diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/hexagon/kernel/vm_switch.S')
| -rw-r--r-- | ANDROID_3.4.5/arch/hexagon/kernel/vm_switch.S | 95 |
1 files changed, 0 insertions, 95 deletions
diff --git a/ANDROID_3.4.5/arch/hexagon/kernel/vm_switch.S b/ANDROID_3.4.5/arch/hexagon/kernel/vm_switch.S deleted file mode 100644 index 0decf2f5..00000000 --- a/ANDROID_3.4.5/arch/hexagon/kernel/vm_switch.S +++ /dev/null @@ -1,95 +0,0 @@ -/* - * Context switch support for Hexagon - * - * Copyright (c) 2010-2011, Code Aurora Forum. 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 version 2 and - * only version 2 as published by the Free Software Foundation. - * - * 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. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - */ - -#include <asm/asm-offsets.h> - -.text - -/* - * The register used as a fast-path thread information pointer - * is determined as a kernel configuration option. If it happens - * to be a callee-save register, we're going to be saving and - * restoring it twice here. - * - * This code anticipates a revised ABI where R20-23 are added - * to the set of callee-save registers, but this should be - * backward compatible to legacy tools. - */ - - -/* - * void switch_to(struct task_struct *prev, - * struct task_struct *next, struct task_struct *last); - */ - .p2align 2 - .globl __switch_to - .type __switch_to, @function - -/* - * When we exit the wormhole, we need to store the previous task - * in the new R0's pointer. Technically it should be R2, but they should - * be the same; seems like a legacy thing. In short, don't butcher - * R0, let it go back out unmolested. - */ - -__switch_to: - /* - * Push callee-saves onto "prev" stack. - * Here, we're sneaky because the LR and FP - * storage of the thread_stack structure - * is automagically allocated by allocframe, - * so we pass struct size less 8. - */ - allocframe(#(_SWITCH_STACK_SIZE - 8)); - memd(R29+#(_SWITCH_R2726))=R27:26; - memd(R29+#(_SWITCH_R2524))=R25:24; - memd(R29+#(_SWITCH_R2322))=R23:22; - memd(R29+#(_SWITCH_R2120))=R21:20; - memd(R29+#(_SWITCH_R1918))=R19:18; - memd(R29+#(_SWITCH_R1716))=R17:16; - /* Stash thread_info pointer in task_struct */ - memw(R0+#_TASK_THREAD_INFO) = THREADINFO_REG; - memw(R0 +#(_TASK_STRUCT_THREAD + _THREAD_STRUCT_SWITCH_SP)) = R29; - /* Switch to "next" stack and restore callee saves from there */ - R29 = memw(R1 + #(_TASK_STRUCT_THREAD + _THREAD_STRUCT_SWITCH_SP)); - { - R27:26 = memd(R29+#(_SWITCH_R2726)); - R25:24 = memd(R29+#(_SWITCH_R2524)); - } - { - R23:22 = memd(R29+#(_SWITCH_R2322)); - R21:20 = memd(R29+#(_SWITCH_R2120)); - } - { - R19:18 = memd(R29+#(_SWITCH_R1918)); - R17:16 = memd(R29+#(_SWITCH_R1716)); - } - { - /* THREADINFO_REG is currently one of the callee-saved regs - * above, and so be sure to re-load it last. - */ - THREADINFO_REG = memw(R1 + #_TASK_THREAD_INFO); - R31:30 = memd(R29+#_SWITCH_FP); - } - { - R29 = add(R29,#_SWITCH_STACK_SIZE); - jumpr R31; - } - .size __switch_to, .-__switch_to |