Merge branch 'wip-2.6.34' into old-private-masterarchived-private-master

1 files changed, 54 insertions, 147 deletions

diff --git a/arch/sh/kernel/process_32.c b/arch/sh/kernel/process_32.c
index 0673c4746be3..052981972ae6 100644
--- a/arch/sh/kernel/process_32.c
+++ b/arch/sh/kernel/process_32.c
@@ -15,66 +15,17 @@
  */
 #include <linux/module.h>
 #include <linux/mm.h>
+#include <linux/slab.h>
 #include <linux/elfcore.h>
-#include <linux/pm.h>
 #include <linux/kallsyms.h>
-#include <linux/kexec.h>
-#include <linux/kdebug.h>
-#include <linux/tick.h>
-#include <linux/reboot.h>
 #include <linux/fs.h>
 #include <linux/ftrace.h>
-#include <linux/preempt.h>
+#include <linux/hw_breakpoint.h>
 #include <asm/uaccess.h>
 #include <asm/mmu_context.h>
-#include <asm/pgalloc.h>
 #include <asm/system.h>
-#include <asm/ubc.h>
 #include <asm/fpu.h>
 #include <asm/syscalls.h>
-#include <asm/watchdog.h>
-
-int ubc_usercnt = 0;
-
-#ifdef CONFIG_32BIT
-static void watchdog_trigger_immediate(void)
-{
-        sh_wdt_write_cnt(0xFF);
-        sh_wdt_write_csr(0xC2);
-}
-
-void machine_restart(char * __unused)
-{
-        local_irq_disable();
-
-        /* Use watchdog timer to trigger reset */
-        watchdog_trigger_immediate();
-
-        while (1)
-                cpu_sleep();
-}
-#else
-void machine_restart(char * __unused)
-{
-        /* SR.BL=1 and invoke address error to let CPU reset (manual reset) */
-        asm volatile("ldc %0, sr\n\t"
-                     "mov.l @%1, %0" : : "r" (0x10000000), "r" (0x80000001));
-}
-#endif
-
-void machine_halt(void)
-{
-        local_irq_disable();
-
-        while (1)
-                cpu_sleep();
-}
-
-void machine_power_off(void)
-{
-        if (pm_power_off)
-                pm_power_off();
-}
 
 void show_regs(struct pt_regs * regs)
 {
@@ -91,7 +42,7 @@ void show_regs(struct pt_regs * regs)
         printk("PC  : %08lx SP  : %08lx SR  : %08lx ",
                regs->pc, regs->regs[15], regs->sr);
 #ifdef CONFIG_MMU
-        printk("TEA : %08x\n", ctrl_inl(MMU_TEA));
+        printk("TEA : %08x\n", __raw_readl(MMU_TEA));
 #else
         printk("\n");
 #endif
@@ -134,7 +85,10 @@ int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
         regs.regs[5] = (unsigned long)fn;
 
         regs.pc = (unsigned long)kernel_thread_helper;
-        regs.sr = (1 << 30);
+        regs.sr = SR_MD;
+#if defined(CONFIG_SH_FPU)
+        regs.sr |= SR_FD;
+#endif
 
         /* Ok, create the new process.. */
         pid = do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
@@ -142,22 +96,36 @@ int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
 
         return pid;
 }
+EXPORT_SYMBOL(kernel_thread);
+
+void start_thread(struct pt_regs *regs, unsigned long new_pc,
+                  unsigned long new_sp)
+{
+        set_fs(USER_DS);
+
+        regs->pr = 0;
+        regs->sr = SR_FD;
+        regs->pc = new_pc;
+        regs->regs[15] = new_sp;
+
+        free_thread_xstate(current);
+}
+EXPORT_SYMBOL(start_thread);
 
 /*
  * Free current thread data structures etc..
  */
 void exit_thread(void)
 {
-        if (current->thread.ubc_pc) {
-                current->thread.ubc_pc = 0;
-                ubc_usercnt -= 1;
-        }
 }
 
 void flush_thread(void)
 {
-#if defined(CONFIG_SH_FPU)
         struct task_struct *tsk = current;
+
+        flush_ptrace_hw_breakpoint(tsk);
+
+#if defined(CONFIG_SH_FPU)
         /* Forget lazy FPU state */
         clear_fpu(tsk, task_pt_regs(tsk));
         clear_used_math();
@@ -186,6 +154,16 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
 
         return fpvalid;
 }
+EXPORT_SYMBOL(dump_fpu);
+
+/*
+ * This gets called before we allocate a new thread and copy
+ * the current task into it.
+ */
+void prepare_to_copy(struct task_struct *tsk)
+{
+        unlazy_fpu(tsk, task_pt_regs(tsk));
+}
 
 asmlinkage void ret_from_fork(void);
 
@@ -195,17 +173,10 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 {
         struct thread_info *ti = task_thread_info(p);
         struct pt_regs *childregs;
-#if defined(CONFIG_SH_FPU) || defined(CONFIG_SH_DSP)
-        struct task_struct *tsk = current;
-#endif
-
-#if defined(CONFIG_SH_FPU)
-        unlazy_fpu(tsk, regs);
-        p->thread.fpu = tsk->thread.fpu;
-        copy_to_stopped_child_used_math(p);
-#endif
 
 #if defined(CONFIG_SH_DSP)
+        struct task_struct *tsk = current;
+
         if (is_dsp_enabled(tsk)) {
                 /* We can use the __save_dsp or just copy the struct:
                  * __save_dsp(p);
@@ -224,6 +195,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
         } else {
                 childregs->regs[15] = (unsigned long)childregs;
                 ti->addr_limit = KERNEL_DS;
+                ti->status &= ~TS_USEDFPU;
+                p->fpu_counter = 0;
         }
 
         if (clone_flags & CLONE_SETTLS)
@@ -234,53 +207,11 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
         p->thread.sp = (unsigned long) childregs;
         p->thread.pc = (unsigned long) ret_from_fork;
 
-        p->thread.ubc_pc = 0;
+        memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
 
         return 0;
 }
 
-/* Tracing by user break controller.  */
-static void ubc_set_tracing(int asid, unsigned long pc)
-{
-#if defined(CONFIG_CPU_SH4A)
-        unsigned long val;
-
-        val = (UBC_CBR_ID_INST | UBC_CBR_RW_READ | UBC_CBR_CE);
-        val |= (UBC_CBR_AIE | UBC_CBR_AIV_SET(asid));
-
-        ctrl_outl(val, UBC_CBR0);
-        ctrl_outl(pc,  UBC_CAR0);
-        ctrl_outl(0x0, UBC_CAMR0);
-        ctrl_outl(0x0, UBC_CBCR);
-
-        val = (UBC_CRR_RES | UBC_CRR_PCB | UBC_CRR_BIE);
-        ctrl_outl(val, UBC_CRR0);
-
-        /* Read UBC register that we wrote last, for checking update */
-        val = ctrl_inl(UBC_CRR0);
-
-#else   /* CONFIG_CPU_SH4A */
-        ctrl_outl(pc, UBC_BARA);
-
-#ifdef CONFIG_MMU
-        ctrl_outb(asid, UBC_BASRA);
-#endif
-
-        ctrl_outl(0, UBC_BAMRA);
-
-        if (current_cpu_data.type == CPU_SH7729 ||
-            current_cpu_data.type == CPU_SH7710 ||
-            current_cpu_data.type == CPU_SH7712 ||
-            current_cpu_data.type == CPU_SH7203){
-                ctrl_outw(BBR_INST | BBR_READ | BBR_CPU, UBC_BBRA);
-                ctrl_outl(BRCR_PCBA | BRCR_PCTE, UBC_BRCR);
-        } else {
-                ctrl_outw(BBR_INST | BBR_READ, UBC_BBRA);
-                ctrl_outw(BRCR_PCBA, UBC_BRCR);
-        }
-#endif  /* CONFIG_CPU_SH4A */
-}
-
 /*
  *      switch_to(x,y) should switch tasks from x to y.
  *
@@ -288,9 +219,13 @@ static void ubc_set_tracing(int asid, unsigned long pc)
 __notrace_funcgraph struct task_struct *
 __switch_to(struct task_struct *prev, struct task_struct *next)
 {
-#if defined(CONFIG_SH_FPU)
+        struct thread_struct *next_t = &next->thread;
+
         unlazy_fpu(prev, task_pt_regs(prev));
-#endif
+
+        /* we're going to use this soon, after a few expensive things */
+        if (next->fpu_counter > 5)
+                prefetch(next_t->xstate);
 
 #ifdef CONFIG_MMU
         /*
@@ -302,24 +237,13 @@ __switch_to(struct task_struct *prev, struct task_struct *next)
                      : "r" (task_thread_info(next)));
 #endif
 
-        /* If no tasks are using the UBC, we're done */
-        if (ubc_usercnt == 0)
-                /* If no tasks are using the UBC, we're done */;
-        else if (next->thread.ubc_pc && next->mm) {
-                int asid = 0;
-#ifdef CONFIG_MMU
-                asid |= cpu_asid(smp_processor_id(), next->mm);
-#endif
-                ubc_set_tracing(asid, next->thread.ubc_pc);
-        } else {
-#if defined(CONFIG_CPU_SH4A)
-                ctrl_outl(UBC_CBR_INIT, UBC_CBR0);
-                ctrl_outl(UBC_CRR_INIT, UBC_CRR0);
-#else
-                ctrl_outw(0, UBC_BBRA);
-                ctrl_outw(0, UBC_BBRB);
-#endif
-        }
+        /*
+         * If the task has used fpu the last 5 timeslices, just do a full
+         * restore of the math state immediately to avoid the trap; the
+         * chances of needing FPU soon are obviously high now
+         */
+        if (next->fpu_counter > 5)
+                __fpu_state_restore();
 
         return prev;
 }
@@ -412,20 +336,3 @@ unsigned long get_wchan(struct task_struct *p)
 
         return pc;
 }
-
-asmlinkage void break_point_trap(void)
-{
-        /* Clear tracing.  */
-#if defined(CONFIG_CPU_SH4A)
-        ctrl_outl(UBC_CBR_INIT, UBC_CBR0);
-        ctrl_outl(UBC_CRR_INIT, UBC_CRR0);
-#else
-        ctrl_outw(0, UBC_BBRA);
-        ctrl_outw(0, UBC_BBRB);
-        ctrl_outl(0, UBC_BRCR);
-#endif
-        current->thread.ubc_pc = 0;
-        ubc_usercnt -= 1;
-
-        force_sig(SIGTRAP, current);
-}