diff options
| author | Ralf Baechle <ralf@linux-mips.org> | 1998-04-05 11:23:36 +0000 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 1998-04-05 11:23:36 +0000 |
| commit | 4318fbda2a7ee51caafdc4eb1f8028a3f0605142 (patch) | |
| tree | cddb50a81d7d1a628cc400519162080c6d87868e /arch/mips/kernel/process.c | |
| parent | 36ea5120664550fae6d31f1c6f695e4f8975cb06 (diff) | |
o Merge with Linux 2.1.91.
o First round of bugfixes for the SC/MC CPUs.
o FPU context switch fixes.
o Lazy context switches.
o Faster syscalls.
o Removed dead code.
o Shitloads of other things I forgot ...
Diffstat (limited to 'arch/mips/kernel/process.c')
| -rw-r--r-- | arch/mips/kernel/process.c | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index 45d58730c..64c8cff16 100644 --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -7,7 +7,7 @@ * * Copyright (C) 1994 - 1998 by Ralf Baechle and others. * - * $Id: process.c,v 1.7 1998/03/22 20:43:43 ralf Exp $ + * $Id: process.c,v 1.7 1998/03/27 04:47:55 ralf Exp $ */ #include <linux/config.h> #include <linux/errno.h> @@ -51,10 +51,22 @@ void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp) void exit_thread(void) { + /* Forget lazy fpu state */ + if (last_task_used_math == current) { + set_cp0_status(ST0_CU1, ST0_CU1); + __asm__ __volatile__("cfc1\t$0,$31"); + last_task_used_math = NULL; + } } void flush_thread(void) { + /* Forget lazy fpu state */ + if (last_task_used_math == current) { + set_cp0_status(ST0_CU1, ST0_CU1); + __asm__ __volatile__("cfc1\t$0,$31"); + last_task_used_math = NULL; + } } void release_thread(struct task_struct *dead_task) @@ -69,6 +81,10 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, childksp = (unsigned long)p + KERNEL_STACK_SIZE - 32; + if (last_task_used_math == current) { + set_cp0_status(ST0_CU1, ST0_CU1); + r4xx0_save_fp(p); + } /* set up new TSS. */ childregs = (struct pt_regs *) childksp - 1; *childregs = *regs; @@ -84,14 +100,13 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, regs->regs[3] = 0; } if (childregs->cp0_status & ST0_CU0) { - childregs->regs[28] = p; + childregs->regs[28] = (unsigned long) p; childregs->regs[29] = childksp; p->tss.current_ds = KERNEL_DS; } else { childregs->regs[29] = usp; p->tss.current_ds = USER_DS; } - p->tss.ksp = childksp; p->tss.reg29 = (unsigned long) childregs; p->tss.reg31 = (unsigned long) ret_from_sys_call; @@ -100,7 +115,7 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, * switching for most programs since they don't use the fpu. */ p->tss.cp0_status = read_32bit_cp0_register(CP0_STATUS) & - ~(ST0_CU3|ST0_CU2|ST0_CU1|ST0_KSU|ST0_ERL|ST0_EXL); + ~(ST0_CU3|ST0_CU2|ST0_CU1|ST0_KSU); childregs->cp0_status &= ~(ST0_CU3|ST0_CU2|ST0_CU1); p->mm->context = 0; |