/*
* 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 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])
/*
* 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" : : : "memory");
else
barrier();
}
/*
* Set PSW to specified value.
*/
static inline void __load_psw(psw_t psw)
{
#ifndef __s390x__
asm volatile ("lpsw 0(%0)" : : "a" (&psw), "m" (psw) : "cc" );
#else
asm volatile ("lpswe 0(%0)" : : "a" (&psw), "m" (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 __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)
{
__load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
}
/*
* Function to drop a processor into disabled wait state
*/
static inline void disabled_wait(unsigned long code)
{
unsigned long ctl_buf;
psw_t dw_psw;
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 */
