Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
635
arch/i386/kernel/efi.c
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635
arch/i386/kernel/efi.c
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@@ -0,0 +1,635 @@
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/*
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* Extensible Firmware Interface
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*
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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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*
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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/config.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/types.h>
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#include <linux/time.h>
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#include <linux/spinlock.h>
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#include <linux/bootmem.h>
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#include <linux/ioport.h>
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#include <linux/module.h>
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#include <linux/efi.h>
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#include <asm/setup.h>
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#include <asm/io.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/processor.h>
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#include <asm/desc.h>
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#include <asm/tlbflush.h>
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#define EFI_DEBUG 0
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#define PFX "EFI: "
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extern efi_status_t asmlinkage efi_call_phys(void *, ...);
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struct efi efi;
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EXPORT_SYMBOL(efi);
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static struct efi efi_phys __initdata;
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struct efi_memory_map memmap __initdata;
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/*
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* We require an early boot_ioremap mapping mechanism initially
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*/
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extern void * boot_ioremap(unsigned long, unsigned long);
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/*
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* To make EFI call EFI runtime service in physical addressing mode we need
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* prelog/epilog before/after the invocation to disable interrupt, to
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* claim EFI runtime service handler exclusively and to duplicate a memory in
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* low memory space say 0 - 3G.
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*/
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static unsigned long efi_rt_eflags;
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static DEFINE_SPINLOCK(efi_rt_lock);
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static pgd_t efi_bak_pg_dir_pointer[2];
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static void efi_call_phys_prelog(void)
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{
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unsigned long cr4;
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unsigned long temp;
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spin_lock(&efi_rt_lock);
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local_irq_save(efi_rt_eflags);
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/*
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* If I don't have PSE, I should just duplicate two entries in page
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* directory. If I have PSE, I just need to duplicate one entry in
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* page directory.
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*/
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__asm__ __volatile__("movl %%cr4, %0":"=r"(cr4));
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if (cr4 & X86_CR4_PSE) {
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efi_bak_pg_dir_pointer[0].pgd =
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swapper_pg_dir[pgd_index(0)].pgd;
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swapper_pg_dir[0].pgd =
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swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd;
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} else {
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efi_bak_pg_dir_pointer[0].pgd =
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swapper_pg_dir[pgd_index(0)].pgd;
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efi_bak_pg_dir_pointer[1].pgd =
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swapper_pg_dir[pgd_index(0x400000)].pgd;
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swapper_pg_dir[pgd_index(0)].pgd =
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swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd;
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temp = PAGE_OFFSET + 0x400000;
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swapper_pg_dir[pgd_index(0x400000)].pgd =
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swapper_pg_dir[pgd_index(temp)].pgd;
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}
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/*
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* After the lock is released, the original page table is restored.
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*/
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local_flush_tlb();
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cpu_gdt_descr[0].address = __pa(cpu_gdt_descr[0].address);
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__asm__ __volatile__("lgdt %0":"=m"
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(*(struct Xgt_desc_struct *) __pa(&cpu_gdt_descr[0])));
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}
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static void efi_call_phys_epilog(void)
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{
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unsigned long cr4;
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cpu_gdt_descr[0].address =
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(unsigned long) __va(cpu_gdt_descr[0].address);
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__asm__ __volatile__("lgdt %0":"=m"(cpu_gdt_descr));
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__asm__ __volatile__("movl %%cr4, %0":"=r"(cr4));
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if (cr4 & X86_CR4_PSE) {
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swapper_pg_dir[pgd_index(0)].pgd =
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efi_bak_pg_dir_pointer[0].pgd;
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} else {
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swapper_pg_dir[pgd_index(0)].pgd =
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efi_bak_pg_dir_pointer[0].pgd;
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swapper_pg_dir[pgd_index(0x400000)].pgd =
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efi_bak_pg_dir_pointer[1].pgd;
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}
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/*
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* After the lock is released, the original page table is restored.
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*/
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local_flush_tlb();
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local_irq_restore(efi_rt_eflags);
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spin_unlock(&efi_rt_lock);
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}
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static efi_status_t
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phys_efi_set_virtual_address_map(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_phys(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
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phys_efi_get_time(efi_time_t *tm, 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_phys(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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inline 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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spin_lock(&efi_rt_lock);
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status = efi.get_time(&eft, &cap);
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spin_unlock(&efi_rt_lock);
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if (status != EFI_SUCCESS)
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panic("Ooops, efitime: can't read time!\n");
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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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if (status != EFI_SUCCESS) {
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printk("Ooops: efitime: can't read 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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/*
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* This should only be used during kernel init and before runtime
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* services have been remapped, therefore, we'll need to call in physical
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* mode. Note, this call isn't used later, so mark it __init.
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*/
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inline unsigned long __init 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 = phys_efi_get_time(&eft, &cap);
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if (status != EFI_SUCCESS)
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printk("Oops: efitime: can't read time status: 0x%lx\n",status);
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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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int is_available_memory(efi_memory_desc_t * md)
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{
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if (!(md->attribute & EFI_MEMORY_WB))
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return 0;
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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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return 1;
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}
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return 0;
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}
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/*
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* We need to map the EFI memory map again after paging_init().
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*/
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void __init efi_map_memmap(void)
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{
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memmap.map = NULL;
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memmap.map = (efi_memory_desc_t *)
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bt_ioremap((unsigned long) memmap.phys_map,
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(memmap.nr_map * sizeof(efi_memory_desc_t)));
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if (memmap.map == NULL)
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printk(KERN_ERR PFX "Could not remap the EFI memmap!\n");
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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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int i;
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for (i = 0; i < memmap.nr_map; i++) {
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md = &memmap.map[i];
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printk(KERN_INFO "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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/*
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* Walks the EFI memory map and calls CALLBACK once for each EFI
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* memory descriptor that has memory that is available for kernel use.
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*/
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void efi_memmap_walk(efi_freemem_callback_t callback, void *arg)
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{
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int prev_valid = 0;
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struct range {
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unsigned long start;
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unsigned long end;
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} prev, curr;
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efi_memory_desc_t *md;
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unsigned long start, end;
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int i;
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for (i = 0; i < memmap.nr_map; i++) {
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md = &memmap.map[i];
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if ((md->num_pages == 0) || (!is_available_memory(md)))
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continue;
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curr.start = md->phys_addr;
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curr.end = curr.start + (md->num_pages << EFI_PAGE_SHIFT);
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if (!prev_valid) {
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prev = curr;
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prev_valid = 1;
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} else {
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if (curr.start < prev.start)
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printk(KERN_INFO PFX "Unordered memory map\n");
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if (prev.end == curr.start)
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prev.end = curr.end;
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else {
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start =
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(unsigned long) (PAGE_ALIGN(prev.start));
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end = (unsigned long) (prev.end & PAGE_MASK);
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if ((end > start)
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&& (*callback) (start, end, arg) < 0)
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return;
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prev = curr;
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}
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}
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}
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if (prev_valid) {
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start = (unsigned long) PAGE_ALIGN(prev.start);
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end = (unsigned long) (prev.end & PAGE_MASK);
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if (end > start)
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(*callback) (start, end, arg);
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}
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}
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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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unsigned long num_config_tables;
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int i = 0;
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memset(&efi, 0, sizeof(efi) );
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memset(&efi_phys, 0, sizeof(efi_phys));
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efi_phys.systab = EFI_SYSTAB;
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memmap.phys_map = EFI_MEMMAP;
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memmap.nr_map = EFI_MEMMAP_SIZE/EFI_MEMDESC_SIZE;
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memmap.desc_version = EFI_MEMDESC_VERSION;
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efi.systab = (efi_system_table_t *)
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boot_ioremap((unsigned long) efi_phys.systab,
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sizeof(efi_system_table_t));
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/*
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* Verify the EFI Table
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*/
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if (efi.systab == NULL)
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printk(KERN_ERR PFX "Woah! Couldn't map the EFI system table.\n");
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if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
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printk(KERN_ERR PFX "Woah! EFI system table signature incorrect\n");
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if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
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printk(KERN_ERR PFX
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"Warning: EFI system table major version mismatch: "
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"got %d.%02d, expected %d.%02d\n",
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efi.systab->hdr.revision >> 16,
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efi.systab->hdr.revision & 0xffff,
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EFI_SYSTEM_TABLE_REVISION >> 16,
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EFI_SYSTEM_TABLE_REVISION & 0xffff);
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/*
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* Grab some details from the system table
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*/
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num_config_tables = efi.systab->nr_tables;
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config_tables = (efi_config_table_t *)efi.systab->tables;
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runtime = efi.systab->runtime;
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/*
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* Show what we know for posterity
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*/
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c16 = (efi_char16_t *) boot_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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printk(KERN_INFO PFX "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_config_table_t *)
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boot_ioremap((unsigned long) config_tables,
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num_config_tables * sizeof(efi_config_table_t));
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if (config_tables == NULL)
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printk(KERN_ERR PFX "Could not map EFI Configuration Table!\n");
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for (i = 0; i < num_config_tables; i++) {
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if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
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efi.mps = (void *)config_tables[i].table;
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printk(KERN_INFO " MPS=0x%lx ", config_tables[i].table);
|
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} else
|
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if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
|
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efi.acpi20 = __va(config_tables[i].table);
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printk(KERN_INFO " ACPI 2.0=0x%lx ", config_tables[i].table);
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} else
|
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if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
|
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efi.acpi = __va(config_tables[i].table);
|
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printk(KERN_INFO " ACPI=0x%lx ", config_tables[i].table);
|
||||
} else
|
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if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
|
||||
efi.smbios = (void *) config_tables[i].table;
|
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printk(KERN_INFO " SMBIOS=0x%lx ", config_tables[i].table);
|
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} else
|
||||
if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
|
||||
efi.hcdp = (void *)config_tables[i].table;
|
||||
printk(KERN_INFO " HCDP=0x%lx ", config_tables[i].table);
|
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} else
|
||||
if (efi_guidcmp(config_tables[i].guid, UGA_IO_PROTOCOL_GUID) == 0) {
|
||||
efi.uga = (void *)config_tables[i].table;
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||||
printk(KERN_INFO " UGA=0x%lx ", config_tables[i].table);
|
||||
}
|
||||
}
|
||||
printk("\n");
|
||||
|
||||
/*
|
||||
* Check out the runtime services table. We need to map
|
||||
* the runtime services table so that we can grab the physical
|
||||
* address of several of the EFI runtime functions, needed to
|
||||
* set the firmware into virtual mode.
|
||||
*/
|
||||
|
||||
runtime = (efi_runtime_services_t *) boot_ioremap((unsigned long)
|
||||
runtime,
|
||||
sizeof(efi_runtime_services_t));
|
||||
if (runtime != NULL) {
|
||||
/*
|
||||
* We will only need *early* access to the following
|
||||
* two EFI runtime services before set_virtual_address_map
|
||||
* is invoked.
|
||||
*/
|
||||
efi_phys.get_time = (efi_get_time_t *) runtime->get_time;
|
||||
efi_phys.set_virtual_address_map =
|
||||
(efi_set_virtual_address_map_t *)
|
||||
runtime->set_virtual_address_map;
|
||||
} else
|
||||
printk(KERN_ERR PFX "Could not map the runtime service table!\n");
|
||||
|
||||
/* Map the EFI memory map for use until paging_init() */
|
||||
|
||||
memmap.map = (efi_memory_desc_t *)
|
||||
boot_ioremap((unsigned long) EFI_MEMMAP, EFI_MEMMAP_SIZE);
|
||||
|
||||
if (memmap.map == NULL)
|
||||
printk(KERN_ERR PFX "Could not map the EFI memory map!\n");
|
||||
|
||||
if (EFI_MEMDESC_SIZE != sizeof(efi_memory_desc_t)) {
|
||||
printk(KERN_WARNING PFX "Warning! Kernel-defined memdesc doesn't "
|
||||
"match the one from EFI!\n");
|
||||
}
|
||||
#if EFI_DEBUG
|
||||
print_efi_memmap();
|
||||
#endif
|
||||
}
|
||||
|
||||
/*
|
||||
* 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;
|
||||
int i;
|
||||
|
||||
efi.systab = NULL;
|
||||
|
||||
for (i = 0; i < memmap.nr_map; i++) {
|
||||
md = &memmap.map[i];
|
||||
|
||||
if (md->attribute & EFI_MEMORY_RUNTIME) {
|
||||
md->virt_addr =
|
||||
(unsigned long)ioremap(md->phys_addr,
|
||||
md->num_pages << EFI_PAGE_SHIFT);
|
||||
if (!(unsigned long)md->virt_addr) {
|
||||
printk(KERN_ERR PFX "ioremap of 0x%lX failed\n",
|
||||
(unsigned long)md->phys_addr);
|
||||
}
|
||||
|
||||
if (((unsigned long)md->phys_addr <=
|
||||
(unsigned long)efi_phys.systab) &&
|
||||
((unsigned long)efi_phys.systab <
|
||||
md->phys_addr +
|
||||
((unsigned long)md->num_pages <<
|
||||
EFI_PAGE_SHIFT))) {
|
||||
unsigned long addr;
|
||||
|
||||
addr = md->virt_addr - md->phys_addr +
|
||||
(unsigned long)efi_phys.systab;
|
||||
efi.systab = (efi_system_table_t *)addr;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (!efi.systab)
|
||||
BUG();
|
||||
|
||||
status = phys_efi_set_virtual_address_map(
|
||||
sizeof(efi_memory_desc_t) * memmap.nr_map,
|
||||
sizeof(efi_memory_desc_t),
|
||||
memmap.desc_version,
|
||||
memmap.phys_map);
|
||||
|
||||
if (status != EFI_SUCCESS) {
|
||||
printk (KERN_ALERT "You are screwed! "
|
||||
"Unable to switch EFI into virtual mode "
|
||||
"(status=%lx)\n", status);
|
||||
panic("EFI call to SetVirtualAddressMap() failed!");
|
||||
}
|
||||
|
||||
/*
|
||||
* Now that EFI is in virtual mode, update the function
|
||||
* pointers in the runtime service table to the new virtual addresses.
|
||||
*/
|
||||
|
||||
efi.get_time = (efi_get_time_t *) efi.systab->runtime->get_time;
|
||||
efi.set_time = (efi_set_time_t *) efi.systab->runtime->set_time;
|
||||
efi.get_wakeup_time = (efi_get_wakeup_time_t *)
|
||||
efi.systab->runtime->get_wakeup_time;
|
||||
efi.set_wakeup_time = (efi_set_wakeup_time_t *)
|
||||
efi.systab->runtime->set_wakeup_time;
|
||||
efi.get_variable = (efi_get_variable_t *)
|
||||
efi.systab->runtime->get_variable;
|
||||
efi.get_next_variable = (efi_get_next_variable_t *)
|
||||
efi.systab->runtime->get_next_variable;
|
||||
efi.set_variable = (efi_set_variable_t *)
|
||||
efi.systab->runtime->set_variable;
|
||||
efi.get_next_high_mono_count = (efi_get_next_high_mono_count_t *)
|
||||
efi.systab->runtime->get_next_high_mono_count;
|
||||
efi.reset_system = (efi_reset_system_t *)
|
||||
efi.systab->runtime->reset_system;
|
||||
}
|
||||
|
||||
void __init
|
||||
efi_initialize_iomem_resources(struct resource *code_resource,
|
||||
struct resource *data_resource)
|
||||
{
|
||||
struct resource *res;
|
||||
efi_memory_desc_t *md;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < memmap.nr_map; i++) {
|
||||
md = &memmap.map[i];
|
||||
|
||||
if ((md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT)) >
|
||||
0x100000000ULL)
|
||||
continue;
|
||||
res = alloc_bootmem_low(sizeof(struct resource));
|
||||
switch (md->type) {
|
||||
case EFI_RESERVED_TYPE:
|
||||
res->name = "Reserved Memory";
|
||||
break;
|
||||
case EFI_LOADER_CODE:
|
||||
res->name = "Loader Code";
|
||||
break;
|
||||
case EFI_LOADER_DATA:
|
||||
res->name = "Loader Data";
|
||||
break;
|
||||
case EFI_BOOT_SERVICES_DATA:
|
||||
res->name = "BootServices Data";
|
||||
break;
|
||||
case EFI_BOOT_SERVICES_CODE:
|
||||
res->name = "BootServices Code";
|
||||
break;
|
||||
case EFI_RUNTIME_SERVICES_CODE:
|
||||
res->name = "Runtime Service Code";
|
||||
break;
|
||||
case EFI_RUNTIME_SERVICES_DATA:
|
||||
res->name = "Runtime Service Data";
|
||||
break;
|
||||
case EFI_CONVENTIONAL_MEMORY:
|
||||
res->name = "Conventional Memory";
|
||||
break;
|
||||
case EFI_UNUSABLE_MEMORY:
|
||||
res->name = "Unusable Memory";
|
||||
break;
|
||||
case EFI_ACPI_RECLAIM_MEMORY:
|
||||
res->name = "ACPI Reclaim";
|
||||
break;
|
||||
case EFI_ACPI_MEMORY_NVS:
|
||||
res->name = "ACPI NVS";
|
||||
break;
|
||||
case EFI_MEMORY_MAPPED_IO:
|
||||
res->name = "Memory Mapped IO";
|
||||
break;
|
||||
case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
|
||||
res->name = "Memory Mapped IO Port Space";
|
||||
break;
|
||||
default:
|
||||
res->name = "Reserved";
|
||||
break;
|
||||
}
|
||||
res->start = md->phys_addr;
|
||||
res->end = res->start + ((md->num_pages << EFI_PAGE_SHIFT) - 1);
|
||||
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
|
||||
if (request_resource(&iomem_resource, res) < 0)
|
||||
printk(KERN_ERR PFX "Failed to allocate res %s : 0x%lx-0x%lx\n",
|
||||
res->name, res->start, res->end);
|
||||
/*
|
||||
* We don't know which region contains kernel data so we try
|
||||
* it repeatedly and let the resource manager test it.
|
||||
*/
|
||||
if (md->type == EFI_CONVENTIONAL_MEMORY) {
|
||||
request_resource(res, code_resource);
|
||||
request_resource(res, data_resource);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Convenience functions to obtain memory types and attributes
|
||||
*/
|
||||
|
||||
u32 efi_mem_type(unsigned long phys_addr)
|
||||
{
|
||||
efi_memory_desc_t *md;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < memmap.nr_map; i++) {
|
||||
md = &memmap.map[i];
|
||||
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;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < memmap.nr_map; i++) {
|
||||
md = &memmap.map[i];
|
||||
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