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1da177e4 | 1 | /* $Id: system.h,v 1.86 2001/10/30 04:57:10 davem Exp $ */ |
1da177e4 LT |
2 | |
3 | #ifndef __SPARC_SYSTEM_H | |
4 | #define __SPARC_SYSTEM_H | |
5 | ||
1da177e4 LT |
6 | #include <linux/kernel.h> |
7 | #include <linux/threads.h> /* NR_CPUS */ | |
8 | #include <linux/thread_info.h> | |
9 | ||
1da177e4 LT |
10 | #include <asm/page.h> |
11 | #include <asm/psr.h> | |
12 | #include <asm/ptrace.h> | |
13 | #include <asm/btfixup.h> | |
6e46507d | 14 | #include <asm/smp.h> |
1da177e4 LT |
15 | |
16 | #ifndef __ASSEMBLY__ | |
17 | ||
e8dd1612 RR |
18 | #include <linux/irqflags.h> |
19 | ||
1da177e4 LT |
20 | /* |
21 | * Sparc (general) CPU types | |
22 | */ | |
23 | enum sparc_cpu { | |
24 | sun4 = 0x00, | |
25 | sun4c = 0x01, | |
26 | sun4m = 0x02, | |
27 | sun4d = 0x03, | |
28 | sun4e = 0x04, | |
29 | sun4u = 0x05, /* V8 ploos ploos */ | |
30 | sun_unknown = 0x06, | |
31 | ap1000 = 0x07, /* almost a sun4m */ | |
32 | }; | |
33 | ||
34 | /* Really, userland should not be looking at any of this... */ | |
35 | #ifdef __KERNEL__ | |
36 | ||
37 | extern enum sparc_cpu sparc_cpu_model; | |
38 | ||
39 | #ifndef CONFIG_SUN4 | |
40 | #define ARCH_SUN4C_SUN4 (sparc_cpu_model==sun4c) | |
41 | #define ARCH_SUN4 0 | |
42 | #else | |
43 | #define ARCH_SUN4C_SUN4 1 | |
44 | #define ARCH_SUN4 1 | |
45 | #endif | |
46 | ||
47 | #define SUN4M_NCPUS 4 /* Architectural limit of sun4m. */ | |
48 | ||
49 | extern struct thread_info *current_set[NR_CPUS]; | |
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 void sun_do_break(void); | |
56 | extern int serial_console; | |
57 | extern int stop_a_enabled; | |
58 | ||
59 | static __inline__ int con_is_present(void) | |
60 | { | |
61 | return serial_console ? 0 : 1; | |
62 | } | |
63 | ||
64 | /* When a context switch happens we must flush all user windows so that | |
65 | * the windows of the current process are flushed onto its stack. This | |
66 | * way the windows are all clean for the next process and the stack | |
67 | * frames are up to date. | |
68 | */ | |
69 | extern void flush_user_windows(void); | |
70 | extern void kill_user_windows(void); | |
71 | extern void synchronize_user_stack(void); | |
72 | extern void fpsave(unsigned long *fpregs, unsigned long *fsr, | |
73 | void *fpqueue, unsigned long *fpqdepth); | |
74 | ||
75 | #ifdef CONFIG_SMP | |
76 | #define SWITCH_ENTER(prv) \ | |
77 | do { \ | |
78 | if (test_tsk_thread_flag(prv, TIF_USEDFPU)) { \ | |
79 | put_psr(get_psr() | PSR_EF); \ | |
80 | fpsave(&(prv)->thread.float_regs[0], &(prv)->thread.fsr, \ | |
81 | &(prv)->thread.fpqueue[0], &(prv)->thread.fpqdepth); \ | |
82 | clear_tsk_thread_flag(prv, TIF_USEDFPU); \ | |
83 | (prv)->thread.kregs->psr &= ~PSR_EF; \ | |
84 | } \ | |
85 | } while(0) | |
86 | ||
87 | #define SWITCH_DO_LAZY_FPU(next) /* */ | |
88 | #else | |
89 | #define SWITCH_ENTER(prv) /* */ | |
90 | #define SWITCH_DO_LAZY_FPU(nxt) \ | |
91 | do { \ | |
92 | if (last_task_used_math != (nxt)) \ | |
93 | (nxt)->thread.kregs->psr&=~PSR_EF; \ | |
94 | } while(0) | |
95 | #endif | |
96 | ||
97 | /* | |
98 | * Flush windows so that the VM switch which follows | |
99 | * would not pull the stack from under us. | |
100 | * | |
101 | * SWITCH_ENTER and SWITH_DO_LAZY_FPU do not work yet (e.g. SMP does not work) | |
102 | * XXX WTF is the above comment? Found in late teen 2.4.x. | |
103 | */ | |
4866cde0 | 104 | #define prepare_arch_switch(next) do { \ |
1da177e4 LT |
105 | __asm__ __volatile__( \ |
106 | ".globl\tflush_patch_switch\nflush_patch_switch:\n\t" \ | |
107 | "save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \ | |
108 | "save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \ | |
109 | "save %sp, -0x40, %sp\n\t" \ | |
110 | "restore; restore; restore; restore; restore; restore; restore"); \ | |
111 | } while(0) | |
1da177e4 LT |
112 | |
113 | /* Much care has gone into this code, do not touch it. | |
114 | * | |
115 | * We need to loadup regs l0/l1 for the newly forked child | |
116 | * case because the trap return path relies on those registers | |
117 | * holding certain values, gcc is told that they are clobbered. | |
118 | * Gcc needs registers for 3 values in and 1 value out, so we | |
119 | * clobber every non-fixed-usage register besides l2/l3/o4/o5. -DaveM | |
120 | * | |
121 | * Hey Dave, that do not touch sign is too much of an incentive | |
122 | * - Anton & Pete | |
123 | */ | |
124 | #define switch_to(prev, next, last) do { \ | |
125 | SWITCH_ENTER(prev); \ | |
126 | SWITCH_DO_LAZY_FPU(next); \ | |
127 | cpu_set(smp_processor_id(), next->active_mm->cpu_vm_mask); \ | |
128 | __asm__ __volatile__( \ | |
129 | "sethi %%hi(here - 0x8), %%o7\n\t" \ | |
130 | "mov %%g6, %%g3\n\t" \ | |
131 | "or %%o7, %%lo(here - 0x8), %%o7\n\t" \ | |
132 | "rd %%psr, %%g4\n\t" \ | |
133 | "std %%sp, [%%g6 + %4]\n\t" \ | |
134 | "rd %%wim, %%g5\n\t" \ | |
135 | "wr %%g4, 0x20, %%psr\n\t" \ | |
136 | "nop\n\t" \ | |
137 | "std %%g4, [%%g6 + %3]\n\t" \ | |
138 | "ldd [%2 + %3], %%g4\n\t" \ | |
139 | "mov %2, %%g6\n\t" \ | |
140 | ".globl patchme_store_new_current\n" \ | |
141 | "patchme_store_new_current:\n\t" \ | |
142 | "st %2, [%1]\n\t" \ | |
143 | "wr %%g4, 0x20, %%psr\n\t" \ | |
144 | "nop\n\t" \ | |
145 | "nop\n\t" \ | |
146 | "nop\n\t" /* LEON needs all 3 nops: load to %sp depends on CWP. */ \ | |
147 | "ldd [%%g6 + %4], %%sp\n\t" \ | |
148 | "wr %%g5, 0x0, %%wim\n\t" \ | |
149 | "ldd [%%sp + 0x00], %%l0\n\t" \ | |
150 | "ldd [%%sp + 0x38], %%i6\n\t" \ | |
151 | "wr %%g4, 0x0, %%psr\n\t" \ | |
152 | "nop\n\t" \ | |
153 | "nop\n\t" \ | |
154 | "jmpl %%o7 + 0x8, %%g0\n\t" \ | |
155 | " ld [%%g3 + %5], %0\n\t" \ | |
156 | "here:\n" \ | |
157 | : "=&r" (last) \ | |
158 | : "r" (&(current_set[hard_smp_processor_id()])), \ | |
d562ef6a | 159 | "r" (task_thread_info(next)), \ |
1da177e4 LT |
160 | "i" (TI_KPSR), \ |
161 | "i" (TI_KSP), \ | |
162 | "i" (TI_TASK) \ | |
163 | : "g1", "g2", "g3", "g4", "g5", "g7", \ | |
164 | "l0", "l1", "l3", "l4", "l5", "l6", "l7", \ | |
165 | "i0", "i1", "i2", "i3", "i4", "i5", \ | |
166 | "o0", "o1", "o2", "o3", "o7"); \ | |
167 | } while(0) | |
168 | ||
1da177e4 LT |
169 | /* XXX Change this if we ever use a PSO mode kernel. */ |
170 | #define mb() __asm__ __volatile__ ("" : : : "memory") | |
171 | #define rmb() mb() | |
172 | #define wmb() mb() | |
173 | #define read_barrier_depends() do { } while(0) | |
174 | #define set_mb(__var, __value) do { __var = __value; mb(); } while(0) | |
1da177e4 LT |
175 | #define smp_mb() __asm__ __volatile__("":::"memory") |
176 | #define smp_rmb() __asm__ __volatile__("":::"memory") | |
177 | #define smp_wmb() __asm__ __volatile__("":::"memory") | |
178 | #define smp_read_barrier_depends() do { } while(0) | |
179 | ||
180 | #define nop() __asm__ __volatile__ ("nop") | |
181 | ||
182 | /* This has special calling conventions */ | |
183 | #ifndef CONFIG_SMP | |
184 | BTFIXUPDEF_CALL(void, ___xchg32, void) | |
185 | #endif | |
186 | ||
3115624e | 187 | static inline unsigned long xchg_u32(__volatile__ unsigned long *m, unsigned long val) |
1da177e4 LT |
188 | { |
189 | #ifdef CONFIG_SMP | |
190 | __asm__ __volatile__("swap [%2], %0" | |
191 | : "=&r" (val) | |
192 | : "0" (val), "r" (m) | |
193 | : "memory"); | |
194 | return val; | |
195 | #else | |
196 | register unsigned long *ptr asm("g1"); | |
197 | register unsigned long ret asm("g2"); | |
198 | ||
199 | ptr = (unsigned long *) m; | |
200 | ret = val; | |
201 | ||
202 | /* Note: this is magic and the nop there is | |
203 | really needed. */ | |
204 | __asm__ __volatile__( | |
205 | "mov %%o7, %%g4\n\t" | |
206 | "call ___f____xchg32\n\t" | |
207 | " nop\n\t" | |
208 | : "=&r" (ret) | |
209 | : "0" (ret), "r" (ptr) | |
210 | : "g3", "g4", "g7", "memory", "cc"); | |
211 | ||
212 | return ret; | |
213 | #endif | |
214 | } | |
215 | ||
216 | #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) | |
1da177e4 LT |
217 | |
218 | extern void __xchg_called_with_bad_pointer(void); | |
219 | ||
220 | static __inline__ unsigned long __xchg(unsigned long x, __volatile__ void * ptr, int size) | |
221 | { | |
222 | switch (size) { | |
223 | case 4: | |
224 | return xchg_u32(ptr, x); | |
225 | }; | |
226 | __xchg_called_with_bad_pointer(); | |
227 | return x; | |
228 | } | |
229 | ||
230 | extern void die_if_kernel(char *str, struct pt_regs *regs) __attribute__ ((noreturn)); | |
231 | ||
232 | #endif /* __KERNEL__ */ | |
233 | ||
234 | #endif /* __ASSEMBLY__ */ | |
235 | ||
236 | #define arch_align_stack(x) (x) | |
237 | ||
238 | #endif /* !(__SPARC_SYSTEM_H) */ |