Extract the code to find and map the MADT ACPI table during early kernel

startup and genericize it so it can be reused to map other tables as well:
- Add a routine to walk a list of ACPI subtables such as those used in the
  APIC and SRAT tables in the MI acpi(4) driver.
- Move the routines for mapping and unmapping an ACPI table as well as
  mapping the RSDT or XSDT and searching for a table with a given signature
  out into acpica_machdep.c for both amd64 and i386.

1 files changed, 5 insertions, 0 deletions

diff --git a/sys/dev/acpica/acpivar.h b/sys/dev/acpica/acpivar.h
index 63eadea..f4d27e4 100644
--- a/sys/dev/acpica/acpivar.h
+++ b/sys/dev/acpica/acpivar.h
@@ -307,6 +307,9 @@ void		acpi_EnterDebugger(void);
 	ACPI_DEVINFO_PRESENT(x, ACPI_STA_PRESENT | ACPI_STA_FUNCTIONAL | \
 	    ACPI_STA_BATT_PRESENT)
 
+/* Callback function type for walking subtables within a table. */
+typedef void acpi_subtable_handler(ACPI_SUBTABLE_HEADER *, void *);
+
 BOOLEAN		acpi_DeviceIsPresent(device_t dev);
 BOOLEAN		acpi_BatteryIsPresent(device_t dev);
 ACPI_STATUS	acpi_GetHandleInScope(ACPI_HANDLE parent, char *path,
@@ -340,6 +343,8 @@ void		acpi_UserNotify(const char *subsystem, ACPI_HANDLE h,
 int		acpi_bus_alloc_gas(device_t dev, int *type, int *rid,
 		    ACPI_GENERIC_ADDRESS *gas, struct resource **res,
 		    u_int flags);
+void		acpi_walk_subtables(void *first, void *end,
+		    acpi_subtable_handler *handler, void *arg);
 
 struct acpi_parse_resource_set {
     void	(*set_init)(device_t dev, void *arg, void **context);