powerpc: Move remaining .c files from arch/ppc64 to arch/powerpc

This also deletes the now-unused Makefiles under arch/ppc64.

Both of the files moved over could use some merging, but for now I
have moved them as-is and arranged for them to be used only in 64-bit
kernels.  For 32-bit kernels we still use arch/ppc/kernel/idle.c and
drivers/char/generic_nvram.c as before.

Signed-off-by: Paul Mackerras <paulus@samba.org>

3 files changed, 0 insertions, 870 deletions

diff --git a/arch/ppc64/kernel/Makefile b/arch/ppc64/kernel/Makefile
deleted file mode 100644
index 5f0abdb..0000000
--- a/arch/ppc64/kernel/Makefile
+++ /dev/null
@@ -1,7 +0,0 @@
-#
-# Makefile for the linux ppc64 kernel.
-#
-
-obj-y               +=	idle.o
-
-obj-$(CONFIG_PPC_MULTIPLATFORM) += nvram.o
diff --git a/arch/ppc64/kernel/idle.c b/arch/ppc64/kernel/idle.c
deleted file mode 100644
index b879d30..0000000
--- a/arch/ppc64/kernel/idle.c
+++ /dev/null
@@ -1,121 +0,0 @@
-/*
- * Idle daemon for PowerPC.  Idle daemon will handle any action
- * that needs to be taken when the system becomes idle.
- *
- * Originally Written by Cort Dougan (cort@cs.nmt.edu)
- *
- * iSeries supported added by Mike Corrigan <mikejc@us.ibm.com>
- *
- * Additional shared processor, SMT, and firmware support
- *    Copyright (c) 2003 Dave Engebretsen <engebret@us.ibm.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <linux/config.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/smp.h>
-#include <linux/cpu.h>
-#include <linux/sysctl.h>
-
-#include <asm/system.h>
-#include <asm/processor.h>
-#include <asm/cputable.h>
-#include <asm/time.h>
-#include <asm/machdep.h>
-#include <asm/smp.h>
-
-extern void power4_idle(void);
-
-void default_idle(void)
-{
-	unsigned int cpu = smp_processor_id();
-	set_thread_flag(TIF_POLLING_NRFLAG);
-
-	while (1) {
-		if (!need_resched()) {
-			while (!need_resched() && !cpu_is_offline(cpu)) {
-				ppc64_runlatch_off();
-
-				/*
-				 * Go into low thread priority and possibly
-				 * low power mode.
-				 */
-				HMT_low();
-				HMT_very_low();
-			}
-
-			HMT_medium();
-		}
-
-		ppc64_runlatch_on();
-		preempt_enable_no_resched();
-		schedule();
-		preempt_disable();
-		if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
-			cpu_die();
-	}
-}
-
-void native_idle(void)
-{
-	while (1) {
-		ppc64_runlatch_off();
-
-		if (!need_resched())
-			power4_idle();
-
-		if (need_resched()) {
-			ppc64_runlatch_on();
-			preempt_enable_no_resched();
-			schedule();
-			preempt_disable();
-		}
-
-		if (cpu_is_offline(smp_processor_id()) &&
-		    system_state == SYSTEM_RUNNING)
-			cpu_die();
-	}
-}
-
-void cpu_idle(void)
-{
-	BUG_ON(NULL == ppc_md.idle_loop);
-	ppc_md.idle_loop();
-}
-
-int powersave_nap;
-
-#ifdef CONFIG_SYSCTL
-/*
- * Register the sysctl to set/clear powersave_nap.
- */
-static ctl_table powersave_nap_ctl_table[]={
-	{
-		.ctl_name	= KERN_PPC_POWERSAVE_NAP,
-		.procname	= "powersave-nap",
-		.data		= &powersave_nap,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= &proc_dointvec,
-	},
-	{ 0, },
-};
-static ctl_table powersave_nap_sysctl_root[] = {
-	{ 1, "kernel", NULL, 0, 0755, powersave_nap_ctl_table, },
- 	{ 0,},
-};
-
-static int __init
-register_powersave_nap_sysctl(void)
-{
-	register_sysctl_table(powersave_nap_sysctl_root, 0);
-
-	return 0;
-}
-__initcall(register_powersave_nap_sysctl);
-#endif
diff --git a/arch/ppc64/kernel/nvram.c b/arch/ppc64/kernel/nvram.c
deleted file mode 100644
index c0fcd29..0000000
--- a/arch/ppc64/kernel/nvram.c
+++ /dev/null
@@ -1,742 +0,0 @@
-/*
- *  c 2001 PPC 64 Team, IBM Corp
- *
- *      This program is free software; you can redistribute it and/or
- *      modify it under the terms of the GNU General Public License
- *      as published by the Free Software Foundation; either version
- *      2 of the License, or (at your option) any later version.
- *
- * /dev/nvram driver for PPC64
- *
- * This perhaps should live in drivers/char
- *
- * TODO: Split the /dev/nvram part (that one can use
- *       drivers/char/generic_nvram.c) from the arch & partition
- *       parsing code.
- */
-
-#include <linux/module.h>
-
-#include <linux/types.h>
-#include <linux/errno.h>
-#include <linux/fs.h>
-#include <linux/miscdevice.h>
-#include <linux/fcntl.h>
-#include <linux/nvram.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <asm/uaccess.h>
-#include <asm/nvram.h>
-#include <asm/rtas.h>
-#include <asm/prom.h>
-#include <asm/machdep.h>
-
-#undef DEBUG_NVRAM
-
-static int nvram_scan_partitions(void);
-static int nvram_setup_partition(void);
-static int nvram_create_os_partition(void);
-static int nvram_remove_os_partition(void);
-
-static struct nvram_partition * nvram_part;
-static long nvram_error_log_index = -1;
-static long nvram_error_log_size = 0;
-
-int no_logging = 1; 	/* Until we initialize everything,
-			 * make sure we don't try logging
-			 * anything */
-
-extern volatile int error_log_cnt;
-
-struct err_log_info {
-	int error_type;
-	unsigned int seq_num;
-};
-
-static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin)
-{
-	int size;
-
-	if (ppc_md.nvram_size == NULL)
-		return -ENODEV;
-	size = ppc_md.nvram_size();
-
-	switch (origin) {
-	case 1:
-		offset += file->f_pos;
-		break;
-	case 2:
-		offset += size;
-		break;
-	}
-	if (offset < 0)
-		return -EINVAL;
-	file->f_pos = offset;
-	return file->f_pos;
-}
-
-
-static ssize_t dev_nvram_read(struct file *file, char __user *buf,
-			  size_t count, loff_t *ppos)
-{
-	ssize_t len;
-	char *tmp_buffer;
-	int size;
-
-	if (ppc_md.nvram_size == NULL)
-		return -ENODEV;
-	size = ppc_md.nvram_size();
-
-	if (!access_ok(VERIFY_WRITE, buf, count))
-		return -EFAULT;
-	if (*ppos >= size)
-		return 0;
-	if (count > size) 
-		count = size;
-
-	tmp_buffer = (char *) kmalloc(count, GFP_KERNEL);
-	if (!tmp_buffer) {
-		printk(KERN_ERR "dev_read_nvram: kmalloc failed\n");
-		return -ENOMEM;
-	}
-
-	len = ppc_md.nvram_read(tmp_buffer, count, ppos);
-	if ((long)len <= 0) {
-		kfree(tmp_buffer);
-		return len;
-	}
-
-	if (copy_to_user(buf, tmp_buffer, len)) {
-		kfree(tmp_buffer);
-		return -EFAULT;
-	}
-
-	kfree(tmp_buffer);
-	return len;
-
-}
-
-static ssize_t dev_nvram_write(struct file *file, const char __user *buf,
-			   size_t count, loff_t *ppos)
-{
-	ssize_t len;
-	char * tmp_buffer;
-	int size;
-
-	if (ppc_md.nvram_size == NULL)
-		return -ENODEV;
-	size = ppc_md.nvram_size();
-
-	if (!access_ok(VERIFY_READ, buf, count))
-		return -EFAULT;
-	if (*ppos >= size)
-		return 0;
-	if (count > size)
-		count = size;
-
-	tmp_buffer = (char *) kmalloc(count, GFP_KERNEL);
-	if (!tmp_buffer) {
-		printk(KERN_ERR "dev_nvram_write: kmalloc failed\n");
-		return -ENOMEM;
-	}
-	
-	if (copy_from_user(tmp_buffer, buf, count)) {
-		kfree(tmp_buffer);
-		return -EFAULT;
-	}
-
-	len = ppc_md.nvram_write(tmp_buffer, count, ppos);
-	if ((long)len <= 0) {
-		kfree(tmp_buffer);
-		return len;
-	}
-
-	kfree(tmp_buffer);
-	return len;
-}
-
-static int dev_nvram_ioctl(struct inode *inode, struct file *file,
-	unsigned int cmd, unsigned long arg)
-{
-	switch(cmd) {
-#ifdef CONFIG_PPC_PMAC
-	case OBSOLETE_PMAC_NVRAM_GET_OFFSET:
-		printk(KERN_WARNING "nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n");
-	case IOC_NVRAM_GET_OFFSET: {
-		int part, offset;
-
-		if (_machine != PLATFORM_POWERMAC)
-			return -EINVAL;
-		if (copy_from_user(&part, (void __user*)arg, sizeof(part)) != 0)
-			return -EFAULT;
-		if (part < pmac_nvram_OF || part > pmac_nvram_NR)
-			return -EINVAL;
-		offset = pmac_get_partition(part);
-		if (offset < 0)
-			return offset;
-		if (copy_to_user((void __user*)arg, &offset, sizeof(offset)) != 0)
-			return -EFAULT;
-		return 0;
-	}
-#endif /* CONFIG_PPC_PMAC */
-	}
-	return -EINVAL;
-}
-
-struct file_operations nvram_fops = {
-	.owner =	THIS_MODULE,
-	.llseek =	dev_nvram_llseek,
-	.read =		dev_nvram_read,
-	.write =	dev_nvram_write,
-	.ioctl =	dev_nvram_ioctl,
-};
-
-static struct miscdevice nvram_dev = {
-	NVRAM_MINOR,
-	"nvram",
-	&nvram_fops
-};
-
-
-#ifdef DEBUG_NVRAM
-static void nvram_print_partitions(char * label)
-{
-	struct list_head * p;
-	struct nvram_partition * tmp_part;
-	
-	printk(KERN_WARNING "--------%s---------\n", label);
-	printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n");
-	list_for_each(p, &nvram_part->partition) {
-		tmp_part = list_entry(p, struct nvram_partition, partition);
-		printk(KERN_WARNING "%d    \t%02x\t%02x\t%d\t%s\n",
-		       tmp_part->index, tmp_part->header.signature,
-		       tmp_part->header.checksum, tmp_part->header.length,
-		       tmp_part->header.name);
-	}
-}
-#endif
-
-
-static int nvram_write_header(struct nvram_partition * part)
-{
-	loff_t tmp_index;
-	int rc;
-	
-	tmp_index = part->index;
-	rc = ppc_md.nvram_write((char *)&part->header, NVRAM_HEADER_LEN, &tmp_index); 
-
-	return rc;
-}
-
-
-static unsigned char nvram_checksum(struct nvram_header *p)
-{
-	unsigned int c_sum, c_sum2;
-	unsigned short *sp = (unsigned short *)p->name; /* assume 6 shorts */
-	c_sum = p->signature + p->length + sp[0] + sp[1] + sp[2] + sp[3] + sp[4] + sp[5];
-
-	/* The sum may have spilled into the 3rd byte.  Fold it back. */
-	c_sum = ((c_sum & 0xffff) + (c_sum >> 16)) & 0xffff;
-	/* The sum cannot exceed 2 bytes.  Fold it into a checksum */
-	c_sum2 = (c_sum >> 8) + (c_sum << 8);
-	c_sum = ((c_sum + c_sum2) >> 8) & 0xff;
-	return c_sum;
-}
-
-
-/*
- * Find an nvram partition, sig can be 0 for any
- * partition or name can be NULL for any name, else
- * tries to match both
- */
-struct nvram_partition *nvram_find_partition(int sig, const char *name)
-{
-	struct nvram_partition * part;
-	struct list_head * p;
-
-	list_for_each(p, &nvram_part->partition) {
-		part = list_entry(p, struct nvram_partition, partition);
-
-		if (sig && part->header.signature != sig)
-			continue;
-		if (name && 0 != strncmp(name, part->header.name, 12))
-			continue;
-		return part; 
-	}
-	return NULL;
-}
-EXPORT_SYMBOL(nvram_find_partition);
-
-
-static int nvram_remove_os_partition(void)
-{
-	struct list_head *i;
-	struct list_head *j;
-	struct nvram_partition * part;
-	struct nvram_partition * cur_part;
-	int rc;
-
-	list_for_each(i, &nvram_part->partition) {
-		part = list_entry(i, struct nvram_partition, partition);
-		if (part->header.signature != NVRAM_SIG_OS)
-			continue;
-		
-		/* Make os partition a free partition */
-		part->header.signature = NVRAM_SIG_FREE;
-		sprintf(part->header.name, "wwwwwwwwwwww");
-		part->header.checksum = nvram_checksum(&part->header);
-
-		/* Merge contiguous free partitions backwards */
-		list_for_each_prev(j, &part->partition) {
-			cur_part = list_entry(j, struct nvram_partition, partition);
-			if (cur_part == nvram_part || cur_part->header.signature != NVRAM_SIG_FREE) {
-				break;
-			}
-			
-			part->header.length += cur_part->header.length;
-			part->header.checksum = nvram_checksum(&part->header);
-			part->index = cur_part->index;
-
-			list_del(&cur_part->partition);
-			kfree(cur_part);
-			j = &part->partition; /* fixup our loop */
-		}
-		
-		/* Merge contiguous free partitions forwards */
-		list_for_each(j, &part->partition) {
-			cur_part = list_entry(j, struct nvram_partition, partition);
-			if (cur_part == nvram_part || cur_part->header.signature != NVRAM_SIG_FREE) {
-				break;
-			}
-
-			part->header.length += cur_part->header.length;
-			part->header.checksum = nvram_checksum(&part->header);
-
-			list_del(&cur_part->partition);
-			kfree(cur_part);
-			j = &part->partition; /* fixup our loop */
-		}
-		
-		rc = nvram_write_header(part);
-		if (rc <= 0) {
-			printk(KERN_ERR "nvram_remove_os_partition: nvram_write failed (%d)\n", rc);
-			return rc;
-		}
-
-	}
-	
-	return 0;
-}
-
-/* nvram_create_os_partition
- *
- * Create a OS linux partition to buffer error logs.
- * Will create a partition starting at the first free
- * space found if space has enough room.
- */
-static int nvram_create_os_partition(void)
-{
-	struct nvram_partition *part;
-	struct nvram_partition *new_part;
-	struct nvram_partition *free_part = NULL;
-	int seq_init[2] = { 0, 0 };
-	loff_t tmp_index;
-	long size = 0;
-	int rc;
-	
-	/* Find a free partition that will give us the maximum needed size 
-	   If can't find one that will give us the minimum size needed */
-	list_for_each_entry(part, &nvram_part->partition, partition) {
-		if (part->header.signature != NVRAM_SIG_FREE)
-			continue;
-
-		if (part->header.length >= NVRAM_MAX_REQ) {
-			size = NVRAM_MAX_REQ;
-			free_part = part;
-			break;
-		}
-		if (!size && part->header.length >= NVRAM_MIN_REQ) {
-			size = NVRAM_MIN_REQ;
-			free_part = part;
-		}
-	}
-	if (!size)
-		return -ENOSPC;
-	
-	/* Create our OS partition */
-	new_part = kmalloc(sizeof(*new_part), GFP_KERNEL);
-	if (!new_part) {
-		printk(KERN_ERR "nvram_create_os_partition: kmalloc failed\n");
-		return -ENOMEM;
-	}
-
-	new_part->index = free_part->index;
-	new_part->header.signature = NVRAM_SIG_OS;
-	new_part->header.length = size;
-	strcpy(new_part->header.name, "ppc64,linux");
-	new_part->header.checksum = nvram_checksum(&new_part->header);
-
-	rc = nvram_write_header(new_part);
-	if (rc <= 0) {
-		printk(KERN_ERR "nvram_create_os_partition: nvram_write_header \
-				failed (%d)\n", rc);
-		return rc;
-	}
-
-	/* make sure and initialize to zero the sequence number and the error
-	   type logged */
-	tmp_index = new_part->index + NVRAM_HEADER_LEN;
-	rc = ppc_md.nvram_write((char *)&seq_init, sizeof(seq_init), &tmp_index);
-	if (rc <= 0) {
-		printk(KERN_ERR "nvram_create_os_partition: nvram_write "
-				"failed (%d)\n", rc);
-		return rc;
-	}
-	
-	nvram_error_log_index = new_part->index + NVRAM_HEADER_LEN;
-	nvram_error_log_size = ((part->header.length - 1) *
-				NVRAM_BLOCK_LEN) - sizeof(struct err_log_info);
-	
-	list_add_tail(&new_part->partition, &free_part->partition);
-
-	if (free_part->header.length <= size) {
-		list_del(&free_part->partition);
-		kfree(free_part);
-		return 0;
-	} 
-
-	/* Adjust the partition we stole the space from */
-	free_part->index += size * NVRAM_BLOCK_LEN;
-	free_part->header.length -= size;
-	free_part->header.checksum = nvram_checksum(&free_part->header);
-	
-	rc = nvram_write_header(free_part);
-	if (rc <= 0) {
-		printk(KERN_ERR "nvram_create_os_partition: nvram_write_header "
-		       "failed (%d)\n", rc);
-		return rc;
-	}
-
-	return 0;
-}
-
-
-/* nvram_setup_partition
- *
- * This will setup the partition we need for buffering the
- * error logs and cleanup partitions if needed.
- *
- * The general strategy is the following:
- * 1.) If there is ppc64,linux partition large enough then use it.
- * 2.) If there is not a ppc64,linux partition large enough, search
- * for a free partition that is large enough.
- * 3.) If there is not a free partition large enough remove 
- * _all_ OS partitions and consolidate the space.
- * 4.) Will first try getting a chunk that will satisfy the maximum
- * error log size (NVRAM_MAX_REQ).
- * 5.) If the max chunk cannot be allocated then try finding a chunk
- * that will satisfy the minum needed (NVRAM_MIN_REQ).
- */
-static int nvram_setup_partition(void)
-{
-	struct list_head * p;
-	struct nvram_partition * part;
-	int rc;
-
-	/* For now, we don't do any of this on pmac, until I
-	 * have figured out if it's worth killing some unused stuffs
-	 * in our nvram, as Apple defined partitions use pretty much
-	 * all of the space
-	 */
-	if (_machine == PLATFORM_POWERMAC)
-		return -ENOSPC;
-
-	/* see if we have an OS partition that meets our needs.
-	   will try getting the max we need.  If not we'll delete
-	   partitions and try again. */
-	list_for_each(p, &nvram_part->partition) {
-		part = list_entry(p, struct nvram_partition, partition);
-		if (part->header.signature != NVRAM_SIG_OS)
-			continue;
-
-		if (strcmp(part->header.name, "ppc64,linux"))
-			continue;
-
-		if (part->header.length >= NVRAM_MIN_REQ) {
-			/* found our partition */
-			nvram_error_log_index = part->index + NVRAM_HEADER_LEN;
-			nvram_error_log_size = ((part->header.length - 1) *
-						NVRAM_BLOCK_LEN) - sizeof(struct err_log_info);
-			return 0;
-		}
-	}
-	
-	/* try creating a partition with the free space we have */
-	rc = nvram_create_os_partition();
-	if (!rc) {
-		return 0;
-	}
-		
-	/* need to free up some space */
-	rc = nvram_remove_os_partition();
-	if (rc) {
-		return rc;
-	}
-	
-	/* create a partition in this new space */
-	rc = nvram_create_os_partition();
-	if (rc) {
-		printk(KERN_ERR "nvram_create_os_partition: Could not find a "
-		       "NVRAM partition large enough\n");
-		return rc;
-	}
-	
-	return 0;
-}
-
-
-static int nvram_scan_partitions(void)
-{
-	loff_t cur_index = 0;
-	struct nvram_header phead;
-	struct nvram_partition * tmp_part;
-	unsigned char c_sum;
-	char * header;
-	int total_size;
-	int err;
-
-	if (ppc_md.nvram_size == NULL)
-		return -ENODEV;
-	total_size = ppc_md.nvram_size();
-	
-	header = (char *) kmalloc(NVRAM_HEADER_LEN, GFP_KERNEL);
-	if (!header) {
-		printk(KERN_ERR "nvram_scan_partitions: Failed kmalloc\n");
-		return -ENOMEM;
-	}
-
-	while (cur_index < total_size) {
-
-		err = ppc_md.nvram_read(header, NVRAM_HEADER_LEN, &cur_index);
-		if (err != NVRAM_HEADER_LEN) {
-			printk(KERN_ERR "nvram_scan_partitions: Error parsing "
-			       "nvram partitions\n");
-			goto out;
-		}
-
-		cur_index -= NVRAM_HEADER_LEN; /* nvram_read will advance us */
-
-		memcpy(&phead, header, NVRAM_HEADER_LEN);
-
-		err = 0;
-		c_sum = nvram_checksum(&phead);
-		if (c_sum != phead.checksum) {
-			printk(KERN_WARNING "WARNING: nvram partition checksum"
-			       " was %02x, should be %02x!\n",
-			       phead.checksum, c_sum);
-			printk(KERN_WARNING "Terminating nvram partition scan\n");
-			goto out;
-		}
-		if (!phead.length) {
-			printk(KERN_WARNING "WARNING: nvram corruption "
-			       "detected: 0-length partition\n");
-			goto out;
-		}
-		tmp_part = (struct nvram_partition *)
-			kmalloc(sizeof(struct nvram_partition), GFP_KERNEL);
-		err = -ENOMEM;
-		if (!tmp_part) {
-			printk(KERN_ERR "nvram_scan_partitions: kmalloc failed\n");
-			goto out;
-		}
-		
-		memcpy(&tmp_part->header, &phead, NVRAM_HEADER_LEN);
-		tmp_part->index = cur_index;
-		list_add_tail(&tmp_part->partition, &nvram_part->partition);
-		
-		cur_index += phead.length * NVRAM_BLOCK_LEN;
-	}
-	err = 0;
-
- out:
-	kfree(header);
-	return err;
-}
-
-static int __init nvram_init(void)
-{
-	int error;
-	int rc;
-	
-	if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0)
-		return  -ENODEV;
-
-  	rc = misc_register(&nvram_dev);
-	if (rc != 0) {
-		printk(KERN_ERR "nvram_init: failed to register device\n");
-		return rc;
-	}
-  	
-  	/* initialize our anchor for the nvram partition list */
-  	nvram_part = (struct nvram_partition *) kmalloc(sizeof(struct nvram_partition), GFP_KERNEL);
-  	if (!nvram_part) {
-  		printk(KERN_ERR "nvram_init: Failed kmalloc\n");
-  		return -ENOMEM;
-  	}
-  	INIT_LIST_HEAD(&nvram_part->partition);
-  
-  	/* Get all the NVRAM partitions */
-  	error = nvram_scan_partitions();
-  	if (error) {
-  		printk(KERN_ERR "nvram_init: Failed nvram_scan_partitions\n");
-  		return error;
-  	}
-  		
-  	if(nvram_setup_partition()) 
-  		printk(KERN_WARNING "nvram_init: Could not find nvram partition"
-  		       " for nvram buffered error logging.\n");
-  
-#ifdef DEBUG_NVRAM
-	nvram_print_partitions("NVRAM Partitions");
-#endif
-
-  	return rc;
-}
-
-void __exit nvram_cleanup(void)
-{
-        misc_deregister( &nvram_dev );
-}
-
-
-#ifdef CONFIG_PPC_PSERIES
-
-/* nvram_write_error_log
- *
- * We need to buffer the error logs into nvram to ensure that we have
- * the failure information to decode.  If we have a severe error there
- * is no way to guarantee that the OS or the machine is in a state to
- * get back to user land and write the error to disk.  For example if
- * the SCSI device driver causes a Machine Check by writing to a bad
- * IO address, there is no way of guaranteeing that the device driver
- * is in any state that is would also be able to write the error data
- * captured to disk, thus we buffer it in NVRAM for analysis on the
- * next boot.
- *
- * In NVRAM the partition containing the error log buffer will looks like:
- * Header (in bytes):
- * +-----------+----------+--------+------------+------------------+
- * | signature | checksum | length | name       | data             |
- * |0          |1         |2      3|4         15|16        length-1|
- * +-----------+----------+--------+------------+------------------+
- *
- * The 'data' section would look like (in bytes):
- * +--------------+------------+-----------------------------------+
- * | event_logged | sequence # | error log                         |
- * |0            3|4          7|8            nvram_error_log_size-1|
- * +--------------+------------+-----------------------------------+
- *
- * event_logged: 0 if event has not been logged to syslog, 1 if it has
- * sequence #: The unique sequence # for each event. (until it wraps)
- * error log: The error log from event_scan
- */
-int nvram_write_error_log(char * buff, int length, unsigned int err_type)
-{
-	int rc;
-	loff_t tmp_index;
-	struct err_log_info info;
-	
-	if (no_logging) {
-		return -EPERM;
-	}
-
-	if (nvram_error_log_index == -1) {
-		return -ESPIPE;
-	}
-
-	if (length > nvram_error_log_size) {
-		length = nvram_error_log_size;
-	}
-
-	info.error_type = err_type;
-	info.seq_num = error_log_cnt;
-
-	tmp_index = nvram_error_log_index;
-
-	rc = ppc_md.nvram_write((char *)&info, sizeof(struct err_log_info), &tmp_index);
-	if (rc <= 0) {
-		printk(KERN_ERR "nvram_write_error_log: Failed nvram_write (%d)\n", rc);
-		return rc;
-	}
-
-	rc = ppc_md.nvram_write(buff, length, &tmp_index);
-	if (rc <= 0) {
-		printk(KERN_ERR "nvram_write_error_log: Failed nvram_write (%d)\n", rc);
-		return rc;
-	}
-	
-	return 0;
-}
-
-/* nvram_read_error_log
- *
- * Reads nvram for error log for at most 'length'
- */
-int nvram_read_error_log(char * buff, int length, unsigned int * err_type)
-{
-	int rc;
-	loff_t tmp_index;
-	struct err_log_info info;
-	
-	if (nvram_error_log_index == -1)
-		return -1;
-
-	if (length > nvram_error_log_size)
-		length = nvram_error_log_size;
-
-	tmp_index = nvram_error_log_index;
-
-	rc = ppc_md.nvram_read((char *)&info, sizeof(struct err_log_info), &tmp_index);
-	if (rc <= 0) {
-		printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc);
-		return rc;
-	}
-
-	rc = ppc_md.nvram_read(buff, length, &tmp_index);
-	if (rc <= 0) {
-		printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc);
-		return rc;
-	}
-
-	error_log_cnt = info.seq_num;
-	*err_type = info.error_type;
-
-	return 0;
-}
-
-/* This doesn't actually zero anything, but it sets the event_logged
- * word to tell that this event is safely in syslog.
- */
-int nvram_clear_error_log(void)
-{
-	loff_t tmp_index;
-	int clear_word = ERR_FLAG_ALREADY_LOGGED;
-	int rc;
-
-	tmp_index = nvram_error_log_index;
-	
-	rc = ppc_md.nvram_write((char *)&clear_word, sizeof(int), &tmp_index);
-	if (rc <= 0) {
-		printk(KERN_ERR "nvram_clear_error_log: Failed nvram_write (%d)\n", rc);
-		return rc;
-	}
-
-	return 0;
-}
-
-#endif /* CONFIG_PPC_PSERIES */
-
-module_init(nvram_init);
-module_exit(nvram_cleanup);
-MODULE_LICENSE("GPL");