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- /*
- * 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)
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