static ACPI_TABLE_RSDP *
acpi_scan_rsd_ptr(void)
{
#if defined(__amd64__) || defined(__i386__)
ACPI_TABLE_RSDP *rsdp;
u_long addr, end;
/*
* On ia32, scan physical memory for the RSD PTR if above failed.
* According to section 5.2.2 of the ACPI spec, we only consider
* two regions for the base address:
* 1. EBDA (1 KB area addressed by the 16 bit pointer at 0x40E
* 2. High memory (0xE0000 - 0xFFFFF)
*/
addr = ACPI_EBDA_PTR_LOCATION;
pread(acpi_mem_fd, &addr, sizeof(uint16_t), addr);
addr <<= 4;
end = addr + ACPI_EBDA_WINDOW_SIZE;
for (; addr < end; addr += 16)
if ((rsdp = acpi_get_rsdp(addr)) != NULL)
return rsdp;
addr = ACPI_HI_RSDP_WINDOW_BASE;
end = addr + ACPI_HI_RSDP_WINDOW_SIZE;
for (; addr < end; addr += 16)
if ((rsdp = acpi_get_rsdp(addr)) != NULL)
return rsdp;
#endif /* __amd64__ || __i386__ */
return NULL;
}
/*
* 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);
}
