| /* |
| * S390 version |
| * Copyright IBM Corp. 1999 |
| * Author(s): Hartmut Penner (hp@de.ibm.com), |
| * Martin Schwidefsky (schwidefsky@de.ibm.com) |
| * |
| * Derived from "include/asm-i386/processor.h" |
| * Copyright (C) 1994, Linus Torvalds |
| */ |
| |
| #ifndef __ASM_S390_PROCESSOR_H |
| #define __ASM_S390_PROCESSOR_H |
| |
| #include <linux/const.h> |
| |
| #define CIF_MCCK_PENDING 0 /* machine check handling is pending */ |
| #define CIF_ASCE 1 /* user asce needs fixup / uaccess */ |
| #define CIF_NOHZ_DELAY 2 /* delay HZ disable for a tick */ |
| #define CIF_FPU 3 /* restore FPU registers */ |
| #define CIF_IGNORE_IRQ 4 /* ignore interrupt (for udelay) */ |
| #define CIF_ENABLED_WAIT 5 /* in enabled wait state */ |
| |
| #define _CIF_MCCK_PENDING _BITUL(CIF_MCCK_PENDING) |
| #define _CIF_ASCE _BITUL(CIF_ASCE) |
| #define _CIF_NOHZ_DELAY _BITUL(CIF_NOHZ_DELAY) |
| #define _CIF_FPU _BITUL(CIF_FPU) |
| #define _CIF_IGNORE_IRQ _BITUL(CIF_IGNORE_IRQ) |
| #define _CIF_ENABLED_WAIT _BITUL(CIF_ENABLED_WAIT) |
| |
| #ifndef __ASSEMBLY__ |
| |
| #include <linux/linkage.h> |
| #include <linux/irqflags.h> |
| #include <asm/cpu.h> |
| #include <asm/page.h> |
| #include <asm/ptrace.h> |
| #include <asm/setup.h> |
| #include <asm/runtime_instr.h> |
| #include <asm/fpu/types.h> |
| #include <asm/fpu/internal.h> |
| |
| static inline void set_cpu_flag(int flag) |
| { |
| S390_lowcore.cpu_flags |= (1UL << flag); |
| } |
| |
| static inline void clear_cpu_flag(int flag) |
| { |
| S390_lowcore.cpu_flags &= ~(1UL << flag); |
| } |
| |
| static inline int test_cpu_flag(int flag) |
| { |
| return !!(S390_lowcore.cpu_flags & (1UL << flag)); |
| } |
| |
| /* |
| * Test CIF flag of another CPU. The caller needs to ensure that |
| * CPU hotplug can not happen, e.g. by disabling preemption. |
| */ |
| static inline int test_cpu_flag_of(int flag, int cpu) |
| { |
| struct lowcore *lc = lowcore_ptr[cpu]; |
| return !!(lc->cpu_flags & (1UL << flag)); |
| } |
| |
| #define arch_needs_cpu() test_cpu_flag(CIF_NOHZ_DELAY) |
| |
| /* |
| * Default implementation of macro that returns current |
| * instruction pointer ("program counter"). |
| */ |
| #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; }) |
| |
| static inline void get_cpu_id(struct cpuid *ptr) |
| { |
| asm volatile("stidp %0" : "=Q" (*ptr)); |
| } |
| |
| extern void s390_adjust_jiffies(void); |
| extern const struct seq_operations cpuinfo_op; |
| extern int sysctl_ieee_emulation_warnings; |
| extern void execve_tail(void); |
| |
| /* |
| * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit. |
| */ |
| |
| #define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit) |
| #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \ |
| (1UL << 30) : (1UL << 41)) |
| #define TASK_SIZE TASK_SIZE_OF(current) |
| #define TASK_MAX_SIZE (1UL << 53) |
| |
| #define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42)) |
| #define STACK_TOP_MAX (1UL << 42) |
| |
| #define HAVE_ARCH_PICK_MMAP_LAYOUT |
| |
| typedef struct { |
| __u32 ar4; |
| } mm_segment_t; |
| |
| /* |
| * Thread structure |
| */ |
| struct thread_struct { |
| unsigned int acrs[NUM_ACRS]; |
| unsigned long ksp; /* kernel stack pointer */ |
| mm_segment_t mm_segment; |
| unsigned long gmap_addr; /* address of last gmap fault. */ |
| unsigned int gmap_pfault; /* signal of a pending guest pfault */ |
| struct per_regs per_user; /* User specified PER registers */ |
| struct per_event per_event; /* Cause of the last PER trap */ |
| unsigned long per_flags; /* Flags to control debug behavior */ |
| /* pfault_wait is used to block the process on a pfault event */ |
| unsigned long pfault_wait; |
| struct list_head list; |
| /* cpu runtime instrumentation */ |
| struct runtime_instr_cb *ri_cb; |
| unsigned char trap_tdb[256]; /* Transaction abort diagnose block */ |
| /* |
| * Warning: 'fpu' is dynamically-sized. It *MUST* be at |
| * the end. |
| */ |
| struct fpu fpu; /* FP and VX register save area */ |
| }; |
| |
| /* Flag to disable transactions. */ |
| #define PER_FLAG_NO_TE 1UL |
| /* Flag to enable random transaction aborts. */ |
| #define PER_FLAG_TE_ABORT_RAND 2UL |
| /* Flag to specify random transaction abort mode: |
| * - abort each transaction at a random instruction before TEND if set. |
| * - abort random transactions at a random instruction if cleared. |
| */ |
| #define PER_FLAG_TE_ABORT_RAND_TEND 4UL |
| |
| typedef struct thread_struct thread_struct; |
| |
| /* |
| * Stack layout of a C stack frame. |
| */ |
| #ifndef __PACK_STACK |
| struct stack_frame { |
| unsigned long back_chain; |
| unsigned long empty1[5]; |
| unsigned long gprs[10]; |
| unsigned int empty2[8]; |
| }; |
| #else |
| struct stack_frame { |
| unsigned long empty1[5]; |
| unsigned int empty2[8]; |
| unsigned long gprs[10]; |
| unsigned long back_chain; |
| }; |
| #endif |
| |
| #define ARCH_MIN_TASKALIGN 8 |
| |
| #define INIT_THREAD { \ |
| .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \ |
| .fpu.regs = (void *) init_task.thread.fpu.fprs, \ |
| } |
| |
| /* |
| * Do necessary setup to start up a new thread. |
| */ |
| #define start_thread(regs, new_psw, new_stackp) do { \ |
| regs->psw.mask = PSW_USER_BITS | PSW_MASK_EA | PSW_MASK_BA; \ |
| regs->psw.addr = new_psw; \ |
| regs->gprs[15] = new_stackp; \ |
| execve_tail(); \ |
| } while (0) |
| |
| #define start_thread31(regs, new_psw, new_stackp) do { \ |
| regs->psw.mask = PSW_USER_BITS | PSW_MASK_BA; \ |
| regs->psw.addr = new_psw; \ |
| regs->gprs[15] = new_stackp; \ |
| crst_table_downgrade(current->mm, 1UL << 31); \ |
| execve_tail(); \ |
| } while (0) |
| |
| /* Forward declaration, a strange C thing */ |
| struct task_struct; |
| struct mm_struct; |
| struct seq_file; |
| |
| typedef int (*dump_trace_func_t)(void *data, unsigned long address); |
| void dump_trace(dump_trace_func_t func, void *data, |
| struct task_struct *task, unsigned long sp); |
| |
| void show_cacheinfo(struct seq_file *m); |
| |
| /* Free all resources held by a thread. */ |
| extern void release_thread(struct task_struct *); |
| |
| /* |
| * Return saved PC of a blocked thread. |
| */ |
| extern unsigned long thread_saved_pc(struct task_struct *t); |
| |
| unsigned long get_wchan(struct task_struct *p); |
| #define task_pt_regs(tsk) ((struct pt_regs *) \ |
| (task_stack_page(tsk) + THREAD_SIZE) - 1) |
| #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr) |
| #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15]) |
| |
| /* Has task runtime instrumentation enabled ? */ |
| #define is_ri_task(tsk) (!!(tsk)->thread.ri_cb) |
| |
| static inline unsigned long current_stack_pointer(void) |
| { |
| unsigned long sp; |
| |
| asm volatile("la %0,0(15)" : "=a" (sp)); |
| return sp; |
| } |
| |
| static inline unsigned short stap(void) |
| { |
| unsigned short cpu_address; |
| |
| asm volatile("stap %0" : "=m" (cpu_address)); |
| return cpu_address; |
| } |
| |
| /* |
| * Give up the time slice of the virtual PU. |
| */ |
| void cpu_relax(void); |
| |
| #define cpu_relax_lowlatency() barrier() |
| |
| static inline void psw_set_key(unsigned int key) |
| { |
| asm volatile("spka 0(%0)" : : "d" (key)); |
| } |
| |
| /* |
| * Set PSW to specified value. |
| */ |
| static inline void __load_psw(psw_t psw) |
| { |
| asm volatile("lpswe %0" : : "Q" (psw) : "cc"); |
| } |
| |
| /* |
| * Set PSW mask to specified value, while leaving the |
| * PSW addr pointing to the next instruction. |
| */ |
| static inline void __load_psw_mask(unsigned long mask) |
| { |
| unsigned long addr; |
| psw_t psw; |
| |
| psw.mask = mask; |
| |
| asm volatile( |
| " larl %0,1f\n" |
| " stg %0,%O1+8(%R1)\n" |
| " lpswe %1\n" |
| "1:" |
| : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc"); |
| } |
| |
| /* |
| * Extract current PSW mask |
| */ |
| static inline unsigned long __extract_psw(void) |
| { |
| unsigned int reg1, reg2; |
| |
| asm volatile("epsw %0,%1" : "=d" (reg1), "=a" (reg2)); |
| return (((unsigned long) reg1) << 32) | ((unsigned long) reg2); |
| } |
| |
| static inline void local_mcck_enable(void) |
| { |
| __load_psw_mask(__extract_psw() | PSW_MASK_MCHECK); |
| } |
| |
| static inline void local_mcck_disable(void) |
| { |
| __load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK); |
| } |
| |
| /* |
| * Rewind PSW instruction address by specified number of bytes. |
| */ |
| static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc) |
| { |
| unsigned long mask; |
| |
| mask = (psw.mask & PSW_MASK_EA) ? -1UL : |
| (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 : |
| (1UL << 24) - 1; |
| return (psw.addr - ilc) & mask; |
| } |
| |
| /* |
| * Function to stop a processor until the next interrupt occurs |
| */ |
| void enabled_wait(void); |
| |
| /* |
| * Function to drop a processor into disabled wait state |
| */ |
| static inline void __noreturn disabled_wait(unsigned long code) |
| { |
| psw_t psw; |
| |
| psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA; |
| psw.addr = code; |
| __load_psw(psw); |
| while (1); |
| } |
| |
| /* |
| * Basic Machine Check/Program Check Handler. |
| */ |
| |
| extern void s390_base_mcck_handler(void); |
| extern void s390_base_pgm_handler(void); |
| extern void s390_base_ext_handler(void); |
| |
| extern void (*s390_base_mcck_handler_fn)(void); |
| extern void (*s390_base_pgm_handler_fn)(void); |
| extern void (*s390_base_ext_handler_fn)(void); |
| |
| #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL |
| |
| extern int memcpy_real(void *, void *, size_t); |
| extern void memcpy_absolute(void *, void *, size_t); |
| |
| #define mem_assign_absolute(dest, val) { \ |
| __typeof__(dest) __tmp = (val); \ |
| \ |
| BUILD_BUG_ON(sizeof(__tmp) != sizeof(val)); \ |
| memcpy_absolute(&(dest), &__tmp, sizeof(__tmp)); \ |
| } |
| |
| #endif /* __ASSEMBLY__ */ |
| |
| #endif /* __ASM_S390_PROCESSOR_H */ |