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 <asm/cache.h>
21 #include <asm/ptrace.h>
22 #include <asm/cpu/registers.h>
25 * Default implementation of macro that returns current
26 * instruction pointer ("program counter").
28 #define current_text_addr() ({ \
30 unsigned long long __dummy = 0; \
31 __asm__("gettr tr0, %1\n\t" \
35 :"=r" (pc), "=r" (__dummy) \
40 * TLB information structure
42 * Defined for both I and D tlb, per-processor.
45 unsigned long long next;
46 unsigned long long first;
47 unsigned long long last;
57 unsigned long loops_per_jiffy;
58 unsigned long asid_cache;
60 unsigned int cpu_clock, master_clock, bus_clock, module_clock;
63 struct cache_info icache;
64 struct cache_info dcache;
65 struct cache_info scache;
74 extern struct sh_cpuinfo cpu_data[];
75 #define boot_cpu_data cpu_data[0]
76 #define current_cpu_data cpu_data[smp_processor_id()]
77 #define raw_current_cpu_data cpu_data[raw_smp_processor_id()]
82 * User space process size: 2GB - 4k.
84 #define TASK_SIZE 0x7ffff000UL
86 /* This decides where the kernel will search for a free chunk of vm
87 * space during mmap's.
89 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
95 * When it's set, it means the processor doesn't have right to use FPU,
96 * and it results exception when the floating operation is executed.
99 * Interrupt level mask
105 #define SR_FD 0x00008000
107 #if defined(CONFIG_SH64_SR_WATCH)
108 #define SR_MMU 0x84000000
110 #define SR_MMU 0x80000000
113 #define SR_IMASK 0x000000f0
114 #define SR_SSTEP 0x08000000
119 * FPU structure and data : require 8-byte alignment as we need to access it
123 struct sh_fpu_hard_struct {
124 unsigned long fp_regs[64];
126 /* long status; * software status information */
130 /* Dummy fpu emulator */
131 struct sh_fpu_soft_struct {
132 unsigned long long fp_regs[32];
134 unsigned char lookahead;
135 unsigned long entry_pc;
140 struct sh_fpu_hard_struct hard;
141 /* 'hard' itself only produces 32 bit alignment, yet we need
142 to access it using 64 bit load/store as well. */
143 unsigned long long alignment_dummy;
146 struct thread_struct {
149 /* This stores the address of the pt_regs built during a context
150 switch, or of the register save area built for a kernel mode
151 exception. It is used for backtracing the stack of a sleeping task
152 or one that traps in kernel mode. */
153 struct pt_regs *kregs;
154 /* This stores the address of the pt_regs constructed on entry from
155 user mode. It is a fixed value over the lifetime of a process, or
156 NULL for a kernel thread. */
157 struct pt_regs *uregs;
159 unsigned long trap_no, error_code;
160 unsigned long address;
161 /* Hardware debugging registers may come here */
163 /* floating point info */
164 union sh_fpu_union fpu;
172 { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
174 extern struct pt_regs fake_swapper_regs;
176 #define INIT_THREAD { \
177 .sp = sizeof(init_stack) + \
178 (long) &init_stack, \
180 .kregs = &fake_swapper_regs, \
185 .fpu = { { { 0, } }, } \
189 * Do necessary setup to start up a newly executed thread.
191 #define SR_USER (SR_MMU | SR_FD)
193 #define start_thread(regs, new_pc, new_sp) \
195 regs->sr = SR_USER; /* User mode. */ \
196 regs->pc = new_pc - 4; /* Compensate syscall exit */ \
197 regs->pc |= 1; /* Set SHmedia ! */ \
198 regs->regs[18] = 0; \
199 regs->regs[15] = new_sp
201 /* Forward declaration, a strange C thing */
205 /* Free all resources held by a thread. */
206 extern void release_thread(struct task_struct *);
208 * create a kernel thread without removing it from tasklists
210 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
213 /* Copy and release all segment info associated with a VM */
214 #define copy_segments(p, mm) do { } while (0)
215 #define release_segments(mm) do { } while (0)
216 #define forget_segments() do { } while (0)
217 #define prepare_to_copy(tsk) do { } while (0)
219 * FPU lazy state save handling.
222 static inline void disable_fpu(void)
224 unsigned long long __dummy;
226 /* Set FD flag in SR */
227 __asm__ __volatile__("getcon " __SR ", %0\n\t"
229 "putcon %0, " __SR "\n\t"
234 static inline void enable_fpu(void)
236 unsigned long long __dummy;
238 /* Clear out FD flag in SR */
239 __asm__ __volatile__("getcon " __SR ", %0\n\t"
241 "putcon %0, " __SR "\n\t"
246 static inline void release_fpu(struct pt_regs *regs)
251 static inline void grab_fpu(struct pt_regs *regs)
256 /* Round to nearest, no exceptions on inexact, overflow, underflow,
257 zero-divide, invalid. Configure option for whether to flush denorms to
258 zero, or except if a denorm is encountered. */
259 #if defined(CONFIG_SH64_FPU_DENORM_FLUSH)
260 #define FPSCR_INIT 0x00040000
262 #define FPSCR_INIT 0x00000000
265 /* Save the current FP regs */
266 void fpsave(struct sh_fpu_hard_struct *fpregs);
268 /* Initialise the FP state of a task */
269 void fpinit(struct sh_fpu_hard_struct *fpregs);
271 extern struct task_struct *last_task_used_math;
274 * Return saved PC of a blocked thread.
276 #define thread_saved_pc(tsk) (tsk->thread.pc)
278 extern unsigned long get_wchan(struct task_struct *p);
280 #define KSTK_EIP(tsk) ((tsk)->thread.pc)
281 #define KSTK_ESP(tsk) ((tsk)->thread.sp)
283 #define cpu_relax() barrier()
285 #endif /* __ASSEMBLY__ */
286 #endif /* __ASM_SH_PROCESSOR_64_H */