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From e629bccb2ced5f9e52e142bd841d310434975c63 Mon Sep 17 00:00:00 2001
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From: Alexey Dokuchaev <danfe@nsu.ru>
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Date: Thu, 30 Nov 2017 16:27:48 +0100
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Subject: [PATCH 09/10] UEFI support on FreeBSD
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Currently, dmidecode(8) does not work on FreeBSD booted in UEFI mode.
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Previously it was understandable, since there are no things like Linuxish
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/proc/efi/systab or /sys/firmware/efi/systab to read from under FreeBSD.
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However, 7 months ago, ambrisko@ had added support for exposing the SMBIOS
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anchor base address via kernel environment:
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https://svnweb.freebsd.org/base?view=revision&revision=307326
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I've patched dmidecode.c to try to get the address from hint.smbios.0.mem
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and fall back to traditional address space scanning. I've tested it both
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on EFI (amd64 laptop) and non-EFI (i386 desktop) machines.
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---
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dmidecode.c | 33 +++++++++++++++++++++++++++++++++
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1 file changed, 33 insertions(+)
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diff --git a/dmidecode.c b/dmidecode.c
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index 6559567..aadef75 100644
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--- a/dmidecode.c
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+++ b/dmidecode.c
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@@ -64,6 +64,11 @@
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#include <stdlib.h>
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#include <unistd.h>
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+#ifdef __FreeBSD__
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+#include <errno.h>
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+#include <kenv.h>
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+#endif
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+
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#include "version.h"
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#include "config.h"
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#include "types.h"
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@@ -4934,13 +4939,18 @@ static int legacy_decode(u8 *buf, const char *devmem, u32 flags)
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#define EFI_NO_SMBIOS (-2)
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static int address_from_efi(off_t *address)
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{
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+#if defined(__linux__)
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FILE *efi_systab;
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const char *filename;
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char linebuf[64];
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+#elif defined(__FreeBSD__)
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+ char addrstr[KENV_MVALLEN + 1];
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+#endif
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int ret;
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*address = 0; /* Prevent compiler warning */
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+#if defined(__linux__)
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/*
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* Linux up to 2.6.6: /proc/efi/systab
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* Linux 2.6.7 and up: /sys/firmware/efi/systab
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@@ -4972,6 +4982,29 @@ static int address_from_efi(off_t *address)
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if (ret == EFI_NO_SMBIOS)
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fprintf(stderr, "%s: SMBIOS entry point missing\n", filename);
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+#elif defined(__FreeBSD__)
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+ /*
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+ * On FreeBSD, SMBIOS anchor base address in UEFI mode is exposed
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+ * via kernel environment:
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+ * https://svnweb.freebsd.org/base?view=revision&revision=307326
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+ */
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+ ret = kenv(KENV_GET, "hint.smbios.0.mem", addrstr, sizeof(addrstr));
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+ if (ret == -1)
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+ {
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+ if (errno != ENOENT)
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+ perror("kenv");
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+ return EFI_NOT_FOUND;
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+ }
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+
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+ *address = strtoull(addrstr, NULL, 0);
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+ if (!(opt.flags & FLAG_QUIET))
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+ printf("# SMBIOS entry point at 0x%08llx\n",
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+ (unsigned long long)*address);
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+
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+ ret = 0;
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+#else
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+ ret = EFI_NOT_FOUND;
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+#endif
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return ret;
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}
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--
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2.9.5
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