1 /* $Id: system.h,v 1.84 2000/09/23 02:11:22 davem Exp $ */
2 #include <linux/config.h>
3
4 #ifndef __SPARC_SYSTEM_H
5 #define __SPARC_SYSTEM_H
6
7 #include <linux/kernel.h>
8
9 #include <asm/segment.h>
10
11 #ifdef __KERNEL__
12 #include <asm/page.h>
13 #include <asm/oplib.h>
14 #include <asm/psr.h>
15 #include <asm/ptrace.h>
16 #include <asm/btfixup.h>
17
18 #endif /* __KERNEL__ */
19
20 #ifndef __ASSEMBLY__
21
22 /*
23 * Sparc (general) CPU types
24 */
25 enum sparc_cpu {
26 sun4 = 0x00,
27 sun4c = 0x01,
28 sun4m = 0x02,
29 sun4d = 0x03,
30 sun4e = 0x04,
31 sun4u = 0x05, /* V8 ploos ploos */
32 sun_unknown = 0x06,
33 ap1000 = 0x07, /* almost a sun4m */
34 };
35
36 /* Really, userland should not be looking at any of this... */
37 #ifdef __KERNEL__
38
39 extern enum sparc_cpu sparc_cpu_model;
40
41 #ifndef CONFIG_SUN4
42 #define ARCH_SUN4C_SUN4 (sparc_cpu_model==sun4c)
43 #define ARCH_SUN4 0
44 #else
45 #define ARCH_SUN4C_SUN4 1
46 #define ARCH_SUN4 1
47 #endif
48
49 #define SUN4M_NCPUS 4 /* Architectural limit of sun4m. */
50
51 extern unsigned long empty_bad_page;
52 extern unsigned long empty_bad_page_table;
53 extern unsigned long empty_zero_page;
54
55 extern struct linux_romvec *romvec;
56 #define halt() romvec->pv_halt()
57
58 /* When a context switch happens we must flush all user windows so that
59 * the windows of the current process are flushed onto its stack. This
60 * way the windows are all clean for the next process and the stack
61 * frames are up to date.
62 */
63 extern void flush_user_windows(void);
64 extern void kill_user_windows(void);
65 extern void synchronize_user_stack(void);
66 extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
67 void *fpqueue, unsigned long *fpqdepth);
68
69 #ifdef CONFIG_SMP
70 #define SWITCH_ENTER \
71 if(prev->flags & PF_USEDFPU) { \
72 put_psr(get_psr() | PSR_EF); \
73 fpsave(&prev->thread.float_regs[0], &prev->thread.fsr, \
74 &prev->thread.fpqueue[0], &prev->thread.fpqdepth); \
75 prev->flags &= ~PF_USEDFPU; \
76 prev->thread.kregs->psr &= ~PSR_EF; \
77 }
78
79 #define SWITCH_DO_LAZY_FPU
80 #else
81 #define SWITCH_ENTER
82 #define SWITCH_DO_LAZY_FPU if(last_task_used_math != next) next->thread.kregs->psr&=~PSR_EF;
83 #endif
84
85 /*
86 * Flush windows so that the VM switch which follows
87 * would not pull the stack from under us.
88 *
89 * SWITCH_ENTER and SWITH_DO_LAZY_FPU do not work yet (e.g. SMP does not work)
90 */
91 #define prepare_to_switch() do { \
92 __asm__ __volatile__( \
93 ".globl\tflush_patch_switch\nflush_patch_switch:\n\t" \
94 "save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \
95 "save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \
96 "save %sp, -0x40, %sp\n\t" \
97 "restore; restore; restore; restore; restore; restore; restore"); \
98 } while(0)
99
100 /* Much care has gone into this code, do not touch it.
101 *
102 * We need to loadup regs l0/l1 for the newly forked child
103 * case because the trap return path relies on those registers
104 * holding certain values, gcc is told that they are clobbered.
105 * Gcc needs registers for 3 values in and 1 value out, so we
106 * clobber every non-fixed-usage register besides l2/l3/o4/o5. -DaveM
107 *
108 * Hey Dave, that do not touch sign is too much of an incentive
109 * - Anton
110 */
111 #define switch_to(prev, next, last) do { \
112 __label__ here; \
113 register unsigned long task_pc asm("o7"); \
114 extern struct task_struct *current_set[NR_CPUS]; \
115 SWITCH_ENTER \
116 SWITCH_DO_LAZY_FPU \
117 next->active_mm->cpu_vm_mask |= (1 << smp_processor_id()); \
118 task_pc = ((unsigned long) &&here) - 0x8; \
119 __asm__ __volatile__( \
120 "mov %%g6, %%g3\n\t" \
121 "rd %%psr, %%g4\n\t" \
122 "std %%sp, [%%g6 + %4]\n\t" \
123 "rd %%wim, %%g5\n\t" \
124 "wr %%g4, 0x20, %%psr\n\t" \
125 "nop\n\t" \
126 "std %%g4, [%%g6 + %3]\n\t" \
127 "ldd [%2 + %3], %%g4\n\t" \
128 "mov %2, %%g6\n\t" \
129 ".globl patchme_store_new_current\n" \
130 "patchme_store_new_current:\n\t" \
131 "st %2, [%1]\n\t" \
132 "wr %%g4, 0x20, %%psr\n\t" \
133 "nop\n\t" \
134 "nop\n\t" \
135 "ldd [%%g6 + %4], %%sp\n\t" \
136 "wr %%g5, 0x0, %%wim\n\t" \
137 "ldd [%%sp + 0x00], %%l0\n\t" \
138 "ldd [%%sp + 0x38], %%i6\n\t" \
139 "wr %%g4, 0x0, %%psr\n\t" \
140 "nop\n\t" \
141 "nop\n\t" \
142 "jmpl %%o7 + 0x8, %%g0\n\t" \
143 " mov %%g3, %0\n\t" \
144 : "=&r" (last) \
145 : "r" (&(current_set[hard_smp_processor_id()])), "r" (next), \
146 "i" ((const unsigned long)(&((struct task_struct *)0)->thread.kpsr)), \
147 "i" ((const unsigned long)(&((struct task_struct *)0)->thread.ksp)), \
148 "r" (task_pc) \
149 : "g1", "g2", "g3", "g4", "g5", "g7", "l0", "l1", \
150 "l4", "l5", "l6", "l7", "i0", "i1", "i2", "i3", "i4", "i5", "o0", "o1", "o2", \
151 "o3"); \
152 here: } while(0)
153
154 /*
155 * Changing the IRQ level on the Sparc.
156 */
157 extern __inline__ void setipl(unsigned long __orig_psr)
158 {
159 __asm__ __volatile__("
160 wr %0, 0x0, %%psr
161 nop; nop; nop
162 " : /* no outputs */
163 : "r" (__orig_psr)
164 : "memory", "cc");
165 }
166
167 extern __inline__ void __cli(void)
168 {
169 unsigned long tmp;
170
171 __asm__ __volatile__("
172 rd %%psr, %0
173 nop; nop; nop; /* Sun4m + Cypress + SMP bug */
174 or %0, %1, %0
175 wr %0, 0x0, %%psr
176 nop; nop; nop
177 " : "=r" (tmp)
178 : "i" (PSR_PIL)
179 : "memory");
180 }
181
182 extern __inline__ void __sti(void)
183 {
184 unsigned long tmp;
185
186 __asm__ __volatile__("
187 rd %%psr, %0
188 nop; nop; nop; /* Sun4m + Cypress + SMP bug */
189 andn %0, %1, %0
190 wr %0, 0x0, %%psr
191 nop; nop; nop
192 " : "=r" (tmp)
193 : "i" (PSR_PIL)
194 : "memory");
195 }
196
197 extern __inline__ unsigned long getipl(void)
198 {
199 unsigned long retval;
200
201 __asm__ __volatile__("rd %%psr, %0" : "=r" (retval));
202 return retval;
203 }
204
205 extern __inline__ unsigned long swap_pil(unsigned long __new_psr)
206 {
207 unsigned long retval;
208
209 __asm__ __volatile__("
210 rd %%psr, %0
211 nop; nop; nop; /* Sun4m + Cypress + SMP bug */
212 and %0, %2, %%g1
213 and %1, %2, %%g2
214 xorcc %%g1, %%g2, %%g0
215 be 1f
216 nop
217 wr %0, %2, %%psr
218 nop; nop; nop;
219 1:
220 " : "=r" (retval)
221 : "r" (__new_psr), "i" (PSR_PIL)
222 : "g1", "g2", "memory", "cc");
223
224 return retval;
225 }
226
227 extern __inline__ unsigned long read_psr_and_cli(void)
228 {
229 unsigned long retval;
230
231 __asm__ __volatile__("
232 rd %%psr, %0
233 nop; nop; nop; /* Sun4m + Cypress + SMP bug */
234 or %0, %1, %%g1
235 wr %%g1, 0x0, %%psr
236 nop; nop; nop
237 " : "=r" (retval)
238 : "i" (PSR_PIL)
239 : "g1", "memory");
240
241 return retval;
242 }
243
244 #define __save_flags(flags) ((flags) = getipl())
245 #define __save_and_cli(flags) ((flags) = read_psr_and_cli())
246 #define __restore_flags(flags) setipl((flags))
247 #define local_irq_disable() __cli()
248 #define local_irq_enable() __sti()
249 #define local_irq_save(flags) __save_and_cli(flags)
250 #define local_irq_restore(flags) __restore_flags(flags)
251
252 #ifdef CONFIG_SMP
253
254 extern unsigned char global_irq_holder;
255
256 #define save_and_cli(flags) do { save_flags(flags); cli(); } while(0)
257
258 extern void __global_cli(void);
259 extern void __global_sti(void);
260 extern unsigned long __global_save_flags(void);
261 extern void __global_restore_flags(unsigned long flags);
262 #define cli() __global_cli()
263 #define sti() __global_sti()
264 #define save_flags(flags) ((flags)=__global_save_flags())
265 #define restore_flags(flags) __global_restore_flags(flags)
266
267 #else
268
269 #define cli() __cli()
270 #define sti() __sti()
271 #define save_flags(x) __save_flags(x)
272 #define restore_flags(x) __restore_flags(x)
273 #define save_and_cli(x) __save_and_cli(x)
274
275 #endif
276
277 /* XXX Change this if we ever use a PSO mode kernel. */
278 #define mb() __asm__ __volatile__ ("" : : : "memory")
279 #define rmb() mb()
280 #define wmb() mb()
281 #define set_mb(__var, __value) do { __var = __value; mb(); } while(0)
282 #define set_wmb(__var, __value) set_mb(__var, __value)
283 #define smp_mb() __asm__ __volatile__("":::"memory");
284 #define smp_rmb() __asm__ __volatile__("":::"memory");
285 #define smp_wmb() __asm__ __volatile__("":::"memory");
286
287 #define nop() __asm__ __volatile__ ("nop");
288
289 /* This has special calling conventions */
290 #ifndef CONFIG_SMP
291 BTFIXUPDEF_CALL(void, ___xchg32, void)
292 #endif
293
294 extern __inline__ unsigned long xchg_u32(__volatile__ unsigned long *m, unsigned long val)
295 {
296 #ifdef CONFIG_SMP
297 __asm__ __volatile__("swap [%2], %0"
298 : "=&r" (val)
299 : "" (val), "r" (m));
300 return val;
301 #else
302 register unsigned long *ptr asm("g1");
303 register unsigned long ret asm("g2");
304
305 ptr = (unsigned long *) m;
306 ret = val;
307
308 /* Note: this is magic and the nop there is
309 really needed. */
310 __asm__ __volatile__("
311 mov %%o7, %%g4
312 call ___f____xchg32
313 nop
314 " : "=&r" (ret)
315 : "" (ret), "r" (ptr)
316 : "g3", "g4", "g7", "memory", "cc");
317
318 return ret;
319 #endif
320 }
321
322 #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
323 #define tas(ptr) (xchg((ptr),1))
324
325 extern void __xchg_called_with_bad_pointer(void);
326
327 static __inline__ unsigned long __xchg(unsigned long x, __volatile__ void * ptr, int size)
328 {
329 switch (size) {
330 case 4:
331 return xchg_u32(ptr, x);
332 };
333 __xchg_called_with_bad_pointer();
334 return x;
335 }
336
337 extern void die_if_kernel(char *str, struct pt_regs *regs) __attribute__ ((noreturn));
338
339 #endif /* __KERNEL__ */
340
341 #endif /* __ASSEMBLY__ */
342
343 #endif /* !(__SPARC_SYSTEM_H) */
344
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