1 // SPDX-License-Identifier: GPL-2.0+
3 * Corscience GmbH & Co. KG - Simon Schwarz <schwarz@corscience.de>
4 * - Added prep subcommand support
5 * - Reorganized source - modeled after powerpc version
8 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
9 * Marius Groeger <mgroeger@sysgo.de>
11 * Copyright (C) 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
22 #include <u-boot/zlib.h>
23 #include <asm/byteorder.h>
24 #include <linux/libfdt.h>
26 #include <fdt_support.h>
27 #include <asm/bootm.h>
28 #include <asm/secure.h>
29 #include <linux/compiler.h>
32 #include <asm/cache.h>
34 #ifdef CONFIG_ARMV7_NONSEC
35 #include <asm/armv7.h>
37 #include <asm/setup.h>
39 DECLARE_GLOBAL_DATA_PTR;
41 static struct tag *params;
43 static ulong get_sp(void)
47 asm("mov %0, sp" : "=r"(ret) : );
51 void arch_lmb_reserve(struct lmb *lmb)
57 * Booting a (Linux) kernel image
59 * Allocate space for command line and board info - the
60 * address should be as high as possible within the reach of
61 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
62 * memory, which means far enough below the current stack
66 debug("## Current stack ends at 0x%08lx ", sp);
68 /* adjust sp by 4K to be safe */
70 for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
71 if (!gd->bd->bi_dram[bank].size ||
72 sp < gd->bd->bi_dram[bank].start)
74 /* Watch out for RAM at end of address space! */
75 bank_end = gd->bd->bi_dram[bank].start +
76 gd->bd->bi_dram[bank].size - 1;
79 if (bank_end > gd->ram_top)
80 bank_end = gd->ram_top - 1;
82 lmb_reserve(lmb, sp, bank_end - sp + 1);
87 __weak void board_quiesce_devices(void)
92 * announce_and_cleanup() - Print message and prepare for kernel boot
94 * @fake: non-zero to do everything except actually boot
96 static void announce_and_cleanup(int fake)
98 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
99 #ifdef CONFIG_BOOTSTAGE_FDT
100 bootstage_fdt_add_report();
102 #ifdef CONFIG_BOOTSTAGE_REPORT
106 #ifdef CONFIG_USB_DEVICE
110 board_quiesce_devices();
112 printf("\nStarting kernel ...%s\n\n", fake ?
113 "(fake run for tracing)" : "");
115 * Call remove function of all devices with a removal flag set.
116 * This may be useful for last-stage operations, like cancelling
117 * of DMA operation or releasing device internal buffers.
119 dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);
121 cleanup_before_linux();
124 static void setup_start_tag (bd_t *bd)
126 params = (struct tag *)bd->bi_boot_params;
128 params->hdr.tag = ATAG_CORE;
129 params->hdr.size = tag_size (tag_core);
131 params->u.core.flags = 0;
132 params->u.core.pagesize = 0;
133 params->u.core.rootdev = 0;
135 params = tag_next (params);
138 static void setup_memory_tags(bd_t *bd)
142 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
143 params->hdr.tag = ATAG_MEM;
144 params->hdr.size = tag_size (tag_mem32);
146 params->u.mem.start = bd->bi_dram[i].start;
147 params->u.mem.size = bd->bi_dram[i].size;
149 params = tag_next (params);
153 static void setup_commandline_tag(bd_t *bd, char *commandline)
160 /* eat leading white space */
161 for (p = commandline; *p == ' '; p++);
163 /* skip non-existent command lines so the kernel will still
164 * use its default command line.
169 params->hdr.tag = ATAG_CMDLINE;
171 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
173 strcpy (params->u.cmdline.cmdline, p);
175 params = tag_next (params);
178 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
180 /* an ATAG_INITRD node tells the kernel where the compressed
181 * ramdisk can be found. ATAG_RDIMG is a better name, actually.
183 params->hdr.tag = ATAG_INITRD2;
184 params->hdr.size = tag_size (tag_initrd);
186 params->u.initrd.start = initrd_start;
187 params->u.initrd.size = initrd_end - initrd_start;
189 params = tag_next (params);
192 static void setup_serial_tag(struct tag **tmp)
194 struct tag *params = *tmp;
195 struct tag_serialnr serialnr;
197 get_board_serial(&serialnr);
198 params->hdr.tag = ATAG_SERIAL;
199 params->hdr.size = tag_size (tag_serialnr);
200 params->u.serialnr.low = serialnr.low;
201 params->u.serialnr.high= serialnr.high;
202 params = tag_next (params);
206 static void setup_revision_tag(struct tag **in_params)
210 rev = get_board_rev();
211 params->hdr.tag = ATAG_REVISION;
212 params->hdr.size = tag_size (tag_revision);
213 params->u.revision.rev = rev;
214 params = tag_next (params);
217 static void setup_end_tag(bd_t *bd)
219 params->hdr.tag = ATAG_NONE;
220 params->hdr.size = 0;
223 __weak void setup_board_tags(struct tag **in_params) {}
226 static void do_nonsec_virt_switch(void)
229 dcache_disable(); /* flush cache before swtiching to EL2 */
233 __weak void board_prep_linux(bootm_headers_t *images) { }
235 /* Subcommand: PREP */
236 static void boot_prep_linux(bootm_headers_t *images)
238 char *commandline = env_get("bootargs");
240 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
241 #ifdef CONFIG_OF_LIBFDT
242 debug("using: FDT\n");
243 if (image_setup_linux(images)) {
244 printf("FDT creation failed! hanging...");
248 } else if (BOOTM_ENABLE_TAGS) {
249 debug("using: ATAGS\n");
250 setup_start_tag(gd->bd);
251 if (BOOTM_ENABLE_SERIAL_TAG)
252 setup_serial_tag(¶ms);
253 if (BOOTM_ENABLE_CMDLINE_TAG)
254 setup_commandline_tag(gd->bd, commandline);
255 if (BOOTM_ENABLE_REVISION_TAG)
256 setup_revision_tag(¶ms);
257 if (BOOTM_ENABLE_MEMORY_TAGS)
258 setup_memory_tags(gd->bd);
259 if (BOOTM_ENABLE_INITRD_TAG) {
261 * In boot_ramdisk_high(), it may relocate ramdisk to
262 * a specified location. And set images->initrd_start &
263 * images->initrd_end to relocated ramdisk's start/end
264 * addresses. So use them instead of images->rd_start &
265 * images->rd_end when possible.
267 if (images->initrd_start && images->initrd_end) {
268 setup_initrd_tag(gd->bd, images->initrd_start,
270 } else if (images->rd_start && images->rd_end) {
271 setup_initrd_tag(gd->bd, images->rd_start,
275 setup_board_tags(¶ms);
276 setup_end_tag(gd->bd);
278 printf("FDT and ATAGS support not compiled in - hanging\n");
282 board_prep_linux(images);
285 __weak bool armv7_boot_nonsec_default(void)
287 #ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT
294 #ifdef CONFIG_ARMV7_NONSEC
295 bool armv7_boot_nonsec(void)
297 char *s = env_get("bootm_boot_mode");
298 bool nonsec = armv7_boot_nonsec_default();
300 if (s && !strcmp(s, "sec"))
303 if (s && !strcmp(s, "nonsec"))
311 __weak void update_os_arch_secondary_cores(uint8_t os_arch)
315 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
316 static void switch_to_el1(void)
318 if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
319 (images.os.arch == IH_ARCH_ARM))
320 armv8_switch_to_el1(0, (u64)gd->bd->bi_arch_number,
321 (u64)images.ft_addr, 0,
325 armv8_switch_to_el1((u64)images.ft_addr, 0, 0, 0,
333 static void boot_jump_linux(bootm_headers_t *images, int flag)
336 void (*kernel_entry)(void *fdt_addr, void *res0, void *res1,
338 int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
340 kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1,
341 void *res2))images->ep;
343 debug("## Transferring control to Linux (at address %lx)...\n",
344 (ulong) kernel_entry);
345 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
347 announce_and_cleanup(fake);
350 #ifdef CONFIG_ARMV8_PSCI
353 do_nonsec_virt_switch();
355 update_os_arch_secondary_cores(images->os.arch);
357 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
358 armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
359 (u64)switch_to_el1, ES_TO_AARCH64);
361 if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
362 (images->os.arch == IH_ARCH_ARM))
363 armv8_switch_to_el2(0, (u64)gd->bd->bi_arch_number,
364 (u64)images->ft_addr, 0,
368 armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
374 unsigned long machid = gd->bd->bi_arch_number;
376 void (*kernel_entry)(int zero, int arch, uint params);
378 int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
380 kernel_entry = (void (*)(int, int, uint))images->ep;
381 #ifdef CONFIG_CPU_V7M
382 ulong addr = (ulong)kernel_entry | 1;
383 kernel_entry = (void *)addr;
385 s = env_get("machid");
387 if (strict_strtoul(s, 16, &machid) < 0) {
388 debug("strict_strtoul failed!\n");
391 printf("Using machid 0x%lx from environment\n", machid);
394 debug("## Transferring control to Linux (at address %08lx)" \
395 "...\n", (ulong) kernel_entry);
396 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
397 announce_and_cleanup(fake);
399 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
400 r2 = (unsigned long)images->ft_addr;
402 r2 = gd->bd->bi_boot_params;
405 #ifdef CONFIG_ARMV7_NONSEC
406 if (armv7_boot_nonsec()) {
408 secure_ram_addr(_do_nonsec_entry)(kernel_entry,
412 kernel_entry(0, machid, r2);
417 /* Main Entry point for arm bootm implementation
419 * Modeled after the powerpc implementation
420 * DIFFERENCE: Instead of calling prep and go at the end
421 * they are called if subcommand is equal 0.
423 int do_bootm_linux(int flag, int argc, char * const argv[],
424 bootm_headers_t *images)
426 /* No need for those on ARM */
427 if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
430 if (flag & BOOTM_STATE_OS_PREP) {
431 boot_prep_linux(images);
435 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
436 boot_jump_linux(images, flag);
440 boot_prep_linux(images);
441 boot_jump_linux(images, flag);
445 #if defined(CONFIG_BOOTM_VXWORKS)
446 void boot_prep_vxworks(bootm_headers_t *images)
448 #if defined(CONFIG_OF_LIBFDT)
451 if (images->ft_addr) {
452 off = fdt_path_offset(images->ft_addr, "/memory");
454 if (arch_fixup_fdt(images->ft_addr))
455 puts("## WARNING: fixup memory failed!\n");
459 cleanup_before_linux();
461 void boot_jump_vxworks(bootm_headers_t *images)
463 #if defined(CONFIG_ARM64) && defined(CONFIG_ARMV8_PSCI)
468 /* ARM VxWorks requires device tree physical address to be passed */
469 ((void (*)(void *))images->ep)(images->ft_addr);