| /* |
| * Copyright 2010 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 4 |
| #define FRAME_R30 8 |
| #define FRAME_R31 12 |
| #define FRAME_R32 16 |
| #define FRAME_R33 20 |
| #define FRAME_R34 24 |
| #define FRAME_SIZE 28 |
| |
| |
| |
| |
| /* |
| * On entry: |
| * |
| * r0 low word of the new context PA to install (moved to r_context_lo) |
| * r1 high word of the new context PA to install (moved to r_context_hi) |
| * r2 low word of PTE to use for context access (moved to r_access_lo) |
| * r3 high word of PTE to use for context access (moved to r_access_lo) |
| * r4 ASID to use for new context (moved to r_asid) |
| * r5 pointer to cpumask with just this cpu set in it (r_my_cpumask) |
| */ |
| |
| /* Arguments (caller-save) */ |
| #define r_context_lo_in r0 |
| #define r_context_hi_in r1 |
| #define r_access_lo_in r2 |
| #define r_access_hi_in r3 |
| #define r_asid_in r4 |
| #define r_my_cpumask r5 |
| |
| /* Locals (callee-save); must not be more than FRAME_xxx above. */ |
| #define r_context_lo r30 |
| #define r_context_hi r31 |
| #define r_access_lo r32 |
| #define r_access_hi r33 |
| #define r_asid r34 |
| |
| 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 |
| sw sp, lr |
| addi sp, sp, -FRAME_SIZE |
| } |
| addi r_tmp, sp, FRAME_SP |
| { |
| sw r_tmp, r_save_sp |
| addi r_tmp, sp, FRAME_R30 |
| } |
| { |
| sw r_tmp, r30 |
| addi r_tmp, sp, FRAME_R31 |
| } |
| { |
| sw r_tmp, r31 |
| addi r_tmp, sp, FRAME_R32 |
| } |
| { |
| sw r_tmp, r32 |
| addi r_tmp, sp, FRAME_R33 |
| } |
| { |
| sw r_tmp, r33 |
| addi r_tmp, sp, FRAME_R34 |
| } |
| sw r_tmp, r34 |
| |
| /* Move some arguments to callee-save registers. */ |
| { |
| move r_context_lo, r_context_lo_in |
| move r_context_hi, r_context_hi_in |
| } |
| { |
| move r_access_lo, r_access_lo_in |
| move r_access_hi, r_access_hi_in |
| } |
| move r_asid, r_asid_in |
| |
| /* First, flush our L2 cache. */ |
| { |
| move r0, zero /* cache_pa */ |
| move r1, zero |
| } |
| { |
| auli r2, zero, ha16(HV_FLUSH_EVICT_L2) /* cache_control */ |
| move r3, r_my_cpumask /* cache_cpumask */ |
| } |
| { |
| move r4, zero /* tlb_va */ |
| move r5, zero /* tlb_length */ |
| } |
| { |
| move r6, zero /* tlb_pgsize */ |
| move r7, zero /* tlb_cpumask */ |
| } |
| { |
| move r8, zero /* asids */ |
| move r9, zero /* asidcount */ |
| } |
| jal hv_flush_remote |
| bnz r0, .Ldone |
| |
| /* Now install the new page table. */ |
| { |
| move r0, r_context_lo |
| move r1, r_context_hi |
| } |
| { |
| move r2, r_access_lo |
| move r3, r_access_hi |
| } |
| { |
| move r4, r_asid |
| moveli r5, HV_CTX_DIRECTIO | CTX_PAGE_FLAG |
| } |
| jal hv_install_context |
| bnz r0, .Ldone |
| |
| /* Finally, flush the TLB. */ |
| { |
| movei r0, 0 /* preserve_global */ |
| jal hv_flush_all |
| } |
| |
| .Ldone: |
| /* Restore the callee-saved registers and return. */ |
| addli lr, sp, FRAME_SIZE |
| { |
| lw lr, lr |
| addli r_tmp, sp, FRAME_R30 |
| } |
| { |
| lw r30, r_tmp |
| addli r_tmp, sp, FRAME_R31 |
| } |
| { |
| lw r31, r_tmp |
| addli r_tmp, sp, FRAME_R32 |
| } |
| { |
| lw r32, r_tmp |
| addli r_tmp, sp, FRAME_R33 |
| } |
| { |
| lw r33, r_tmp |
| addli r_tmp, sp, FRAME_R34 |
| } |
| { |
| lw r34, r_tmp |
| addi sp, sp, FRAME_SIZE |
| } |
| jrp lr |
| STD_ENDPROC(flush_and_install_context) |