| /* |
| * Copyright 2011 Tilera Corporation. 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 |
| * as published by the Free Software Foundation, version 2. |
| * |
| * 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, GOOD TITLE or |
| * NON INFRINGEMENT. See the GNU General Public License for |
| * more details. |
| * |
| * This routine is a helper for migrating the home of a set of pages to |
| * a new cpu. See the documentation in homecache.c for more information. |
| */ |
| |
| #include <linux/linkage.h> |
| #include <linux/threads.h> |
| #include <asm/page.h> |
| #include <asm/thread_info.h> |
| #include <asm/types.h> |
| #include <asm/asm-offsets.h> |
| #include <hv/hypervisor.h> |
| |
| .text |
| |
| /* |
| * First, some definitions that apply to all the code in the file. |
| */ |
| |
| /* Locals (caller-save) */ |
| #define r_tmp r10 |
| #define r_save_sp r11 |
| |
| /* What we save where in the stack frame; must include all callee-saves. */ |
| #define FRAME_SP 8 |
| #define FRAME_R30 16 |
| #define FRAME_R31 24 |
| #define FRAME_R32 32 |
| #define FRAME_SIZE 40 |
| |
| |
| |
| |
| /* |
| * On entry: |
| * |
| * r0 the new context PA to install (moved to r_context) |
| * r1 PTE to use for context access (moved to r_access) |
| * r2 ASID to use for new context (moved to r_asid) |
| * r3 pointer to cpumask with just this cpu set in it (r_my_cpumask) |
| */ |
| |
| /* Arguments (caller-save) */ |
| #define r_context_in r0 |
| #define r_access_in r1 |
| #define r_asid_in r2 |
| #define r_my_cpumask r3 |
| |
| /* Locals (callee-save); must not be more than FRAME_xxx above. */ |
| #define r_context r30 |
| #define r_access r31 |
| #define r_asid r32 |
| |
| /* |
| * Caller-save locals and frame constants are the same as |
| * for homecache_migrate_stack_and_flush. |
| */ |
| |
| STD_ENTRY(flush_and_install_context) |
| /* |
| * Create a stack frame; we can't touch it once we flush the |
| * cache until we install the new page table and flush the TLB. |
| */ |
| { |
| move r_save_sp, sp |
| st sp, lr |
| addi sp, sp, -FRAME_SIZE |
| } |
| addi r_tmp, sp, FRAME_SP |
| { |
| st r_tmp, r_save_sp |
| addi r_tmp, sp, FRAME_R30 |
| } |
| { |
| st r_tmp, r30 |
| addi r_tmp, sp, FRAME_R31 |
| } |
| { |
| st r_tmp, r31 |
| addi r_tmp, sp, FRAME_R32 |
| } |
| st r_tmp, r32 |
| |
| /* Move some arguments to callee-save registers. */ |
| { |
| move r_context, r_context_in |
| move r_access, r_access_in |
| } |
| move r_asid, r_asid_in |
| |
| /* First, flush our L2 cache. */ |
| { |
| move r0, zero /* cache_pa */ |
| moveli r1, hw2_last(HV_FLUSH_EVICT_L2) /* cache_control */ |
| } |
| { |
| shl16insli r1, r1, hw1(HV_FLUSH_EVICT_L2) |
| move r2, r_my_cpumask /* cache_cpumask */ |
| } |
| { |
| shl16insli r1, r1, hw0(HV_FLUSH_EVICT_L2) |
| move r3, zero /* tlb_va */ |
| } |
| { |
| move r4, zero /* tlb_length */ |
| move r5, zero /* tlb_pgsize */ |
| } |
| { |
| move r6, zero /* tlb_cpumask */ |
| move r7, zero /* asids */ |
| } |
| { |
| move r8, zero /* asidcount */ |
| jal _hv_flush_remote |
| } |
| bnez r0, 1f |
| |
| /* Now install the new page table. */ |
| { |
| move r0, r_context |
| move r1, r_access |
| } |
| { |
| move r2, r_asid |
| moveli r3, HV_CTX_DIRECTIO | CTX_PAGE_FLAG |
| } |
| jal _hv_install_context |
| bnez r0, 1f |
| |
| /* Finally, flush the TLB. */ |
| { |
| movei r0, 0 /* preserve_global */ |
| jal hv_flush_all |
| } |
| |
| 1: /* Restore the callee-saved registers and return. */ |
| addli lr, sp, FRAME_SIZE |
| { |
| ld lr, lr |
| addli r_tmp, sp, FRAME_R30 |
| } |
| { |
| ld r30, r_tmp |
| addli r_tmp, sp, FRAME_R31 |
| } |
| { |
| ld r31, r_tmp |
| addli r_tmp, sp, FRAME_R32 |
| } |
| { |
| ld r32, r_tmp |
| addi sp, sp, FRAME_SIZE |
| } |
| jrp lr |
| STD_ENDPROC(flush_and_install_context) |
