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987bcdacb1
Drop support to compile the kernel with gcc versions older than 3.3.3. This allows us to use the "Q" inline assembly contraint on some more inline assemblies without duplicating a lot of complex code (e.g. __xchg and __cmpxchg). The distinction for older gcc versions can be removed which saves a few lines and simplifies the code. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
337 lines
8.5 KiB
C
337 lines
8.5 KiB
C
/*
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* include/asm-s390/processor.h
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*
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* S390 version
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* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Hartmut Penner (hp@de.ibm.com),
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*
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* Derived from "include/asm-i386/processor.h"
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* Copyright (C) 1994, Linus Torvalds
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*/
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#ifndef __ASM_S390_PROCESSOR_H
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#define __ASM_S390_PROCESSOR_H
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#include <linux/linkage.h>
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#include <asm/cpu.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include <asm/setup.h>
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#ifdef __KERNEL__
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/*
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* Default implementation of macro that returns current
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* instruction pointer ("program counter").
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*/
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#define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
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static inline void get_cpu_id(struct cpuid *ptr)
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{
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asm volatile("stidp %0" : "=Q" (*ptr));
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}
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extern void s390_adjust_jiffies(void);
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extern void print_cpu_info(void);
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extern int get_cpu_capability(unsigned int *);
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/*
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* User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
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*/
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#ifndef __s390x__
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#define TASK_SIZE (1UL << 31)
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#define TASK_UNMAPPED_BASE (1UL << 30)
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#else /* __s390x__ */
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#define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit)
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#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
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(1UL << 30) : (1UL << 41))
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#define TASK_SIZE TASK_SIZE_OF(current)
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#endif /* __s390x__ */
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#ifdef __KERNEL__
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#ifndef __s390x__
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#define STACK_TOP (1UL << 31)
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#define STACK_TOP_MAX (1UL << 31)
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#else /* __s390x__ */
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#define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
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#define STACK_TOP_MAX (1UL << 42)
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#endif /* __s390x__ */
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#endif
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#define HAVE_ARCH_PICK_MMAP_LAYOUT
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typedef struct {
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__u32 ar4;
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} mm_segment_t;
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/*
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* Thread structure
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*/
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struct thread_struct {
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s390_fp_regs fp_regs;
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unsigned int acrs[NUM_ACRS];
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unsigned long ksp; /* kernel stack pointer */
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mm_segment_t mm_segment;
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unsigned long prot_addr; /* address of protection-excep. */
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unsigned int trap_no;
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per_struct per_info;
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/* Used to give failing instruction back to user for ieee exceptions */
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unsigned long ieee_instruction_pointer;
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/* pfault_wait is used to block the process on a pfault event */
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unsigned long pfault_wait;
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};
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typedef struct thread_struct thread_struct;
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/*
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* Stack layout of a C stack frame.
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*/
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#ifndef __PACK_STACK
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struct stack_frame {
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unsigned long back_chain;
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unsigned long empty1[5];
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unsigned long gprs[10];
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unsigned int empty2[8];
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};
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#else
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struct stack_frame {
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unsigned long empty1[5];
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unsigned int empty2[8];
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unsigned long gprs[10];
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unsigned long back_chain;
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};
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#endif
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#define ARCH_MIN_TASKALIGN 8
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#define INIT_THREAD { \
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.ksp = sizeof(init_stack) + (unsigned long) &init_stack, \
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}
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/*
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* Do necessary setup to start up a new thread.
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*/
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#define start_thread(regs, new_psw, new_stackp) do { \
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set_fs(USER_DS); \
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regs->psw.mask = psw_user_bits; \
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regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
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regs->gprs[15] = new_stackp; \
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} while (0)
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#define start_thread31(regs, new_psw, new_stackp) do { \
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set_fs(USER_DS); \
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regs->psw.mask = psw_user32_bits; \
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regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
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regs->gprs[15] = new_stackp; \
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crst_table_downgrade(current->mm, 1UL << 31); \
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} while (0)
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/* Forward declaration, a strange C thing */
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struct task_struct;
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struct mm_struct;
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struct seq_file;
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/* Free all resources held by a thread. */
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extern void release_thread(struct task_struct *);
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extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
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/* Prepare to copy thread state - unlazy all lazy status */
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#define prepare_to_copy(tsk) do { } while (0)
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/*
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* Return saved PC of a blocked thread.
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*/
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extern unsigned long thread_saved_pc(struct task_struct *t);
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/*
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* Print register of task into buffer. Used in fs/proc/array.c.
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*/
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extern void task_show_regs(struct seq_file *m, struct task_struct *task);
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extern void show_code(struct pt_regs *regs);
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unsigned long get_wchan(struct task_struct *p);
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#define task_pt_regs(tsk) ((struct pt_regs *) \
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(task_stack_page(tsk) + THREAD_SIZE) - 1)
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#define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr)
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#define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15])
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/*
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* Give up the time slice of the virtual PU.
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*/
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static inline void cpu_relax(void)
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{
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if (MACHINE_HAS_DIAG44)
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asm volatile("diag 0,0,68");
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barrier();
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}
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static inline void psw_set_key(unsigned int key)
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{
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asm volatile("spka 0(%0)" : : "d" (key));
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}
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/*
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* Set PSW to specified value.
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*/
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static inline void __load_psw(psw_t psw)
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{
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#ifndef __s390x__
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asm volatile("lpsw %0" : : "Q" (psw) : "cc");
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#else
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asm volatile("lpswe %0" : : "Q" (psw) : "cc");
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#endif
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}
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/*
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* Set PSW mask to specified value, while leaving the
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* PSW addr pointing to the next instruction.
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*/
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static inline void __load_psw_mask (unsigned long mask)
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{
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unsigned long addr;
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psw_t psw;
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psw.mask = mask;
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#ifndef __s390x__
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asm volatile(
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" basr %0,0\n"
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"0: ahi %0,1f-0b\n"
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" st %0,%O1+4(%R1)\n"
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" lpsw %1\n"
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"1:"
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: "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
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#else /* __s390x__ */
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asm volatile(
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" larl %0,1f\n"
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" stg %0,%O1+8(%R1)\n"
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" lpswe %1\n"
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"1:"
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: "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
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#endif /* __s390x__ */
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}
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/*
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* Function to stop a processor until an interruption occurred
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*/
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static inline void enabled_wait(void)
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{
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__load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
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PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
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}
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/*
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* Function to drop a processor into disabled wait state
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*/
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static inline void ATTRIB_NORET disabled_wait(unsigned long code)
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{
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unsigned long ctl_buf;
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psw_t dw_psw;
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dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
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dw_psw.addr = code;
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/*
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* Store status and then load disabled wait psw,
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* the processor is dead afterwards
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*/
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#ifndef __s390x__
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asm volatile(
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" stctl 0,0,0(%2)\n"
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" ni 0(%2),0xef\n" /* switch off protection */
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" lctl 0,0,0(%2)\n"
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" stpt 0xd8\n" /* store timer */
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" stckc 0xe0\n" /* store clock comparator */
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" stpx 0x108\n" /* store prefix register */
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" stam 0,15,0x120\n" /* store access registers */
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" std 0,0x160\n" /* store f0 */
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" std 2,0x168\n" /* store f2 */
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" std 4,0x170\n" /* store f4 */
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" std 6,0x178\n" /* store f6 */
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" stm 0,15,0x180\n" /* store general registers */
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" stctl 0,15,0x1c0\n" /* store control registers */
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" oi 0x1c0,0x10\n" /* fake protection bit */
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" lpsw 0(%1)"
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: "=m" (ctl_buf)
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: "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
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#else /* __s390x__ */
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asm volatile(
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" stctg 0,0,0(%2)\n"
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" ni 4(%2),0xef\n" /* switch off protection */
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" lctlg 0,0,0(%2)\n"
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" lghi 1,0x1000\n"
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" stpt 0x328(1)\n" /* store timer */
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" stckc 0x330(1)\n" /* store clock comparator */
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" stpx 0x318(1)\n" /* store prefix register */
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" stam 0,15,0x340(1)\n"/* store access registers */
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" stfpc 0x31c(1)\n" /* store fpu control */
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" std 0,0x200(1)\n" /* store f0 */
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" std 1,0x208(1)\n" /* store f1 */
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" std 2,0x210(1)\n" /* store f2 */
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" std 3,0x218(1)\n" /* store f3 */
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" std 4,0x220(1)\n" /* store f4 */
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" std 5,0x228(1)\n" /* store f5 */
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" std 6,0x230(1)\n" /* store f6 */
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" std 7,0x238(1)\n" /* store f7 */
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" std 8,0x240(1)\n" /* store f8 */
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" std 9,0x248(1)\n" /* store f9 */
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" std 10,0x250(1)\n" /* store f10 */
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" std 11,0x258(1)\n" /* store f11 */
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" std 12,0x260(1)\n" /* store f12 */
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" std 13,0x268(1)\n" /* store f13 */
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" std 14,0x270(1)\n" /* store f14 */
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" std 15,0x278(1)\n" /* store f15 */
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" stmg 0,15,0x280(1)\n"/* store general registers */
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" stctg 0,15,0x380(1)\n"/* store control registers */
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" oi 0x384(1),0x10\n"/* fake protection bit */
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" lpswe 0(%1)"
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: "=m" (ctl_buf)
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: "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0", "1");
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#endif /* __s390x__ */
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while (1);
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}
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/*
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* Basic Machine Check/Program Check Handler.
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*/
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extern void s390_base_mcck_handler(void);
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extern void s390_base_pgm_handler(void);
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extern void s390_base_ext_handler(void);
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extern void (*s390_base_mcck_handler_fn)(void);
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extern void (*s390_base_pgm_handler_fn)(void);
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extern void (*s390_base_ext_handler_fn)(void);
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#define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
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#endif
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/*
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* Helper macro for exception table entries
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*/
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#ifndef __s390x__
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#define EX_TABLE(_fault,_target) \
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".section __ex_table,\"a\"\n" \
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" .align 4\n" \
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" .long " #_fault "," #_target "\n" \
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".previous\n"
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#else
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#define EX_TABLE(_fault,_target) \
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".section __ex_table,\"a\"\n" \
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" .align 8\n" \
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" .quad " #_fault "," #_target "\n" \
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".previous\n"
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#endif
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#endif /* __ASM_S390_PROCESSOR_H */
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