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Smbios (OpenBSD): reads table address from dmesg

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This commit is contained in:
Carter Li
2026-04-14 00:46:50 +08:00
committed by Carter Li
parent 10f58e405e
commit ee7f574349
1 changed files with 29 additions and 18 deletions
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src/common/impl/smbios.c
+29 -18
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@@ -226,10 +226,25 @@ const FFSmbiosHeaderTable* ffGetSmbiosHeaderTable() {
smbiosTableInitialized = true;
FF_DEBUG("Initializing SMBIOS buffer");
ffStrbufInit(&buffer);
# if !__HAIKU__ && !__OpenBSD__ && !__DragonFly__ && !__GNU__
# if !__HAIKU__ && !__GNU__
# ifdef __linux__
FF_DEBUG("Using Linux implementation - trying /sys/firmware/dmi/tables/DMI");
if (!ffAppendFileBuffer("/sys/firmware/dmi/tables/DMI", &buffer))
# elif defined(__OpenBSD__)
{
FF_DEBUG("Using OpenBSD /var/run/dmesg.boot implementation");
char dmesg[8192];
ssize_t size = ffReadFileData("/var/run/dmesg.boot", sizeof(dmesg), dmesg);
if (size <= 0) {
goto fallback;
}
char* line = memmem(dmesg, sizeof(dmesg), "\nbios0 at mainbios0: SMBIOS rev. ", strlen("\nbios0 at mainbios0: SMBIOS rev. "));
if (!line) {
goto fallback;
}
line += strlen("\nbios0 at mainbios0: SMBIOS rev. ");
}
# endif
{
# if !defined(__sun) && !defined(__NetBSD__)
@@ -277,6 +292,7 @@ const FFSmbiosHeaderTable* ffGetSmbiosHeaderTable() {
FF_DEBUG("Attempting to read %zu bytes from physical address 0x%lx",
sizeof(entryPoint),
(unsigned long) entryAddress);
if (pread(fd, &entryPoint, sizeof(entryPoint), entryAddress) < 0x10) {
FF_DEBUG("pread failed: %s. Trying mmap", strerror(errno));
// `pread /dev/mem` returns EFAULT in FreeBSD
@@ -368,7 +384,7 @@ const FFSmbiosHeaderTable* ffGetSmbiosHeaderTable() {
entryPoint.Smbios30.SmbiosDocrev);
} else {
FF_DEBUG("Unknown SMBIOS entry point format");
return NULL;
goto fallback; // Dragonfly goes here
}
ffStrbufEnsureFixedLengthFree(&buffer, tableLength);
@@ -392,27 +408,23 @@ const FFSmbiosHeaderTable* ffGetSmbiosHeaderTable() {
FF_DEBUG("Successfully read SMBIOS table data via mmap: %u bytes", tableLength);
}
}
# else
{
fallback:
FF_DEBUG("Using fallback implementation",
return NULL;
# endif
fallback:
if (buffer.length == 0) {
const char* devMem =
# if __HAIKU__
"Haiku"
"/dev/misc/mem";
# else
"OpenBSD"
"/dev/mem"; // kern.securelevel must be -1
# endif
);
FF_DEBUG("Using physical memory searching implementation: %s", devMem);
uint32_t tableLength = 0;
off_t tableAddress = 0;
FF_AUTO_CLOSE_FD int fd = open(
# if __HAIKU__
"/dev/misc/mem"
# else
"/dev/mem" // kern.securelevel must be -1
# endif
,
O_RDONLY | O_CLOEXEC);
FF_AUTO_CLOSE_FD int fd = open(devMem, O_RDONLY | O_CLOEXEC);
if (fd < 0) {
FF_DEBUG("Failed to open memory device: %s", strerror(errno));
return NULL;
@@ -484,7 +496,6 @@ const FFSmbiosHeaderTable* ffGetSmbiosHeaderTable() {
return NULL;
}
}
# endif
if (!parseSmbiosTable((const uint8_t*) buffer.chars, buffer.length)) {
ffStrbufClear(&buffer);