/*
* 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 <linux/linkage.h>
#include <asm/cpu.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/setup.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; })
static inline void get_cpu_id(struct cpuid *ptr)
{
asm volatile("stidp %0" : "=Q" (*ptr));
}
extern void s390_adjust_jiffies(void);
extern int get_cpu_capability(unsigned int *);
/*
* User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
*/
#ifndef __s390x__
#define TASK_SIZE (1UL << 31)
#define TASK_UNMAPPED_BASE (1UL << 30)
#else /* __s390x__ */
#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)
#endif /* __s390x__ */
#ifdef __KERNEL__
#ifndef __s390x__
#define STACK_TOP (1UL << 31)
#define STACK_TOP_MAX (1UL << 31)
#else /* __s390x__ */
#define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
#define STACK_TOP_MAX (1UL << 42)
#endif /* __s390x__ */
#endif
#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 prot_addr; /* address of protection-excep. */
unsigned int trap_no;
struct per_regs per_user; /* User specified PER registers */
struct per_event per_event; /* Cause of the last PER trap */
/* 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
#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 { \
set_fs(USER_DS); \
regs->psw.mask = psw_user_bits; \
regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
regs->gprs[15] = new_stackp; \
} while (0)
#define start_thread31(regs, new_psw, new_stackp) do { \
set_fs(USER_DS); \
regs->psw.mask = psw_user32_bits; \
regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
regs->gprs[15] = new_stackp; \
crst_table_downgrade(current->mm, 1UL << 31); \
} while (0)
/* Forward declaration, a strange C thing */
struct task_struct;
struct mm_struct;
struct seq_file;
/* 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);
extern void show_code(struct pt_regs *regs);
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");
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 __s390x__
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 __s390x__
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 /* __s390x__ */
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 /* __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 ATTRIB_NORET 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__ */
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
#endif
/*
* Helper macro for exception table entries
*/
#ifndef __s390x__
#define EX_TABLE(_fault,_target) \
".section __ex_table,\"a\"\n" \
" .align 4\n" \
" .long " #_fault "," #_target "\n" \
".previous\n"
#else
#define EX_TABLE(_fault,_target) \
".section __ex_table,\"a\"\n" \
" .align 8\n" \
" .quad " #_fault "," #_target "\n" \
".previous\n"
#endif
#endif /* __ASM_S390_PROCESSOR_H */