bd3bce41db
system. This uses the hints mechnanism. This mostly works today because when there's no static hints (the default), this value can be fetched from the hint. When there is a static hints file, the hint passed from the boot loader to the kernel is ignored, but for the BIOS case we're able to find it anyway. However, with UEFI, the fallback doesn't work, so we get a panic instead. Switch to acpi.rsdp and use TUNABLE_ULONG_FETCH instead. Continue to generate the old values to allow for transitions. In addition, fall back to the old method if the new method isn't present. Add comments about all this. Differential Revision: https://reviews.freebsd.org/D5866
145 lines
4.5 KiB
C
145 lines
4.5 KiB
C
/*-
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* Copyright (c) 2001 Michael Smith <msmith@freebsd.org>
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stand.h>
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#include <machine/stdarg.h>
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#include <bootstrap.h>
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#include <btxv86.h>
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#include "libi386.h"
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#include "platform/acfreebsd.h"
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#include "acconfig.h"
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#define ACPI_SYSTEM_XFACE
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#include "actypes.h"
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#include "actbl.h"
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/*
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* Detect ACPI and export information about the ACPI BIOS into the
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* environment.
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*/
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static ACPI_TABLE_RSDP *biosacpi_find_rsdp(void);
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static ACPI_TABLE_RSDP *biosacpi_search_rsdp(char *base, int length);
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#define RSDP_CHECKSUM_LENGTH 20
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void
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biosacpi_detect(void)
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{
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ACPI_TABLE_RSDP *rsdp;
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char buf[24];
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int revision;
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/* locate and validate the RSDP */
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if ((rsdp = biosacpi_find_rsdp()) == NULL)
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return;
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/*
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* Report the RSDP to the kernel. While this can be found with
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* a BIOS boot, the RSDP may be elsewhere when booted from UEFI.
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* The old code used the 'hints' method to communite this to
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* the kernel. However, while convenient, the 'hints' method
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* is fragile and does not work when static hints are compiled
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* into the kernel. Instead, move to setting different tunables
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* that start with acpi. The old 'hints' can be removed before
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* we branch for FreeBSD 12.
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*/
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sprintf(buf, "0x%08x", VTOP(rsdp));
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setenv("hint.acpi.0.rsdp", buf, 1);
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setenv("acpi.rsdp", buf, 1);
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revision = rsdp->Revision;
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if (revision == 0)
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revision = 1;
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sprintf(buf, "%d", revision);
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setenv("hint.acpi.0.revision", buf, 1);
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setenv("acpi.revision", buf, 1);
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strncpy(buf, rsdp->OemId, sizeof(rsdp->OemId));
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buf[sizeof(rsdp->OemId)] = '\0';
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setenv("hint.acpi.0.oem", buf, 1);
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setenv("acpi.oem", buf, 1);
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sprintf(buf, "0x%08x", rsdp->RsdtPhysicalAddress);
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setenv("hint.acpi.0.rsdt", buf, 1);
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setenv("acpi.rsdt", buf, 1);
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if (revision >= 2) {
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/* XXX extended checksum? */
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sprintf(buf, "0x%016llx", rsdp->XsdtPhysicalAddress);
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setenv("hint.acpi.0.xsdt", buf, 1);
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setenv("acpi.xsdt", buf, 1);
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sprintf(buf, "%d", rsdp->Length);
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setenv("hint.acpi.0.xsdt_length", buf, 1);
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setenv("acpi.xsdt_length", buf, 1);
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}
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}
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/*
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* Find the RSDP in low memory. See section 5.2.2 of the ACPI spec.
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*/
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static ACPI_TABLE_RSDP *
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biosacpi_find_rsdp(void)
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{
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ACPI_TABLE_RSDP *rsdp;
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uint16_t *addr;
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/* EBDA is the 1 KB addressed by the 16 bit pointer at 0x40E. */
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addr = (uint16_t *)PTOV(0x40E);
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if ((rsdp = biosacpi_search_rsdp((char *)(*addr << 4), 0x400)) != NULL)
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return (rsdp);
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/* Check the upper memory BIOS space, 0xe0000 - 0xfffff. */
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if ((rsdp = biosacpi_search_rsdp((char *)0xe0000, 0x20000)) != NULL)
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return (rsdp);
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return (NULL);
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}
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static ACPI_TABLE_RSDP *
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biosacpi_search_rsdp(char *base, int length)
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{
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ACPI_TABLE_RSDP *rsdp;
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u_int8_t *cp, sum;
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int ofs, idx;
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/* search on 16-byte boundaries */
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for (ofs = 0; ofs < length; ofs += 16) {
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rsdp = (ACPI_TABLE_RSDP *)PTOV(base + ofs);
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/* compare signature, validate checksum */
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if (!strncmp(rsdp->Signature, ACPI_SIG_RSDP, strlen(ACPI_SIG_RSDP))) {
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cp = (u_int8_t *)rsdp;
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sum = 0;
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for (idx = 0; idx < RSDP_CHECKSUM_LENGTH; idx++)
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sum += *(cp + idx);
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if (sum != 0)
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continue;
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return(rsdp);
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}
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}
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return(NULL);
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}
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