prom_init.c

linux-2.6.15.6

	/* Search all nodes looking for PHBs. */
	for (node = 0; prom_next_node(&node); ) {
		compatible[0] = 0;
		type[0] = 0;
		model[0] = 0;
		prom_getprop(node, "compatible",
			     compatible, sizeof(compatible));
		prom_getprop(node, "device_type", type, sizeof(type));
		prom_getprop(node, "model", model, sizeof(model));

		if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL))
			continue;

		/* Keep the old logic in tack to avoid regression. */
		if (compatible[0] != 0) {
			if ((strstr(compatible, RELOC("python")) == NULL) &&
			    (strstr(compatible, RELOC("Speedwagon")) == NULL) &&
			    (strstr(compatible, RELOC("Winnipeg")) == NULL))
				continue;
		} else if (model[0] != 0) {
			if ((strstr(model, RELOC("ython")) == NULL) &&
			    (strstr(model, RELOC("peedwagon")) == NULL) &&
			    (strstr(model, RELOC("innipeg")) == NULL))
				continue;
		}

		if (prom_getprop(node, "tce-table-minalign", &minalign,
				 sizeof(minalign)) == PROM_ERROR)
			minalign = 0;
		if (prom_getprop(node, "tce-table-minsize", &minsize,
				 sizeof(minsize)) == PROM_ERROR)
			minsize = 4UL << 20;

		/*
		 * Even though we read what OF wants, we just set the table
		 * size to 4 MB.  This is enough to map 2GB of PCI DMA space.
		 * By doing this, we avoid the pitfalls of trying to DMA to
		 * MMIO space and the DMA alias hole.
		 *
		 * On POWER4, firmware sets the TCE region by assuming
		 * each TCE table is 8MB. Using this memory for anything
		 * else will impact performance, so we always allocate 8MB.
		 * Anton
		 */
		if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p))
			minsize = 8UL << 20;
		else
			minsize = 4UL << 20;

		/* Align to the greater of the align or size */
		align = max(minalign, minsize);
		base = alloc_down(minsize, align, 1);
		if (base == 0)
			prom_panic("ERROR, cannot find space for TCE table.\n");
		if (base < local_alloc_bottom)
			local_alloc_bottom = base;

		/* It seems OF doesn't null-terminate the path :-( */
		memset(path, 0, sizeof(path));
		/* Call OF to setup the TCE hardware */
		if (call_prom("package-to-path", 3, 1, node,
			      path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
			prom_printf("package-to-path failed\n");
		}

		/* Save away the TCE table attributes for later use. */
		prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
		prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));

		prom_debug("TCE table: %s\n", path);
		prom_debug("\tnode = 0x%x\n", node);
		prom_debug("\tbase = 0x%x\n", base);
		prom_debug("\tsize = 0x%x\n", minsize);

		/* Initialize the table to have a one-to-one mapping
		 * over the allocated size.
		 */
		tce_entryp = (unsigned long *)base;
		for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
			tce_entry = (i << PAGE_SHIFT);
			tce_entry |= 0x3;
			*tce_entryp = tce_entry;
		}

		prom_printf("opening PHB %s", path);
		phb_node = call_prom("open", 1, 1, path);
		if (phb_node == 0)
			prom_printf("... failed\n");
		else
			prom_printf("... done\n");

		call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
			  phb_node, -1, minsize,
			  (u32) base, (u32) (base >> 32));
		call_prom("close", 1, 0, phb_node);
	}

	reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);

	if (RELOC(prom_memory_limit)) {
		/*
		 * We align the start to a 16MB boundary so we can map
		 * the TCE area using large pages if possible.
		 * The end should be the top of RAM so no need to align it.
		 */
		RELOC(prom_tce_alloc_start) = _ALIGN_DOWN(local_alloc_bottom,
							  0x1000000);
		RELOC(prom_tce_alloc_end) = local_alloc_top;
	}

	/* Flag the first invalid entry */
	prom_debug("ending prom_initialize_tce_table\n");
}
#endif

/*
 * With CHRP SMP we need to use the OF to start the other processors.
 * We can't wait until smp_boot_cpus (the OF is trashed by then)
 * so we have to put the processors into a holding pattern controlled
 * by the kernel (not OF) before we destroy the OF.
 *
 * This uses a chunk of low memory, puts some holding pattern
 * code there and sends the other processors off to there until
 * smp_boot_cpus tells them to do something.  The holding pattern
 * checks that address until its cpu # is there, when it is that
 * cpu jumps to __secondary_start().  smp_boot_cpus() takes care
 * of setting those values.
 *
 * We also use physical address 0x4 here to tell when a cpu
 * is in its holding pattern code.
 *
 * -- Cort
 */
extern void __secondary_hold(void);
extern unsigned long __secondary_hold_spinloop;
extern unsigned long __secondary_hold_acknowledge;

/*
 * We want to reference the copy of __secondary_hold_* in the
 * 0 - 0x100 address range
 */
#define LOW_ADDR(x)	(((unsigned long) &(x)) & 0xff)

static void __init prom_hold_cpus(void)
{
	unsigned long i;
	unsigned int reg;
	phandle node;
	char type[64];
	int cpuid = 0;
	unsigned int interrupt_server[MAX_CPU_THREADS];
	unsigned int cpu_threads, hw_cpu_num;
	int propsize;
	struct prom_t *_prom = &RELOC(prom);
	unsigned long *spinloop
		= (void *) LOW_ADDR(__secondary_hold_spinloop);
	unsigned long *acknowledge
		= (void *) LOW_ADDR(__secondary_hold_acknowledge);
#ifdef CONFIG_PPC64
	/* __secondary_hold is actually a descriptor, not the text address */
	unsigned long secondary_hold
		= __pa(*PTRRELOC((unsigned long *)__secondary_hold));
#else
	unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
#endif

	prom_debug("prom_hold_cpus: start...\n");
	prom_debug("    1) spinloop       = 0x%x\n", (unsigned long)spinloop);
	prom_debug("    1) *spinloop      = 0x%x\n", *spinloop);
	prom_debug("    1) acknowledge    = 0x%x\n",
		   (unsigned long)acknowledge);
	prom_debug("    1) *acknowledge   = 0x%x\n", *acknowledge);
	prom_debug("    1) secondary_hold = 0x%x\n", secondary_hold);

	/* Set the common spinloop variable, so all of the secondary cpus
	 * will block when they are awakened from their OF spinloop.
	 * This must occur for both SMP and non SMP kernels, since OF will
	 * be trashed when we move the kernel.
	 */
	*spinloop = 0;

#ifdef CONFIG_HMT
	for (i = 0; i < NR_CPUS; i++)
		RELOC(hmt_thread_data)[i].pir = 0xdeadbeef;
#endif
	/* look for cpus */
	for (node = 0; prom_next_node(&node); ) {
		type[0] = 0;
		prom_getprop(node, "device_type", type, sizeof(type));
		if (strcmp(type, RELOC("cpu")) != 0)
			continue;

		/* Skip non-configured cpus. */
		if (prom_getprop(node, "status", type, sizeof(type)) > 0)
			if (strcmp(type, RELOC("okay")) != 0)
				continue;

		reg = -1;
		prom_getprop(node, "reg", &reg, sizeof(reg));

		prom_debug("\ncpuid        = 0x%x\n", cpuid);
		prom_debug("cpu hw idx   = 0x%x\n", reg);

		/* Init the acknowledge var which will be reset by
		 * the secondary cpu when it awakens from its OF
		 * spinloop.
		 */
		*acknowledge = (unsigned long)-1;

		propsize = prom_getprop(node, "ibm,ppc-interrupt-server#s",
					&interrupt_server,
					sizeof(interrupt_server));
		if (propsize < 0) {
			/* no property.  old hardware has no SMT */
			cpu_threads = 1;
			interrupt_server[0] = reg; /* fake it with phys id */
		} else {
			/* We have a threaded processor */
			cpu_threads = propsize / sizeof(u32);
			if (cpu_threads > MAX_CPU_THREADS) {
				prom_printf("SMT: too many threads!\n"
					    "SMT: found %x, max is %x\n",
					    cpu_threads, MAX_CPU_THREADS);
				cpu_threads = 1; /* ToDo: panic? */
			}
		}

		hw_cpu_num = interrupt_server[0];
		if (hw_cpu_num != _prom->cpu) {
			/* Primary Thread of non-boot cpu */
			prom_printf("%x : starting cpu hw idx %x... ", cpuid, reg);
			call_prom("start-cpu", 3, 0, node,
				  secondary_hold, reg);

			for (i = 0; (i < 100000000) && 
			     (*acknowledge == ((unsigned long)-1)); i++ )
				mb();

			if (*acknowledge == reg)
				prom_printf("done\n");
			else
				prom_printf("failed: %x\n", *acknowledge);
		}
#ifdef CONFIG_SMP
		else
			prom_printf("%x : boot cpu     %x\n", cpuid, reg);
#endif /* CONFIG_SMP */

		/* Reserve cpu #s for secondary threads.   They start later. */
		cpuid += cpu_threads;
	}
#ifdef CONFIG_HMT
	/* Only enable HMT on processors that provide support. */
	if (__is_processor(PV_PULSAR) || 
	    __is_processor(PV_ICESTAR) ||
	    __is_processor(PV_SSTAR)) {
		prom_printf("    starting secondary threads\n");

		for (i = 0; i < NR_CPUS; i += 2) {
			if (!cpu_online(i))
				continue;

			if (i == 0) {
				unsigned long pir = mfspr(SPRN_PIR);
				if (__is_processor(PV_PULSAR)) {
					RELOC(hmt_thread_data)[i].pir = 
						pir & 0x1f;
				} else {
					RELOC(hmt_thread_data)[i].pir = 
						pir & 0x3ff;
				}
			}
		}
	} else {
		prom_printf("Processor is not HMT capable\n");
	}
#endif

	if (cpuid > NR_CPUS)
		prom_printf("WARNING: maximum CPUs (" __stringify(NR_CPUS)
			    ") exceeded: ignoring extras\n");

	prom_debug("prom_hold_cpus: end...\n");
}


static void __init prom_init_client_services(unsigned long pp)
{
	struct prom_t *_prom = &RELOC(prom);

	/* Get a handle to the prom entry point before anything else */
	RELOC(prom_entry) = pp;

	/* get a handle for the stdout device */
	_prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
	if (!PHANDLE_VALID(_prom->chosen))
		prom_panic("cannot find chosen"); /* msg won't be printed :( */

	/* get device tree root */
	_prom->root = call_prom("finddevice", 1, 1, ADDR("/"));
	if (!PHANDLE_VALID(_prom->root))
		prom_panic("cannot find device tree root"); /* msg won't be printed :( */

	_prom->mmumap = 0;
}

#ifdef CONFIG_PPC32
/*
 * For really old powermacs, we need to map things we claim.
 * For that, we need the ihandle of the mmu.
 * Also, on the longtrail, we need to work around other bugs.
 */
static void __init prom_find_mmu(void)
{
	struct prom_t *_prom = &RELOC(prom);
	phandle oprom;
	char version[64];

	oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
	if (!PHANDLE_VALID(oprom))
		return;
	if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
		return;
	version[sizeof(version) - 1] = 0;
	/* XXX might need to add other versions here */
	if (strcmp(version, "Open Firmware, 1.0.5") == 0)
		of_workarounds = OF_WA_CLAIM;
	else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
		of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
		call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
	} else
		return;
	_prom->memory = call_prom("open", 1, 1, ADDR("/memory"));
	prom_getprop(_prom->chosen, "mmu", &_prom->mmumap,
		     sizeof(_prom->mmumap));
	if (!IHANDLE_VALID(_prom->memory) || !IHANDLE_VALID(_prom->mmumap))
		of_workarounds &= ~OF_WA_CLAIM;		/* hmmm */
}
#else
#define prom_find_mmu()
#endif

static void __init prom_init_stdout(void)
{
	struct prom_t *_prom = &RELOC(prom);
	char *path = RELOC(of_stdout_device);
	char type[16];
	u32 val;

	if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0)
		prom_panic("cannot find stdout");

	_prom->stdout = val;

	/* Get the full OF pathname of the stdout device */
	memset(path, 0, 256);
	call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255);
	val = call_prom("instance-to-package", 1, 1, _prom->stdout);
	prom_setprop(_prom->chosen, "/chosen", "linux,stdout-package",
		     &val, sizeof(val));
	prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device));
	prom_setprop(_prom->chosen, "/chosen", "linux,stdout-path",
		     path, strlen(path) + 1);

	/* If it's a display, note it */
	memset(type, 0, sizeof(type));
	prom_getprop(val, "device_type", type, sizeof(type));
	if (strcmp(type, RELOC("display")) == 0)
		prom_setprop(val, path, "linux,boot-display", NULL, 0);
}

static void __init prom_close_stdin(void)
{
	struct prom_t *_prom = &RELOC(prom);
	ihandle val;

	if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0)
		call_prom("close", 1, 0, val);
}

static int __init prom_find_machine_type(void)
{
	struct prom_t *_prom = &RELOC(prom);
	char compat[256];
	int len, i = 0;
#ifdef CONFIG_PPC64
	phandle rtas;
#endif
	len = prom_getprop(_prom->root, "compatible",
			   compat, sizeof(compat)-1);
	if (len > 0) {
		compat[len] = 0;
		while (i < len) {
			char *p = &compat[i];
			int sl = strlen(p);
			if (sl == 0)
				break;
			if (strstr(p, RELOC("Power Macintosh")) ||
			    strstr(p, RELOC("MacRISC")))
				return PLATFORM_POWERMAC;
#ifdef CONFIG_PPC64
			if (strstr(p, RELOC("Momentum,Maple")))
				return PLATFORM_MAPLE;
#endif
			i += sl + 1;
		}
	}
#ifdef CONFIG_PPC64
	/* Default to pSeries. We need to know if we are running LPAR */
	rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
	if (PHANDLE_VALID(rtas)) {
		int x = prom_getproplen(rtas, "ibm,hypertas-functions");
		if (x != PROM_ERROR) {
			prom_printf("Hypertas detected, assuming LPAR !\n");
			return PLATFORM_PSERIES_LPAR;
		}
	}
	return PLATFORM_PSERIES;
#else
	return PLATFORM_CHRP;
#endif
}

static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
{
	return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
}

/*
 * If we have a display that we don't know how to drive,
 * we will want to try to execute OF's open method for it
 * later.  However, OF will probably fall over if we do that
 * we've taken over the MMU.
 * So we check whether we will need to open the display,
 * and if so, open it now.
 */
static void __init prom_check_displays(void)
{
	char type[16], *path;
	phandle node;
	ihandle ih;
	int i;

	static unsigned char default_colors[] = {
		0x00, 0x00, 0x00,
		0x00, 0x00, 0xaa,
		0x00, 0xaa, 0x00,
		0x00, 0xaa, 0xaa,
		0xaa, 0x00, 0x00,
		0xaa, 0x00, 0xaa,
		0xaa, 0xaa, 0x00,
		0xaa, 0xaa, 0xaa,
		0x55, 0x55, 0x55,
		0x55, 0x55, 0xff,
		0x55, 0xff, 0x55,
		0x55, 0xff, 0xff,
		0xff, 0x55, 0x55,
		0xff, 0x55, 0xff,
		0xff, 0xff, 0x55,
		0xff, 0xff, 0xff
	};
	const unsigned char *clut;

	prom_printf("Looking for displays\n");
	for (node = 0; prom_next_node(&node); ) {
		memset(type, 0, sizeof(type));
		prom_getprop(node, "device_type", type, sizeof(type));
		if (strcmp(type, RELOC("display")) != 0)
			continue;

		/* It seems OF doesn't null-terminate the path :-( */
		path = RELOC(prom_scratch);
		memset(path, 0, PROM_SCRATCH_SIZE);

		/*
		 * leave some room at the end of the path for appending extra
		 * arguments
		 */
		if (call_prom("package-to-path", 3, 1, node, path,
			      PROM_SCRATCH_SIZE-10) == PROM_ERROR)
			continue;
		prom_printf("found display   : %s, opening ... ", path);
		
		ih = call_prom("open", 1, 1, path);
		if (ih == 0) {
			prom_printf("failed\n");
			continue;
		}

		/* Success */
		prom_printf("done\n");
		prom_setprop(node, path, "linux,opened", NULL, 0);

		/* Setup a usable color table when the appropriate
		 * method is available. Should update this to set-colors */
		clut = RELOC(default_colors);
		for (i = 0; i < 32; i++, clut += 3)
			if (prom_set_color(ih, i, clut[0], clut[1],
					   clut[2]) != 0)
				break;

#ifdef CONFIG_LOGO_LINUX_CLUT224
		clut = PTRRELOC(RELOC(logo_linux_clut224.clut));
		for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3)
			if (prom_set_color(ih, i + 32, clut[0], clut[1],
					   clut[2]) != 0)
				break;
#endif /* CONFIG_LOGO_LINUX_CLUT224 */
	}
}


/* Return (relocated) pointer to this much memory: moves initrd if reqd. */
static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
			      unsigned long needed, unsigned long align)
{
	void *ret;

	*mem_start = _ALIGN(*mem_start, align);
	while ((*mem_start + needed) > *mem_end) {
		unsigned long room, chunk;

		prom_debug("Chunk exhausted, claiming more at %x...\n",
			   RELOC(alloc_bottom));
		room = RELOC(alloc_top) - RELOC(alloc_bottom);
		if (room > DEVTREE_CHUNK_SIZE)
			room = DEVTREE_CHUNK_SIZE;
		if (room < PAGE_SIZE)
			prom_panic("No memory for flatten_device_tree (no room)");
		chunk = alloc_up(room, 0);
		if (chunk == 0)
			prom_panic("No memory for flatten_device_tree (claim failed)");
		*mem_end = RELOC(alloc_top);
	}

	ret = (void *)*mem_start;
	*mem_start += needed;

	return ret;
}

#define dt_push_token(token, mem_start, mem_end) \
	do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)

static unsigned long __init dt_find_string(char *str)
{
	char *s, *os;