static struct ACPIsdt *
acpi_map_sdt(vm_offset_t pa)
{
struct ACPIsdt *sp;
sp = acpi_map_physical(pa, sizeof(struct ACPIsdt));
sp = acpi_map_physical(pa, sp->len);
return (sp);
}
static struct ACPIrsdp *
acpi_get_rsdp(u_long addr)
{
struct ACPIrsdp rsdp;
size_t len;
/* Read in the table signature and check it. */
pread(acpi_mem_fd, &rsdp, 8, addr);
if (memcmp(rsdp.signature, "RSD PTR ", 8))
return (NULL);
/* Read the entire table. */
pread(acpi_mem_fd, &rsdp, sizeof(rsdp), addr);
/* Run the checksum only over the version 1 header. */
if (acpi_checksum(&rsdp, 20))
return (NULL);
/* If the revision is 0, assume a version 1 length. */
if (rsdp.revision == 0)
len = 20;
else
len = rsdp.length;
/* XXX Should handle ACPI 2.0 RSDP extended checksum here. */
return (acpi_map_physical(addr, len));
}
static ACPI_TABLE_RSDP *
acpi_get_rsdp(u_long addr)
{
ACPI_TABLE_RSDP rsdp;
size_t len;
/* Read in the table signature and check it. */
pread(acpi_mem_fd, &rsdp, 8, addr);
if (memcmp(rsdp.Signature, "RSD PTR ", 8))
return (NULL);
/* Read the entire table. */
pread(acpi_mem_fd, &rsdp, sizeof(rsdp), addr);
/* Check the standard checksum. */
if (acpi_checksum(&rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0)
return (NULL);
/* Check extended checksum if table version >= 2. */
if (rsdp.Revision >= 2 &&
acpi_checksum(&rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0)
return (NULL);
/* If the revision is 0, assume a version 1 length. */
if (rsdp.Revision == 0)
len = ACPI_RSDP_REV0_SIZE;
else
len = rsdp.Length;
return (acpi_map_physical(addr, len));
}
/*
* 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();
}
