arch/x86/acpigen: Add function to write a CPU package

Emits a list of CPU cores, e.g.

  Name (PPKG, Package (2) { \_PR.CP00, \_PR.CP01 })

Tested on Lenovo Thinkpad T500.

Change-Id: I10e9ebad84343d1fb282b3fbb28f5f014f664f14
Signed-off-by: Nico Huber <nico.h@gmx.de>
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/21324
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/arch/x86/acpigen.c

@@ -353,6 +353,22 @@ void acpigen_write_processor(u8 cpuindex, u32 pblock_addr, u8 pblock_len)
 	acpigen_emit_byte(pblock_len);
 }
 
+void acpigen_write_processor_package(const char *const name,
+				     const unsigned int first_core,
+				     const unsigned int core_count)
+{
+	unsigned int i;
+	char pscope[16];
+
+	acpigen_write_name(name);
+	acpigen_write_package(core_count);
+	for (i = first_core; i < first_core + core_count; ++i) {
+		snprintf(pscope, sizeof(pscope), CONFIG_ACPI_CPU_STRING, i);
+		acpigen_emit_namestring(pscope);
+	}
+	acpigen_pop_len();
+}
+
 /*
  * Generate ACPI AML code for OperationRegion
  * Arg0: Pointer to struct opregion opreg = OPREGION(rname, space, offset, len)

src/arch/x86/include/arch/acpigen.h

@@ -219,6 +219,9 @@ typedef enum { CSD_HW_ALL = 0xfe } CSD_coord;
 void acpigen_write_CSD_package(u32 domain, u32 numprocs, CSD_coord coordtype,
 				u32 index);
 void acpigen_write_processor(u8 cpuindex, u32 pblock_addr, u8 pblock_len);
+void acpigen_write_processor_package(const char *name,
+				     unsigned int first_core,
+				     unsigned int core_count);
 void acpigen_write_TSS_package(int entries, acpi_tstate_t *tstate_list);
 void acpigen_write_TSD_package(u32 domain, u32 numprocs, PSD_coord coordtype);
 void acpigen_write_mem32fixed(int readwrite, u32 base, u32 size);