1 #ifndef __ASM_SH_PROCESSOR_64_H
2 #define __ASM_SH_PROCESSOR_64_H
5 * include/asm-sh/processor_64.h
7 * Copyright (C) 2000, 2001 Paolo Alberelli
8 * Copyright (C) 2003 Paul Mundt
9 * Copyright (C) 2004 Richard Curnow
11 * This file is subject to the terms and conditions of the GNU General Public
12 * License. See the file "COPYING" in the main directory of this archive
17 #include <linux/compiler.h>
19 #include <asm/types.h>
20 #include <cpu/registers.h>
25 * User space process size: 2GB - 4k.
27 #define TASK_SIZE 0x7ffff000UL
29 #define STACK_TOP TASK_SIZE
30 #define STACK_TOP_MAX STACK_TOP
32 /* This decides where the kernel will search for a free chunk of vm
33 * space during mmap's.
35 #define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
41 * When it's set, it means the processor doesn't have right to use FPU,
42 * and it results exception when the floating operation is executed.
45 * Interrupt level mask
51 #if defined(CONFIG_SH64_SR_WATCH)
52 #define SR_MMU 0x84000000
54 #define SR_MMU 0x80000000
57 #define SR_IMASK 0x000000f0
58 #define SR_FD 0x00008000
59 #define SR_SSTEP 0x08000000
64 * FPU structure and data : require 8-byte alignment as we need to access it
68 struct sh_fpu_hard_struct {
69 unsigned long fp_regs[64];
71 /* long status; * software status information */
74 /* Dummy fpu emulator */
75 struct sh_fpu_soft_struct {
76 unsigned long fp_regs[64];
78 unsigned char lookahead;
79 unsigned long entry_pc;
83 struct sh_fpu_hard_struct hardfpu;
84 struct sh_fpu_soft_struct softfpu;
86 * The structure definitions only produce 32 bit alignment, yet we need
87 * to access them using 64 bit load/store as well.
89 unsigned long long alignment_dummy;
92 struct thread_struct {
96 /* Various thread flags, see SH_THREAD_xxx */
99 /* This stores the address of the pt_regs built during a context
100 switch, or of the register save area built for a kernel mode
101 exception. It is used for backtracing the stack of a sleeping task
102 or one that traps in kernel mode. */
103 struct pt_regs *kregs;
104 /* This stores the address of the pt_regs constructed on entry from
105 user mode. It is a fixed value over the lifetime of a process, or
106 NULL for a kernel thread. */
107 struct pt_regs *uregs;
109 unsigned long address;
110 /* Hardware debugging registers may come here */
112 /* floating point info */
113 union thread_xstate *xstate;
116 * fpu_counter contains the number of consecutive context switches
117 * that the FPU is used. If this is over a threshold, the lazy fpu
118 * saving becomes unlazy to save the trap. This is an unsigned char
119 * so that after 256 times the counter wraps and the behavior turns
120 * lazy again; this to deal with bursty apps that only use FPU for
123 unsigned char fpu_counter;
127 { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
129 #define INIT_THREAD { \
130 .sp = sizeof(init_stack) + \
131 (long) &init_stack, \
133 .kregs = &fake_swapper_regs, \
140 * Do necessary setup to start up a newly executed thread.
142 #define SR_USER (SR_MMU | SR_FD)
144 #define start_thread(_regs, new_pc, new_sp) \
145 _regs->sr = SR_USER; /* User mode. */ \
146 _regs->pc = new_pc - 4; /* Compensate syscall exit */ \
147 _regs->pc |= 1; /* Set SHmedia ! */ \
148 _regs->regs[18] = 0; \
149 _regs->regs[15] = new_sp
151 /* Forward declaration, a strange C thing */
155 /* Free all resources held by a thread. */
156 extern void release_thread(struct task_struct *);
159 * FPU lazy state save handling.
162 static inline void disable_fpu(void)
164 unsigned long long __dummy;
166 /* Set FD flag in SR */
167 __asm__ __volatile__("getcon " __SR ", %0\n\t"
169 "putcon %0, " __SR "\n\t"
174 static inline void enable_fpu(void)
176 unsigned long long __dummy;
178 /* Clear out FD flag in SR */
179 __asm__ __volatile__("getcon " __SR ", %0\n\t"
181 "putcon %0, " __SR "\n\t"
186 /* Round to nearest, no exceptions on inexact, overflow, underflow,
187 zero-divide, invalid. Configure option for whether to flush denorms to
188 zero, or except if a denorm is encountered. */
189 #if defined(CONFIG_SH64_FPU_DENORM_FLUSH)
190 #define FPSCR_INIT 0x00040000
192 #define FPSCR_INIT 0x00000000
196 /* Initialise the FP state of a task */
197 void fpinit(struct sh_fpu_hard_struct *fpregs);
199 #define fpinit(fpregs) do { } while (0)
202 extern struct task_struct *last_task_used_math;
205 * Return saved PC of a blocked thread.
207 #define thread_saved_pc(tsk) (tsk->thread.pc)
209 extern unsigned long get_wchan(struct task_struct *p);
211 #define KSTK_EIP(tsk) ((tsk)->thread.pc)
212 #define KSTK_ESP(tsk) ((tsk)->thread.sp)
214 #endif /* __ASSEMBLY__ */
215 #endif /* __ASM_SH_PROCESSOR_64_H */