* 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>
static kern_memdesc_t *kern_memmap;
+#define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
+
+static inline u64
+kmd_end(kern_memdesc_t *kmd)
+{
+ return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
+}
+
+static inline u64
+efi_md_end(efi_memory_desc_t *md)
+{
+ return (md->phys_addr + efi_md_size(md));
+}
+
+static inline int
+efi_wb(efi_memory_desc_t *md)
+{
+ return (md->attribute & EFI_MEMORY_WB);
+}
+
+static inline int
+efi_uc(efi_memory_desc_t *md)
+{
+ return (md->attribute & EFI_MEMORY_UC);
+}
+
static void
walk (efi_freemem_callback_t callback, void *arg, u64 attr)
{
efi_config_table_t *config_tables;
efi_char16_t *c16;
u64 efi_desc_size;
- char *cp, *end, vendor[100] = "unknown";
+ char *cp, vendor[100] = "unknown";
extern char saved_command_line[];
int i;
/* it's too early to be able to use the standard kernel command line support... */
for (cp = saved_command_line; *cp; ) {
if (memcmp(cp, "mem=", 4) == 0) {
- cp += 4;
- mem_limit = memparse(cp, &end);
- if (end != cp)
- break;
- cp = end;
+ mem_limit = memparse(cp + 4, &cp);
} else if (memcmp(cp, "max_addr=", 9) == 0) {
- cp += 9;
- max_addr = GRANULEROUNDDOWN(memparse(cp, &end));
- if (end != cp)
- break;
- cp = end;
+ max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
} else {
while (*cp != ' ' && *cp)
++cp;
/* Show what we know for posterity */
c16 = __va(efi.systab->fw_vendor);
if (c16) {
- for (i = 0;i < (int) sizeof(vendor) && *c16; ++i)
+ for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i)
vendor[i] = *c16++;
vendor[i] = '\0';
}
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;
}
-u32
-efi_mem_type (unsigned long phys_addr)
+static struct kern_memdesc *
+kern_memory_descriptor (unsigned long phys_addr)
+{
+ struct kern_memdesc *md;
+
+ for (md = kern_memmap; md->start != ~0UL; md++) {
+ if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
+ return md;
+ }
+ return 0;
+}
+
+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;
md = p;
if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
- return md->type;
+ return md;
}
return 0;
}
+u32
+efi_mem_type (unsigned long phys_addr)
+{
+ efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
+
+ if (md)
+ return md->type;
+ return 0;
+}
+
u64
efi_mem_attributes (unsigned long phys_addr)
{
- void *efi_map_start, *efi_map_end, *p;
- efi_memory_desc_t *md;
- u64 efi_desc_size;
+ efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
- 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;
+ if (md)
+ return md->attribute;
+ return 0;
+}
+EXPORT_SYMBOL(efi_mem_attributes);
- for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
- md = p;
+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);
+ u64 attr;
- if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
- return md->attribute;
+ 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 {
+ unsigned long md_end = efi_md_end(md);
+
+ if (end <= md_end)
+ return attr;
+
+ md = efi_memory_descriptor(md_end);
+ if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
+ return 0;
+ } while (md);
+ return 0;
+}
+
+u64
+kern_mem_attribute (unsigned long phys_addr, unsigned long size)
+{
+ 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(efi_mem_attributes);
+EXPORT_SYMBOL(kern_mem_attribute);
int
-valid_phys_addr_range (unsigned long phys_addr, unsigned long *size)
+valid_phys_addr_range (unsigned long phys_addr, unsigned long size)
{
- void *efi_map_start, *efi_map_end, *p;
- efi_memory_desc_t *md;
- u64 efi_desc_size;
+ u64 attr;
- 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;
+ /*
+ * /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;
+}
- for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
- md = p;
+int
+valid_mmap_phys_addr_range (unsigned long phys_addr, unsigned long size)
+{
+ /*
+ * 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.
+ */
+ return 1;
+}
- if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT)) {
- if (!(md->attribute & EFI_MEMORY_WB))
- 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;
- if (*size > md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - phys_addr)
- *size = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - phys_addr;
- return 1;
- }
- }
- return 0;
+ /*
+ * 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
return 0;
}
-#define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
-
-static inline u64
-kmd_end(kern_memdesc_t *kmd)
-{
- return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
-}
-
-static inline u64
-efi_md_end(efi_memory_desc_t *md)
-{
- return (md->phys_addr + efi_md_size(md));
-}
-
-static inline int
-efi_wb(efi_memory_desc_t *md)
-{
- return (md->attribute & EFI_MEMORY_WB);
-}
-
-static inline int
-efi_uc(efi_memory_desc_t *md)
-{
- return (md->attribute & EFI_MEMORY_UC);
-}
-
/*
* Look for the first granule aligned memory descriptor memory
* that is big enough to hold EFI memory map. Make sure this
git.openpandora.org / pandora-kernel.git / blobdiff