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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] [HVMLOADER] Clean up SMBIOS table-length computations.
# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Node ID f426f6e646eb88d143b44f0b60fe1a3f83201509
# Parent 0d796dced5f72023009f9be2612d3f3b6fc095d1
[HVMLOADER] Clean up SMBIOS table-length computations.
It's easier and less prone to error not to attempt the
length computation up front.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
tools/firmware/hvmloader/hvmloader.c | 6 -
tools/firmware/hvmloader/smbios.c | 146 ++++++++++++-----------------------
2 files changed, 55 insertions(+), 97 deletions(-)
diff -r 0d796dced5f7 -r f426f6e646eb tools/firmware/hvmloader/hvmloader.c
--- a/tools/firmware/hvmloader/hvmloader.c Mon Oct 02 16:12:41 2006 +0100
+++ b/tools/firmware/hvmloader/hvmloader.c Mon Oct 02 18:04:56 2006 +0100
@@ -170,6 +170,9 @@ main(void)
init_hypercalls();
+ puts("Writing SMBIOS tables ...\n");
+ hvm_write_smbios_tables();
+
puts("Loading ROMBIOS ...\n");
memcpy((void *)ROMBIOS_PHYSICAL_ADDRESS, rombios, sizeof(rombios));
@@ -201,9 +204,6 @@ main(void)
}
}
- puts("Writing SMBIOS tables ...\n");
- hvm_write_smbios_tables();
-
if (check_amd()) {
/* AMD implies this is SVM */
puts("SVM go ...\n");
diff -r 0d796dced5f7 -r f426f6e646eb tools/firmware/hvmloader/smbios.c
--- a/tools/firmware/hvmloader/smbios.c Mon Oct 02 16:12:41 2006 +0100
+++ b/tools/firmware/hvmloader/smbios.c Mon Oct 02 18:04:56 2006 +0100
@@ -28,23 +28,15 @@
#include "util.h"
#include "hypercall.h"
-/* write SMBIOS tables starting at 'start', without writing more
- than 'max_size' bytes.
-
- Return the number of bytes written
-*/
static size_t
-write_smbios_tables(void *start, size_t max_size,
+write_smbios_tables(void *start,
uint32_t vcpus, uint64_t memsize,
uint8_t uuid[16], char *xen_version,
uint32_t xen_major_version, uint32_t xen_minor_version);
static void
get_cpu_manufacturer(char *buf, int len);
-static size_t
-smbios_table_size(uint32_t vcpus, const char *xen_version,
- const char *processor_manufacturer);
-static void *
+static void
smbios_entry_point_init(void *start,
uint16_t max_structure_size,
uint16_t structure_table_length,
@@ -71,7 +63,7 @@ smbios_type_20_init(void *start, uint32_
smbios_type_20_init(void *start, uint32_t memory_size_mb);
static void *
smbios_type_32_init(void *start);
-void *
+static void *
smbios_type_127_init(void *start);
static void
@@ -80,7 +72,8 @@ get_cpu_manufacturer(char *buf, int len)
char id[12];
uint32_t eax = 0;
- cpuid(0, &eax, (uint32_t *)&id[0], (uint32_t *)&id[8], (uint32_t
*)&id[4]);
+ cpuid(0, &eax, (uint32_t *)&id[0], (uint32_t *)&id[8],
+ (uint32_t *)&id[4]);
if (memcmp(id, "GenuineIntel", 12) == 0)
strncpy(buf, "Intel", len);
@@ -90,90 +83,51 @@ get_cpu_manufacturer(char *buf, int len)
strncpy(buf, "unknown", len);
}
-
-/* Calculate the size of the SMBIOS structure table.
-*/
static size_t
-smbios_table_size(uint32_t vcpus, const char *xen_version,
- const char *processor_manufacturer)
-{
- size_t size;
-
- /* first compute size without strings or terminating 0 bytes */
- size = sizeof(struct smbios_type_0) + sizeof(struct smbios_type_1) +
- sizeof(struct smbios_type_3) + sizeof(struct
smbios_type_4)*vcpus +
- sizeof(struct smbios_type_16) + sizeof(struct smbios_type_17) +
- sizeof(struct smbios_type_19) + sizeof(struct smbios_type_20) +
- sizeof(struct smbios_type_32) + sizeof(struct smbios_type_127);
-
- /* 5 structures with no strings, 2 null bytes each */
- size += 10;
-
- /* Need to include 1 null byte per structure with strings (first
- terminating null byte comes from the string terminator of the
- last string). */
- size += 4 + vcpus;
-
- /* type 0: "Xen", xen_version, and release_date */
- size += strlen("Xen") + strlen(xen_version) + 2;
- /* type 1: "Xen", xen_version, "HVM domU", UUID as string for
- serial number */
- size += strlen("Xen") + strlen("HVM domU") + strlen(xen_version) +
- 36 + 4;
- /* type 3: "Xen" */
- size += strlen("Xen") + 1;
- /* type 4: socket designation ("CPU n"), processor_manufacturer */
- size += vcpus * (strlen("CPU n") + strlen(processor_manufacturer) + 2);
- /* Make room for two-digit CPU numbers if necessary -- doesn't handle
- vcpus > 99 */
- if (vcpus > 9)
- size += vcpus - 9;
- /* type 17: device locator string ("DIMM 1") */
- size += strlen("DIMM 1") + 1;
-
- return size;
-}
-
-static size_t
-write_smbios_tables(void *start, size_t max_size,
+write_smbios_tables(void *start,
uint32_t vcpus, uint64_t memsize,
uint8_t uuid[16], char *xen_version,
uint32_t xen_major_version, uint32_t xen_minor_version)
{
- unsigned cpu_num;
- void *p = start;
+ unsigned cpu_num, nr_structs = 0, max_struct_size = 0;
+ char *p, *q;
char cpu_manufacturer[15];
size_t structure_table_length;
get_cpu_manufacturer(cpu_manufacturer, 15);
-
- structure_table_length = smbios_table_size(vcpus, xen_version,
- cpu_manufacturer);
-
- if (structure_table_length + sizeof(struct smbios_entry_point) >
max_size)
- return 0;
-
- p = smbios_entry_point_init(p, sizeof(struct smbios_type_4),
- structure_table_length,
- (uint32_t)start +
- sizeof(struct smbios_entry_point),
- 9 + vcpus);
-
- p = smbios_type_0_init(p, xen_version, xen_major_version,
- xen_minor_version);
- p = smbios_type_1_init(p, xen_version, uuid);
- p = smbios_type_3_init(p);
- for (cpu_num = 1; cpu_num <= vcpus; ++cpu_num)
- p = smbios_type_4_init(p, cpu_num, cpu_manufacturer);
- p = smbios_type_16_init(p, memsize);
- p = smbios_type_17_init(p, memsize);
- p = smbios_type_19_init(p, memsize);
- p = smbios_type_20_init(p, memsize);
- p = smbios_type_32_init(p);
- p = smbios_type_127_init(p);
-
- return (size_t)((char*)p - (char*)start);
+ p = (char *)start + sizeof(struct smbios_entry_point);
+
+#define do_struct(fn) do { \
+ q = (fn); \
+ nr_structs++; \
+ if ((q - p) > max_struct_size) \
+ max_struct_size = q - p; \
+ p = q; \
+} while (0)
+
+ do_struct(smbios_type_0_init(p, xen_version, xen_major_version,
+ xen_minor_version));
+ do_struct(smbios_type_1_init(p, xen_version, uuid));
+ do_struct(smbios_type_3_init(p));
+ for (cpu_num = 1; cpu_num <= vcpus; cpu_num++)
+ do_struct(smbios_type_4_init(p, cpu_num, cpu_manufacturer));
+ do_struct(smbios_type_16_init(p, memsize));
+ do_struct(smbios_type_17_init(p, memsize));
+ do_struct(smbios_type_19_init(p, memsize));
+ do_struct(smbios_type_20_init(p, memsize));
+ do_struct(smbios_type_32_init(p));
+ do_struct(smbios_type_127_init(p));
+
+#undef do_struct
+
+ smbios_entry_point_init(
+ start, max_struct_size,
+ (p - (char *)start) - sizeof(struct smbios_entry_point),
+ SMBIOS_PHYSICAL_ADDRESS + sizeof(struct smbios_entry_point),
+ nr_structs);
+
+ return (size_t)((char *)p - (char *)start);
}
/* This tries to figure out how much pseudo-physical memory (in MB)
@@ -278,10 +232,16 @@ hvm_write_smbios_tables(void)
xen_version_str[sizeof(xen_version_str)-1] = '\0';
- write_smbios_tables((void *) SMBIOS_PHYSICAL_ADDRESS,
- SMBIOS_SIZE_LIMIT, get_vcpu_nr(), get_memsize(),
- uuid, xen_version_str,
- xen_major_version, xen_minor_version);
+ /* NB. 0xC0000 is a safe large memory area for scratch. */
+ len = write_smbios_tables((void *)0xC0000,
+ get_vcpu_nr(), get_memsize(),
+ uuid, xen_version_str,
+ xen_major_version, xen_minor_version);
+ if (len > SMBIOS_SIZE_LIMIT)
+ goto error_out;
+ /* Okay, not too large: copy out of scratch to final location. */
+ memcpy((void *)SMBIOS_PHYSICAL_ADDRESS, (void *)0xC0000, len);
+
return;
error_out:
@@ -290,7 +250,7 @@ hvm_write_smbios_tables(void)
}
-static void *
+static void
smbios_entry_point_init(void *start,
uint16_t max_structure_size,
uint16_t structure_table_length,
@@ -327,8 +287,6 @@ smbios_entry_point_init(void *start,
for (i = 0x10; i < ep->length; ++i)
sum += ((int8_t *)start)[i];
ep->intermediate_checksum = -sum;
-
- return (char *)start + sizeof(struct smbios_entry_point);
}
/* Type 0 -- BIOS Information */
@@ -597,7 +555,7 @@ smbios_type_32_init(void *start)
}
/* Type 127 -- End of Table */
-void *
+static void *
smbios_type_127_init(void *start)
{
struct smbios_type_127 *p = (struct smbios_type_127 *)start;
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