* Copyright (C) 1999-2003 Hewlett-Packard Co.
* David Mosberger-Tang <davidm@hpl.hp.com>
* Stephane Eranian <eranian@hpl.hp.com>
+ * (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
+ * Bjorn Helgaas <bjorn.helgaas@hp.com>
*
* All EFI Runtime Services are not implemented yet as EFI only
* supports physical mode addressing on SoftSDV. This is to be fixed
* Goutham Rao: <goutham.rao@intel.com>
* Skip non-WB memory and ignore empty memory ranges.
*/
-#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/time.h>
#include <linux/efi.h>
+#include <linux/kexec.h>
#include <asm/io.h>
#include <asm/kregs.h>
struct efi efi;
EXPORT_SYMBOL(efi);
static efi_runtime_services_t *runtime;
-static unsigned long mem_limit = ~0UL, max_addr = ~0UL;
+static unsigned long mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
#define efi_call_virt(f, args...) (*(f))(args)
}
static int
-is_available_memory (efi_memory_desc_t *md)
+is_memory_available (efi_memory_desc_t *md)
{
if (!(md->attribute & EFI_MEMORY_WB))
return 0;
mem_limit = memparse(cp + 4, &cp);
} else if (memcmp(cp, "max_addr=", 9) == 0) {
max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
+ } else if (memcmp(cp, "min_addr=", 9) == 0) {
+ min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
} else {
while (*cp != ' ' && *cp)
++cp;
++cp;
}
}
+ if (min_addr != 0UL)
+ printk(KERN_INFO "Ignoring memory below %luMB\n", min_addr >> 20);
if (max_addr != ~0UL)
printk(KERN_INFO "Ignoring memory above %luMB\n", max_addr >> 20);
printk(KERN_INFO "EFI v%u.%.02u by %s:",
efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor);
+ efi.mps = EFI_INVALID_TABLE_ADDR;
+ efi.acpi = EFI_INVALID_TABLE_ADDR;
+ efi.acpi20 = EFI_INVALID_TABLE_ADDR;
+ efi.smbios = EFI_INVALID_TABLE_ADDR;
+ efi.sal_systab = EFI_INVALID_TABLE_ADDR;
+ efi.boot_info = EFI_INVALID_TABLE_ADDR;
+ efi.hcdp = EFI_INVALID_TABLE_ADDR;
+ efi.uga = EFI_INVALID_TABLE_ADDR;
+
for (i = 0; i < (int) efi.systab->nr_tables; i++) {
if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
- efi.mps = __va(config_tables[i].table);
+ efi.mps = config_tables[i].table;
printk(" MPS=0x%lx", config_tables[i].table);
} else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
- efi.acpi20 = __va(config_tables[i].table);
+ efi.acpi20 = config_tables[i].table;
printk(" ACPI 2.0=0x%lx", config_tables[i].table);
} else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
- efi.acpi = __va(config_tables[i].table);
+ efi.acpi = config_tables[i].table;
printk(" ACPI=0x%lx", config_tables[i].table);
} else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
- efi.smbios = __va(config_tables[i].table);
+ efi.smbios = config_tables[i].table;
printk(" SMBIOS=0x%lx", config_tables[i].table);
} else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
- efi.sal_systab = __va(config_tables[i].table);
+ efi.sal_systab = config_tables[i].table;
printk(" SALsystab=0x%lx", config_tables[i].table);
} else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
- efi.hcdp = __va(config_tables[i].table);
+ efi.hcdp = config_tables[i].table;
printk(" HCDP=0x%lx", config_tables[i].table);
}
}
return 0;
}
-static efi_memory_desc_t *
-efi_memory_descriptor (unsigned long phys_addr)
+static struct kern_memdesc *
+kern_memory_descriptor (unsigned long phys_addr)
{
- void *efi_map_start, *efi_map_end, *p;
- efi_memory_desc_t *md;
- u64 efi_desc_size;
-
- efi_map_start = __va(ia64_boot_param->efi_memmap);
- efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
- efi_desc_size = ia64_boot_param->efi_memdesc_size;
+ struct kern_memdesc *md;
- for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
- md = p;
-
- if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
+ for (md = kern_memmap; md->start != ~0UL; md++) {
+ if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
return md;
}
- return 0;
+ return NULL;
}
-static int
-efi_memmap_has_mmio (void)
+static efi_memory_desc_t *
+efi_memory_descriptor (unsigned long phys_addr)
{
void *efi_map_start, *efi_map_end, *p;
efi_memory_desc_t *md;
for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
md = p;
- if (md->type == EFI_MEMORY_MAPPED_IO)
- return 1;
+ if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
+ return md;
}
- return 0;
+ return NULL;
}
u32
}
EXPORT_SYMBOL(efi_mem_attributes);
-/*
- * Determines whether the memory at phys_addr supports the desired
- * attribute (WB, UC, etc). If this returns 1, the caller can safely
- * access *size bytes at phys_addr with the specified attribute.
- */
-static int
-efi_mem_attribute_range (unsigned long phys_addr, unsigned long *size, u64 attr)
+u64
+efi_mem_attribute (unsigned long phys_addr, unsigned long size)
{
+ unsigned long end = phys_addr + size;
efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
- unsigned long md_end;
+ u64 attr;
- if (!md || (md->attribute & attr) != attr)
+ if (!md)
return 0;
+ /*
+ * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
+ * the kernel that firmware needs this region mapped.
+ */
+ attr = md->attribute & ~EFI_MEMORY_RUNTIME;
do {
- md_end = efi_md_end(md);
- if (phys_addr + *size <= md_end)
- return 1;
+ unsigned long md_end = efi_md_end(md);
+
+ if (end <= md_end)
+ return attr;
md = efi_memory_descriptor(md_end);
- if (!md || (md->attribute & attr) != attr) {
- *size = md_end - phys_addr;
- return 1;
- }
+ if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
+ return 0;
} while (md);
return 0;
}
-/*
- * For /dev/mem, we only allow read & write system calls to access
- * write-back memory, because read & write don't allow the user to
- * control access size.
- */
-int
-valid_phys_addr_range (unsigned long phys_addr, unsigned long *size)
+u64
+kern_mem_attribute (unsigned long phys_addr, unsigned long size)
{
- return efi_mem_attribute_range(phys_addr, size, EFI_MEMORY_WB);
+ unsigned long end = phys_addr + size;
+ struct kern_memdesc *md;
+ u64 attr;
+
+ /*
+ * This is a hack for ioremap calls before we set up kern_memmap.
+ * Maybe we should do efi_memmap_init() earlier instead.
+ */
+ if (!kern_memmap) {
+ attr = efi_mem_attribute(phys_addr, size);
+ if (attr & EFI_MEMORY_WB)
+ return EFI_MEMORY_WB;
+ return 0;
+ }
+
+ md = kern_memory_descriptor(phys_addr);
+ if (!md)
+ return 0;
+
+ attr = md->attribute;
+ do {
+ unsigned long md_end = kmd_end(md);
+
+ if (end <= md_end)
+ return attr;
+
+ md = kern_memory_descriptor(md_end);
+ if (!md || md->attribute != attr)
+ return 0;
+ } while (md);
+ return 0;
}
+EXPORT_SYMBOL(kern_mem_attribute);
-/*
- * We allow mmap of anything in the EFI memory map that supports
- * either write-back or uncacheable access. For uncacheable regions,
- * the supported access sizes are system-dependent, and the user is
- * responsible for using the correct size.
- *
- * Note that this doesn't currently allow access to hot-added memory,
- * because that doesn't appear in the boot-time EFI memory map.
- */
int
-valid_mmap_phys_addr_range (unsigned long phys_addr, unsigned long *size)
+valid_phys_addr_range (unsigned long phys_addr, unsigned long size)
{
- if (efi_mem_attribute_range(phys_addr, size, EFI_MEMORY_WB))
- return 1;
+ u64 attr;
- if (efi_mem_attribute_range(phys_addr, size, EFI_MEMORY_UC))
+ /*
+ * /dev/mem reads and writes use copy_to_user(), which implicitly
+ * uses a granule-sized kernel identity mapping. It's really
+ * only safe to do this for regions in kern_memmap. For more
+ * details, see Documentation/ia64/aliasing.txt.
+ */
+ attr = kern_mem_attribute(phys_addr, size);
+ if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
return 1;
+ return 0;
+}
+int
+valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
+{
/*
- * Some firmware doesn't report MMIO regions in the EFI memory map.
- * The Intel BigSur (a.k.a. HP i2000) has this problem. In this
- * case, we can't use the EFI memory map to validate mmap requests.
+ * MMIO regions are often missing from the EFI memory map.
+ * We must allow mmap of them for programs like X, so we
+ * currently can't do any useful validation.
*/
- if (!efi_memmap_has_mmio())
- return 1;
+ return 1;
+}
- return 0;
+pgprot_t
+phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
+ pgprot_t vma_prot)
+{
+ unsigned long phys_addr = pfn << PAGE_SHIFT;
+ u64 attr;
+
+ /*
+ * For /dev/mem mmap, we use user mappings, but if the region is
+ * in kern_memmap (and hence may be covered by a kernel mapping),
+ * we must use the same attribute as the kernel mapping.
+ */
+ attr = kern_mem_attribute(phys_addr, size);
+ if (attr & EFI_MEMORY_WB)
+ return pgprot_cacheable(vma_prot);
+ else if (attr & EFI_MEMORY_UC)
+ return pgprot_noncached(vma_prot);
+
+ /*
+ * Some chipsets don't support UC access to memory. If
+ * WB is supported, we prefer that.
+ */
+ if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
+ return pgprot_cacheable(vma_prot);
+
+ return pgprot_noncached(vma_prot);
}
int __init
}
contig_high = GRANULEROUNDDOWN(contig_high);
}
- if (!is_available_memory(md) || md->type == EFI_LOADER_DATA)
+ if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
continue;
/* Round ends inward to granule boundaries */
as = max(contig_low, md->phys_addr);
ae = min(contig_high, efi_md_end(md));
- /* keep within max_addr= command line arg */
+ /* keep within max_addr= and min_addr= command line arg */
+ as = max(as, min_addr);
ae = min(ae, max_addr);
if (ae <= as)
continue;
void
efi_memmap_init(unsigned long *s, unsigned long *e)
{
- struct kern_memdesc *k, *prev = 0;
+ struct kern_memdesc *k, *prev = NULL;
u64 contig_low=0, contig_high=0;
u64 as, ae, lim;
void *efi_map_start, *efi_map_end, *p, *q;
}
contig_high = GRANULEROUNDDOWN(contig_high);
}
- if (!is_available_memory(md))
+ if (!is_memory_available(md))
continue;
/*
} else
ae = efi_md_end(md);
- /* keep within max_addr= command line arg */
+ /* keep within max_addr= and min_addr= command line arg */
+ as = max(as, min_addr);
ae = min(ae, max_addr);
if (ae <= as)
continue;
*/
insert_resource(res, code_resource);
insert_resource(res, data_resource);
+#ifdef CONFIG_KEXEC
+ insert_resource(res, &efi_memmap_res);
+ insert_resource(res, &boot_param_res);
+ if (crashk_res.end > crashk_res.start)
+ insert_resource(res, &crashk_res);
+#endif
}
}
}
+
+#ifdef CONFIG_KEXEC
+/* find a block of memory aligned to 64M exclude reserved regions
+ rsvd_regions are sorted
+ */
+unsigned long
+kdump_find_rsvd_region (unsigned long size,
+ struct rsvd_region *r, int n)
+{
+ int i;
+ u64 start, end;
+ u64 alignment = 1UL << _PAGE_SIZE_64M;
+ void *efi_map_start, *efi_map_end, *p;
+ efi_memory_desc_t *md;
+ u64 efi_desc_size;
+
+ efi_map_start = __va(ia64_boot_param->efi_memmap);
+ efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
+ efi_desc_size = ia64_boot_param->efi_memdesc_size;
+
+ for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
+ md = p;
+ if (!efi_wb(md))
+ continue;
+ start = ALIGN(md->phys_addr, alignment);
+ end = efi_md_end(md);
+ for (i = 0; i < n; i++) {
+ if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
+ if (__pa(r[i].start) > start + size)
+ return start;
+ start = ALIGN(__pa(r[i].end), alignment);
+ if (i < n-1 && __pa(r[i+1].start) < start + size)
+ continue;
+ else
+ break;
+ }
+ }
+ if (end > start + size)
+ return start;
+ }
+
+ printk(KERN_WARNING "Cannot reserve 0x%lx byte of memory for crashdump\n",
+ size);
+ return ~0UL;
+}
+#endif
git://git.onelab.eu / linux-2.6.git / blobdiff