2913e88c91
mechanical change. This opens the door for using PV device drivers under Xen HVM on i386, as well as more general harmonisation of i386 and amd64 Xen support in FreeBSD. Reviewed by: cperciva MFC after: 3 weeks
258 lines
7.7 KiB
C
258 lines
7.7 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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#if defined(XEN) || defined(XENHVM)
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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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#endif
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#if defined(XEN)
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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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#elif defined(XENHVM)
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#define PCPU_XEN_FIELDS \
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; \
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unsigned int pc_last_processed_l1i; \
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unsigned int pc_last_processed_l2i
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#else /* !XEN && !XENHVM */
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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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