/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1994 Waldorf GMBH
* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003 Ralf Baechle
* Copyright (C) 1996 Paul M. Antoine
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*/
#ifndef _ASM_PROCESSOR_H
#define _ASM_PROCESSOR_H
#include <linux/cpumask.h>
#include <linux/threads.h>
#include <asm/cachectl.h>
#include <asm/cpu.h>
#include <asm/cpu-info.h>
#include <asm/mipsregs.h>
#include <asm/prefetch.h>
#include <asm/system.h>
/*
* Return current * instruction pointer ("program counter").
*/
#define current_text_addr() ({ __label__ _l; _l: &&_l;})
/*
* System setup and hardware flags..
*/
extern void (*cpu_wait)(void);
extern unsigned int vced_count, vcei_count;
#ifdef CONFIG_32BIT
/*
* User space process size: 2GB. This is hardcoded into a few places,
* so don't change it unless you know what you are doing.
*/
#define TASK_SIZE 0x7fff8000UL
#define STACK_TOP TASK_SIZE
/*
* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
#define TASK_UNMAPPED_BASE ((TASK_SIZE / 3) & ~(PAGE_SIZE))
#endif
#ifdef CONFIG_64BIT
/*
* User space process size: 1TB. This is hardcoded into a few places,
* so don't change it unless you know what you are doing. TASK_SIZE
* is limited to 1TB by the R4000 architecture; R10000 and better can
* support 16TB; the architectural reserve for future expansion is
* 8192EB ...
*/
#define TASK_SIZE32 0x7fff8000UL
#define TASK_SIZE 0x10000000000UL
#define STACK_TOP \
(test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)
/*
* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
#define TASK_UNMAPPED_BASE \
(test_thread_flag(TIF_32BIT_ADDR) ? \
PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3))
#define TASK_SIZE_OF(tsk) \
(test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)
#endif
#ifdef __KERNEL__
#define STACK_TOP_MAX TASK_SIZE
#endif
#define NUM_FPU_REGS 32
typedef __u64 fpureg_t;
/*
* It would be nice to add some more fields for emulator statistics, but there
* are a number of fixed offsets in offset.h and elsewhere that would have to
* be recalculated by hand. So the additional information will be private to
* the FPU emulator for now. See asm-mips/fpu_emulator.h.
*/
struct mips_fpu_struct {
fpureg_t fpr[NUM_FPU_REGS];
unsigned int fcr31;
};
#define NUM_DSP_REGS 6
typedef __u32 dspreg_t;
struct mips_dsp_state {
dspreg_t dspr[NUM_DSP_REGS];
unsigned int dspcontrol;
};
#define INIT_CPUMASK { \
{0,} \
}
struct mips3264_watch_reg_state {
/* The width of watchlo is 32 in a 32 bit kernel and 64 in a
64 bit kernel. We use unsigned long as it has the same
property. */
unsigned long watchlo[NUM_WATCH_REGS];
/* Only the mask and IRW bits from watchhi. */
u16 watchhi[NUM_WATCH_REGS];
};
union mips_watch_reg_state {
struct mips3264_watch_reg_state mips3264;
};
typedef struct {
unsigned long seg;
} mm_segment_t;
#define ARCH_MIN_TASKALIGN 8
struct mips_abi;
/*
* If you change thread_struct remember to change the #defines below too!
*/
struct thread_struct {
/* Saved main processor registers. */
unsigned long reg16;
unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
unsigned long reg29, reg30, reg31;
/* Saved cp0 stuff. */
unsigned long cp0_status;
/* Saved fpu/fpu emulator stuff. */
struct mips_fpu_struct fpu;
#ifdef CONFIG_MIPS_MT_FPAFF
/* Emulated instruction count */
unsigned long emulated_fp;
/* Saved per-thread scheduler affinity mask */
cpumask_t user_cpus_allowed;
#endif /* CONFIG_MIPS_MT_FPAFF */
/* Saved state of the DSP ASE, if available. */
struct mips_dsp_state dsp;
/* Saved watch register state, if available. */
union mips_watch_reg_state watch;
/* Other stuff associated with the thread. */
unsigned long cp0_badvaddr; /* Last user fault */
unsigned long cp0_baduaddr; /* Last kernel fault accessing USEG */
unsigned long error_code;
unsigned long trap_no;
unsigned long irix_trampoline; /* Wheee... */
unsigned long irix_oldctx;
struct mips_abi *abi;
};
#ifdef CONFIG_MIPS_MT_FPAFF
#define FPAFF_INIT \
.emulated_fp = 0, \
.user_cpus_allowed = INIT_CPUMASK,
#else
#define FPAFF_INIT
#endif /* CONFIG_MIPS_MT_FPAFF */
#define INIT_THREAD { \
/* \
* Saved main processor registers \
*/ \
.reg16 = 0, \
.reg17 = 0, \
.reg18 = 0, \
.reg19 = 0, \
.reg20 = 0, \
.reg21 = 0, \
.reg22 = 0, \
.reg23 = 0, \
.reg29 = 0, \
.reg30 = 0, \
.reg31 = 0, \
/* \
* Saved cp0 stuff \
*/ \
.cp0_status = 0, \
/* \
* Saved FPU/FPU emulator stuff \
*/ \
.fpu = { \
.fpr = {0,}, \
.fcr31 = 0, \
}, \
/* \
* FPU affinity state (null if not FPAFF) \
*/ \
FPAFF_INIT \
/* \
* Saved DSP stuff \
*/ \
.dsp = { \
.dspr = {0, }, \
.dspcontrol = 0, \
}, \
/* \
* saved watch register stuff \
*/ \
.watch = {{{0,},},}, \
/* \
* Other stuff associated with the process \
*/ \
.cp0_badvaddr = 0, \
.cp0_baduaddr = 0, \
.error_code = 0, \
.trap_no = 0, \
.irix_trampoline = 0, \
.irix_oldctx = 0, \
}
struct task_struct;
/* Free all resources held by a thread. */
#define release_thread(thread) do { } while(0)
/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while (0)
extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
extern unsigned long thread_saved_pc(struct task_struct *tsk);
/*
* Do necessary setup to start up a newly executed thread.
*/
extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
unsigned long get_wchan(struct task_struct *p);
#define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + THREAD_SIZE - 32)
#define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk) - 1)
#define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc)
#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29])
#define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status)
#define cpu_relax() barrier()
/*
* Return_address is a replacement for __builtin_return_address(count)
* which on certain architectures cannot reasonably be implemented in GCC
* (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386).
* Note that __builtin_return_address(x>=1) is forbidden because GCC
* aborts compilation on some CPUs. It's simply not possible to unwind
* some CPU's stackframes.
*
* __builtin_return_address works only for non-leaf functions. We avoid the
* overhead of a function call by forcing the compiler to save the return
* address register on the stack.
*/
#define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})
#ifdef CONFIG_CPU_HAS_PREFETCH
#define ARCH_HAS_PREFETCH
static inline void prefetch(const void *addr)
{
__asm__ __volatile__(
" .set mips4 \n"
" pref %0, (%1) \n"
" .set mips0 \n"
:
: "i" (Pref_Load), "r" (addr));
}
#endif
#endif /* _ASM_PROCESSOR_H */
