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