A pair of C structures used for laying out the SMP per-cpu data space.

1 files changed, 101 insertions, 0 deletions

diff --git a/sys/i386/include/globaldata.h b/sys/i386/include/globaldata.h
new file mode 100644
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+++ b/sys/i386/include/globaldata.h
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+/*-
+ * Copyright (c) Peter Wemm <peter@netplex.com.au>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $Id$
+ */
+
+/*
+ * This structure maps out the global data that needs to be kept on a
+ * per-cpu basis.  genassym uses this to generate offsets for the assembler
+ * code, which also provides external symbols so that C can get at them as
+ * though they were really globals.
+ *
+ * The SMP parts are setup in pmap.c and locore.s for the BSP, and
+ * mp_machdep.c sets up the data for the AP's to "see" when they awake.
+ * The reason for doing it via a struct is so that an array of pointers
+ * to each CPU's data can be set up for things like "check curproc on all
+ * other processors"
+ */
+struct globaldata {
+	struct proc	*curproc;
+	struct proc	*npxproc;
+	struct pcb	*curpcb;
+	struct i386tss	common_tss;
+#ifdef VM86
+	struct segment_descriptor common_tssd;
+	u_int		private_tss;
+#endif
+#ifdef SMP
+	u_int		cpuid;
+	u_int		cpu_lockid;
+	u_int		other_cpus;
+	pd_entry_t	*my_idlePTD;
+	u_int		ss_tpr;
+	pt_entry_t	*prv_CMAP1;
+	pt_entry_t	*prv_CMAP2;
+	pt_entry_t	*prv_CMAP3;
+	int		inside_intr;
+#ifdef VM86
+	u_int		my_tr;			/* XX VM86 only */
+#endif
+#endif
+
+};
+
+#ifdef SMP
+/*
+ * This is the upper (0xff800000) address space layout that is per-cpu.
+ * It is setup in locore.s and pmap.c for the BSP and in mp_machdep.c for
+ * each AP.  genassym helps export this to the assembler code.
+ */
+struct privatespace {
+	/* page 0 - data page */
+	struct globaldata globaldata;
+	char		__filler0[PAGE_SIZE - sizeof(struct globaldata)];
+
+	/* page 1 - page table page */
+	pt_entry_t	prvpt[NPTEPG];
+
+	/* page 2 - local apic mapping */
+	lapic_t		lapic;
+	char		__filler1[PAGE_SIZE - sizeof(lapic_t)];
+
+	/* page 3,4 - idle stack (2 pages) */
+	char		idlestack[2 * PAGE_SIZE];
+
+	/* page 5,6,7 - CPAGE1,CPAGE2,CPAGE3 */
+	char		CPAGE1[PAGE_SIZE];
+	char		CPAGE2[PAGE_SIZE];
+	char		CPAGE3[PAGE_SIZE];
+
+	/* page 8-15 - spare, unmapped */
+	char		__filler2[8 * PAGE_SIZE];
+
+	/* page 16-31 - space for IO apics */
+	char		ioapics[16 * PAGE_SIZE];
+
+	/* page 32-47 - maybe other cpu's globaldata pages? */
+};
+#endif