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1 /*
2  * Extensible Firmware Interface
3  *
4  * Based on Extensible Firmware Interface Specification version 1.0
5  *
6  * Copyright (C) 1999 VA Linux Systems
7  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
8  * Copyright (C) 1999-2002 Hewlett-Packard Co.
9  *	David Mosberger-Tang <davidm@hpl.hp.com>
10  *	Stephane Eranian <eranian@hpl.hp.com>
11  *
12  * All EFI Runtime Services are not implemented yet as EFI only
13  * supports physical mode addressing on SoftSDV. This is to be fixed
14  * in a future version.  --drummond 1999-07-20
15  *
16  * Implemented EFI runtime services and virtual mode calls.  --davidm
17  *
18  * Goutham Rao: <goutham.rao@intel.com>
19  *	Skip non-WB memory and ignore empty memory ranges.
20  */
21 
22 #include <linux/kernel.h>
23 #include <linux/types.h>
24 #include <linux/ioport.h>
25 #include <linux/efi.h>
26 
27 #include <asm/io.h>
28 #include <asm/desc.h>
29 #include <asm/page.h>
30 #include <asm/pgtable.h>
31 #include <asm/tlbflush.h>
32 #include <asm/efi.h>
33 
34 /*
35  * To make EFI call EFI runtime service in physical addressing mode we need
36  * prolog/epilog before/after the invocation to claim the EFI runtime service
37  * handler exclusively and to duplicate a memory mapping in low memory space,
38  * say 0 - 3G.
39  */
40 
efi_sync_low_kernel_mappings(void)41 void efi_sync_low_kernel_mappings(void) {}
efi_dump_pagetable(void)42 void __init efi_dump_pagetable(void) {}
efi_setup_page_tables(unsigned long pa_memmap,unsigned num_pages)43 int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
44 {
45 	return 0;
46 }
efi_cleanup_page_tables(unsigned long pa_memmap,unsigned num_pages)47 void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages)
48 {
49 }
50 
efi_map_region(efi_memory_desc_t * md)51 void __init efi_map_region(efi_memory_desc_t *md)
52 {
53 	old_map_region(md);
54 }
55 
efi_map_region_fixed(efi_memory_desc_t * md)56 void __init efi_map_region_fixed(efi_memory_desc_t *md) {}
parse_efi_setup(u64 phys_addr,u32 data_len)57 void __init parse_efi_setup(u64 phys_addr, u32 data_len) {}
58 
efi_call_phys_prolog(void)59 pgd_t * __init efi_call_phys_prolog(void)
60 {
61 	struct desc_ptr gdt_descr;
62 	pgd_t *save_pgd;
63 
64 	/* Current pgd is swapper_pg_dir, we'll restore it later: */
65 	save_pgd = swapper_pg_dir;
66 	load_cr3(initial_page_table);
67 	__flush_tlb_all();
68 
69 	gdt_descr.address = __pa(get_cpu_gdt_table(0));
70 	gdt_descr.size = GDT_SIZE - 1;
71 	load_gdt(&gdt_descr);
72 
73 	return save_pgd;
74 }
75 
efi_call_phys_epilog(pgd_t * save_pgd)76 void __init efi_call_phys_epilog(pgd_t *save_pgd)
77 {
78 	struct desc_ptr gdt_descr;
79 
80 	gdt_descr.address = (unsigned long)get_cpu_gdt_table(0);
81 	gdt_descr.size = GDT_SIZE - 1;
82 	load_gdt(&gdt_descr);
83 
84 	load_cr3(save_pgd);
85 	__flush_tlb_all();
86 }
87 
efi_runtime_mkexec(void)88 void __init efi_runtime_mkexec(void)
89 {
90 	if (__supported_pte_mask & _PAGE_NX)
91 		runtime_code_page_mkexec();
92 }
93