287 lines
6.5 KiB
C
287 lines
6.5 KiB
C
#ifndef __ASM_SH64_PROCESSOR_H
|
|
#define __ASM_SH64_PROCESSOR_H
|
|
|
|
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* include/asm-sh64/processor.h
|
|
*
|
|
* Copyright (C) 2000, 2001 Paolo Alberelli
|
|
* Copyright (C) 2003 Paul Mundt
|
|
* Copyright (C) 2004 Richard Curnow
|
|
*
|
|
*/
|
|
|
|
#include <asm/page.h>
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <asm/types.h>
|
|
#include <asm/cache.h>
|
|
#include <asm/registers.h>
|
|
#include <linux/threads.h>
|
|
|
|
/*
|
|
* Default implementation of macro that returns current
|
|
* instruction pointer ("program counter").
|
|
*/
|
|
#define current_text_addr() ({ \
|
|
void *pc; \
|
|
unsigned long long __dummy = 0; \
|
|
__asm__("gettr tr0, %1\n\t" \
|
|
"pta 4, tr0\n\t" \
|
|
"gettr tr0, %0\n\t" \
|
|
"ptabs %1, tr0\n\t" \
|
|
:"=r" (pc), "=r" (__dummy) \
|
|
: "1" (__dummy)); \
|
|
pc; })
|
|
|
|
/*
|
|
* CPU type and hardware bug flags. Kept separately for each CPU.
|
|
*/
|
|
enum cpu_type {
|
|
CPU_SH5_101,
|
|
CPU_SH5_103,
|
|
CPU_SH_NONE
|
|
};
|
|
|
|
/*
|
|
* TLB information structure
|
|
*
|
|
* Defined for both I and D tlb, per-processor.
|
|
*/
|
|
struct tlb_info {
|
|
unsigned long long next;
|
|
unsigned long long first;
|
|
unsigned long long last;
|
|
|
|
unsigned int entries;
|
|
unsigned int step;
|
|
|
|
unsigned long flags;
|
|
};
|
|
|
|
struct sh_cpuinfo {
|
|
enum cpu_type type;
|
|
unsigned long loops_per_jiffy;
|
|
|
|
char hard_math;
|
|
|
|
unsigned long *pgd_quick;
|
|
unsigned long *pmd_quick;
|
|
unsigned long *pte_quick;
|
|
unsigned long pgtable_cache_sz;
|
|
unsigned int cpu_clock, master_clock, bus_clock, module_clock;
|
|
|
|
/* Cache info */
|
|
struct cache_info icache;
|
|
struct cache_info dcache;
|
|
|
|
/* TLB info */
|
|
struct tlb_info itlb;
|
|
struct tlb_info dtlb;
|
|
};
|
|
|
|
extern struct sh_cpuinfo boot_cpu_data;
|
|
|
|
#define cpu_data (&boot_cpu_data)
|
|
#define current_cpu_data boot_cpu_data
|
|
|
|
#endif
|
|
|
|
/*
|
|
* User space process size: 2GB - 4k.
|
|
*/
|
|
#define TASK_SIZE 0x7ffff000UL
|
|
|
|
/* This decides where the kernel will search for a free chunk of vm
|
|
* space during mmap's.
|
|
*/
|
|
#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
|
|
|
|
/*
|
|
* Bit of SR register
|
|
*
|
|
* FD-bit:
|
|
* When it's set, it means the processor doesn't have right to use FPU,
|
|
* and it results exception when the floating operation is executed.
|
|
*
|
|
* IMASK-bit:
|
|
* Interrupt level mask
|
|
*
|
|
* STEP-bit:
|
|
* Single step bit
|
|
*
|
|
*/
|
|
#define SR_FD 0x00008000
|
|
|
|
#if defined(CONFIG_SH64_SR_WATCH)
|
|
#define SR_MMU 0x84000000
|
|
#else
|
|
#define SR_MMU 0x80000000
|
|
#endif
|
|
|
|
#define SR_IMASK 0x000000f0
|
|
#define SR_SSTEP 0x08000000
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
/*
|
|
* FPU structure and data : require 8-byte alignment as we need to access it
|
|
with fld.p, fst.p
|
|
*/
|
|
|
|
struct sh_fpu_hard_struct {
|
|
unsigned long fp_regs[64];
|
|
unsigned int fpscr;
|
|
/* long status; * software status information */
|
|
};
|
|
|
|
#if 0
|
|
/* Dummy fpu emulator */
|
|
struct sh_fpu_soft_struct {
|
|
unsigned long long fp_regs[32];
|
|
unsigned int fpscr;
|
|
unsigned char lookahead;
|
|
unsigned long entry_pc;
|
|
};
|
|
#endif
|
|
|
|
union sh_fpu_union {
|
|
struct sh_fpu_hard_struct hard;
|
|
/* 'hard' itself only produces 32 bit alignment, yet we need
|
|
to access it using 64 bit load/store as well. */
|
|
unsigned long long alignment_dummy;
|
|
};
|
|
|
|
struct thread_struct {
|
|
unsigned long sp;
|
|
unsigned long pc;
|
|
/* This stores the address of the pt_regs built during a context
|
|
switch, or of the register save area built for a kernel mode
|
|
exception. It is used for backtracing the stack of a sleeping task
|
|
or one that traps in kernel mode. */
|
|
struct pt_regs *kregs;
|
|
/* This stores the address of the pt_regs constructed on entry from
|
|
user mode. It is a fixed value over the lifetime of a process, or
|
|
NULL for a kernel thread. */
|
|
struct pt_regs *uregs;
|
|
|
|
unsigned long trap_no, error_code;
|
|
unsigned long address;
|
|
/* Hardware debugging registers may come here */
|
|
|
|
/* floating point info */
|
|
union sh_fpu_union fpu;
|
|
};
|
|
|
|
#define INIT_MMAP \
|
|
{ &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
|
|
|
|
extern struct pt_regs fake_swapper_regs;
|
|
|
|
#define INIT_THREAD { \
|
|
.sp = sizeof(init_stack) + \
|
|
(long) &init_stack, \
|
|
.pc = 0, \
|
|
.kregs = &fake_swapper_regs, \
|
|
.uregs = NULL, \
|
|
.trap_no = 0, \
|
|
.error_code = 0, \
|
|
.address = 0, \
|
|
.fpu = { { { 0, } }, } \
|
|
}
|
|
|
|
/*
|
|
* Do necessary setup to start up a newly executed thread.
|
|
*/
|
|
#define SR_USER (SR_MMU | SR_FD)
|
|
|
|
#define start_thread(regs, new_pc, new_sp) \
|
|
set_fs(USER_DS); \
|
|
regs->sr = SR_USER; /* User mode. */ \
|
|
regs->pc = new_pc - 4; /* Compensate syscall exit */ \
|
|
regs->pc |= 1; /* Set SHmedia ! */ \
|
|
regs->regs[18] = 0; \
|
|
regs->regs[15] = new_sp
|
|
|
|
/* 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 *);
|
|
/*
|
|
* create a kernel thread without removing it from tasklists
|
|
*/
|
|
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(p, mm) do { } while (0)
|
|
#define release_segments(mm) do { } while (0)
|
|
#define forget_segments() do { } while (0)
|
|
#define prepare_to_copy(tsk) do { } while (0)
|
|
/*
|
|
* FPU lazy state save handling.
|
|
*/
|
|
|
|
extern __inline__ void release_fpu(void)
|
|
{
|
|
unsigned long long __dummy;
|
|
|
|
/* Set FD flag in SR */
|
|
__asm__ __volatile__("getcon " __SR ", %0\n\t"
|
|
"or %0, %1, %0\n\t"
|
|
"putcon %0, " __SR "\n\t"
|
|
: "=&r" (__dummy)
|
|
: "r" (SR_FD));
|
|
}
|
|
|
|
extern __inline__ void grab_fpu(void)
|
|
{
|
|
unsigned long long __dummy;
|
|
|
|
/* Clear out FD flag in SR */
|
|
__asm__ __volatile__("getcon " __SR ", %0\n\t"
|
|
"and %0, %1, %0\n\t"
|
|
"putcon %0, " __SR "\n\t"
|
|
: "=&r" (__dummy)
|
|
: "r" (~SR_FD));
|
|
}
|
|
|
|
/* Round to nearest, no exceptions on inexact, overflow, underflow,
|
|
zero-divide, invalid. Configure option for whether to flush denorms to
|
|
zero, or except if a denorm is encountered. */
|
|
#if defined(CONFIG_SH64_FPU_DENORM_FLUSH)
|
|
#define FPSCR_INIT 0x00040000
|
|
#else
|
|
#define FPSCR_INIT 0x00000000
|
|
#endif
|
|
|
|
/* Save the current FP regs */
|
|
void fpsave(struct sh_fpu_hard_struct *fpregs);
|
|
|
|
/* Initialise the FP state of a task */
|
|
void fpinit(struct sh_fpu_hard_struct *fpregs);
|
|
|
|
extern struct task_struct *last_task_used_math;
|
|
|
|
/*
|
|
* Return saved PC of a blocked thread.
|
|
*/
|
|
#define thread_saved_pc(tsk) (tsk->thread.pc)
|
|
|
|
extern unsigned long get_wchan(struct task_struct *p);
|
|
|
|
#define KSTK_EIP(tsk) ((tsk)->thread.pc)
|
|
#define KSTK_ESP(tsk) ((tsk)->thread.sp)
|
|
|
|
#define cpu_relax() do { } while (0)
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif /* __ASM_SH64_PROCESSOR_H */
|
|
|