515 lines
12 KiB
C
515 lines
12 KiB
C
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/******************************************************************************
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* linux/arch/ia64/xen/paravirt_patch.c
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*
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* Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
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* VA Linux Systems Japan K.K.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/init.h>
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#include <asm/intrinsics.h>
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#include <asm/kprobes.h>
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#include <asm/paravirt.h>
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#include <asm/paravirt_patch.h>
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typedef union ia64_inst {
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struct {
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unsigned long long qp : 6;
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unsigned long long : 31;
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unsigned long long opcode : 4;
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unsigned long long reserved : 23;
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} generic;
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unsigned long long l;
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} ia64_inst_t;
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/*
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* flush_icache_range() can't be used here.
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* we are here before cpu_init() which initializes
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* ia64_i_cache_stride_shift. flush_icache_range() uses it.
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*/
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void __init_or_module
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paravirt_flush_i_cache_range(const void *instr, unsigned long size)
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{
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extern void paravirt_fc_i(const void *addr);
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unsigned long i;
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for (i = 0; i < size; i += sizeof(bundle_t))
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paravirt_fc_i(instr + i);
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}
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bundle_t* __init_or_module
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paravirt_get_bundle(unsigned long tag)
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{
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return (bundle_t *)(tag & ~3UL);
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}
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unsigned long __init_or_module
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paravirt_get_slot(unsigned long tag)
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{
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return tag & 3UL;
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}
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unsigned long __init_or_module
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paravirt_get_num_inst(unsigned long stag, unsigned long etag)
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{
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bundle_t *sbundle = paravirt_get_bundle(stag);
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unsigned long sslot = paravirt_get_slot(stag);
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bundle_t *ebundle = paravirt_get_bundle(etag);
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unsigned long eslot = paravirt_get_slot(etag);
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return (ebundle - sbundle) * 3 + eslot - sslot + 1;
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}
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unsigned long __init_or_module
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paravirt_get_next_tag(unsigned long tag)
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{
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unsigned long slot = paravirt_get_slot(tag);
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switch (slot) {
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case 0:
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case 1:
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return tag + 1;
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case 2: {
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bundle_t *bundle = paravirt_get_bundle(tag);
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return (unsigned long)(bundle + 1);
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}
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default:
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BUG();
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}
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/* NOTREACHED */
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}
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ia64_inst_t __init_or_module
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paravirt_read_slot0(const bundle_t *bundle)
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{
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ia64_inst_t inst;
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inst.l = bundle->quad0.slot0;
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return inst;
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}
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ia64_inst_t __init_or_module
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paravirt_read_slot1(const bundle_t *bundle)
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{
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ia64_inst_t inst;
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inst.l = bundle->quad0.slot1_p0 |
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((unsigned long long)bundle->quad1.slot1_p1 << 18UL);
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return inst;
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}
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ia64_inst_t __init_or_module
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paravirt_read_slot2(const bundle_t *bundle)
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{
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ia64_inst_t inst;
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inst.l = bundle->quad1.slot2;
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return inst;
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}
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ia64_inst_t __init_or_module
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paravirt_read_inst(unsigned long tag)
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{
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bundle_t *bundle = paravirt_get_bundle(tag);
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unsigned long slot = paravirt_get_slot(tag);
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switch (slot) {
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case 0:
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return paravirt_read_slot0(bundle);
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case 1:
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return paravirt_read_slot1(bundle);
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case 2:
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return paravirt_read_slot2(bundle);
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default:
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BUG();
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}
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/* NOTREACHED */
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}
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void __init_or_module
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paravirt_write_slot0(bundle_t *bundle, ia64_inst_t inst)
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{
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bundle->quad0.slot0 = inst.l;
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}
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void __init_or_module
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paravirt_write_slot1(bundle_t *bundle, ia64_inst_t inst)
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{
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bundle->quad0.slot1_p0 = inst.l;
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bundle->quad1.slot1_p1 = inst.l >> 18UL;
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}
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void __init_or_module
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paravirt_write_slot2(bundle_t *bundle, ia64_inst_t inst)
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{
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bundle->quad1.slot2 = inst.l;
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}
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void __init_or_module
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paravirt_write_inst(unsigned long tag, ia64_inst_t inst)
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{
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bundle_t *bundle = paravirt_get_bundle(tag);
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unsigned long slot = paravirt_get_slot(tag);
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switch (slot) {
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case 0:
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paravirt_write_slot0(bundle, inst);
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break;
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case 1:
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paravirt_write_slot1(bundle, inst);
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break;
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case 2:
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paravirt_write_slot2(bundle, inst);
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break;
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default:
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BUG();
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break;
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}
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paravirt_flush_i_cache_range(bundle, sizeof(*bundle));
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}
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/* for debug */
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void
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paravirt_print_bundle(const bundle_t *bundle)
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{
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const unsigned long *quad = (const unsigned long *)bundle;
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ia64_inst_t slot0 = paravirt_read_slot0(bundle);
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ia64_inst_t slot1 = paravirt_read_slot1(bundle);
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ia64_inst_t slot2 = paravirt_read_slot2(bundle);
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printk(KERN_DEBUG
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"bundle 0x%p 0x%016lx 0x%016lx\n", bundle, quad[0], quad[1]);
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printk(KERN_DEBUG
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"bundle template 0x%x\n",
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bundle->quad0.template);
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printk(KERN_DEBUG
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"slot0 0x%lx slot1_p0 0x%lx slot1_p1 0x%lx slot2 0x%lx\n",
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(unsigned long)bundle->quad0.slot0,
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(unsigned long)bundle->quad0.slot1_p0,
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(unsigned long)bundle->quad1.slot1_p1,
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(unsigned long)bundle->quad1.slot2);
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printk(KERN_DEBUG
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"slot0 0x%016llx slot1 0x%016llx slot2 0x%016llx\n",
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slot0.l, slot1.l, slot2.l);
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}
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static int noreplace_paravirt __init_or_module = 0;
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static int __init setup_noreplace_paravirt(char *str)
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{
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noreplace_paravirt = 1;
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return 1;
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}
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__setup("noreplace-paravirt", setup_noreplace_paravirt);
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#ifdef ASM_SUPPORTED
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static void __init_or_module
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fill_nop_bundle(void *sbundle, void *ebundle)
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{
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extern const char paravirt_nop_bundle[];
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extern const unsigned long paravirt_nop_bundle_size;
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void *bundle = sbundle;
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BUG_ON((((unsigned long)sbundle) % sizeof(bundle_t)) != 0);
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BUG_ON((((unsigned long)ebundle) % sizeof(bundle_t)) != 0);
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while (bundle < ebundle) {
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memcpy(bundle, paravirt_nop_bundle, paravirt_nop_bundle_size);
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bundle += paravirt_nop_bundle_size;
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}
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}
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/* helper function */
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unsigned long __init_or_module
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__paravirt_patch_apply_bundle(void *sbundle, void *ebundle, unsigned long type,
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const struct paravirt_patch_bundle_elem *elems,
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unsigned long nelems,
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const struct paravirt_patch_bundle_elem **found)
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{
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unsigned long used = 0;
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unsigned long i;
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BUG_ON((((unsigned long)sbundle) % sizeof(bundle_t)) != 0);
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BUG_ON((((unsigned long)ebundle) % sizeof(bundle_t)) != 0);
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found = NULL;
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for (i = 0; i < nelems; i++) {
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const struct paravirt_patch_bundle_elem *p = &elems[i];
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if (p->type == type) {
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unsigned long need = p->ebundle - p->sbundle;
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unsigned long room = ebundle - sbundle;
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if (found != NULL)
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*found = p;
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if (room < need) {
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/* no room to replace. skip it */
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printk(KERN_DEBUG
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"the space is too small to put "
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"bundles. type %ld need %ld room %ld\n",
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type, need, room);
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break;
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}
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used = need;
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memcpy(sbundle, p->sbundle, used);
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break;
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}
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}
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return used;
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}
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void __init_or_module
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paravirt_patch_apply_bundle(const struct paravirt_patch_site_bundle *start,
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const struct paravirt_patch_site_bundle *end)
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{
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const struct paravirt_patch_site_bundle *p;
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if (noreplace_paravirt)
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return;
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if (pv_init_ops.patch_bundle == NULL)
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return;
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for (p = start; p < end; p++) {
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unsigned long used;
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used = (*pv_init_ops.patch_bundle)(p->sbundle, p->ebundle,
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p->type);
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if (used == 0)
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continue;
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fill_nop_bundle(p->sbundle + used, p->ebundle);
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paravirt_flush_i_cache_range(p->sbundle,
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p->ebundle - p->sbundle);
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}
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ia64_sync_i();
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ia64_srlz_i();
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}
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/*
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* nop.i, nop.m, nop.f instruction are same format.
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* but nop.b has differennt format.
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* This doesn't support nop.b for now.
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*/
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static void __init_or_module
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fill_nop_inst(unsigned long stag, unsigned long etag)
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{
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extern const bundle_t paravirt_nop_mfi_inst_bundle[];
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unsigned long tag;
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const ia64_inst_t nop_inst =
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paravirt_read_slot0(paravirt_nop_mfi_inst_bundle);
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for (tag = stag; tag < etag; tag = paravirt_get_next_tag(tag))
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paravirt_write_inst(tag, nop_inst);
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}
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void __init_or_module
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paravirt_patch_apply_inst(const struct paravirt_patch_site_inst *start,
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const struct paravirt_patch_site_inst *end)
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{
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const struct paravirt_patch_site_inst *p;
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if (noreplace_paravirt)
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return;
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if (pv_init_ops.patch_inst == NULL)
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return;
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for (p = start; p < end; p++) {
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unsigned long tag;
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bundle_t *sbundle;
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bundle_t *ebundle;
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tag = (*pv_init_ops.patch_inst)(p->stag, p->etag, p->type);
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if (tag == p->stag)
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continue;
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fill_nop_inst(tag, p->etag);
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sbundle = paravirt_get_bundle(p->stag);
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ebundle = paravirt_get_bundle(p->etag) + 1;
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paravirt_flush_i_cache_range(sbundle, (ebundle - sbundle) *
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sizeof(bundle_t));
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}
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ia64_sync_i();
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ia64_srlz_i();
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}
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#endif /* ASM_SUPPOTED */
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/* brl.cond.sptk.many <target64> X3 */
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typedef union inst_x3_op {
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ia64_inst_t inst;
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struct {
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unsigned long qp: 6;
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unsigned long btyp: 3;
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unsigned long unused: 3;
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unsigned long p: 1;
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unsigned long imm20b: 20;
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unsigned long wh: 2;
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unsigned long d: 1;
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unsigned long i: 1;
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unsigned long opcode: 4;
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};
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unsigned long l;
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} inst_x3_op_t;
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typedef union inst_x3_imm {
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ia64_inst_t inst;
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struct {
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unsigned long unused: 2;
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unsigned long imm39: 39;
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};
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unsigned long l;
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} inst_x3_imm_t;
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void __init_or_module
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paravirt_patch_reloc_brl(unsigned long tag, const void *target)
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{
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|
unsigned long tag_op = paravirt_get_next_tag(tag);
|
||
|
|
unsigned long tag_imm = tag;
|
||
|
|
bundle_t *bundle = paravirt_get_bundle(tag);
|
||
|
|
|
||
|
|
ia64_inst_t inst_op = paravirt_read_inst(tag_op);
|
||
|
|
ia64_inst_t inst_imm = paravirt_read_inst(tag_imm);
|
||
|
|
|
||
|
|
inst_x3_op_t inst_x3_op = { .l = inst_op.l };
|
||
|
|
inst_x3_imm_t inst_x3_imm = { .l = inst_imm.l };
|
||
|
|
|
||
|
|
unsigned long imm60 =
|
||
|
|
((unsigned long)target - (unsigned long)bundle) >> 4;
|
||
|
|
|
||
|
|
BUG_ON(paravirt_get_slot(tag) != 1); /* MLX */
|
||
|
|
BUG_ON(((unsigned long)target & (sizeof(bundle_t) - 1)) != 0);
|
||
|
|
|
||
|
|
/* imm60[59] 1bit */
|
||
|
|
inst_x3_op.i = (imm60 >> 59) & 1;
|
||
|
|
/* imm60[19:0] 20bit */
|
||
|
|
inst_x3_op.imm20b = imm60 & ((1UL << 20) - 1);
|
||
|
|
/* imm60[58:20] 39bit */
|
||
|
|
inst_x3_imm.imm39 = (imm60 >> 20) & ((1UL << 39) - 1);
|
||
|
|
|
||
|
|
inst_op.l = inst_x3_op.l;
|
||
|
|
inst_imm.l = inst_x3_imm.l;
|
||
|
|
|
||
|
|
paravirt_write_inst(tag_op, inst_op);
|
||
|
|
paravirt_write_inst(tag_imm, inst_imm);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* br.cond.sptk.many <target25> B1 */
|
||
|
|
typedef union inst_b1 {
|
||
|
|
ia64_inst_t inst;
|
||
|
|
struct {
|
||
|
|
unsigned long qp: 6;
|
||
|
|
unsigned long btype: 3;
|
||
|
|
unsigned long unused: 3;
|
||
|
|
unsigned long p: 1;
|
||
|
|
unsigned long imm20b: 20;
|
||
|
|
unsigned long wh: 2;
|
||
|
|
unsigned long d: 1;
|
||
|
|
unsigned long s: 1;
|
||
|
|
unsigned long opcode: 4;
|
||
|
|
};
|
||
|
|
unsigned long l;
|
||
|
|
} inst_b1_t;
|
||
|
|
|
||
|
|
void __init
|
||
|
|
paravirt_patch_reloc_br(unsigned long tag, const void *target)
|
||
|
|
{
|
||
|
|
bundle_t *bundle = paravirt_get_bundle(tag);
|
||
|
|
ia64_inst_t inst = paravirt_read_inst(tag);
|
||
|
|
unsigned long target25 = (unsigned long)target - (unsigned long)bundle;
|
||
|
|
inst_b1_t inst_b1;
|
||
|
|
|
||
|
|
BUG_ON(((unsigned long)target & (sizeof(bundle_t) - 1)) != 0);
|
||
|
|
|
||
|
|
inst_b1.l = inst.l;
|
||
|
|
if (target25 & (1UL << 63))
|
||
|
|
inst_b1.s = 1;
|
||
|
|
else
|
||
|
|
inst_b1.s = 0;
|
||
|
|
|
||
|
|
inst_b1.imm20b = target25 >> 4;
|
||
|
|
inst.l = inst_b1.l;
|
||
|
|
|
||
|
|
paravirt_write_inst(tag, inst);
|
||
|
|
}
|
||
|
|
|
||
|
|
void __init
|
||
|
|
__paravirt_patch_apply_branch(
|
||
|
|
unsigned long tag, unsigned long type,
|
||
|
|
const struct paravirt_patch_branch_target *entries,
|
||
|
|
unsigned int nr_entries)
|
||
|
|
{
|
||
|
|
unsigned int i;
|
||
|
|
for (i = 0; i < nr_entries; i++) {
|
||
|
|
if (entries[i].type == type) {
|
||
|
|
paravirt_patch_reloc_br(tag, entries[i].entry);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __init
|
||
|
|
paravirt_patch_apply_branch(const struct paravirt_patch_site_branch *start,
|
||
|
|
const struct paravirt_patch_site_branch *end)
|
||
|
|
{
|
||
|
|
const struct paravirt_patch_site_branch *p;
|
||
|
|
|
||
|
|
if (noreplace_paravirt)
|
||
|
|
return;
|
||
|
|
if (pv_init_ops.patch_branch == NULL)
|
||
|
|
return;
|
||
|
|
|
||
|
|
for (p = start; p < end; p++)
|
||
|
|
(*pv_init_ops.patch_branch)(p->tag, p->type);
|
||
|
|
|
||
|
|
ia64_sync_i();
|
||
|
|
ia64_srlz_i();
|
||
|
|
}
|
||
|
|
|
||
|
|
void __init
|
||
|
|
paravirt_patch_apply(void)
|
||
|
|
{
|
||
|
|
extern const char __start_paravirt_bundles[];
|
||
|
|
extern const char __stop_paravirt_bundles[];
|
||
|
|
extern const char __start_paravirt_insts[];
|
||
|
|
extern const char __stop_paravirt_insts[];
|
||
|
|
extern const char __start_paravirt_branches[];
|
||
|
|
extern const char __stop_paravirt_branches[];
|
||
|
|
|
||
|
|
paravirt_patch_apply_bundle((const struct paravirt_patch_site_bundle *)
|
||
|
|
__start_paravirt_bundles,
|
||
|
|
(const struct paravirt_patch_site_bundle *)
|
||
|
|
__stop_paravirt_bundles);
|
||
|
|
paravirt_patch_apply_inst((const struct paravirt_patch_site_inst *)
|
||
|
|
__start_paravirt_insts,
|
||
|
|
(const struct paravirt_patch_site_inst *)
|
||
|
|
__stop_paravirt_insts);
|
||
|
|
paravirt_patch_apply_branch((const struct paravirt_patch_site_branch *)
|
||
|
|
__start_paravirt_branches,
|
||
|
|
(const struct paravirt_patch_site_branch *)
|
||
|
|
__stop_paravirt_branches);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Local variables:
|
||
|
|
* mode: C
|
||
|
|
* c-set-style: "linux"
|
||
|
|
* c-basic-offset: 8
|
||
|
|
* tab-width: 8
|
||
|
|
* indent-tabs-mode: t
|
||
|
|
* End:
|
||
|
|
*/
|