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-rw-r--r--arch/arm64/kernel/Makefile3
-rw-r--r--arch/arm64/kernel/efi-entry.S109
-rw-r--r--arch/arm64/kernel/efi-stub.c81
-rw-r--r--arch/arm64/kernel/efi.c469
-rw-r--r--arch/arm64/kernel/head.S112
-rw-r--r--arch/arm64/kernel/setup.c5
6 files changed, 779 insertions, 0 deletions
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 7a6fce5167e9..ba5e17a522d5 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -4,6 +4,8 @@
4 4
5CPPFLAGS_vmlinux.lds := -DTEXT_OFFSET=$(TEXT_OFFSET) 5CPPFLAGS_vmlinux.lds := -DTEXT_OFFSET=$(TEXT_OFFSET)
6AFLAGS_head.o := -DTEXT_OFFSET=$(TEXT_OFFSET) 6AFLAGS_head.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
7CFLAGS_efi-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET) \
8 -I$(src)/../../../scripts/dtc/libfdt
7 9
8# Object file lists. 10# Object file lists.
9arm64-obj-y := cputable.o debug-monitors.o entry.o irq.o fpsimd.o \ 11arm64-obj-y := cputable.o debug-monitors.o entry.o irq.o fpsimd.o \
@@ -21,6 +23,7 @@ arm64-obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
21arm64-obj-$(CONFIG_ARM64_CPU_SUSPEND) += sleep.o suspend.o 23arm64-obj-$(CONFIG_ARM64_CPU_SUSPEND) += sleep.o suspend.o
22arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o 24arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o
23arm64-obj-$(CONFIG_KGDB) += kgdb.o 25arm64-obj-$(CONFIG_KGDB) += kgdb.o
26arm64-obj-$(CONFIG_EFI) += efi.o efi-stub.o efi-entry.o
24 27
25obj-y += $(arm64-obj-y) vdso/ 28obj-y += $(arm64-obj-y) vdso/
26obj-m += $(arm64-obj-m) 29obj-m += $(arm64-obj-m)
diff --git a/arch/arm64/kernel/efi-entry.S b/arch/arm64/kernel/efi-entry.S
new file mode 100644
index 000000000000..66716c9b9e5f
--- /dev/null
+++ b/arch/arm64/kernel/efi-entry.S
@@ -0,0 +1,109 @@
1/*
2 * EFI entry point.
3 *
4 * Copyright (C) 2013, 2014 Red Hat, Inc.
5 * Author: Mark Salter <msalter@redhat.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12#include <linux/linkage.h>
13#include <linux/init.h>
14
15#include <asm/assembler.h>
16
17#define EFI_LOAD_ERROR 0x8000000000000001
18
19 __INIT
20
21 /*
22 * We arrive here from the EFI boot manager with:
23 *
24 * * CPU in little-endian mode
25 * * MMU on with identity-mapped RAM
26 * * Icache and Dcache on
27 *
28 * We will most likely be running from some place other than where
29 * we want to be. The kernel image wants to be placed at TEXT_OFFSET
30 * from start of RAM.
31 */
32ENTRY(efi_stub_entry)
33 /*
34 * Create a stack frame to save FP/LR with extra space
35 * for image_addr variable passed to efi_entry().
36 */
37 stp x29, x30, [sp, #-32]!
38
39 /*
40 * Call efi_entry to do the real work.
41 * x0 and x1 are already set up by firmware. Current runtime
42 * address of image is calculated and passed via *image_addr.
43 *
44 * unsigned long efi_entry(void *handle,
45 * efi_system_table_t *sys_table,
46 * unsigned long *image_addr) ;
47 */
48 adrp x8, _text
49 add x8, x8, #:lo12:_text
50 add x2, sp, 16
51 str x8, [x2]
52 bl efi_entry
53 cmn x0, #1
54 b.eq efi_load_fail
55
56 /*
57 * efi_entry() will have relocated the kernel image if necessary
58 * and we return here with device tree address in x0 and the kernel
59 * entry point stored at *image_addr. Save those values in registers
60 * which are callee preserved.
61 */
62 mov x20, x0 // DTB address
63 ldr x0, [sp, #16] // relocated _text address
64 mov x21, x0
65
66 /*
67 * Flush dcache covering current runtime addresses
68 * of kernel text/data. Then flush all of icache.
69 */
70 adrp x1, _text
71 add x1, x1, #:lo12:_text
72 adrp x2, _edata
73 add x2, x2, #:lo12:_edata
74 sub x1, x2, x1
75
76 bl __flush_dcache_area
77 ic ialluis
78
79 /* Turn off Dcache and MMU */
80 mrs x0, CurrentEL
81 cmp x0, #PSR_MODE_EL2t
82 ccmp x0, #PSR_MODE_EL2h, #0x4, ne
83 b.ne 1f
84 mrs x0, sctlr_el2
85 bic x0, x0, #1 << 0 // clear SCTLR.M
86 bic x0, x0, #1 << 2 // clear SCTLR.C
87 msr sctlr_el2, x0
88 isb
89 b 2f
901:
91 mrs x0, sctlr_el1
92 bic x0, x0, #1 << 0 // clear SCTLR.M
93 bic x0, x0, #1 << 2 // clear SCTLR.C
94 msr sctlr_el1, x0
95 isb
962:
97 /* Jump to kernel entry point */
98 mov x0, x20
99 mov x1, xzr
100 mov x2, xzr
101 mov x3, xzr
102 br x21
103
104efi_load_fail:
105 mov x0, #EFI_LOAD_ERROR
106 ldp x29, x30, [sp], #32
107 ret
108
109ENDPROC(efi_stub_entry)
diff --git a/arch/arm64/kernel/efi-stub.c b/arch/arm64/kernel/efi-stub.c
new file mode 100644
index 000000000000..60e98a639ac5
--- /dev/null
+++ b/arch/arm64/kernel/efi-stub.c
@@ -0,0 +1,81 @@
1/*
2 * Copyright (C) 2013, 2014 Linaro Ltd; <roy.franz@linaro.org>
3 *
4 * This file implements the EFI boot stub for the arm64 kernel.
5 * Adapted from ARM version by Mark Salter <msalter@redhat.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12#include <linux/efi.h>
13#include <linux/libfdt.h>
14#include <asm/sections.h>
15#include <generated/compile.h>
16#include <generated/utsrelease.h>
17
18/*
19 * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
20 * start of kernel and may not cross a 2MiB boundary. We set alignment to
21 * 2MiB so we know it won't cross a 2MiB boundary.
22 */
23#define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */
24#define MAX_FDT_OFFSET SZ_512M
25
26#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
27
28static void efi_char16_printk(efi_system_table_t *sys_table_arg,
29 efi_char16_t *str);
30
31static efi_status_t efi_open_volume(efi_system_table_t *sys_table,
32 void *__image, void **__fh);
33static efi_status_t efi_file_close(void *handle);
34
35static efi_status_t
36efi_file_read(void *handle, unsigned long *size, void *addr);
37
38static efi_status_t
39efi_file_size(efi_system_table_t *sys_table, void *__fh,
40 efi_char16_t *filename_16, void **handle, u64 *file_sz);
41
42/* Include shared EFI stub code */
43#include "../../../drivers/firmware/efi/efi-stub-helper.c"
44#include "../../../drivers/firmware/efi/fdt.c"
45#include "../../../drivers/firmware/efi/arm-stub.c"
46
47
48static efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
49 unsigned long *image_addr,
50 unsigned long *image_size,
51 unsigned long *reserve_addr,
52 unsigned long *reserve_size,
53 unsigned long dram_base,
54 efi_loaded_image_t *image)
55{
56 efi_status_t status;
57 unsigned long kernel_size, kernel_memsize = 0;
58
59 /* Relocate the image, if required. */
60 kernel_size = _edata - _text;
61 if (*image_addr != (dram_base + TEXT_OFFSET)) {
62 kernel_memsize = kernel_size + (_end - _edata);
63 status = efi_relocate_kernel(sys_table, image_addr,
64 kernel_size, kernel_memsize,
65 dram_base + TEXT_OFFSET,
66 PAGE_SIZE);
67 if (status != EFI_SUCCESS) {
68 pr_efi_err(sys_table, "Failed to relocate kernel\n");
69 return status;
70 }
71 if (*image_addr != (dram_base + TEXT_OFFSET)) {
72 pr_efi_err(sys_table, "Failed to alloc kernel memory\n");
73 efi_free(sys_table, kernel_memsize, *image_addr);
74 return EFI_ERROR;
75 }
76 *image_size = kernel_memsize;
77 }
78
79
80 return EFI_SUCCESS;
81}
diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
new file mode 100644
index 000000000000..14db1f6e8d7f
--- /dev/null
+++ b/arch/arm64/kernel/efi.c
@@ -0,0 +1,469 @@
1/*
2 * Extensible Firmware Interface
3 *
4 * Based on Extensible Firmware Interface Specification version 2.4
5 *
6 * Copyright (C) 2013, 2014 Linaro Ltd.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 */
13
14#include <linux/efi.h>
15#include <linux/export.h>
16#include <linux/memblock.h>
17#include <linux/bootmem.h>
18#include <linux/of.h>
19#include <linux/of_fdt.h>
20#include <linux/sched.h>
21#include <linux/slab.h>
22
23#include <asm/cacheflush.h>
24#include <asm/efi.h>
25#include <asm/tlbflush.h>
26#include <asm/mmu_context.h>
27
28struct efi_memory_map memmap;
29
30static efi_runtime_services_t *runtime;
31
32static u64 efi_system_table;
33
34static int uefi_debug __initdata;
35static int __init uefi_debug_setup(char *str)
36{
37 uefi_debug = 1;
38
39 return 0;
40}
41early_param("uefi_debug", uefi_debug_setup);
42
43static int __init is_normal_ram(efi_memory_desc_t *md)
44{
45 if (md->attribute & EFI_MEMORY_WB)
46 return 1;
47 return 0;
48}
49
50static void __init efi_setup_idmap(void)
51{
52 struct memblock_region *r;
53 efi_memory_desc_t *md;
54 u64 paddr, npages, size;
55
56 for_each_memblock(memory, r)
57 create_id_mapping(r->base, r->size, 0);
58
59 /* map runtime io spaces */
60 for_each_efi_memory_desc(&memmap, md) {
61 if (!(md->attribute & EFI_MEMORY_RUNTIME) || is_normal_ram(md))
62 continue;
63 paddr = md->phys_addr;
64 npages = md->num_pages;
65 memrange_efi_to_native(&paddr, &npages);
66 size = npages << PAGE_SHIFT;
67 create_id_mapping(paddr, size, 1);
68 }
69}
70
71static int __init uefi_init(void)
72{
73 efi_char16_t *c16;
74 char vendor[100] = "unknown";
75 int i, retval;
76
77 efi.systab = early_memremap(efi_system_table,
78 sizeof(efi_system_table_t));
79 if (efi.systab == NULL) {
80 pr_warn("Unable to map EFI system table.\n");
81 return -ENOMEM;
82 }
83
84 set_bit(EFI_BOOT, &efi.flags);
85 set_bit(EFI_64BIT, &efi.flags);
86
87 /*
88 * Verify the EFI Table
89 */
90 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
91 pr_err("System table signature incorrect\n");
92 return -EINVAL;
93 }
94 if ((efi.systab->hdr.revision >> 16) < 2)
95 pr_warn("Warning: EFI system table version %d.%02d, expected 2.00 or greater\n",
96 efi.systab->hdr.revision >> 16,
97 efi.systab->hdr.revision & 0xffff);
98
99 /* Show what we know for posterity */
100 c16 = early_memremap(efi.systab->fw_vendor,
101 sizeof(vendor));
102 if (c16) {
103 for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i)
104 vendor[i] = c16[i];
105 vendor[i] = '\0';
106 }
107
108 pr_info("EFI v%u.%.02u by %s\n",
109 efi.systab->hdr.revision >> 16,
110 efi.systab->hdr.revision & 0xffff, vendor);
111
112 retval = efi_config_init(NULL);
113 if (retval == 0)
114 set_bit(EFI_CONFIG_TABLES, &efi.flags);
115
116 early_memunmap(c16, sizeof(vendor));
117 early_memunmap(efi.systab, sizeof(efi_system_table_t));
118
119 return retval;
120}
121
122static __initdata char memory_type_name[][32] = {
123 {"Reserved"},
124 {"Loader Code"},
125 {"Loader Data"},
126 {"Boot Code"},
127 {"Boot Data"},
128 {"Runtime Code"},
129 {"Runtime Data"},
130 {"Conventional Memory"},
131 {"Unusable Memory"},
132 {"ACPI Reclaim Memory"},
133 {"ACPI Memory NVS"},
134 {"Memory Mapped I/O"},
135 {"MMIO Port Space"},
136 {"PAL Code"},
137};
138
139/*
140 * Return true for RAM regions we want to permanently reserve.
141 */
142static __init int is_reserve_region(efi_memory_desc_t *md)
143{
144 if (!is_normal_ram(md))
145 return 0;
146
147 if (md->attribute & EFI_MEMORY_RUNTIME)
148 return 1;
149
150 if (md->type == EFI_ACPI_RECLAIM_MEMORY ||
151 md->type == EFI_RESERVED_TYPE)
152 return 1;
153
154 return 0;
155}
156
157static __init void reserve_regions(void)
158{
159 efi_memory_desc_t *md;
160 u64 paddr, npages, size;
161
162 if (uefi_debug)
163 pr_info("Processing EFI memory map:\n");
164
165 for_each_efi_memory_desc(&memmap, md) {
166 paddr = md->phys_addr;
167 npages = md->num_pages;
168
169 if (uefi_debug)
170 pr_info(" 0x%012llx-0x%012llx [%s]",
171 paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1,
172 memory_type_name[md->type]);
173
174 memrange_efi_to_native(&paddr, &npages);
175 size = npages << PAGE_SHIFT;
176
177 if (is_normal_ram(md))
178 early_init_dt_add_memory_arch(paddr, size);
179
180 if (is_reserve_region(md) ||
181 md->type == EFI_BOOT_SERVICES_CODE ||
182 md->type == EFI_BOOT_SERVICES_DATA) {
183 memblock_reserve(paddr, size);
184 if (uefi_debug)
185 pr_cont("*");
186 }
187
188 if (uefi_debug)
189 pr_cont("\n");
190 }
191}
192
193
194static u64 __init free_one_region(u64 start, u64 end)
195{
196 u64 size = end - start;
197
198 if (uefi_debug)
199 pr_info(" EFI freeing: 0x%012llx-0x%012llx\n", start, end - 1);
200
201 free_bootmem_late(start, size);
202 return size;
203}
204
205static u64 __init free_region(u64 start, u64 end)
206{
207 u64 map_start, map_end, total = 0;
208
209 if (end <= start)
210 return total;
211
212 map_start = (u64)memmap.phys_map;
213 map_end = PAGE_ALIGN(map_start + (memmap.map_end - memmap.map));
214 map_start &= PAGE_MASK;
215
216 if (start < map_end && end > map_start) {
217 /* region overlaps UEFI memmap */
218 if (start < map_start)
219 total += free_one_region(start, map_start);
220
221 if (map_end < end)
222 total += free_one_region(map_end, end);
223 } else
224 total += free_one_region(start, end);
225
226 return total;
227}
228
229static void __init free_boot_services(void)
230{
231 u64 total_freed = 0;
232 u64 keep_end, free_start, free_end;
233 efi_memory_desc_t *md;
234
235 /*
236 * If kernel uses larger pages than UEFI, we have to be careful
237 * not to inadvertantly free memory we want to keep if there is
238 * overlap at the kernel page size alignment. We do not want to
239 * free is_reserve_region() memory nor the UEFI memmap itself.
240 *
241 * The memory map is sorted, so we keep track of the end of
242 * any previous region we want to keep, remember any region
243 * we want to free and defer freeing it until we encounter
244 * the next region we want to keep. This way, before freeing
245 * it, we can clip it as needed to avoid freeing memory we
246 * want to keep for UEFI.
247 */
248
249 keep_end = 0;
250 free_start = 0;
251
252 for_each_efi_memory_desc(&memmap, md) {
253 u64 paddr, npages, size;
254
255 if (is_reserve_region(md)) {
256 /*
257 * We don't want to free any memory from this region.
258 */
259 if (free_start) {
260 /* adjust free_end then free region */
261 if (free_end > md->phys_addr)
262 free_end -= PAGE_SIZE;
263 total_freed += free_region(free_start, free_end);
264 free_start = 0;
265 }
266 keep_end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
267 continue;
268 }
269
270 if (md->type != EFI_BOOT_SERVICES_CODE &&
271 md->type != EFI_BOOT_SERVICES_DATA) {
272 /* no need to free this region */
273 continue;
274 }
275
276 /*
277 * We want to free memory from this region.
278 */
279 paddr = md->phys_addr;
280 npages = md->num_pages;
281 memrange_efi_to_native(&paddr, &npages);
282 size = npages << PAGE_SHIFT;
283
284 if (free_start) {
285 if (paddr <= free_end)
286 free_end = paddr + size;
287 else {
288 total_freed += free_region(free_start, free_end);
289 free_start = paddr;
290 free_end = paddr + size;
291 }
292 } else {
293 free_start = paddr;
294 free_end = paddr + size;
295 }
296 if (free_start < keep_end) {
297 free_start += PAGE_SIZE;
298 if (free_start >= free_end)
299 free_start = 0;
300 }
301 }
302 if (free_start)
303 total_freed += free_region(free_start, free_end);
304
305 if (total_freed)
306 pr_info("Freed 0x%llx bytes of EFI boot services memory",
307 total_freed);
308}
309
310void __init efi_init(void)
311{
312 struct efi_fdt_params params;
313
314 /* Grab UEFI information placed in FDT by stub */
315 if (!efi_get_fdt_params(&params, uefi_debug))
316 return;
317
318 efi_system_table = params.system_table;
319
320 memblock_reserve(params.mmap & PAGE_MASK,
321 PAGE_ALIGN(params.mmap_size + (params.mmap & ~PAGE_MASK)));
322 memmap.phys_map = (void *)params.mmap;
323 memmap.map = early_memremap(params.mmap, params.mmap_size);
324 memmap.map_end = memmap.map + params.mmap_size;
325 memmap.desc_size = params.desc_size;
326 memmap.desc_version = params.desc_ver;
327
328 if (uefi_init() < 0)
329 return;
330
331 reserve_regions();
332}
333
334void __init efi_idmap_init(void)
335{
336 if (!efi_enabled(EFI_BOOT))
337 return;
338
339 /* boot time idmap_pg_dir is incomplete, so fill in missing parts */
340 efi_setup_idmap();
341}
342
343static int __init remap_region(efi_memory_desc_t *md, void **new)
344{
345 u64 paddr, vaddr, npages, size;
346
347 paddr = md->phys_addr;
348 npages = md->num_pages;
349 memrange_efi_to_native(&paddr, &npages);
350 size = npages << PAGE_SHIFT;
351
352 if (is_normal_ram(md))
353 vaddr = (__force u64)ioremap_cache(paddr, size);
354 else
355 vaddr = (__force u64)ioremap(paddr, size);
356
357 if (!vaddr) {
358 pr_err("Unable to remap 0x%llx pages @ %p\n",
359 npages, (void *)paddr);
360 return 0;
361 }
362
363 /* adjust for any rounding when EFI and system pagesize differs */
364 md->virt_addr = vaddr + (md->phys_addr - paddr);
365
366 if (uefi_debug)
367 pr_info(" EFI remap 0x%012llx => %p\n",
368 md->phys_addr, (void *)md->virt_addr);
369
370 memcpy(*new, md, memmap.desc_size);
371 *new += memmap.desc_size;
372
373 return 1;
374}
375
376/*
377 * Switch UEFI from an identity map to a kernel virtual map
378 */
379static int __init arm64_enter_virtual_mode(void)
380{
381 efi_memory_desc_t *md;
382 phys_addr_t virtmap_phys;
383 void *virtmap, *virt_md;
384 efi_status_t status;
385 u64 mapsize;
386 int count = 0;
387 unsigned long flags;
388
389 if (!efi_enabled(EFI_BOOT)) {
390 pr_info("EFI services will not be available.\n");
391 return -1;
392 }
393
394 pr_info("Remapping and enabling EFI services.\n");
395
396 /* replace early memmap mapping with permanent mapping */
397 mapsize = memmap.map_end - memmap.map;
398 early_memunmap(memmap.map, mapsize);
399 memmap.map = (__force void *)ioremap_cache((phys_addr_t)memmap.phys_map,
400 mapsize);
401 memmap.map_end = memmap.map + mapsize;
402
403 efi.memmap = &memmap;
404
405 /* Map the runtime regions */
406 virtmap = kmalloc(mapsize, GFP_KERNEL);
407 if (!virtmap) {
408 pr_err("Failed to allocate EFI virtual memmap\n");
409 return -1;
410 }
411 virtmap_phys = virt_to_phys(virtmap);
412 virt_md = virtmap;
413
414 for_each_efi_memory_desc(&memmap, md) {
415 if (!(md->attribute & EFI_MEMORY_RUNTIME))
416 continue;
417 if (remap_region(md, &virt_md))
418 ++count;
419 }
420
421 efi.systab = (__force void *)efi_lookup_mapped_addr(efi_system_table);
422 if (efi.systab)
423 set_bit(EFI_SYSTEM_TABLES, &efi.flags);
424
425 local_irq_save(flags);
426 cpu_switch_mm(idmap_pg_dir, &init_mm);
427
428 /* Call SetVirtualAddressMap with the physical address of the map */
429 runtime = efi.systab->runtime;
430 efi.set_virtual_address_map = runtime->set_virtual_address_map;
431
432 status = efi.set_virtual_address_map(count * memmap.desc_size,
433 memmap.desc_size,
434 memmap.desc_version,
435 (efi_memory_desc_t *)virtmap_phys);
436 cpu_set_reserved_ttbr0();
437 flush_tlb_all();
438 local_irq_restore(flags);
439
440 kfree(virtmap);
441
442 free_boot_services();
443
444 if (status != EFI_SUCCESS) {
445 pr_err("Failed to set EFI virtual address map! [%lx]\n",
446 status);
447 return -1;
448 }
449
450 /* Set up runtime services function pointers */
451 runtime = efi.systab->runtime;
452 efi.get_time = runtime->get_time;
453 efi.set_time = runtime->set_time;
454 efi.get_wakeup_time = runtime->get_wakeup_time;
455 efi.set_wakeup_time = runtime->set_wakeup_time;
456 efi.get_variable = runtime->get_variable;
457 efi.get_next_variable = runtime->get_next_variable;
458 efi.set_variable = runtime->set_variable;
459 efi.query_variable_info = runtime->query_variable_info;
460 efi.update_capsule = runtime->update_capsule;
461 efi.query_capsule_caps = runtime->query_capsule_caps;
462 efi.get_next_high_mono_count = runtime->get_next_high_mono_count;
463 efi.reset_system = runtime->reset_system;
464
465 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
466
467 return 0;
468}
469early_initcall(arm64_enter_virtual_mode);
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index 0fd565000772..738291b5be29 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -108,8 +108,18 @@
108 /* 108 /*
109 * DO NOT MODIFY. Image header expected by Linux boot-loaders. 109 * DO NOT MODIFY. Image header expected by Linux boot-loaders.
110 */ 110 */
111#ifdef CONFIG_EFI
112efi_head:
113 /*
114 * This add instruction has no meaningful effect except that
115 * its opcode forms the magic "MZ" signature required by UEFI.
116 */
117 add x13, x18, #0x16
118 b stext
119#else
111 b stext // branch to kernel start, magic 120 b stext // branch to kernel start, magic
112 .long 0 // reserved 121 .long 0 // reserved
122#endif
113 .quad TEXT_OFFSET // Image load offset from start of RAM 123 .quad TEXT_OFFSET // Image load offset from start of RAM
114 .quad 0 // reserved 124 .quad 0 // reserved
115 .quad 0 // reserved 125 .quad 0 // reserved
@@ -120,7 +130,109 @@
120 .byte 0x52 130 .byte 0x52
121 .byte 0x4d 131 .byte 0x4d
122 .byte 0x64 132 .byte 0x64
133#ifdef CONFIG_EFI
134 .long pe_header - efi_head // Offset to the PE header.
135#else
123 .word 0 // reserved 136 .word 0 // reserved
137#endif
138
139#ifdef CONFIG_EFI
140 .align 3
141pe_header:
142 .ascii "PE"
143 .short 0
144coff_header:
145 .short 0xaa64 // AArch64
146 .short 2 // nr_sections
147 .long 0 // TimeDateStamp
148 .long 0 // PointerToSymbolTable
149 .long 1 // NumberOfSymbols
150 .short section_table - optional_header // SizeOfOptionalHeader
151 .short 0x206 // Characteristics.
152 // IMAGE_FILE_DEBUG_STRIPPED |
153 // IMAGE_FILE_EXECUTABLE_IMAGE |
154 // IMAGE_FILE_LINE_NUMS_STRIPPED
155optional_header:
156 .short 0x20b // PE32+ format
157 .byte 0x02 // MajorLinkerVersion
158 .byte 0x14 // MinorLinkerVersion
159 .long _edata - stext // SizeOfCode
160 .long 0 // SizeOfInitializedData
161 .long 0 // SizeOfUninitializedData
162 .long efi_stub_entry - efi_head // AddressOfEntryPoint
163 .long stext - efi_head // BaseOfCode
164
165extra_header_fields:
166 .quad 0 // ImageBase
167 .long 0x20 // SectionAlignment
168 .long 0x8 // FileAlignment
169 .short 0 // MajorOperatingSystemVersion
170 .short 0 // MinorOperatingSystemVersion
171 .short 0 // MajorImageVersion
172 .short 0 // MinorImageVersion
173 .short 0 // MajorSubsystemVersion
174 .short 0 // MinorSubsystemVersion
175 .long 0 // Win32VersionValue
176
177 .long _edata - efi_head // SizeOfImage
178
179 // Everything before the kernel image is considered part of the header
180 .long stext - efi_head // SizeOfHeaders
181 .long 0 // CheckSum
182 .short 0xa // Subsystem (EFI application)
183 .short 0 // DllCharacteristics
184 .quad 0 // SizeOfStackReserve
185 .quad 0 // SizeOfStackCommit
186 .quad 0 // SizeOfHeapReserve
187 .quad 0 // SizeOfHeapCommit
188 .long 0 // LoaderFlags
189 .long 0x6 // NumberOfRvaAndSizes
190
191 .quad 0 // ExportTable
192 .quad 0 // ImportTable
193 .quad 0 // ResourceTable
194 .quad 0 // ExceptionTable
195 .quad 0 // CertificationTable
196 .quad 0 // BaseRelocationTable
197
198 // Section table
199section_table:
200
201 /*
202 * The EFI application loader requires a relocation section
203 * because EFI applications must be relocatable. This is a
204 * dummy section as far as we are concerned.
205 */
206 .ascii ".reloc"
207 .byte 0
208 .byte 0 // end of 0 padding of section name
209 .long 0
210 .long 0
211 .long 0 // SizeOfRawData
212 .long 0 // PointerToRawData
213 .long 0 // PointerToRelocations
214 .long 0 // PointerToLineNumbers
215 .short 0 // NumberOfRelocations
216 .short 0 // NumberOfLineNumbers
217 .long 0x42100040 // Characteristics (section flags)
218
219
220 .ascii ".text"
221 .byte 0
222 .byte 0
223 .byte 0 // end of 0 padding of section name
224 .long _edata - stext // VirtualSize
225 .long stext - efi_head // VirtualAddress
226 .long _edata - stext // SizeOfRawData
227 .long stext - efi_head // PointerToRawData
228
229 .long 0 // PointerToRelocations (0 for executables)
230 .long 0 // PointerToLineNumbers (0 for executables)
231 .short 0 // NumberOfRelocations (0 for executables)
232 .short 0 // NumberOfLineNumbers (0 for executables)
233 .long 0xe0500020 // Characteristics (section flags)
234 .align 5
235#endif
124 236
125ENTRY(stext) 237ENTRY(stext)
126 mov x21, x0 // x21=FDT 238 mov x21, x0 // x21=FDT
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 7ec784653b29..e578171b22ff 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -41,6 +41,7 @@
41#include <linux/memblock.h> 41#include <linux/memblock.h>
42#include <linux/of_fdt.h> 42#include <linux/of_fdt.h>
43#include <linux/of_platform.h> 43#include <linux/of_platform.h>
44#include <linux/efi.h>
44 45
45#include <asm/fixmap.h> 46#include <asm/fixmap.h>
46#include <asm/cputype.h> 47#include <asm/cputype.h>
@@ -55,6 +56,7 @@
55#include <asm/traps.h> 56#include <asm/traps.h>
56#include <asm/memblock.h> 57#include <asm/memblock.h>
57#include <asm/psci.h> 58#include <asm/psci.h>
59#include <asm/efi.h>
58 60
59unsigned int processor_id; 61unsigned int processor_id;
60EXPORT_SYMBOL(processor_id); 62EXPORT_SYMBOL(processor_id);
@@ -366,11 +368,14 @@ void __init setup_arch(char **cmdline_p)
366 368
367 parse_early_param(); 369 parse_early_param();
368 370
371 efi_init();
369 arm64_memblock_init(); 372 arm64_memblock_init();
370 373
371 paging_init(); 374 paging_init();
372 request_standard_resources(); 375 request_standard_resources();
373 376
377 efi_idmap_init();
378
374 unflatten_device_tree(); 379 unflatten_device_tree();
375 380
376 psci_init(); 381 psci_init();
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-06 22:31:47 -0500