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/cpu/registers.h>
24 * Default implementation of macro that returns current
25 * instruction pointer ("program counter").
27 #define current_text_addr() ({ \
29 unsigned long long __dummy = 0; \
30 __asm__("gettr tr0, %1\n\t" \
34 :"=r" (pc), "=r" (__dummy) \
39 * TLB information structure
41 * Defined for both I and D tlb, per-processor.
44 unsigned long long next;
45 unsigned long long first;
46 unsigned long long last;
56 unsigned long loops_per_jiffy;
57 unsigned long asid_cache;
59 unsigned int cpu_clock, master_clock, bus_clock, module_clock;
62 struct cache_info icache;
63 struct cache_info dcache;
64 struct cache_info scache;
71 extern struct sh_cpuinfo boot_cpu_data;
73 #define cpu_data (&boot_cpu_data)
74 #define current_cpu_data boot_cpu_data
79 * User space process size: 2GB - 4k.
81 #define TASK_SIZE 0x7ffff000UL
83 /* This decides where the kernel will search for a free chunk of vm
84 * space during mmap's.
86 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
92 * When it's set, it means the processor doesn't have right to use FPU,
93 * and it results exception when the floating operation is executed.
96 * Interrupt level mask
102 #define SR_FD 0x00008000
104 #if defined(CONFIG_SH64_SR_WATCH)
105 #define SR_MMU 0x84000000
107 #define SR_MMU 0x80000000
110 #define SR_IMASK 0x000000f0
111 #define SR_SSTEP 0x08000000
116 * FPU structure and data : require 8-byte alignment as we need to access it
120 struct sh_fpu_hard_struct {
121 unsigned long fp_regs[64];
123 /* long status; * software status information */
127 /* Dummy fpu emulator */
128 struct sh_fpu_soft_struct {
129 unsigned long long fp_regs[32];
131 unsigned char lookahead;
132 unsigned long entry_pc;
137 struct sh_fpu_hard_struct hard;
138 /* 'hard' itself only produces 32 bit alignment, yet we need
139 to access it using 64 bit load/store as well. */
140 unsigned long long alignment_dummy;
143 struct thread_struct {
146 /* This stores the address of the pt_regs built during a context
147 switch, or of the register save area built for a kernel mode
148 exception. It is used for backtracing the stack of a sleeping task
149 or one that traps in kernel mode. */
150 struct pt_regs *kregs;
151 /* This stores the address of the pt_regs constructed on entry from
152 user mode. It is a fixed value over the lifetime of a process, or
153 NULL for a kernel thread. */
154 struct pt_regs *uregs;
156 unsigned long trap_no, error_code;
157 unsigned long address;
158 /* Hardware debugging registers may come here */
160 /* floating point info */
161 union sh_fpu_union fpu;
169 { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
171 extern struct pt_regs fake_swapper_regs;
173 #define INIT_THREAD { \
174 .sp = sizeof(init_stack) + \
175 (long) &init_stack, \
177 .kregs = &fake_swapper_regs, \
182 .fpu = { { { 0, } }, } \
186 * Do necessary setup to start up a newly executed thread.
188 #define SR_USER (SR_MMU | SR_FD)
190 #define start_thread(regs, new_pc, new_sp) \
192 regs->sr = SR_USER; /* User mode. */ \
193 regs->pc = new_pc - 4; /* Compensate syscall exit */ \
194 regs->pc |= 1; /* Set SHmedia ! */ \
195 regs->regs[18] = 0; \
196 regs->regs[15] = new_sp
198 /* Forward declaration, a strange C thing */
202 /* Free all resources held by a thread. */
203 extern void release_thread(struct task_struct *);
205 * create a kernel thread without removing it from tasklists
207 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
210 /* Copy and release all segment info associated with a VM */
211 #define copy_segments(p, mm) do { } while (0)
212 #define release_segments(mm) do { } while (0)
213 #define forget_segments() do { } while (0)
214 #define prepare_to_copy(tsk) do { } while (0)
216 * FPU lazy state save handling.
219 static inline void release_fpu(void)
221 unsigned long long __dummy;
223 /* Set FD flag in SR */
224 __asm__ __volatile__("getcon " __SR ", %0\n\t"
226 "putcon %0, " __SR "\n\t"
231 static inline void grab_fpu(void)
233 unsigned long long __dummy;
235 /* Clear out FD flag in SR */
236 __asm__ __volatile__("getcon " __SR ", %0\n\t"
238 "putcon %0, " __SR "\n\t"
243 /* Round to nearest, no exceptions on inexact, overflow, underflow,
244 zero-divide, invalid. Configure option for whether to flush denorms to
245 zero, or except if a denorm is encountered. */
246 #if defined(CONFIG_SH64_FPU_DENORM_FLUSH)
247 #define FPSCR_INIT 0x00040000
249 #define FPSCR_INIT 0x00000000
252 /* Save the current FP regs */
253 void fpsave(struct sh_fpu_hard_struct *fpregs);
255 /* Initialise the FP state of a task */
256 void fpinit(struct sh_fpu_hard_struct *fpregs);
258 extern struct task_struct *last_task_used_math;
261 * Return saved PC of a blocked thread.
263 #define thread_saved_pc(tsk) (tsk->thread.pc)
265 extern unsigned long get_wchan(struct task_struct *p);
267 #define KSTK_EIP(tsk) ((tsk)->thread.pc)
268 #define KSTK_ESP(tsk) ((tsk)->thread.sp)
270 #define cpu_relax() barrier()
272 #endif /* __ASSEMBLY__ */
273 #endif /* __ASM_SH_PROCESSOR_64_H */