| /* |
| * 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 |
| |
| #define CIF_MCCK_PENDING 0 /* machine check handling is pending */ |
| #define CIF_ASCE 1 /* user asce needs fixup / uaccess */ |
| |
| #define _CIF_MCCK_PENDING (1<<CIF_MCCK_PENDING) |
| #define _CIF_ASCE (1<<CIF_ASCE) |
| |
| |
| #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> |
| |
| static inline void set_cpu_flag(int flag) |
| { |
| S390_lowcore.cpu_flags |= (1U << flag); |
| } |
| |
| static inline void clear_cpu_flag(int flag) |
| { |
| S390_lowcore.cpu_flags &= ~(1U << flag); |
| } |
| |
| static inline int test_cpu_flag(int flag) |
| { |
| return !!(S390_lowcore.cpu_flags & (1U << flag)); |
| } |
| |
| /* |
| * 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. |
| */ |
| #ifndef CONFIG_64BIT |
| |
| #define TASK_SIZE (1UL << 31) |
| #define TASK_MAX_SIZE (1UL << 31) |
| #define TASK_UNMAPPED_BASE (1UL << 30) |
| |
| #else /* CONFIG_64BIT */ |
| |
| #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) |
| |
| #endif /* CONFIG_64BIT */ |
| |
| #ifndef CONFIG_64BIT |
| #define STACK_TOP (1UL << 31) |
| #define STACK_TOP_MAX (1UL << 31) |
| #else /* CONFIG_64BIT */ |
| #define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42)) |
| #define STACK_TOP_MAX (1UL << 42) |
| #endif /* CONFIG_64BIT */ |
| |
| #define HAVE_ARCH_PICK_MMAP_LAYOUT |
| |
| typedef struct { |
| __u32 ar4; |
| } mm_segment_t; |
| |
| /* |
| * Thread structure |
| */ |
| struct thread_struct { |
| s390_fp_regs fp_regs; |
| 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; |
| int ri_signum; |
| #ifdef CONFIG_64BIT |
| unsigned char trap_tdb[256]; /* Transaction abort diagnose block */ |
| #endif |
| }; |
| |
| /* 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, \ |
| } |
| |
| /* |
| * 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 | PSW_ADDR_AMODE; \ |
| 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 | PSW_ADDR_AMODE; \ |
| 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; |
| |
| #ifdef CONFIG_64BIT |
| extern void show_cacheinfo(struct seq_file *m); |
| #else |
| static inline void show_cacheinfo(struct seq_file *m) { } |
| #endif |
| |
| /* 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 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. |
| */ |
| static inline void cpu_relax(void) |
| { |
| if (MACHINE_HAS_DIAG44) |
| asm volatile("diag 0,0,68"); |
| barrier(); |
| } |
| |
| #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) |
| { |
| #ifndef CONFIG_64BIT |
| asm volatile("lpsw %0" : : "Q" (psw) : "cc"); |
| #else |
| asm volatile("lpswe %0" : : "Q" (psw) : "cc"); |
| #endif |
| } |
| |
| /* |
| * 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; |
| |
| #ifndef CONFIG_64BIT |
| asm volatile( |
| " basr %0,0\n" |
| "0: ahi %0,1f-0b\n" |
| " st %0,%O1+4(%R1)\n" |
| " lpsw %1\n" |
| "1:" |
| : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc"); |
| #else /* CONFIG_64BIT */ |
| asm volatile( |
| " larl %0,1f\n" |
| " stg %0,%O1+8(%R1)\n" |
| " lpswe %1\n" |
| "1:" |
| : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc"); |
| #endif /* CONFIG_64BIT */ |
| } |
| |
| /* |
| * Rewind PSW instruction address by specified number of bytes. |
| */ |
| static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc) |
| { |
| #ifndef CONFIG_64BIT |
| if (psw.addr & PSW_ADDR_AMODE) |
| /* 31 bit mode */ |
| return (psw.addr - ilc) | PSW_ADDR_AMODE; |
| /* 24 bit mode */ |
| return (psw.addr - ilc) & ((1UL << 24) - 1); |
| #else |
| 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; |
| #endif |
| } |
| |
| /* |
| * Function to drop a processor into disabled wait state |
| */ |
| static inline void __noreturn disabled_wait(unsigned long code) |
| { |
| unsigned long ctl_buf; |
| psw_t dw_psw; |
| |
| dw_psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA; |
| dw_psw.addr = code; |
| /* |
| * Store status and then load disabled wait psw, |
| * the processor is dead afterwards |
| */ |
| #ifndef CONFIG_64BIT |
| asm volatile( |
| " stctl 0,0,0(%2)\n" |
| " ni 0(%2),0xef\n" /* switch off protection */ |
| " lctl 0,0,0(%2)\n" |
| " stpt 0xd8\n" /* store timer */ |
| " stckc 0xe0\n" /* store clock comparator */ |
| " stpx 0x108\n" /* store prefix register */ |
| " stam 0,15,0x120\n" /* store access registers */ |
| " std 0,0x160\n" /* store f0 */ |
| " std 2,0x168\n" /* store f2 */ |
| " std 4,0x170\n" /* store f4 */ |
| " std 6,0x178\n" /* store f6 */ |
| " stm 0,15,0x180\n" /* store general registers */ |
| " stctl 0,15,0x1c0\n" /* store control registers */ |
| " oi 0x1c0,0x10\n" /* fake protection bit */ |
| " lpsw 0(%1)" |
| : "=m" (ctl_buf) |
| : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc"); |
| #else /* CONFIG_64BIT */ |
| asm volatile( |
| " stctg 0,0,0(%2)\n" |
| " ni 4(%2),0xef\n" /* switch off protection */ |
| " lctlg 0,0,0(%2)\n" |
| " lghi 1,0x1000\n" |
| " stpt 0x328(1)\n" /* store timer */ |
| " stckc 0x330(1)\n" /* store clock comparator */ |
| " stpx 0x318(1)\n" /* store prefix register */ |
| " stam 0,15,0x340(1)\n"/* store access registers */ |
| " stfpc 0x31c(1)\n" /* store fpu control */ |
| " std 0,0x200(1)\n" /* store f0 */ |
| " std 1,0x208(1)\n" /* store f1 */ |
| " std 2,0x210(1)\n" /* store f2 */ |
| " std 3,0x218(1)\n" /* store f3 */ |
| " std 4,0x220(1)\n" /* store f4 */ |
| " std 5,0x228(1)\n" /* store f5 */ |
| " std 6,0x230(1)\n" /* store f6 */ |
| " std 7,0x238(1)\n" /* store f7 */ |
| " std 8,0x240(1)\n" /* store f8 */ |
| " std 9,0x248(1)\n" /* store f9 */ |
| " std 10,0x250(1)\n" /* store f10 */ |
| " std 11,0x258(1)\n" /* store f11 */ |
| " std 12,0x260(1)\n" /* store f12 */ |
| " std 13,0x268(1)\n" /* store f13 */ |
| " std 14,0x270(1)\n" /* store f14 */ |
| " std 15,0x278(1)\n" /* store f15 */ |
| " stmg 0,15,0x280(1)\n"/* store general registers */ |
| " stctg 0,15,0x380(1)\n"/* store control registers */ |
| " oi 0x384(1),0x10\n"/* fake protection bit */ |
| " lpswe 0(%1)" |
| : "=m" (ctl_buf) |
| : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0", "1"); |
| #endif /* CONFIG_64BIT */ |
| while (1); |
| } |
| |
| /* |
| * 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) |
| { |
| __load_psw_mask(mask | (arch_local_save_flags() & ~(-1UL >> 8))); |
| } |
| |
| #define local_mcck_enable() \ |
| __set_psw_mask(PSW_KERNEL_BITS | PSW_MASK_DAT | PSW_MASK_MCHECK) |
| #define local_mcck_disable() \ |
| __set_psw_mask(PSW_KERNEL_BITS | PSW_MASK_DAT) |
| |
| /* |
| * 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)); \ |
| } |
| |
| /* |
| * Helper macro for exception table entries |
| */ |
| #define EX_TABLE(_fault, _target) \ |
| ".section __ex_table,\"a\"\n" \ |
| ".align 4\n" \ |
| ".long (" #_fault ") - .\n" \ |
| ".long (" #_target ") - .\n" \ |
| ".previous\n" |
| |
| #else /* __ASSEMBLY__ */ |
| |
| #define EX_TABLE(_fault, _target) \ |
| .section __ex_table,"a" ; \ |
| .align 4 ; \ |
| .long (_fault) - . ; \ |
| .long (_target) - . ; \ |
| .previous |
| |
| #endif /* __ASSEMBLY__ */ |
| |
| #endif /* __ASM_S390_PROCESSOR_H */ |