d582203578
Use patch type identifiers derived from the offset of the operation in the paravirt_ops structure. This avoids having to maintain a separate enum for patch site types. Also, since the identifier is derived from the offset into paravirt_ops, the offset can be derived from the identifier. This is used to remove replicated information in the various callsite macros, which has been a source of bugs in the past. This patch also drops the fused save_fl+cli operation, which doesn't really add much and makes things more complex - specifically because it breaks the 1:1 relationship between identifiers and offsets. If this operation turns out to be particularly beneficial, then the right answer is to define a new entrypoint for it. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Zachary Amsden <zach@vmware.com>
251 lines
6.7 KiB
C
251 lines
6.7 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/start_kernel.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(cli, "cli");
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DEF_NATIVE(sti, "sti");
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DEF_NATIVE(popf, "push %eax; popf");
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DEF_NATIVE(pushf, "pushf; pop %eax");
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DEF_NATIVE(iret, "iret");
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DEF_NATIVE(sti_sysexit, "sti; sysexit");
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static const struct native_insns
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{
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const char *start, *end;
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} native_insns[] = {
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[PARAVIRT_PATCH(irq_disable)] = { start_cli, end_cli },
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[PARAVIRT_PATCH(irq_enable)] = { start_sti, end_sti },
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[PARAVIRT_PATCH(restore_fl)] = { start_popf, end_popf },
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[PARAVIRT_PATCH(save_fl)] = { start_pushf, end_pushf },
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[PARAVIRT_PATCH(iret)] = { start_iret, end_iret },
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[PARAVIRT_PATCH(irq_enable_sysexit)] = { start_sti_sysexit, end_sti_sysexit },
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};
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static unsigned native_patch(u8 type, u16 clobbers, void *insns, unsigned len)
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{
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unsigned int insn_len;
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/* Don't touch it if we don't have a replacement */
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if (type >= ARRAY_SIZE(native_insns) || !native_insns[type].start)
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return len;
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insn_len = native_insns[type].end - native_insns[type].start;
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/* Similarly if we can't fit replacement. */
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if (len < insn_len)
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return len;
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memcpy(insns, native_insns[type].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(u32 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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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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.get_scheduled_cycles = native_read_tsc,
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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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#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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.map_pt_hook = paravirt_nop,
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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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.ptep_get_and_clear = native_ptep_get_and_clear,
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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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.startup_ipi_hook = paravirt_nop,
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};
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/*
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* NOTE: CONFIG_PARAVIRT is experimental and the paravirt_ops
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* semantics are subject to change. Hence we only do this
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* internal-only export of this, until it gets sorted out and
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* all lowlevel CPU ops used by modules are separately exported.
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*/
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EXPORT_SYMBOL_GPL(paravirt_ops);
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