added PCI expansion ROM support,

works for some ATI and Nvidia AGP cards now.


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1851 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/include/device/pci_rom.h

@@ -0,0 +1,32 @@
+#include <arch/byteorder.h>
+#include <stddef.h>
+
+#define PCI_ROM_HDR 0xAA55
+#define PCI_DATA_HDR (uint32_t) ( ('R' << 24) | ('I' << 16) | ('C' << 8) | 'P' )
+
+#define PCI_RAM_IMAGE_START 0xD0000
+#define PCI_VGA_RAM_IMAGE_START 0xC0000
+
+struct rom_header {
+	uint16_t	signature;
+	uint8_t		size;
+	uint8_t		init[3];
+	uint8_t		reserved[0x12];
+	uint16_t	data;
+};
+
+struct  pci_data {
+	uint32_t	signature;
+	uint16_t	vendor;
+	uint16_t	device;
+	uint16_t	reserved_1;
+	uint16_t	dlen;
+	uint8_t		drevision;
+	uint8_t		class_hi;
+	uint16_t	class_lo;
+	uint16_t	ilen;
+	uint16_t	irevision;
+	uint8_t		type;
+	uint8_t		indicator;
+	uint16_t	reserved_2;
+};