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)
21 #include <u-boot/zlib.h>
22 #include <asm/byteorder.h>
23 #include <linux/libfdt.h>
25 #include <fdt_support.h>
26 #include <asm/bootm.h>
27 #include <asm/secure.h>
28 #include <linux/compiler.h>
32 #ifdef CONFIG_ARMV7_NONSEC
33 #include <asm/armv7.h>
35 #include <asm/setup.h>
37 DECLARE_GLOBAL_DATA_PTR;
39 static struct tag *params;
41 static ulong get_sp(void)
45 asm("mov %0, sp" : "=r"(ret) : );
49 void arch_lmb_reserve(struct lmb *lmb)
55 * Booting a (Linux) kernel image
57 * Allocate space for command line and board info - the
58 * address should be as high as possible within the reach of
59 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
60 * memory, which means far enough below the current stack
64 debug("## Current stack ends at 0x%08lx ", sp);
66 /* adjust sp by 4K to be safe */
68 for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
69 if (!gd->bd->bi_dram[bank].size ||
70 sp < gd->bd->bi_dram[bank].start)
72 /* Watch out for RAM at end of address space! */
73 bank_end = gd->bd->bi_dram[bank].start +
74 gd->bd->bi_dram[bank].size - 1;
77 lmb_reserve(lmb, sp, bank_end - sp + 1);
82 __weak void board_quiesce_devices(void)
87 * announce_and_cleanup() - Print message and prepare for kernel boot
89 * @fake: non-zero to do everything except actually boot
91 static void announce_and_cleanup(int fake)
93 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
94 #ifdef CONFIG_BOOTSTAGE_FDT
95 bootstage_fdt_add_report();
97 #ifdef CONFIG_BOOTSTAGE_REPORT
101 #ifdef CONFIG_USB_DEVICE
105 board_quiesce_devices();
107 printf("\nStarting kernel ...%s\n\n", fake ?
108 "(fake run for tracing)" : "");
110 * Call remove function of all devices with a removal flag set.
111 * This may be useful for last-stage operations, like cancelling
112 * of DMA operation or releasing device internal buffers.
114 dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);
116 cleanup_before_linux();
119 static void setup_start_tag (bd_t *bd)
121 params = (struct tag *)bd->bi_boot_params;
123 params->hdr.tag = ATAG_CORE;
124 params->hdr.size = tag_size (tag_core);
126 params->u.core.flags = 0;
127 params->u.core.pagesize = 0;
128 params->u.core.rootdev = 0;
130 params = tag_next (params);
133 static void setup_memory_tags(bd_t *bd)
137 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
138 params->hdr.tag = ATAG_MEM;
139 params->hdr.size = tag_size (tag_mem32);
141 params->u.mem.start = bd->bi_dram[i].start;
142 params->u.mem.size = bd->bi_dram[i].size;
144 params = tag_next (params);
148 static void setup_commandline_tag(bd_t *bd, char *commandline)
155 /* eat leading white space */
156 for (p = commandline; *p == ' '; p++);
158 /* skip non-existent command lines so the kernel will still
159 * use its default command line.
164 params->hdr.tag = ATAG_CMDLINE;
166 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
168 strcpy (params->u.cmdline.cmdline, p);
170 params = tag_next (params);
173 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
175 /* an ATAG_INITRD node tells the kernel where the compressed
176 * ramdisk can be found. ATAG_RDIMG is a better name, actually.
178 params->hdr.tag = ATAG_INITRD2;
179 params->hdr.size = tag_size (tag_initrd);
181 params->u.initrd.start = initrd_start;
182 params->u.initrd.size = initrd_end - initrd_start;
184 params = tag_next (params);
187 static void setup_serial_tag(struct tag **tmp)
189 struct tag *params = *tmp;
190 struct tag_serialnr serialnr;
192 get_board_serial(&serialnr);
193 params->hdr.tag = ATAG_SERIAL;
194 params->hdr.size = tag_size (tag_serialnr);
195 params->u.serialnr.low = serialnr.low;
196 params->u.serialnr.high= serialnr.high;
197 params = tag_next (params);
201 static void setup_revision_tag(struct tag **in_params)
205 rev = get_board_rev();
206 params->hdr.tag = ATAG_REVISION;
207 params->hdr.size = tag_size (tag_revision);
208 params->u.revision.rev = rev;
209 params = tag_next (params);
212 static void setup_end_tag(bd_t *bd)
214 params->hdr.tag = ATAG_NONE;
215 params->hdr.size = 0;
218 __weak void setup_board_tags(struct tag **in_params) {}
221 static void do_nonsec_virt_switch(void)
224 dcache_disable(); /* flush cache before swtiching to EL2 */
228 __weak void board_prep_linux(bootm_headers_t *images) { }
230 /* Subcommand: PREP */
231 static void boot_prep_linux(bootm_headers_t *images)
233 char *commandline = env_get("bootargs");
235 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
236 #ifdef CONFIG_OF_LIBFDT
237 debug("using: FDT\n");
238 if (image_setup_linux(images)) {
239 printf("FDT creation failed! hanging...");
243 } else if (BOOTM_ENABLE_TAGS) {
244 debug("using: ATAGS\n");
245 setup_start_tag(gd->bd);
246 if (BOOTM_ENABLE_SERIAL_TAG)
247 setup_serial_tag(¶ms);
248 if (BOOTM_ENABLE_CMDLINE_TAG)
249 setup_commandline_tag(gd->bd, commandline);
250 if (BOOTM_ENABLE_REVISION_TAG)
251 setup_revision_tag(¶ms);
252 if (BOOTM_ENABLE_MEMORY_TAGS)
253 setup_memory_tags(gd->bd);
254 if (BOOTM_ENABLE_INITRD_TAG) {
256 * In boot_ramdisk_high(), it may relocate ramdisk to
257 * a specified location. And set images->initrd_start &
258 * images->initrd_end to relocated ramdisk's start/end
259 * addresses. So use them instead of images->rd_start &
260 * images->rd_end when possible.
262 if (images->initrd_start && images->initrd_end) {
263 setup_initrd_tag(gd->bd, images->initrd_start,
265 } else if (images->rd_start && images->rd_end) {
266 setup_initrd_tag(gd->bd, images->rd_start,
270 setup_board_tags(¶ms);
271 setup_end_tag(gd->bd);
273 printf("FDT and ATAGS support not compiled in - hanging\n");
277 board_prep_linux(images);
280 __weak bool armv7_boot_nonsec_default(void)
282 #ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT
289 #ifdef CONFIG_ARMV7_NONSEC
290 bool armv7_boot_nonsec(void)
292 char *s = env_get("bootm_boot_mode");
293 bool nonsec = armv7_boot_nonsec_default();
295 if (s && !strcmp(s, "sec"))
298 if (s && !strcmp(s, "nonsec"))
306 __weak void update_os_arch_secondary_cores(uint8_t os_arch)
310 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
311 static void switch_to_el1(void)
313 if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
314 (images.os.arch == IH_ARCH_ARM))
315 armv8_switch_to_el1(0, (u64)gd->bd->bi_arch_number,
316 (u64)images.ft_addr, 0,
320 armv8_switch_to_el1((u64)images.ft_addr, 0, 0, 0,
328 static void boot_jump_linux(bootm_headers_t *images, int flag)
331 void (*kernel_entry)(void *fdt_addr, void *res0, void *res1,
333 int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
335 kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1,
336 void *res2))images->ep;
338 debug("## Transferring control to Linux (at address %lx)...\n",
339 (ulong) kernel_entry);
340 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
342 announce_and_cleanup(fake);
345 #ifdef CONFIG_ARMV8_PSCI
348 do_nonsec_virt_switch();
350 update_os_arch_secondary_cores(images->os.arch);
352 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
353 armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
354 (u64)switch_to_el1, ES_TO_AARCH64);
356 if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
357 (images->os.arch == IH_ARCH_ARM))
358 armv8_switch_to_el2(0, (u64)gd->bd->bi_arch_number,
359 (u64)images->ft_addr, 0,
363 armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
369 unsigned long machid = gd->bd->bi_arch_number;
371 void (*kernel_entry)(int zero, int arch, uint params);
373 int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
375 kernel_entry = (void (*)(int, int, uint))images->ep;
376 #ifdef CONFIG_CPU_V7M
377 ulong addr = (ulong)kernel_entry | 1;
378 kernel_entry = (void *)addr;
380 s = env_get("machid");
382 if (strict_strtoul(s, 16, &machid) < 0) {
383 debug("strict_strtoul failed!\n");
386 printf("Using machid 0x%lx from environment\n", machid);
389 debug("## Transferring control to Linux (at address %08lx)" \
390 "...\n", (ulong) kernel_entry);
391 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
392 announce_and_cleanup(fake);
394 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
395 r2 = (unsigned long)images->ft_addr;
397 r2 = gd->bd->bi_boot_params;
400 #ifdef CONFIG_ARMV7_NONSEC
401 if (armv7_boot_nonsec()) {
403 secure_ram_addr(_do_nonsec_entry)(kernel_entry,
407 kernel_entry(0, machid, r2);
412 /* Main Entry point for arm bootm implementation
414 * Modeled after the powerpc implementation
415 * DIFFERENCE: Instead of calling prep and go at the end
416 * they are called if subcommand is equal 0.
418 int do_bootm_linux(int flag, int argc, char * const argv[],
419 bootm_headers_t *images)
421 /* No need for those on ARM */
422 if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
425 if (flag & BOOTM_STATE_OS_PREP) {
426 boot_prep_linux(images);
430 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
431 boot_jump_linux(images, flag);
435 boot_prep_linux(images);
436 boot_jump_linux(images, flag);
440 #if defined(CONFIG_BOOTM_VXWORKS)
441 void boot_prep_vxworks(bootm_headers_t *images)
443 #if defined(CONFIG_OF_LIBFDT)
446 if (images->ft_addr) {
447 off = fdt_path_offset(images->ft_addr, "/memory");
449 if (arch_fixup_fdt(images->ft_addr))
450 puts("## WARNING: fixup memory failed!\n");
454 cleanup_before_linux();
456 void boot_jump_vxworks(bootm_headers_t *images)
458 #if defined(CONFIG_ARM64) && defined(CONFIG_ARMV8_PSCI)
463 /* ARM VxWorks requires device tree physical address to be passed */
464 ((void (*)(void *))images->ep)(images->ft_addr);