path: root/arch/ppc/syslib/prom_init.c

/*
 * Note that prom_init() and anything called from prom_init()
 * may be running at an address that is different from the address
 * that it was linked at.  References to static data items are
 * handled by compiling this file with -mrelocatable-lib.
 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/version.h>
#include <linux/threads.h>
#include <linux/spinlock.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/bitops.h>

#include <asm/sections.h>
#include <asm/prom.h>
#include <asm/page.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/bootx.h>
#include <asm/system.h>
#include <asm/mmu.h>
#include <asm/pgtable.h>
#include <asm/bootinfo.h>
#include <asm/btext.h>
#include <asm/pci-bridge.h>
#include <asm/open_pic.h>
#include <asm/cacheflush.h>

#ifdef CONFIG_LOGO_LINUX_CLUT224
#include <linux/linux_logo.h>
extern const struct linux_logo logo_linux_clut224;
#endif

/*
 * Properties whose value is longer than this get excluded from our
 * copy of the device tree.  This way we don't waste space storing
 * things like "driver,AAPL,MacOS,PowerPC" properties.  But this value
 * does need to be big enough to ensure that we don't lose things
 * like the interrupt-map property on a PCI-PCI bridge.
 */
#define MAX_PROPERTY_LENGTH	4096

#ifndef FB_MAX			/* avoid pulling in all of the fb stuff */
#define FB_MAX	8
#endif

#define ALIGNUL(x) (((x) + sizeof(unsigned long)-1) & -sizeof(unsigned long))

typedef u32 prom_arg_t;

struct prom_args {
	const char *service;
	int nargs;
	int nret;
	prom_arg_t args[10];
};

struct pci_address {
	unsigned a_hi;
	unsigned a_mid;
	unsigned a_lo;
};

struct pci_reg_property {
	struct pci_address addr;
	unsigned size_hi;
	unsigned size_lo;
};

struct pci_range {
	struct pci_address addr;
	unsigned phys;
	unsigned size_hi;
	unsigned size_lo;
};

struct isa_reg_property {
	unsigned space;
	unsigned address;
	unsigned size;
};

struct pci_intr_map {
	struct pci_address addr;
	unsigned dunno;
	phandle int_ctrler;
	unsigned intr;
};

static void prom_exit(void);
static int  call_prom(const char *service, int nargs, int nret, ...);
static int  call_prom_ret(const char *service, int nargs, int nret,
			  prom_arg_t *rets, ...);
static void prom_print_hex(unsigned int v);
static int  prom_set_color(ihandle ih, int i, int r, int g, int b);
static int  prom_next_node(phandle *nodep);
static unsigned long check_display(unsigned long mem);
static void setup_disp_fake_bi(ihandle dp);
static unsigned long copy_device_tree(unsigned long mem_start,
				unsigned long mem_end);
static unsigned long inspect_node(phandle node, struct device_node *dad,
				unsigned long mem_start, unsigned long mem_end,
				struct device_node ***allnextpp);
static void prom_hold_cpus(unsigned long mem);
static void prom_instantiate_rtas(void);
static void * early_get_property(unsigned long base, unsigned long node,
				char *prop);

prom_entry prom __initdata;
ihandle prom_chosen __initdata;
ihandle prom_stdout __initdata;

static char *prom_display_paths[FB_MAX] __initdata;
static phandle prom_display_nodes[FB_MAX] __initdata;
static unsigned int prom_num_displays __initdata;
static ihandle prom_disp_node __initdata;
char *of_stdout_device __initdata;

unsigned int rtas_data;   /* physical pointer */
unsigned int rtas_entry;  /* physical pointer */
unsigned int rtas_size;
unsigned int old_rtas;

boot_infos_t *boot_infos;
char *bootpath;
char *bootdevice;
struct device_node *allnodes;

extern char *klimit;

static void __init
prom_exit(void)
{
	struct prom_args args;

	args.service = "exit";
	args.nargs = 0;
	args.nret = 0;
	prom(&args);
	for (;;)			/* should never get here */
		;
}

static int __init
call_prom(const char *service, int nargs, int nret, ...)
{
	va_list list;
	int i;
	struct prom_args prom_args;

	prom_args.service = service;
	prom_args.nargs = nargs;
	prom_args.nret = nret;
	va_start(list, nret);
	for (i = 0<