linux/arch/x86/kernel/efi.c
Paul Jackson 200001eb14 x86 boot: only pick up additional EFI memmap if add_efi_memmap flag
Applies on top of the previous patch:
  x86 boot: add code to add BIOS provided EFI memory entries to kernel

Instead of always adding EFI memory map entries (if present) to the
memory map after initially finding either E820 BIOS memory map entries
and/or kernel command line memmap entries, -instead- only add such
additional EFI memory map entries if the kernel boot option:

    add_efi_memmap

is specified.

Requiring this 'add_efi_memmap' option is backward compatible with
kernels that didn't load such additional EFI memory map entries in
the first place, and it doesn't override a configuration that tries
to replace all E820 or EFI BIOS memory map entries with ones given
entirely on the kernel command line.

Signed-off-by: Paul Jackson <pj@sgi.com>
Cc: "Yinghai Lu" <yhlu.kernel@gmail.com>
Cc: "Jack Steiner" <steiner@sgi.com>
Cc: "Mike Travis" <travis@sgi.com>
Cc: "Huang
Cc: Ying" <ying.huang@intel.com>
Cc: "Andi Kleen" <andi@firstfloor.org>
Cc: "Andrew Morton" <akpm@linux-foundation.org>
Cc: Paul Jackson <pj@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-08 13:10:41 +02:00

571 lines
15 KiB
C

/*
* Common EFI (Extensible Firmware Interface) support functions
* Based on Extensible Firmware Interface Specification version 1.0
*
* Copyright (C) 1999 VA Linux Systems
* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
* Copyright (C) 1999-2002 Hewlett-Packard Co.
* David Mosberger-Tang <davidm@hpl.hp.com>
* Stephane Eranian <eranian@hpl.hp.com>
* Copyright (C) 2005-2008 Intel Co.
* Fenghua Yu <fenghua.yu@intel.com>
* Bibo Mao <bibo.mao@intel.com>
* Chandramouli Narayanan <mouli@linux.intel.com>
* Huang Ying <ying.huang@intel.com>
*
* Copied from efi_32.c to eliminate the duplicated code between EFI
* 32/64 support code. --ying 2007-10-26
*
* All EFI Runtime Services are not implemented yet as EFI only
* supports physical mode addressing on SoftSDV. This is to be fixed
* in a future version. --drummond 1999-07-20
*
* Implemented EFI runtime services and virtual mode calls. --davidm
*
* Goutham Rao: <goutham.rao@intel.com>
* Skip non-WB memory and ignore empty memory ranges.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/efi.h>
#include <linux/bootmem.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/time.h>
#include <linux/io.h>
#include <linux/reboot.h>
#include <linux/bcd.h>
#include <asm/setup.h>
#include <asm/efi.h>
#include <asm/time.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#define EFI_DEBUG 1
#define PFX "EFI: "
int efi_enabled;
EXPORT_SYMBOL(efi_enabled);
struct efi efi;
EXPORT_SYMBOL(efi);
struct efi_memory_map memmap;
static struct efi efi_phys __initdata;
static efi_system_table_t efi_systab __initdata;
static int __init setup_noefi(char *arg)
{
efi_enabled = 0;
return 0;
}
early_param("noefi", setup_noefi);
int add_efi_memmap;
EXPORT_SYMBOL(add_efi_memmap);
static int __init setup_add_efi_memmap(char *arg)
{
add_efi_memmap = 1;
return 0;
}
early_param("add_efi_memmap", setup_add_efi_memmap);
static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
{
return efi_call_virt2(get_time, tm, tc);
}
static efi_status_t virt_efi_set_time(efi_time_t *tm)
{
return efi_call_virt1(set_time, tm);
}
static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
efi_bool_t *pending,
efi_time_t *tm)
{
return efi_call_virt3(get_wakeup_time,
enabled, pending, tm);
}
static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
{
return efi_call_virt2(set_wakeup_time,
enabled, tm);
}
static efi_status_t virt_efi_get_variable(efi_char16_t *name,
efi_guid_t *vendor,
u32 *attr,
unsigned long *data_size,
void *data)
{
return efi_call_virt5(get_variable,
name, vendor, attr,
data_size, data);
}
static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
efi_char16_t *name,
efi_guid_t *vendor)
{
return efi_call_virt3(get_next_variable,
name_size, name, vendor);
}
static efi_status_t virt_efi_set_variable(efi_char16_t *name,
efi_guid_t *vendor,
unsigned long attr,
unsigned long data_size,
void *data)
{
return efi_call_virt5(set_variable,
name, vendor, attr,
data_size, data);
}
static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
{
return efi_call_virt1(get_next_high_mono_count, count);
}
static void virt_efi_reset_system(int reset_type,
efi_status_t status,
unsigned long data_size,
efi_char16_t *data)
{
efi_call_virt4(reset_system, reset_type, status,
data_size, data);
}
static efi_status_t virt_efi_set_virtual_address_map(
unsigned long memory_map_size,
unsigned long descriptor_size,
u32 descriptor_version,
efi_memory_desc_t *virtual_map)
{
return efi_call_virt4(set_virtual_address_map,
memory_map_size, descriptor_size,
descriptor_version, virtual_map);
}
static efi_status_t __init phys_efi_set_virtual_address_map(
unsigned long memory_map_size,
unsigned long descriptor_size,
u32 descriptor_version,
efi_memory_desc_t *virtual_map)
{
efi_status_t status;
efi_call_phys_prelog();
status = efi_call_phys4(efi_phys.set_virtual_address_map,
memory_map_size, descriptor_size,
descriptor_version, virtual_map);
efi_call_phys_epilog();
return status;
}
static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
efi_time_cap_t *tc)
{
efi_status_t status;
efi_call_phys_prelog();
status = efi_call_phys2(efi_phys.get_time, tm, tc);
efi_call_phys_epilog();
return status;
}
int efi_set_rtc_mmss(unsigned long nowtime)
{
int real_seconds, real_minutes;
efi_status_t status;
efi_time_t eft;
efi_time_cap_t cap;
status = efi.get_time(&eft, &cap);
if (status != EFI_SUCCESS) {
printk(KERN_ERR "Oops: efitime: can't read time!\n");
return -1;
}
real_seconds = nowtime % 60;
real_minutes = nowtime / 60;
if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
real_minutes += 30;
real_minutes %= 60;
eft.minute = real_minutes;
eft.second = real_seconds;
status = efi.set_time(&eft);
if (status != EFI_SUCCESS) {
printk(KERN_ERR "Oops: efitime: can't write time!\n");
return -1;
}
return 0;
}
unsigned long efi_get_time(void)
{
efi_status_t status;
efi_time_t eft;
efi_time_cap_t cap;
status = efi.get_time(&eft, &cap);
if (status != EFI_SUCCESS)
printk(KERN_ERR "Oops: efitime: can't read time!\n");
return mktime(eft.year, eft.month, eft.day, eft.hour,
eft.minute, eft.second);
}
/*
* Tell the kernel about the EFI memory map. This might include
* more than the max 128 entries that can fit in the e820 legacy
* (zeropage) memory map.
*/
static void __init do_add_efi_memmap(void)
{
void *p;
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
efi_memory_desc_t *md = p;
unsigned long long start = md->phys_addr;
unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
int e820_type;
if (md->attribute & EFI_MEMORY_WB)
e820_type = E820_RAM;
else
e820_type = E820_RESERVED;
e820_add_region(start, size, e820_type);
}
sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
}
void __init efi_reserve_early(void)
{
unsigned long pmap;
#ifdef CONFIG_X86_32
pmap = boot_params.efi_info.efi_memmap;
#else
pmap = (boot_params.efi_info.efi_memmap |
((__u64)boot_params.efi_info.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;
reserve_early(pmap, pmap + memmap.nr_map * memmap.desc_size,
"EFI memmap");
}
#if EFI_DEBUG
static void __init print_efi_memmap(void)
{
efi_memory_desc_t *md;
void *p;
int i;
for (p = memmap.map, i = 0;
p < memmap.map_end;
p += memmap.desc_size, i++) {
md = p;
printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
"range=[0x%016llx-0x%016llx) (%lluMB)\n",
i, md->type, md->attribute, md->phys_addr,
md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
(md->num_pages >> (20 - EFI_PAGE_SHIFT)));
}
}
#endif /* EFI_DEBUG */
void __init efi_init(void)
{
efi_config_table_t *config_tables;
efi_runtime_services_t *runtime;
efi_char16_t *c16;
char vendor[100] = "unknown";
int i = 0;
void *tmp;
#ifdef CONFIG_X86_32
efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
#else
efi_phys.systab = (efi_system_table_t *)
(boot_params.efi_info.efi_systab |
((__u64)boot_params.efi_info.efi_systab_hi<<32));
#endif
efi.systab = early_ioremap((unsigned long)efi_phys.systab,
sizeof(efi_system_table_t));
if (efi.systab == NULL)
printk(KERN_ERR "Couldn't map the EFI system table!\n");
memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
early_iounmap(efi.systab, sizeof(efi_system_table_t));
efi.systab = &efi_systab;
/*
* Verify the EFI Table
*/
if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
printk(KERN_ERR "EFI system table signature incorrect!\n");
if ((efi.systab->hdr.revision >> 16) == 0)
printk(KERN_ERR "Warning: EFI system table version "
"%d.%02d, expected 1.00 or greater!\n",
efi.systab->hdr.revision >> 16,
efi.systab->hdr.revision & 0xffff);
/*
* Show what we know for posterity
*/
c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
if (c16) {
for (i = 0; i < sizeof(vendor) && *c16; ++i)
vendor[i] = *c16++;
vendor[i] = '\0';
} else
printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
early_iounmap(tmp, 2);
printk(KERN_INFO "EFI v%u.%.02u by %s \n",
efi.systab->hdr.revision >> 16,
efi.systab->hdr.revision & 0xffff, vendor);
/*
* Let's see what config tables the firmware passed to us.
*/
config_tables = early_ioremap(
efi.systab->tables,
efi.systab->nr_tables * sizeof(efi_config_table_t));
if (config_tables == NULL)
printk(KERN_ERR "Could not map EFI Configuration Table!\n");
printk(KERN_INFO);
for (i = 0; i < efi.systab->nr_tables; i++) {
if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
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)) {
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)) {
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)) {
efi.smbios = config_tables[i].table;
printk(" SMBIOS=0x%lx ", config_tables[i].table);
} else if (!efi_guidcmp(config_tables[i].guid,
HCDP_TABLE_GUID)) {
efi.hcdp = config_tables[i].table;
printk(" HCDP=0x%lx ", config_tables[i].table);
} else if (!efi_guidcmp(config_tables[i].guid,
UGA_IO_PROTOCOL_GUID)) {
efi.uga = config_tables[i].table;
printk(" UGA=0x%lx ", config_tables[i].table);
}
}
printk("\n");
early_iounmap(config_tables,
efi.systab->nr_tables * sizeof(efi_config_table_t));
/*
* Check out the runtime services table. We need to map
* the runtime services table so that we can grab the physical
* address of several of the EFI runtime functions, needed to
* set the firmware into virtual mode.
*/
runtime = early_ioremap((unsigned long)efi.systab->runtime,
sizeof(efi_runtime_services_t));
if (runtime != NULL) {
/*
* We will only need *early* access to the following
* two EFI runtime services before set_virtual_address_map
* is invoked.
*/
efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
efi_phys.set_virtual_address_map =
(efi_set_virtual_address_map_t *)
runtime->set_virtual_address_map;
/*
* Make efi_get_time can be called before entering
* virtual mode.
*/
efi.get_time = phys_efi_get_time;
} else
printk(KERN_ERR "Could not map the EFI runtime service "
"table!\n");
early_iounmap(runtime, sizeof(efi_runtime_services_t));
/* Map the EFI memory map */
memmap.map = early_ioremap((unsigned long)memmap.phys_map,
memmap.nr_map * memmap.desc_size);
if (memmap.map == NULL)
printk(KERN_ERR "Could not map the EFI memory map!\n");
memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
if (memmap.desc_size != sizeof(efi_memory_desc_t))
printk(KERN_WARNING "Kernel-defined memdesc"
"doesn't match the one from EFI!\n");
if (add_efi_memmap)
do_add_efi_memmap();
/* Setup for EFI runtime service */
reboot_type = BOOT_EFI;
#if EFI_DEBUG
print_efi_memmap();
#endif
}
static void __init runtime_code_page_mkexec(void)
{
efi_memory_desc_t *md;
void *p;
u64 addr, npages;
/* Make EFI runtime service code area executable */
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
md = p;
if (md->type != EFI_RUNTIME_SERVICES_CODE)
continue;
addr = md->virt_addr;
npages = md->num_pages;
memrange_efi_to_native(&addr, &npages);
set_memory_x(addr, npages);
}
}
/*
* This function will switch the EFI runtime services to virtual mode.
* Essentially, look through the EFI memmap and map every region that
* has the runtime attribute bit set in its memory descriptor and update
* that memory descriptor with the virtual address obtained from ioremap().
* This enables the runtime services to be called without having to
* thunk back into physical mode for every invocation.
*/
void __init efi_enter_virtual_mode(void)
{
efi_memory_desc_t *md;
efi_status_t status;
unsigned long size;
u64 end, systab, addr, npages;
void *p, *va;
efi.systab = NULL;
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
md = p;
if (!(md->attribute & EFI_MEMORY_RUNTIME))
continue;
size = md->num_pages << EFI_PAGE_SHIFT;
end = md->phys_addr + size;
if (PFN_UP(end) <= max_pfn_mapped)
va = __va(md->phys_addr);
else
va = efi_ioremap(md->phys_addr, size);
md->virt_addr = (u64) (unsigned long) va;
if (!va) {
printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
(unsigned long long)md->phys_addr);
continue;
}
if (!(md->attribute & EFI_MEMORY_WB)) {
addr = md->virt_addr;
npages = md->num_pages;
memrange_efi_to_native(&addr, &npages);
set_memory_uc(addr, npages);
}
systab = (u64) (unsigned long) efi_phys.systab;
if (md->phys_addr <= systab && systab < end) {
systab += md->virt_addr - md->phys_addr;
efi.systab = (efi_system_table_t *) (unsigned long) systab;
}
}
BUG_ON(!efi.systab);
status = phys_efi_set_virtual_address_map(
memmap.desc_size * memmap.nr_map,
memmap.desc_size,
memmap.desc_version,
memmap.phys_map);
if (status != EFI_SUCCESS) {
printk(KERN_ALERT "Unable to switch EFI into virtual mode "
"(status=%lx)!\n", status);
panic("EFI call to SetVirtualAddressMap() failed!");
}
/*
* Now that EFI is in virtual mode, update the function
* pointers in the runtime service table to the new virtual addresses.
*
* Call EFI services through wrapper functions.
*/
efi.get_time = virt_efi_get_time;
efi.set_time = virt_efi_set_time;
efi.get_wakeup_time = virt_efi_get_wakeup_time;
efi.set_wakeup_time = virt_efi_set_wakeup_time;
efi.get_variable = virt_efi_get_variable;
efi.get_next_variable = virt_efi_get_next_variable;
efi.set_variable = virt_efi_set_variable;
efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
efi.reset_system = virt_efi_reset_system;
efi.set_virtual_address_map = virt_efi_set_virtual_address_map;
if (__supported_pte_mask & _PAGE_NX)
runtime_code_page_mkexec();
early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
memmap.map = NULL;
}
/*
* Convenience functions to obtain memory types and attributes
*/
u32 efi_mem_type(unsigned long phys_addr)
{
efi_memory_desc_t *md;
void *p;
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
md = p;
if ((md->phys_addr <= phys_addr) &&
(phys_addr < (md->phys_addr +
(md->num_pages << EFI_PAGE_SHIFT))))
return md->type;
}
return 0;
}
u64 efi_mem_attributes(unsigned long phys_addr)
{
efi_memory_desc_t *md;
void *p;
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
md = p;
if ((md->phys_addr <= phys_addr) &&
(phys_addr < (md->phys_addr +
(md->num_pages << EFI_PAGE_SHIFT))))
return md->attribute;
}
return 0;
}