Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
12 * more details.
13 */
14
15#ifndef _ASM_TILE_PROCESSOR_H
16#define _ASM_TILE_PROCESSOR_H
17
18#include <arch/chip.h>
19
20#ifndef __ASSEMBLY__
21
22/*
23 * NOTE: we don't include <linux/ptrace.h> or <linux/percpu.h> as one
24 * normally would, due to #include dependencies.
25 */
26#include <linux/types.h>
27#include <asm/ptrace.h>
28#include <asm/percpu.h>
29
30#include <arch/spr_def.h>
31
32struct task_struct;
33struct thread_struct;
34
35typedef struct {
36 unsigned long seg;
37} mm_segment_t;
38
39/*
40 * Default implementation of macro that returns current
41 * instruction pointer ("program counter").
42 */
43void *current_text_addr(void);
44
45#if CHIP_HAS_TILE_DMA()
46/* Capture the state of a suspended DMA. */
47struct tile_dma_state {
48 int enabled;
49 unsigned long src;
50 unsigned long dest;
51 unsigned long strides;
52 unsigned long chunk_size;
53 unsigned long src_chunk;
54 unsigned long dest_chunk;
55 unsigned long byte;
56 unsigned long status;
57};
58
59/*
60 * A mask of the DMA status register for selecting only the 'running'
61 * and 'done' bits.
62 */
63#define DMA_STATUS_MASK \
64 (SPR_DMA_STATUS__RUNNING_MASK | SPR_DMA_STATUS__DONE_MASK)
65#endif
66
67/*
68 * Track asynchronous TLB events (faults and access violations)
69 * that occur while we are in kernel mode from DMA or the SN processor.
70 */
71struct async_tlb {
72 short fault_num; /* original fault number; 0 if none */
73 char is_fault; /* was it a fault (vs an access violation) */
74 char is_write; /* for fault: was it caused by a write? */
75 unsigned long address; /* what address faulted? */
76};
77
78#ifdef CONFIG_HARDWALL
79struct hardwall_info;
80struct hardwall_task {
81 /* Which hardwall is this task tied to? (or NULL if none) */
82 struct hardwall_info *info;
83 /* Chains this task into the list at info->task_head. */
84 struct list_head list;
85};
86#ifdef __tilepro__
87#define HARDWALL_TYPES 1 /* udn */
88#else
89#define HARDWALL_TYPES 3 /* udn, idn, and ipi */
90#endif
91#endif
92
93struct thread_struct {
94 /* kernel stack pointer */
95 unsigned long ksp;
96 /* kernel PC */
97 unsigned long pc;
98 /* starting user stack pointer (for page migration) */
99 unsigned long usp0;
100 /* pid of process that created this one */
101 pid_t creator_pid;
102#if CHIP_HAS_TILE_DMA()
103 /* DMA info for suspended threads (byte == 0 means no DMA state) */
104 struct tile_dma_state tile_dma_state;
105#endif
106 /* User EX_CONTEXT registers */
107 unsigned long ex_context[2];
108 /* User SYSTEM_SAVE registers */
109 unsigned long system_save[4];
110 /* User interrupt mask */
111 unsigned long long interrupt_mask;
112 /* User interrupt-control 0 state */
113 unsigned long intctrl_0;
114 /* Any other miscellaneous processor state bits */
115 unsigned long proc_status;
116#if !CHIP_HAS_FIXED_INTVEC_BASE()
117 /* Interrupt base for PL0 interrupts */
118 unsigned long interrupt_vector_base;
119#endif
120 /* Tile cache retry fifo high-water mark */
121 unsigned long tile_rtf_hwm;
122#if CHIP_HAS_DSTREAM_PF()
123 /* Data stream prefetch control */
124 unsigned long dstream_pf;
125#endif
126#ifdef CONFIG_HARDWALL
127 /* Hardwall information for various resources. */
128 struct hardwall_task hardwall[HARDWALL_TYPES];
129#endif
130#if CHIP_HAS_TILE_DMA()
131 /* Async DMA TLB fault information */
132 struct async_tlb dma_async_tlb;
133#endif
134};
135
136#endif /* !__ASSEMBLY__ */
137
138/*
139 * Start with "sp" this many bytes below the top of the kernel stack.
140 * This allows us to be cache-aware when handling the initial save
141 * of the pt_regs value to the stack.
142 */
143#define STACK_TOP_DELTA 64
144
145/*
146 * When entering the kernel via a fault, start with the top of the
147 * pt_regs structure this many bytes below the top of the page.
148 * This aligns the pt_regs structure optimally for cache-line access.
149 */
150#ifdef __tilegx__
151#define KSTK_PTREGS_GAP 48
152#else
153#define KSTK_PTREGS_GAP 56
154#endif
155
156#ifndef __ASSEMBLY__
157
158#ifdef __tilegx__
159#define TASK_SIZE_MAX (_AC(1, UL) << (MAX_VA_WIDTH - 1))
160#else
161#define TASK_SIZE_MAX PAGE_OFFSET
162#endif
163
164/* TASK_SIZE and related variables are always checked in "current" context. */
165#ifdef CONFIG_COMPAT
166#define COMPAT_TASK_SIZE (1UL << 31)
167#define TASK_SIZE ((current_thread_info()->status & TS_COMPAT) ?\
168 COMPAT_TASK_SIZE : TASK_SIZE_MAX)
169#else
170#define TASK_SIZE TASK_SIZE_MAX
171#endif
172
173#define VDSO_BASE ((unsigned long)current->active_mm->context.vdso_base)
174#define VDSO_SYM(x) (VDSO_BASE + (unsigned long)(x))
175
176#define STACK_TOP TASK_SIZE
177
178/* STACK_TOP_MAX is used temporarily in execve and should not check COMPAT. */
179#define STACK_TOP_MAX TASK_SIZE_MAX
180
181/*
182 * This decides where the kernel will search for a free chunk of vm
183 * space during mmap's, if it is using bottom-up mapping.
184 */
185#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
186
187#define HAVE_ARCH_PICK_MMAP_LAYOUT
188
189#define INIT_THREAD { \
190 .ksp = (unsigned long)init_stack + THREAD_SIZE - STACK_TOP_DELTA, \
191 .interrupt_mask = -1ULL \
192}
193
194/* Kernel stack top for the task that first boots on this cpu. */
195DECLARE_PER_CPU(unsigned long, boot_sp);
196
197/* PC to boot from on this cpu. */
198DECLARE_PER_CPU(unsigned long, boot_pc);
199
200/* Do necessary setup to start up a newly executed thread. */
201static inline void start_thread(struct pt_regs *regs,
202 unsigned long pc, unsigned long usp)
203{
204 regs->pc = pc;
205 regs->sp = usp;
206 single_step_execve();
207}
208
209/* Free all resources held by a thread. */
210static inline void release_thread(struct task_struct *dead_task)
211{
212 /* Nothing for now */
213}
214
215extern int do_work_pending(struct pt_regs *regs, u32 flags);
216
217
218/*
219 * Return saved (kernel) PC of a blocked thread.
220 * Only used in a printk() in kernel/sched/core.c, so don't work too hard.
221 */
222#define thread_saved_pc(t) ((t)->thread.pc)
223
224unsigned long get_wchan(struct task_struct *p);
225
226/* Return initial ksp value for given task. */
227#define task_ksp0(task) \
228 ((unsigned long)(task)->stack + THREAD_SIZE - STACK_TOP_DELTA)
229
230/* Return some info about the user process TASK. */
231#define task_pt_regs(task) \
232 ((struct pt_regs *)(task_ksp0(task) - KSTK_PTREGS_GAP) - 1)
233#define current_pt_regs() \
234 ((struct pt_regs *)((stack_pointer | (THREAD_SIZE - 1)) - \
235 STACK_TOP_DELTA - (KSTK_PTREGS_GAP - 1)) - 1)
236#define task_sp(task) (task_pt_regs(task)->sp)
237#define task_pc(task) (task_pt_regs(task)->pc)
238/* Aliases for pc and sp (used in fs/proc/array.c) */
239#define KSTK_EIP(task) task_pc(task)
240#define KSTK_ESP(task) task_sp(task)
241
242/* Fine-grained unaligned JIT support */
243#define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr))
244#define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val))
245
246extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
247extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
248
249/* Standard format for printing registers and other word-size data. */
250#ifdef __tilegx__
251# define REGFMT "0x%016lx"
252#else
253# define REGFMT "0x%08lx"
254#endif
255
256/*
257 * Do some slow action (e.g. read a slow SPR).
258 * Note that this must also have compiler-barrier semantics since
259 * it may be used in a busy loop reading memory.
260 */
261static inline void cpu_relax(void)
262{
263 __insn_mfspr(SPR_PASS);
264 barrier();
265}
266
267#define cpu_relax_lowlatency() cpu_relax()
268
269/* Info on this processor (see fs/proc/cpuinfo.c) */
270struct seq_operations;
271extern const struct seq_operations cpuinfo_op;
272
273/* Provide information about the chip model. */
274extern char chip_model[64];
275
276/* Data on which physical memory controller corresponds to which NUMA node. */
277extern int node_controller[];
278
279/* Does the heap allocator return hash-for-home pages by default? */
280extern int hash_default;
281
282/* Should kernel stack pages be hash-for-home? */
283extern int kstack_hash;
284
285/* Does MAP_ANONYMOUS return hash-for-home pages by default? */
286#define uheap_hash hash_default
287
288
289/* Are we using huge pages in the TLB for kernel data? */
290extern int kdata_huge;
291
292/* Support standard Linux prefetching. */
293#define ARCH_HAS_PREFETCH
294#define prefetch(x) __builtin_prefetch(x)
295#define PREFETCH_STRIDE CHIP_L2_LINE_SIZE()
296
297/* Bring a value into the L1D, faulting the TLB if necessary. */
298#ifdef __tilegx__
299#define prefetch_L1(x) __insn_prefetch_l1_fault((void *)(x))
300#else
301#define prefetch_L1(x) __insn_prefetch_L1((void *)(x))
302#endif
303
304#else /* __ASSEMBLY__ */
305
306/* Do some slow action (e.g. read a slow SPR). */
307#define CPU_RELAX mfspr zero, SPR_PASS
308
309#endif /* !__ASSEMBLY__ */
310
311/* Assembly code assumes that the PL is in the low bits. */
312#if SPR_EX_CONTEXT_1_1__PL_SHIFT != 0
313# error Fix assembly assumptions about PL
314#endif
315
316/* We sometimes use these macros for EX_CONTEXT_0_1 as well. */
317#if SPR_EX_CONTEXT_1_1__PL_SHIFT != SPR_EX_CONTEXT_0_1__PL_SHIFT || \
318 SPR_EX_CONTEXT_1_1__PL_RMASK != SPR_EX_CONTEXT_0_1__PL_RMASK || \
319 SPR_EX_CONTEXT_1_1__ICS_SHIFT != SPR_EX_CONTEXT_0_1__ICS_SHIFT || \
320 SPR_EX_CONTEXT_1_1__ICS_RMASK != SPR_EX_CONTEXT_0_1__ICS_RMASK
321# error Fix assumptions that EX1 macros work for both PL0 and PL1
322#endif
323
324/* Allow pulling apart and recombining the PL and ICS bits in EX_CONTEXT. */
325#define EX1_PL(ex1) \
326 (((ex1) >> SPR_EX_CONTEXT_1_1__PL_SHIFT) & SPR_EX_CONTEXT_1_1__PL_RMASK)
327#define EX1_ICS(ex1) \
328 (((ex1) >> SPR_EX_CONTEXT_1_1__ICS_SHIFT) & SPR_EX_CONTEXT_1_1__ICS_RMASK)
329#define PL_ICS_EX1(pl, ics) \
330 (((pl) << SPR_EX_CONTEXT_1_1__PL_SHIFT) | \
331 ((ics) << SPR_EX_CONTEXT_1_1__ICS_SHIFT))
332
333/*
334 * Provide symbolic constants for PLs.
335 */
336#define USER_PL 0
337#if CONFIG_KERNEL_PL == 2
338#define GUEST_PL 1
339#endif
340#define KERNEL_PL CONFIG_KERNEL_PL
341
342/* SYSTEM_SAVE_K_0 holds the current cpu number ORed with ksp0. */
343#ifdef __tilegx__
344#define CPU_SHIFT 48
345#if CHIP_VA_WIDTH() > CPU_SHIFT
346# error Too many VA bits!
347#endif
348#define MAX_CPU_ID ((1 << (64 - CPU_SHIFT)) - 1)
349#define raw_smp_processor_id() \
350 ((int)(__insn_mfspr(SPR_SYSTEM_SAVE_K_0) >> CPU_SHIFT))
351#define get_current_ksp0() \
352 ((unsigned long)(((long)__insn_mfspr(SPR_SYSTEM_SAVE_K_0) << \
353 (64 - CPU_SHIFT)) >> (64 - CPU_SHIFT)))
354#define next_current_ksp0(task) ({ \
355 unsigned long __ksp0 = task_ksp0(task) & ((1UL << CPU_SHIFT) - 1); \
356 unsigned long __cpu = (long)raw_smp_processor_id() << CPU_SHIFT; \
357 __ksp0 | __cpu; \
358})
359#else
360#define LOG2_NR_CPU_IDS 6
361#define MAX_CPU_ID ((1 << LOG2_NR_CPU_IDS) - 1)
362#define raw_smp_processor_id() \
363 ((int)__insn_mfspr(SPR_SYSTEM_SAVE_K_0) & MAX_CPU_ID)
364#define get_current_ksp0() \
365 (__insn_mfspr(SPR_SYSTEM_SAVE_K_0) & ~MAX_CPU_ID)
366#define next_current_ksp0(task) ({ \
367 unsigned long __ksp0 = task_ksp0(task); \
368 int __cpu = raw_smp_processor_id(); \
369 BUG_ON(__ksp0 & MAX_CPU_ID); \
370 __ksp0 | __cpu; \
371})
372#endif
373#if CONFIG_NR_CPUS > (MAX_CPU_ID + 1)
374# error Too many cpus!
375#endif
376
377#endif /* _ASM_TILE_PROCESSOR_H */