linux/arch/tile/include/asm/processor.h
Suresh Siddha 55ccf3fe3f fork: move the real prepare_to_copy() users to arch_dup_task_struct()
Historical prepare_to_copy() is mostly a no-op, duplicated for majority of
the architectures and the rest following the x86 model of flushing the extended
register state like fpu there.

Remove it and use the arch_dup_task_struct() instead.

Suggested-by: Oleg Nesterov <oleg@redhat.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Link: http://lkml.kernel.org/r/1336692811-30576-1-git-send-email-suresh.b.siddha@intel.com
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Chris Zankel <chris@zankel.net>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Mark Salter <msalter@redhat.com>
Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: James E.J. Bottomley <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Chen Liqin <liqin.chen@sunplusct.com>
Cc: Lennox Wu <lennox.wu@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2012-05-16 15:16:26 -07:00

355 lines
10 KiB
C

/*
* Copyright 2010 Tilera Corporation. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*/
#ifndef _ASM_TILE_PROCESSOR_H
#define _ASM_TILE_PROCESSOR_H
#ifndef __ASSEMBLY__
/*
* NOTE: we don't include <linux/ptrace.h> or <linux/percpu.h> as one
* normally would, due to #include dependencies.
*/
#include <linux/types.h>
#include <asm/ptrace.h>
#include <asm/percpu.h>
#include <arch/chip.h>
#include <arch/spr_def.h>
struct task_struct;
struct thread_struct;
typedef struct {
unsigned long seg;
} mm_segment_t;
/*
* Default implementation of macro that returns current
* instruction pointer ("program counter").
*/
void *current_text_addr(void);
#if CHIP_HAS_TILE_DMA()
/* Capture the state of a suspended DMA. */
struct tile_dma_state {
int enabled;
unsigned long src;
unsigned long dest;
unsigned long strides;
unsigned long chunk_size;
unsigned long src_chunk;
unsigned long dest_chunk;
unsigned long byte;
unsigned long status;
};
/*
* A mask of the DMA status register for selecting only the 'running'
* and 'done' bits.
*/
#define DMA_STATUS_MASK \
(SPR_DMA_STATUS__RUNNING_MASK | SPR_DMA_STATUS__DONE_MASK)
#endif
/*
* Track asynchronous TLB events (faults and access violations)
* that occur while we are in kernel mode from DMA or the SN processor.
*/
struct async_tlb {
short fault_num; /* original fault number; 0 if none */
char is_fault; /* was it a fault (vs an access violation) */
char is_write; /* for fault: was it caused by a write? */
unsigned long address; /* what address faulted? */
};
#ifdef CONFIG_HARDWALL
struct hardwall_info;
#endif
struct thread_struct {
/* kernel stack pointer */
unsigned long ksp;
/* kernel PC */
unsigned long pc;
/* starting user stack pointer (for page migration) */
unsigned long usp0;
/* pid of process that created this one */
pid_t creator_pid;
#if CHIP_HAS_TILE_DMA()
/* DMA info for suspended threads (byte == 0 means no DMA state) */
struct tile_dma_state tile_dma_state;
#endif
/* User EX_CONTEXT registers */
unsigned long ex_context[2];
/* User SYSTEM_SAVE registers */
unsigned long system_save[4];
/* User interrupt mask */
unsigned long long interrupt_mask;
/* User interrupt-control 0 state */
unsigned long intctrl_0;
#if CHIP_HAS_PROC_STATUS_SPR()
/* Any other miscellaneous processor state bits */
unsigned long proc_status;
#endif
#if !CHIP_HAS_FIXED_INTVEC_BASE()
/* Interrupt base for PL0 interrupts */
unsigned long interrupt_vector_base;
#endif
#if CHIP_HAS_TILE_RTF_HWM()
/* Tile cache retry fifo high-water mark */
unsigned long tile_rtf_hwm;
#endif
#if CHIP_HAS_DSTREAM_PF()
/* Data stream prefetch control */
unsigned long dstream_pf;
#endif
#ifdef CONFIG_HARDWALL
/* Is this task tied to an activated hardwall? */
struct hardwall_info *hardwall;
/* Chains this task into the list at hardwall->list. */
struct list_head hardwall_list;
#endif
#if CHIP_HAS_TILE_DMA()
/* Async DMA TLB fault information */
struct async_tlb dma_async_tlb;
#endif
#if CHIP_HAS_SN_PROC()
/* Was static network processor when we were switched out? */
int sn_proc_running;
/* Async SNI TLB fault information */
struct async_tlb sn_async_tlb;
#endif
};
#endif /* !__ASSEMBLY__ */
/*
* Start with "sp" this many bytes below the top of the kernel stack.
* This preserves the invariant that a called function may write to *sp.
*/
#define STACK_TOP_DELTA 8
/*
* When entering the kernel via a fault, start with the top of the
* pt_regs structure this many bytes below the top of the page.
* This aligns the pt_regs structure optimally for cache-line access.
*/
#ifdef __tilegx__
#define KSTK_PTREGS_GAP 48
#else
#define KSTK_PTREGS_GAP 56
#endif
#ifndef __ASSEMBLY__
#ifdef __tilegx__
#define TASK_SIZE_MAX (MEM_LOW_END + 1)
#else
#define TASK_SIZE_MAX PAGE_OFFSET
#endif
/* TASK_SIZE and related variables are always checked in "current" context. */
#ifdef CONFIG_COMPAT
#define COMPAT_TASK_SIZE (1UL << 31)
#define TASK_SIZE ((current_thread_info()->status & TS_COMPAT) ?\
COMPAT_TASK_SIZE : TASK_SIZE_MAX)
#else
#define TASK_SIZE TASK_SIZE_MAX
#endif
/* We provide a minimal "vdso" a la x86; just the sigreturn code for now. */
#define VDSO_BASE (TASK_SIZE - PAGE_SIZE)
#define STACK_TOP VDSO_BASE
/* STACK_TOP_MAX is used temporarily in execve and should not check COMPAT. */
#define STACK_TOP_MAX TASK_SIZE_MAX
/*
* This decides where the kernel will search for a free chunk of vm
* space during mmap's, if it is using bottom-up mapping.
*/
#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
#define HAVE_ARCH_PICK_MMAP_LAYOUT
#define INIT_THREAD { \
.ksp = (unsigned long)init_stack + THREAD_SIZE - STACK_TOP_DELTA, \
.interrupt_mask = -1ULL \
}
/* Kernel stack top for the task that first boots on this cpu. */
DECLARE_PER_CPU(unsigned long, boot_sp);
/* PC to boot from on this cpu. */
DECLARE_PER_CPU(unsigned long, boot_pc);
/* Do necessary setup to start up a newly executed thread. */
static inline void start_thread(struct pt_regs *regs,
unsigned long pc, unsigned long usp)
{
regs->pc = pc;
regs->sp = usp;
}
/* Free all resources held by a thread. */
static inline void release_thread(struct task_struct *dead_task)
{
/* Nothing for now */
}
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
extern int do_work_pending(struct pt_regs *regs, u32 flags);
/*
* Return saved (kernel) PC of a blocked thread.
* Only used in a printk() in kernel/sched.c, so don't work too hard.
*/
#define thread_saved_pc(t) ((t)->thread.pc)
unsigned long get_wchan(struct task_struct *p);
/* Return initial ksp value for given task. */
#define task_ksp0(task) ((unsigned long)(task)->stack + THREAD_SIZE)
/* Return some info about the user process TASK. */
#define KSTK_TOP(task) (task_ksp0(task) - STACK_TOP_DELTA)
#define task_pt_regs(task) \
((struct pt_regs *)(task_ksp0(task) - KSTK_PTREGS_GAP) - 1)
#define task_sp(task) (task_pt_regs(task)->sp)
#define task_pc(task) (task_pt_regs(task)->pc)
/* Aliases for pc and sp (used in fs/proc/array.c) */
#define KSTK_EIP(task) task_pc(task)
#define KSTK_ESP(task) task_sp(task)
/* Standard format for printing registers and other word-size data. */
#ifdef __tilegx__
# define REGFMT "0x%016lx"
#else
# define REGFMT "0x%08lx"
#endif
/*
* Do some slow action (e.g. read a slow SPR).
* Note that this must also have compiler-barrier semantics since
* it may be used in a busy loop reading memory.
*/
static inline void cpu_relax(void)
{
__insn_mfspr(SPR_PASS);
barrier();
}
/* Info on this processor (see fs/proc/cpuinfo.c) */
struct seq_operations;
extern const struct seq_operations cpuinfo_op;
/* Provide information about the chip model. */
extern char chip_model[64];
/* Data on which physical memory controller corresponds to which NUMA node. */
extern int node_controller[];
#if CHIP_HAS_CBOX_HOME_MAP()
/* Does the heap allocator return hash-for-home pages by default? */
extern int hash_default;
/* Should kernel stack pages be hash-for-home? */
extern int kstack_hash;
/* Does MAP_ANONYMOUS return hash-for-home pages by default? */
#define uheap_hash hash_default
#else
#define hash_default 0
#define kstack_hash 0
#define uheap_hash 0
#endif
/* Are we using huge pages in the TLB for kernel data? */
extern int kdata_huge;
/* Support standard Linux prefetching. */
#define ARCH_HAS_PREFETCH
#define prefetch(x) __builtin_prefetch(x)
#define PREFETCH_STRIDE CHIP_L2_LINE_SIZE()
/* Bring a value into the L1D, faulting the TLB if necessary. */
#ifdef __tilegx__
#define prefetch_L1(x) __insn_prefetch_l1_fault((void *)(x))
#else
#define prefetch_L1(x) __insn_prefetch_L1((void *)(x))
#endif
#else /* __ASSEMBLY__ */
/* Do some slow action (e.g. read a slow SPR). */
#define CPU_RELAX mfspr zero, SPR_PASS
#endif /* !__ASSEMBLY__ */
/* Assembly code assumes that the PL is in the low bits. */
#if SPR_EX_CONTEXT_1_1__PL_SHIFT != 0
# error Fix assembly assumptions about PL
#endif
/* We sometimes use these macros for EX_CONTEXT_0_1 as well. */
#if SPR_EX_CONTEXT_1_1__PL_SHIFT != SPR_EX_CONTEXT_0_1__PL_SHIFT || \
SPR_EX_CONTEXT_1_1__PL_RMASK != SPR_EX_CONTEXT_0_1__PL_RMASK || \
SPR_EX_CONTEXT_1_1__ICS_SHIFT != SPR_EX_CONTEXT_0_1__ICS_SHIFT || \
SPR_EX_CONTEXT_1_1__ICS_RMASK != SPR_EX_CONTEXT_0_1__ICS_RMASK
# error Fix assumptions that EX1 macros work for both PL0 and PL1
#endif
/* Allow pulling apart and recombining the PL and ICS bits in EX_CONTEXT. */
#define EX1_PL(ex1) \
(((ex1) >> SPR_EX_CONTEXT_1_1__PL_SHIFT) & SPR_EX_CONTEXT_1_1__PL_RMASK)
#define EX1_ICS(ex1) \
(((ex1) >> SPR_EX_CONTEXT_1_1__ICS_SHIFT) & SPR_EX_CONTEXT_1_1__ICS_RMASK)
#define PL_ICS_EX1(pl, ics) \
(((pl) << SPR_EX_CONTEXT_1_1__PL_SHIFT) | \
((ics) << SPR_EX_CONTEXT_1_1__ICS_SHIFT))
/*
* Provide symbolic constants for PLs.
* Note that assembly code assumes that USER_PL is zero.
*/
#define USER_PL 0
#if CONFIG_KERNEL_PL == 2
#define GUEST_PL 1
#endif
#define KERNEL_PL CONFIG_KERNEL_PL
/* SYSTEM_SAVE_K_0 holds the current cpu number ORed with ksp0. */
#define CPU_LOG_MASK_VALUE 12
#define CPU_MASK_VALUE ((1 << CPU_LOG_MASK_VALUE) - 1)
#if CONFIG_NR_CPUS > CPU_MASK_VALUE
# error Too many cpus!
#endif
#define raw_smp_processor_id() \
((int)__insn_mfspr(SPR_SYSTEM_SAVE_K_0) & CPU_MASK_VALUE)
#define get_current_ksp0() \
(__insn_mfspr(SPR_SYSTEM_SAVE_K_0) & ~CPU_MASK_VALUE)
#define next_current_ksp0(task) ({ \
unsigned long __ksp0 = task_ksp0(task); \
int __cpu = raw_smp_processor_id(); \
BUG_ON(__ksp0 & CPU_MASK_VALUE); \
__ksp0 | __cpu; \
})
#endif /* _ASM_TILE_PROCESSOR_H */