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/config.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;
37 * Bus types (default is ISA, but people can check others with these..)
40 #define MCA_bus__is_a_macro /* for versions in ksyms.c */
44 * User space process size: 2GB. This is hardcoded into a few places,
45 * so don't change it unless you know what you are doing.
47 #define TASK_SIZE 0x7fff8000UL
50 * This decides where the kernel will search for a free chunk of vm
51 * space during mmap's.
53 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
58 * User space process size: 1TB. This is hardcoded into a few places,
59 * so don't change it unless you know what you are doing. TASK_SIZE
60 * is limited to 1TB by the R4000 architecture; R10000 and better can
61 * support 16TB; the architectural reserve for future expansion is
64 #define TASK_SIZE32 0x7fff8000UL
65 #define TASK_SIZE 0x10000000000UL
68 * This decides where the kernel will search for a free chunk of vm
69 * space during mmap's.
71 #define TASK_UNMAPPED_BASE ((current->thread.mflags & MF_32BIT_ADDR) ? \
72 PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3))
76 * Size of io_bitmap in longwords.
78 #define IO_BITMAP_SIZE 2048
80 #define NUM_FPU_REGS 32
82 typedef __u64 fpureg_t;
84 struct mips_fpu_hard_struct {
85 fpureg_t fpr[NUM_FPU_REGS];
90 * It would be nice to add some more fields for emulator statistics, but there
91 * are a number of fixed offsets in offset.h and elsewhere that would have to
92 * be recalculated by hand. So the additional information will be private to
93 * the FPU emulator for now. See asm-mips/fpu_emulator.h.
96 struct mips_fpu_soft_struct {
97 fpureg_t fpr[NUM_FPU_REGS];
101 union mips_fpu_union {
102 struct mips_fpu_hard_struct hard;
103 struct mips_fpu_soft_struct soft;
114 #define ARCH_MIN_TASKALIGN 8
117 * If you change thread_struct remember to change the #defines below too!
119 struct thread_struct {
120 /* Saved main processor registers. */
122 unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
123 unsigned long reg29, reg30, reg31;
125 /* Saved cp0 stuff. */
126 unsigned long cp0_status;
128 /* Saved fpu/fpu emulator stuff. */
129 union mips_fpu_union fpu;
131 /* Other stuff associated with the thread. */
132 unsigned long cp0_badvaddr; /* Last user fault */
133 unsigned long cp0_baduaddr; /* Last kernel fault accessing USEG */
134 unsigned long error_code;
135 unsigned long trap_no;
136 #define MF_FIXADE 1 /* Fix address errors in software */
137 #define MF_LOGADE 2 /* Log address errors to syslog */
138 #define MF_32BIT_REGS 4 /* also implies 16/32 fprs */
139 #define MF_32BIT_ADDR 8 /* 32-bit address space (o32/n32) */
140 unsigned long mflags;
141 unsigned long irix_trampoline; /* Wheee... */
142 unsigned long irix_oldctx;
145 #define MF_ABI_MASK (MF_32BIT_REGS | MF_32BIT_ADDR)
146 #define MF_O32 (MF_32BIT_REGS | MF_32BIT_ADDR)
147 #define MF_N32 MF_32BIT_ADDR
150 #define INIT_THREAD { \
152 * saved main processor registers \
154 0, 0, 0, 0, 0, 0, 0, 0, \
161 * saved fpu/fpu emulator stuff \
165 * Other stuff associated with the process \
169 * For now the default is to fix address errors \
176 /* Free all resources held by a thread. */
177 #define release_thread(thread) do { } while(0)
179 /* Prepare to copy thread state - unlazy all lazy status */
180 #define prepare_to_copy(tsk) do { } while (0)
182 extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
184 extern unsigned long thread_saved_pc(struct task_struct *tsk);
187 * Do necessary setup to start up a newly executed thread.
189 extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
191 unsigned long get_wchan(struct task_struct *p);
193 #define __PT_REG(reg) ((long)&((struct pt_regs *)0)->reg - sizeof(struct pt_regs))
194 #define __KSTK_TOS(tsk) ((unsigned long)(tsk->thread_info) + THREAD_SIZE - 32)
195 #define KSTK_EIP(tsk) (*(unsigned long *)(__KSTK_TOS(tsk) + __PT_REG(cp0_epc)))
196 #define KSTK_ESP(tsk) (*(unsigned long *)(__KSTK_TOS(tsk) + __PT_REG(regs[29])))
197 #define KSTK_STATUS(tsk) (*(unsigned long *)(__KSTK_TOS(tsk) + __PT_REG(cp0_status)))
199 #define cpu_relax() barrier()
202 * Return_address is a replacement for __builtin_return_address(count)
203 * which on certain architectures cannot reasonably be implemented in GCC
204 * (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386).
205 * Note that __builtin_return_address(x>=1) is forbidden because GCC
206 * aborts compilation on some CPUs. It's simply not possible to unwind
207 * some CPU's stackframes.
209 * __builtin_return_address works only for non-leaf functions. We avoid the
210 * overhead of a function call by forcing the compiler to save the return
211 * address register on the stack.
213 #define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})
215 #ifdef CONFIG_CPU_HAS_PREFETCH
217 #define ARCH_HAS_PREFETCH
219 extern inline void prefetch(const void *addr)
221 __asm__ __volatile__(
226 : "i" (Pref_Load), "r" (addr));
231 #endif /* _ASM_PROCESSOR_H */