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PhysicalMemory: better Linux compatibility

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李通洲
2024-05-13 06:38:00 +00:00
committed by Carter Li
parent 68942c1d3f
commit b80eb47ecd
1 changed files with 23 additions and 30 deletions
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src/util/smbiosHelper.c
+23 -30
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@@ -98,34 +98,17 @@ static_assert(offsetof(FFSmbios30EntryPoint, StructureTableAddress) == 0x10,
const FFSmbiosHeaderTable* ffGetSmbiosHeaderTable()
{
static void* buffer;
static FFstrbuf buffer;
static FFSmbiosHeaderTable table;
if (!buffer)
if (buffer.chars == NULL)
{
uint64_t bufLen = 0;
#ifdef __linux__
{
FF_AUTO_CLOSE_FD int fd = open("/sys/firmware/dmi/tables/DMI", O_RDONLY);
if (fd > 0)
{
struct stat st;
if (fstat(fd, &st) == 0)
{
buffer = mmap(NULL, (size_t) st.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (buffer == MAP_FAILED)
buffer = NULL;
else
bufLen = (uint64_t) st.st_size;
}
}
}
if (!buffer)
if (!ffAppendFileBuffer("/sys/firmware/dmi/tables/DMI", &buffer))
#endif
{
FF_STRBUF_AUTO_DESTROY strEntry = ffStrbufCreate();
// Only support SMBIOS 3.x for simplication
// Only support SMBIOS 3.x for simplification
#ifdef __FreeBSD__
if (!ffSettingsGetFreeBSDKenv("hint.smbios.0.mem", &strEntry))
return NULL;
@@ -155,20 +138,30 @@ const FFSmbiosHeaderTable* ffGetSmbiosHeaderTable()
entryPoint.EntryPointLength != sizeof(entryPoint))
return NULL;
// entryPoint.StructureTableAddress must be page aligned.
// Unaligned physical memory access results in all kinds of crashes.
buffer = mmap(NULL, entryPoint.StructureTableMaximumSize, PROT_READ, MAP_SHARED, fd, (loff_t) entryPoint.StructureTableAddress);
if (buffer == MAP_FAILED)
ffStrbufEnsureFixedLengthFree(&buffer, entryPoint.StructureTableMaximumSize);
if (pread(fd, buffer.chars, entryPoint.StructureTableMaximumSize, pEntry) == (loff_t) entryPoint.StructureTableMaximumSize)
{
buffer = NULL;
return NULL;
buffer.length = (uint32_t) entryPoint.StructureTableMaximumSize;
buffer.chars[buffer.length] = '\0';
}
else
{
// entryPoint.StructureTableAddress must be page aligned.
// Unaligned physical memory access results in all kinds of crashes.
void* p = mmap(NULL, entryPoint.StructureTableMaximumSize, PROT_READ, MAP_SHARED, fd, (loff_t) entryPoint.StructureTableAddress);
if (p == MAP_FAILED)
{
ffStrbufDestroy(&buffer); // free buffer and reset state
return NULL;
}
ffStrbufSetNS(&buffer, entryPoint.StructureTableMaximumSize, (char*) p);
munmap(p, entryPoint.StructureTableMaximumSize);
}
bufLen = entryPoint.StructureTableMaximumSize;
}
for (
const FFSmbiosHeader* header = (const FFSmbiosHeader*) buffer;
(const uint8_t*) header < (const uint8_t*) buffer + bufLen;
const FFSmbiosHeader* header = (const FFSmbiosHeader*) buffer.chars;
(const uint8_t*) header < (const uint8_t*) buffer.chars + buffer.length;
header = ffSmbiosNextEntry(header)
)
{