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/*
* 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>
/*
* 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;
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 (default).
*/
#define TASK_SIZE (0x80000000)
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
#define TASK_UNMAPPED_BASE (TASK_SIZE / 2)
#define THREAD_SIZE (2*PAGE_SIZE)
typedef struct {
unsigned long seg;
unsigned long acc4;
} mm_segment_t;
/* if you change the thread_struct structure, you must
* update the _TSS_* defines in entry.S
*/
struct thread_struct
{
s390_fp_regs fp_regs;
__u32 ar2; /* kernel access register 2 */
__u32 ar4; /* kernel access register 4 */
__u32 ksp; /* kernel stack pointer */
__u32 user_seg; /* HSTD */
__u32 error_code; /* error-code of last prog-excep. */
__u32 prot_addr; /* address of protection-excep. */
__u32 trap_no;
/* perform syscall argument validation (get/set_fs) */
mm_segment_t fs;
per_struct per_info;/* Must be aligned on an 4 byte boundary*/
/* Used to give failing instruction back to user for ieee exceptions */
addr_t ieee_instruction_pointer;
/* pfault_wait is used to block the process on a pfault event */
addr_t pfault_wait;
};
typedef struct thread_struct thread_struct;
#define INIT_THREAD {{0,{{0},{0},{0},{0},{0},{0},{0},{0},{0},{0}, \
{0},{0},{0},{0},{0},{0}}}, \
0, 0, \
sizeof(init_stack) + (__u32) &init_stack, \
(__pa((__u32) &swapper_pg_dir[0]) + _SEGMENT_TABLE),\
0,0,0, \
(mm_segment_t) { 0,1}, \
(per_struct) {{{{0,}}},0,0,0,0,{{0,}}}, \
0, 0 \
}
/* need to define ... */
#define start_thread(regs, new_psw, new_stackp) do { \
regs->psw.mask = _USER_PSW_MASK; \
regs->psw.addr = new_psw | 0x80000000; \
regs->gprs[15] = new_stackp ; \
} while (0)
/* Forward declaration, a strange C thing */
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);
/* Copy and release all segment info associated with a VM */
#define copy_segments(nr, mm) do { } while (0)
#define release_segments(mm) do { } while (0)
/*
* Return saved PC of a blocked thread. used in kernel/sched.
* resume in entry.S does not create a new stack frame, it
* just stores the registers %r6-%r15 to the frame given by
* schedule. We want to return the address of the caller of
* schedule, so we have to walk the backchain one time to
* find the frame schedule() store its return address.
*/
extern inline unsigned long thread_saved_pc(struct thread_struct *t)
{
unsigned long bc;
bc = *((unsigned long *) t->ksp);
return *((unsigned long *) (bc+56));
}
unsigned long get_wchan(struct task_struct *p);
#define __KSTK_PTREGS(tsk) \
((struct pt_regs *)((unsigned long) tsk+THREAD_SIZE) - 1)
#define KSTK_EIP(tsk) (__KSTK_PTREGS(tsk)->psw.addr)
#define KSTK_ESP(tsk) (__KSTK_PTREGS(tsk)->gprs[15])
/* Allocation and freeing of basic task resources. */
/*
* NOTE! The task struct and the stack go together
*/
#define alloc_task_struct() \
((struct task_struct *) __get_free_pages(GFP_KERNEL,1))
#define free_task_struct(p) free_pages((unsigned long)(p),1)
#define get_task_struct(tsk) atomic_inc(&virt_to_page(tsk)->count)
#define init_task (init_task_union.task)
#define init_stack (init_task_union.stack)
#define cpu_relax() do { } while (0)
/*
* Set of msr bits that gdb can change on behalf of a process.
*/
/* Only let our hackers near the condition codes */
#define PSW_MASK_DEBUGCHANGE 0x00003000UL
/* Don't let em near the addressing mode either */
#define PSW_ADDR_DEBUGCHANGE 0x7FFFFFFFUL
#define PSW_ADDR_MASK 0x7FFFFFFFUL
/* Program event recording mask */
#define PSW_PER_MASK 0x40000000UL
#define USER_STD_MASK 0x00000080UL
#define PSW_PROBLEM_STATE 0x00010000UL
/*
* Function to drop a processor into disabled wait state
*/
static inline void disabled_wait(unsigned long code)
{
char psw_buffer[2*sizeof(psw_t)];
char ctl_buf[4];
psw_t *dw_psw = (psw_t *)(((unsigned long) &psw_buffer+sizeof(psw_t)-1)
& -sizeof(psw_t));
dw_psw->mask = 0x000a0000;
dw_psw->addr = code;
/*
* Store status and then load disabled wait psw,
* the processor is dead afterwards
*/
asm volatile (" stctl 0,0,0(%1)\n"
" ni 0(%1),0xef\n" /* switch off protection */
" lctl 0,0,0(%1)\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 0(%1),0x10\n" /* fake protection bit */
" lpsw 0(%0)"
: : "a" (dw_psw), "a" (&ctl_buf) : "cc" );
}
#endif /* __ASM_S390_PROCESSOR_H */
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