From: Al Stone ahs3@redhat.com
While trying to hunt down what appeared to be structural errors in an ACPI blob, I got tired of double checking pointers and load addresses by hand (and having to double check my lousy arithmetic). So, cab will search a blob for tables using brute force to determine where tables actually are, and then compare those locations with where all the table pointers say they should be, reporting any discrepancies found. Cab will also double check all table headers looking for invalid checksums, and table revision levels older than current ACPI 5.0 spec dictates.
If you can think of additional checks on tables, please add them.
Changes from v1: -- Clean up whitespace issues found by checkpatch
Signed-off-by: Al Stone al.stone@linaro.org --- Makefile | 7 +- tools/cab/Makefile | 8 + tools/cab/cab.c | 650 +++++++++++++++++++++++++++++++++++++++++++++++++++++ tools/cab/cab.h | 169 ++++++++++++++ 4 files changed, 833 insertions(+), 1 deletion(-) create mode 100644 tools/cab/Makefile create mode 100644 tools/cab/cab.c create mode 100644 tools/cab/cab.h
diff --git a/Makefile b/Makefile index e82376d..ef63965 100644 --- a/Makefile +++ b/Makefile @@ -1,14 +1,19 @@ MABDIR := tools/mab/ +CABDIR := tools/cab/ PLATDIR := platforms/
-%.acpi : $(MABDIR)/mab +%.acpi : $(MABDIR)/mab $(CABDIR)/cab make MAB=$(CURDIR)/$(MABDIR)/mab PADDR=$(PADDR) -C $(PLATDIR) $@
$(MABDIR)/mab : FORCE make -C $(MABDIR)
+$(CABDIR)/cab : FORCE + make -C $(CABDIR) + clean : make -C $(MABDIR) clean + make -C $(CABDIR) clean make -C $(PLATDIR) clean
FORCE : diff --git a/tools/cab/Makefile b/tools/cab/Makefile new file mode 100644 index 0000000..7d86b59 --- /dev/null +++ b/tools/cab/Makefile @@ -0,0 +1,8 @@ +CFLAGS := -g + +cab : cab.h cab.c + $(CC) $(CFLAGS) -o cab cab.c + +clean : + -rm -f cab cab.o + diff --git a/tools/cab/cab.c b/tools/cab/cab.c new file mode 100644 index 0000000..ebf5a83 --- /dev/null +++ b/tools/cab/cab.c @@ -0,0 +1,652 @@ +/* + * cab.c: main program for the tool to Check A Blob of ACPI tables + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file "COPYING" in the main directory of this + * archive for more details. + * + * Copyright (c) 2013, Al Stone al.stone@linaro.org + * + * NB: all values are assumed to be little-endian in the blob. + * + */ + +#include "cab.h" + +#include <sys/queue.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/mman.h> + +#include <ctype.h> +#include <endian.h> +#include <errno.h> +#include <fcntl.h> +#include <libgen.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +int passed; +int failed; + +void usage(void) +{ + printf("%s %s\n", PROGNAME, VERSION); + printf("usage: %s -b <blob> -p <paddr> [-q]\n", PROGNAME); + printf("\n"); + printf(" -b <blob> => file name of input ACPI blob\n"); + printf(" -p <paddr> => physical address used in relocation\n"); + printf(" -q => if given, supress output\n"); +} + +int get_file_size(char *fname) +{ + struct stat buf; + int err; + + err = stat(fname, &buf); + if (err) + printf("? cannot stat %s (%d)\n", fname, err); + return (err == 0 ? buf.st_size : 0); +} + +int valid_sig(char *sig) +{ + char **p; + + p = known_sigs; + while (*p != NULL) { + if (strncmp(*p, sig, strlen(*p)) == 0) + return 1; + p++; + } + return 0; +} + +struct table *build_table_entry(unsigned char *buf) +{ + struct table *tmp; + const int RSDP_NUDGE = 3; + int len; + + tmp = (struct table *)malloc(sizeof(struct table)); + if (tmp != NULL) { + memset(tmp, 0, sizeof(struct table)); + + /* fill in the struct */ + len = SIG_LENGTH + 1; + if (strncmp(buf, SIG_RSDP, SIG_LENGTH + RSDP_NUDGE) == 0) + len += RSDP_NUDGE; + tmp->signature = (char *)malloc(len); + memset(tmp->signature, 0, len); + memcpy(tmp->signature, buf, len - 1); + + LIST_INSERT_HEAD(&thead, tmp, tables); + } + + return tmp; +} + +struct table *find_table(char *sig) +{ + struct table *np; + + LIST_FOREACH(np, &thead, tables) { + if (strncmp(np->signature, sig, strlen(np->signature)) == 0) + return np; + } + return NULL; +} + +struct known_table_info *find_known_table_info(char *sig) +{ + struct known_table_info *np; + + for (np = known_info; np->signature != NULL; np++) { + if (strncmp(np->signature, sig, strlen(np->signature)) == 0) + return np; + } + return NULL; +} + +int verify_checksum(unsigned char *start, int offset, int len) +{ + uint8_t newsum, oldsum; + uint8_t *p; + uint8_t old_cksum, cksum; + + old_cksum = start[offset]; + cksum = old_cksum; + newsum = 0; + for (p = (uint8_t *)start; p < (uint8_t *)(start + len); p++) + newsum += *p; + + oldsum = cksum; + newsum = (uint8_t)(newsum - oldsum); + + cksum = (uint8_t)(0 - newsum); + + return (old_cksum == cksum ? PASS : FAIL); +} + +int verify_revision(unsigned char *r, int min) +{ + return (*(uint8_t *)r >= min ? PASS : FAIL); +} + +void presult(int res, char *topic) +{ + if (res != 0) + passed++; + else + failed++; + if (res >= 0) + printf("[%4s] %s\n", (res != 0) ? "PASS" : "FAIL", topic); + else + printf("[%4s] %s\n", "INFO", topic); +} + +void check_blob_header(unsigned char *blob) +{ + int res; + + printf("\nchecking blob header...\n"); + res = strncmp(blob, BLOB_MAGIC, BLOB_MAGIC_SIZE); + res = (res == 0 ? PASS : FAIL); + presult(res, "blob magic number is correct"); +} + +void check_table_header(char *name, unsigned char *loc) +{ + const int CHECKSUM_OFFSET = 9; + const int CREATOR_ID_OFFSET = 28; + const int CREATOR_ID_LEN = 4; + const int CREATOR_REV_OFFSET = 32; + const int CREATOR_REV_LEN = 4; + const int OEMID_OFFSET = 10; + const int OEMID_LEN = 6; + const int REVISION_OFFSET = 8; + + struct known_table_info *kp; + char buf[MAX_LINE]; + int res; + int offset; + uint32_t len; + int min; + + /* valid signature? */ + kp = find_known_table_info(name); + res = (kp ? PASS : FAIL); + memset(buf, 0, MAX_LINE); + sprintf(buf, "%s: signature is correct", name); + presult(res, buf); + + if (!kp) { + printf("? %s is an unknown table\n", name); + return; + } + + /* possibly usable length? */ + len = *(uint32_t *)(loc + TABLE_LEN_OFFSET); + res = PASS; + if ((len <= 0) || (len < MIN_TABLE_LENGTH)) + res = FAIL; + memset(buf, 0, MAX_LINE); + sprintf(buf, "%s: table length is reasonable (%d)", name, len); + presult(res, buf); + + /* valid checksum? */ + res = verify_checksum(loc, CHECKSUM_OFFSET, len); + memset(buf, 0, MAX_LINE); + sprintf(buf, "%s: checksum is correct", name); + presult(res, buf); + + /* valid revision number? */ + res = verify_revision(loc + REVISION_OFFSET, kp->min_revision); + memset(buf, 0, MAX_LINE); + sprintf(buf, "%s: minimum revision is correct", name); + presult(res, buf); + + /* non-empty OEMID field? */ + res = (loc[OEMID_OFFSET] != 0 ? PASS : FAIL); + memset(buf, 0, MAX_LINE); + sprintf(buf, "%s: there is an OEMID (", name); + strncat(buf, (unsigned char *)(loc + OEMID_OFFSET), OEMID_LEN); + strncat(buf, ")", 1); + presult(res, buf); + + /* non-empty CreatorID field? */ + res = (loc[CREATOR_ID_OFFSET] != 0 ? PASS : FAIL); + memset(buf, 0, MAX_LINE); + sprintf(buf, "%s: there is a CreatorID", name); + presult(res, buf); + + /* non-empty CreatorRevision field? */ + res = (loc[CREATOR_REV_OFFSET] != 0 ? PASS : FAIL); + memset(buf, 0, MAX_LINE); + sprintf(buf, "%s: there is a CreatorRevision", name); + presult(res, buf); +} + +void check_first_table_is_rsdp(unsigned char *blob) +{ + int res; + + res = strncmp(blob + BLOB_HEADER_SIZE, SIG_RSDP, strlen(SIG_RSDP)); + res = (res == 0 ? PASS : FAIL); + presult(res, "first table has RSDP signature"); +} + +void check_rsdp(unsigned char *blob) +{ + const int RSDP_FIRST_CKSUM_OFFSET = 8; + const int RSDP_FIRST_CKSUM_LEN = 20; + const int RSDP_SECOND_CKSUM_OFFSET = 32; + const int RSDP_SECOND_CKSUM_LEN = 36; + const int RSDP_RSDT_ADDR_OFFSET = 16; + + unsigned char *ptr; + int res; + uint32_t rsdt_addr; + + ptr = blob + BLOB_HEADER_SIZE; + printf("\nchecking RSDP...\n"); + check_first_table_is_rsdp(blob); + + res = verify_checksum(ptr, RSDP_FIRST_CKSUM_OFFSET, + RSDP_FIRST_CKSUM_LEN); + presult(res, "first RSDP checksum verified"); + + res = verify_checksum(ptr, RSDP_SECOND_CKSUM_OFFSET, + RSDP_SECOND_CKSUM_LEN); + presult(res, "second RSDP checksum verified"); + + rsdt_addr = *(uint32_t *)(ptr + RSDP_RSDT_ADDR_OFFSET); + res = (rsdt_addr == 0) ? PASS : FAIL; + presult(res, "RSDT address is null"); +} + +void find_all_tables(unsigned char *blob, int size, int base_addr) +{ + struct table *tp; + unsigned char *p; + int offset; + int delta; + + /* this assumes that all signatures and lengths are correct */ + printf("\nscanning for tables...\n"); + + p = blob + BLOB_HEADER_SIZE; + offset = (int)(p - blob); + + while (offset + SIG_LENGTH < size) { + if (valid_sig(p)) { + tp = build_table_entry(p); + if (tp) { + delta = TABLE_LEN_OFFSET; + if (strcmp(tp->signature, SIG_RSDP) == 0) + delta = RSDP_LEN_OFFSET; + tp->len = *(uint32_t *)(p + delta); + tp->offset = offset; + tp->paddr = base_addr + offset; + + offset += *(uint32_t *)(p + delta); + p += tp->len; + } else { + printf("? no room for building a table\n"); + exit(1); + } + } else { + /* skip forward until we find something; a table + * could have been moved to the next page boundary */ + while (offset + SIG_LENGTH < size) { + p++; + offset++; + if (isalpha(*p) && valid_sig(p)) + break; + } + } + } +} + +void check_rsdp_relocs(unsigned char *blob, int size, uint64_t paddr) +{ + const int RSDT_ADDR_OFFSET = 16; + const int XSDT_ADDR_OFFSET = 24; + + struct table *np, *xp; + int res; + uint32_t rsdt_addr; + uint64_t xsdt_addr; + + printf("\nchecking RSDP relocations...\n"); + + res = FAIL; + np = find_table(SIG_RSDP); + if (np) { + np->ref_cnt++; + + rsdt_addr = *(uint32_t *)(blob + np->offset + RSDT_ADDR_OFFSET); + res = (rsdt_addr == 0) ? PASS : FAIL; + presult(res, "RSDP has null RSDT pointer"); + + xsdt_addr = *(uint32_t *)(blob + np->offset + XSDT_ADDR_OFFSET); + xp = find_table(SIG_XSDT); + if (xp) { + xp->ref_cnt++; + if ((xsdt_addr == xp->paddr) && + (strncmp(blob + xp->offset, SIG_XSDT, + strlen(xp->signature)) == 0)) + res = PASS; + } + presult(res, "RSDP has correct XSDT pointer"); + } else { + res = FAIL; + presult(res, "RSDP has null RSDT pointer"); + presult(res, "RSDP has correct XSDT pointer"); + } +} + +void check_xsdt_relocs(unsigned char *blob, int size, uint64_t paddr) +{ + const int XSDT_ENTRY_START = 36; + const int XSDT_ENTRY_SIZE = 8; + + struct table *np, *xp; + int res; + int cnt; + int ii; + int offset; + uint32_t len; + uint64_t *tpaddr; + char buf[MAX_LINE]; + + printf("\nchecking XSDT relocations...\n"); + + res = FAIL; + np = find_table(SIG_XSDT); + if (np) { + len = *(uint32_t *)(blob + np->offset + TABLE_LEN_OFFSET); + cnt = (len - XSDT_ENTRY_START) / XSDT_ENTRY_SIZE; + tpaddr = (uint64_t *)(blob + np->offset + XSDT_ENTRY_START); + if (len < 1) { + printf("? XSDT can not have an empty list\n"); + exit(1); + } + + /* first entry needs to be the FACP (aka FADT) */ + offset = (*tpaddr - paddr); + if (strncmp(blob + offset, SIG_FACP, strlen(SIG_FACP)) == 0) + res = PASS; + presult(res, "first XSDT entry points to the FADT (aka FACP)"); + + /* verify all the relocations, best we can */ + for (ii = 0; ii < cnt; ii++, tpaddr++) { + offset = (*tpaddr - paddr); + res = FAIL; + if (valid_sig(blob + offset)) { + xp = find_table(blob + offset); + if (xp) { + xp->ref_cnt++; + if ((*tpaddr == xp->paddr) && + (strncmp(blob + xp->offset, + blob + offset, + strlen(xp->signature)) == 0)) + res = PASS; + memset(buf, 0, MAX_LINE); + sprintf(buf, + "XSDT has correct %s pointer", + xp->signature); + presult(res, buf); + } else { + memset(buf, 0, MAX_LINE); + sprintf(buf, + "XSDT entry %d does not point to a valid table", + ii); + presult(res, buf); + } + } + } + } else { + printf("? XSDT can not be found in table list\n"); + exit(1); + } +} + +void check_fadt_relocs(unsigned char *blob, int size, uint64_t paddr) +{ + const int FWCTL_OFFSET = 36; + const int DSDT_OFFSET = 40; + const int XFWCTL_OFFSET = 132; + const int XDSDT_OFFSET = 140; + + struct table *np, *xp; + uint32_t fwctl, dsdt; + uint64_t xfwctl, xdsdt; + uint64_t tpaddr; + int res; + int offset; + + printf("\nchecking FADT relocations...\n"); + np = find_table(SIG_FACP); + if (np) { + fwctl = *(uint32_t *)(blob + np->offset + FWCTL_OFFSET); + xfwctl = *(uint64_t *)(blob + np->offset + XFWCTL_OFFSET); + res = FAIL; + if ((fwctl == 0 && xfwctl == 0) || /* no FACS is okay */ + (fwctl == 0 && xfwctl != 0) || + (fwctl != 0 && xfwctl == 0)) + res = PASS; + presult(res, "FADT has a proper 32-bit FACS pointer"); + presult(res, "FADT has a proper 64-bit FACS pointer"); + if (fwctl != 0 && xfwctl != 0) + presult(INFO, + "both fields have been set, not just one"); + + if (fwctl != 0 || xfwctl != 0) { + tpaddr = (fwctl == 0) ? xfwctl : fwctl; + offset = tpaddr - paddr; + + xp = find_table(SIG_FACS); + if (xp) { + xp->ref_cnt++; + res = FAIL; + if ((tpaddr == xp->paddr) && + (strncmp(blob + xp->offset, + blob + offset, + strlen(xp->signature)) == 0)) + res = PASS; + presult(res, "FADT has correct FACS pointer"); + + } else { + printf("? FADT refers to an FACS but "); + printf("there is no such table\n"); + exit(1); + } + } + + dsdt = *(uint32_t *)(blob + np->offset + DSDT_OFFSET); + xdsdt = *(uint64_t *)(blob + np->offset + XDSDT_OFFSET); + res = FAIL; + if ((dsdt == 0 && xdsdt != 0) || /* must have a DSDT */ + (dsdt != 0 && xdsdt == 0)) + res = PASS; + presult(res, "FADT has a proper 32-bit DSDT pointer"); + presult(res, "FADT has a proper 64-bit DSDT pointer"); + if (dsdt != 0 && xdsdt != 0) + presult(INFO, + "both fields have been set, not just one"); + + if (dsdt != 0 || xdsdt != 0) { + tpaddr = (dsdt == 0) ? xdsdt : dsdt; + offset = tpaddr - paddr; + + xp = find_table(SIG_DSDT); + if (xp) { + xp->ref_cnt++; + res = FAIL; + if ((tpaddr == xp->paddr) && + (strncmp(blob + xp->offset, + blob + offset, + strlen(xp->signature)) == 0)) + res = PASS; + presult(res, "FADT has correct DSDT pointer"); + + } else { + printf("? FADT refers to a DSDT but "); + printf("there is no such table\n"); + exit(1); + } + } + + } else { + printf("? FADT (aka FACP) can not be found in table list\n"); + exit(1); + } +} + +void check_ref_cnts(void) +{ + struct table *np; + int res; + char buf[MAX_LINE]; + + printf("\nchecking references to tables...\n"); + LIST_FOREACH(np, &thead, tables) { + memset(buf, 0, MAX_LINE); + sprintf(buf, "%s referenced only once", np->signature); + res = (np->ref_cnt == 1) ? PASS : FAIL; + presult(res, buf); + } + +} + +void check_relocations(unsigned char *blob, int size, uint64_t paddr) +{ + check_rsdp_relocs(blob, size, paddr); + check_xsdt_relocs(blob, size, paddr); + check_fadt_relocs(blob, size, paddr); + check_ref_cnts(); +} + +int main(int argc, char *argv[]) +{ + int ii, jj; + int offset; + int delta; + int size; + int fd; + unsigned char *blob; + char *acpi_blob_name; + char *paddr_cmd; + uint64_t paddr = 0; + char sig[SIG_LENGTH]; + struct table *np; + int opt; + int quiet; + + /* parameter handling */ + acpi_blob_name = NULL; + paddr_cmd = NULL; + quiet = 0; + passed = 0; + failed = 0; + + while ((opt = getopt(argc, argv, "b:p:q")) != EOF) { + switch (opt) { + case 'b': + acpi_blob_name = optarg; + break; + case 'p': + paddr_cmd = optarg; + break; + case 'q': + quiet = 1; + break; + default: + usage(); + return 1; + } + } + + if (!quiet) + printf("%s %s\n", PROGNAME, VERSION); + + if ((argc > (optind + 1)) || (acpi_blob_name == NULL)) { + printf("? missing a parameter value\n"); + usage(); + return 1; + } + if (paddr_cmd) { + errno = 0; + paddr = strtoull(paddr_cmd, NULL, 0); + if (errno) { + printf("invalid physical address given\n"); + return 1; + } else { + printf("assume blob was relocated to 0x%llx\n", paddr); + } + } else { + printf("? missing required physical address parameter\n"); + usage(); + return 1; + } + + size = get_file_size(acpi_blob_name); + if (!size) { + printf("? blob cannot be zero length\n"); + exit(1); + } + + fd = open(acpi_blob_name, O_RDONLY); + if (fd < 0) { + perror(PROGNAME); + exit(1); + } + blob = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd , 0); + if (blob == MAP_FAILED) { + perror(PROGNAME); + exit(1); + } + + LIST_INIT(&thead); + + check_blob_header(blob); + check_rsdp(blob); + + find_all_tables(blob, size, paddr); + if (!quiet) { + printf("found the following tables....\n"); + ii = 0; + LIST_FOREACH(np, &thead, tables) { + printf( + "[%03d] %4s: %d bytes @ 0x%08x, loads @ 0x%016x\n", + ii, np->signature, np->len, np->offset, np->paddr); + ii++; + } + } + LIST_FOREACH(np, &thead, tables) { + if ((strncmp(np->signature, SIG_RSDP, + strlen(np->signature) != 0)) && + (strncmp(np->signature, SIG_FACS, + strlen(np->signature) != 0))) { + printf("\nchecking header of %s...\n", np->signature); + check_table_header(np->signature, blob + np->offset); + } + } + + check_relocations(blob, size, paddr); + + printf("\nTotal tests: %d\n", passed + failed); + printf("Passed: %d\n", passed); + printf("Failed: %d\n", failed); + printf("Success rate: %0.1f%\n", + (100.0 * (float)passed) / (float)(passed + failed)); + + munmap(blob, size); + + return (failed > 0) ? 1 : 0; +} diff --git a/tools/cab/cab.h b/tools/cab/cab.h new file mode 100644 index 0000000..4512757 --- /dev/null +++ b/tools/cab/cab.h @@ -0,0 +1,169 @@ +#ifndef _CAB_H +#define _CAB_H +/* + * cab.h: tool to Check A Blob of ACPI tables + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file "COPYING" in the main directory of this + * archive for more details. + * + * Copyright (c) 2013, Al Stone al.stone@linaro.org + * + * NB: all values are assumed to be little-endian in the blob. + * + */ + +#include <stdint.h> +#include <string.h> + +#include <sys/queue.h> + +/* VERSION a.b.c = <ACPI standard>.<functionality changes>.<bug fixes> */ +const char VERSION[] = { "5.0~3.1" }; +const char PROGNAME[] = { "cab" }; + +#define PASS 1 +#define FAIL 0 +#define INFO (-1) + +#define BLOB_HEADER_SIZE 8 +#define BLOB_MAGIC "ACPI" +#define BLOB_MAGIC_SIZE 4 +#define MAX_LINE 1024 +#define MIN_TABLE_LENGTH 36 +#define NOT_REQUIRED 0 +#define REQUIRED 1 +#define RSDP_LEN_OFFSET 20 +#define SIG_LENGTH 4 +#define TABLE_LEN_OFFSET 4 + +#define SIG_APIC "APIC" +#define SIG_BERT "BERT" +#define SIG_CPEP "CPEP" +#define SIG_DSDT "DSDT" +#define SIG_ECDT "ECDT" +#define SIG_EINJ "EINJ" +#define SIG_ERST "ERST" +#define SIG_FACP "FACP" +#define SIG_FACS "FACS" +#define SIG_FPDT "FPDT" +#define SIG_GTDT "GTDT" +#define SIG_HEST "HEST" +#define SIG_MCFG "MCFG" +#define SIG_MCHI "MCHI" +#define SIG_MPST "MPST" +#define SIG_MSCT "MSCT" +#define SIG_OEM "OEM" +#define SIG_PCCT "PCCT" +#define SIG_PMTT "PMTT" +#define SIG_RASF "RASF" +#define SIG_RSDP "RSD PTR" +#define SIG_RSDT "RSDT" +#define SIG_SLIT "SLIT" +#define SIG_SPMI "SPMI" +#define SIG_SRAT "SRAT" +#define SIG_SSDT "SSDT" +#define SIG_UEFI "UEFI" +#define SIG_XSDT "XSDT" + +struct known_table_info { + char *signature; /* table signature */ + int min_revision; /* minimum allowed revision */ +}; + +struct known_table_info known_info[] = { + { SIG_APIC, 3 }, + { SIG_BERT, 1 }, + { SIG_CPEP, 1 }, + { SIG_DSDT, 2 }, + { SIG_ECDT, 1 }, + { SIG_EINJ, 1 }, + { SIG_ERST, 1 }, + { SIG_FACP, 5 }, + { SIG_FACS, 5 }, + { SIG_FPDT, 1 }, + { SIG_GTDT, 1 }, + { SIG_HEST, 1 }, + { SIG_MCFG, 1 }, + { SIG_MCHI, 1 }, + { SIG_MPST, 1 }, + { SIG_MSCT, 1 }, + { SIG_OEM, 1 }, + { SIG_PMTT, 1 }, + { SIG_RASF, 1 }, + { SIG_RSDP, 2 }, + { SIG_RSDT, 1 }, + { SIG_SLIT, 1 }, + { SIG_SPMI, 1 }, + { SIG_SRAT, 3 }, + { SIG_SSDT, 2 }, + { SIG_UEFI, 1 }, + { SIG_XSDT, 1 }, + { NULL, 0 } +}; + +char *known_sigs[] = { + "APIC", + "BERT", + "CPEP", + "DSDT", + "ECDT", + "EINJ", + "ERST", + "FACP", + "FACS", + "FPDT", + "GTDT", + "HEST", + "MCFG", + "MCHI", + "MPST", + "MSCT", + "OEM", + "PCCT", + "PMTT", + "RASF", + "RSD PTR", + "SLIT", + "SPMI", + "SRAT", + "SSDT", + "UEFI", + "XSDT", + NULL +}; + +LIST_HEAD(table_head, table) thead; +struct table_head *theadp; + +struct table { + char *signature; /* an ACPI table name/signature */ + int len; /* reported table length */ + int offset; /* location in the blob */ + uint64_t paddr; /* where it should live in RAM */ + int ref_cnt; /* reference count */ + LIST_ENTRY(table) tables; +}; + + +struct table *build_table_entry(unsigned char *buf); +void check_blob_header(unsigned char *blob); +void check_fadt_relocs(unsigned char *blob, int size, uint64_t paddr); +void check_first_table_is_rsdp(unsigned char *blob); +void check_rsdp(unsigned char *blob); +void check_ref_cnts(void); +void check_relocations(unsigned char *blob, int size, uint64_t paddr); +void check_rsdp_relocs(unsigned char *blob, int size, uint64_t paddr); +void check_table_header(char *name, unsigned char *loc); +void check_xsdt_relocs(unsigned char *blob, int size, uint64_t paddr); +void find_all_tables(unsigned char *blob, int size, int base_addr); +struct known_table_info *find_known_table_info(char *sig); +struct table *find_table(char *sig); +int get_file_size(char *fname); +void usage(void); +int valid_sig(char *sig); +int verify_checksum(unsigned char *start, int offset, int len); +int verify_revision(unsigned char *r, int min); +void presult(int res, char *topic); + +#endif