613 lines
16 KiB
C
613 lines
16 KiB
C
/*
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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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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <asm/x86_init.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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static struct efi efi_phys __initdata;
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static efi_system_table_t efi_systab __initdata;
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static int __init setup_noefi(char *arg)
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{
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efi_enabled = 0;
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return 0;
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}
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early_param("noefi", setup_noefi);
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int add_efi_memmap;
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EXPORT_SYMBOL(add_efi_memmap);
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static int __init setup_add_efi_memmap(char *arg)
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{
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add_efi_memmap = 1;
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return 0;
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}
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early_param("add_efi_memmap", setup_add_efi_memmap);
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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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/*
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* Tell the kernel about the EFI memory map. This might include
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* more than the max 128 entries that can fit in the e820 legacy
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* (zeropage) memory map.
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*/
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static void __init do_add_efi_memmap(void)
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{
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void *p;
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for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
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efi_memory_desc_t *md = p;
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unsigned long long start = md->phys_addr;
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unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
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int e820_type;
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switch (md->type) {
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case EFI_LOADER_CODE:
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case EFI_LOADER_DATA:
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case EFI_BOOT_SERVICES_CODE:
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case EFI_BOOT_SERVICES_DATA:
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case EFI_CONVENTIONAL_MEMORY:
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if (md->attribute & EFI_MEMORY_WB)
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e820_type = E820_RAM;
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else
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e820_type = E820_RESERVED;
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break;
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case EFI_ACPI_RECLAIM_MEMORY:
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e820_type = E820_ACPI;
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break;
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case EFI_ACPI_MEMORY_NVS:
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e820_type = E820_NVS;
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break;
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case EFI_UNUSABLE_MEMORY:
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e820_type = E820_UNUSABLE;
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break;
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default:
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/*
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* EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
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* EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
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* EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
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*/
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e820_type = E820_RESERVED;
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break;
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}
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e820_add_region(start, size, e820_type);
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}
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sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
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}
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void __init efi_reserve_early(void)
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{
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unsigned long pmap;
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#ifdef CONFIG_X86_32
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pmap = boot_params.efi_info.efi_memmap;
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#else
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pmap = (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.phys_map = (void *)pmap;
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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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reserve_early(pmap, pmap + memmap.nr_map * memmap.desc_size,
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"EFI memmap");
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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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#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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#endif
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efi.systab = 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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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 = early_ioremap(efi.systab->fw_vendor, 2);
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if (c16) {
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for (i = 0; i < sizeof(vendor) - 1 && *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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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 = 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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#ifdef CONFIG_X86_UV
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} else if (!efi_guidcmp(config_tables[i].guid,
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UV_SYSTEM_TABLE_GUID)) {
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efi.uv_systab = config_tables[i].table;
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printk(" UVsystab=0x%lx ", config_tables[i].table);
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#endif
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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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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 = 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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early_iounmap(runtime, sizeof(efi_runtime_services_t));
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/* Map the EFI memory map */
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memmap.map = 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
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"Kernel-defined memdesc doesn't match the one from EFI!\n");
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if (add_efi_memmap)
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do_add_efi_memmap();
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#ifdef CONFIG_X86_32
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x86_platform.get_wallclock = efi_get_time;
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x86_platform.set_wallclock = efi_set_rtc_mmss;
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#endif
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/* Setup for EFI runtime service */
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reboot_type = BOOT_EFI;
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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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static void __init runtime_code_page_mkexec(void)
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{
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efi_memory_desc_t *md;
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void *p;
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u64 addr, npages;
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|
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/* 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, end_pfn;
|
|
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;
|
|
|
|
end_pfn = PFN_UP(end);
|
|
if (end_pfn <= max_low_pfn_mapped
|
|
|| (end_pfn > (1UL << (32 - PAGE_SHIFT))
|
|
&& end_pfn <= max_pfn_mapped))
|
|
va = __va(md->phys_addr);
|
|
else
|
|
va = efi_ioremap(md->phys_addr, size, md->type);
|
|
|
|
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;
|
|
}
|