e429795c68
This patch removes the duplicated code between efi_32.c and efi.c. Signed-off-by: Huang Ying <ying.huang@intel.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
292 lines
7.3 KiB
C
292 lines
7.3 KiB
C
/*
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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/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 <linux/kexec.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 PFX "EFI: "
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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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void efi_call_phys_prelog(void) __acquires(efi_rt_lock)
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{
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unsigned long cr4;
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unsigned long temp;
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struct desc_ptr gdt_descr;
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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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cr4 = read_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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gdt_descr.address = __pa(get_cpu_gdt_table(0));
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gdt_descr.size = GDT_SIZE - 1;
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load_gdt(&gdt_descr);
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}
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void efi_call_phys_epilog(void) __releases(efi_rt_lock)
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{
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unsigned long cr4;
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struct desc_ptr gdt_descr;
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gdt_descr.address = (unsigned long)get_cpu_gdt_table(0);
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gdt_descr.size = GDT_SIZE - 1;
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load_gdt(&gdt_descr);
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cr4 = read_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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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 = bt_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 PFX "Could not remap the EFI memmap!\n");
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memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
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}
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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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} uninitialized_var(prev), curr;
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efi_memory_desc_t *md;
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unsigned long start, end;
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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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md = p;
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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
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efi_initialize_iomem_resources(struct resource *code_resource,
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struct resource *data_resource,
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struct resource *bss_resource)
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{
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struct resource *res;
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efi_memory_desc_t *md;
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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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md = p;
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if ((md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT)) >
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0x100000000ULL)
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continue;
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res = kzalloc(sizeof(struct resource), GFP_ATOMIC);
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switch (md->type) {
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case EFI_RESERVED_TYPE:
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res->name = "Reserved Memory";
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break;
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case EFI_LOADER_CODE:
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res->name = "Loader Code";
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break;
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case EFI_LOADER_DATA:
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res->name = "Loader Data";
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break;
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case EFI_BOOT_SERVICES_DATA:
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res->name = "BootServices Data";
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break;
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case EFI_BOOT_SERVICES_CODE:
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res->name = "BootServices Code";
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break;
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case EFI_RUNTIME_SERVICES_CODE:
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res->name = "Runtime Service Code";
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break;
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case EFI_RUNTIME_SERVICES_DATA:
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res->name = "Runtime Service Data";
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break;
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case EFI_CONVENTIONAL_MEMORY:
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res->name = "Conventional Memory";
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break;
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case EFI_UNUSABLE_MEMORY:
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res->name = "Unusable Memory";
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break;
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case EFI_ACPI_RECLAIM_MEMORY:
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res->name = "ACPI Reclaim";
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break;
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case EFI_ACPI_MEMORY_NVS:
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res->name = "ACPI NVS";
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break;
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case EFI_MEMORY_MAPPED_IO:
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res->name = "Memory Mapped IO";
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break;
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case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
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res->name = "Memory Mapped IO Port Space";
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break;
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default:
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res->name = "Reserved";
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break;
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}
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res->start = md->phys_addr;
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res->end = res->start + ((md->num_pages << EFI_PAGE_SHIFT) - 1);
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res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
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if (request_resource(&iomem_resource, res) < 0)
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printk(KERN_ERR PFX "Failed to allocate res %s : "
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"0x%llx-0x%llx\n", res->name,
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(unsigned long long)res->start,
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(unsigned long long)res->end);
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/*
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* We don't know which region contains kernel data so we try
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* it repeatedly and let the resource manager test it.
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*/
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if (md->type == EFI_CONVENTIONAL_MEMORY) {
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request_resource(res, code_resource);
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request_resource(res, data_resource);
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request_resource(res, bss_resource);
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#ifdef CONFIG_KEXEC
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request_resource(res, &crashk_res);
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#endif
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}
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}
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}
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