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Message-Id: <1186990221.22431.38.camel@caritas-dev.intel.com>
Date: Mon, 13 Aug 2007 15:30:21 +0800
From: "Huang, Ying" <ying.huang@...el.com>
To: Andi Kleen <ak@...e.de>, akpm@...ux-foundation.org,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Chandramouli Narayanan <mouli@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] x86_64 EFI runtime service support: EFI basic runtime
service support
Changelog between v3 of EFI x86_64 support patch and this version:
1. Remove E820_RUNTIME_CODE, the EFI memory map is used to deal with
EFI runtime code area.
2. The method used to make EFI runtime code area executable is change:
a. Before page allocation is usable, the PMD of direct mapping is
changed temporarily before and after each EFI call.
b. After page allocation is usable, change_page_attr_addr is used
to change corresponding page attribute.
3. Use fixmap to map EFI memory mapped IO memory area to make kexec
workable.
4. Add a kernel command line option "noefi" to make it possible to
turn off EFI runtime services support.
Changelog between v2 and v3:
1. The EFI callwrapper is re-implemented in assembler.
---
This patch adds basic runtime services support for EFI x86_64
system. The main file of the patch is the addition of efi.c for
x86_64. This file is modeled after the EFI IA32 avatar. EFI runtime
services initialization are implemented in efi.c. Some x86_64
specifics are worth noting here. On x86_64, parameters passed to UEFI
firmware services need to follow the UEFI calling convention. For this
purpose, a set of functions named lin2win<x> (<x> is the number of
parameters) are implemented. EFI function calls are wrapped before
calling the firmware service.
Signed-off-by: Chandramouli Narayanan <mouli@...ux.intel.com>
Signed-off-by: Huang Ying <ying.huang@...el.com>
---
arch/x86_64/Kconfig | 13
arch/x86_64/kernel/Makefile | 1
arch/x86_64/kernel/efi.c | 581 ++++++++++++++++++++++++++++++++++++++
arch/x86_64/kernel/efi_callwrap.S | 69 ++++
arch/x86_64/kernel/setup.c | 15
include/asm-x86_64/bootsetup.h | 6
include/asm-x86_64/eficallwrap.h | 33 ++
include/asm-x86_64/efidef.h | 6
include/asm-x86_64/fixmap.h | 3
9 files changed, 726 insertions(+), 1 deletion(-)
Index: linux-2.6.23-rc2/include/asm-x86_64/eficallwrap.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.23-rc2/include/asm-x86_64/eficallwrap.h 2007-08-13 13:08:50.000000000 +0800
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2007 Intel Corp
+ * Bibo Mao <bibo.mao@...el.com>
+ * Huang Ying <ying.huang@...el.com>
+ *
+ * Function calling ABI conversion from SYSV to Windows for x86_64
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __ASM_X86_64_EFICALLWRAP_H
+#define __ASM_X86_64_EFICALLWRAP_H
+
+extern efi_status_t lin2win0(void *fp);
+extern efi_status_t lin2win1(void *fp, u64 arg1);
+extern efi_status_t lin2win2(void *fp, u64 arg1, u64 arg2);
+extern efi_status_t lin2win3(void *fp, u64 arg1, u64 arg2, u64 arg3);
+extern efi_status_t lin2win4(void *fp, u64 arg1, u64 arg2, u64 arg3, u64 arg4);
+extern efi_status_t lin2win5(void *fp, u64 arg1, u64 arg2, u64 arg3,
+ u64 arg4, u64 arg5);
+extern efi_status_t lin2win6(void *fp, u64 arg1, u64 arg2, u64 arg3,
+ u64 arg4, u64 arg5, u64 arg6);
+
+#endif
Index: linux-2.6.23-rc2/arch/x86_64/kernel/efi.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.23-rc2/arch/x86_64/kernel/efi.c 2007-08-13 13:08:50.000000000 +0800
@@ -0,0 +1,581 @@
+/*
+ * Extensible Firmware Interface
+ *
+ * Based on Extensible Firmware Interface Specification version 1.0
+ *
+ * Copyright (C) 1999 VA Linux Systems
+ * Copyright (C) 1999 Walt Drummond <drummond@...inux.com>
+ * Copyright (C) 1999-2002 Hewlett-Packard Co.
+ * David Mosberger-Tang <davidm@....hp.com>
+ * Stephane Eranian <eranian@....hp.com>
+ * Copyright (C) 2005-2008 Intel Co.
+ * Fenghua Yu <fenghua.yu@...el.com>
+ * Bibo Mao <bibo.mao@...el.com>
+ * Chandramouli Narayanan <mouli@...ux.intel.com>
+ *
+ * Code to convert EFI to E820 map has been implemented in elilo bootloader
+ * based on a EFI patch by Edgar Hucek. Based on the E820 map, the page table
+ * is setup appropriately for EFI runtime code.
+ * - mouli 06/14/2007.
+ *
+ * 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@...el.com>
+ * Skip non-WB memory and ignore empty memory ranges.
+ */
+
+#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/uaccess.h>
+#include <linux/io.h>
+#include <linux/reboot.h>
+
+#include <asm/setup.h>
+#include <asm/bootsetup.h>
+#include <asm/page.h>
+#include <asm/e820.h>
+#include <asm/pgtable.h>
+#include <asm/tlbflush.h>
+#include <asm/cacheflush.h>
+#include <asm/proto.h>
+#include <asm/eficallwrap.h>
+#include <asm/efidef.h>
+#include <asm/time.h>
+
+int efi_enabled;
+EXPORT_SYMBOL(efi_enabled);
+
+struct efi efi;
+EXPORT_SYMBOL(efi);
+
+struct efi_memory_map memmap;
+
+struct efi efi_phys __initdata;
+static efi_system_table_t efi_systab __initdata;
+static unsigned long efi_flags __initdata;
+/* efi_lock protects efi physical mode call */
+static spinlock_t efi_lock __initdata = SPIN_LOCK_UNLOCKED;
+static pgd_t save_pgd __initdata;
+static int noefi_time __initdata;
+
+static int __init setup_noefi(char *arg)
+{
+ efi_enabled = 0;
+ return 0;
+}
+early_param("noefi", setup_noefi);
+
+static int __init setup_noefi_time(char *arg)
+{
+ noefi_time = 1;
+ return 0;
+}
+early_param("noefi_time", setup_noefi_time);
+
+static efi_status_t _efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
+{
+ return lin2win2((void *)efi.systab->runtime->get_time,
+ (u64)tm, (u64)tc);
+}
+
+static efi_status_t _efi_set_time(efi_time_t *tm)
+{
+ return lin2win1((void *)efi.systab->runtime->set_time, (u64)tm);
+}
+
+static efi_status_t _efi_get_wakeup_time(efi_bool_t *enabled,
+ efi_bool_t *pending,
+ efi_time_t *tm)
+{
+ return lin2win3((void *)efi.systab->runtime->get_wakeup_time,
+ (u64)enabled, (u64)pending, (u64)tm);
+}
+
+static efi_status_t _efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
+{
+ return lin2win2((void *)efi.systab->runtime->set_wakeup_time,
+ (u64)enabled, (u64)tm);
+}
+
+static efi_status_t _efi_get_variable(efi_char16_t *name,
+ efi_guid_t *vendor,
+ u32 *attr,
+ unsigned long *data_size,
+ void *data)
+{
+ return lin2win5((void *)efi.systab->runtime->get_variable,
+ (u64)name, (u64)vendor, (u64)attr,
+ (u64)data_size, (u64)data);
+}
+
+static efi_status_t _efi_get_next_variable(unsigned long *name_size,
+ efi_char16_t *name,
+ efi_guid_t *vendor)
+{
+ return lin2win3((void *)efi.systab->runtime->get_next_variable,
+ (u64)name_size, (u64)name, (u64)vendor);
+}
+
+static efi_status_t _efi_set_variable(
+ efi_char16_t *name, efi_guid_t *vendor,
+ u64 attr, u64 data_size, void *data)
+{
+ return lin2win5((void *)efi.systab->runtime->set_variable,
+ (u64)name, (u64)vendor, (u64)attr,
+ (u64)data_size, (u64)data);
+}
+
+static efi_status_t _efi_get_next_high_mono_count(u32 *count)
+{
+ return lin2win1((void *)efi.systab->runtime->get_next_high_mono_count,
+ (u64)count);
+}
+
+static efi_status_t _efi_reset_system(int reset_type,
+ efi_status_t status,
+ unsigned long data_size,
+ efi_char16_t *data)
+{
+ return lin2win4((void *)efi.systab->runtime->reset_system,
+ (u64)reset_type, (u64)status,
+ (u64)data_size, (u64)data);
+}
+
+static efi_status_t _efi_set_virtual_address_map(
+ unsigned long memory_map_size,
+ unsigned long descriptor_size,
+ u32 descriptor_version,
+ efi_memory_desc_t *virtual_map)
+{
+ return lin2win4((void *)efi.systab->runtime->set_virtual_address_map,
+ (u64)memory_map_size, (u64)descriptor_size,
+ (u64)descriptor_version, (u64)virtual_map);
+}
+
+static void __init early_mapping_set_exec(unsigned long start,
+ unsigned long end,
+ int executable)
+{
+ pte_t *kpte;
+
+ while (start < end) {
+ kpte = lookup_address((unsigned long)__va(start));
+ BUG_ON(!kpte);
+ if (executable)
+ set_pte(kpte, pte_mkexec(*kpte));
+ else
+ set_pte(kpte, __pte((pte_val(*kpte) | _PAGE_NX) & \
+ __supported_pte_mask));
+ if (pte_huge(*kpte))
+ start = (start + PMD_SIZE) & PMD_MASK;
+ else
+ start = (start + PAGE_SIZE) & PAGE_MASK;
+ }
+}
+
+static void __init early_runtime_code_mapping_set_exec(int executable)
+{
+ efi_memory_desc_t *md;
+ void *p;
+
+ /* 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) {
+ unsigned long end;
+ end = md->phys_addr + (md->num_pages << PAGE_SHIFT);
+ early_mapping_set_exec(md->phys_addr, end, executable);
+ }
+ }
+}
+
+static void __init efi_call_phys_prelog(void) __acquires(efi_lock)
+{
+ unsigned long vaddress;
+
+ /*
+ * Lock sequence is different from normal case because
+ * efi_flags is global
+ */
+ spin_lock(&efi_lock);
+ local_irq_save(efi_flags);
+ early_runtime_code_mapping_set_exec(1);
+ vaddress = (unsigned long)__va(0x0UL);
+ pgd_val(save_pgd) = pgd_val(*pgd_offset_k(0x0UL));
+ set_pgd(pgd_offset_k(0x0UL), *pgd_offset_k(vaddress));
+ global_flush_tlb();
+}
+
+static void __init efi_call_phys_epilog(void) __releases(efi_lock)
+{
+ /*
+ * After the lock is released, the original page table is restored.
+ */
+ set_pgd(pgd_offset_k(0x0UL), save_pgd);
+ early_runtime_code_mapping_set_exec(0);
+ global_flush_tlb();
+ local_irq_restore(efi_flags);
+ spin_unlock(&efi_lock);
+}
+
+static efi_status_t __init phys_efi_set_virtual_address_map(
+ unsigned long memory_map_size,
+ unsigned long descriptor_size,
+ u32 descriptor_version,
+ efi_memory_desc_t *virtual_map)
+{
+ efi_status_t status;
+
+ efi_call_phys_prelog();
+ status = lin2win4((void *)efi_phys.set_virtual_address_map,
+ (u64)memory_map_size, (u64)descriptor_size,
+ (u64)descriptor_version, (u64)virtual_map);
+ efi_call_phys_epilog();
+ return status;
+}
+
+static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
+ efi_time_cap_t *tc)
+{
+ efi_status_t status;
+
+ efi_call_phys_prelog();
+ status = lin2win2((void *)efi_phys.get_time, (u64)tm, (u64)tc);
+ efi_call_phys_epilog();
+ return status;
+}
+
+/*
+ * To call this function, the irq must be disabled and rtc_lock in
+ * time.c must be held.
+ */
+int efi_set_rtc_mmss(unsigned long nowtime)
+{
+ int real_seconds, real_minutes;
+ efi_status_t status;
+ efi_time_t eft;
+ efi_time_cap_t cap;
+
+ status = efi.get_time(&eft, &cap);
+ if (status != EFI_SUCCESS) {
+ printk(KERN_ERR "Oops: efitime: can't read time!\n");
+ return -1;
+ }
+
+ real_seconds = nowtime % 60;
+ real_minutes = nowtime / 60;
+ if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
+ real_minutes += 30;
+ real_minutes %= 60;
+ eft.minute = real_minutes;
+ eft.second = real_seconds;
+
+ status = efi.set_time(&eft);
+ if (status != EFI_SUCCESS) {
+ printk(KERN_ERR "Oops: efitime: can't write time!\n");
+ return -1;
+ }
+ return 0;
+}
+
+/*
+ * To call this function, the irq must be disabled and rtc_lock in
+ * time.c must be held.
+ */
+unsigned long efi_get_time(void)
+{
+ efi_status_t status;
+ efi_time_t eft;
+ efi_time_cap_t cap;
+
+ status = efi.get_time(&eft, &cap);
+ if (status != EFI_SUCCESS)
+ printk(KERN_ERR "Oops: efitime: can't read time!\n");
+
+ return mktime(eft.year, eft.month, eft.day, eft.hour,
+ eft.minute, eft.second);
+}
+
+void __init efi_init(void)
+{
+ efi_config_table_t *config_tables;
+ efi_runtime_services_t *runtime;
+ efi_char16_t *c16;
+ char vendor[100] = "unknown";
+ int i = 0;
+
+ memset(&efi, 0, sizeof(efi));
+ memset(&efi_phys, 0, sizeof(efi_phys));
+
+ efi_phys.systab = (efi_system_table_t *)EFI_SYSTAB;
+ memmap.phys_map = (void *)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 = early_ioremap((unsigned long)efi_phys.systab,
+ sizeof(efi_system_table_t));
+ memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
+ efi.systab = &efi_systab;
+ /*
+ * Verify the EFI Table
+ */
+ if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
+ printk(KERN_ERR "Woah! EFI system table "
+ "signature incorrect\n");
+ if ((efi.systab->hdr.revision >> 16) == 0)
+ printk(KERN_ERR "Warning: EFI system table version "
+ "%d.%02d, expected 1.00 or greater\n",
+ efi.systab->hdr.revision >> 16,
+ efi.systab->hdr.revision & 0xffff);
+
+ /*
+ * Show what we know for posterity
+ */
+ c16 = early_ioremap(efi.systab->fw_vendor, 2);
+ if (!probe_kernel_address(c16, i)) {
+ for (i = 0; i < sizeof(vendor) && *c16; ++i)
+ vendor[i] = *c16++;
+ vendor[i] = '\0';
+ }
+
+ printk(KERN_INFO "EFI v%u.%.02u by %s \n",
+ efi.systab->hdr.revision >> 16,
+ efi.systab->hdr.revision & 0xffff, vendor);
+
+ /*
+ * Let's see what config tables the firmware passed to us.
+ */
+ config_tables = early_ioremap(
+ efi.systab->tables,
+ efi.systab->nr_tables * sizeof(efi_config_table_t));
+ if (config_tables == NULL)
+ printk(KERN_ERR "Could not map EFI Configuration Table!\n");
+
+ printk(KERN_INFO);
+ for (i = 0; i < efi.systab->nr_tables; i++) {
+ if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
+ efi.mps = config_tables[i].table;
+ printk(" MPS=0x%lx ", config_tables[i].table);
+ } else if (!efi_guidcmp(config_tables[i].guid,
+ ACPI_20_TABLE_GUID)) {
+ efi.acpi20 = config_tables[i].table;
+ printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
+ } else if (!efi_guidcmp(config_tables[i].guid,
+ ACPI_TABLE_GUID)) {
+ efi.acpi = config_tables[i].table;
+ printk(" ACPI=0x%lx ", config_tables[i].table);
+ } else if (!efi_guidcmp(config_tables[i].guid,
+ SMBIOS_TABLE_GUID)) {
+ efi.smbios = config_tables[i].table;
+ printk(" SMBIOS=0x%lx ", config_tables[i].table);
+ } else if (!efi_guidcmp(config_tables[i].guid,
+ HCDP_TABLE_GUID)) {
+ efi.hcdp = config_tables[i].table;
+ printk(" HCDP=0x%lx ", config_tables[i].table);
+ } else if (!efi_guidcmp(config_tables[i].guid,
+ UGA_IO_PROTOCOL_GUID)) {
+ efi.uga = config_tables[i].table;
+ printk(" UGA=0x%lx ", config_tables[i].table);
+ }
+ }
+ printk("\n");
+
+ /*
+ * Check out the runtime services table. We need to map
+ * the runtime services table so that we can grab the physical
+ * address of several of the EFI runtime functions, needed to
+ * set the firmware into virtual mode.
+ */
+ runtime = early_ioremap((unsigned long)efi.systab->runtime,
+ sizeof(efi_runtime_services_t));
+ if (runtime != NULL) {
+ /*
+ * We will only need *early* access to the following
+ * two EFI runtime services before set_virtual_address_map
+ * is invoked.
+ */
+ efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
+ efi_phys.set_virtual_address_map =
+ (efi_set_virtual_address_map_t *)runtime->set_virtual_address_map;
+ /*
+ * Make efi_get_time can be called before entering
+ * virtual mode.
+ */
+ efi.get_time = phys_efi_get_time;
+ } else
+ printk(KERN_ERR "Could not map the EFI runtime service "
+ "table!\n");
+
+ /* Map the EFI memory map */
+ memmap.map = __va((unsigned long)memmap.phys_map);
+ memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
+ if (EFI_MEMDESC_SIZE != sizeof(efi_memory_desc_t))
+ printk(KERN_WARNING "Kernel-defined memdesc"
+ "doesn't match the one from EFI!\n");
+
+ /* Setup for EFI runtime service */
+ reboot_type = BOOT_EFI;
+
+ if (!noefi_time) {
+ get_wallclock = efi_get_time;
+ set_wallclock = efi_set_rtc_mmss;
+ }
+}
+
+static void __init runtime_code_page_mkexec(void)
+{
+ efi_memory_desc_t *md;
+ void *p;
+
+ /* 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)
+ change_page_attr_addr(md->virt_addr,
+ md->num_pages,
+ PAGE_KERNEL_EXEC);
+ }
+ global_flush_tlb();
+}
+
+static void __iomem * __init efi_ioremap(unsigned long offset,
+ unsigned long size)
+{
+ static unsigned pages_mapped;
+ unsigned long last_addr;
+ unsigned i, pages;
+
+ last_addr = offset + size - 1;
+ offset &= PAGE_MASK;
+ pages = (PAGE_ALIGN(last_addr) - offset) >> PAGE_SHIFT;
+ if (pages_mapped + pages > MAX_EFI_IO_PAGES)
+ return NULL;
+
+ for (i = 0; i < pages; i++) {
+ set_fixmap_nocache(FIX_EFI_IO_MAP_FIRST_PAGE - pages_mapped,
+ offset);
+ offset += PAGE_SIZE;
+ pages_mapped++;
+ }
+
+ return (void __iomem *)__fix_to_virt(FIX_EFI_IO_MAP_FIRST_PAGE - \
+ (pages_mapped - pages));
+}
+
+/*
+ * 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 end;
+ 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;
+ if (md->attribute & EFI_MEMORY_WB)
+ md->virt_addr = (unsigned long)__va(md->phys_addr);
+ else if (md->attribute & (EFI_MEMORY_UC | EFI_MEMORY_WC))
+ md->virt_addr = (unsigned long)
+ efi_ioremap(md->phys_addr,
+ md->num_pages << EFI_PAGE_SHIFT);
+ end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
+ if ((md->phys_addr <= (unsigned long)efi_phys.systab) &&
+ ((unsigned long)efi_phys.systab < end))
+ efi.systab = (efi_system_table_t *)
+ (md->virt_addr - md->phys_addr +
+ (unsigned long)efi_phys.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 "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.
+ *
+ * Call EFI services through wrapper functions.
+ */
+ efi.get_time = (efi_get_time_t *)_efi_get_time;
+ efi.set_time = (efi_set_time_t *)_efi_set_time;
+ efi.get_wakeup_time = (efi_get_wakeup_time_t *)_efi_get_wakeup_time;
+ efi.set_wakeup_time = (efi_set_wakeup_time_t *)_efi_set_wakeup_time;
+ efi.get_variable = (efi_get_variable_t *)_efi_get_variable;
+ efi.get_next_variable = (efi_get_next_variable_t *)
+ _efi_get_next_variable;
+ efi.set_variable = (efi_set_variable_t *)_efi_set_variable;
+ efi.get_next_high_mono_count = (efi_get_next_high_mono_count_t *)
+ _efi_get_next_high_mono_count;
+ efi.reset_system = (efi_reset_system_t *)_efi_reset_system;
+ efi.set_virtual_address_map = (efi_set_virtual_address_map_t *)
+ _efi_set_virtual_address_map;
+
+ runtime_code_page_mkexec();
+}
+
+/*
+ * 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;
+}
Index: linux-2.6.23-rc2/arch/x86_64/kernel/efi_callwrap.S
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.23-rc2/arch/x86_64/kernel/efi_callwrap.S 2007-08-13 13:08:50.000000000 +0800
@@ -0,0 +1,69 @@
+/*
+ * linux/arch/x86_64/kernel/efi_callwrap.S -- Function calling ABI
+ * conversion from SYSV to Windows for x86_64
+ *
+ * Copyright (C) 2007 Intel Corp
+ * Bibo Mao <bibo.mao@...el.com>
+ * Huang Ying <ying.huang@...el.com>
+ */
+
+#include <linux/linkage.h>
+
+ENTRY(lin2win0)
+ subq $40, %rsp
+ call *%rdi
+ addq $40, %rsp
+ ret
+
+ENTRY(lin2win1)
+ subq $40, %rsp
+ mov %rsi, %rcx
+ call *%rdi
+ addq $40, %rsp
+ ret
+
+ENTRY(lin2win2)
+ subq $40, %rsp
+ mov %rsi, %rcx
+ call *%rdi
+ addq $40, %rsp
+ ret
+
+ENTRY(lin2win3)
+ subq $40, %rsp
+ mov %rcx, %r8
+ mov %rsi, %rcx
+ call *%rdi
+ addq $40, %rsp
+ ret
+
+ENTRY(lin2win4)
+ subq $40, %rsp
+ mov %r8, %r9
+ mov %rcx, %r8
+ mov %rsi, %rcx
+ call *%rdi
+ addq $40, %rsp
+ ret
+
+ENTRY(lin2win5)
+ subq $40, %rsp
+ mov %r9, 32(%rsp)
+ mov %r8, %r9
+ mov %rcx, %r8
+ mov %rsi, %rcx
+ call *%rdi
+ addq $40, %rsp
+ ret
+
+ENTRY(lin2win6)
+ subq $56, %rsp
+ mov 56+8(%rsp), %rax
+ mov %r9, 32(%rsp)
+ mov %rax, 40(%rsp)
+ mov %r8, %r9
+ mov %rcx, %r8
+ mov %rsi, %rcx
+ call *%rdi
+ addq $56, %rsp
+ ret
Index: linux-2.6.23-rc2/include/asm-x86_64/bootsetup.h
===================================================================
--- linux-2.6.23-rc2.orig/include/asm-x86_64/bootsetup.h 2007-08-13 13:08:41.000000000 +0800
+++ linux-2.6.23-rc2/include/asm-x86_64/bootsetup.h 2007-08-13 13:08:50.000000000 +0800
@@ -17,6 +17,12 @@
#define APM_BIOS_INFO (*(struct apm_bios_info *) (PARAM+0x40))
#define DRIVE_INFO (*(struct drive_info_struct *) (PARAM+0x80))
#define SYS_DESC_TABLE (*(struct sys_desc_table_struct*)(PARAM+0xa0))
+#define EFI_LOADER_SIG ((unsigned char *)(PARAM+0x1c0))
+#define EFI_MEMDESC_SIZE (*((unsigned int *) (PARAM+0x1c4)))
+#define EFI_MEMDESC_VERSION (*((unsigned int *) (PARAM+0x1c8)))
+#define EFI_MEMMAP_SIZE (*((unsigned int *) (PARAM+0x1cc)))
+#define EFI_MEMMAP (*((unsigned long *)(PARAM+0x1d0)))
+#define EFI_SYSTAB (*((unsigned long *)(PARAM+0x1d8)))
#define MOUNT_ROOT_RDONLY (*(unsigned short *) (PARAM+0x1F2))
#define RAMDISK_FLAGS (*(unsigned short *) (PARAM+0x1F8))
#define SAVED_VIDEO_MODE (*(unsigned short *) (PARAM+0x1FA))
Index: linux-2.6.23-rc2/arch/x86_64/kernel/setup.c
===================================================================
--- linux-2.6.23-rc2.orig/arch/x86_64/kernel/setup.c 2007-08-13 13:08:41.000000000 +0800
+++ linux-2.6.23-rc2/arch/x86_64/kernel/setup.c 2007-08-13 13:08:50.000000000 +0800
@@ -44,6 +44,7 @@
#include <linux/dmi.h>
#include <linux/dma-mapping.h>
#include <linux/ctype.h>
+#include <linux/efi.h>
#include <asm/mtrr.h>
#include <asm/uaccess.h>
@@ -236,6 +237,10 @@
rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
#endif
+#ifdef CONFIG_EFI
+ if (!strncmp(EFI_LOADER_SIG, "EFIL", 4))
+ efi_enabled = 1;
+#endif
setup_memory_region();
copy_edd();
@@ -273,6 +278,8 @@
discover_ebda();
init_memory_mapping(0, (end_pfn_map << PAGE_SHIFT));
+ if (efi_enabled)
+ efi_init();
dmi_scan_machine();
@@ -339,6 +346,11 @@
*/
acpi_reserve_bootmem();
#endif
+
+ /* Reserve efi memory map */
+ if (efi_enabled)
+ reserve_bootmem_generic(EFI_MEMMAP, EFI_MEMMAP_SIZE);
+
/*
* Find and reserve possible boot-time SMP configuration:
*/
@@ -411,7 +423,8 @@
#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
- conswitchp = &vga_con;
+ if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
+ conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
conswitchp = &dummy_con;
#endif
Index: linux-2.6.23-rc2/include/asm-x86_64/fixmap.h
===================================================================
--- linux-2.6.23-rc2.orig/include/asm-x86_64/fixmap.h 2007-08-13 13:08:41.000000000 +0800
+++ linux-2.6.23-rc2/include/asm-x86_64/fixmap.h 2007-08-13 13:08:50.000000000 +0800
@@ -15,6 +15,7 @@
#include <asm/apicdef.h>
#include <asm/page.h>
#include <asm/vsyscall.h>
+#include <asm/efidef.h>
/*
* Here we define all the compile-time 'special' virtual
@@ -41,6 +42,8 @@
FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
FIX_IO_APIC_BASE_0,
FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1,
+ FIX_EFI_IO_MAP_LAST_PAGE,
+ FIX_EFI_IO_MAP_FIRST_PAGE = FIX_EFI_IO_MAP_LAST_PAGE+MAX_EFI_IO_PAGES-1,
__end_of_fixed_addresses
};
Index: linux-2.6.23-rc2/include/asm-x86_64/efidef.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.23-rc2/include/asm-x86_64/efidef.h 2007-08-13 13:08:50.000000000 +0800
@@ -0,0 +1,6 @@
+#ifndef __ASM_X86_64_EFIDEF_H
+#define __ASM_X86_64_EFIDEF_H
+
+#define MAX_EFI_IO_PAGES 100
+
+#endif
Index: linux-2.6.23-rc2/arch/x86_64/Kconfig
===================================================================
--- linux-2.6.23-rc2.orig/arch/x86_64/Kconfig 2007-08-13 13:08:41.000000000 +0800
+++ linux-2.6.23-rc2/arch/x86_64/Kconfig 2007-08-13 13:08:50.000000000 +0800
@@ -266,6 +266,19 @@
depends on SMP && !MK8
default y
+config EFI
+ bool "Boot from EFI support (EXPERIMENTAL)"
+ ---help---
+ This enables the the kernel to boot on EFI platforms using
+ system configuration information passed to it from the firmware.
+ This also enables the kernel to use any EFI runtime services that are
+ available (such as the EFI variable services).
+ This option is only useful on systems that have EFI firmware
+ and will result in a kernel image that is ~8k larger. However,
+ even with this option, the resultant kernel should continue to
+ boot on existing non-EFI platforms. For more information on
+ how to set up [U]EFI64 system, see Documentation/x86_64/uefi.txt.
+
config MATH_EMULATION
bool
Index: linux-2.6.23-rc2/arch/x86_64/kernel/Makefile
===================================================================
--- linux-2.6.23-rc2.orig/arch/x86_64/kernel/Makefile 2007-08-13 13:08:41.000000000 +0800
+++ linux-2.6.23-rc2/arch/x86_64/kernel/Makefile 2007-08-13 13:08:50.000000000 +0800
@@ -37,6 +37,7 @@
obj-$(CONFIG_X86_VSMP) += vsmp.o
obj-$(CONFIG_K8_NB) += k8.o
obj-$(CONFIG_AUDIT) += audit.o
+obj-$(CONFIG_EFI) += efi.o efi_callwrap.o
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_PCI) += early-quirks.o
-
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