126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
/*
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* Dump DMI information in a way hopefully compatible with dmidecode
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "sysdump.h"
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struct dmi_header {
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char signature[5];
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uint8_t csum;
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uint16_t tbllen;
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uint32_t tbladdr;
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uint16_t nstruc;
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uint8_t revision;
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uint8_t reserved;
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};
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struct smbios_header {
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char signature[4];
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uint8_t csum;
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uint8_t len;
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uint8_t major;
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uint8_t minor;
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uint16_t maxsize;
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uint8_t revision;
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uint8_t fmt[5];
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struct dmi_header dmi;
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};
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static uint8_t checksum(const void *buf, size_t len)
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{
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const uint8_t *p = buf;
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uint8_t csum = 0;
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while (len--)
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csum += *p++;
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return csum;
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}
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static bool is_old_dmi(size_t dptr)
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{
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const struct dmi_header *dmi = (void *)dptr;
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return !memcmp(dmi->signature, "_DMI_", 5) &&
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!checksum(dmi, 0x0f);
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return false;
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}
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static bool is_smbios(size_t dptr)
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{
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const struct smbios_header *smb = (void *)dptr;
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return !memcmp(smb->signature, "_SM_", 4) &&
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!checksum(smb, smb->len) &&
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is_old_dmi(dptr+16);
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}
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static void dump_smbios(struct upload_backend *be, size_t dptr)
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{
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const struct smbios_header *smb = (void *)dptr;
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struct smbios_header smx = *smb;
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char filename[32];
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snprintf(filename, sizeof filename, "dmi/%05x.%08x",
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dptr, smb->dmi.tbladdr);
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cpio_hdr(be, MODE_FILE, smb->dmi.tbllen + 32, filename);
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/*
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* Adjust the address of the smbios table to be 32, to
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* make dmidecode happy. The checksum on the smbios table is unchanged,
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* since it includes the checksum on the dmi table.
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*/
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smx.dmi.tbladdr = sizeof smx;
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smx.dmi.csum -= checksum(&smx.dmi, 0x0f);
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write_data(be, &smx, sizeof smx);
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write_data(be, (const void *)smb->dmi.tbladdr, smb->dmi.tbllen);
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}
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static void dump_old_dmi(struct upload_backend *be, size_t dptr)
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{
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const struct dmi_header *dmi = (void *)dptr;
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struct fake {
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struct dmi_header dmi;
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char pad[16];
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} fake;
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char filename[32];
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snprintf(filename, sizeof filename, "dmi/%05x.%08x",
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dptr, dmi->tbladdr);
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cpio_hdr(be, MODE_FILE, dmi->tbllen + 32, filename);
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/*
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* Adjust the address of the smbios table to be 32, to
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* make dmidecode happy.
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*/
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fake.dmi = *dmi;
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memset(&fake.pad, 0, sizeof fake.pad);
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fake.dmi.tbladdr = sizeof fake;
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fake.dmi.csum -= checksum(&fake.dmi, 0x0f);
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write_data(be, &fake, sizeof fake);
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write_data(be, (const void *)dmi->tbladdr, dmi->tbllen);
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}
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void dump_dmi(struct upload_backend *be)
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{
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size_t dptr;
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cpio_mkdir(be, "dmi");
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/* Search for _SM_ or _DMI_ structure */
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for (dptr = 0xf0000 ; dptr < 0x100000 ; dptr += 16) {
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if (is_smbios(dptr)) {
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dump_smbios(be, dptr);
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dptr += 16; /* Skip the subsequent DMI header */
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} else if (is_old_dmi(dptr)) {
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dump_old_dmi(be, dptr);
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}
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}
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}
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