x86: EFI runtime service support
This patch adds basic runtime services support for EFI x86_64 system. The main file of the patch is the addition of efi_64.c for x86_64. This file is modeled after the EFI IA32 avatar. EFI runtime services initialization are implemented in efi_64.c. Some x86_64 specifics are worth noting here. On x86_64, parameters passed to EFI firmware services need to follow the EFI calling convention. For this purpose, a set of functions named efi_call<x> (<x> is the number of parameters) are implemented. EFI function calls are wrapped before calling the firmware service. The duplicated code between efi_32.c and efi_64.c is placed in efi.c to remove them from efi_32.c. Signed-off-by: Chandramouli Narayanan <mouli@linux.intel.com> Signed-off-by: Huang Ying <ying.huang@intel.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Huang, Ying
Ingo Molnar
480
arch/x86/kernel/efi.c
Normal file
480
arch/x86/kernel/efi.c
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@@ -0,0 +1,480 @@
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/*
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* Common EFI (Extensible Firmware Interface) support functions
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* Based on Extensible Firmware Interface Specification version 1.0
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*
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* Copyright (C) 1999 VA Linux Systems
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* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
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* Copyright (C) 1999-2002 Hewlett-Packard Co.
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* David Mosberger-Tang <davidm@hpl.hp.com>
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* Stephane Eranian <eranian@hpl.hp.com>
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* Copyright (C) 2005-2008 Intel Co.
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* Fenghua Yu <fenghua.yu@intel.com>
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* Bibo Mao <bibo.mao@intel.com>
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* Chandramouli Narayanan <mouli@linux.intel.com>
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* Huang Ying <ying.huang@intel.com>
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*
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* Copied from efi_32.c to eliminate the duplicated code between EFI
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* 32/64 support code. --ying 2007-10-26
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*
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* All EFI Runtime Services are not implemented yet as EFI only
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* supports physical mode addressing on SoftSDV. This is to be fixed
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* in a future version. --drummond 1999-07-20
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*
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* Implemented EFI runtime services and virtual mode calls. --davidm
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*
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* Goutham Rao: <goutham.rao@intel.com>
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* Skip non-WB memory and ignore empty memory ranges.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/efi.h>
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#include <linux/bootmem.h>
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#include <linux/spinlock.h>
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#include <linux/uaccess.h>
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#include <linux/time.h>
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#include <linux/io.h>
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#include <linux/reboot.h>
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#include <linux/bcd.h>
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#include <asm/setup.h>
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#include <asm/efi.h>
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#include <asm/time.h>
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#define EFI_DEBUG 1
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#define PFX "EFI: "
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int efi_enabled;
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EXPORT_SYMBOL(efi_enabled);
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struct efi efi;
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EXPORT_SYMBOL(efi);
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struct efi_memory_map memmap;
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struct efi efi_phys __initdata;
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static efi_system_table_t efi_systab __initdata;
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static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
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{
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return efi_call_virt2(get_time, tm, tc);
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}
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static efi_status_t virt_efi_set_time(efi_time_t *tm)
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{
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return efi_call_virt1(set_time, tm);
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}
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static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
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efi_bool_t *pending,
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efi_time_t *tm)
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{
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return efi_call_virt3(get_wakeup_time,
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enabled, pending, tm);
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}
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static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
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{
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return efi_call_virt2(set_wakeup_time,
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enabled, tm);
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}
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static efi_status_t virt_efi_get_variable(efi_char16_t *name,
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efi_guid_t *vendor,
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u32 *attr,
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unsigned long *data_size,
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void *data)
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{
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return efi_call_virt5(get_variable,
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name, vendor, attr,
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data_size, data);
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}
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static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
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efi_char16_t *name,
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efi_guid_t *vendor)
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{
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return efi_call_virt3(get_next_variable,
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name_size, name, vendor);
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}
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static efi_status_t virt_efi_set_variable(efi_char16_t *name,
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efi_guid_t *vendor,
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unsigned long attr,
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unsigned long data_size,
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void *data)
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{
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return efi_call_virt5(set_variable,
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name, vendor, attr,
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data_size, data);
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}
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static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
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{
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return efi_call_virt1(get_next_high_mono_count, count);
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}
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static void virt_efi_reset_system(int reset_type,
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efi_status_t status,
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unsigned long data_size,
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efi_char16_t *data)
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{
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efi_call_virt4(reset_system, reset_type, status,
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data_size, data);
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}
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static efi_status_t virt_efi_set_virtual_address_map(
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unsigned long memory_map_size,
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unsigned long descriptor_size,
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u32 descriptor_version,
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efi_memory_desc_t *virtual_map)
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{
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return efi_call_virt4(set_virtual_address_map,
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memory_map_size, descriptor_size,
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descriptor_version, virtual_map);
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}
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static efi_status_t __init phys_efi_set_virtual_address_map(
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unsigned long memory_map_size,
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unsigned long descriptor_size,
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u32 descriptor_version,
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efi_memory_desc_t *virtual_map)
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{
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efi_status_t status;
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efi_call_phys_prelog();
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status = efi_call_phys4(efi_phys.set_virtual_address_map,
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memory_map_size, descriptor_size,
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descriptor_version, virtual_map);
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efi_call_phys_epilog();
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return status;
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}
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static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
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efi_time_cap_t *tc)
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{
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efi_status_t status;
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efi_call_phys_prelog();
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status = efi_call_phys2(efi_phys.get_time, tm, tc);
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efi_call_phys_epilog();
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return status;
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}
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int efi_set_rtc_mmss(unsigned long nowtime)
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{
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int real_seconds, real_minutes;
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efi_status_t status;
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efi_time_t eft;
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efi_time_cap_t cap;
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status = efi.get_time(&eft, &cap);
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if (status != EFI_SUCCESS) {
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printk(KERN_ERR "Oops: efitime: can't read time!\n");
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return -1;
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}
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real_seconds = nowtime % 60;
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real_minutes = nowtime / 60;
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if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
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real_minutes += 30;
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real_minutes %= 60;
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eft.minute = real_minutes;
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eft.second = real_seconds;
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status = efi.set_time(&eft);
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if (status != EFI_SUCCESS) {
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printk(KERN_ERR "Oops: efitime: can't write time!\n");
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return -1;
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}
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return 0;
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}
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unsigned long efi_get_time(void)
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{
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efi_status_t status;
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efi_time_t eft;
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efi_time_cap_t cap;
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status = efi.get_time(&eft, &cap);
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if (status != EFI_SUCCESS)
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printk(KERN_ERR "Oops: efitime: can't read time!\n");
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return mktime(eft.year, eft.month, eft.day, eft.hour,
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eft.minute, eft.second);
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}
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#if EFI_DEBUG
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static void __init print_efi_memmap(void)
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{
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efi_memory_desc_t *md;
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void *p;
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int i;
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for (p = memmap.map, i = 0;
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p < memmap.map_end;
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p += memmap.desc_size, i++) {
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md = p;
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printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
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"range=[0x%016llx-0x%016llx) (%lluMB)\n",
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i, md->type, md->attribute, md->phys_addr,
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md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
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(md->num_pages >> (20 - EFI_PAGE_SHIFT)));
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}
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}
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#endif /* EFI_DEBUG */
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void __init efi_init(void)
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{
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efi_config_table_t *config_tables;
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efi_runtime_services_t *runtime;
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efi_char16_t *c16;
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char vendor[100] = "unknown";
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int i = 0;
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void *tmp;
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#ifdef CONFIG_X86_32
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efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
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memmap.phys_map = (void *)boot_params.efi_info.efi_memmap;
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#else
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efi_phys.systab = (efi_system_table_t *)
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(boot_params.efi_info.efi_systab |
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((__u64)boot_params.efi_info.efi_systab_hi<<32));
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memmap.phys_map = (void *)
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(boot_params.efi_info.efi_memmap |
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((__u64)boot_params.efi_info.efi_memmap_hi<<32));
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#endif
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memmap.nr_map = boot_params.efi_info.efi_memmap_size /
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boot_params.efi_info.efi_memdesc_size;
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memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
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memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
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efi.systab = efi_early_ioremap((unsigned long)efi_phys.systab,
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sizeof(efi_system_table_t));
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if (efi.systab == NULL)
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printk(KERN_ERR "Couldn't map the EFI system table!\n");
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memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
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efi_early_iounmap(efi.systab, sizeof(efi_system_table_t));
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efi.systab = &efi_systab;
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/*
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* Verify the EFI Table
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*/
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if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
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printk(KERN_ERR "EFI system table signature incorrect!\n");
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if ((efi.systab->hdr.revision >> 16) == 0)
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printk(KERN_ERR "Warning: EFI system table version "
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"%d.%02d, expected 1.00 or greater!\n",
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efi.systab->hdr.revision >> 16,
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efi.systab->hdr.revision & 0xffff);
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/*
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* Show what we know for posterity
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*/
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c16 = tmp = efi_early_ioremap(efi.systab->fw_vendor, 2);
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if (c16) {
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for (i = 0; i < sizeof(vendor) && *c16; ++i)
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vendor[i] = *c16++;
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vendor[i] = '\0';
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} else
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printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
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efi_early_iounmap(tmp, 2);
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printk(KERN_INFO "EFI v%u.%.02u by %s \n",
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efi.systab->hdr.revision >> 16,
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efi.systab->hdr.revision & 0xffff, vendor);
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/*
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* Let's see what config tables the firmware passed to us.
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*/
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config_tables = efi_early_ioremap(
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efi.systab->tables,
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efi.systab->nr_tables * sizeof(efi_config_table_t));
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if (config_tables == NULL)
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printk(KERN_ERR "Could not map EFI Configuration Table!\n");
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printk(KERN_INFO);
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for (i = 0; i < efi.systab->nr_tables; i++) {
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if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
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efi.mps = config_tables[i].table;
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printk(" MPS=0x%lx ", config_tables[i].table);
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} else if (!efi_guidcmp(config_tables[i].guid,
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ACPI_20_TABLE_GUID)) {
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efi.acpi20 = config_tables[i].table;
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printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
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} else if (!efi_guidcmp(config_tables[i].guid,
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ACPI_TABLE_GUID)) {
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efi.acpi = config_tables[i].table;
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printk(" ACPI=0x%lx ", config_tables[i].table);
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} else if (!efi_guidcmp(config_tables[i].guid,
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SMBIOS_TABLE_GUID)) {
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efi.smbios = config_tables[i].table;
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printk(" SMBIOS=0x%lx ", config_tables[i].table);
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} else if (!efi_guidcmp(config_tables[i].guid,
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HCDP_TABLE_GUID)) {
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efi.hcdp = config_tables[i].table;
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printk(" HCDP=0x%lx ", config_tables[i].table);
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} else if (!efi_guidcmp(config_tables[i].guid,
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UGA_IO_PROTOCOL_GUID)) {
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efi.uga = config_tables[i].table;
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printk(" UGA=0x%lx ", config_tables[i].table);
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}
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}
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printk("\n");
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efi_early_iounmap(config_tables,
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efi.systab->nr_tables * sizeof(efi_config_table_t));
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/*
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* Check out the runtime services table. We need to map
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* the runtime services table so that we can grab the physical
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* address of several of the EFI runtime functions, needed to
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* set the firmware into virtual mode.
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*/
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runtime = efi_early_ioremap((unsigned long)efi.systab->runtime,
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sizeof(efi_runtime_services_t));
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if (runtime != NULL) {
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/*
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* We will only need *early* access to the following
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* two EFI runtime services before set_virtual_address_map
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* is invoked.
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*/
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efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
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efi_phys.set_virtual_address_map =
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(efi_set_virtual_address_map_t *)
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runtime->set_virtual_address_map;
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/*
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* Make efi_get_time can be called before entering
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* virtual mode.
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*/
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efi.get_time = phys_efi_get_time;
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} else
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printk(KERN_ERR "Could not map the EFI runtime service "
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"table!\n");
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efi_early_iounmap(runtime, sizeof(efi_runtime_services_t));
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/* Map the EFI memory map */
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memmap.map = efi_early_ioremap((unsigned long)memmap.phys_map,
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memmap.nr_map * memmap.desc_size);
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if (memmap.map == NULL)
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printk(KERN_ERR "Could not map the EFI memory map!\n");
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memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
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if (memmap.desc_size != sizeof(efi_memory_desc_t))
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printk(KERN_WARNING "Kernel-defined memdesc"
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"doesn't match the one from EFI!\n");
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#ifdef CONFIG_X86_64
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/* Setup for EFI runtime service */
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reboot_type = BOOT_EFI;
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#endif
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#if EFI_DEBUG
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print_efi_memmap();
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#endif
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}
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/*
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* This function will switch the EFI runtime services to virtual mode.
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* Essentially, look through the EFI memmap and map every region that
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* has the runtime attribute bit set in its memory descriptor and update
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* that memory descriptor with the virtual address obtained from ioremap().
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* This enables the runtime services to be called without having to
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* thunk back into physical mode for every invocation.
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*/
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void __init efi_enter_virtual_mode(void)
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{
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efi_memory_desc_t *md;
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efi_status_t status;
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unsigned long end;
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void *p;
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efi.systab = NULL;
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for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
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md = p;
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if (!(md->attribute & EFI_MEMORY_RUNTIME))
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continue;
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if ((md->attribute & EFI_MEMORY_WB) &&
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(((md->phys_addr + (md->num_pages<<EFI_PAGE_SHIFT)) >>
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PAGE_SHIFT) < end_pfn_map))
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md->virt_addr = (unsigned long)__va(md->phys_addr);
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else
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md->virt_addr = (unsigned long)
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efi_ioremap(md->phys_addr,
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md->num_pages << EFI_PAGE_SHIFT);
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if (!md->virt_addr)
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printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
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(unsigned long long)md->phys_addr);
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end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
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if ((md->phys_addr <= (unsigned long)efi_phys.systab) &&
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((unsigned long)efi_phys.systab < end))
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efi.systab = (efi_system_table_t *)(unsigned long)
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(md->virt_addr - md->phys_addr +
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(unsigned long)efi_phys.systab);
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}
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BUG_ON(!efi.systab);
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status = phys_efi_set_virtual_address_map(
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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;
|
||||
#ifdef CONFIG_X86_64
|
||||
runtime_code_page_mkexec();
|
||||
#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;
|
||||
}
|
||||
Reference in New Issue
Block a user