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#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 */
24#include <linux/types.h>
25#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;
33
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
77#ifdef CONFIG_HARDWALL
78struct hardwall_info;
79#endif
80
81struct thread_struct {
82 /* kernel stack pointer */
83 unsigned long ksp;
84 /* kernel PC */
85 unsigned long pc;
86 /* starting user stack pointer (for page migration) */
87 unsigned long usp0;
88 /* pid of process that created this one */
89 pid_t creator_pid;
90#if CHIP_HAS_TILE_DMA()
91 /* DMA info for suspended threads (byte == 0 means no DMA state) */
92 struct tile_dma_state tile_dma_state;
93#endif
94 /* User EX_CONTEXT registers */
95 unsigned long ex_context[2];
96 /* User SYSTEM_SAVE registers */
97 unsigned long system_save[4];
98 /* User interrupt mask */
99 unsigned long long interrupt_mask;
100 /* User interrupt-control 0 state */
101 unsigned long intctrl_0;
102#if CHIP_HAS_PROC_STATUS_SPR()
103 /* Any other miscellaneous processor state bits */
104 unsigned long proc_status;
105#endif
106#ifdef CONFIG_HARDWALL
107 /* Is this task tied to an activated hardwall? */
108 struct hardwall_info *hardwall;
109 /* Chains this task into the list at hardwall->list. */
110 struct list_head hardwall_list;
111#endif
112#if CHIP_HAS_TILE_DMA()
113 /* Async DMA TLB fault information */
114 struct async_tlb dma_async_tlb;
115#endif
116#if CHIP_HAS_SN_PROC()
117 /* Was static network processor when we were switched out? */
118 int sn_proc_running;
119 /* Async SNI TLB fault information */
120 struct async_tlb sn_async_tlb;
121#endif
122};
123
124#endif /* !__ASSEMBLY__ */
125
126/*
127 * Start with "sp" this many bytes below the top of the kernel stack.
128 * This preserves the invariant that a called function may write to *sp.
129 */
130#define STACK_TOP_DELTA 8
131
132/*
133 * When entering the kernel via a fault, start with the top of the
134 * pt_regs structure this many bytes below the top of the page.
135 * This aligns the pt_regs structure optimally for cache-line access.
136 */
137#ifdef __tilegx__
138#define KSTK_PTREGS_GAP 48
139#else
140#define KSTK_PTREGS_GAP 56
141#endif
142
143#ifndef __ASSEMBLY__
144
145#ifdef __tilegx__
146#define TASK_SIZE_MAX (MEM_LOW_END + 1)
147#else
148#define TASK_SIZE_MAX PAGE_OFFSET
149#endif
150
151/* TASK_SIZE and related variables are always checked in "current" context. */
152#ifdef CONFIG_COMPAT
153#define COMPAT_TASK_SIZE (1UL << 31)
154#define TASK_SIZE ((current_thread_info()->status & TS_COMPAT) ?\
155 COMPAT_TASK_SIZE : TASK_SIZE_MAX)
156#else
157#define TASK_SIZE TASK_SIZE_MAX
158#endif
159
160/* We provide a minimal "vdso" a la x86; just the sigreturn code for now. */
161#define VDSO_BASE (TASK_SIZE - PAGE_SIZE)
162
163#define STACK_TOP VDSO_BASE
164
165/* STACK_TOP_MAX is used temporarily in execve and should not check COMPAT. */
166#define STACK_TOP_MAX TASK_SIZE_MAX
167
168/*
169 * This decides where the kernel will search for a free chunk of vm
170 * space during mmap's, if it is using bottom-up mapping.
171 */
172#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
173
174#define HAVE_ARCH_PICK_MMAP_LAYOUT
175
176#define INIT_THREAD { \
177 .ksp = (unsigned long)init_stack + THREAD_SIZE - STACK_TOP_DELTA, \
178 .interrupt_mask = -1ULL \
179}
180
181/* Kernel stack top for the task that first boots on this cpu. */
182DECLARE_PER_CPU(unsigned long, boot_sp);
183
184/* PC to boot from on this cpu. */
185DECLARE_PER_CPU(unsigned long, boot_pc);
186
187/* Do necessary setup to start up a newly executed thread. */
188static inline void start_thread(struct pt_regs *regs,
189 unsigned long pc, unsigned long usp)
190{
191 regs->pc = pc;
192 regs->sp = usp;
193}
194
195/* Free all resources held by a thread. */
196static inline void release_thread(struct task_struct *dead_task)
197{
198 /* Nothing for now */
199}
200
201/* Prepare to copy thread state - unlazy all lazy status. */
202#define prepare_to_copy(tsk) do { } while (0)
203
204extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
205
206
207/*
208 * Return saved (kernel) PC of a blocked thread.
209 * Only used in a printk() in kernel/sched.c, so don't work too hard.
210 */
211#define thread_saved_pc(t) ((t)->thread.pc)
212
213unsigned long get_wchan(struct task_struct *p);
214
215/* Return initial ksp value for given task. */
216#define task_ksp0(task) ((unsigned long)(task)->stack + THREAD_SIZE)
217
218/* Return some info about the user process TASK. */
219#define KSTK_TOP(task) (task_ksp0(task) - STACK_TOP_DELTA)
220#define task_pt_regs(task) \
221 ((struct pt_regs *)(task_ksp0(task) - KSTK_PTREGS_GAP) - 1)
222#define task_sp(task) (task_pt_regs(task)->sp)
223#define task_pc(task) (task_pt_regs(task)->pc)
224/* Aliases for pc and sp (used in fs/proc/array.c) */
225#define KSTK_EIP(task) task_pc(task)
226#define KSTK_ESP(task) task_sp(task)
227
228/* Standard format for printing registers and other word-size data. */
229#ifdef __tilegx__
230# define REGFMT "0x%016lx"
231#else
232# define REGFMT "0x%08lx"
233#endif
234
235/*
236 * Do some slow action (e.g. read a slow SPR).
237 * Note that this must also have compiler-barrier semantics since
238 * it may be used in a busy loop reading memory.
239 */
240static inline void cpu_relax(void)
241{
242 __insn_mfspr(SPR_PASS);
243 barrier();
244}
245
246struct siginfo;
247extern void arch_coredump_signal(struct siginfo *, struct pt_regs *);
248#define arch_coredump_signal arch_coredump_signal
249
250/* Info on this processor (see fs/proc/cpuinfo.c) */
251struct seq_operations;
252extern const struct seq_operations cpuinfo_op;
253
254/* Provide information about the chip model. */
255extern char chip_model[64];
256
257/* Data on which physical memory controller corresponds to which NUMA node. */
258extern int node_controller[];
259
260
261/* Do we dump information to the console when a user application crashes? */
262extern int show_crashinfo;
263
264#if CHIP_HAS_CBOX_HOME_MAP()
265/* Does the heap allocator return hash-for-home pages by default? */
266extern int hash_default;
267
268/* Should kernel stack pages be hash-for-home? */
269extern int kstack_hash;
270
271/* Does MAP_ANONYMOUS return hash-for-home pages by default? */
272#define uheap_hash hash_default
273
274#else
275#define hash_default 0
276#define kstack_hash 0
277#define uheap_hash 0
278#endif
279
280/* Are we using huge pages in the TLB for kernel data? */
281extern int kdata_huge;
282
283#define PREFETCH_STRIDE CHIP_L2_LINE_SIZE()
284
285#else /* __ASSEMBLY__ */
286
287/* Do some slow action (e.g. read a slow SPR). */
288#define CPU_RELAX mfspr zero, SPR_PASS
289
290#endif /* !__ASSEMBLY__ */
291
292/* Assembly code assumes that the PL is in the low bits. */
293#if SPR_EX_CONTEXT_1_1__PL_SHIFT != 0
294# error Fix assembly assumptions about PL
295#endif
296
297/* We sometimes use these macros for EX_CONTEXT_0_1 as well. */
298#if SPR_EX_CONTEXT_1_1__PL_SHIFT != SPR_EX_CONTEXT_0_1__PL_SHIFT || \
299 SPR_EX_CONTEXT_1_1__PL_RMASK != SPR_EX_CONTEXT_0_1__PL_RMASK || \
300 SPR_EX_CONTEXT_1_1__ICS_SHIFT != SPR_EX_CONTEXT_0_1__ICS_SHIFT || \
301 SPR_EX_CONTEXT_1_1__ICS_RMASK != SPR_EX_CONTEXT_0_1__ICS_RMASK
302# error Fix assumptions that EX1 macros work for both PL0 and PL1
303#endif
304
305/* Allow pulling apart and recombining the PL and ICS bits in EX_CONTEXT. */
306#define EX1_PL(ex1) \
307 (((ex1) >> SPR_EX_CONTEXT_1_1__PL_SHIFT) & SPR_EX_CONTEXT_1_1__PL_RMASK)
308#define EX1_ICS(ex1) \
309 (((ex1) >> SPR_EX_CONTEXT_1_1__ICS_SHIFT) & SPR_EX_CONTEXT_1_1__ICS_RMASK)
310#define PL_ICS_EX1(pl, ics) \
311 (((pl) << SPR_EX_CONTEXT_1_1__PL_SHIFT) | \
312 ((ics) << SPR_EX_CONTEXT_1_1__ICS_SHIFT))
313
314/*
315 * Provide symbolic constants for PLs.
316 * Note that assembly code assumes that USER_PL is zero.
317 */
318#define USER_PL 0
319#define KERNEL_PL 1
320
321/* SYSTEM_SAVE_1_0 holds the current cpu number ORed with ksp0. */
322#define CPU_LOG_MASK_VALUE 12
323#define CPU_MASK_VALUE ((1 << CPU_LOG_MASK_VALUE) - 1)
324#if CONFIG_NR_CPUS > CPU_MASK_VALUE
325# error Too many cpus!
326#endif
327#define raw_smp_processor_id() \
328 ((int)__insn_mfspr(SPR_SYSTEM_SAVE_1_0) & CPU_MASK_VALUE)
329#define get_current_ksp0() \
330 (__insn_mfspr(SPR_SYSTEM_SAVE_1_0) & ~CPU_MASK_VALUE)
331#define next_current_ksp0(task) ({ \
332 unsigned long __ksp0 = task_ksp0(task); \
333 int __cpu = raw_smp_processor_id(); \
334 BUG_ON(__ksp0 & CPU_MASK_VALUE); \
335 __ksp0 | __cpu; \
336})
337
338#endif /* _ASM_TILE_PROCESSOR_H */