2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1994 Waldorf GMBH
7 * Copyright (C) 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003 Ralf Baechle
8 * Copyright (C) 1996 Paul M. Antoine
9 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
11 #ifndef _ASM_PROCESSOR_H
12 #define _ASM_PROCESSOR_H
14 #include <linux/cpumask.h>
15 #include <linux/threads.h>
17 #include <asm/cachectl.h>
19 #include <asm/cpu-info.h>
20 #include <asm/mipsregs.h>
21 #include <asm/prefetch.h>
22 #include <asm/system.h>
25 * Return current * instruction pointer ("program counter").
27 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
30 * System setup and hardware flags..
32 extern void (*cpu_wait)(void);
34 extern unsigned int vced_count, vcei_count;
38 * User space process size: 2GB. This is hardcoded into a few places,
39 * so don't change it unless you know what you are doing.
41 #define TASK_SIZE 0x7fff8000UL
44 * This decides where the kernel will search for a free chunk of vm
45 * space during mmap's.
47 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
52 * User space process size: 1TB. This is hardcoded into a few places,
53 * so don't change it unless you know what you are doing. TASK_SIZE
54 * is limited to 1TB by the R4000 architecture; R10000 and better can
55 * support 16TB; the architectural reserve for future expansion is
58 #define TASK_SIZE32 0x7fff8000UL
59 #define TASK_SIZE 0x10000000000UL
62 * This decides where the kernel will search for a free chunk of vm
63 * space during mmap's.
65 #define TASK_UNMAPPED_BASE \
66 (test_thread_flag(TIF_32BIT_ADDR) ? \
67 PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3))
68 #define TASK_SIZE_OF(tsk) \
69 (test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)
72 #define NUM_FPU_REGS 32
74 typedef __u64 fpureg_t;
77 * It would be nice to add some more fields for emulator statistics, but there
78 * are a number of fixed offsets in offset.h and elsewhere that would have to
79 * be recalculated by hand. So the additional information will be private to
80 * the FPU emulator for now. See asm-mips/fpu_emulator.h.
83 struct mips_fpu_struct {
84 fpureg_t fpr[NUM_FPU_REGS];
88 #define NUM_DSP_REGS 6
90 typedef __u32 dspreg_t;
92 struct mips_dsp_state {
93 dspreg_t dspr[NUM_DSP_REGS];
94 unsigned int dspcontrol;
97 #define INIT_CPUMASK { \
105 #define ARCH_MIN_TASKALIGN 8
110 * If you change thread_struct remember to change the #defines below too!
112 struct thread_struct {
113 /* Saved main processor registers. */
115 unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
116 unsigned long reg29, reg30, reg31;
118 /* Saved cp0 stuff. */
119 unsigned long cp0_status;
121 /* Saved fpu/fpu emulator stuff. */
122 struct mips_fpu_struct fpu;
123 #ifdef CONFIG_MIPS_MT_FPAFF
124 /* Emulated instruction count */
125 unsigned long emulated_fp;
126 /* Saved per-thread scheduler affinity mask */
127 cpumask_t user_cpus_allowed;
128 #endif /* CONFIG_MIPS_MT_FPAFF */
130 /* Saved state of the DSP ASE, if available. */
131 struct mips_dsp_state dsp;
133 /* Other stuff associated with the thread. */
134 unsigned long cp0_badvaddr; /* Last user fault */
135 unsigned long cp0_baduaddr; /* Last kernel fault accessing USEG */
136 unsigned long error_code;
137 unsigned long trap_no;
138 unsigned long irix_trampoline; /* Wheee... */
139 unsigned long irix_oldctx;
140 struct mips_abi *abi;
143 #ifdef CONFIG_MIPS_MT_FPAFF
146 .user_cpus_allowed = INIT_CPUMASK,
149 #endif /* CONFIG_MIPS_MT_FPAFF */
151 #define INIT_THREAD { \
153 * Saved main processor registers \
171 * Saved FPU/FPU emulator stuff \
178 * FPU affinity state (null if not FPAFF) \
189 * Other stuff associated with the process \
195 .irix_trampoline = 0, \
201 /* Free all resources held by a thread. */
202 #define release_thread(thread) do { } while(0)
204 /* Prepare to copy thread state - unlazy all lazy status */
205 #define prepare_to_copy(tsk) do { } while (0)
207 extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
209 extern unsigned long thread_saved_pc(struct task_struct *tsk);
212 * Do necessary setup to start up a newly executed thread.
214 extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
216 unsigned long get_wchan(struct task_struct *p);
218 #define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + THREAD_SIZE - 32)
219 #define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk) - 1)
220 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc)
221 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29])
222 #define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status)
224 #define cpu_relax() barrier()
227 * Return_address is a replacement for __builtin_return_address(count)
228 * which on certain architectures cannot reasonably be implemented in GCC
229 * (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386).
230 * Note that __builtin_return_address(x>=1) is forbidden because GCC
231 * aborts compilation on some CPUs. It's simply not possible to unwind
232 * some CPU's stackframes.
234 * __builtin_return_address works only for non-leaf functions. We avoid the
235 * overhead of a function call by forcing the compiler to save the return
236 * address register on the stack.
238 #define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})
240 #ifdef CONFIG_CPU_HAS_PREFETCH
242 #define ARCH_HAS_PREFETCH
244 static inline void prefetch(const void *addr)
246 __asm__ __volatile__(
251 : "i" (Pref_Load), "r" (addr));
256 #endif /* _ASM_PROCESSOR_H */