1 #ifndef __ASM_SH64_PROCESSOR_H
2 #define __ASM_SH64_PROCESSOR_H
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License. See the file "COPYING" in the main directory of this archive
9 * include/asm-sh64/processor.h
11 * Copyright (C) 2000, 2001 Paolo Alberelli
12 * Copyright (C) 2003 Paul Mundt
13 * Copyright (C) 2004 Richard Curnow
21 #include <asm/types.h>
22 #include <asm/cache.h>
23 #include <asm/registers.h>
24 #include <linux/threads.h>
27 * Default implementation of macro that returns current
28 * instruction pointer ("program counter").
30 #define current_text_addr() ({ \
32 unsigned long long __dummy = 0; \
33 __asm__("gettr tr0, %1\n\t" \
37 :"=r" (pc), "=r" (__dummy) \
42 * CPU type and hardware bug flags. Kept separately for each CPU.
51 * TLB information structure
53 * Defined for both I and D tlb, per-processor.
56 unsigned long long next;
57 unsigned long long first;
58 unsigned long long last;
68 unsigned long loops_per_jiffy;
72 unsigned long *pgd_quick;
73 unsigned long *pmd_quick;
74 unsigned long *pte_quick;
75 unsigned long pgtable_cache_sz;
76 unsigned int cpu_clock, master_clock, bus_clock, module_clock;
79 struct cache_info icache;
80 struct cache_info dcache;
87 extern struct sh_cpuinfo boot_cpu_data;
89 #define cpu_data (&boot_cpu_data)
90 #define current_cpu_data boot_cpu_data
95 * User space process size: 2GB - 4k.
97 #define TASK_SIZE 0x7ffff000UL
99 /* This decides where the kernel will search for a free chunk of vm
100 * space during mmap's.
102 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
108 * When it's set, it means the processor doesn't have right to use FPU,
109 * and it results exception when the floating operation is executed.
112 * Interrupt level mask
118 #define SR_FD 0x00008000
120 #if defined(CONFIG_SH64_SR_WATCH)
121 #define SR_MMU 0x84000000
123 #define SR_MMU 0x80000000
126 #define SR_IMASK 0x000000f0
127 #define SR_SSTEP 0x08000000
132 * FPU structure and data : require 8-byte alignment as we need to access it
136 struct sh_fpu_hard_struct {
137 unsigned long fp_regs[64];
139 /* long status; * software status information */
143 /* Dummy fpu emulator */
144 struct sh_fpu_soft_struct {
145 unsigned long long fp_regs[32];
147 unsigned char lookahead;
148 unsigned long entry_pc;
153 struct sh_fpu_hard_struct hard;
154 /* 'hard' itself only produces 32 bit alignment, yet we need
155 to access it using 64 bit load/store as well. */
156 unsigned long long alignment_dummy;
159 struct thread_struct {
162 /* This stores the address of the pt_regs built during a context
163 switch, or of the register save area built for a kernel mode
164 exception. It is used for backtracing the stack of a sleeping task
165 or one that traps in kernel mode. */
166 struct pt_regs *kregs;
167 /* This stores the address of the pt_regs constructed on entry from
168 user mode. It is a fixed value over the lifetime of a process, or
169 NULL for a kernel thread. */
170 struct pt_regs *uregs;
172 unsigned long trap_no, error_code;
173 unsigned long address;
174 /* Hardware debugging registers may come here */
176 /* floating point info */
177 union sh_fpu_union fpu;
181 { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
183 extern struct pt_regs fake_swapper_regs;
185 #define INIT_THREAD { \
186 .sp = sizeof(init_stack) + \
187 (long) &init_stack, \
189 .kregs = &fake_swapper_regs, \
194 .fpu = { { { 0, } }, } \
198 * Do necessary setup to start up a newly executed thread.
200 #define SR_USER (SR_MMU | SR_FD)
202 #define start_thread(regs, new_pc, new_sp) \
204 regs->sr = SR_USER; /* User mode. */ \
205 regs->pc = new_pc - 4; /* Compensate syscall exit */ \
206 regs->pc |= 1; /* Set SHmedia ! */ \
207 regs->regs[18] = 0; \
208 regs->regs[15] = new_sp
210 /* Forward declaration, a strange C thing */
214 /* Free all resources held by a thread. */
215 extern void release_thread(struct task_struct *);
217 * create a kernel thread without removing it from tasklists
219 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
222 /* Copy and release all segment info associated with a VM */
223 #define copy_segments(p, mm) do { } while (0)
224 #define release_segments(mm) do { } while (0)
225 #define forget_segments() do { } while (0)
226 #define prepare_to_copy(tsk) do { } while (0)
228 * FPU lazy state save handling.
231 static inline void release_fpu(void)
233 unsigned long long __dummy;
235 /* Set FD flag in SR */
236 __asm__ __volatile__("getcon " __SR ", %0\n\t"
238 "putcon %0, " __SR "\n\t"
243 static inline void grab_fpu(void)
245 unsigned long long __dummy;
247 /* Clear out FD flag in SR */
248 __asm__ __volatile__("getcon " __SR ", %0\n\t"
250 "putcon %0, " __SR "\n\t"
255 /* Round to nearest, no exceptions on inexact, overflow, underflow,
256 zero-divide, invalid. Configure option for whether to flush denorms to
257 zero, or except if a denorm is encountered. */
258 #if defined(CONFIG_SH64_FPU_DENORM_FLUSH)
259 #define FPSCR_INIT 0x00040000
261 #define FPSCR_INIT 0x00000000
264 /* Save the current FP regs */
265 void fpsave(struct sh_fpu_hard_struct *fpregs);
267 /* Initialise the FP state of a task */
268 void fpinit(struct sh_fpu_hard_struct *fpregs);
270 extern struct task_struct *last_task_used_math;
273 * Return saved PC of a blocked thread.
275 #define thread_saved_pc(tsk) (tsk->thread.pc)
277 extern unsigned long get_wchan(struct task_struct *p);
279 #define KSTK_EIP(tsk) ((tsk)->thread.pc)
280 #define KSTK_ESP(tsk) ((tsk)->thread.sp)
282 #define cpu_relax() do { } while (0)
284 #endif /* __ASSEMBLY__ */
285 #endif /* __ASM_SH64_PROCESSOR_H */