migrate_32.S
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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_R35 28
#define FRAME_SIZE 32
/*
* 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_save_ics r30
#define r_context_lo r31
#define r_context_hi r32
#define r_access_lo r33
#define r_access_hi r34
#define r_asid r35
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
addi r_tmp, sp, FRAME_R35
}
sw r_tmp, r35
/* 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
/* Disable interrupts, since we can't use our stack. */
{
mfspr r_save_ics, INTERRUPT_CRITICAL_SECTION
movei r_tmp, 1
}
mtspr INTERRUPT_CRITICAL_SECTION, r_tmp
/* 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
movei r5, HV_CTX_DIRECTIO
}
jal hv_install_context
bnz r0, .Ldone
/* Finally, flush the TLB. */
{
movei r0, 0 /* preserve_global */
jal hv_flush_all
}
.Ldone:
/* Reset interrupts back how they were before. */
mtspr INTERRUPT_CRITICAL_SECTION, r_save_ics
/* 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
addli r_tmp, sp, FRAME_R35
}
{
lw r35, r_tmp
addi sp, sp, FRAME_SIZE
}
jrp lr
STD_ENDPROC(flush_and_install_context)