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Chris Metcalf867e3592010-05-28 23:09:12 -04001/*
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#ifndef __ASSEMBLY__
19
20/*
21 * NOTE: we don't include <linux/ptrace.h> or <linux/percpu.h> as one
22 * normally would, due to #include dependencies.
23 */
Chris Metcalf9f9c0382010-06-25 17:00:56 -040024#include <linux/types.h>
Chris Metcalf867e3592010-05-28 23:09:12 -040025#include <asm/ptrace.h>
26#include <asm/percpu.h>
27
28#include <arch/chip.h>
29#include <arch/spr_def.h>
30
31struct task_struct;
32struct thread_struct;
Chris Metcalf867e3592010-05-28 23:09:12 -040033
34typedef struct {
35 unsigned long seg;
36} mm_segment_t;
37
38/*
39 * Default implementation of macro that returns current
40 * instruction pointer ("program counter").
41 */
42void *current_text_addr(void);
43
44#if CHIP_HAS_TILE_DMA()
45/* Capture the state of a suspended DMA. */
46struct tile_dma_state {
47 int enabled;
48 unsigned long src;
49 unsigned long dest;
50 unsigned long strides;
51 unsigned long chunk_size;
52 unsigned long src_chunk;
53 unsigned long dest_chunk;
54 unsigned long byte;
55 unsigned long status;
56};
57
58/*
59 * A mask of the DMA status register for selecting only the 'running'
60 * and 'done' bits.
61 */
62#define DMA_STATUS_MASK \
63 (SPR_DMA_STATUS__RUNNING_MASK | SPR_DMA_STATUS__DONE_MASK)
64#endif
65
66/*
67 * Track asynchronous TLB events (faults and access violations)
68 * that occur while we are in kernel mode from DMA or the SN processor.
69 */
70struct async_tlb {
71 short fault_num; /* original fault number; 0 if none */
72 char is_fault; /* was it a fault (vs an access violation) */
73 char is_write; /* for fault: was it caused by a write? */
74 unsigned long address; /* what address faulted? */
75};
76
Chris Metcalf9f9c0382010-06-25 17:00:56 -040077#ifdef CONFIG_HARDWALL
78struct hardwall_info;
Chris Metcalfb8ace082012-03-30 16:01:48 -040079struct hardwall_task {
80 /* Which hardwall is this task tied to? (or NULL if none) */
81 struct hardwall_info *info;
82 /* Chains this task into the list at info->task_head. */
83 struct list_head list;
84};
85#ifdef __tilepro__
86#define HARDWALL_TYPES 1 /* udn */
87#else
88#define HARDWALL_TYPES 3 /* udn, idn, and ipi */
89#endif
Chris Metcalf9f9c0382010-06-25 17:00:56 -040090#endif
Chris Metcalf867e3592010-05-28 23:09:12 -040091
92struct thread_struct {
93 /* kernel stack pointer */
94 unsigned long ksp;
95 /* kernel PC */
96 unsigned long pc;
97 /* starting user stack pointer (for page migration) */
98 unsigned long usp0;
99 /* pid of process that created this one */
100 pid_t creator_pid;
101#if CHIP_HAS_TILE_DMA()
102 /* DMA info for suspended threads (byte == 0 means no DMA state) */
103 struct tile_dma_state tile_dma_state;
104#endif
105 /* User EX_CONTEXT registers */
106 unsigned long ex_context[2];
107 /* User SYSTEM_SAVE registers */
108 unsigned long system_save[4];
109 /* User interrupt mask */
110 unsigned long long interrupt_mask;
111 /* User interrupt-control 0 state */
112 unsigned long intctrl_0;
113#if CHIP_HAS_PROC_STATUS_SPR()
114 /* Any other miscellaneous processor state bits */
115 unsigned long proc_status;
116#endif
Chris Metcalfa802fc62010-09-15 11:16:10 -0400117#if !CHIP_HAS_FIXED_INTVEC_BASE()
118 /* Interrupt base for PL0 interrupts */
119 unsigned long interrupt_vector_base;
120#endif
121#if CHIP_HAS_TILE_RTF_HWM()
122 /* Tile cache retry fifo high-water mark */
123 unsigned long tile_rtf_hwm;
124#endif
125#if CHIP_HAS_DSTREAM_PF()
126 /* Data stream prefetch control */
127 unsigned long dstream_pf;
128#endif
Chris Metcalf9f9c0382010-06-25 17:00:56 -0400129#ifdef CONFIG_HARDWALL
Chris Metcalfb8ace082012-03-30 16:01:48 -0400130 /* Hardwall information for various resources. */
131 struct hardwall_task hardwall[HARDWALL_TYPES];
Chris Metcalf9f9c0382010-06-25 17:00:56 -0400132#endif
Chris Metcalf867e3592010-05-28 23:09:12 -0400133#if CHIP_HAS_TILE_DMA()
134 /* Async DMA TLB fault information */
135 struct async_tlb dma_async_tlb;
136#endif
137#if CHIP_HAS_SN_PROC()
138 /* Was static network processor when we were switched out? */
139 int sn_proc_running;
140 /* Async SNI TLB fault information */
141 struct async_tlb sn_async_tlb;
142#endif
143};
144
145#endif /* !__ASSEMBLY__ */
146
147/*
148 * Start with "sp" this many bytes below the top of the kernel stack.
149 * This preserves the invariant that a called function may write to *sp.
150 */
151#define STACK_TOP_DELTA 8
152
153/*
154 * When entering the kernel via a fault, start with the top of the
155 * pt_regs structure this many bytes below the top of the page.
156 * This aligns the pt_regs structure optimally for cache-line access.
157 */
158#ifdef __tilegx__
159#define KSTK_PTREGS_GAP 48
160#else
161#define KSTK_PTREGS_GAP 56
162#endif
163
164#ifndef __ASSEMBLY__
165
166#ifdef __tilegx__
167#define TASK_SIZE_MAX (MEM_LOW_END + 1)
168#else
169#define TASK_SIZE_MAX PAGE_OFFSET
170#endif
171
172/* TASK_SIZE and related variables are always checked in "current" context. */
173#ifdef CONFIG_COMPAT
174#define COMPAT_TASK_SIZE (1UL << 31)
175#define TASK_SIZE ((current_thread_info()->status & TS_COMPAT) ?\
176 COMPAT_TASK_SIZE : TASK_SIZE_MAX)
177#else
178#define TASK_SIZE TASK_SIZE_MAX
179#endif
180
181/* We provide a minimal "vdso" a la x86; just the sigreturn code for now. */
182#define VDSO_BASE (TASK_SIZE - PAGE_SIZE)
183
184#define STACK_TOP VDSO_BASE
185
186/* STACK_TOP_MAX is used temporarily in execve and should not check COMPAT. */
187#define STACK_TOP_MAX TASK_SIZE_MAX
188
189/*
190 * This decides where the kernel will search for a free chunk of vm
191 * space during mmap's, if it is using bottom-up mapping.
192 */
193#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
194
195#define HAVE_ARCH_PICK_MMAP_LAYOUT
196
197#define INIT_THREAD { \
198 .ksp = (unsigned long)init_stack + THREAD_SIZE - STACK_TOP_DELTA, \
199 .interrupt_mask = -1ULL \
200}
201
202/* Kernel stack top for the task that first boots on this cpu. */
203DECLARE_PER_CPU(unsigned long, boot_sp);
204
205/* PC to boot from on this cpu. */
206DECLARE_PER_CPU(unsigned long, boot_pc);
207
208/* Do necessary setup to start up a newly executed thread. */
209static inline void start_thread(struct pt_regs *regs,
210 unsigned long pc, unsigned long usp)
211{
212 regs->pc = pc;
213 regs->sp = usp;
214}
215
216/* Free all resources held by a thread. */
217static inline void release_thread(struct task_struct *dead_task)
218{
219 /* Nothing for now */
220}
221
Chris Metcalf867e3592010-05-28 23:09:12 -0400222extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
223
Chris Metcalf313ce672011-05-02 14:50:06 -0400224extern int do_work_pending(struct pt_regs *regs, u32 flags);
225
Chris Metcalf867e3592010-05-28 23:09:12 -0400226
227/*
228 * Return saved (kernel) PC of a blocked thread.
229 * Only used in a printk() in kernel/sched.c, so don't work too hard.
230 */
231#define thread_saved_pc(t) ((t)->thread.pc)
232
233unsigned long get_wchan(struct task_struct *p);
234
235/* Return initial ksp value for given task. */
236#define task_ksp0(task) ((unsigned long)(task)->stack + THREAD_SIZE)
237
238/* Return some info about the user process TASK. */
239#define KSTK_TOP(task) (task_ksp0(task) - STACK_TOP_DELTA)
240#define task_pt_regs(task) \
241 ((struct pt_regs *)(task_ksp0(task) - KSTK_PTREGS_GAP) - 1)
Al Viro733deca2012-10-20 13:13:11 -0400242#define current_pt_regs() \
243 ((struct pt_regs *)((stack_pointer | (THREAD_SIZE - 1)) - \
244 (KSTK_PTREGS_GAP - 1)) - 1)
Chris Metcalf867e3592010-05-28 23:09:12 -0400245#define task_sp(task) (task_pt_regs(task)->sp)
246#define task_pc(task) (task_pt_regs(task)->pc)
247/* Aliases for pc and sp (used in fs/proc/array.c) */
248#define KSTK_EIP(task) task_pc(task)
249#define KSTK_ESP(task) task_sp(task)
250
251/* Standard format for printing registers and other word-size data. */
252#ifdef __tilegx__
253# define REGFMT "0x%016lx"
254#else
255# define REGFMT "0x%08lx"
256#endif
257
258/*
259 * Do some slow action (e.g. read a slow SPR).
260 * Note that this must also have compiler-barrier semantics since
261 * it may be used in a busy loop reading memory.
262 */
263static inline void cpu_relax(void)
264{
265 __insn_mfspr(SPR_PASS);
266 barrier();
267}
268
Chris Metcalf9f9c0382010-06-25 17:00:56 -0400269/* Info on this processor (see fs/proc/cpuinfo.c) */
270struct seq_operations;
271extern const struct seq_operations cpuinfo_op;
272
Chris Metcalf867e3592010-05-28 23:09:12 -0400273/* 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
Chris Metcalf867e3592010-05-28 23:09:12 -0400279#if CHIP_HAS_CBOX_HOME_MAP()
280/* Does the heap allocator return hash-for-home pages by default? */
281extern int hash_default;
282
283/* Should kernel stack pages be hash-for-home? */
284extern int kstack_hash;
Chris Metcalfef06f552010-07-02 14:19:35 -0400285
286/* Does MAP_ANONYMOUS return hash-for-home pages by default? */
287#define uheap_hash hash_default
288
Chris Metcalf867e3592010-05-28 23:09:12 -0400289#else
290#define hash_default 0
291#define kstack_hash 0
Chris Metcalfef06f552010-07-02 14:19:35 -0400292#define uheap_hash 0
Chris Metcalf867e3592010-05-28 23:09:12 -0400293#endif
294
295/* Are we using huge pages in the TLB for kernel data? */
296extern int kdata_huge;
297
Chris Metcalfe5a06932010-11-01 17:00:37 -0400298/* Support standard Linux prefetching. */
299#define ARCH_HAS_PREFETCH
300#define prefetch(x) __builtin_prefetch(x)
Chris Metcalfef06f552010-07-02 14:19:35 -0400301#define PREFETCH_STRIDE CHIP_L2_LINE_SIZE()
Chris Metcalf867e3592010-05-28 23:09:12 -0400302
Chris Metcalfe5a06932010-11-01 17:00:37 -0400303/* Bring a value into the L1D, faulting the TLB if necessary. */
304#ifdef __tilegx__
305#define prefetch_L1(x) __insn_prefetch_l1_fault((void *)(x))
306#else
307#define prefetch_L1(x) __insn_prefetch_L1((void *)(x))
308#endif
309
Chris Metcalf867e3592010-05-28 23:09:12 -0400310#else /* __ASSEMBLY__ */
311
312/* Do some slow action (e.g. read a slow SPR). */
313#define CPU_RELAX mfspr zero, SPR_PASS
314
315#endif /* !__ASSEMBLY__ */
316
317/* Assembly code assumes that the PL is in the low bits. */
318#if SPR_EX_CONTEXT_1_1__PL_SHIFT != 0
319# error Fix assembly assumptions about PL
320#endif
321
322/* We sometimes use these macros for EX_CONTEXT_0_1 as well. */
323#if SPR_EX_CONTEXT_1_1__PL_SHIFT != SPR_EX_CONTEXT_0_1__PL_SHIFT || \
324 SPR_EX_CONTEXT_1_1__PL_RMASK != SPR_EX_CONTEXT_0_1__PL_RMASK || \
325 SPR_EX_CONTEXT_1_1__ICS_SHIFT != SPR_EX_CONTEXT_0_1__ICS_SHIFT || \
326 SPR_EX_CONTEXT_1_1__ICS_RMASK != SPR_EX_CONTEXT_0_1__ICS_RMASK
327# error Fix assumptions that EX1 macros work for both PL0 and PL1
328#endif
329
330/* Allow pulling apart and recombining the PL and ICS bits in EX_CONTEXT. */
331#define EX1_PL(ex1) \
332 (((ex1) >> SPR_EX_CONTEXT_1_1__PL_SHIFT) & SPR_EX_CONTEXT_1_1__PL_RMASK)
333#define EX1_ICS(ex1) \
334 (((ex1) >> SPR_EX_CONTEXT_1_1__ICS_SHIFT) & SPR_EX_CONTEXT_1_1__ICS_RMASK)
335#define PL_ICS_EX1(pl, ics) \
336 (((pl) << SPR_EX_CONTEXT_1_1__PL_SHIFT) | \
337 ((ics) << SPR_EX_CONTEXT_1_1__ICS_SHIFT))
338
339/*
340 * Provide symbolic constants for PLs.
341 * Note that assembly code assumes that USER_PL is zero.
342 */
343#define USER_PL 0
Chris Metcalfa78c9422010-10-14 16:23:03 -0400344#if CONFIG_KERNEL_PL == 2
345#define GUEST_PL 1
346#endif
347#define KERNEL_PL CONFIG_KERNEL_PL
Chris Metcalf867e3592010-05-28 23:09:12 -0400348
Chris Metcalfa78c9422010-10-14 16:23:03 -0400349/* SYSTEM_SAVE_K_0 holds the current cpu number ORed with ksp0. */
Chris Metcalf867e3592010-05-28 23:09:12 -0400350#define CPU_LOG_MASK_VALUE 12
351#define CPU_MASK_VALUE ((1 << CPU_LOG_MASK_VALUE) - 1)
352#if CONFIG_NR_CPUS > CPU_MASK_VALUE
353# error Too many cpus!
354#endif
355#define raw_smp_processor_id() \
Chris Metcalfa78c9422010-10-14 16:23:03 -0400356 ((int)__insn_mfspr(SPR_SYSTEM_SAVE_K_0) & CPU_MASK_VALUE)
Chris Metcalf867e3592010-05-28 23:09:12 -0400357#define get_current_ksp0() \
Chris Metcalfa78c9422010-10-14 16:23:03 -0400358 (__insn_mfspr(SPR_SYSTEM_SAVE_K_0) & ~CPU_MASK_VALUE)
Chris Metcalf867e3592010-05-28 23:09:12 -0400359#define next_current_ksp0(task) ({ \
360 unsigned long __ksp0 = task_ksp0(task); \
361 int __cpu = raw_smp_processor_id(); \
362 BUG_ON(__ksp0 & CPU_MASK_VALUE); \
363 __ksp0 | __cpu; \
364})
365
366#endif /* _ASM_TILE_PROCESSOR_H */