Merge branch 'master' of git://git.denx.de/u-boot-imx
[karo-tx-uboot.git] / arch / arm / lib / bootm.c
1 /* Copyright (C) 2011
2  * Corscience GmbH & Co. KG - Simon Schwarz <schwarz@corscience.de>
3  *  - Added prep subcommand support
4  *  - Reorganized source - modeled after powerpc version
5  *
6  * (C) Copyright 2002
7  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
8  * Marius Groeger <mgroeger@sysgo.de>
9  *
10  * Copyright (C) 2001  Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
11  *
12  * SPDX-License-Identifier:     GPL-2.0+
13  */
14
15 #include <common.h>
16 #include <command.h>
17 #include <image.h>
18 #include <vxworks.h>
19 #include <u-boot/zlib.h>
20 #include <asm/byteorder.h>
21 #include <libfdt.h>
22 #include <fdt_support.h>
23 #include <asm/bootm.h>
24 #include <asm/secure.h>
25 #include <linux/compiler.h>
26 #include <bootm.h>
27 #include <vxworks.h>
28
29 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
30 #include <asm/armv7.h>
31 #endif
32
33 DECLARE_GLOBAL_DATA_PTR;
34
35 static struct tag *params;
36
37 static ulong get_sp(void)
38 {
39         ulong ret;
40
41         asm("mov %0, sp" : "=r"(ret) : );
42         return ret;
43 }
44
45 void arch_lmb_reserve(struct lmb *lmb)
46 {
47         ulong sp;
48
49         /*
50          * Booting a (Linux) kernel image
51          *
52          * Allocate space for command line and board info - the
53          * address should be as high as possible within the reach of
54          * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
55          * memory, which means far enough below the current stack
56          * pointer.
57          */
58         sp = get_sp();
59         debug("## Current stack ends at 0x%08lx ", sp);
60
61         /* adjust sp by 4K to be safe */
62         sp -= 4096;
63         lmb_reserve(lmb, sp,
64                     gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp);
65 }
66
67 /**
68  * announce_and_cleanup() - Print message and prepare for kernel boot
69  *
70  * @fake: non-zero to do everything except actually boot
71  */
72 static void announce_and_cleanup(int fake)
73 {
74         printf("\nStarting kernel ...%s\n\n", fake ?
75                 "(fake run for tracing)" : "");
76         bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
77 #ifdef CONFIG_BOOTSTAGE_FDT
78         bootstage_fdt_add_report();
79 #endif
80 #ifdef CONFIG_BOOTSTAGE_REPORT
81         bootstage_report();
82 #endif
83
84 #ifdef CONFIG_USB_DEVICE
85         udc_disconnect();
86 #endif
87         cleanup_before_linux();
88 }
89
90 static void setup_start_tag (bd_t *bd)
91 {
92         params = (struct tag *)bd->bi_boot_params;
93
94         params->hdr.tag = ATAG_CORE;
95         params->hdr.size = tag_size (tag_core);
96
97         params->u.core.flags = 0;
98         params->u.core.pagesize = 0;
99         params->u.core.rootdev = 0;
100
101         params = tag_next (params);
102 }
103
104 static void setup_memory_tags(bd_t *bd)
105 {
106         int i;
107
108         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
109                 params->hdr.tag = ATAG_MEM;
110                 params->hdr.size = tag_size (tag_mem32);
111
112                 params->u.mem.start = bd->bi_dram[i].start;
113                 params->u.mem.size = bd->bi_dram[i].size;
114
115                 params = tag_next (params);
116         }
117 }
118
119 static void setup_commandline_tag(bd_t *bd, char *commandline)
120 {
121         char *p;
122
123         if (!commandline)
124                 return;
125
126         /* eat leading white space */
127         for (p = commandline; *p == ' '; p++);
128
129         /* skip non-existent command lines so the kernel will still
130          * use its default command line.
131          */
132         if (*p == '\0')
133                 return;
134
135         params->hdr.tag = ATAG_CMDLINE;
136         params->hdr.size =
137                 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
138
139         strcpy (params->u.cmdline.cmdline, p);
140
141         params = tag_next (params);
142 }
143
144 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
145 {
146         /* an ATAG_INITRD node tells the kernel where the compressed
147          * ramdisk can be found. ATAG_RDIMG is a better name, actually.
148          */
149         params->hdr.tag = ATAG_INITRD2;
150         params->hdr.size = tag_size (tag_initrd);
151
152         params->u.initrd.start = initrd_start;
153         params->u.initrd.size = initrd_end - initrd_start;
154
155         params = tag_next (params);
156 }
157
158 static void setup_serial_tag(struct tag **tmp)
159 {
160         struct tag *params = *tmp;
161         struct tag_serialnr serialnr;
162
163         get_board_serial(&serialnr);
164         params->hdr.tag = ATAG_SERIAL;
165         params->hdr.size = tag_size (tag_serialnr);
166         params->u.serialnr.low = serialnr.low;
167         params->u.serialnr.high= serialnr.high;
168         params = tag_next (params);
169         *tmp = params;
170 }
171
172 static void setup_revision_tag(struct tag **in_params)
173 {
174         u32 rev = 0;
175
176         rev = get_board_rev();
177         params->hdr.tag = ATAG_REVISION;
178         params->hdr.size = tag_size (tag_revision);
179         params->u.revision.rev = rev;
180         params = tag_next (params);
181 }
182
183 static void setup_end_tag(bd_t *bd)
184 {
185         params->hdr.tag = ATAG_NONE;
186         params->hdr.size = 0;
187 }
188
189 __weak void setup_board_tags(struct tag **in_params) {}
190
191 #ifdef CONFIG_ARM64
192 static void do_nonsec_virt_switch(void)
193 {
194         smp_kick_all_cpus();
195         flush_dcache_all();     /* flush cache before swtiching to EL2 */
196         armv8_switch_to_el2();
197 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
198         armv8_switch_to_el1();
199 #endif
200 }
201 #endif
202
203 /* Subcommand: PREP */
204 static void boot_prep_linux(bootm_headers_t *images)
205 {
206         char *commandline = getenv("bootargs");
207
208         if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
209 #ifdef CONFIG_OF_LIBFDT
210                 debug("using: FDT\n");
211                 if (image_setup_linux(images)) {
212                         printf("FDT creation failed! hanging...");
213                         hang();
214                 }
215 #endif
216         } else if (BOOTM_ENABLE_TAGS) {
217                 debug("using: ATAGS\n");
218                 setup_start_tag(gd->bd);
219                 if (BOOTM_ENABLE_SERIAL_TAG)
220                         setup_serial_tag(&params);
221                 if (BOOTM_ENABLE_CMDLINE_TAG)
222                         setup_commandline_tag(gd->bd, commandline);
223                 if (BOOTM_ENABLE_REVISION_TAG)
224                         setup_revision_tag(&params);
225                 if (BOOTM_ENABLE_MEMORY_TAGS)
226                         setup_memory_tags(gd->bd);
227                 if (BOOTM_ENABLE_INITRD_TAG) {
228                         if (images->rd_start && images->rd_end) {
229                                 setup_initrd_tag(gd->bd, images->rd_start,
230                                                  images->rd_end);
231                         }
232                 }
233                 setup_board_tags(&params);
234                 setup_end_tag(gd->bd);
235         } else {
236                 printf("FDT and ATAGS support not compiled in - hanging\n");
237                 hang();
238         }
239 }
240
241 /* Subcommand: GO */
242 static void boot_jump_linux(bootm_headers_t *images, int flag)
243 {
244 #ifdef CONFIG_ARM64
245         void (*kernel_entry)(void *fdt_addr, void *res0, void *res1,
246                         void *res2);
247         int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
248
249         kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1,
250                                 void *res2))images->ep;
251
252         debug("## Transferring control to Linux (at address %lx)...\n",
253                 (ulong) kernel_entry);
254         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
255
256         announce_and_cleanup(fake);
257
258         if (!fake) {
259                 do_nonsec_virt_switch();
260                 kernel_entry(images->ft_addr, NULL, NULL, NULL);
261         }
262 #else
263         unsigned long machid = gd->bd->bi_arch_number;
264         char *s;
265         void (*kernel_entry)(int zero, int arch, uint params);
266         unsigned long r2;
267         int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
268
269         kernel_entry = (void (*)(int, int, uint))images->ep;
270
271         s = getenv("machid");
272         if (s) {
273                 strict_strtoul(s, 16, &machid);
274                 printf("Using machid 0x%lx from environment\n", machid);
275         }
276
277         debug("## Transferring control to Linux (at address %08lx)" \
278                 "...\n", (ulong) kernel_entry);
279         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
280         announce_and_cleanup(fake);
281
282         if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
283                 r2 = (unsigned long)images->ft_addr;
284         else
285                 r2 = gd->bd->bi_boot_params;
286
287         if (!fake) {
288 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
289                 armv7_init_nonsec();
290                 secure_ram_addr(_do_nonsec_entry)(kernel_entry,
291                                                   0, machid, r2);
292 #else
293                 kernel_entry(0, machid, r2);
294 #endif
295         }
296 #endif
297 }
298
299 /* Main Entry point for arm bootm implementation
300  *
301  * Modeled after the powerpc implementation
302  * DIFFERENCE: Instead of calling prep and go at the end
303  * they are called if subcommand is equal 0.
304  */
305 int do_bootm_linux(int flag, int argc, char * const argv[],
306                    bootm_headers_t *images)
307 {
308         /* No need for those on ARM */
309         if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
310                 return -1;
311
312         if (flag & BOOTM_STATE_OS_PREP) {
313                 boot_prep_linux(images);
314                 return 0;
315         }
316
317         if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
318                 boot_jump_linux(images, flag);
319                 return 0;
320         }
321
322         boot_prep_linux(images);
323         boot_jump_linux(images, flag);
324         return 0;
325 }
326
327 #ifdef CONFIG_CMD_BOOTZ
328
329 struct zimage_header {
330         uint32_t        code[9];
331         uint32_t        zi_magic;
332         uint32_t        zi_start;
333         uint32_t        zi_end;
334 };
335
336 #define LINUX_ARM_ZIMAGE_MAGIC  0x016f2818
337
338 int bootz_setup(ulong image, ulong *start, ulong *end)
339 {
340         struct zimage_header *zi;
341
342         zi = (struct zimage_header *)map_sysmem(image, 0);
343         if (zi->zi_magic != LINUX_ARM_ZIMAGE_MAGIC) {
344                 puts("Bad Linux ARM zImage magic!\n");
345                 return 1;
346         }
347
348         *start = zi->zi_start;
349         *end = zi->zi_end;
350
351         printf("Kernel image @ %#08lx [ %#08lx - %#08lx ]\n", image, *start,
352               *end);
353
354         return 0;
355 }
356
357 #endif  /* CONFIG_CMD_BOOTZ */
358
359 #if defined(CONFIG_BOOTM_VXWORKS)
360 void boot_prep_vxworks(bootm_headers_t *images)
361 {
362 #if defined(CONFIG_OF_LIBFDT)
363         int off;
364
365         if (images->ft_addr) {
366                 off = fdt_path_offset(images->ft_addr, "/memory");
367                 if (off < 0) {
368                         if (arch_fixup_fdt(images->ft_addr))
369                                 puts("## WARNING: fixup memory failed!\n");
370                 }
371         }
372 #endif
373         cleanup_before_linux();
374 }
375 void boot_jump_vxworks(bootm_headers_t *images)
376 {
377         /* ARM VxWorks requires device tree physical address to be passed */
378         ((void (*)(void *))images->ep)(images->ft_addr);
379 }
380 #endif