}
EXPORT_SYMBOL(efi_enabled);
+ static bool __initdata disable_runtime = false;
static int __init setup_noefi(char *arg)
{
- clear_bit(EFI_BOOT, &x86_efi_facility);
+ disable_runtime = true;
return 0;
}
early_param("noefi", setup_noefi);
int __init efi_memblock_x86_reserve_range(void)
{
+ struct efi_info *e = &boot_params.efi_info;
unsigned long pmap;
#ifdef CONFIG_X86_32
/* Can't handle data above 4GB at this time */
- if (boot_params.efi_info.efi_memmap_hi) {
+ if (e->efi_memmap_hi) {
pr_err("Memory map is above 4GB, disabling EFI.\n");
return -EINVAL;
}
- pmap = boot_params.efi_info.efi_memmap;
+ pmap = e->efi_memmap;
#else
- pmap = (boot_params.efi_info.efi_memmap |
- ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
+ pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32));
#endif
- memmap.phys_map = (void *)pmap;
- memmap.nr_map = boot_params.efi_info.efi_memmap_size /
- boot_params.efi_info.efi_memdesc_size;
- memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
- memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
+ memmap.phys_map = (void *)pmap;
+ memmap.nr_map = e->efi_memmap_size /
+ e->efi_memdesc_size;
+ memmap.desc_size = e->efi_memdesc_size;
+ memmap.desc_version = e->efi_memdesc_version;
+
memblock_reserve(pmap, memmap.nr_map * memmap.desc_size);
return 0;
* - Not within any part of the kernel
* - Not the bios reserved area
*/
- if ((start+size >= virt_to_phys(_text)
- && start <= virt_to_phys(_end)) ||
+ if ((start+size >= __pa_symbol(_text)
+ && start <= __pa_symbol(_end)) ||
!e820_all_mapped(start, start+size, E820_RAM) ||
memblock_is_region_reserved(start, size)) {
/* Could not reserve, skip it */
if (!efi_is_native())
pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
else {
- if (efi_runtime_init())
+ if (disable_runtime || efi_runtime_init())
return;
set_bit(EFI_RUNTIME_SERVICES, &x86_efi_facility);
}
efi_memory_desc_t *md, *prev_md = NULL;
efi_status_t status;
unsigned long size;
- u64 end, systab, end_pfn;
+ u64 end, systab, start_pfn, end_pfn;
void *p, *va, *new_memmap = NULL;
int count = 0;
size = md->num_pages << EFI_PAGE_SHIFT;
end = md->phys_addr + size;
+ start_pfn = PFN_DOWN(md->phys_addr);
end_pfn = PFN_UP(end);
- if (end_pfn <= max_low_pfn_mapped
- || (end_pfn > (1UL << (32 - PAGE_SHIFT))
- && end_pfn <= max_pfn_mapped)) {
+ if (pfn_range_is_mapped(start_pfn, end_pfn)) {
va = __va(md->phys_addr);
if (!(md->attribute & EFI_MEMORY_WB))
--- /dev/null
-static int efivarfs_file_open(struct inode *inode, struct file *file)
-{
- file->private_data = inode->i_private;
- return 0;
-}
-
+ /*
+ * Copyright (C) 2012 Red Hat, Inc.
+ * Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+ #include <linux/efi.h>
+ #include <linux/fs.h>
+
+ #include "internal.h"
+
- .open = efivarfs_file_open,
+ static ssize_t efivarfs_file_write(struct file *file,
+ const char __user *userbuf, size_t count, loff_t *ppos)
+ {
+ struct efivar_entry *var = file->private_data;
+ void *data;
+ u32 attributes;
+ struct inode *inode = file->f_mapping->host;
+ unsigned long datasize = count - sizeof(attributes);
+ ssize_t bytes = 0;
+ bool set = false;
+
+ if (count < sizeof(attributes))
+ return -EINVAL;
+
+ if (copy_from_user(&attributes, userbuf, sizeof(attributes)))
+ return -EFAULT;
+
+ if (attributes & ~(EFI_VARIABLE_MASK))
+ return -EINVAL;
+
+ data = kmalloc(datasize, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) {
+ bytes = -EFAULT;
+ goto out;
+ }
+
+ bytes = efivar_entry_set_get_size(var, attributes, &datasize,
+ data, &set);
+ if (!set && bytes)
+ goto out;
+
+ if (bytes == -ENOENT) {
+ drop_nlink(inode);
+ d_delete(file->f_dentry);
+ dput(file->f_dentry);
+ } else {
+ mutex_lock(&inode->i_mutex);
+ i_size_write(inode, datasize + sizeof(attributes));
+ mutex_unlock(&inode->i_mutex);
+ }
+
+ bytes = count;
+
+ out:
+ kfree(data);
+
+ return bytes;
+ }
+
+ static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf,
+ size_t count, loff_t *ppos)
+ {
+ struct efivar_entry *var = file->private_data;
+ unsigned long datasize = 0;
+ u32 attributes;
+ void *data;
+ ssize_t size = 0;
+ int err;
+
+ err = efivar_entry_size(var, &datasize);
+ if (err)
+ return err;
+
+ data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL);
+
+ if (!data)
+ return -ENOMEM;
+
+ size = efivar_entry_get(var, &attributes, &datasize,
+ data + sizeof(attributes));
+ if (size)
+ goto out_free;
+
+ memcpy(data, &attributes, sizeof(attributes));
+ size = simple_read_from_buffer(userbuf, count, ppos,
+ data, datasize + sizeof(attributes));
+ out_free:
+ kfree(data);
+
+ return size;
+ }
+
+ const struct file_operations efivarfs_file_operations = {
++ .open = simple_open,
+ .read = efivarfs_file_read,
+ .write = efivarfs_file_write,
+ .llseek = no_llseek,
+ };