Kernel exports DSDP and apic_enabled in machine structure

- kernel exports DSDP (the root pointer where ACPI parsing starts) and
  apic_enabled in the machine structure.

- ACPI driver uses DSDP to locate ACPI in memory. acpi_enabled tell
  PCI driver to query ACPI for IRQ routing information.

include/minix/type.h

@@ -127,6 +127,8 @@ struct machine {
   int padding;	/* used to be protected */
   int vdu_ega;
   int vdu_vga;
+  int apic_enabled; /* does the kernel use APIC or not? */
+  phys_bytes	acpi_rsdp; /* where is the acpi RSDP */
 };
 
 struct io_range

kernel/arch/i386/acpi.c

@@ -247,15 +247,19 @@ PRIVATE int get_acpi_rsdp(void)
 	if (ebda) {
 		ebda <<= 4;
 		if(platform_tbl_ptr(ebda, ebda + 0x400, 16, &acpi_rsdp,
-					sizeof(acpi_rsdp), acpi_rsdp_test))
+					sizeof(acpi_rsdp), &machine.acpi_rsdp,
+					acpi_rsdp_test))
 			return 1;
 	} 
 
 	/* try BIOS read only mem space */
 	if(platform_tbl_ptr(0xE0000, 0x100000, 16, &acpi_rsdp,
-				sizeof(acpi_rsdp), acpi_rsdp_test))
+				sizeof(acpi_rsdp), &machine.acpi_rsdp,
+				acpi_rsdp_test))
 		return 1;
-
+	
+	machine.acpi_rsdp = 0; /* RSDP cannot be found at this address therefore
+				  it is a valid negative value */
 	return 0;
 }
 

kernel/arch/i386/memory.c

@@ -1089,14 +1089,18 @@ PUBLIC int platform_tbl_ptr(phys_bytes start,
 					unsigned increment,
 					void * buff,
 					unsigned size,
+					phys_bytes * phys_addr,
 					int ((* cmp_f)(void *)))
 {
 	phys_bytes addr;
 
 	for (addr = start; addr < end; addr += increment) {
 		phys_copy (addr, vir2phys(buff), size);
-		if (cmp_f(buff))
+		if (cmp_f(buff)) {
+			if (phys_addr)
+				*phys_addr = addr;
 			return 1;
+		}
 	}
 	return 0;
 }

kernel/arch/i386/proto.h

@@ -167,6 +167,7 @@ _PROTOTYPE(int platform_tbl_ptr, (phys_bytes start,
 					unsigned increment,
 					void * buff,
 					unsigned size,
+					phys_bytes * phys_addr,
 					int ((* cmp_f)(void *))));
 
 /* breakpoints.c */