6abcd98ffa
This patch consolidates the irqflags include files containing common paravirt definitions. The native definition for interrupt handling, halt, and such, are the same for 32 and 64 bit, and they are kept in irqflags.h. the differences are split in the arch-specific files. The syscall function, irq_enable_sysexit, has a very specific i386 naming, and its name is then changed to a more general one. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Acked-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
472 lines
12 KiB
C
472 lines
12 KiB
C
/* Paravirtualization interfaces
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Copyright (C) 2006 Rusty Russell IBM Corporation
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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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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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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/efi.h>
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#include <linux/bcd.h>
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#include <linux/highmem.h>
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#include <asm/bug.h>
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#include <asm/paravirt.h>
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#include <asm/desc.h>
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#include <asm/setup.h>
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#include <asm/arch_hooks.h>
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#include <asm/time.h>
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#include <asm/irq.h>
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#include <asm/delay.h>
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#include <asm/fixmap.h>
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#include <asm/apic.h>
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#include <asm/tlbflush.h>
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#include <asm/timer.h>
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/* nop stub */
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void _paravirt_nop(void)
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{
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}
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static void __init default_banner(void)
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{
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printk(KERN_INFO "Booting paravirtualized kernel on %s\n",
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pv_info.name);
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}
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char *memory_setup(void)
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{
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return pv_init_ops.memory_setup();
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}
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/* Simple instruction patching code. */
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#define DEF_NATIVE(ops, name, code) \
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extern const char start_##ops##_##name[], end_##ops##_##name[]; \
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asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
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DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
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DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
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DEF_NATIVE(pv_irq_ops, restore_fl, "push %eax; popf");
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DEF_NATIVE(pv_irq_ops, save_fl, "pushf; pop %eax");
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DEF_NATIVE(pv_cpu_ops, iret, "iret");
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DEF_NATIVE(pv_cpu_ops, irq_enable_syscall_ret, "sti; sysexit");
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DEF_NATIVE(pv_mmu_ops, read_cr2, "mov %cr2, %eax");
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DEF_NATIVE(pv_mmu_ops, write_cr3, "mov %eax, %cr3");
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DEF_NATIVE(pv_mmu_ops, read_cr3, "mov %cr3, %eax");
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DEF_NATIVE(pv_cpu_ops, clts, "clts");
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DEF_NATIVE(pv_cpu_ops, read_tsc, "rdtsc");
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/* Undefined instruction for dealing with missing ops pointers. */
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static const unsigned char ud2a[] = { 0x0f, 0x0b };
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static unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
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unsigned long addr, unsigned len)
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{
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const unsigned char *start, *end;
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unsigned ret;
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switch(type) {
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#define SITE(ops, x) \
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case PARAVIRT_PATCH(ops.x): \
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start = start_##ops##_##x; \
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end = end_##ops##_##x; \
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goto patch_site
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SITE(pv_irq_ops, irq_disable);
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SITE(pv_irq_ops, irq_enable);
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SITE(pv_irq_ops, restore_fl);
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SITE(pv_irq_ops, save_fl);
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SITE(pv_cpu_ops, iret);
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SITE(pv_cpu_ops, irq_enable_syscall_ret);
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SITE(pv_mmu_ops, read_cr2);
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SITE(pv_mmu_ops, read_cr3);
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SITE(pv_mmu_ops, write_cr3);
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SITE(pv_cpu_ops, clts);
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SITE(pv_cpu_ops, read_tsc);
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#undef SITE
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patch_site:
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ret = paravirt_patch_insns(ibuf, len, start, end);
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break;
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default:
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ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
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break;
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}
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return ret;
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}
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unsigned paravirt_patch_nop(void)
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{
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return 0;
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}
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unsigned paravirt_patch_ignore(unsigned len)
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{
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return len;
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}
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struct branch {
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unsigned char opcode;
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u32 delta;
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} __attribute__((packed));
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unsigned paravirt_patch_call(void *insnbuf,
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const void *target, u16 tgt_clobbers,
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unsigned long addr, u16 site_clobbers,
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unsigned len)
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{
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struct branch *b = insnbuf;
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unsigned long delta = (unsigned long)target - (addr+5);
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if (tgt_clobbers & ~site_clobbers)
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return len; /* target would clobber too much for this site */
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if (len < 5)
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return len; /* call too long for patch site */
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b->opcode = 0xe8; /* call */
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b->delta = delta;
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BUILD_BUG_ON(sizeof(*b) != 5);
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return 5;
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}
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unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
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unsigned long addr, unsigned len)
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{
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struct branch *b = insnbuf;
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unsigned long delta = (unsigned long)target - (addr+5);
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if (len < 5)
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return len; /* call too long for patch site */
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b->opcode = 0xe9; /* jmp */
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b->delta = delta;
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return 5;
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}
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/* Neat trick to map patch type back to the call within the
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* corresponding structure. */
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static void *get_call_destination(u8 type)
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{
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struct paravirt_patch_template tmpl = {
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.pv_init_ops = pv_init_ops,
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.pv_time_ops = pv_time_ops,
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.pv_cpu_ops = pv_cpu_ops,
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.pv_irq_ops = pv_irq_ops,
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.pv_apic_ops = pv_apic_ops,
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.pv_mmu_ops = pv_mmu_ops,
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};
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return *((void **)&tmpl + type);
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}
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unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
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unsigned long addr, unsigned len)
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{
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void *opfunc = get_call_destination(type);
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unsigned ret;
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if (opfunc == NULL)
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/* If there's no function, patch it with a ud2a (BUG) */
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ret = paravirt_patch_insns(insnbuf, len, ud2a, ud2a+sizeof(ud2a));
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else if (opfunc == paravirt_nop)
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/* If the operation is a nop, then nop the callsite */
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ret = paravirt_patch_nop();
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else if (type == PARAVIRT_PATCH(pv_cpu_ops.iret) ||
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type == PARAVIRT_PATCH(pv_cpu_ops.irq_enable_syscall_ret))
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/* If operation requires a jmp, then jmp */
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ret = paravirt_patch_jmp(insnbuf, opfunc, addr, len);
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else
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/* Otherwise call the function; assume target could
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clobber any caller-save reg */
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ret = paravirt_patch_call(insnbuf, opfunc, CLBR_ANY,
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addr, clobbers, len);
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return ret;
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}
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unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
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const char *start, const char *end)
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{
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unsigned insn_len = end - start;
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if (insn_len > len || start == NULL)
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insn_len = len;
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else
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memcpy(insnbuf, start, insn_len);
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return insn_len;
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}
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void init_IRQ(void)
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{
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pv_irq_ops.init_IRQ();
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}
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static void native_flush_tlb(void)
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{
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__native_flush_tlb();
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}
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/*
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* Global pages have to be flushed a bit differently. Not a real
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* performance problem because this does not happen often.
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*/
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static void native_flush_tlb_global(void)
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{
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__native_flush_tlb_global();
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}
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static void native_flush_tlb_single(unsigned long addr)
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{
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__native_flush_tlb_single(addr);
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}
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/* These are in entry.S */
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extern void native_iret(void);
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extern void native_irq_enable_syscall_ret(void);
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static int __init print_banner(void)
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{
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pv_init_ops.banner();
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return 0;
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}
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core_initcall(print_banner);
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static struct resource reserve_ioports = {
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.start = 0,
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.end = IO_SPACE_LIMIT,
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.name = "paravirt-ioport",
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.flags = IORESOURCE_IO | IORESOURCE_BUSY,
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};
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static struct resource reserve_iomem = {
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.start = 0,
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.end = -1,
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.name = "paravirt-iomem",
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.flags = IORESOURCE_MEM | IORESOURCE_BUSY,
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};
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/*
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* Reserve the whole legacy IO space to prevent any legacy drivers
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* from wasting time probing for their hardware. This is a fairly
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* brute-force approach to disabling all non-virtual drivers.
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*
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* Note that this must be called very early to have any effect.
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*/
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int paravirt_disable_iospace(void)
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{
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int ret;
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ret = request_resource(&ioport_resource, &reserve_ioports);
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if (ret == 0) {
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ret = request_resource(&iomem_resource, &reserve_iomem);
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if (ret)
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release_resource(&reserve_ioports);
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}
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return ret;
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}
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static DEFINE_PER_CPU(enum paravirt_lazy_mode, paravirt_lazy_mode) = PARAVIRT_LAZY_NONE;
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static inline void enter_lazy(enum paravirt_lazy_mode mode)
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{
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BUG_ON(x86_read_percpu(paravirt_lazy_mode) != PARAVIRT_LAZY_NONE);
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BUG_ON(preemptible());
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x86_write_percpu(paravirt_lazy_mode, mode);
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}
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void paravirt_leave_lazy(enum paravirt_lazy_mode mode)
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{
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BUG_ON(x86_read_percpu(paravirt_lazy_mode) != mode);
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BUG_ON(preemptible());
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x86_write_percpu(paravirt_lazy_mode, PARAVIRT_LAZY_NONE);
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}
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void paravirt_enter_lazy_mmu(void)
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{
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enter_lazy(PARAVIRT_LAZY_MMU);
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}
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void paravirt_leave_lazy_mmu(void)
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{
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paravirt_leave_lazy(PARAVIRT_LAZY_MMU);
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}
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void paravirt_enter_lazy_cpu(void)
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{
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enter_lazy(PARAVIRT_LAZY_CPU);
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}
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void paravirt_leave_lazy_cpu(void)
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{
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paravirt_leave_lazy(PARAVIRT_LAZY_CPU);
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}
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enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
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{
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return x86_read_percpu(paravirt_lazy_mode);
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}
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struct pv_info pv_info = {
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.name = "bare hardware",
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.paravirt_enabled = 0,
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.kernel_rpl = 0,
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.shared_kernel_pmd = 1, /* Only used when CONFIG_X86_PAE is set */
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};
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struct pv_init_ops pv_init_ops = {
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.patch = native_patch,
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.banner = default_banner,
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.arch_setup = paravirt_nop,
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.memory_setup = machine_specific_memory_setup,
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};
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struct pv_time_ops pv_time_ops = {
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.time_init = hpet_time_init,
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.get_wallclock = native_get_wallclock,
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.set_wallclock = native_set_wallclock,
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.sched_clock = native_sched_clock,
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.get_cpu_khz = native_calculate_cpu_khz,
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};
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struct pv_irq_ops pv_irq_ops = {
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.init_IRQ = native_init_IRQ,
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.save_fl = native_save_fl,
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.restore_fl = native_restore_fl,
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.irq_disable = native_irq_disable,
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.irq_enable = native_irq_enable,
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.safe_halt = native_safe_halt,
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.halt = native_halt,
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};
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struct pv_cpu_ops pv_cpu_ops = {
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.cpuid = native_cpuid,
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.get_debugreg = native_get_debugreg,
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.set_debugreg = native_set_debugreg,
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.clts = native_clts,
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.read_cr0 = native_read_cr0,
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.write_cr0 = native_write_cr0,
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.read_cr4 = native_read_cr4,
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.read_cr4_safe = native_read_cr4_safe,
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.write_cr4 = native_write_cr4,
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.wbinvd = native_wbinvd,
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.read_msr = native_read_msr_safe,
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.write_msr = native_write_msr_safe,
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.read_tsc = native_read_tsc,
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.read_pmc = native_read_pmc,
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.load_tr_desc = native_load_tr_desc,
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.set_ldt = native_set_ldt,
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.load_gdt = native_load_gdt,
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.load_idt = native_load_idt,
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.store_gdt = native_store_gdt,
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.store_idt = native_store_idt,
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.store_tr = native_store_tr,
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.load_tls = native_load_tls,
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.write_ldt_entry = write_dt_entry,
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.write_gdt_entry = write_dt_entry,
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.write_idt_entry = write_dt_entry,
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.load_esp0 = native_load_esp0,
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.irq_enable_syscall_ret = native_irq_enable_syscall_ret,
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.iret = native_iret,
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.set_iopl_mask = native_set_iopl_mask,
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.io_delay = native_io_delay,
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.lazy_mode = {
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.enter = paravirt_nop,
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.leave = paravirt_nop,
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},
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};
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struct pv_apic_ops pv_apic_ops = {
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#ifdef CONFIG_X86_LOCAL_APIC
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.apic_write = native_apic_write,
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.apic_write_atomic = native_apic_write_atomic,
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.apic_read = native_apic_read,
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.setup_boot_clock = setup_boot_APIC_clock,
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.setup_secondary_clock = setup_secondary_APIC_clock,
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.startup_ipi_hook = paravirt_nop,
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#endif
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};
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struct pv_mmu_ops pv_mmu_ops = {
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.pagetable_setup_start = native_pagetable_setup_start,
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.pagetable_setup_done = native_pagetable_setup_done,
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.read_cr2 = native_read_cr2,
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.write_cr2 = native_write_cr2,
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.read_cr3 = native_read_cr3,
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.write_cr3 = native_write_cr3,
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.flush_tlb_user = native_flush_tlb,
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.flush_tlb_kernel = native_flush_tlb_global,
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.flush_tlb_single = native_flush_tlb_single,
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.flush_tlb_others = native_flush_tlb_others,
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.alloc_pt = paravirt_nop,
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.alloc_pd = paravirt_nop,
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.alloc_pd_clone = paravirt_nop,
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.release_pt = paravirt_nop,
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.release_pd = paravirt_nop,
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.set_pte = native_set_pte,
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.set_pte_at = native_set_pte_at,
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.set_pmd = native_set_pmd,
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.pte_update = paravirt_nop,
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.pte_update_defer = paravirt_nop,
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#ifdef CONFIG_HIGHPTE
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.kmap_atomic_pte = kmap_atomic,
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#endif
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#ifdef CONFIG_X86_PAE
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.set_pte_atomic = native_set_pte_atomic,
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.set_pte_present = native_set_pte_present,
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.set_pud = native_set_pud,
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.pte_clear = native_pte_clear,
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.pmd_clear = native_pmd_clear,
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.pmd_val = native_pmd_val,
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.make_pmd = native_make_pmd,
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#endif
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.pte_val = native_pte_val,
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.pgd_val = native_pgd_val,
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.make_pte = native_make_pte,
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.make_pgd = native_make_pgd,
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.dup_mmap = paravirt_nop,
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.exit_mmap = paravirt_nop,
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.activate_mm = paravirt_nop,
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.lazy_mode = {
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.enter = paravirt_nop,
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.leave = paravirt_nop,
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},
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};
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EXPORT_SYMBOL_GPL(pv_time_ops);
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EXPORT_SYMBOL (pv_cpu_ops);
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EXPORT_SYMBOL (pv_mmu_ops);
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EXPORT_SYMBOL_GPL(pv_apic_ops);
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EXPORT_SYMBOL_GPL(pv_info);
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EXPORT_SYMBOL (pv_irq_ops);
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