393 lines
9.7 KiB
C
393 lines
9.7 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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paravirt_ops.name);
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}
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char *memory_setup(void)
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{
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return paravirt_ops.memory_setup();
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}
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/* Simple instruction patching code. */
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#define DEF_NATIVE(name, code) \
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extern const char start_##name[], end_##name[]; \
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asm("start_" #name ": " code "; end_" #name ":")
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DEF_NATIVE(irq_disable, "cli");
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DEF_NATIVE(irq_enable, "sti");
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DEF_NATIVE(restore_fl, "push %eax; popf");
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DEF_NATIVE(save_fl, "pushf; pop %eax");
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DEF_NATIVE(iret, "iret");
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DEF_NATIVE(irq_enable_sysexit, "sti; sysexit");
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DEF_NATIVE(read_cr2, "mov %cr2, %eax");
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DEF_NATIVE(write_cr3, "mov %eax, %cr3");
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DEF_NATIVE(read_cr3, "mov %cr3, %eax");
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DEF_NATIVE(clts, "clts");
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DEF_NATIVE(read_tsc, "rdtsc");
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DEF_NATIVE(ud2a, "ud2a");
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static unsigned native_patch(u8 type, u16 clobbers, void *insns, 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(x) case PARAVIRT_PATCH(x): start = start_##x; end = end_##x; goto patch_site
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SITE(irq_disable);
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SITE(irq_enable);
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SITE(restore_fl);
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SITE(save_fl);
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SITE(iret);
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SITE(irq_enable_sysexit);
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SITE(read_cr2);
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SITE(read_cr3);
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SITE(write_cr3);
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SITE(clts);
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SITE(read_tsc);
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#undef SITE
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patch_site:
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ret = paravirt_patch_insns(insns, len, start, end);
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break;
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case PARAVIRT_PATCH(make_pgd):
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case PARAVIRT_PATCH(make_pte):
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case PARAVIRT_PATCH(pgd_val):
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case PARAVIRT_PATCH(pte_val):
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#ifdef CONFIG_X86_PAE
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case PARAVIRT_PATCH(make_pmd):
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case PARAVIRT_PATCH(pmd_val):
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#endif
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/* These functions end up returning exactly what
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they're passed, in the same registers. */
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ret = paravirt_patch_nop();
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break;
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default:
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ret = paravirt_patch_default(type, clobbers, insns, 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 *target, u16 tgt_clobbers,
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void *site, u16 site_clobbers,
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unsigned len)
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{
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unsigned char *call = site;
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unsigned long delta = (unsigned long)target - (unsigned long)(call+5);
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struct branch b;
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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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text_poke(call, (unsigned char *)&b, 5);
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return 5;
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}
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unsigned paravirt_patch_jmp(void *target, void *site, unsigned len)
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{
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unsigned char *jmp = site;
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unsigned long delta = (unsigned long)target - (unsigned long)(jmp+5);
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struct branch b;
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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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text_poke(jmp, (unsigned char *)&b, 5);
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return 5;
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}
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unsigned paravirt_patch_default(u8 type, u16 clobbers, void *site, unsigned len)
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{
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void *opfunc = *((void **)¶virt_ops + 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(site, len, start_ud2a, end_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(iret) ||
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type == PARAVIRT_PATCH(irq_enable_sysexit))
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/* If operation requires a jmp, then jmp */
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ret = paravirt_patch_jmp(opfunc, site, 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(opfunc, CLBR_ANY,
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site, clobbers, len);
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return ret;
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}
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unsigned paravirt_patch_insns(void *site, 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(site, 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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paravirt_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_sysexit(void);
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static int __init print_banner(void)
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{
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paravirt_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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struct paravirt_ops paravirt_ops = {
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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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.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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.get_wallclock = native_get_wallclock,
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.set_wallclock = native_set_wallclock,
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.time_init = hpet_time_init,
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.init_IRQ = native_init_IRQ,
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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_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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.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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.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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.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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.sched_clock = native_sched_clock,
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.get_cpu_khz = native_calculate_cpu_khz,
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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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.set_iopl_mask = native_set_iopl_mask,
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.io_delay = native_io_delay,
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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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.set_lazy_mode = paravirt_nop,
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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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.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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.irq_enable_sysexit = native_irq_enable_sysexit,
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.iret = native_iret,
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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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};
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EXPORT_SYMBOL(paravirt_ops);
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