1#ifndef __ASM_SH64_PROCESSOR_H
2#define __ASM_SH64_PROCESSOR_H
3
4/*
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
7 * for more details.
8 *
9 * include/asm-sh64/processor.h
10 *
11 * Copyright (C) 2000, 2001  Paolo Alberelli
12 * Copyright (C) 2003  Paul Mundt
13 * Copyright (C) 2004  Richard Curnow
14 *
15 */
16
17#include <asm/page.h>
18
19#ifndef __ASSEMBLY__
20
21#include <asm/types.h>
22#include <asm/cache.h>
23#include <asm/registers.h>
24#include <linux/threads.h>
25#include <linux/compiler.h>
26
27/*
28 * Default implementation of macro that returns current
29 * instruction pointer ("program counter").
30 */
31#define current_text_addr() ({ \
32void *pc; \
33unsigned long long __dummy = 0; \
34__asm__("gettr	tr0, %1\n\t" \
35	"pta	4, tr0\n\t" \
36	"gettr	tr0, %0\n\t" \
37	"ptabs	%1, tr0\n\t"	\
38	:"=r" (pc), "=r" (__dummy) \
39	: "1" (__dummy)); \
40pc; })
41
42/*
43 *  CPU type and hardware bug flags. Kept separately for each CPU.
44 */
45enum cpu_type {
46	CPU_SH5_101,
47	CPU_SH5_103,
48	CPU_SH_NONE
49};
50
51/*
52 * TLB information structure
53 *
54 * Defined for both I and D tlb, per-processor.
55 */
56struct tlb_info {
57	unsigned long long next;
58	unsigned long long first;
59	unsigned long long last;
60
61	unsigned int entries;
62	unsigned int step;
63
64	unsigned long flags;
65};
66
67struct sh_cpuinfo {
68	enum cpu_type type;
69	unsigned long loops_per_jiffy;
70
71	char	hard_math;
72
73	unsigned long *pgd_quick;
74	unsigned long *pmd_quick;
75	unsigned long *pte_quick;
76	unsigned long pgtable_cache_sz;
77	unsigned int cpu_clock, master_clock, bus_clock, module_clock;
78
79	/* Cache info */
80	struct cache_info icache;
81	struct cache_info dcache;
82
83	/* TLB info */
84	struct tlb_info itlb;
85	struct tlb_info dtlb;
86};
87
88extern struct sh_cpuinfo boot_cpu_data;
89
90#define cpu_data (&boot_cpu_data)
91#define current_cpu_data boot_cpu_data
92
93#endif
94
95/*
96 * User space process size: 2GB - 4k.
97 */
98#define TASK_SIZE	0x7ffff000UL
99
100/* This decides where the kernel will search for a free chunk of vm
101 * space during mmap's.
102 */
103#define TASK_UNMAPPED_BASE	(TASK_SIZE / 3)
104
105/*
106 * Bit of SR register
107 *
108 * FD-bit:
109 *     When it's set, it means the processor doesn't have right to use FPU,
110 *     and it results exception when the floating operation is executed.
111 *
112 * IMASK-bit:
113 *     Interrupt level mask
114 *
115 * STEP-bit:
116 *     Single step bit
117 *
118 */
119#define SR_FD    0x00008000
120
121#if defined(CONFIG_SH64_SR_WATCH)
122#define SR_MMU   0x84000000
123#else
124#define SR_MMU   0x80000000
125#endif
126
127#define SR_IMASK 0x000000f0
128#define SR_SSTEP 0x08000000
129
130#ifndef __ASSEMBLY__
131
132/*
133 * FPU structure and data : require 8-byte alignment as we need to access it
134   with fld.p, fst.p
135 */
136
137struct sh_fpu_hard_struct {
138	unsigned long fp_regs[64];
139	unsigned int fpscr;
140	/* long status; * software status information */
141};
142
143
144union sh_fpu_union {
145	struct sh_fpu_hard_struct hard;
146	/* 'hard' itself only produces 32 bit alignment, yet we need
147	   to access it using 64 bit load/store as well. */
148	unsigned long long alignment_dummy;
149};
150
151struct thread_struct {
152	unsigned long sp;
153	unsigned long pc;
154	/* This stores the address of the pt_regs built during a context
155	   switch, or of the register save area built for a kernel mode
156	   exception.  It is used for backtracing the stack of a sleeping task
157	   or one that traps in kernel mode. */
158        struct pt_regs *kregs;
159	/* This stores the address of the pt_regs constructed on entry from
160	   user mode.  It is a fixed value over the lifetime of a process, or
161	   NULL for a kernel thread. */
162	struct pt_regs *uregs;
163
164	unsigned long trap_no, error_code;
165	unsigned long address;
166	/* Hardware debugging registers may come here */
167
168	/* floating point info */
169	union sh_fpu_union fpu;
170};
171
172#define INIT_MMAP \
173{ &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
174
175extern  struct pt_regs fake_swapper_regs;
176
177#define INIT_THREAD  {				\
178	.sp		= sizeof(init_stack) +	\
179			  (long) &init_stack,	\
180	.pc		= 0,			\
181        .kregs		= &fake_swapper_regs,	\
182	.uregs	        = NULL,			\
183	.trap_no	= 0,			\
184	.error_code	= 0,			\
185	.address	= 0,			\
186	.fpu		= { { { 0, } }, }	\
187}
188
189/*
190 * Do necessary setup to start up a newly executed thread.
191 */
192#define SR_USER (SR_MMU | SR_FD)
193
194#define start_thread(regs, new_pc, new_sp) 	 		\
195	set_fs(USER_DS);			 		\
196	regs->sr = SR_USER;	/* User mode. */ 		\
197	regs->pc = new_pc - 4;	/* Compensate syscall exit */	\
198	regs->pc |= 1;		/* Set SHmedia ! */		\
199	regs->regs[18] = 0;   		 	 		\
200	regs->regs[15] = new_sp
201
202/* Forward declaration, a strange C thing */
203struct task_struct;
204struct mm_struct;
205
206/* Free all resources held by a thread. */
207extern void release_thread(struct task_struct *);
208/*
209 * create a kernel thread without removing it from tasklists
210 */
211extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
212
213
214/* Copy and release all segment info associated with a VM */
215#define copy_segments(p, mm)	do { } while (0)
216#define release_segments(mm)	do { } while (0)
217#define forget_segments()	do { } while (0)
218#define prepare_to_copy(tsk)	do { } while (0)
219/*
220 * FPU lazy state save handling.
221 */
222
223static inline void release_fpu(void)
224{
225	unsigned long long __dummy;
226
227	/* Set FD flag in SR */
228	__asm__ __volatile__("getcon	" __SR ", %0\n\t"
229			     "or	%0, %1, %0\n\t"
230			     "putcon	%0, " __SR "\n\t"
231			     : "=&r" (__dummy)
232			     : "r" (SR_FD));
233}
234
235static inline void grab_fpu(void)
236{
237	unsigned long long __dummy;
238
239	/* Clear out FD flag in SR */
240	__asm__ __volatile__("getcon	" __SR ", %0\n\t"
241			     "and	%0, %1, %0\n\t"
242			     "putcon	%0, " __SR "\n\t"
243			     : "=&r" (__dummy)
244			     : "r" (~SR_FD));
245}
246
247/* Round to nearest, no exceptions on inexact, overflow, underflow,
248   zero-divide, invalid.  Configure option for whether to flush denorms to
249   zero, or except if a denorm is encountered.  */
250#if defined(CONFIG_SH64_FPU_DENORM_FLUSH)
251#define FPSCR_INIT  0x00040000
252#else
253#define FPSCR_INIT  0x00000000
254#endif
255
256/* Save the current FP regs */
257void fpsave(struct sh_fpu_hard_struct *fpregs);
258
259/* Initialise the FP state of a task */
260void fpinit(struct sh_fpu_hard_struct *fpregs);
261
262extern struct task_struct *last_task_used_math;
263
264/*
265 * Return saved PC of a blocked thread.
266 */
267#define thread_saved_pc(tsk)	(tsk->thread.pc)
268
269extern unsigned long get_wchan(struct task_struct *p);
270
271#define KSTK_EIP(tsk)  ((tsk)->thread.pc)
272#define KSTK_ESP(tsk)  ((tsk)->thread.sp)
273
274#define cpu_relax()	barrier()
275
276#endif	/* __ASSEMBLY__ */
277#endif /* __ASM_SH64_PROCESSOR_H */
278