/*
* Extensible Firmware Interface
*
* 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>
*
* 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/config.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/types.h>
#include <linux/time.h>
#include <linux/spinlock.h>
#include <linux/bootmem.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/efi.h>
#include <linux/kexec.h>
#include <asm/setup.h>
#include <asm/io.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/desc.h>
#include <asm/tlbflush.h>
#define EFI_DEBUG 0
#define PFX "EFI: "
extern efi_status_t asmlinkage efi_call_phys(void *, ...);
struct efi efi;
EXPORT_SYMBOL(efi);
static struct efi efi_phys;
struct efi_memory_map memmap;
/*
* We require an early boot_ioremap mapping mechanism initially
*/
extern void * boot_ioremap(unsigned long, unsigned long);
/*
* To make EFI call EFI runtime service in physical addressing mode we need
* prelog/epilog before/after the invocation to disable interrupt, to
* claim EFI runtime service handler exclusively and to duplicate a memory in
* low memory space say 0 - 3G.
*/
static unsigned long efi_rt_eflags;
static DEFINE_SPINLOCK(efi_rt_lock);
static pgd_t efi_bak_pg_dir_pointer[2];
static void efi_call_phys_prelog(void)
{
unsigned long cr4;
unsigned long temp;
spin_lock(&efi_rt_lock);
local_irq_save(efi_rt_eflags);
/*
* If I don't have PSE, I should just duplicate two entries in page
* directory. If I have PSE, I just need to duplicate one entry in
* page directory.
*/
cr4 = read_cr4();
if (cr4 & X86_CR4_PSE) {
efi_bak_pg_dir_pointer[0].pgd =
swapper_pg_dir[pgd_index(0)].pgd;
swapper_pg_dir[0].pgd =
swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd;
} else {
efi_bak_pg_dir_pointer[0].pgd =
swapper_pg_dir[pgd_index(0)].pgd;
efi_bak_pg_dir_pointer[1].pgd =
swapper_pg_dir[pgd_index(0x400000)].pgd;
swapper_pg_dir[pgd_index(0)].pgd =
swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd;
temp = PAGE_OFFSET + 0x400000;
swapper_pg_dir[pgd_index(0x400000)].pgd =
swapper_pg_dir[pgd_index(temp)].pgd;
}
/*
* After the lock is released, the original page table is restored.
*/
local_flush_tlb();
cpu_gdt_descr[0].address = __pa(cpu_gdt_descr[0].address);
load_gdt((struct Xgt_desc_struct *) __pa(&cpu_gdt_descr[0]));
}
static void efi_call_phys_epilog(void)
{
unsigned long cr4;
cpu_gdt_descr[0].address =
(unsigned long) __va(cpu_gdt_descr[0].address);
load_gdt(&cpu_gdt_descr[0]);
cr4 = read_cr4();
if (cr4 & X86_CR4_PSE) {
swapper_pg_dir[pgd_index(0)].pgd =
efi_bak_pg_dir_pointer[0].pgd;
} else {
swapper_pg_dir[pgd_index(0)].pgd =
efi_bak_pg_dir_pointer[0].pgd;
swapper_pg_dir[pgd_index(0x400000)].pgd =
efi_bak_pg_dir_pointer[1].pgd;
}
/*
* After the lock is released, the original page table is restored.
*/
local_flush_tlb();
local_irq_restore(efi_rt_eflags);
spin_unlock(&efi_rt_lock);
}
static efi_status_t
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_phys(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
phys_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
{
efi_status_t status;
efi_call_phys_prelog();
status = efi_call_phys(efi_phys.get_time, tm, tc);
efi_call_phys_epilog();
return status;
}
inline 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;
spin_lock(&efi_rt_lock);
status = efi.get_time(&eft, &cap);
spin_unlock(&efi_rt_lock);
if (status != EFI_SUCCESS)
panic("Ooops, efitime: can't read time!\n");
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;
if (status != EFI_SUCCESS) {
printk("Ooops: efitime: can't read time!\n");
return -1;
}
return 0;
}
/*
* This should only be used during kernel init and before runtime
* services have been remapped, therefore, we'll need to call in physical
* mode. Note, this call isn't used later, so mark it __init.
*/
inline unsigned long __init efi_get_time(void)
{
efi_status_t status;
efi_time_t eft;
efi_time_cap_t cap;
status = phys_efi_get_time(&eft, &cap);
if (status != EFI_SUCCESS)
printk("Oops: efitime: can't read time status: 0x%lx\n",status);
return mktime(eft.year, eft.month, eft.day, eft.hour,
eft.minute, eft.second);
}
int is_available_memory(efi_memory_desc_t * md)
{
if (!(md->attribute & EFI_MEMORY_WB))
return 0;
switch (md->type) {
case EFI_LOADER_CODE:
case EFI_LOADER_DATA:
case EFI_BOOT_SERVICES_CODE:
case EFI_BOOT_SERVICES_DATA:
case EFI_CONVENTIONAL_MEMORY:
return 1;
}
return 0;
}
/*
* We need to map the EFI memory map again after paging_init().
*/
void __init efi_map_memmap(void)
{
memmap.map = NULL;
memmap.map = bt_ioremap((unsigned long) memmap.phys_map,
(memmap.nr_map * memmap.desc_size));
if (memmap.map == NULL)
printk(KERN_ERR PFX "Could not remap the EFI memmap!\n");
memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
}
#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 "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 */
/*
* Walks the EFI memory map and calls CALLBACK once for each EFI
* memory descriptor that has memory that is available for kernel use.
*/
void efi_memmap_walk(efi_freemem_callback_t callback, void *arg)
{
int prev_valid = 0;
struct range {
unsigned long start;
unsigned long end;
} prev, curr;
efi_memory_desc_t *md;
unsigned long start, end;
void *p;
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
md = p;
if ((md->num_pages == 0) || (!is_available_memory(md)))
continue;
curr.start = md->phys_addr;
curr.end = curr.start + (md->num_pages << EFI_PAGE_SHIFT);
if (!prev_valid) {
prev = curr;
prev_valid = 1;
} else {
if (curr.start < prev.start)
printk(KERN_INFO PFX "Unordered memory map\n");
if (prev.end == curr.start)
prev.end = curr.end;
else {
start =
(unsigned long) (PAGE_ALIGN(prev.start));
end = (unsigned long) (prev.end & PAGE_MASK);
if ((end > start)
&& (*callback) (start, end, arg) < 0)
return;
prev = curr;
}
}
}
if (prev_valid) {
start = (unsigned long) PAGE_ALIGN(prev.start);
end = (unsigned long) (prev.end & PAGE_MASK);
if (end > start)
(*callback) (start, end, arg);
}
}
void __init efi_init(void)
{
efi_config_table_t *config_tables;
efi_runtime_services_t *runtime;
efi_char16_t *c16;
char vendor[100] = "unknown";
unsigned long num_config_tables;
int i = 0;
memset(&efi, 0, sizeof(efi) );
memset(&efi_phys, 0, sizeof(efi_phys));
efi_phys.systab = EFI_SYSTAB;
memmap.phys_map = EFI_MEMMAP;
memmap.nr_map = EFI_MEMMAP_SIZE/EFI_MEMDESC_SIZE;
memmap.desc_version = EFI_MEMDESC_VERSION;
memmap.desc_size = EFI_MEMDESC_SIZE;
efi.systab = (efi_system_table_t *)
boot_ioremap((unsigned long) efi_phys.systab,
sizeof(efi_system_table_t));
/*
* Verify the EFI Table
*/
if (efi.systab == NULL)
printk(KERN_ERR PFX "Woah! Couldn't map the EFI system table.\n");
if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
printk(KERN_ERR PFX "Woah! EFI system table signature incorrect\n");
if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
printk(KERN_ERR PFX
"Warning: EFI system table major version mismatch: "
"got %d.%02d, expected %d.%02d\n",
efi.systab->hdr.revision >> 16,
efi.systab->hdr.revision & 0xffff,
EFI_SYSTEM_TABLE_REVISION >> 16,
EFI_SYSTEM_TABLE_REVISION & 0xffff);
/*
* Grab some details from the system table
*/
num_config_tables = efi.systab->nr_tables;
config_tables = (efi_config_table_t *)efi.systab->tables;
runtime = efi.systab->runtime;
/*
* Show what we know for posterity
*/
c16 = (efi_char16_t *) boot_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");
printk(KERN_INFO PFX "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 = (efi_config_table_t *)
boot_ioremap((unsigned long) config_tables,
num_config_tables * sizeof(efi_config_table_t));
if (config_tables == NULL)
printk(KERN_ERR PFX "Could not map EFI Configuration Table!\n");
for (i = 0; i < num_config_tables; i++) {
if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
efi.mps = (void *)config_tables[i].table;
printk(KERN_INFO " 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);
printk(KERN_INFO " 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);
printk(KERN_INFO " ACPI=0x%lx ", config_tables[i].table);
} else
if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
efi.smbios = (void *) config_tables[i].table;
printk(KERN_INFO " SMBIOS=0x%lx ", config_tables[i].table);
} else
if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
efi.hcdp = (void *)config_tables[i].table;
printk(KERN_INFO " HCDP=0x%lx ", config_tables[i].table);
} else
if (efi_guidcmp(config_tables[i].guid, UGA_IO_PROTOCOL_GUID) == 0) {
efi.uga = (void *)config_tables[i].table;
printk(KERN_INFO " UGA=0x%lx ", config_tables[i].table);
}
}
printk("\n");
/*
* 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 = (efi_runtime_services_t *) boot_ioremap((unsigned long)
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;
} else
printk(KERN_ERR PFX "Could not map the runtime service table!\n");
/* Map the EFI memory map for use until paging_init() */
memmap.map = boot_ioremap((unsigned long) EFI_MEMMAP, EFI_MEMMAP_SIZE);
if (memmap.map == NULL)
printk(KERN_ERR PFX "Could not map the EFI memory map!\n");
memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
#if EFI_DEBUG
print_efi_memmap();
#endif
}
static inline void __init check_range_for_systab(efi_memory_desc_t *md)
{
if (((unsigned long)md->phys_addr <= (unsigned long)efi_phys.systab) &&
((unsigned long)efi_phys.systab < md->phys_addr +
((unsigned long)md->num_pages << EFI_PAGE_SHIFT))) {
unsigned long addr;
addr = md->virt_addr - md->phys_addr +
(unsigned long)efi_phys.systab;
efi.systab = (efi_system_table_t *)addr;
}
}
/*
* 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;
void *p;
efi.systab = NULL;
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
md = p;
if (!(md->attribute & EFI_MEMORY_RUNTIME))
continue;
md->virt_addr = (unsigned long)ioremap(md->phys_addr,
md->num_pages << EFI_PAGE_SHIFT);
if (!(unsigned long)md->virt_addr) {
printk(KERN_ERR PFX "ioremap of 0x%lX failed\n",
(unsigned long)md->phys_addr);
}
/* update the virtual address of the EFI system table */
check_range_for_systab(md);
}
if (!efi.systab)
BUG();
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 "You are screwed! "
"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.
*/
efi.get_time = (efi_get_time_t *) efi.systab->runtime->get_time;
efi.set_time = (efi_set_time_t *) efi.systab->runtime->set_time;
efi.get_wakeup_time = (efi_get_wakeup_time_t *)
efi.systab->runtime->get_wakeup_time;
efi.set_wakeup_time = (efi_set_wakeup_time_t *)
efi.systab->runtime->set_wakeup_time;
efi.get_variable = (efi_get_variable_t *)
efi.systab->runtime->get_variable;
efi.get_next_variable = (efi_get_next_variable_t *)
efi.systab->runtime->get_next_variable;
efi.set_variable = (efi_set_variable_t *)
efi.systab->runtime->set_variable;
efi.get_next_high_mono_count = (efi_get_next_high_mono_count_t *)
efi.systab->runtime->get_next_high_mono_count;
efi.reset_system = (efi_reset_system_t *)
efi.systab->runtime->reset_system;
}
void __init
efi_initialize_iomem_resources(struct resource *code_resource,
struct resource *data_resource)
{
struct resource *res;
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 + (md->num_pages << EFI_PAGE_SHIFT)) >
0x100000000ULL)
continue;
res = alloc_bootmem_low(sizeof(struct resource));
switch (md->type) {
case EFI_RESERVED_TYPE:
res->name = "Reserved Memory";
break;
case EFI_LOADER_CODE:
res->name = "Loader Code";
break;
case EFI_LOADER_DATA:
res->name = "Loader Data";
break;
case EFI_BOOT_SERVICES_DATA:
res->name = "BootServices Data";
break;
case EFI_BOOT_SERVICES_CODE:
res->name = "BootServices Code";
break;
case EFI_RUNTIME_SERVICES_CODE:
res->name = "Runtime Service Code";
break;
case EFI_RUNTIME_SERVICES_DATA:
res->name = "Runtime Service Data";
break;
case EFI_CONVENTIONAL_MEMORY:
res->name = "Conventional Memory";
break;
case EFI_UNUSABLE_MEMORY:
res->name = "Unusable Memory";
break;
case EFI_ACPI_RECLAIM_MEMORY:
res->name = "ACPI Reclaim";
break;
case EFI_ACPI_MEMORY_NVS:
res->name = "ACPI NVS";
break;
case EFI_MEMORY_MAPPED_IO:
res->name = "Memory Mapped IO";
break;
case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
res->name = "Memory Mapped IO Port Space";
break;
default:
res->name = "Reserved";
break;
}
res->start = md->phys_addr;
res->end = res->start + ((md->num_pages << EFI_PAGE_SHIFT) - 1);
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
if (request_resource(&iomem_resource, res) < 0)
printk(KERN_ERR PFX "Failed to allocate res %s : 0x%lx-0x%lx\n",
res->name, res->start, res->end);
/*
* We don't know which region contains kernel data so we try
* it repeatedly and let the resource manager test it.
*/
if (md->type == EFI_CONVENTIONAL_MEMORY) {
request_resource(res, code_resource);
request_resource(res, data_resource);
#ifdef CONFIG_KEXEC
request_resource(res, &crashk_res);
#endif
}
}
}
/*
* 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;
}
