2 * Early boot support code for BootX bootloader
4 * Copyright (C) 2005 Ben. Herrenschmidt (benh@kernel.crashing.org)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/kernel.h>
13 #include <linux/string.h>
14 #include <linux/init.h>
15 #include <linux/version.h>
16 #include <asm/sections.h>
19 #include <asm/bootx.h>
20 #include <asm/bootinfo.h>
21 #include <asm/btext.h>
28 #define DBG(fmt...) do { bootx_printf(fmt); } while(0)
30 #define DBG(fmt...) do { } while(0)
33 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);
35 static unsigned long __initdata bootx_dt_strbase;
36 static unsigned long __initdata bootx_dt_strend;
37 static unsigned long __initdata bootx_node_chosen;
38 static boot_infos_t * __initdata bootx_info;
39 static char __initdata bootx_disp_path[256];
41 /* Is boot-info compatible ? */
42 #define BOOT_INFO_IS_COMPATIBLE(bi) \
43 ((bi)->compatible_version <= BOOT_INFO_VERSION)
44 #define BOOT_INFO_IS_V2_COMPATIBLE(bi) ((bi)->version >= 2)
45 #define BOOT_INFO_IS_V4_COMPATIBLE(bi) ((bi)->version >= 4)
47 #ifdef CONFIG_BOOTX_TEXT
48 static void __init bootx_printf(const char *format, ...)
50 const char *p, *q, *s;
54 va_start(args, format);
55 for (p = format; *p != 0; p = q) {
56 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
59 btext_drawtext(p, q - p);
65 btext_drawstring("\r\n");
75 s = va_arg(args, const char *);
82 v = va_arg(args, unsigned long);
88 #else /* CONFIG_BOOTX_TEXT */
89 static void __init bootx_printf(const char *format, ...) {}
90 #endif /* CONFIG_BOOTX_TEXT */
92 static void * __init bootx_early_getprop(unsigned long base,
96 struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
97 u32 *ppp = &np->properties;
100 struct bootx_dt_prop *pp =
101 (struct bootx_dt_prop *)(base + *ppp);
103 if (strcmp((char *)((unsigned long)pp->name + base),
105 return (void *)((unsigned long)pp->value + base);
112 #define dt_push_token(token, mem) \
114 *(mem) = _ALIGN_UP(*(mem),4); \
115 *((u32 *)*(mem)) = token; \
119 static unsigned long __init bootx_dt_find_string(char *str)
123 s = os = (char *)bootx_dt_strbase;
125 while (s < (char *)bootx_dt_strend) {
126 if (strcmp(s, str) == 0)
133 static void __init bootx_dt_add_prop(char *name, void *data, int size,
134 unsigned long *mem_end)
136 unsigned long soff = bootx_dt_find_string(name);
140 bootx_printf("WARNING: Can't find string index for <%s>\n",
144 if (size > 0x20000) {
145 bootx_printf("WARNING: ignoring large property ");
146 bootx_printf("%s length 0x%x\n", name, size);
149 dt_push_token(OF_DT_PROP, mem_end);
150 dt_push_token(size, mem_end);
151 dt_push_token(soff, mem_end);
153 /* push property content */
155 memcpy((void *)*mem_end, data, size);
156 *mem_end = _ALIGN_UP(*mem_end + size, 4);
160 static void __init bootx_add_chosen_props(unsigned long base,
161 unsigned long *mem_end)
165 if (bootx_info->kernelParamsOffset) {
166 char *args = (char *)((unsigned long)bootx_info) +
167 bootx_info->kernelParamsOffset;
168 bootx_dt_add_prop("bootargs", args, strlen(args) + 1, mem_end);
170 if (bootx_info->ramDisk) {
171 val = ((unsigned long)bootx_info) + bootx_info->ramDisk;
172 bootx_dt_add_prop("linux,initrd-start", &val, 4, mem_end);
173 val += bootx_info->ramDiskSize;
174 bootx_dt_add_prop("linux,initrd-end", &val, 4, mem_end);
176 if (strlen(bootx_disp_path))
177 bootx_dt_add_prop("linux,stdout-path", bootx_disp_path,
178 strlen(bootx_disp_path) + 1, mem_end);
181 static void __init bootx_add_display_props(unsigned long base,
182 unsigned long *mem_end)
184 bootx_dt_add_prop("linux,boot-display", NULL, 0, mem_end);
185 bootx_dt_add_prop("linux,opened", NULL, 0, mem_end);
188 static void __init bootx_dt_add_string(char *s, unsigned long *mem_end)
190 unsigned int l = strlen(s) + 1;
191 memcpy((void *)*mem_end, s, l);
192 bootx_dt_strend = *mem_end = *mem_end + l;
195 static void __init bootx_scan_dt_build_strings(unsigned long base,
197 unsigned long *mem_end)
199 struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
200 u32 *cpp, *ppp = &np->properties;
204 /* Keep refs to known nodes */
205 namep = np->full_name ? (char *)(base + np->full_name) : NULL;
207 bootx_printf("Node without a full name !\n");
210 DBG("* strings: %s\n", namep);
212 if (!strcmp(namep, "/chosen")) {
213 DBG(" detected /chosen ! adding properties names !\n");
214 bootx_dt_add_string("linux,platform", mem_end);
215 bootx_dt_add_string("linux,stdout-path", mem_end);
216 bootx_dt_add_string("linux,initrd-start", mem_end);
217 bootx_dt_add_string("linux,initrd-end", mem_end);
218 bootx_dt_add_string("bootargs", mem_end);
219 bootx_node_chosen = node;
221 if (node == bootx_info->dispDeviceRegEntryOffset) {
222 DBG(" detected display ! adding properties names !\n");
223 bootx_dt_add_string("linux,boot-display", mem_end);
224 bootx_dt_add_string("linux,opened", mem_end);
225 strncpy(bootx_disp_path, namep, 255);
228 /* get and store all property names */
230 struct bootx_dt_prop *pp =
231 (struct bootx_dt_prop *)(base + *ppp);
233 namep = pp->name ? (char *)(base + pp->name) : NULL;
234 if (namep == NULL || strcmp(namep, "name") == 0)
236 /* get/create string entry */
237 soff = bootx_dt_find_string(namep);
239 bootx_dt_add_string(namep, mem_end);
244 /* do all our children */
247 np = (struct bootx_dt_node *)(base + *cpp);
248 bootx_scan_dt_build_strings(base, *cpp, mem_end);
253 static void __init bootx_scan_dt_build_struct(unsigned long base,
255 unsigned long *mem_end)
257 struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
258 u32 *cpp, *ppp = &np->properties;
259 char *namep, *p, *ep, *lp;
262 dt_push_token(OF_DT_BEGIN_NODE, mem_end);
264 /* get the node's full name */
265 namep = np->full_name ? (char *)(base + np->full_name) : NULL;
270 DBG("* struct: %s\n", namep);
272 /* Fixup an Apple bug where they have bogus \0 chars in the
273 * middle of the path in some properties, and extract
274 * the unit name (everything after the last '/').
276 memcpy((void *)*mem_end, namep, l + 1);
277 namep = (char *)*mem_end;
278 for (lp = p = namep, ep = namep + l; p < ep; p++) {
285 *mem_end = _ALIGN_UP((unsigned long)lp + 1, 4);
287 /* get and store all properties */
289 struct bootx_dt_prop *pp =
290 (struct bootx_dt_prop *)(base + *ppp);
292 namep = pp->name ? (char *)(base + pp->name) : NULL;
294 if (namep == NULL || !strcmp(namep, "name"))
296 /* Skip "bootargs" in /chosen too as we replace it */
297 if (node == bootx_node_chosen && !strcmp(namep, "bootargs"))
300 /* push property head */
301 bootx_dt_add_prop(namep,
302 pp->value ? (void *)(base + pp->value): NULL,
303 pp->length, mem_end);
308 if (node == bootx_node_chosen)
309 bootx_add_chosen_props(base, mem_end);
310 if (node == bootx_info->dispDeviceRegEntryOffset)
311 bootx_add_display_props(base, mem_end);
313 /* do all our children */
316 np = (struct bootx_dt_node *)(base + *cpp);
317 bootx_scan_dt_build_struct(base, *cpp, mem_end);
321 dt_push_token(OF_DT_END_NODE, mem_end);
324 static unsigned long __init bootx_flatten_dt(unsigned long start)
326 boot_infos_t *bi = bootx_info;
327 unsigned long mem_start, mem_end;
328 struct boot_param_header *hdr;
332 /* Start using memory after the big blob passed by BootX, get
333 * some space for the header
335 mem_start = mem_end = _ALIGN_UP(((unsigned long)bi) + start, 4);
336 DBG("Boot params header at: %x\n", mem_start);
337 hdr = (struct boot_param_header *)mem_start;
338 mem_end += sizeof(struct boot_param_header);
339 rsvmap = (u64 *)(_ALIGN_UP(mem_end, 8));
340 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - mem_start;
341 mem_end = ((unsigned long)rsvmap) + 8 * sizeof(u64);
343 /* Get base of tree */
344 base = ((unsigned long)bi) + bi->deviceTreeOffset;
346 /* Build string array */
347 DBG("Building string array at: %x\n", mem_end);
348 DBG("Device Tree Base=%x\n", base);
349 bootx_dt_strbase = mem_end;
351 bootx_dt_strend = mem_end;
352 bootx_scan_dt_build_strings(base, 4, &mem_end);
353 hdr->off_dt_strings = bootx_dt_strbase - mem_start;
354 hdr->dt_strings_size = bootx_dt_strend - bootx_dt_strbase;
356 /* Build structure */
357 mem_end = _ALIGN(mem_end, 16);
358 DBG("Building device tree structure at: %x\n", mem_end);
359 hdr->off_dt_struct = mem_end - mem_start;
360 bootx_scan_dt_build_struct(base, 4, &mem_end);
361 dt_push_token(OF_DT_END, &mem_end);
364 hdr->boot_cpuid_phys = 0;
365 hdr->magic = OF_DT_HEADER;
366 hdr->totalsize = mem_end - mem_start;
367 hdr->version = OF_DT_VERSION;
368 /* Version 16 is not backward compatible */
369 hdr->last_comp_version = 0x10;
371 /* Reserve the whole thing and copy the reserve map in, we
372 * also bump mem_reserve_cnt to cause further reservations to
373 * fail since it's too late.
375 mem_end = _ALIGN(mem_end, PAGE_SIZE);
376 DBG("End of boot params: %x\n", mem_end);
377 rsvmap[0] = mem_start;
382 return (unsigned long)hdr;
386 #ifdef CONFIG_BOOTX_TEXT
387 static void __init btext_welcome(boot_infos_t *bi)
392 bootx_printf("Welcome to Linux, kernel " UTS_RELEASE "\n");
393 bootx_printf("\nlinked at : 0x%x", KERNELBASE);
394 bootx_printf("\nframe buffer at : 0x%x", bi->dispDeviceBase);
395 bootx_printf(" (phys), 0x%x", bi->logicalDisplayBase);
396 bootx_printf(" (log)");
397 bootx_printf("\nklimit : 0x%x",(unsigned long)klimit);
398 bootx_printf("\nboot_info at : 0x%x", bi);
399 __asm__ __volatile__ ("mfmsr %0" : "=r" (flags));
400 bootx_printf("\nMSR : 0x%x", flags);
401 __asm__ __volatile__ ("mfspr %0, 287" : "=r" (pvr));
402 bootx_printf("\nPVR : 0x%x", pvr);
405 __asm__ __volatile__ ("mfspr %0, 1008" : "=r" (flags));
406 bootx_printf("\nHID0 : 0x%x", flags);
408 if (pvr == 8 || pvr == 12 || pvr == 0x800c) {
409 __asm__ __volatile__ ("mfspr %0, 1019" : "=r" (flags));
410 bootx_printf("\nICTC : 0x%x", flags);
413 bootx_printf("\n\n");
414 bootx_printf("bi->deviceTreeOffset : 0x%x\n",
415 bi->deviceTreeOffset);
416 bootx_printf("bi->deviceTreeSize : 0x%x\n",
419 bootx_printf("\n\n");
421 #endif /* CONFIG_BOOTX_TEXT */
423 void __init bootx_init(unsigned long r3, unsigned long r4)
425 boot_infos_t *bi = (boot_infos_t *) r4;
428 unsigned long ptr, x;
430 unsigned long offset = reloc_offset();
436 /* We haven't cleared any bss at this point, make sure
437 * what we need is initialized
439 bootx_dt_strbase = bootx_dt_strend = 0;
440 bootx_node_chosen = 0;
441 bootx_disp_path[0] = 0;
443 if (!BOOT_INFO_IS_V2_COMPATIBLE(bi))
444 bi->logicalDisplayBase = bi->dispDeviceBase;
446 #ifdef CONFIG_BOOTX_TEXT
447 btext_setup_display(bi->dispDeviceRect[2] - bi->dispDeviceRect[0],
448 bi->dispDeviceRect[3] - bi->dispDeviceRect[1],
449 bi->dispDeviceDepth, bi->dispDeviceRowBytes,
450 (unsigned long)bi->logicalDisplayBase);
453 #endif /* CONFIG_BOOTX_TEXT */
456 * Test if boot-info is compatible. Done only in config
457 * CONFIG_BOOTX_TEXT since there is nothing much we can do
458 * with an incompatible version, except display a message
459 * and eventually hang the processor...
461 * I'll try to keep enough of boot-info compatible in the
462 * future to always allow display of this message;
464 if (!BOOT_INFO_IS_COMPATIBLE(bi)) {
465 bootx_printf(" !!! WARNING - Incompatible version"
466 " of BootX !!!\n\n\n");
470 if (bi->architecture != BOOT_ARCH_PCI) {
471 bootx_printf(" !!! WARNING - Usupported machine"
472 " architecture !\n");
477 #ifdef CONFIG_BOOTX_TEXT
480 /* New BootX enters kernel with MMU off, i/os are not allowed
481 * here. This hack will have been done by the boostrap anyway.
483 if (bi->version < 4) {
485 * XXX If this is an iMac, turn off the USB controller.
487 model = (char *) bootx_early_getprop(r4 + bi->deviceTreeOffset,
490 && (strcmp(model, "iMac,1") == 0
491 || strcmp(model, "PowerMac1,1") == 0)) {
492 bootx_printf("iMac,1 detected, shutting down USB \n");
493 out_le32((unsigned __iomem *)0x80880008, 1); /* XXX */
497 /* Get a pointer that points above the device tree, args, ramdisk,
498 * etc... to use for generating the flattened tree
500 if (bi->version < 5) {
501 space = bi->deviceTreeOffset + bi->deviceTreeSize;
503 space = bi->ramDisk + bi->ramDiskSize;
505 space = bi->totalParamsSize;
507 bootx_printf("Total space used by parameters & ramdisk: %x \n", space);
509 /* New BootX will have flushed all TLBs and enters kernel with
510 * MMU switched OFF, so this should not be useful anymore.
512 if (bi->version < 4) {
513 bootx_printf("Touching pages...\n");
516 * Touch each page to make sure the PTEs for them
517 * are in the hash table - the aim is to try to avoid
518 * getting DSI exceptions while copying the kernel image.
520 for (ptr = ((unsigned long) &_stext) & PAGE_MASK;
521 ptr < (unsigned long)bi + space; ptr += PAGE_SIZE)
522 x = *(volatile unsigned long *)ptr;
525 /* Ok, now we need to generate a flattened device-tree to pass
528 bootx_printf("Preparing boot params...\n");
530 hdr = bootx_flatten_dt(space);
532 #ifdef CONFIG_BOOTX_TEXT
534 bootx_printf("Preparing BAT...\n");
543 __start(hdr, KERNELBASE + offset, 0);