536af0d751
from the inline assembly. This allows the compiler to cache invocations of curthread since it's value does not change within a thread context. Submitted by: zec (i386) MFC after: 1 week
245 lines
7.4 KiB
C
245 lines
7.4 KiB
C
/*-
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* Copyright (c) Peter Wemm
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_PCPU_H_
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#define _MACHINE_PCPU_H_
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#ifndef _SYS_CDEFS_H_
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#error "sys/cdefs.h is a prerequisite for this file"
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#endif
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#include <machine/segments.h>
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#include <machine/tss.h>
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/*
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* The SMP parts are setup in pmap.c and locore.s for the BSP, and
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* mp_machdep.c sets up the data for the AP's to "see" when they awake.
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* The reason for doing it via a struct is so that an array of pointers
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* to each CPU's data can be set up for things like "check curproc on all
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* other processors"
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*/
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#ifdef XEN
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#ifndef NR_VIRQS
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#define NR_VIRQS 24
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#endif
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#ifndef NR_IPIS
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#define NR_IPIS 2
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#endif
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/* These are peridically updated in shared_info, and then copied here. */
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struct shadow_time_info {
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uint64_t tsc_timestamp; /* TSC at last update of time vals. */
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uint64_t system_timestamp; /* Time, in nanosecs, since boot. */
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uint32_t tsc_to_nsec_mul;
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uint32_t tsc_to_usec_mul;
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int tsc_shift;
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uint32_t version;
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};
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#define PCPU_XEN_FIELDS \
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; \
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u_int pc_cr3; /* track cr3 for R1/R3*/ \
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vm_paddr_t *pc_pdir_shadow; \
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uint64_t pc_processed_system_time; \
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struct shadow_time_info pc_shadow_time; \
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int pc_resched_irq; \
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int pc_callfunc_irq; \
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int pc_virq_to_irq[NR_VIRQS]; \
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int pc_ipi_to_irq[NR_IPIS]
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#else
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#define PCPU_XEN_FIELDS
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#endif
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#define PCPU_MD_FIELDS \
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char pc_monitorbuf[128] __aligned(128); /* cache line */ \
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struct pcpu *pc_prvspace; /* Self-reference */ \
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struct pmap *pc_curpmap; \
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struct i386tss pc_common_tss; \
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struct segment_descriptor pc_common_tssd; \
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struct segment_descriptor *pc_tss_gdt; \
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struct segment_descriptor *pc_fsgs_gdt; \
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int pc_currentldt; \
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u_int pc_acpi_id; /* ACPI CPU id */ \
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u_int pc_apic_id; \
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int pc_private_tss; /* Flag indicating private tss*/\
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u_int pc_cmci_mask /* MCx banks for CMCI */ \
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PCPU_XEN_FIELDS
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#ifdef _KERNEL
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#ifdef lint
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extern struct pcpu *pcpup;
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#define PCPU_GET(member) (pcpup->pc_ ## member)
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#define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val))
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#define PCPU_INC(member) PCPU_ADD(member, 1)
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#define PCPU_PTR(member) (&pcpup->pc_ ## member)
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#define PCPU_SET(member, val) (pcpup->pc_ ## member = (val))
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#elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
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/*
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* Evaluates to the byte offset of the per-cpu variable name.
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*/
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#define __pcpu_offset(name) \
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__offsetof(struct pcpu, name)
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/*
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* Evaluates to the type of the per-cpu variable name.
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*/
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#define __pcpu_type(name) \
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__typeof(((struct pcpu *)0)->name)
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/*
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* Evaluates to the address of the per-cpu variable name.
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*/
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#define __PCPU_PTR(name) __extension__ ({ \
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__pcpu_type(name) *__p; \
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\
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__asm __volatile("movl %%fs:%1,%0; addl %2,%0" \
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: "=r" (__p) \
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: "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \
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"i" (__pcpu_offset(name))); \
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\
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__p; \
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})
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/*
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* Evaluates to the value of the per-cpu variable name.
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*/
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#define __PCPU_GET(name) __extension__ ({ \
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__pcpu_type(name) __res; \
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struct __s { \
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u_char __b[MIN(sizeof(__res), 4)]; \
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} __s; \
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\
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if (sizeof(__res) == 1 || sizeof(__res) == 2 || \
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sizeof(__res) == 4) { \
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__asm __volatile("mov %%fs:%1,%0" \
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: "=r" (__s) \
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: "m" (*(struct __s *)(__pcpu_offset(name)))); \
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*(struct __s *)(void *)&__res = __s; \
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} else { \
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__res = *__PCPU_PTR(name); \
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} \
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__res; \
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})
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/*
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* Adds a value of the per-cpu counter name. The implementation
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* must be atomic with respect to interrupts.
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*/
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#define __PCPU_ADD(name, val) do { \
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__pcpu_type(name) __val; \
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struct __s { \
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u_char __b[MIN(sizeof(__val), 4)]; \
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} __s; \
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\
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__val = (val); \
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if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
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sizeof(__val) == 4) { \
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__s = *(struct __s *)(void *)&__val; \
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__asm __volatile("add %1,%%fs:%0" \
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: "=m" (*(struct __s *)(__pcpu_offset(name))) \
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: "r" (__s)); \
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} else \
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*__PCPU_PTR(name) += __val; \
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} while (0)
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/*
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* Increments the value of the per-cpu counter name. The implementation
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* must be atomic with respect to interrupts.
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*/
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#define __PCPU_INC(name) do { \
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CTASSERT(sizeof(__pcpu_type(name)) == 1 || \
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sizeof(__pcpu_type(name)) == 2 || \
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sizeof(__pcpu_type(name)) == 4); \
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if (sizeof(__pcpu_type(name)) == 1) { \
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__asm __volatile("incb %%fs:%0" \
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: "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
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: "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
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} else if (sizeof(__pcpu_type(name)) == 2) { \
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__asm __volatile("incw %%fs:%0" \
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: "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
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: "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
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} else if (sizeof(__pcpu_type(name)) == 4) { \
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__asm __volatile("incl %%fs:%0" \
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: "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
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: "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
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} \
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} while (0)
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/*
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* Sets the value of the per-cpu variable name to value val.
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*/
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#define __PCPU_SET(name, val) do { \
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__pcpu_type(name) __val; \
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struct __s { \
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u_char __b[MIN(sizeof(__val), 4)]; \
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} __s; \
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\
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__val = (val); \
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if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
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sizeof(__val) == 4) { \
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__s = *(struct __s *)(void *)&__val; \
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__asm __volatile("mov %1,%%fs:%0" \
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: "=m" (*(struct __s *)(__pcpu_offset(name))) \
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: "r" (__s)); \
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} else { \
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*__PCPU_PTR(name) = __val; \
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} \
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} while (0)
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#define PCPU_GET(member) __PCPU_GET(pc_ ## member)
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#define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val)
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#define PCPU_INC(member) __PCPU_INC(pc_ ## member)
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#define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
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#define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
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static __inline __pure2 struct thread *
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__curthread(void)
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{
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struct thread *td;
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__asm("movl %%fs:0,%0" : "=r" (td));
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return (td);
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}
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#define curthread (__curthread())
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#else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
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#error "this file needs to be ported to your compiler"
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#endif /* lint, etc. */
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#endif /* _KERNEL */
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#endif /* !_MACHINE_PCPU_H_ */
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