From 86804dadc870572c2149fec3ca1d6561a762ffc5 Mon Sep 17 00:00:00 2001 From: ambrisko Date: Fri, 14 Oct 2016 17:10:53 +0000 Subject: [PATCH] In UEFI mode expose the SMBIOS anchor base address via kenv so the kernel etc. can find out where the SMBIOS entry point is located. In pure UEFI mode the BIOS is not mapped into the standard address space so the SMBIOS table might not appear between 0xf0000 and 0xfffff. The UEFI environment can report this the location of the anchor. If it is reported then expose it as hint.smbios.0.mem. This can then be used by other tools. However, we should make smbios(4) useful and have it take this value and provide accesor function so ipmi(4) etc. don't have to parse and figure things about the SMBIOS table. I have some simple patches to smbios(4) to expose this address as sysctl and for ipmi(4) to get the base address. However, the real fix is to have ipmi(4) ask smbios(4) for what it wants and have smbios(4) parse it out and return it. This would make smbios(4) useful and reduce duplicated code. If this address doesn't point to the anchor then finding SMBIOS info. will fail as if this didn't exist. So there should be no harm. With this change and the following hack, dmidecode works on a bunch of UEFI machines that I tested: if kenv hint.smbios.0.mem > /dev/null then mkdir -p /sys/firmware/efi mount -t tmpfs -o size=8k tmpfs /sys/firmware/efi echo "SMBIOS=`kenv hint.smbios.0.mem`" > /sys/firmware/efi/systab fi Linux exposes this information via the /sys/firmware/efi/systab file which dmidecode looks at. We should update dmidecode to do this the FreeBSD way when we determine what that is! Reviewed by: jhb --- sys/boot/efi/loader/main.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/sys/boot/efi/loader/main.c b/sys/boot/efi/loader/main.c index 18b0f3cfec27..b5f2fd6bcca1 100644 --- a/sys/boot/efi/loader/main.c +++ b/sys/boot/efi/loader/main.c @@ -235,6 +235,7 @@ main(int argc, CHAR16 *argv[]) uint64_t pool_guid; UINTN k; int has_kbd; + char buf[40]; archsw.arch_autoload = efi_autoload; archsw.arch_getdev = efi_getdev; @@ -447,6 +448,9 @@ main(int argc, CHAR16 *argv[]) for (k = 0; k < ST->NumberOfTableEntries; k++) { guid = &ST->ConfigurationTable[k].VendorGuid; if (!memcmp(guid, &smbios, sizeof(EFI_GUID))) { + snprintf(buf, sizeof(buf), "%p", + ST->ConfigurationTable[k].VendorTable); + setenv("hint.smbios.0.mem", buf, 1); smbios_detect(ST->ConfigurationTable[k].VendorTable); break; } @@ -603,7 +607,8 @@ command_configuration(int argc, char *argv[]) else if (!memcmp(guid, &acpi20, sizeof(EFI_GUID))) printf("ACPI 2.0 Table"); else if (!memcmp(guid, &smbios, sizeof(EFI_GUID))) - printf("SMBIOS Table"); + printf("SMBIOS Table %p", + ST->ConfigurationTable[i].VendorTable); else if (!memcmp(guid, &dxe, sizeof(EFI_GUID))) printf("DXE Table"); else if (!memcmp(guid, &hoblist, sizeof(EFI_GUID)))