i82371eb & qemu: Move to per-device ACPI.

This one is special because qemu is really far from anything real but
shares some common features.

Change-Id: Ia1631611724a074780e1fece50166730b2ee94ae
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/6939
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/arch/x86/boot/acpi.c

@@ -687,6 +687,11 @@ void acpi_create_fadt(acpi_fadt_t *fadt,acpi_facs_t *facs, void *dsdt)
 
 extern const unsigned char AmlCode[];
 
+unsigned long __attribute__ ((weak)) fw_cfg_acpi_tables(unsigned long start)
+{
+	return 0;
+}
+
 #define ALIGN_CURRENT current = (ALIGN(current, 16))
 unsigned long write_acpi_tables(unsigned long start)
 {
@@ -704,12 +709,17 @@ unsigned long write_acpi_tables(unsigned long start)
 	acpi_mcfg_t *mcfg;
 	acpi_madt_t *madt;
 	struct device *dev;
+	unsigned long fw;
 
 	current = start;
 
 	/* Align ACPI tables to 16byte */
 	ALIGN_CURRENT;
 
+	fw = fw_cfg_acpi_tables(current);
+	if (fw)
+		return fw;
+
 	printk(BIOS_INFO, "ACPI: Writing ACPI tables at %lx.\n", start);
 
 	/* We need at least an RSDP and an RSDT Table */

src/arch/x86/include/arch/acpi.h

@@ -482,6 +482,8 @@ typedef struct acpi_tstate {
 	u32 status;
 } __attribute__ ((packed)) acpi_tstate_t;
 
+unsigned long fw_cfg_acpi_tables(unsigned long start);
+
 /* These are implemented by the target port or north/southbridge. */
 unsigned long write_acpi_tables(unsigned long addr);
 unsigned long acpi_fill_madt(unsigned long current);