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* Copyright (c) 2004, 2008 IBM Corporation
* Copyright (c) 2008, 2009 Pattrick Hueper <>
* All rights reserved.
* This program and the accompanying materials
* are made available under the terms of the BSD License
* which accompanies this distribution, and is available at
* Contributors:
* IBM Corporation - initial implementation
#ifndef DEVICE_LIB_H
#define DEVICE_LIB_H
#include <types.h>
#include <endian.h>
#include "compat/of.h"
#include "debug.h"
// a Expansion Header Struct as defined in Plug and Play BIOS Spec 1.0a Chapter 3.2
typedef struct {
char signature[4]; // signature
u8 structure_revision;
u8 length; // in 16 byte blocks
u16 next_header_offset; // offset to next Expansion Header as 16bit little-endian value, as offset from the start of the Expansion ROM
u8 reserved;
u8 checksum; // the sum of all bytes of the Expansion Header must be 0
u32 device_id; // PnP Device ID as 32bit little-endian value
u16 p_manufacturer_string; //16bit little-endian offset from start of Expansion ROM
u16 p_product_string; //16bit little-endian offset from start of Expansion ROM
u8 device_base_type;
u8 device_sub_type;
u8 device_if_type;
u8 device_indicators;
// the following vectors are all 16bit little-endian offsets from start of Expansion ROM
u16 bcv; // Boot Connection Vector
u16 dv; // Disconnect Vector
u16 bev; // Bootstrap Entry Vector
u16 reserved_2;
u16 sriv; // Static Resource Information Vector
} __attribute__ ((__packed__)) exp_header_struct_t;
// a PCI Data Struct as defined in PCI 2.3 Spec Chapter
typedef struct {
u8 signature[4]; // signature, the String "PCIR"
u16 vendor_id;
u16 device_id;
u16 reserved;
u16 pci_ds_length; // PCI Data Structure Length, 16bit little-endian value
u8 pci_ds_revision;
u8 class_code[3];
u16 img_length; // length of the Exp.ROM Image, 16bit little-endian value in 512 bytes
u16 img_revision;
u8 code_type;
u8 indicator;
u16 reserved_2;
} __attribute__ ((__packed__)) pci_data_struct_t;
typedef struct {
u8 bus;
u8 devfn;
struct device* dev;
u64 puid;
phandle_t phandle;
ihandle_t ihandle;
// store the address of the BAR that is used to simulate
// legacy VGA memory accesses
u64 vmem_addr;
u64 vmem_size;
// used to buffer I/O Accesses, that do not access the I/O Range of the device...
// 64k might be overkill, but we can buffer all I/O accesses...
u8 io_buffer[64 * 1024];
u16 pci_vendor_id;
u16 pci_device_id;
// translated address of the "PC-Compatible" Expansion ROM Image for this device
unsigned long img_addr;
u32 img_size; // size of the Expansion ROM Image (read from the PCI Data Structure)
} biosemu_device_t;
typedef struct {
unsigned long info;
u8 info;
u8 bus;
u8 devfn;
u8 cfg_space_offset;
u64 address;
u64 address_offset;
u64 size;
} __attribute__ ((__packed__)) translate_address_t;
// array to store address translations for this
// device. Needed for faster address translation, so
// not every I/O or Memory Access needs to call translate_address_dev
// and access the device tree
// 6 BARs, 1 Exp. ROM, 1 Cfg.Space, and 3 Legacy, plus 2 "special"
// translations are supported... this should be enough for
// most devices... for VGA it is enough anyways...
extern translate_address_t translate_address_array[13];
// index of last translate_address_array entry
// set by get_dev_addr_info function
extern u8 taa_last_entry;
// add 1:1 mapped memory regions to translation table
void biosemu_add_special_memory(u32 start, u32 size);
/* the device we are working with... */
extern biosemu_device_t bios_device;
u8 biosemu_dev_init(struct device * device);
// NOTE: for dev_check_exprom to work, biosemu_dev_init MUST be called first!
u8 biosemu_dev_check_exprom(unsigned long rom_base_addr);
u8 biosemu_dev_translate_address(int type, unsigned long * addr);
/* endianness swap functions for 16 and 32 bit words
* copied from axon_pciconfig.c
static inline void
out32le(void *addr, u32 val)
*((u32*) addr) = cpu_to_le32(val);
asm volatile ("stwbrx %0, 0, %1"::"r" (val), "r"(addr));
static inline u32
in32le(void *addr)
u32 val;
val = cpu_to_le32(*((u32 *) addr));
asm volatile ("lwbrx %0, 0, %1":"=r" (val):"r"(addr));
return val;
static inline void
out16le(void *addr, u16 val)
*((u16*) addr) = cpu_to_le16(val);
asm volatile ("sthbrx %0, 0, %1"::"r" (val), "r"(addr));
static inline u16
in16le(void *addr)
u16 val;
val = cpu_to_le16(*((u16*) addr));
asm volatile ("lhbrx %0, 0, %1":"=r" (val):"r"(addr));
return val;
/* debug function, dumps HID1 and HID4 to detect whether caches are on/off */
static inline void
u64 hid;
//HID1 = 1009
__asm__ __volatile__("mfspr %0, 1009":"=r"(hid));
printf("HID1: %016llx\n", hid);
//HID4 = 1012
__asm__ __volatile__("mfspr %0, 1012":"=r"(hid));
printf("HID4: %016llx\n", hid);