Teach the loader how to find the system ACPI information, and autoload

the ACPI module if the system apperars to be ACPI compliant.

This is an initial cut; the load should really be done by Forth support
code, and we should check both the BIOS build date and a blacklist.

sys/boot/i386/libi386/Makefile

@@ -6,12 +6,13 @@ NOPROFILE=
 INTERNALLIB=		true
 INTERNALSTATICLIB=	true
 
-SRCS=	aout_freebsd.c biosdisk.c biosmem.c biospnp.c biospci.c \
+SRCS=	aout_freebsd.c biosacpi.c biosdisk.c biosmem.c biospnp.c biospci.c \
 	bootinfo.c comconsole.c devicename.c elf_freebsd.c gatea20.c \
 	i386_copy.c i386_module.c nullconsole.c pxe.c pxetramp.s \
 	time.c vidconsole.c
 
 CFLAGS+=	-I${.CURDIR}/../../common -I${.CURDIR}/../btx/lib \
+		-I${.CURDIR}/../../../contrib/dev/acpica \
 		-I${.CURDIR}/../../.. -I.
 
 BOOT_COMCONSOLE_PORT?= 0x3f8

sys/boot/i386/libi386/biosacpi.c

@@ -0,0 +1,126 @@
+/*-
+ * Copyright (c) 2001 Michael Smith <msmith@freebsd.org>
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <stand.h>
+#include <machine/stdarg.h>
+#include <bootstrap.h>
+
+#define COMPILER_DEPENDENT_UINT64	long long
+#include "actypes.h"
+#include "actbl.h"
+
+/*
+ * Detect ACPI and export information about the APCI BIOS into the
+ * environment.
+ */
+
+static RSDP_DESCRIPTOR	*biosacpi_find_rsdp(void);
+static RSDP_DESCRIPTOR	*biosacpi_search_rsdp(char *base, int length);
+
+#define RSDP_CHECKSUM_LENGTH 20
+
+void
+biosacpi_detect(void)
+{
+    RSDP_DESCRIPTOR	*rsdp;
+    char		buf[16];
+    int			revision;
+
+    /* XXX check the BIOS datestamp */
+
+    /* locate and validate the RSDP */
+    if ((rsdp = biosacpi_find_rsdp()) == NULL)
+	return;
+
+    /* export values from the RSDP */
+    revision = rsdp->Revision;
+    if (revision == 0)
+	revision = 1;
+    sprintf(buf, "%d", revision);
+    setenv("hint.acpi.0.revision", buf, 1);
+    sprintf(buf, "%6s", rsdp->OemId);
+    setenv("hint.acpi.0.oem", buf, 1);
+    sprintf(buf, "0x%08x", rsdp->RsdtPhysicalAddress);
+    setenv("hint.acpi.0.rsdt", buf, 1);
+    if (revision >= 2) {
+	/* XXX extended checksum? */
+	sprintf(buf, "0x%016llx", rsdp->XsdtPhysicalAddress);
+	setenv("hint.acpi.0.xsdt", buf, 1);
+	sprintf(buf, "%d", rsdp->Length);
+	setenv("hint.acpi.0.xsdt_length", buf, 1);
+    }
+    /* XXX other tables? */
+
+    setenv("acpi_load", "YES", 1);
+}
+
+/*
+ * Find the RSDP in low memory.
+ */
+static RSDP_DESCRIPTOR *
+biosacpi_find_rsdp(void)
+{
+    RSDP_DESCRIPTOR	*rsdp;
+
+    /* search the EBDA */
+    if ((rsdp = biosacpi_search_rsdp((char *)0, 0x400)) != NULL)
+	return(rsdp);
+
+    /* search the BIOS space */
+    if ((rsdp = biosacpi_search_rsdp((char *)0xe0000, 0x20000)) != NULL)
+	return(rsdp);
+
+    return(NULL);
+}
+
+static RSDP_DESCRIPTOR *
+biosacpi_search_rsdp(char *base, int length)
+{
+    RSDP_DESCRIPTOR	*rsdp;
+    u_int8_t		*cp, sum;
+    int			ofs, idx;
+
+    /* search on 16-byte boundaries */
+    for (ofs = 0; ofs < length; ofs += 16) {
+	rsdp = (RSDP_DESCRIPTOR *)(base + ofs);
+
+	/* compare signature, validate checksum */
+	if (!strncmp(rsdp->Signature, RSDP_SIG, strlen(RSDP_SIG))) {
+	    cp = (u_int8_t *)rsdp;
+	    sum = 0;
+	    for (idx = 0; idx < RSDP_CHECKSUM_LENGTH; idx++)
+		sum += *(cp + idx);
+	    if (sum != 0) {
+		printf("acpi: bad RSDP checksum (%d)\n", sum);
+		continue;
+	    }
+	    return(rsdp);
+	}
+    }
+    return(NULL);
+}

sys/boot/i386/libi386/i386_module.c

@@ -43,6 +43,17 @@
 int
 i386_autoload(void)
 {
+    int		error;
+
     /* XXX use PnP to locate stuff here */
+
+    /* autoload ACPI support */
+    /* XXX should be in 4th keyed off acpi_load */
+    if ((getenv("acpi_load") && !getenv("hint.acpi.0.disable"))) {
+	error = mod_load("acpi", 0, NULL);
+	if (error != 0)
+	    printf("ACPI autoload failed - %s\n", strerror(error));
+    }
+	
     return(0);
 }

sys/boot/i386/libi386/libi386.h

@@ -79,6 +79,8 @@ extern u_int32_t	bios_basemem;				/* base memory in bytes */
 extern u_int32_t	bios_extmem;				/* extended memory in bytes */
 extern vm_offset_t	memtop;
 
+void	biosacpi_detect();
+
 void	gateA20(void);
 
 int	i386_autoload(void);

sys/boot/i386/loader/main.c

@@ -125,6 +125,9 @@ main(void)
 	    (devsw[i]->dv_init)();
     printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024);
 
+    /* detect ACPI for future reference */
+    biosacpi_detect();
+
     printf("\n");
     printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
     printf("(%s, %s)\n", bootprog_maker, bootprog_date);