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)
20 #include <u-boot/zlib.h>
21 #include <asm/byteorder.h>
22 #include <linux/libfdt.h>
24 #include <fdt_support.h>
25 #include <asm/bootm.h>
26 #include <asm/secure.h>
27 #include <linux/compiler.h>
31 #ifdef CONFIG_ARMV7_NONSEC
32 #include <asm/armv7.h>
34 #include <asm/setup.h>
36 DECLARE_GLOBAL_DATA_PTR;
38 static struct tag *params;
40 static ulong get_sp(void)
44 asm("mov %0, sp" : "=r"(ret) : );
48 void arch_lmb_reserve(struct lmb *lmb)
54 * Booting a (Linux) kernel image
56 * Allocate space for command line and board info - the
57 * address should be as high as possible within the reach of
58 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
59 * memory, which means far enough below the current stack
63 debug("## Current stack ends at 0x%08lx ", sp);
65 /* adjust sp by 4K to be safe */
67 for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
68 if (!gd->bd->bi_dram[bank].size ||
69 sp < gd->bd->bi_dram[bank].start)
71 /* Watch out for RAM at end of address space! */
72 bank_end = gd->bd->bi_dram[bank].start +
73 gd->bd->bi_dram[bank].size - 1;
76 lmb_reserve(lmb, sp, bank_end - sp + 1);
81 __weak void board_quiesce_devices(void)
86 * announce_and_cleanup() - Print message and prepare for kernel boot
88 * @fake: non-zero to do everything except actually boot
90 static void announce_and_cleanup(int fake)
92 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
93 #ifdef CONFIG_BOOTSTAGE_FDT
94 bootstage_fdt_add_report();
96 #ifdef CONFIG_BOOTSTAGE_REPORT
100 #ifdef CONFIG_USB_DEVICE
104 board_quiesce_devices();
106 printf("\nStarting kernel ...%s\n\n", fake ?
107 "(fake run for tracing)" : "");
109 * Call remove function of all devices with a removal flag set.
110 * This may be useful for last-stage operations, like cancelling
111 * of DMA operation or releasing device internal buffers.
113 dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);
115 cleanup_before_linux();
118 static void setup_start_tag (bd_t *bd)
120 params = (struct tag *)bd->bi_boot_params;
122 params->hdr.tag = ATAG_CORE;
123 params->hdr.size = tag_size (tag_core);
125 params->u.core.flags = 0;
126 params->u.core.pagesize = 0;
127 params->u.core.rootdev = 0;
129 params = tag_next (params);
132 static void setup_memory_tags(bd_t *bd)
136 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
137 params->hdr.tag = ATAG_MEM;
138 params->hdr.size = tag_size (tag_mem32);
140 params->u.mem.start = bd->bi_dram[i].start;
141 params->u.mem.size = bd->bi_dram[i].size;
143 params = tag_next (params);
147 static void setup_commandline_tag(bd_t *bd, char *commandline)
154 /* eat leading white space */
155 for (p = commandline; *p == ' '; p++);
157 /* skip non-existent command lines so the kernel will still
158 * use its default command line.
163 params->hdr.tag = ATAG_CMDLINE;
165 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
167 strcpy (params->u.cmdline.cmdline, p);
169 params = tag_next (params);
172 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
174 /* an ATAG_INITRD node tells the kernel where the compressed
175 * ramdisk can be found. ATAG_RDIMG is a better name, actually.
177 params->hdr.tag = ATAG_INITRD2;
178 params->hdr.size = tag_size (tag_initrd);
180 params->u.initrd.start = initrd_start;
181 params->u.initrd.size = initrd_end - initrd_start;
183 params = tag_next (params);
186 static void setup_serial_tag(struct tag **tmp)
188 struct tag *params = *tmp;
189 struct tag_serialnr serialnr;
191 get_board_serial(&serialnr);
192 params->hdr.tag = ATAG_SERIAL;
193 params->hdr.size = tag_size (tag_serialnr);
194 params->u.serialnr.low = serialnr.low;
195 params->u.serialnr.high= serialnr.high;
196 params = tag_next (params);
200 static void setup_revision_tag(struct tag **in_params)
204 rev = get_board_rev();
205 params->hdr.tag = ATAG_REVISION;
206 params->hdr.size = tag_size (tag_revision);
207 params->u.revision.rev = rev;
208 params = tag_next (params);
211 static void setup_end_tag(bd_t *bd)
213 params->hdr.tag = ATAG_NONE;
214 params->hdr.size = 0;
217 __weak void setup_board_tags(struct tag **in_params) {}
220 static void do_nonsec_virt_switch(void)
223 dcache_disable(); /* flush cache before swtiching to EL2 */
227 __weak void board_prep_linux(bootm_headers_t *images) { }
229 /* Subcommand: PREP */
230 static void boot_prep_linux(bootm_headers_t *images)
232 char *commandline = env_get("bootargs");
234 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
235 #ifdef CONFIG_OF_LIBFDT
236 debug("using: FDT\n");
237 if (image_setup_linux(images)) {
238 printf("FDT creation failed! hanging...");
242 } else if (BOOTM_ENABLE_TAGS) {
243 debug("using: ATAGS\n");
244 setup_start_tag(gd->bd);
245 if (BOOTM_ENABLE_SERIAL_TAG)
246 setup_serial_tag(¶ms);
247 if (BOOTM_ENABLE_CMDLINE_TAG)
248 setup_commandline_tag(gd->bd, commandline);
249 if (BOOTM_ENABLE_REVISION_TAG)
250 setup_revision_tag(¶ms);
251 if (BOOTM_ENABLE_MEMORY_TAGS)
252 setup_memory_tags(gd->bd);
253 if (BOOTM_ENABLE_INITRD_TAG) {
255 * In boot_ramdisk_high(), it may relocate ramdisk to
256 * a specified location. And set images->initrd_start &
257 * images->initrd_end to relocated ramdisk's start/end
258 * addresses. So use them instead of images->rd_start &
259 * images->rd_end when possible.
261 if (images->initrd_start && images->initrd_end) {
262 setup_initrd_tag(gd->bd, images->initrd_start,
264 } else if (images->rd_start && images->rd_end) {
265 setup_initrd_tag(gd->bd, images->rd_start,
269 setup_board_tags(¶ms);
270 setup_end_tag(gd->bd);
272 printf("FDT and ATAGS support not compiled in - hanging\n");
276 board_prep_linux(images);
279 __weak bool armv7_boot_nonsec_default(void)
281 #ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT
288 #ifdef CONFIG_ARMV7_NONSEC
289 bool armv7_boot_nonsec(void)
291 char *s = env_get("bootm_boot_mode");
292 bool nonsec = armv7_boot_nonsec_default();
294 if (s && !strcmp(s, "sec"))
297 if (s && !strcmp(s, "nonsec"))
305 __weak void update_os_arch_secondary_cores(uint8_t os_arch)
309 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
310 static void switch_to_el1(void)
312 if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
313 (images.os.arch == IH_ARCH_ARM))
314 armv8_switch_to_el1(0, (u64)gd->bd->bi_arch_number,
315 (u64)images.ft_addr, 0,
319 armv8_switch_to_el1((u64)images.ft_addr, 0, 0, 0,
327 static void boot_jump_linux(bootm_headers_t *images, int flag)
330 void (*kernel_entry)(void *fdt_addr, void *res0, void *res1,
332 int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
334 kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1,
335 void *res2))images->ep;
337 debug("## Transferring control to Linux (at address %lx)...\n",
338 (ulong) kernel_entry);
339 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
341 announce_and_cleanup(fake);
344 #ifdef CONFIG_ARMV8_PSCI
347 do_nonsec_virt_switch();
349 update_os_arch_secondary_cores(images->os.arch);
351 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
352 armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
353 (u64)switch_to_el1, ES_TO_AARCH64);
355 if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
356 (images->os.arch == IH_ARCH_ARM))
357 armv8_switch_to_el2(0, (u64)gd->bd->bi_arch_number,
358 (u64)images->ft_addr, 0,
362 armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
368 unsigned long machid = gd->bd->bi_arch_number;
370 void (*kernel_entry)(int zero, int arch, uint params);
372 int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
374 kernel_entry = (void (*)(int, int, uint))images->ep;
375 #ifdef CONFIG_CPU_V7M
376 ulong addr = (ulong)kernel_entry | 1;
377 kernel_entry = (void *)addr;
379 s = env_get("machid");
381 if (strict_strtoul(s, 16, &machid) < 0) {
382 debug("strict_strtoul failed!\n");
385 printf("Using machid 0x%lx from environment\n", machid);
388 debug("## Transferring control to Linux (at address %08lx)" \
389 "...\n", (ulong) kernel_entry);
390 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
391 announce_and_cleanup(fake);
393 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
394 r2 = (unsigned long)images->ft_addr;
396 r2 = gd->bd->bi_boot_params;
399 #ifdef CONFIG_ARMV7_NONSEC
400 if (armv7_boot_nonsec()) {
402 secure_ram_addr(_do_nonsec_entry)(kernel_entry,
406 kernel_entry(0, machid, r2);
411 /* Main Entry point for arm bootm implementation
413 * Modeled after the powerpc implementation
414 * DIFFERENCE: Instead of calling prep and go at the end
415 * they are called if subcommand is equal 0.
417 int do_bootm_linux(int flag, int argc, char * const argv[],
418 bootm_headers_t *images)
420 /* No need for those on ARM */
421 if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
424 if (flag & BOOTM_STATE_OS_PREP) {
425 boot_prep_linux(images);
429 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
430 boot_jump_linux(images, flag);
434 boot_prep_linux(images);
435 boot_jump_linux(images, flag);
439 #if defined(CONFIG_BOOTM_VXWORKS)
440 void boot_prep_vxworks(bootm_headers_t *images)
442 #if defined(CONFIG_OF_LIBFDT)
445 if (images->ft_addr) {
446 off = fdt_path_offset(images->ft_addr, "/memory");
448 if (arch_fixup_fdt(images->ft_addr))
449 puts("## WARNING: fixup memory failed!\n");
453 cleanup_before_linux();
455 void boot_jump_vxworks(bootm_headers_t *images)
457 #if defined(CONFIG_ARM64) && defined(CONFIG_ARMV8_PSCI)
462 /* ARM VxWorks requires device tree physical address to be passed */
463 ((void (*)(void *))images->ep)(images->ft_addr);