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sh: Use a per-cpu ASID cache.

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Previously this was implemented using a global cache, cache
this per-CPU instead and bump up the number of context IDs to
match NR_CPUS.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2006-12-25 09:51:47 +09:00
parent 506b85f411
commit aec5e0e1c1
7 changed files with 97 additions and 93 deletions
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66
arch/sh/kernel/process.c
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@@ -1,42 +1,30 @@
/* $Id: process.c,v 1.28 2004/05/05 16:54:23 lethal Exp $
/*
* arch/sh/kernel/process.c
*
* linux/arch/sh/kernel/process.c
* This file handles the architecture-dependent parts of process handling..
*
* Copyright (C) 1995 Linus Torvalds
*
* SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
* Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC
* Copyright (C) 2002 - 2006 Paul Mundt
*/
/*
* This file handles the architecture-dependent parts of process handling..
*/
#include <linux/module.h>
#include <linux/unistd.h>
#include <linux/mm.h>
#include <linux/elfcore.h>
#include <linux/a.out.h>
#include <linux/slab.h>
#include <linux/pm.h>
#include <linux/ptrace.h>
#include <linux/kallsyms.h>
#include <linux/kexec.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/mmu_context.h>
#include <asm/elf.h>
#include <asm/ubc.h>
static int hlt_counter=0;
static int hlt_counter;
int ubc_usercnt = 0;
#define HARD_IDLE_TIMEOUT (HZ / 3)
void (*pm_idle)(void);
void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);
@@ -44,14 +32,12 @@ void disable_hlt(void)
{
hlt_counter++;
}
EXPORT_SYMBOL(disable_hlt);
void enable_hlt(void)
{
hlt_counter--;
}
EXPORT_SYMBOL(enable_hlt);
void default_idle(void)
@@ -152,19 +138,21 @@ __asm__(".align 5\n"
".align 2\n\t"
"1:.long do_exit");
/* Don't use this in BL=1(cli). Or else, CPU resets! */
int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
{ /* Don't use this in BL=1(cli). Or else, CPU resets! */
{
struct pt_regs regs;
memset(&regs, 0, sizeof(regs));
regs.regs[4] = (unsigned long) arg;
regs.regs[5] = (unsigned long) fn;
regs.regs[4] = (unsigned long)arg;
regs.regs[5] = (unsigned long)fn;
regs.pc = (unsigned long) kernel_thread_helper;
regs.pc = (unsigned long)kernel_thread_helper;
regs.sr = (1 << 30);
/* Ok, create the new process.. */
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
&regs, 0, NULL, NULL);
}
/*
@@ -211,21 +199,20 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
return fpvalid;
}
/*
/*
* Capture the user space registers if the task is not running (in user space)
*/
int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs)
{
struct pt_regs ptregs;
ptregs = *task_pt_regs(tsk);
elf_core_copy_regs(regs, &ptregs);
return 1;
}
int
dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *fpu)
int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpu)
{
int fpvalid = 0;
@@ -263,12 +250,14 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
childregs->regs[15] = usp;
ti->addr_limit = USER_DS;
} else {
childregs->regs[15] = (unsigned long)task_stack_page(p) + THREAD_SIZE;
childregs->regs[15] = (unsigned long)task_stack_page(p) +
THREAD_SIZE;
ti->addr_limit = KERNEL_DS;
}
if (clone_flags & CLONE_SETTLS) {
if (clone_flags & CLONE_SETTLS)
childregs->gbr = childregs->regs[0];
}
childregs->regs[0] = 0; /* Set return value for child */
p->thread.sp = (unsigned long) childregs;
@@ -280,8 +269,7 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
}
/* Tracing by user break controller. */
static void
ubc_set_tracing(int asid, unsigned long pc)
static void ubc_set_tracing(int asid, unsigned long pc)
{
#if defined(CONFIG_CPU_SH4A)
unsigned long val;
@@ -297,7 +285,7 @@ ubc_set_tracing(int asid, unsigned long pc)
val = (UBC_CRR_RES | UBC_CRR_PCB | UBC_CRR_BIE);
ctrl_outl(val, UBC_CRR0);
/* Read UBC register that we writed last. For chekking UBC Register changed */
/* Read UBC register that we wrote last, for checking update */
val = ctrl_inl(UBC_CRR0);
#else /* CONFIG_CPU_SH4A */
@@ -325,7 +313,8 @@ ubc_set_tracing(int asid, unsigned long pc)
* switch_to(x,y) should switch tasks from x to y.
*
*/
struct task_struct *__switch_to(struct task_struct *prev, struct task_struct *next)
struct task_struct *__switch_to(struct task_struct *prev,
struct task_struct *next)
{
#if defined(CONFIG_SH_FPU)
unlazy_fpu(prev, task_pt_regs(prev));
@@ -354,7 +343,7 @@ struct task_struct *__switch_to(struct task_struct *prev, struct task_struct *ne
#ifdef CONFIG_MMU
/*
* Restore the kernel mode register
* k7 (r7_bank1)
* k7 (r7_bank1)
*/
asm volatile("ldc %0, r7_bank"
: /* no output */
@@ -367,7 +356,7 @@ struct task_struct *__switch_to(struct task_struct *prev, struct task_struct *ne
else if (next->thread.ubc_pc && next->mm) {
int asid = 0;
#ifdef CONFIG_MMU
asid |= next->mm->context.id & MMU_CONTEXT_ASID_MASK;
asid |= cpu_asid(smp_processor_id(), next->mm);
#endif
ubc_set_tracing(asid, next->thread.ubc_pc);
} else {
@@ -405,7 +394,8 @@ asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
if (!newsp)
newsp = regs->regs[15];
return do_fork(clone_flags, newsp, regs, 0,
(int __user *)parent_tidptr, (int __user *)child_tidptr);
(int __user *)parent_tidptr,
(int __user *)child_tidptr);
}
/*