projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b81947c6 DH |
1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public | |
| 3 | * License. See the file "COPYING" in the main directory of this archive | |
| 4 | * for more details. | |
| 5 | * | |
| 6 | * Copyright (C) 1994, 95, 96, 97, 98, 99, 2003, 06 by Ralf Baechle | |
| 7 | * Copyright (C) 1996 by Paul M. Antoine | |
| 8 | * Copyright (C) 1999 Silicon Graphics | |
| 9 | * Kevin D. Kissell, kevink@mips.org and Carsten Langgaard, carstenl@mips.com | |
| 10 | * Copyright (C) 2000 MIPS Technologies, Inc. | |
| 11 | */ | |
| 12 | #ifndef _ASM_SWITCH_TO_H | |
| 13 | #define _ASM_SWITCH_TO_H | |
| 14 | ||
| 15 | #include <asm/cpu-features.h> | |
| 16 | #include <asm/watch.h> | |
| 17 | #include <asm/dsp.h> | |
| 18 | ||
| 19 | struct task_struct; | |
| 20 | ||
| 21 | /* | |
| 22 | * switch_to(n) should switch tasks to task nr n, first | |
| 23 | * checking that n isn't the current task, in which case it does nothing. | |
| 24 | */ | |
| 2dd17030 | 25 | extern asmlinkage void *resume(void *last, void *next, void *next_ti, u32 __usedfpu); |
| b81947c6 DH |
26 | |
| 27 | extern unsigned int ll_bit; | |
| 28 | extern struct task_struct *ll_task; | |
| 29 | ||
| 30 | #ifdef CONFIG_MIPS_MT_FPAFF | |
| 31 | ||
| 32 | /* | |
| 33 | * Handle the scheduler resume end of FPU affinity management. We do this | |
| 34 | * inline to try to keep the overhead down. If we have been forced to run on | |
| 35 | * a "CPU" with an FPU because of a previous high level of FP computation, | |
| 36 | * but did not actually use the FPU during the most recent time-slice (CU1 | |
| 37 | * isn't set), we undo the restriction on cpus_allowed. | |
| 38 | * | |
| 39 | * We're not calling set_cpus_allowed() here, because we have no need to | |
| 40 | * force prompt migration - we're already switching the current CPU to a | |
| 41 | * different thread. | |
| 42 | */ | |
| 43 | ||
| 44 | #define __mips_mt_fpaff_switch_to(prev) \ | |
| 45 | do { \ | |
| 46 | struct thread_info *__prev_ti = task_thread_info(prev); \ | |
| 47 | \ | |
| 48 | if (cpu_has_fpu && \ | |
| 49 | test_ti_thread_flag(__prev_ti, TIF_FPUBOUND) && \ | |
| 50 | (!(KSTK_STATUS(prev) & ST0_CU1))) { \ | |
| 51 | clear_ti_thread_flag(__prev_ti, TIF_FPUBOUND); \ | |
| 52 | prev->cpus_allowed = prev->thread.user_cpus_allowed; \ | |
| 53 | } \ | |
| 54 | next->thread.emulated_fp = 0; \ | |
| 55 | } while(0) | |
| 56 | ||
| 57 | #else | |
| 58 | #define __mips_mt_fpaff_switch_to(prev) do { (void) (prev); } while (0) | |
| 59 | #endif | |
| 60 | ||
| 61 | #define __clear_software_ll_bit() \ | |
| 62 | do { \ | |
| 63 | if (!__builtin_constant_p(cpu_has_llsc) || !cpu_has_llsc) \ | |
| 64 | ll_bit = 0; \ | |
| 65 | } while (0) | |
| 66 | ||
| 67 | #define switch_to(prev, next, last) \ | |
| 68 | do { \ | |
| 2dd17030 | 69 | u32 __usedfpu; \ |
| b81947c6 DH |
70 | __mips_mt_fpaff_switch_to(prev); \ |
| 71 | if (cpu_has_dsp) \ | |
| 72 | __save_dsp(prev); \ | |
| 73 | __clear_software_ll_bit(); \ | |
| 2dd17030 LY |
74 | __usedfpu = test_and_clear_tsk_thread_flag(prev, TIF_USEDFPU); \ |
| 75 | (last) = resume(prev, next, task_thread_info(next), __usedfpu); \ | |
| b81947c6 DH |
76 | } while (0) |
| 77 | ||
| 78 | #define finish_arch_switch(prev) \ | |
| 79 | do { \ | |
| 80 | if (cpu_has_dsp) \ | |
| 81 | __restore_dsp(current); \ | |
| 82 | if (cpu_has_userlocal) \ | |
| 83 | write_c0_userlocal(current_thread_info()->tp_value); \ | |
| 84 | __restore_watch(); \ | |
| 85 | } while (0) | |
| 86 | ||
| 87 | #endif /* _ASM_SWITCH_TO_H */ |