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)
19 #include <u-boot/zlib.h>
20 #include <asm/byteorder.h>
21 #include <linux/libfdt.h>
23 #include <fdt_support.h>
24 #include <asm/bootm.h>
25 #include <asm/secure.h>
26 #include <linux/compiler.h>
30 #ifdef CONFIG_ARMV7_NONSEC
31 #include <asm/armv7.h>
33 #include <asm/setup.h>
35 DECLARE_GLOBAL_DATA_PTR;
37 static struct tag *params;
39 static ulong get_sp(void)
43 asm("mov %0, sp" : "=r"(ret) : );
47 void arch_lmb_reserve(struct lmb *lmb)
53 * Booting a (Linux) kernel image
55 * Allocate space for command line and board info - the
56 * address should be as high as possible within the reach of
57 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
58 * memory, which means far enough below the current stack
62 debug("## Current stack ends at 0x%08lx ", sp);
64 /* adjust sp by 4K to be safe */
66 for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
67 if (!gd->bd->bi_dram[bank].size ||
68 sp < gd->bd->bi_dram[bank].start)
70 /* Watch out for RAM at end of address space! */
71 bank_end = gd->bd->bi_dram[bank].start +
72 gd->bd->bi_dram[bank].size - 1;
75 lmb_reserve(lmb, sp, bank_end - sp + 1);
80 __weak void board_quiesce_devices(void)
85 * announce_and_cleanup() - Print message and prepare for kernel boot
87 * @fake: non-zero to do everything except actually boot
89 static void announce_and_cleanup(int fake)
91 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
92 #ifdef CONFIG_BOOTSTAGE_FDT
93 bootstage_fdt_add_report();
95 #ifdef CONFIG_BOOTSTAGE_REPORT
99 #ifdef CONFIG_USB_DEVICE
103 board_quiesce_devices();
105 printf("\nStarting kernel ...%s\n\n", fake ?
106 "(fake run for tracing)" : "");
108 * Call remove function of all devices with a removal flag set.
109 * This may be useful for last-stage operations, like cancelling
110 * of DMA operation or releasing device internal buffers.
112 dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);
114 cleanup_before_linux();
117 static void setup_start_tag (bd_t *bd)
119 params = (struct tag *)bd->bi_boot_params;
121 params->hdr.tag = ATAG_CORE;
122 params->hdr.size = tag_size (tag_core);
124 params->u.core.flags = 0;
125 params->u.core.pagesize = 0;
126 params->u.core.rootdev = 0;
128 params = tag_next (params);
131 static void setup_memory_tags(bd_t *bd)
135 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
136 params->hdr.tag = ATAG_MEM;
137 params->hdr.size = tag_size (tag_mem32);
139 params->u.mem.start = bd->bi_dram[i].start;
140 params->u.mem.size = bd->bi_dram[i].size;
142 params = tag_next (params);
146 static void setup_commandline_tag(bd_t *bd, char *commandline)
153 /* eat leading white space */
154 for (p = commandline; *p == ' '; p++);
156 /* skip non-existent command lines so the kernel will still
157 * use its default command line.
162 params->hdr.tag = ATAG_CMDLINE;
164 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
166 strcpy (params->u.cmdline.cmdline, p);
168 params = tag_next (params);
171 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
173 /* an ATAG_INITRD node tells the kernel where the compressed
174 * ramdisk can be found. ATAG_RDIMG is a better name, actually.
176 params->hdr.tag = ATAG_INITRD2;
177 params->hdr.size = tag_size (tag_initrd);
179 params->u.initrd.start = initrd_start;
180 params->u.initrd.size = initrd_end - initrd_start;
182 params = tag_next (params);
185 static void setup_serial_tag(struct tag **tmp)
187 struct tag *params = *tmp;
188 struct tag_serialnr serialnr;
190 get_board_serial(&serialnr);
191 params->hdr.tag = ATAG_SERIAL;
192 params->hdr.size = tag_size (tag_serialnr);
193 params->u.serialnr.low = serialnr.low;
194 params->u.serialnr.high= serialnr.high;
195 params = tag_next (params);
199 static void setup_revision_tag(struct tag **in_params)
203 rev = get_board_rev();
204 params->hdr.tag = ATAG_REVISION;
205 params->hdr.size = tag_size (tag_revision);
206 params->u.revision.rev = rev;
207 params = tag_next (params);
210 static void setup_end_tag(bd_t *bd)
212 params->hdr.tag = ATAG_NONE;
213 params->hdr.size = 0;
216 __weak void setup_board_tags(struct tag **in_params) {}
219 static void do_nonsec_virt_switch(void)
222 dcache_disable(); /* flush cache before swtiching to EL2 */
226 /* Subcommand: PREP */
227 static void boot_prep_linux(bootm_headers_t *images)
229 char *commandline = env_get("bootargs");
231 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
232 #ifdef CONFIG_OF_LIBFDT
233 debug("using: FDT\n");
234 if (image_setup_linux(images)) {
235 printf("FDT creation failed! hanging...");
239 } else if (BOOTM_ENABLE_TAGS) {
240 debug("using: ATAGS\n");
241 setup_start_tag(gd->bd);
242 if (BOOTM_ENABLE_SERIAL_TAG)
243 setup_serial_tag(¶ms);
244 if (BOOTM_ENABLE_CMDLINE_TAG)
245 setup_commandline_tag(gd->bd, commandline);
246 if (BOOTM_ENABLE_REVISION_TAG)
247 setup_revision_tag(¶ms);
248 if (BOOTM_ENABLE_MEMORY_TAGS)
249 setup_memory_tags(gd->bd);
250 if (BOOTM_ENABLE_INITRD_TAG) {
252 * In boot_ramdisk_high(), it may relocate ramdisk to
253 * a specified location. And set images->initrd_start &
254 * images->initrd_end to relocated ramdisk's start/end
255 * addresses. So use them instead of images->rd_start &
256 * images->rd_end when possible.
258 if (images->initrd_start && images->initrd_end) {
259 setup_initrd_tag(gd->bd, images->initrd_start,
261 } else if (images->rd_start && images->rd_end) {
262 setup_initrd_tag(gd->bd, images->rd_start,
266 setup_board_tags(¶ms);
267 setup_end_tag(gd->bd);
269 printf("FDT and ATAGS support not compiled in - hanging\n");
274 __weak bool armv7_boot_nonsec_default(void)
276 #ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT
283 #ifdef CONFIG_ARMV7_NONSEC
284 bool armv7_boot_nonsec(void)
286 char *s = env_get("bootm_boot_mode");
287 bool nonsec = armv7_boot_nonsec_default();
289 if (s && !strcmp(s, "sec"))
292 if (s && !strcmp(s, "nonsec"))
300 __weak void update_os_arch_secondary_cores(uint8_t os_arch)
304 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
305 static void switch_to_el1(void)
307 if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
308 (images.os.arch == IH_ARCH_ARM))
309 armv8_switch_to_el1(0, (u64)gd->bd->bi_arch_number,
310 (u64)images.ft_addr, 0,
314 armv8_switch_to_el1((u64)images.ft_addr, 0, 0, 0,
322 static void boot_jump_linux(bootm_headers_t *images, int flag)
325 void (*kernel_entry)(void *fdt_addr, void *res0, void *res1,
327 int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
329 kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1,
330 void *res2))images->ep;
332 debug("## Transferring control to Linux (at address %lx)...\n",
333 (ulong) kernel_entry);
334 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
336 announce_and_cleanup(fake);
339 #ifdef CONFIG_ARMV8_PSCI
342 do_nonsec_virt_switch();
344 update_os_arch_secondary_cores(images->os.arch);
346 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
347 armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
348 (u64)switch_to_el1, ES_TO_AARCH64);
350 if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
351 (images->os.arch == IH_ARCH_ARM))
352 armv8_switch_to_el2(0, (u64)gd->bd->bi_arch_number,
353 (u64)images->ft_addr, 0,
357 armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
363 unsigned long machid = gd->bd->bi_arch_number;
365 void (*kernel_entry)(int zero, int arch, uint params);
367 int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
369 kernel_entry = (void (*)(int, int, uint))images->ep;
370 #ifdef CONFIG_CPU_V7M
371 ulong addr = (ulong)kernel_entry | 1;
372 kernel_entry = (void *)addr;
374 s = env_get("machid");
376 if (strict_strtoul(s, 16, &machid) < 0) {
377 debug("strict_strtoul failed!\n");
380 printf("Using machid 0x%lx from environment\n", machid);
383 debug("## Transferring control to Linux (at address %08lx)" \
384 "...\n", (ulong) kernel_entry);
385 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
386 announce_and_cleanup(fake);
388 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
389 r2 = (unsigned long)images->ft_addr;
391 r2 = gd->bd->bi_boot_params;
394 #ifdef CONFIG_ARMV7_NONSEC
395 if (armv7_boot_nonsec()) {
397 secure_ram_addr(_do_nonsec_entry)(kernel_entry,
401 kernel_entry(0, machid, r2);
406 /* Main Entry point for arm bootm implementation
408 * Modeled after the powerpc implementation
409 * DIFFERENCE: Instead of calling prep and go at the end
410 * they are called if subcommand is equal 0.
412 int do_bootm_linux(int flag, int argc, char * const argv[],
413 bootm_headers_t *images)
415 /* No need for those on ARM */
416 if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
419 if (flag & BOOTM_STATE_OS_PREP) {
420 boot_prep_linux(images);
424 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
425 boot_jump_linux(images, flag);
429 boot_prep_linux(images);
430 boot_jump_linux(images, flag);
434 #if defined(CONFIG_BOOTM_VXWORKS)
435 void boot_prep_vxworks(bootm_headers_t *images)
437 #if defined(CONFIG_OF_LIBFDT)
440 if (images->ft_addr) {
441 off = fdt_path_offset(images->ft_addr, "/memory");
443 if (arch_fixup_fdt(images->ft_addr))
444 puts("## WARNING: fixup memory failed!\n");
448 cleanup_before_linux();
450 void boot_jump_vxworks(bootm_headers_t *images)
452 #if defined(CONFIG_ARM64) && defined(CONFIG_ARMV8_PSCI)
457 /* ARM VxWorks requires device tree physical address to be passed */
458 ((void (*)(void *))images->ep)(images->ft_addr);