| /* |
| * include/asm-s390/processor.h |
| * |
| * S390 version |
| * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation |
| * 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 <asm/page.h> |
| #include <asm/ptrace.h> |
| |
| #ifdef __KERNEL__ |
| /* |
| * Default implementation of macro that returns current |
| * instruction pointer ("program counter"). |
| */ |
| #define current_text_addr() ({ void *pc; __asm__("basr %0,0":"=a"(pc)); pc; }) |
| |
| /* |
| * CPU type and hardware bug flags. Kept separately for each CPU. |
| * Members of this structure are referenced in head.S, so think twice |
| * before touching them. [mj] |
| */ |
| |
| typedef struct |
| { |
| unsigned int version : 8; |
| unsigned int ident : 24; |
| unsigned int machine : 16; |
| unsigned int unused : 16; |
| } __attribute__ ((packed)) cpuid_t; |
| |
| struct cpuinfo_S390 |
| { |
| cpuid_t cpu_id; |
| __u16 cpu_addr; |
| __u16 cpu_nr; |
| unsigned long loops_per_jiffy; |
| unsigned long *pgd_quick; |
| #ifdef __s390x__ |
| unsigned long *pmd_quick; |
| #endif /* __s390x__ */ |
| unsigned long *pte_quick; |
| unsigned long pgtable_cache_sz; |
| }; |
| |
| extern void print_cpu_info(struct cpuinfo_S390 *); |
| |
| /* Lazy FPU handling on uni-processor */ |
| extern struct task_struct *last_task_used_math; |
| |
| /* |
| * User space process size: 2GB for 31 bit, 4TB for 64 bit. |
| */ |
| #ifndef __s390x__ |
| |
| # define TASK_SIZE (0x80000000UL) |
| # define TASK_UNMAPPED_BASE (TASK_SIZE / 2) |
| # define DEFAULT_TASK_SIZE (0x80000000UL) |
| |
| #else /* __s390x__ */ |
| |
| # define TASK_SIZE (test_thread_flag(TIF_31BIT) ? \ |
| (0x80000000UL) : (0x40000000000UL)) |
| # define TASK_UNMAPPED_BASE (TASK_SIZE / 2) |
| # define DEFAULT_TASK_SIZE (0x40000000000UL) |
| |
| #endif /* __s390x__ */ |
| |
| #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 */ |
| unsigned long user_seg; /* HSTD */ |
| mm_segment_t mm_segment; |
| unsigned long prot_addr; /* address of protection-excep. */ |
| unsigned int error_code; /* error-code of last prog-excep. */ |
| unsigned int trap_no; |
| per_struct per_info; |
| /* Used to give failing instruction back to user for ieee exceptions */ |
| unsigned long ieee_instruction_pointer; |
| /* pfault_wait is used to block the process on a pfault event */ |
| unsigned long pfault_wait; |
| }; |
| |
| 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 |
| |
| #ifndef __s390x__ |
| # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _SEGMENT_TABLE |
| #else /* __s390x__ */ |
| # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _REGION_TABLE |
| #endif /* __s390x__ */ |
| |
| #define INIT_THREAD {{0,{{0},{0},{0},{0},{0},{0},{0},{0},{0},{0}, \ |
| {0},{0},{0},{0},{0},{0}}}, \ |
| {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, \ |
| sizeof(init_stack) + (unsigned long) &init_stack, \ |
| __SWAPPER_PG_DIR, \ |
| {0}, \ |
| 0,0,0, \ |
| (per_struct) {{{{0,}}},0,0,0,0,{{0,}}}, \ |
| 0, 0 \ |
| } |
| |
| /* |
| * Do necessary setup to start up a new thread. |
| */ |
| #ifndef __s390x__ |
| |
| #define start_thread(regs, new_psw, new_stackp) do { \ |
| regs->psw.mask = PSW_USER_BITS; \ |
| regs->psw.addr = new_psw | PSW_ADDR_AMODE; \ |
| regs->gprs[15] = new_stackp ; \ |
| } while (0) |
| |
| #else /* __s390x__ */ |
| |
| #define start_thread(regs, new_psw, new_stackp) do { \ |
| regs->psw.mask = PSW_USER_BITS; \ |
| regs->psw.addr = new_psw; \ |
| regs->gprs[15] = new_stackp; \ |
| } while (0) |
| |
| #define start_thread31(regs, new_psw, new_stackp) do { \ |
| regs->psw.mask = PSW_USER32_BITS; \ |
| regs->psw.addr = new_psw; \ |
| regs->gprs[15] = new_stackp; \ |
| } while (0) |
| |
| #endif /* __s390x__ */ |
| |
| /* Forward declaration, a strange C thing */ |
| struct task_struct; |
| struct mm_struct; |
| |
| /* Free all resources held by a thread. */ |
| extern void release_thread(struct task_struct *); |
| extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); |
| |
| /* Prepare to copy thread state - unlazy all lazy status */ |
| #define prepare_to_copy(tsk) do { } while (0) |
| |
| /* |
| * Return saved PC of a blocked thread. |
| */ |
| extern unsigned long thread_saved_pc(struct task_struct *t); |
| |
| /* |
| * Print register of task into buffer. Used in fs/proc/array.c. |
| */ |
| extern char *task_show_regs(struct task_struct *task, char *buffer); |
| |
| extern void show_registers(struct pt_regs *regs); |
| extern void show_trace(struct task_struct *task, unsigned long *sp); |
| |
| unsigned long get_wchan(struct task_struct *p); |
| #define __KSTK_PTREGS(tsk) ((struct pt_regs *) \ |
| ((unsigned long) tsk->thread_info + THREAD_SIZE - sizeof(struct pt_regs))) |
| #define KSTK_EIP(tsk) (__KSTK_PTREGS(tsk)->psw.addr) |
| #define KSTK_ESP(tsk) (__KSTK_PTREGS(tsk)->gprs[15]) |
| |
| /* |
| * Give up the time slice of the virtual PU. |
| */ |
| #ifndef __s390x__ |
| # define cpu_relax() asm volatile ("diag 0,0,68" : : : "memory") |
| #else /* __s390x__ */ |
| # define cpu_relax() \ |
| asm volatile ("ex 0,%0" : : "i" (__LC_DIAG44_OPCODE) : "memory") |
| #endif /* __s390x__ */ |
| |
| /* |
| * 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 __s390x__ |
| asm volatile ( |
| " basr %0,0\n" |
| "0: ahi %0,1f-0b\n" |
| " st %0,4(%1)\n" |
| " lpsw 0(%1)\n" |
| "1:" |
| : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc" ); |
| #else /* __s390x__ */ |
| asm volatile ( |
| " larl %0,1f\n" |
| " stg %0,8(%1)\n" |
| " lpswe 0(%1)\n" |
| "1:" |
| : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc" ); |
| #endif /* __s390x__ */ |
| } |
| |
| /* |
| * Function to stop a processor until an interruption occurred |
| */ |
| static inline void enabled_wait(void) |
| { |
| unsigned long reg; |
| psw_t wait_psw; |
| |
| wait_psw.mask = PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT | |
| PSW_MASK_MCHECK | PSW_MASK_WAIT; |
| #ifndef __s390x__ |
| asm volatile ( |
| " basr %0,0\n" |
| "0: la %0,1f-0b(%0)\n" |
| " st %0,4(%1)\n" |
| " oi 4(%1),0x80\n" |
| " lpsw 0(%1)\n" |
| "1:" |
| : "=&a" (reg) : "a" (&wait_psw), "m" (wait_psw) |
| : "memory", "cc" ); |
| #else /* __s390x__ */ |
| asm volatile ( |
| " larl %0,0f\n" |
| " stg %0,8(%1)\n" |
| " lpswe 0(%1)\n" |
| "0:" |
| : "=&a" (reg) : "a" (&wait_psw), "m" (wait_psw) |
| : "memory", "cc" ); |
| #endif /* __s390x__ */ |
| } |
| |
| /* |
| * Function to drop a processor into disabled wait state |
| */ |
| |
| static inline void disabled_wait(unsigned long code) |
| { |
| char psw_buffer[2*sizeof(psw_t)]; |
| unsigned long ctl_buf; |
| psw_t *dw_psw = (psw_t *)(((unsigned long) &psw_buffer+sizeof(psw_t)-1) |
| & -sizeof(psw_t)); |
| |
| dw_psw->mask = PSW_BASE_BITS | PSW_MASK_WAIT; |
| dw_psw->addr = code; |
| /* |
| * Store status and then load disabled wait psw, |
| * the processor is dead afterwards |
| */ |
| #ifndef __s390x__ |
| 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 /* __s390x__ */ |
| 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 /* __s390x__ */ |
| } |
| |
| /* |
| * CPU idle notifier chain. |
| */ |
| #define CPU_IDLE 0 |
| #define CPU_NOT_IDLE 1 |
| |
| struct notifier_block; |
| int register_idle_notifier(struct notifier_block *nb); |
| int unregister_idle_notifier(struct notifier_block *nb); |
| |
| #endif |
| |
| #endif /* __ASM_S390_PROCESSOR_H */ |