Rework the ISA PnP driver pnp and the PnP resource parser to fix

the following bugs.

- When constructing a resource configuration, respect the order
  in which resource descriptors are read, in order to establish
  the correct mapping between the descriptors and configuration
  registers.
  "Plug and Play ISA Specification, Version 1.0a", Sec 4.6.1, May 5,
  1994.  "Clarifications to the Plug and Play ISA Specification,
  Version 1.0a", Sec 6.2.1, Dec. 10, 1994.

- Do not ignore null (empty) descriptors; they are valid descriptors
  acting as filler.
  "Clarifications to the Plug and Play ISA Specification, Version 1.0a",
  Sec 6.2.1.

- Correctly set up logical device configuration registers for null
  resources.
  "Clarifications to the Plug and Play ISA Specification, Version 1.0a"

- Handle null resources properly in the resource allocator for the
  ISA bus.

1 files changed, 9 insertions, 1 deletions

diff --git a/sys/isa/pnpvar.h b/sys/isa/pnpvar.h
index 050adb9..012d3de 100644
--- a/sys/isa/pnpvar.h
+++ b/sys/isa/pnpvar.h
@@ -52,8 +52,16 @@ u_char  pnp_read(int d); /* currently unused, but who knows... */
 	 | (PNP_HEXTONUM(s[6]) << 24)		\
 	 | (PNP_HEXTONUM(s[5]) << 28))
 
+typedef int pnp_scan_cb(device_t dev, u_char tag, u_char *res, int len,
+			struct isa_config *config, int ldn);
+
 char *pnp_eisaformat(u_int32_t id);
-void pnp_parse_resources(device_t dev, u_char *resources, int len, u_int32_t vendor_id, u_int32_t logical_id, int ldn);
+void pnp_printf(u_int32_t id, char *fmt, ...);
+void pnp_parse_resources(device_t dev, u_char *resources, int len, int ldn);
+u_char *pnp_parse_dependant(device_t dev, u_char *resources, int len,
+			    struct isa_config *config, int ldn);
+u_char *pnp_scan_resources(device_t dev, u_char *resources, int len,
+			   struct isa_config *config, int ldn, pnp_scan_cb *cb);
 
 void pnp_check_quirks(u_int32_t vendor_id, u_int32_t logical_id, int ldn, struct isa_config *config);