bit */ \ |
| " st 0,0(%1)\n" \ |
| "1: ex %2,4(1)" /* execute lctl */ \ |
| : "=m" (__dummy) \ |
| : "a" ((((unsigned long) &__dummy) + 7) & ~7UL), \ |
| "a" (cr*17), "a" (1<<(bit)) \ |
| : "cc", "0", "1" ); \ |
| }) |
| |
| #define __ctl_clear_bit(cr, bit) ({ \ |
| __u8 __dummy[16]; \ |
| __asm__ __volatile__ ( \ |
| " bras 1,0f\n" /* skip indirect insns */ \ |
| " stctl 0,0,0(%1)\n" \ |
| " lctl 0,0,0(%1)\n" \ |
| "0: ex %2,0(1)\n" /* execute stctl */ \ |
| " l 0,0(%1)\n" \ |
| " nr 0,%3\n" /* set the bit */ \ |
| " st 0,0(%1)\n" \ |
| "1: ex %2,4(1)" /* execute lctl */ \ |
| : "=m" (__dummy) \ |
| : "a" ((((unsigned long) &__dummy) + 7) & ~7UL), \ |
| "a" (cr*17), "a" (~(1<<(bit))) \ |
| : "cc", "0", "1" ); \ |
| }) |
| #endif /* __s390x__ */ |
| |
| /* For spinlocks etc */ |
| #define local_irq_save(x) ((x) = local_irq_disable()) |
| |
| /* |
| * Use to set psw mask except for the first byte which |
| * won't be changed by this function. |
| */ |
| static inline void |
| __set_psw_mask(unsigned long mask) |
| { |
| local_save_flags(mask); |
| __load_psw_mask(mask); |
| } |
| |
| #define local_mcck_enable() __set_psw_mask(PSW_KERNEL_BITS) |
| #define local_mcck_disable() __set_psw_mask(PSW_KERNEL_BITS & ~PSW_MASK_MCHECK) |
| |
| #ifdef CONFIG_SMP |
| |
| extern void smp_ctl_set_bit(int cr, int bit); |
| extern void smp_ctl_clear_bit(int cr, int bit); |
| #define ctl_set_bit(cr, bit) smp_ctl_set_bit(cr, bit) |
| #define ctl_clear_bit(cr, bit) smp_ctl_clear_bit(cr, bit) |
| |
| #else |
| |
| #define ctl_set_bit(cr, bit) __ctl_set_bit(cr, bit) |
| #define ctl_clear_bit(cr, bit) __ctl_clear_bit(cr, bit) |
| |
| #endif /* CONFIG_SMP */ |
| |
| extern void (*_machine_restart)(char *command); |
| extern void (*_machine_halt)(void); |
| extern void (*_machine_power_off)(void); |
| |
| #define arch_align_stack(x) (x) |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif |
| |
