#include "pc.h"
#include "acpi.h"
-struct acpi_table_header
-{
- char signature [4]; /* ACPI signature (4 ASCII characters) */
+struct acpi_table_header {
+ uint16_t _length; /* our length, not actual part of the hdr */
+ /* XXX why we have 2 length fields here? */
+ char sig[4]; /* ACPI signature (4 ASCII characters) */
uint32_t length; /* Length of table, in bytes, including header */
uint8_t revision; /* ACPI Specification minor version # */
uint8_t checksum; /* To make sum of entire table == 0 */
- char oem_id [6]; /* OEM identification */
- char oem_table_id [8]; /* OEM table identification */
+ char oem_id[6]; /* OEM identification */
+ char oem_table_id[8]; /* OEM table identification */
uint32_t oem_revision; /* OEM revision number */
- char asl_compiler_id [4]; /* ASL compiler vendor ID */
+ char asl_compiler_id[4]; /* ASL compiler vendor ID */
uint32_t asl_compiler_revision; /* ASL compiler revision number */
} __attribute__((packed));
+#define ACPI_TABLE_HDR_SIZE sizeof(struct acpi_table_header)
+#define ACPI_TABLE_PFX_SIZE sizeof(uint16_t) /* size of the extra prefix */
+
+static const char dfl_hdr[ACPI_TABLE_HDR_SIZE] =
+ "\0\0" /* fake _length (2) */
+ "QEMU\0\0\0\0\1\0" /* sig (4), len(4), revno (1), csum (1) */
+ "QEMUQEQEMUQEMU\1\0\0\0" /* OEM id (6), table (8), revno (4) */
+ "QEMU\1\0\0\0" /* ASL compiler ID (4), version (4) */
+ ;
+
char *acpi_tables;
size_t acpi_tables_len;
{
int sum, i;
sum = 0;
- for(i = 0; i < len; i++)
+ for (i = 0; i < len; i++) {
sum += data[i];
+ }
return (-sum) & 0xff;
}
+/* like strncpy() but zero-fills the tail of destination */
+static void strzcpy(char *dst, const char *src, size_t size)
+{
+ size_t len = strlen(src);
+ if (len >= size) {
+ len = size;
+ } else {
+ memset(dst + len, 0, size - len);
+ }
+ memcpy(dst, src, len);
+}
+
+/* XXX fixme: this function uses obsolete argument parsing interface */
int acpi_table_add(const char *t)
{
- static const char *dfl_id = "QEMUQEMU";
char buf[1024], *p, *f;
- struct acpi_table_header acpi_hdr;
unsigned long val;
- uint32_t length;
- struct acpi_table_header *acpi_hdr_p;
- size_t off;
+ size_t len, start, allen;
+ bool has_header;
+ int changed;
+ int r;
+ struct acpi_table_header hdr;
+
+ r = 0;
+ r |= get_param_value(buf, sizeof(buf), "data", t) ? 1 : 0;
+ r |= get_param_value(buf, sizeof(buf), "file", t) ? 2 : 0;
+ switch (r) {
+ case 0:
+ buf[0] = '\0';
+ /* fallthrough for default behavior */
+ case 1:
+ has_header = false;
+ break;
+ case 2:
+ has_header = true;
+ break;
+ default:
+ fprintf(stderr, "acpitable: both data and file are specified\n");
+ return -1;
+ }
- memset(&acpi_hdr, 0, sizeof(acpi_hdr));
-
- if (get_param_value(buf, sizeof(buf), "sig", t)) {
- strncpy(acpi_hdr.signature, buf, 4);
+ if (!acpi_tables) {
+ allen = sizeof(uint16_t);
+ acpi_tables = qemu_mallocz(allen);
} else {
- strncpy(acpi_hdr.signature, dfl_id, 4);
+ allen = acpi_tables_len;
}
+
+ start = allen;
+ acpi_tables = qemu_realloc(acpi_tables, start + ACPI_TABLE_HDR_SIZE);
+ allen += has_header ? ACPI_TABLE_PFX_SIZE : ACPI_TABLE_HDR_SIZE;
+
+ /* now read in the data files, reallocating buffer as needed */
+
+ for (f = strtok(buf, ":"); f; f = strtok(NULL, ":")) {
+ int fd = open(f, O_RDONLY);
+
+ if (fd < 0) {
+ fprintf(stderr, "can't open file %s: %s\n", f, strerror(errno));
+ return -1;
+ }
+
+ for (;;) {
+ char data[8192];
+ r = read(fd, data, sizeof(data));
+ if (r == 0) {
+ break;
+ } else if (r > 0) {
+ acpi_tables = qemu_realloc(acpi_tables, allen + r);
+ memcpy(acpi_tables + allen, data, r);
+ allen += r;
+ } else if (errno != EINTR) {
+ fprintf(stderr, "can't read file %s: %s\n",
+ f, strerror(errno));
+ close(fd);
+ return -1;
+ }
+ }
+
+ close(fd);
+ }
+
+ /* now fill in the header fields */
+
+ f = acpi_tables + start; /* start of the table */
+ changed = 0;
+
+ /* copy the header to temp place to align the fields */
+ memcpy(&hdr, has_header ? f : dfl_hdr, ACPI_TABLE_HDR_SIZE);
+
+ /* length of the table minus our prefix */
+ len = allen - start - ACPI_TABLE_PFX_SIZE;
+
+ hdr._length = cpu_to_le16(len);
+
+ if (get_param_value(buf, sizeof(buf), "sig", t)) {
+ strzcpy(hdr.sig, buf, sizeof(hdr.sig));
+ ++changed;
+ }
+
+ /* length of the table including header, in bytes */
+ if (has_header) {
+ /* check if actual length is correct */
+ val = le32_to_cpu(hdr.length);
+ if (val != len) {
+ fprintf(stderr,
+ "warning: acpitable has wrong length,"
+ " header says %lu, actual size %zu bytes\n",
+ val, len);
+ ++changed;
+ }
+ }
+ /* we may avoid putting length here if has_header is true */
+ hdr.length = cpu_to_le32(len);
+
if (get_param_value(buf, sizeof(buf), "rev", t)) {
- val = strtoul(buf, &p, 10);
- if (val > 255 || *p != '\0')
- goto out;
- } else {
- val = 1;
+ val = strtoul(buf, &p, 0);
+ if (val > 255 || *p) {
+ fprintf(stderr, "acpitable: \"rev=%s\" is invalid\n", buf);
+ return -1;
+ }
+ hdr.revision = (uint8_t)val;
+ ++changed;
}
- acpi_hdr.revision = (int8_t)val;
if (get_param_value(buf, sizeof(buf), "oem_id", t)) {
- strncpy(acpi_hdr.oem_id, buf, 6);
- } else {
- strncpy(acpi_hdr.oem_id, dfl_id, 6);
+ strzcpy(hdr.oem_id, buf, sizeof(hdr.oem_id));
+ ++changed;
}
if (get_param_value(buf, sizeof(buf), "oem_table_id", t)) {
- strncpy(acpi_hdr.oem_table_id, buf, 8);
- } else {
- strncpy(acpi_hdr.oem_table_id, dfl_id, 8);
+ strzcpy(hdr.oem_table_id, buf, sizeof(hdr.oem_table_id));
+ ++changed;
}
if (get_param_value(buf, sizeof(buf), "oem_rev", t)) {
- val = strtol(buf, &p, 10);
- if(*p != '\0')
- goto out;
- } else {
- val = 1;
+ val = strtol(buf, &p, 0);
+ if (*p) {
+ fprintf(stderr, "acpitable: \"oem_rev=%s\" is invalid\n", buf);
+ return -1;
+ }
+ hdr.oem_revision = cpu_to_le32(val);
+ ++changed;
}
- acpi_hdr.oem_revision = cpu_to_le32(val);
if (get_param_value(buf, sizeof(buf), "asl_compiler_id", t)) {
- strncpy(acpi_hdr.asl_compiler_id, buf, 4);
- } else {
- strncpy(acpi_hdr.asl_compiler_id, dfl_id, 4);
+ strzcpy(hdr.asl_compiler_id, buf, sizeof(hdr.asl_compiler_id));
+ ++changed;
}
if (get_param_value(buf, sizeof(buf), "asl_compiler_rev", t)) {
- val = strtol(buf, &p, 10);
- if(*p != '\0')
- goto out;
- } else {
- val = 1;
- }
- acpi_hdr.asl_compiler_revision = cpu_to_le32(val);
-
- if (!get_param_value(buf, sizeof(buf), "data", t)) {
- buf[0] = '\0';
- }
-
- length = sizeof(acpi_hdr);
-
- f = buf;
- while (buf[0]) {
- struct stat s;
- char *n = strchr(f, ':');
- if (n)
- *n = '\0';
- if(stat(f, &s) < 0) {
- fprintf(stderr, "Can't stat file '%s': %s\n", f, strerror(errno));
- goto out;
+ val = strtol(buf, &p, 0);
+ if (*p) {
+ fprintf(stderr, "acpitable: \"%s=%s\" is invalid\n",
+ "asl_compiler_rev", buf);
+ return -1;
}
- length += s.st_size;
- if (!n)
- break;
- *n = ':';
- f = n + 1;
+ hdr.asl_compiler_revision = cpu_to_le32(val);
+ ++changed;
}
- if (!acpi_tables) {
- acpi_tables_len = sizeof(uint16_t);
- acpi_tables = qemu_mallocz(acpi_tables_len);
+ if (!has_header && !changed) {
+ fprintf(stderr, "warning: acpitable: no table headers are specified\n");
}
- acpi_tables = qemu_realloc(acpi_tables,
- acpi_tables_len + sizeof(uint16_t) + length);
- p = acpi_tables + acpi_tables_len;
- acpi_tables_len += sizeof(uint16_t) + length;
-
- *(uint16_t*)p = cpu_to_le32(length);
- p += sizeof(uint16_t);
- memcpy(p, &acpi_hdr, sizeof(acpi_hdr));
- off = sizeof(acpi_hdr);
-
- f = buf;
- while (buf[0]) {
- struct stat s;
- int fd;
- char *n = strchr(f, ':');
- if (n)
- *n = '\0';
- fd = open(f, O_RDONLY);
-
- if(fd < 0)
- goto out;
- if(fstat(fd, &s) < 0) {
- close(fd);
- goto out;
- }
- /* off < length is necessary because file size can be changed
- under our foot */
- while(s.st_size && off < length) {
- int r;
- r = read(fd, p + off, s.st_size);
- if (r > 0) {
- off += r;
- s.st_size -= r;
- } else if ((r < 0 && errno != EINTR) || r == 0) {
- close(fd);
- goto out;
- }
- }
- close(fd);
- if (!n)
- break;
- f = n + 1;
- }
- if (off < length) {
- /* don't pass random value in process to guest */
- memset(p + off, 0, length - off);
+ /* now calculate checksum of the table, complete with the header */
+ /* we may as well leave checksum intact if has_header is true */
+ /* alternatively there may be a way to set cksum to a given value */
+ hdr.checksum = 0; /* for checksum calculation */
+
+ /* put header back */
+ memcpy(f, &hdr, sizeof(hdr));
+
+ if (changed || !has_header || 1) {
+ ((struct acpi_table_header *)f)->checksum =
+ acpi_checksum((uint8_t *)f + ACPI_TABLE_PFX_SIZE, len);
}
- acpi_hdr_p = (struct acpi_table_header*)p;
- acpi_hdr_p->length = cpu_to_le32(length);
- acpi_hdr_p->checksum = acpi_checksum((uint8_t*)p, length);
/* increase number of tables */
- (*(uint16_t*)acpi_tables) =
- cpu_to_le32(le32_to_cpu(*(uint16_t*)acpi_tables) + 1);
+ (*(uint16_t *)acpi_tables) =
+ cpu_to_le32(le32_to_cpu(*(uint16_t *)acpi_tables) + 1);
+
+ acpi_tables_len = allen;
return 0;
-out:
- if (acpi_tables) {
- qemu_free(acpi_tables);
- acpi_tables = NULL;
- }
- return -1;
+
}
/* ACPI PM1a EVT */
projects / sdk / emulator / qemu.git / commitdiff