blob: 100c3eaf3c1fe439713ccedab0ea8c0e87459067 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* $Id: system.h,v 1.86 2001/10/30 04:57:10 davem Exp $ */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002
3#ifndef __SPARC_SYSTEM_H
4#define __SPARC_SYSTEM_H
5
Linus Torvalds1da177e2005-04-16 15:20:36 -07006#include <linux/kernel.h>
7#include <linux/threads.h> /* NR_CPUS */
8#include <linux/thread_info.h>
9
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <asm/page.h>
11#include <asm/psr.h>
12#include <asm/ptrace.h>
13#include <asm/btfixup.h>
14
15#ifndef __ASSEMBLY__
16
17/*
18 * Sparc (general) CPU types
19 */
20enum sparc_cpu {
21 sun4 = 0x00,
22 sun4c = 0x01,
23 sun4m = 0x02,
24 sun4d = 0x03,
25 sun4e = 0x04,
26 sun4u = 0x05, /* V8 ploos ploos */
27 sun_unknown = 0x06,
28 ap1000 = 0x07, /* almost a sun4m */
29};
30
31/* Really, userland should not be looking at any of this... */
32#ifdef __KERNEL__
33
34extern enum sparc_cpu sparc_cpu_model;
35
36#ifndef CONFIG_SUN4
37#define ARCH_SUN4C_SUN4 (sparc_cpu_model==sun4c)
38#define ARCH_SUN4 0
39#else
40#define ARCH_SUN4C_SUN4 1
41#define ARCH_SUN4 1
42#endif
43
44#define SUN4M_NCPUS 4 /* Architectural limit of sun4m. */
45
46extern struct thread_info *current_set[NR_CPUS];
47
48extern unsigned long empty_bad_page;
49extern unsigned long empty_bad_page_table;
50extern unsigned long empty_zero_page;
51
52extern void sun_do_break(void);
53extern int serial_console;
54extern int stop_a_enabled;
55
56static __inline__ int con_is_present(void)
57{
58 return serial_console ? 0 : 1;
59}
60
61/* When a context switch happens we must flush all user windows so that
62 * the windows of the current process are flushed onto its stack. This
63 * way the windows are all clean for the next process and the stack
64 * frames are up to date.
65 */
66extern void flush_user_windows(void);
67extern void kill_user_windows(void);
68extern void synchronize_user_stack(void);
69extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
70 void *fpqueue, unsigned long *fpqdepth);
71
72#ifdef CONFIG_SMP
73#define SWITCH_ENTER(prv) \
74 do { \
75 if (test_tsk_thread_flag(prv, TIF_USEDFPU)) { \
76 put_psr(get_psr() | PSR_EF); \
77 fpsave(&(prv)->thread.float_regs[0], &(prv)->thread.fsr, \
78 &(prv)->thread.fpqueue[0], &(prv)->thread.fpqdepth); \
79 clear_tsk_thread_flag(prv, TIF_USEDFPU); \
80 (prv)->thread.kregs->psr &= ~PSR_EF; \
81 } \
82 } while(0)
83
84#define SWITCH_DO_LAZY_FPU(next) /* */
85#else
86#define SWITCH_ENTER(prv) /* */
87#define SWITCH_DO_LAZY_FPU(nxt) \
88 do { \
89 if (last_task_used_math != (nxt)) \
90 (nxt)->thread.kregs->psr&=~PSR_EF; \
91 } while(0)
92#endif
93
94/*
95 * Flush windows so that the VM switch which follows
96 * would not pull the stack from under us.
97 *
98 * SWITCH_ENTER and SWITH_DO_LAZY_FPU do not work yet (e.g. SMP does not work)
99 * XXX WTF is the above comment? Found in late teen 2.4.x.
100 */
Nick Piggin4866cde2005-06-25 14:57:23 -0700101#define prepare_arch_switch(next) do { \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 __asm__ __volatile__( \
103 ".globl\tflush_patch_switch\nflush_patch_switch:\n\t" \
104 "save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \
105 "save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \
106 "save %sp, -0x40, %sp\n\t" \
107 "restore; restore; restore; restore; restore; restore; restore"); \
108} while(0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
110 /* Much care has gone into this code, do not touch it.
111 *
112 * We need to loadup regs l0/l1 for the newly forked child
113 * case because the trap return path relies on those registers
114 * holding certain values, gcc is told that they are clobbered.
115 * Gcc needs registers for 3 values in and 1 value out, so we
116 * clobber every non-fixed-usage register besides l2/l3/o4/o5. -DaveM
117 *
118 * Hey Dave, that do not touch sign is too much of an incentive
119 * - Anton & Pete
120 */
121#define switch_to(prev, next, last) do { \
122 SWITCH_ENTER(prev); \
123 SWITCH_DO_LAZY_FPU(next); \
124 cpu_set(smp_processor_id(), next->active_mm->cpu_vm_mask); \
125 __asm__ __volatile__( \
126 "sethi %%hi(here - 0x8), %%o7\n\t" \
127 "mov %%g6, %%g3\n\t" \
128 "or %%o7, %%lo(here - 0x8), %%o7\n\t" \
129 "rd %%psr, %%g4\n\t" \
130 "std %%sp, [%%g6 + %4]\n\t" \
131 "rd %%wim, %%g5\n\t" \
132 "wr %%g4, 0x20, %%psr\n\t" \
133 "nop\n\t" \
134 "std %%g4, [%%g6 + %3]\n\t" \
135 "ldd [%2 + %3], %%g4\n\t" \
136 "mov %2, %%g6\n\t" \
137 ".globl patchme_store_new_current\n" \
138"patchme_store_new_current:\n\t" \
139 "st %2, [%1]\n\t" \
140 "wr %%g4, 0x20, %%psr\n\t" \
141 "nop\n\t" \
142 "nop\n\t" \
143 "nop\n\t" /* LEON needs all 3 nops: load to %sp depends on CWP. */ \
144 "ldd [%%g6 + %4], %%sp\n\t" \
145 "wr %%g5, 0x0, %%wim\n\t" \
146 "ldd [%%sp + 0x00], %%l0\n\t" \
147 "ldd [%%sp + 0x38], %%i6\n\t" \
148 "wr %%g4, 0x0, %%psr\n\t" \
149 "nop\n\t" \
150 "nop\n\t" \
151 "jmpl %%o7 + 0x8, %%g0\n\t" \
152 " ld [%%g3 + %5], %0\n\t" \
153 "here:\n" \
154 : "=&r" (last) \
155 : "r" (&(current_set[hard_smp_processor_id()])), \
Al Virod562ef62006-01-12 01:05:46 -0800156 "r" (task_thread_info(next)), \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 "i" (TI_KPSR), \
158 "i" (TI_KSP), \
159 "i" (TI_TASK) \
160 : "g1", "g2", "g3", "g4", "g5", "g7", \
161 "l0", "l1", "l3", "l4", "l5", "l6", "l7", \
162 "i0", "i1", "i2", "i3", "i4", "i5", \
163 "o0", "o1", "o2", "o3", "o7"); \
164 } while(0)
165
166/*
Ingo Molnar4dc7a0b2006-01-12 01:05:27 -0800167 * On SMP systems, when the scheduler does migration-cost autodetection,
168 * it needs a way to flush as much of the CPU's caches as possible.
169 *
170 * TODO: fill this in!
171 */
172static inline void sched_cacheflush(void)
173{
174}
175
176/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 * Changing the IRQ level on the Sparc.
178 */
179extern void local_irq_restore(unsigned long);
180extern unsigned long __local_irq_save(void);
181extern void local_irq_enable(void);
182
183static inline unsigned long getipl(void)
184{
185 unsigned long retval;
186
187 __asm__ __volatile__("rd %%psr, %0" : "=r" (retval));
188 return retval;
189}
190
191#define local_save_flags(flags) ((flags) = getipl())
192#define local_irq_save(flags) ((flags) = __local_irq_save())
193#define local_irq_disable() ((void) __local_irq_save())
194#define irqs_disabled() ((getipl() & PSR_PIL) != 0)
195
196/* XXX Change this if we ever use a PSO mode kernel. */
197#define mb() __asm__ __volatile__ ("" : : : "memory")
198#define rmb() mb()
199#define wmb() mb()
200#define read_barrier_depends() do { } while(0)
201#define set_mb(__var, __value) do { __var = __value; mb(); } while(0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202#define smp_mb() __asm__ __volatile__("":::"memory")
203#define smp_rmb() __asm__ __volatile__("":::"memory")
204#define smp_wmb() __asm__ __volatile__("":::"memory")
205#define smp_read_barrier_depends() do { } while(0)
206
207#define nop() __asm__ __volatile__ ("nop")
208
209/* This has special calling conventions */
210#ifndef CONFIG_SMP
211BTFIXUPDEF_CALL(void, ___xchg32, void)
212#endif
213
Adrian Bunk31156242005-10-03 17:37:02 -0700214static inline unsigned long xchg_u32(__volatile__ unsigned long *m, unsigned long val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215{
216#ifdef CONFIG_SMP
217 __asm__ __volatile__("swap [%2], %0"
218 : "=&r" (val)
219 : "0" (val), "r" (m)
220 : "memory");
221 return val;
222#else
223 register unsigned long *ptr asm("g1");
224 register unsigned long ret asm("g2");
225
226 ptr = (unsigned long *) m;
227 ret = val;
228
229 /* Note: this is magic and the nop there is
230 really needed. */
231 __asm__ __volatile__(
232 "mov %%o7, %%g4\n\t"
233 "call ___f____xchg32\n\t"
234 " nop\n\t"
235 : "=&r" (ret)
236 : "0" (ret), "r" (ptr)
237 : "g3", "g4", "g7", "memory", "cc");
238
239 return ret;
240#endif
241}
242
243#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
244#define tas(ptr) (xchg((ptr),1))
245
246extern void __xchg_called_with_bad_pointer(void);
247
248static __inline__ unsigned long __xchg(unsigned long x, __volatile__ void * ptr, int size)
249{
250 switch (size) {
251 case 4:
252 return xchg_u32(ptr, x);
253 };
254 __xchg_called_with_bad_pointer();
255 return x;
256}
257
258extern void die_if_kernel(char *str, struct pt_regs *regs) __attribute__ ((noreturn));
259
260#endif /* __KERNEL__ */
261
262#endif /* __ASSEMBLY__ */
263
264#define arch_align_stack(x) (x)
265
266#endif /* !(__SPARC_SYSTEM_H) */