Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef __ALPHA_SYSTEM_H
2#define __ALPHA_SYSTEM_H
3
4#include <linux/config.h>
5#include <asm/pal.h>
6#include <asm/page.h>
7#include <asm/barrier.h>
8
9/*
10 * System defines.. Note that this is included both from .c and .S
11 * files, so it does only defines, not any C code.
12 */
13
14/*
15 * We leave one page for the initial stack page, and one page for
16 * the initial process structure. Also, the console eats 3 MB for
17 * the initial bootloader (one of which we can reclaim later).
18 */
19#define BOOT_PCB 0x20000000
20#define BOOT_ADDR 0x20000000
21/* Remove when official MILO sources have ELF support: */
22#define BOOT_SIZE (16*1024)
23
24#ifdef CONFIG_ALPHA_LEGACY_START_ADDRESS
25#define KERNEL_START_PHYS 0x300000 /* Old bootloaders hardcoded this. */
26#else
27#define KERNEL_START_PHYS 0x1000000 /* required: Wildfire/Titan/Marvel */
28#endif
29
30#define KERNEL_START (PAGE_OFFSET+KERNEL_START_PHYS)
31#define SWAPPER_PGD KERNEL_START
32#define INIT_STACK (PAGE_OFFSET+KERNEL_START_PHYS+0x02000)
33#define EMPTY_PGT (PAGE_OFFSET+KERNEL_START_PHYS+0x04000)
34#define EMPTY_PGE (PAGE_OFFSET+KERNEL_START_PHYS+0x08000)
35#define ZERO_PGE (PAGE_OFFSET+KERNEL_START_PHYS+0x0A000)
36
37#define START_ADDR (PAGE_OFFSET+KERNEL_START_PHYS+0x10000)
38
39/*
40 * This is setup by the secondary bootstrap loader. Because
41 * the zero page is zeroed out as soon as the vm system is
42 * initialized, we need to copy things out into a more permanent
43 * place.
44 */
45#define PARAM ZERO_PGE
46#define COMMAND_LINE ((char*)(PARAM + 0x0000))
47#define INITRD_START (*(unsigned long *) (PARAM+0x100))
48#define INITRD_SIZE (*(unsigned long *) (PARAM+0x108))
49
50#ifndef __ASSEMBLY__
51#include <linux/kernel.h>
52
53/*
54 * This is the logout header that should be common to all platforms
55 * (assuming they are running OSF/1 PALcode, I guess).
56 */
57struct el_common {
58 unsigned int size; /* size in bytes of logout area */
59 unsigned int sbz1 : 30; /* should be zero */
60 unsigned int err2 : 1; /* second error */
61 unsigned int retry : 1; /* retry flag */
62 unsigned int proc_offset; /* processor-specific offset */
63 unsigned int sys_offset; /* system-specific offset */
64 unsigned int code; /* machine check code */
65 unsigned int frame_rev; /* frame revision */
66};
67
68/* Machine Check Frame for uncorrectable errors (Large format)
69 * --- This is used to log uncorrectable errors such as
70 * double bit ECC errors.
71 * --- These errors are detected by both processor and systems.
72 */
73struct el_common_EV5_uncorrectable_mcheck {
74 unsigned long shadow[8]; /* Shadow reg. 8-14, 25 */
75 unsigned long paltemp[24]; /* PAL TEMP REGS. */
76 unsigned long exc_addr; /* Address of excepting instruction*/
77 unsigned long exc_sum; /* Summary of arithmetic traps. */
78 unsigned long exc_mask; /* Exception mask (from exc_sum). */
79 unsigned long pal_base; /* Base address for PALcode. */
80 unsigned long isr; /* Interrupt Status Reg. */
81 unsigned long icsr; /* CURRENT SETUP OF EV5 IBOX */
82 unsigned long ic_perr_stat; /* I-CACHE Reg. <11> set Data parity
83 <12> set TAG parity*/
84 unsigned long dc_perr_stat; /* D-CACHE error Reg. Bits set to 1:
85 <2> Data error in bank 0
86 <3> Data error in bank 1
87 <4> Tag error in bank 0
88 <5> Tag error in bank 1 */
89 unsigned long va; /* Effective VA of fault or miss. */
90 unsigned long mm_stat; /* Holds the reason for D-stream
91 fault or D-cache parity errors */
92 unsigned long sc_addr; /* Address that was being accessed
93 when EV5 detected Secondary cache
94 failure. */
95 unsigned long sc_stat; /* Helps determine if the error was
96 TAG/Data parity(Secondary Cache)*/
97 unsigned long bc_tag_addr; /* Contents of EV5 BC_TAG_ADDR */
98 unsigned long ei_addr; /* Physical address of any transfer
99 that is logged in EV5 EI_STAT */
100 unsigned long fill_syndrome; /* For correcting ECC errors. */
101 unsigned long ei_stat; /* Helps identify reason of any
102 processor uncorrectable error
103 at its external interface. */
104 unsigned long ld_lock; /* Contents of EV5 LD_LOCK register*/
105};
106
107struct el_common_EV6_mcheck {
108 unsigned int FrameSize; /* Bytes, including this field */
109 unsigned int FrameFlags; /* <31> = Retry, <30> = Second Error */
110 unsigned int CpuOffset; /* Offset to CPU-specific info */
111 unsigned int SystemOffset; /* Offset to system-specific info */
112 unsigned int MCHK_Code;
113 unsigned int MCHK_Frame_Rev;
114 unsigned long I_STAT; /* EV6 Internal Processor Registers */
115 unsigned long DC_STAT; /* (See the 21264 Spec) */
116 unsigned long C_ADDR;
117 unsigned long DC1_SYNDROME;
118 unsigned long DC0_SYNDROME;
119 unsigned long C_STAT;
120 unsigned long C_STS;
121 unsigned long MM_STAT;
122 unsigned long EXC_ADDR;
123 unsigned long IER_CM;
124 unsigned long ISUM;
125 unsigned long RESERVED0;
126 unsigned long PAL_BASE;
127 unsigned long I_CTL;
128 unsigned long PCTX;
129};
130
131extern void halt(void) __attribute__((noreturn));
132#define __halt() __asm__ __volatile__ ("call_pal %0 #halt" : : "i" (PAL_halt))
133
134#define switch_to(P,N,L) \
135 do { \
136 (L) = alpha_switch_to(virt_to_phys(&(N)->thread_info->pcb), (P)); \
137 check_mmu_context(); \
138 } while (0)
139
140struct task_struct;
141extern struct task_struct *alpha_switch_to(unsigned long, struct task_struct*);
142
143#define imb() \
144__asm__ __volatile__ ("call_pal %0 #imb" : : "i" (PAL_imb) : "memory")
145
146#define draina() \
147__asm__ __volatile__ ("call_pal %0 #draina" : : "i" (PAL_draina) : "memory")
148
149enum implver_enum {
150 IMPLVER_EV4,
151 IMPLVER_EV5,
152 IMPLVER_EV6
153};
154
155#ifdef CONFIG_ALPHA_GENERIC
156#define implver() \
157({ unsigned long __implver; \
158 __asm__ ("implver %0" : "=r"(__implver)); \
159 (enum implver_enum) __implver; })
160#else
161/* Try to eliminate some dead code. */
162#ifdef CONFIG_ALPHA_EV4
163#define implver() IMPLVER_EV4
164#endif
165#ifdef CONFIG_ALPHA_EV5
166#define implver() IMPLVER_EV5
167#endif
168#if defined(CONFIG_ALPHA_EV6)
169#define implver() IMPLVER_EV6
170#endif
171#endif
172
173enum amask_enum {
174 AMASK_BWX = (1UL << 0),
175 AMASK_FIX = (1UL << 1),
176 AMASK_CIX = (1UL << 2),
177 AMASK_MAX = (1UL << 8),
178 AMASK_PRECISE_TRAP = (1UL << 9),
179};
180
181#define amask(mask) \
182({ unsigned long __amask, __input = (mask); \
183 __asm__ ("amask %1,%0" : "=r"(__amask) : "rI"(__input)); \
184 __amask; })
185
186#define __CALL_PAL_R0(NAME, TYPE) \
187static inline TYPE NAME(void) \
188{ \
189 register TYPE __r0 __asm__("$0"); \
190 __asm__ __volatile__( \
191 "call_pal %1 # " #NAME \
192 :"=r" (__r0) \
193 :"i" (PAL_ ## NAME) \
194 :"$1", "$16", "$22", "$23", "$24", "$25"); \
195 return __r0; \
196}
197
198#define __CALL_PAL_W1(NAME, TYPE0) \
199static inline void NAME(TYPE0 arg0) \
200{ \
201 register TYPE0 __r16 __asm__("$16") = arg0; \
202 __asm__ __volatile__( \
203 "call_pal %1 # "#NAME \
204 : "=r"(__r16) \
205 : "i"(PAL_ ## NAME), "0"(__r16) \
206 : "$1", "$22", "$23", "$24", "$25"); \
207}
208
209#define __CALL_PAL_W2(NAME, TYPE0, TYPE1) \
210static inline void NAME(TYPE0 arg0, TYPE1 arg1) \
211{ \
212 register TYPE0 __r16 __asm__("$16") = arg0; \
213 register TYPE1 __r17 __asm__("$17") = arg1; \
214 __asm__ __volatile__( \
215 "call_pal %2 # "#NAME \
216 : "=r"(__r16), "=r"(__r17) \
217 : "i"(PAL_ ## NAME), "0"(__r16), "1"(__r17) \
218 : "$1", "$22", "$23", "$24", "$25"); \
219}
220
221#define __CALL_PAL_RW1(NAME, RTYPE, TYPE0) \
222static inline RTYPE NAME(TYPE0 arg0) \
223{ \
224 register RTYPE __r0 __asm__("$0"); \
225 register TYPE0 __r16 __asm__("$16") = arg0; \
226 __asm__ __volatile__( \
227 "call_pal %2 # "#NAME \
228 : "=r"(__r16), "=r"(__r0) \
229 : "i"(PAL_ ## NAME), "0"(__r16) \
230 : "$1", "$22", "$23", "$24", "$25"); \
231 return __r0; \
232}
233
234#define __CALL_PAL_RW2(NAME, RTYPE, TYPE0, TYPE1) \
235static inline RTYPE NAME(TYPE0 arg0, TYPE1 arg1) \
236{ \
237 register RTYPE __r0 __asm__("$0"); \
238 register TYPE0 __r16 __asm__("$16") = arg0; \
239 register TYPE1 __r17 __asm__("$17") = arg1; \
240 __asm__ __volatile__( \
241 "call_pal %3 # "#NAME \
242 : "=r"(__r16), "=r"(__r17), "=r"(__r0) \
243 : "i"(PAL_ ## NAME), "0"(__r16), "1"(__r17) \
244 : "$1", "$22", "$23", "$24", "$25"); \
245 return __r0; \
246}
247
248__CALL_PAL_W1(cflush, unsigned long);
249__CALL_PAL_R0(rdmces, unsigned long);
250__CALL_PAL_R0(rdps, unsigned long);
251__CALL_PAL_R0(rdusp, unsigned long);
252__CALL_PAL_RW1(swpipl, unsigned long, unsigned long);
253__CALL_PAL_R0(whami, unsigned long);
254__CALL_PAL_W2(wrent, void*, unsigned long);
255__CALL_PAL_W1(wripir, unsigned long);
256__CALL_PAL_W1(wrkgp, unsigned long);
257__CALL_PAL_W1(wrmces, unsigned long);
258__CALL_PAL_RW2(wrperfmon, unsigned long, unsigned long, unsigned long);
259__CALL_PAL_W1(wrusp, unsigned long);
260__CALL_PAL_W1(wrvptptr, unsigned long);
261
262#define IPL_MIN 0
263#define IPL_SW0 1
264#define IPL_SW1 2
265#define IPL_DEV0 3
266#define IPL_DEV1 4
267#define IPL_TIMER 5
268#define IPL_PERF 6
269#define IPL_POWERFAIL 6
270#define IPL_MCHECK 7
271#define IPL_MAX 7
272
273#ifdef CONFIG_ALPHA_BROKEN_IRQ_MASK
274#undef IPL_MIN
275#define IPL_MIN __min_ipl
276extern int __min_ipl;
277#endif
278
279#define getipl() (rdps() & 7)
280#define setipl(ipl) ((void) swpipl(ipl))
281
282#define local_irq_disable() do { setipl(IPL_MAX); barrier(); } while(0)
283#define local_irq_enable() do { barrier(); setipl(IPL_MIN); } while(0)
284#define local_save_flags(flags) ((flags) = rdps())
285#define local_irq_save(flags) do { (flags) = swpipl(IPL_MAX); barrier(); } while(0)
286#define local_irq_restore(flags) do { barrier(); setipl(flags); barrier(); } while(0)
287
288#define irqs_disabled() (getipl() == IPL_MAX)
289
290/*
291 * TB routines..
292 */
293#define __tbi(nr,arg,arg1...) \
294({ \
295 register unsigned long __r16 __asm__("$16") = (nr); \
296 register unsigned long __r17 __asm__("$17"); arg; \
297 __asm__ __volatile__( \
298 "call_pal %3 #__tbi" \
299 :"=r" (__r16),"=r" (__r17) \
300 :"0" (__r16),"i" (PAL_tbi) ,##arg1 \
301 :"$0", "$1", "$22", "$23", "$24", "$25"); \
302})
303
304#define tbi(x,y) __tbi(x,__r17=(y),"1" (__r17))
305#define tbisi(x) __tbi(1,__r17=(x),"1" (__r17))
306#define tbisd(x) __tbi(2,__r17=(x),"1" (__r17))
307#define tbis(x) __tbi(3,__r17=(x),"1" (__r17))
308#define tbiap() __tbi(-1, /* no second argument */)
309#define tbia() __tbi(-2, /* no second argument */)
310
311/*
312 * Atomic exchange.
313 * Since it can be used to implement critical sections
314 * it must clobber "memory" (also for interrupts in UP).
315 */
316
317static inline unsigned long
318__xchg_u8(volatile char *m, unsigned long val)
319{
320 unsigned long ret, tmp, addr64;
321
322 __asm__ __volatile__(
323 " andnot %4,7,%3\n"
324 " insbl %1,%4,%1\n"
325 "1: ldq_l %2,0(%3)\n"
326 " extbl %2,%4,%0\n"
327 " mskbl %2,%4,%2\n"
328 " or %1,%2,%2\n"
329 " stq_c %2,0(%3)\n"
330 " beq %2,2f\n"
331#ifdef CONFIG_SMP
332 " mb\n"
333#endif
334 ".subsection 2\n"
335 "2: br 1b\n"
336 ".previous"
337 : "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64)
338 : "r" ((long)m), "1" (val) : "memory");
339
340 return ret;
341}
342
343static inline unsigned long
344__xchg_u16(volatile short *m, unsigned long val)
345{
346 unsigned long ret, tmp, addr64;
347
348 __asm__ __volatile__(
349 " andnot %4,7,%3\n"
350 " inswl %1,%4,%1\n"
351 "1: ldq_l %2,0(%3)\n"
352 " extwl %2,%4,%0\n"
353 " mskwl %2,%4,%2\n"
354 " or %1,%2,%2\n"
355 " stq_c %2,0(%3)\n"
356 " beq %2,2f\n"
357#ifdef CONFIG_SMP
358 " mb\n"
359#endif
360 ".subsection 2\n"
361 "2: br 1b\n"
362 ".previous"
363 : "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64)
364 : "r" ((long)m), "1" (val) : "memory");
365
366 return ret;
367}
368
369static inline unsigned long
370__xchg_u32(volatile int *m, unsigned long val)
371{
372 unsigned long dummy;
373
374 __asm__ __volatile__(
375 "1: ldl_l %0,%4\n"
376 " bis $31,%3,%1\n"
377 " stl_c %1,%2\n"
378 " beq %1,2f\n"
379#ifdef CONFIG_SMP
380 " mb\n"
381#endif
382 ".subsection 2\n"
383 "2: br 1b\n"
384 ".previous"
385 : "=&r" (val), "=&r" (dummy), "=m" (*m)
386 : "rI" (val), "m" (*m) : "memory");
387
388 return val;
389}
390
391static inline unsigned long
392__xchg_u64(volatile long *m, unsigned long val)
393{
394 unsigned long dummy;
395
396 __asm__ __volatile__(
397 "1: ldq_l %0,%4\n"
398 " bis $31,%3,%1\n"
399 " stq_c %1,%2\n"
400 " beq %1,2f\n"
401#ifdef CONFIG_SMP
402 " mb\n"
403#endif
404 ".subsection 2\n"
405 "2: br 1b\n"
406 ".previous"
407 : "=&r" (val), "=&r" (dummy), "=m" (*m)
408 : "rI" (val), "m" (*m) : "memory");
409
410 return val;
411}
412
413/* This function doesn't exist, so you'll get a linker error
414 if something tries to do an invalid xchg(). */
415extern void __xchg_called_with_bad_pointer(void);
416
417#define __xchg(ptr, x, size) \
418({ \
419 unsigned long __xchg__res; \
420 volatile void *__xchg__ptr = (ptr); \
421 switch (size) { \
422 case 1: __xchg__res = __xchg_u8(__xchg__ptr, x); break; \
423 case 2: __xchg__res = __xchg_u16(__xchg__ptr, x); break; \
424 case 4: __xchg__res = __xchg_u32(__xchg__ptr, x); break; \
425 case 8: __xchg__res = __xchg_u64(__xchg__ptr, x); break; \
426 default: __xchg_called_with_bad_pointer(); __xchg__res = x; \
427 } \
428 __xchg__res; \
429})
430
431#define xchg(ptr,x) \
432 ({ \
433 __typeof__(*(ptr)) _x_ = (x); \
434 (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \
435 })
436
437#define tas(ptr) (xchg((ptr),1))
438
439
440/*
441 * Atomic compare and exchange. Compare OLD with MEM, if identical,
442 * store NEW in MEM. Return the initial value in MEM. Success is
443 * indicated by comparing RETURN with OLD.
444 *
445 * The memory barrier should be placed in SMP only when we actually
446 * make the change. If we don't change anything (so if the returned
447 * prev is equal to old) then we aren't acquiring anything new and
448 * we don't need any memory barrier as far I can tell.
449 */
450
451#define __HAVE_ARCH_CMPXCHG 1
452
453static inline unsigned long
454__cmpxchg_u8(volatile char *m, long old, long new)
455{
456 unsigned long prev, tmp, cmp, addr64;
457
458 __asm__ __volatile__(
459 " andnot %5,7,%4\n"
460 " insbl %1,%5,%1\n"
461 "1: ldq_l %2,0(%4)\n"
462 " extbl %2,%5,%0\n"
463 " cmpeq %0,%6,%3\n"
464 " beq %3,2f\n"
465 " mskbl %2,%5,%2\n"
466 " or %1,%2,%2\n"
467 " stq_c %2,0(%4)\n"
468 " beq %2,3f\n"
469#ifdef CONFIG_SMP
470 " mb\n"
471#endif
472 "2:\n"
473 ".subsection 2\n"
474 "3: br 1b\n"
475 ".previous"
476 : "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64)
477 : "r" ((long)m), "Ir" (old), "1" (new) : "memory");
478
479 return prev;
480}
481
482static inline unsigned long
483__cmpxchg_u16(volatile short *m, long old, long new)
484{
485 unsigned long prev, tmp, cmp, addr64;
486
487 __asm__ __volatile__(
488 " andnot %5,7,%4\n"
489 " inswl %1,%5,%1\n"
490 "1: ldq_l %2,0(%4)\n"
491 " extwl %2,%5,%0\n"
492 " cmpeq %0,%6,%3\n"
493 " beq %3,2f\n"
494 " mskwl %2,%5,%2\n"
495 " or %1,%2,%2\n"
496 " stq_c %2,0(%4)\n"
497 " beq %2,3f\n"
498#ifdef CONFIG_SMP
499 " mb\n"
500#endif
501 "2:\n"
502 ".subsection 2\n"
503 "3: br 1b\n"
504 ".previous"
505 : "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64)
506 : "r" ((long)m), "Ir" (old), "1" (new) : "memory");
507
508 return prev;
509}
510
511static inline unsigned long
512__cmpxchg_u32(volatile int *m, int old, int new)
513{
514 unsigned long prev, cmp;
515
516 __asm__ __volatile__(
517 "1: ldl_l %0,%5\n"
518 " cmpeq %0,%3,%1\n"
519 " beq %1,2f\n"
520 " mov %4,%1\n"
521 " stl_c %1,%2\n"
522 " beq %1,3f\n"
523#ifdef CONFIG_SMP
524 " mb\n"
525#endif
526 "2:\n"
527 ".subsection 2\n"
528 "3: br 1b\n"
529 ".previous"
530 : "=&r"(prev), "=&r"(cmp), "=m"(*m)
531 : "r"((long) old), "r"(new), "m"(*m) : "memory");
532
533 return prev;
534}
535
536static inline unsigned long
537__cmpxchg_u64(volatile long *m, unsigned long old, unsigned long new)
538{
539 unsigned long prev, cmp;
540
541 __asm__ __volatile__(
542 "1: ldq_l %0,%5\n"
543 " cmpeq %0,%3,%1\n"
544 " beq %1,2f\n"
545 " mov %4,%1\n"
546 " stq_c %1,%2\n"
547 " beq %1,3f\n"
548#ifdef CONFIG_SMP
549 " mb\n"
550#endif
551 "2:\n"
552 ".subsection 2\n"
553 "3: br 1b\n"
554 ".previous"
555 : "=&r"(prev), "=&r"(cmp), "=m"(*m)
556 : "r"((long) old), "r"(new), "m"(*m) : "memory");
557
558 return prev;
559}
560
561/* This function doesn't exist, so you'll get a linker error
562 if something tries to do an invalid cmpxchg(). */
563extern void __cmpxchg_called_with_bad_pointer(void);
564
565static inline unsigned long
566__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
567{
568 switch (size) {
569 case 1:
570 return __cmpxchg_u8(ptr, old, new);
571 case 2:
572 return __cmpxchg_u16(ptr, old, new);
573 case 4:
574 return __cmpxchg_u32(ptr, old, new);
575 case 8:
576 return __cmpxchg_u64(ptr, old, new);
577 }
578 __cmpxchg_called_with_bad_pointer();
579 return old;
580}
581
582#define cmpxchg(ptr,o,n) \
583 ({ \
584 __typeof__(*(ptr)) _o_ = (o); \
585 __typeof__(*(ptr)) _n_ = (n); \
586 (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
587 (unsigned long)_n_, sizeof(*(ptr))); \
588 })
589
590#endif /* __ASSEMBLY__ */
591
592#define arch_align_stack(x) (x)
593
594#endif