0bbc882680
- The MI portions of struct globaldata have been consolidated into a MI struct pcpu. The MD per-CPU data are specified via a macro defined in machine/pcpu.h. A macro was chosen over a struct mdpcpu so that the interface would be cleaner (PCPU_GET(my_md_field) vs. PCPU_GET(md.md_my_md_field)). - All references to globaldata are changed to pcpu instead. In a UP kernel, this data was stored as global variables which is where the original name came from. In an SMP world this data is per-CPU and ideally private to each CPU outside of the context of debuggers. This also included combining machine/globaldata.h and machine/globals.h into machine/pcpu.h. - The pointer to the thread using the FPU on i386 was renamed from npxthread to fpcurthread to be identical with other architectures. - Make the show pcpu ddb command MI with a MD callout to display MD fields. - The globaldata_register() function was renamed to pcpu_init() and now init's MI fields of a struct pcpu in addition to registering it with the internal array and list. - A pcpu_destroy() function was added to remove a struct pcpu from the internal array and list. Tested on: alpha, i386 Reviewed by: peter, jake
148 lines
4.6 KiB
C
148 lines
4.6 KiB
C
/*-
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* Copyright (c) Peter Wemm <peter@netplex.com.au>
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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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#ifdef _KERNEL
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#ifndef __GNUC__
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#error gcc is required to use 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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#define PCPU_MD_FIELDS \
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struct pcpu *pc_prvspace; /* Self-reference */ \
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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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int pc_currentldt
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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) ({ \
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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) ({ \
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__pcpu_type(name) __result; \
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\
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if (sizeof(__result) == 1) { \
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u_char __b; \
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__asm __volatile("movb %%fs:%1,%0" \
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: "=r" (__b) \
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: "m" (*(u_char *)(__pcpu_offset(name)))); \
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__result = *(__pcpu_type(name) *)&__b; \
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} else if (sizeof(__result) == 2) { \
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u_short __w; \
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__asm __volatile("movw %%fs:%1,%0" \
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: "=r" (__w) \
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: "m" (*(u_short *)(__pcpu_offset(name)))); \
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__result = *(__pcpu_type(name) *)&__w; \
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} else if (sizeof(__result) == 4) { \
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u_int __i; \
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__asm __volatile("movl %%fs:%1,%0" \
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: "=r" (__i) \
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: "m" (*(u_int *)(__pcpu_offset(name)))); \
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__result = *(__pcpu_type(name) *)&__i; \
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} else { \
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__result = *__PCPU_PTR(name); \
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} \
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\
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__result; \
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})
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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) ({ \
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__pcpu_type(name) __val = (val); \
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\
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if (sizeof(__val) == 1) { \
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u_char __b; \
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__b = *(u_char *)&__val; \
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__asm __volatile("movb %1,%%fs:%0" \
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: "=m" (*(u_char *)(__pcpu_offset(name))) \
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: "r" (__b)); \
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} else if (sizeof(__val) == 2) { \
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u_short __w; \
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__w = *(u_short *)&__val; \
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__asm __volatile("movw %1,%%fs:%0" \
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: "=m" (*(u_short *)(__pcpu_offset(name))) \
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: "r" (__w)); \
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} else if (sizeof(__val) == 4) { \
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u_int __i; \
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__i = *(u_int *)&__val; \
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__asm __volatile("movl %1,%%fs:%0" \
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: "=m" (*(u_int *)(__pcpu_offset(name))) \
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: "r" (__i)); \
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} else { \
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*__PCPU_PTR(name) = __val; \
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} \
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})
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#define PCPU_GET(member) __PCPU_GET(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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#endif /* _KERNEL */
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#endif /* ! _MACHINE_PCPU_H_ */
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