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/*
* Extensible Firmware Interface
*
* Based on Extensible Firmware Interface Specification version 0.9 April 30, 1999
*
* Copyright (C) 1999 VA Linux Systems
* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
* Copyright (C) 1999-2001 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/types.h>
#include <linux/time.h>
#include <linux/proc_fs.h>
#include <asm/efi.h>
#include <asm/io.h>
#include <asm/kregs.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#define EFI_DEBUG 0
extern efi_status_t efi_call_phys (void *, ...);
struct efi efi;
static efi_runtime_services_t *runtime;
/*
* efi_dir is allocated here, but the directory isn't created
* here, as proc_mkdir() doesn't work this early in the bootup
* process. Therefore, each module, like efivars, must test for
* if (!efi_dir) efi_dir = proc_mkdir("efi", NULL);
* prior to creating their own entries under /proc/efi.
*/
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *efi_dir = NULL;
#endif
static unsigned long mem_limit = ~0UL;
static efi_status_t
phys_get_time (efi_time_t *tm, efi_time_cap_t *tc)
{
return efi_call_phys(__va(runtime->get_time), __pa(tm), __pa(tc));
}
static efi_status_t
phys_set_time (efi_time_t *tm)
{
return efi_call_phys(__va(runtime->set_time), __pa(tm));
}
static efi_status_t
phys_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, efi_time_t *tm)
{
return efi_call_phys(__va(runtime->get_wakeup_time), __pa(enabled), __pa(pending),
__pa(tm));
}
static efi_status_t
phys_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)
{
return efi_call_phys(__va(runtime->set_wakeup_time), enabled, __pa(tm));
}
static efi_status_t
phys_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,
unsigned long *data_size, void *data)
{
return efi_call_phys(__va(runtime->get_variable), __pa(name), __pa(vendor), __pa(attr),
__pa(data_size), __pa(data));
}
static efi_status_t
phys_get_next_variable (unsigned long *name_size, efi_char16_t *name, efi_guid_t *vendor)
{
return efi_call_phys(__va(runtime->get_next_variable), __pa(name_size), __pa(name),
__pa(vendor));
}
static efi_status_t
phys_set_variable (efi_char16_t *name, efi_guid_t *vendor, u32 attr,
unsigned long data_size, void *data)
{
return efi_call_phys(__va(runtime->set_variable), __pa(name), __pa(vendor), attr,
data_size, __pa(data));
}
static efi_status_t
phys_get_next_high_mono_count (u64 *count)
{
return efi_call_phys(__va(runtime->get_next_high_mono_count), __pa(count));
}
static void
phys_reset_system (int reset_type, efi_status_t status,
unsigned long data_size, efi_char16_t *data)
{
efi_call_phys(__va(runtime->reset_system), status, data_size, __pa(data));
}
void
efi_gettimeofday (struct timeval *tv)
{
efi_time_t tm;
memset(tv, 0, sizeof(tv));
if ((*efi.get_time)(&tm, 0) != EFI_SUCCESS)
return;
tv->tv_sec = mktime(tm.year, tm.month, tm.day, tm.hour, tm.minute, tm.second);
tv->tv_usec = tm.nanosecond / 1000;
}
/*
* Walks the EFI memory map and calls CALLBACK once for each EFI
* memory descriptor that has memory that is available for OS use.
*/
void
efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
{
int prev_valid = 0;
struct range {
u64 start;
u64 end;
} prev, curr;
void *efi_map_start, *efi_map_end, *p;
efi_memory_desc_t *md;
u64 efi_desc_size, start, end;
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;
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:
if (!(md->attribute & EFI_MEMORY_WB))
continue;
if (md->phys_addr + (md->num_pages << 12) > mem_limit) {
if (md->phys_addr > mem_limit)
continue;
md->num_pages = (mem_limit - md->phys_addr) >> 12;
}
if (md->num_pages == 0) {
printk("efi_memmap_walk: ignoring empty region at 0x%lx",
md->phys_addr);
continue;
}
curr.start = PAGE_OFFSET + md->phys_addr;
curr.end = curr.start + (md->num_pages << 12);
if (!prev_valid) {
prev = curr;
prev_valid = 1;
} else {
if (curr.start < prev.start)
printk("Oops: EFI memory table not ordered!\n");
if (prev.end == curr.start) {
/* merge two consecutive memory ranges */
prev.end = curr.end;
} else {
start = PAGE_ALIGN(prev.start);
end = prev.end & PAGE_MASK;
if ((end > start) && (*callback)(start, end, arg) < 0)
return;
prev = curr;
}
}
break;
default:
continue;
}
}
if (prev_valid) {
start = PAGE_ALIGN(prev.start);
end = prev.end & PAGE_MASK;
if (end > start)
(*callback)(start, end, arg);
}
}
/*
* Look for the PAL_CODE region reported by EFI and maps it using an
* ITR to enable safe PAL calls in virtual mode. See IA-64 Processor
* Abstraction Layer chapter 11 in ADAG
*/
void
efi_map_pal_code (void)
{
void *efi_map_start, *efi_map_end, *p;
efi_memory_desc_t *md;
u64 efi_desc_size;
int pal_code_count=0;
u64 mask, flags;
u64 vaddr;
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 (md->type != EFI_PAL_CODE)
continue;
if (++pal_code_count > 1) {
printk(KERN_ERR "Too many EFI Pal Code memory ranges, dropped @ %lx\n",
md->phys_addr);
continue;
}
/*
* The only ITLB entry in region 7 that is used is the one installed by
* __start(). That entry covers a 64MB range.
*/
mask = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
vaddr = PAGE_OFFSET + md->phys_addr;
/*
* We must check that the PAL mapping won't overlap with the kernel
* mapping.
*
* PAL code is guaranteed to be aligned on a power of 2 between 4k and
* 256KB and that only one ITR is needed to map it. This implies that the
* PAL code is always aligned on its size, i.e., the closest matching page
* size supported by the TLB. Therefore PAL code is guaranteed never to
* cross a 64MB unless it is bigger than 64MB (very unlikely!). So for
* now the following test is enough to determine whether or not we need a
* dedicated ITR for the PAL code.
*/
if ((vaddr & mask) == (KERNEL_START & mask)) {
printk(__FUNCTION__ ": no need to install ITR for PAL code\n");
continue;
}
if (md->num_pages << 12 > IA64_GRANULE_SIZE)
panic("Woah! PAL code size bigger than a granule!");
mask = ~((1 << IA64_GRANULE_SHIFT) - 1);
printk("CPU %d: mapping PAL code [0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
smp_processor_id(), md->phys_addr, md->phys_addr + (md->num_pages << 12),
vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
/*
* Cannot write to CRx with PSR.ic=1
*/
ia64_clear_ic(flags);
ia64_itr(0x1, IA64_TR_PALCODE, vaddr & mask,
pte_val(mk_pte_phys(md->phys_addr, PAGE_KERNEL)), IA64_GRANULE_SHIFT);
local_irq_restore(flags);
ia64_srlz_i();
}
}
void __init
efi_init (void)
{
void *efi_map_start, *efi_map_end;
efi_config_table_t *config_tables;
efi_char16_t *c16;
u64 efi_desc_size;
char *cp, *end, 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) - 1;
if (end != cp)
break;
cp = end;
} else {
while (*cp != ' ' && *cp)
++cp;
while (*cp == ' ')
++cp;
}
}
if (mem_limit != ~0UL)
printk("Ignoring memory above %luMB\n", mem_limit >> 20);
efi.systab = __va(ia64_boot_param->efi_systab);
/*
* Verify the EFI Table
*/
if (efi.systab == NULL)
panic("Woah! Can't find EFI system table.\n");
if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
panic("Woah! EFI system table signature incorrect\n");
if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
printk("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);
config_tables = __va(efi.systab->tables);
/* Show what we know for posterity */
c16 = __va(efi.systab->fw_vendor);
if (c16) {
for (i = 0;i < sizeof(vendor) && *c16; ++i)
vendor[i] = *c16++;
vendor[i] = '\0';
}
printk("EFI v%u.%.02u by %s:",
efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor);
for (i = 0; i < efi.systab->nr_tables; i++) {
if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
efi.mps = __va(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);
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);
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);
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);
printk(" SALsystab=0x%lx", config_tables[i].table);
}
}
printk("\n");
runtime = __va(efi.systab->runtime);
efi.get_time = phys_get_time;
efi.set_time = phys_set_time;
efi.get_wakeup_time = phys_get_wakeup_time;
efi.set_wakeup_time = phys_set_wakeup_time;
efi.get_variable = phys_get_variable;
efi.get_next_variable = phys_get_next_variable;
efi.set_variable = phys_set_variable;
efi.get_next_high_mono_count = phys_get_next_high_mono_count;
efi.reset_system = phys_reset_system;
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 EFI_DEBUG
/* print EFI memory map: */
{
efi_memory_desc_t *md;
void *p;
for (i = 0, p = efi_map_start; p < efi_map_end; ++i, p += efi_desc_size) {
md = p;
printk("mem%02u: type=%u, attr=0x%lx, range=[0x%016lx-0x%016lx) (%luMB)\n",
i, md->type, md->attribute, md->phys_addr,
md->phys_addr + (md->num_pages<<12) - 1, md->num_pages >> 8);
}
}
#endif
efi_map_pal_code();
efi_enter_virtual_mode();
}
void
efi_enter_virtual_mode (void)
{
void *efi_map_start, *efi_map_end, *p;
efi_memory_desc_t *md;
efi_status_t status;
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 (md->attribute & EFI_MEMORY_RUNTIME) {
/*
* Some descriptors have multiple bits set, so the order of
* the tests is relevant.
*/
if (md->attribute & EFI_MEMORY_WB) {
md->virt_addr = (u64) __va(md->phys_addr);
} else if (md->attribute & EFI_MEMORY_UC) {
md->virt_addr = (u64) ioremap(md->phys_addr, 0);
} else if (md->attribute & EFI_MEMORY_WC) {
#if 0
md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
| _PAGE_D
| _PAGE_MA_WC
| _PAGE_PL_0
| _PAGE_AR_RW));
#else
printk("EFI_MEMORY_WC mapping\n");
md->virt_addr = (u64) ioremap(md->phys_addr, 0);
#endif
} else if (md->attribute & EFI_MEMORY_WT) {
#if 0
md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
| _PAGE_D | _PAGE_MA_WT
| _PAGE_PL_0
| _PAGE_AR_RW));
#else
printk("EFI_MEMORY_WT mapping\n");
md->virt_addr = (u64) ioremap(md->phys_addr, 0);
#endif
}
}
}
status = efi_call_phys(__va(runtime->set_virtual_address_map),
ia64_boot_param->efi_memmap_size,
efi_desc_size, ia64_boot_param->efi_memdesc_version,
ia64_boot_param->efi_memmap);
if (status != EFI_SUCCESS) {
printk("Warning: unable to switch EFI into virtual mode (status=%lu)\n", status);
return;
}
/*
* Now that EFI is in virtual mode, we arrange for EFI functions to be
* called directly:
*/
efi.get_time = __va(runtime->get_time);
efi.set_time = __va(runtime->set_time);
efi.get_wakeup_time = __va(runtime->get_wakeup_time);
efi.set_wakeup_time = __va(runtime->set_wakeup_time);
efi.get_variable = __va(runtime->get_variable);
efi.get_next_variable = __va(runtime->get_next_variable);
efi.set_variable = __va(runtime->set_variable);
efi.get_next_high_mono_count = __va(runtime->get_next_high_mono_count);
efi.reset_system = __va(runtime->reset_system);
}
/*
* Walk the EFI memory map looking for the I/O port range. There can only be one entry of
* this type, other I/O port ranges should be described via ACPI.
*/
u64
efi_get_iobase (void)
{
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 (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
/* paranoia attribute checking */
if (md->attribute == (EFI_MEMORY_UC | EFI_MEMORY_RUNTIME))
return md->phys_addr;
}
}
return 0;
}
static void __exit
efivars_exit(void)
{
#ifdef CONFIG_PROC_FS
remove_proc_entry(efi_dir->name, NULL);
#endif
}
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