/*
* Public interfaces
*/
ACPI_TABLE_RSDP *
acpi_find_rsd_ptr(void)
{
ACPI_TABLE_RSDP *rsdp;
char buf[20];
u_long addr;
size_t len;
acpi_user_init();
addr = 0;
/* Attempt to use kenv or sysctl to find RSD PTR record. */
if (kenv(KENV_GET, hint_acpi_0_rsdp, buf, 20) == 0)
addr = strtoul(buf, NULL, 0);
if (addr == 0) {
len = sizeof(addr);
if (sysctlbyname(machdep_acpi_root, &addr, &len, NULL, 0) != 0)
addr = 0;
}
if (addr != 0 && (rsdp = acpi_get_rsdp(addr)) != NULL)
return (rsdp);
return (acpi_scan_rsd_ptr());
}
int
acpi_detect(void)
{
struct ACPIrsdp *rp;
struct ACPIsdt *rsdp;
u_long addr;
size_t len;
if (!acpi0_present()) {
warnx("no acpi0 device located");
return -1;
}
acpi_user_init();
/* Attempt to use sysctl to find RSD PTR record. */
len = sizeof(addr);
if (sysctlbyname(machdep_acpi_root, &addr, &len, NULL, 0) != 0) {
warnx("cannot find ACPI information");
return -1;
}
rp = acpi_get_rsdp(addr);
if (rp == NULL) {
warnx("cannot find ACPI information: sysctl %s does not point to RSDP",
machdep_acpi_root);
return -1;
}
if (rp->revision < 2) {
rsdp = (struct ACPIsdt *)acpi_map_sdt(rp->rsdt_addr);
if (memcmp(rsdp->signature, "RSDT", 4) != 0 ||
acpi_checksum(rsdp, rsdp->len) != 0)
errx(1, "RSDT is corrupted");
addr_size = sizeof(uint32_t);
} else {
rsdp = (struct ACPIsdt *)acpi_map_sdt(rp->xsdt_addr);
if (memcmp(rsdp->signature, "XSDT", 4) != 0 ||
acpi_checksum(rsdp, rsdp->len) != 0)
errx(1, "XSDT is corrupted");
addr_size = sizeof(uint64_t);
}
ncpu = 0;
acpi_handle_rsdt(rsdp);
return (ncpu == 0 ? 1 : ncpu);
}
/*
* Public interfaces
*/
ACPI_TABLE_RSDP *
acpi_find_rsd_ptr(void)
{
int i;
uint8_t buf[sizeof(ACPI_TABLE_RSDP)];
acpi_user_init();
for (i = 0; i < 1024 * 1024; i += 16) {
read(acpi_mem_fd, buf, 16);
if (!memcmp(buf, "RSD PTR ", 8)) {
/* Read the rest of the structure */
read(acpi_mem_fd, buf + 16, sizeof(ACPI_TABLE_RSDP) - 16);
/* Verify checksum before accepting it. */
if (acpi_checksum(buf, sizeof(ACPI_TABLE_RSDP)))
continue;
return (acpi_map_physical(i, sizeof(ACPI_TABLE_RSDP)));
}
}
return acpi_scan_rsd_ptr();
}
