static void *
map_table(vm_paddr_t pa, int offset, const char *sig)
{
ACPI_TABLE_HEADER *header;
vm_offset_t length;
void *table;
header = pmap_mapbios(pa, sizeof(ACPI_TABLE_HEADER));
if (strncmp(header->Signature, sig, ACPI_NAME_SIZE) != 0) {
pmap_unmapbios((vm_offset_t)header, sizeof(ACPI_TABLE_HEADER));
return (NULL);
}
length = header->Length;
pmap_unmapbios((vm_offset_t)header, sizeof(ACPI_TABLE_HEADER));
table = pmap_mapbios(pa, length);
if (ACPI_FAILURE(AcpiTbChecksum(table, length))) {
if (bootverbose)
printf("ACPI: Failed checksum for table %s\n", sig);
#if (ACPI_CHECKSUM_ABORT)
pmap_unmapbios(table, length);
return (NULL);
#endif
}
return (table);
}
/* Unmap a table previously mapped via acpi_map_table(). */
void
acpi_unmap_table(void *table)
{
ACPI_TABLE_HEADER *header;
header = (ACPI_TABLE_HEADER *)table;
pmap_unmapbios((vm_offset_t)table, header->Length);
}
/*
* Free data structures allocated during acpi_pxm_init.
*/
void
acpi_pxm_free(void)
{
if (srat_physaddr == 0)
return;
pmap_unmapbios((vm_offset_t)cpus, sizeof(*cpus) * max_cpus);
srat_physaddr = 0;
cpus = NULL;
}
/*
* See if a given ACPI table is the requested table. Returns the
* length of the able if it matches or zero on failure.
*/
static int
probe_table(vm_paddr_t address, const char *sig)
{
ACPI_TABLE_HEADER *table;
table = pmap_mapbios(address, sizeof(ACPI_TABLE_HEADER));
if (table == NULL) {
if (bootverbose)
printf("ACPI: Failed to map table at 0x%jx\n",
(uintmax_t)address);
return (0);
}
if (bootverbose)
printf("Table '%.4s' at 0x%jx\n", table->Signature,
(uintmax_t)address);
if (strncmp(table->Signature, sig, ACPI_NAME_SIZE) != 0) {
pmap_unmapbios((vm_offset_t)table, sizeof(ACPI_TABLE_HEADER));
return (0);
}
pmap_unmapbios((vm_offset_t)table, sizeof(ACPI_TABLE_HEADER));
return (1);
}
/* Check BIOS date. If 1998 or older, disable ACPI. */
int
acpi_machdep_quirks(int *quirks)
{
char *va;
int year;
/* BIOS address 0xffff5 contains the date in the format mm/dd/yy. */
va = pmap_mapbios(0xffff0, 16);
sscanf(va + 11, "%2d", &year);
pmap_unmapbios((vm_offset_t)va, 16);
/*
* Date must be >= 1/1/1999 or we don't trust ACPI. Note that this
* check must be changed by my 114th birthday.
*/
if (year > 90 && year < 99)
*quirks = ACPI_Q_BROKEN;
return (0);
}
void
AcpiOsUnmapMemory(void *LogicalAddress, ACPI_SIZE Length)
{
pmap_unmapbios((vm_offset_t)LogicalAddress, Length);
}
/*
* Return the physical address of the requested table or zero if one
* is not found.
*/
vm_paddr_t
acpi_find_table(const char *sig)
{
ACPI_PHYSICAL_ADDRESS rsdp_ptr;
ACPI_TABLE_RSDP *rsdp;
ACPI_TABLE_XSDT *xsdt;
ACPI_TABLE_HEADER *table;
vm_paddr_t addr;
int i, count;
if (resource_disabled("acpi", 0))
return (0);
/*
* Map in the RSDP. Since ACPI uses AcpiOsMapMemory() which in turn
* calls pmap_mapbios() to find the RSDP, we assume that we can use
* pmap_mapbios() to map the RSDP.
*/
if ((rsdp_ptr = AcpiOsGetRootPointer()) == 0)
return (0);
rsdp = pmap_mapbios(rsdp_ptr, sizeof(ACPI_TABLE_RSDP));
if (rsdp == NULL) {
if (bootverbose)
printf("ACPI: Failed to map RSDP\n");
return (0);
}
addr = 0;
if (rsdp->Revision >= 2 && rsdp->XsdtPhysicalAddress != 0) {
/*
* AcpiOsGetRootPointer only verifies the checksum for
* the version 1.0 portion of the RSDP. Version 2.0 has
* an additional checksum that we verify first.
*/
if (AcpiTbChecksum((UINT8 *)rsdp, ACPI_RSDP_XCHECKSUM_LENGTH)) {
if (bootverbose)
printf("ACPI: RSDP failed extended checksum\n");
return (0);
}
xsdt = map_table(rsdp->XsdtPhysicalAddress, 2, ACPI_SIG_XSDT);
if (xsdt == NULL) {
if (bootverbose)
printf("ACPI: Failed to map XSDT\n");
pmap_unmapbios((vm_offset_t)rsdp,
sizeof(ACPI_TABLE_RSDP));
return (0);
}
count = (xsdt->Header.Length - sizeof(ACPI_TABLE_HEADER)) /
sizeof(UINT64);
for (i = 0; i < count; i++)
if (probe_table(xsdt->TableOffsetEntry[i], sig)) {
addr = xsdt->TableOffsetEntry[i];
break;
}
acpi_unmap_table(xsdt);
}
pmap_unmapbios((vm_offset_t)rsdp, sizeof(ACPI_TABLE_RSDP));
if (addr == 0) {
if (bootverbose)
printf("ACPI: No %s table found\n", sig);
return (0);
}
if (bootverbose)
printf("%s: Found table at 0x%jx\n", sig, (uintmax_t)addr);
/*
* Verify that we can map the full table and that its checksum is
* correct, etc.
*/
table = map_table(addr, 0, sig);
if (table == NULL)
return (0);
acpi_unmap_table(table);
return (addr);
}
