4 * Procedures for interfacing to Open Firmware.
6 * Paul Mackerras August 1996.
7 * Copyright (C) 1996 Paul Mackerras.
9 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
10 * {engebret|bergner}@us.ibm.com
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
21 #include <linux/config.h>
22 #include <linux/kernel.h>
23 #include <linux/string.h>
24 #include <linux/init.h>
25 #include <linux/version.h>
26 #include <linux/threads.h>
27 #include <linux/spinlock.h>
28 #include <linux/types.h>
29 #include <linux/pci.h>
30 #include <linux/proc_fs.h>
31 #include <linux/stringify.h>
32 #include <linux/delay.h>
33 #include <linux/initrd.h>
36 #include <asm/abs_addr.h>
38 #include <asm/processor.h>
42 #include <asm/system.h>
44 #include <asm/pgtable.h>
45 #include <asm/bitops.h>
48 #include <asm/iommu.h>
49 #include <asm/bootinfo.h>
50 #include <asm/ppcdebug.h>
51 #include <asm/btext.h>
52 #include <asm/sections.h>
53 #include <asm/machdep.h>
56 #ifdef CONFIG_LOGO_LINUX_CLUT224
57 #include <linux/linux_logo.h>
58 extern const struct linux_logo logo_linux_clut224;
62 * Properties whose value is longer than this get excluded from our
63 * copy of the device tree. This value does need to be big enough to
64 * ensure that we don't lose things like the interrupt-map property
65 * on a PCI-PCI bridge.
67 #define MAX_PROPERTY_LENGTH (1UL * 1024 * 1024)
70 * Eventually bump that one up
72 #define DEVTREE_CHUNK_SIZE 0x100000
75 * This is the size of the local memory reserve map that gets copied
76 * into the boot params passed to the kernel. That size is totally
77 * flexible as the kernel just reads the list until it encounters an
78 * entry with size 0, so it can be changed without breaking binary
81 #define MEM_RESERVE_MAP_SIZE 8
84 * prom_init() is called very early on, before the kernel text
85 * and data have been mapped to KERNELBASE. At this point the code
86 * is running at whatever address it has been loaded at, so
87 * references to extern and static variables must be relocated
88 * explicitly. The procedure reloc_offset() returns the address
89 * we're currently running at minus the address we were linked at.
90 * (Note that strings count as static variables.)
92 * Because OF may have mapped I/O devices into the area starting at
93 * KERNELBASE, particularly on CHRP machines, we can't safely call
94 * OF once the kernel has been mapped to KERNELBASE. Therefore all
95 * OF calls should be done within prom_init(), and prom_init()
96 * and all routines called within it must be careful to relocate
97 * references as necessary.
99 * Note that the bss is cleared *after* prom_init runs, so we have
100 * to make sure that any static or extern variables it accesses
101 * are put in the data segment.
105 #define PROM_BUG() do { \
106 prom_printf("kernel BUG at %s line 0x%x!\n", \
107 RELOC(__FILE__), __LINE__); \
108 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
112 #define prom_debug(x...) prom_printf(x)
114 #define prom_debug(x...)
118 typedef u32 prom_arg_t;
125 prom_arg_t *rets; /* Pointer to return values in args[16]. */
135 struct prom_args args;
136 unsigned long version;
137 unsigned long root_size_cells;
138 unsigned long root_addr_cells;
141 struct pci_reg_property {
142 struct pci_address addr;
147 struct mem_map_entry {
154 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);
156 extern unsigned long reloc_offset(void);
157 extern void enter_prom(struct prom_args *args, unsigned long entry);
158 extern void copy_and_flush(unsigned long dest, unsigned long src,
159 unsigned long size, unsigned long offset);
161 extern unsigned long klimit;
163 //int global_width = 640, global_height = 480, global_depth = 8, global_pitch;
164 //unsigned global_address;
166 static struct prom_t __initdata prom;
168 #define PROM_SCRATCH_SIZE 256
170 static char __initdata of_stdout_device[256];
171 static char __initdata prom_scratch[PROM_SCRATCH_SIZE];
173 static unsigned long __initdata dt_header_start;
174 static unsigned long __initdata dt_struct_start, dt_struct_end;
175 static unsigned long __initdata dt_string_start, dt_string_end;
177 static unsigned long __initdata prom_initrd_start, prom_initrd_end;
179 static int __initdata iommu_force_on;
180 static int __initdata ppc64_iommu_off;
181 static int __initdata of_platform;
183 static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];
185 static unsigned long __initdata alloc_top;
186 static unsigned long __initdata alloc_top_high;
187 static unsigned long __initdata alloc_bottom;
188 static unsigned long __initdata rmo_top;
189 static unsigned long __initdata ram_top;
191 static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
192 static int __initdata mem_reserve_cnt;
194 static cell_t __initdata regbuf[1024];
197 #define MAX_CPU_THREADS 2
203 unsigned int threadid;
204 } hmt_thread_data[NR_CPUS];
205 #endif /* CONFIG_HMT */
208 * This are used in calls to call_prom. The 4th and following
209 * arguments to call_prom should be 32-bit values. 64 bit values
210 * are truncated to 32 bits (and fortunately don't get interpreted
213 #define ADDR(x) (u32) ((unsigned long)(x) - offset)
215 /* This is the one and *ONLY* place where we actually call open
216 * firmware from, since we need to make sure we're running in 32b
217 * mode when we do. We switch back to 64b mode upon return.
220 #define PROM_ERROR (-1)
222 static int __init call_prom(const char *service, int nargs, int nret, ...)
225 unsigned long offset = reloc_offset();
226 struct prom_t *_prom = PTRRELOC(&prom);
229 _prom->args.service = ADDR(service);
230 _prom->args.nargs = nargs;
231 _prom->args.nret = nret;
232 _prom->args.rets = (prom_arg_t *)&(_prom->args.args[nargs]);
234 va_start(list, nret);
235 for (i=0; i < nargs; i++)
236 _prom->args.args[i] = va_arg(list, prom_arg_t);
239 for (i=0; i < nret ;i++)
240 _prom->args.rets[i] = 0;
242 enter_prom(&_prom->args, _prom->entry);
244 return (nret > 0) ? _prom->args.rets[0] : 0;
248 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
251 return (unsigned int)call_prom("claim", 3, 1,
252 (prom_arg_t)virt, (prom_arg_t)size,
256 static void __init prom_print(const char *msg)
259 unsigned long offset = reloc_offset();
260 struct prom_t *_prom = PTRRELOC(&prom);
262 if (_prom->stdout == 0)
265 for (p = msg; *p != 0; p = q) {
266 for (q = p; *q != 0 && *q != '\n'; ++q)
269 call_prom("write", 3, 1, _prom->stdout, p, q - p);
273 call_prom("write", 3, 1, _prom->stdout, ADDR("\r\n"), 2);
278 static void __init prom_print_hex(unsigned long val)
280 unsigned long offset = reloc_offset();
281 int i, nibbles = sizeof(val)*2;
282 char buf[sizeof(val)*2+1];
283 struct prom_t *_prom = PTRRELOC(&prom);
285 for (i = nibbles-1; i >= 0; i--) {
286 buf[i] = (val & 0xf) + '0';
288 buf[i] += ('a'-'0'-10);
292 call_prom("write", 3, 1, _prom->stdout, buf, nibbles);
296 static void __init prom_printf(const char *format, ...)
298 unsigned long offset = reloc_offset();
299 const char *p, *q, *s;
302 struct prom_t *_prom = PTRRELOC(&prom);
304 va_start(args, format);
305 for (p = PTRRELOC(format); *p != 0; p = q) {
306 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
309 call_prom("write", 3, 1, _prom->stdout, p, q - p);
314 call_prom("write", 3, 1, _prom->stdout,
324 s = va_arg(args, const char *);
329 v = va_arg(args, unsigned long);
337 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
339 unsigned long offset = reloc_offset();
341 prom_print(PTRRELOC(reason));
342 /* ToDo: should put up an SRC here */
343 call_prom("exit", 0, 0);
345 for (;;) /* should never get here */
350 static int __init prom_next_node(phandle *nodep)
354 if ((node = *nodep) != 0
355 && (*nodep = call_prom("child", 1, 1, node)) != 0)
357 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
360 if ((node = call_prom("parent", 1, 1, node)) == 0)
362 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
367 static int __init prom_getprop(phandle node, const char *pname,
368 void *value, size_t valuelen)
370 unsigned long offset = reloc_offset();
372 return call_prom("getprop", 4, 1, node, ADDR(pname),
373 (u32)(unsigned long) value, (u32) valuelen);
376 static int __init prom_getproplen(phandle node, const char *pname)
378 unsigned long offset = reloc_offset();
380 return call_prom("getproplen", 2, 1, node, ADDR(pname));
383 static int __init prom_setprop(phandle node, const char *pname,
384 void *value, size_t valuelen)
386 unsigned long offset = reloc_offset();
388 return call_prom("setprop", 4, 1, node, ADDR(pname),
389 (u32)(unsigned long) value, (u32) valuelen);
394 * Early parsing of the command line passed to the kernel, used for
395 * the options that affect the iommu
397 static void __init early_cmdline_parse(void)
399 unsigned long offset = reloc_offset();
400 struct prom_t *_prom = PTRRELOC(&prom);
404 RELOC(prom_cmd_line[0]) = 0;
405 p = RELOC(prom_cmd_line);
406 if ((long)_prom->chosen > 0)
407 l = prom_getprop(_prom->chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
408 #ifdef CONFIG_CMDLINE
409 if (l == 0) /* dbl check */
410 strlcpy(RELOC(prom_cmd_line),
411 RELOC(CONFIG_CMDLINE), sizeof(prom_cmd_line));
412 #endif /* CONFIG_CMDLINE */
413 prom_printf("command line: %s\n", RELOC(prom_cmd_line));
415 opt = strstr(RELOC(prom_cmd_line), RELOC("iommu="));
417 prom_printf("iommu opt is: %s\n", opt);
419 while (*opt && *opt == ' ')
421 if (!strncmp(opt, RELOC("off"), 3))
422 RELOC(ppc64_iommu_off) = 1;
423 else if (!strncmp(opt, RELOC("force"), 5))
424 RELOC(iommu_force_on) = 1;
429 * Memory allocation strategy... our layout is normally:
431 * at 14Mb or more we vmlinux, then a gap and initrd. In some rare cases, initrd
432 * might end up beeing before the kernel though. We assume this won't override
433 * the final kernel at 0, we have no provision to handle that in this version,
434 * but it should hopefully never happen.
436 * alloc_top is set to the top of RMO, eventually shrink down if the TCEs overlap
437 * alloc_bottom is set to the top of kernel/initrd
439 * from there, allocations are done that way : rtas is allocated topmost, and
440 * the device-tree is allocated from the bottom. We try to grow the device-tree
441 * allocation as we progress. If we can't, then we fail, we don't currently have
442 * a facility to restart elsewhere, but that shouldn't be necessary neither
444 * Note that calls to reserve_mem have to be done explicitely, memory allocated
445 * with either alloc_up or alloc_down isn't automatically reserved.
450 * Allocates memory in the RMO upward from the kernel/initrd
452 * When align is 0, this is a special case, it means to allocate in place
453 * at the current location of alloc_bottom or fail (that is basically
454 * extending the previous allocation). Used for the device-tree flattening
456 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
458 unsigned long offset = reloc_offset();
459 unsigned long base = _ALIGN_UP(RELOC(alloc_bottom), align);
460 unsigned long addr = 0;
462 prom_debug("alloc_up(%x, %x)\n", size, align);
463 if (RELOC(ram_top) == 0)
464 prom_panic("alloc_up() called with mem not initialized\n");
467 base = _ALIGN_UP(RELOC(alloc_bottom), align);
469 base = RELOC(alloc_bottom);
471 for(; (base + size) <= RELOC(alloc_top);
472 base = _ALIGN_UP(base + 0x100000, align)) {
473 prom_debug(" trying: 0x%x\n\r", base);
474 addr = (unsigned long)prom_claim(base, size, 0);
475 if ((int)addr != PROM_ERROR)
483 RELOC(alloc_bottom) = addr;
485 prom_debug(" -> %x\n", addr);
486 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
487 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
488 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
489 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
490 prom_debug(" ram_top : %x\n", RELOC(ram_top));
496 * Allocates memory downard, either from top of RMO, or if highmem
497 * is set, from the top of RAM. Note that this one doesn't handle
498 * failures. In does claim memory if highmem is not set.
500 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
503 unsigned long offset = reloc_offset();
504 unsigned long base, addr = 0;
506 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
507 highmem ? RELOC("(high)") : RELOC("(low)"));
508 if (RELOC(ram_top) == 0)
509 prom_panic("alloc_down() called with mem not initialized\n");
512 /* Carve out storage for the TCE table. */
513 addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align);
514 if (addr <= RELOC(alloc_bottom))
517 /* Will we bump into the RMO ? If yes, check out that we
518 * didn't overlap existing allocations there, if we did,
519 * we are dead, we must be the first in town !
521 if (addr < RELOC(rmo_top)) {
522 /* Good, we are first */
523 if (RELOC(alloc_top) == RELOC(rmo_top))
524 RELOC(alloc_top) = RELOC(rmo_top) = addr;
528 RELOC(alloc_top_high) = addr;
533 base = _ALIGN_DOWN(RELOC(alloc_top) - size, align);
534 for(; base > RELOC(alloc_bottom); base = _ALIGN_DOWN(base - 0x100000, align)) {
535 prom_debug(" trying: 0x%x\n\r", base);
536 addr = (unsigned long)prom_claim(base, size, 0);
537 if ((int)addr != PROM_ERROR)
543 RELOC(alloc_top) = addr;
546 prom_debug(" -> %x\n", addr);
547 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
548 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
549 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
550 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
551 prom_debug(" ram_top : %x\n", RELOC(ram_top));
559 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
564 /* Ignore more than 2 cells */
580 * Very dumb function for adding to the memory reserve list, but
581 * we don't need anything smarter at this point
583 * XXX Eventually check for collisions. They should NEVER happen
584 * if problems seem to show up, it would be a good start to track
587 static void reserve_mem(unsigned long base, unsigned long size)
589 unsigned long offset = reloc_offset();
590 unsigned long top = base + size;
591 unsigned long cnt = RELOC(mem_reserve_cnt);
596 /* We need to always keep one empty entry so that we
597 * have our terminator with "size" set to 0 since we are
598 * dumb and just copy this entire array to the boot params
600 base = _ALIGN_DOWN(base, PAGE_SIZE);
601 top = _ALIGN_UP(top, PAGE_SIZE);
604 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
605 prom_panic("Memory reserve map exhausted !\n");
606 RELOC(mem_reserve_map)[cnt].base = base;
607 RELOC(mem_reserve_map)[cnt].size = size;
608 RELOC(mem_reserve_cnt) = cnt + 1;
612 * Initialize memory allocation mecanism, parse "memory" nodes and
613 * obtain that way the top of memory and RMO to setup out local allocator
615 static void __init prom_init_mem(void)
618 char *path, type[64];
621 unsigned long offset = reloc_offset();
622 struct prom_t *_prom = PTRRELOC(&prom);
625 * We iterate the memory nodes to find
626 * 1) top of RMO (first node)
629 prom_debug("root_addr_cells: %x\n", (long)_prom->root_addr_cells);
630 prom_debug("root_size_cells: %x\n", (long)_prom->root_size_cells);
632 prom_debug("scanning memory:\n");
633 path = RELOC(prom_scratch);
635 for (node = 0; prom_next_node(&node); ) {
637 prom_getprop(node, "device_type", type, sizeof(type));
639 if (strcmp(type, RELOC("memory")))
642 plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf));
643 if (plen > sizeof(regbuf)) {
644 prom_printf("memory node too large for buffer !\n");
645 plen = sizeof(regbuf);
648 endp = p + (plen / sizeof(cell_t));
651 memset(path, 0, PROM_SCRATCH_SIZE);
652 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
653 prom_debug(" node %s :\n", path);
654 #endif /* DEBUG_PROM */
656 while ((endp - p) >= (_prom->root_addr_cells + _prom->root_size_cells)) {
657 unsigned long base, size;
659 base = prom_next_cell(_prom->root_addr_cells, &p);
660 size = prom_next_cell(_prom->root_size_cells, &p);
664 prom_debug(" %x %x\n", base, size);
666 RELOC(rmo_top) = size;
667 if ((base + size) > RELOC(ram_top))
668 RELOC(ram_top) = base + size;
672 /* Setup our top/bottom alloc points, that is top of RMO or top of
673 * segment 0 when running non-LPAR
675 if ( RELOC(of_platform) == PLATFORM_PSERIES_LPAR )
676 RELOC(alloc_top) = RELOC(rmo_top);
678 RELOC(alloc_top) = min(0x40000000ul, RELOC(ram_top));
679 RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(klimit) - offset + 0x4000);
680 RELOC(alloc_top_high) = RELOC(ram_top);
682 /* Check if we have an initrd after the kernel, if we do move our bottom
685 if (RELOC(prom_initrd_start)) {
686 if ((RELOC(prom_initrd_start) + RELOC(prom_initrd_end))
687 > RELOC(alloc_bottom))
688 RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end));
691 prom_printf("memory layout at init:\n");
692 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom));
693 prom_printf(" alloc_top : %x\n", RELOC(alloc_top));
694 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
695 prom_printf(" rmo_top : %x\n", RELOC(rmo_top));
696 prom_printf(" ram_top : %x\n", RELOC(ram_top));
701 * Allocate room for and instanciate RTAS
703 static void __init prom_instantiate_rtas(void)
705 unsigned long offset = reloc_offset();
706 struct prom_t *_prom = PTRRELOC(&prom);
711 prom_debug("prom_instantiate_rtas: start...\n");
713 prom_rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
714 if (prom_rtas != (phandle) -1) {
715 prom_getprop(prom_rtas, "rtas-size", &size, sizeof(size));
717 base = alloc_down(size, PAGE_SIZE, 0);
719 prom_printf("RTAS allocation failed !\n");
722 prom_printf("instantiating rtas at 0x%x", base);
724 prom_rtas = call_prom("open", 1, 1, ADDR("/rtas"));
727 if (call_prom("call-method", 3, 2,
728 ADDR("instantiate-rtas"),
729 prom_rtas, base) != PROM_ERROR) {
730 entry = (long)_prom->args.rets[1];
733 prom_printf(" failed\n");
736 prom_printf(" done\n");
738 reserve_mem(base, size);
741 prom_setprop(_prom->chosen, "linux,rtas-base", &base, sizeof(base));
742 prom_setprop(_prom->chosen, "linux,rtas-entry", &entry, sizeof(entry));
743 prom_setprop(_prom->chosen, "linux,rtas-size", &size, sizeof(size));
745 prom_debug("rtas base = 0x%x\n", base);
746 prom_debug("rtas entry = 0x%x\n", entry);
747 prom_debug("rtas size = 0x%x\n", (long)size);
749 prom_debug("prom_instantiate_rtas: end...\n");
754 * Allocate room for and initialize TCE tables
756 static void __init prom_initialize_tce_table(void)
760 unsigned long offset = reloc_offset();
761 char compatible[64], type[64], model[64];
762 char *path = RELOC(prom_scratch);
763 u64 base, vbase, align;
764 u32 minalign, minsize;
765 u64 tce_entry, *tce_entryp;
766 u64 local_alloc_top, local_alloc_bottom;
769 if (RELOC(ppc64_iommu_off))
772 prom_debug("starting prom_initialize_tce_table\n");
774 /* Cache current top of allocs so we reserve a single block */
775 local_alloc_top = RELOC(alloc_top_high);
776 local_alloc_bottom = local_alloc_top;
778 /* Search all nodes looking for PHBs. */
779 for (node = 0; prom_next_node(&node); ) {
783 prom_getprop(node, "compatible",
784 compatible, sizeof(compatible));
785 prom_getprop(node, "device_type", type, sizeof(type));
786 prom_getprop(node, "model", model, sizeof(model));
788 if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL))
791 /* Keep the old logic in tack to avoid regression. */
792 if (compatible[0] != 0) {
793 if ((strstr(compatible, RELOC("python")) == NULL) &&
794 (strstr(compatible, RELOC("Speedwagon")) == NULL) &&
795 (strstr(compatible, RELOC("Winnipeg")) == NULL))
797 } else if (model[0] != 0) {
798 if ((strstr(model, RELOC("ython")) == NULL) &&
799 (strstr(model, RELOC("peedwagon")) == NULL) &&
800 (strstr(model, RELOC("innipeg")) == NULL))
804 if (prom_getprop(node, "tce-table-minalign", &minalign,
805 sizeof(minalign)) == PROM_ERROR)
807 if (prom_getprop(node, "tce-table-minsize", &minsize,
808 sizeof(minsize)) == PROM_ERROR)
812 * Even though we read what OF wants, we just set the table
813 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
814 * By doing this, we avoid the pitfalls of trying to DMA to
815 * MMIO space and the DMA alias hole.
817 * On POWER4, firmware sets the TCE region by assuming
818 * each TCE table is 8MB. Using this memory for anything
819 * else will impact performance, so we always allocate 8MB.
822 if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p))
827 /* Align to the greater of the align or size */
828 align = max(minalign, minsize);
829 base = alloc_down(minsize, align, 1);
831 prom_panic("ERROR, cannot find space for TCE table.\n");
832 if (base < local_alloc_bottom)
833 local_alloc_bottom = base;
835 vbase = (unsigned long)abs_to_virt(base);
837 /* Save away the TCE table attributes for later use. */
838 prom_setprop(node, "linux,tce-base", &vbase, sizeof(vbase));
839 prom_setprop(node, "linux,tce-size", &minsize, sizeof(minsize));
840 prom_setprop(node, "linux,has-tce-table", NULL, 0);
842 /* It seems OF doesn't null-terminate the path :-( */
843 memset(path, 0, sizeof(path));
844 /* Call OF to setup the TCE hardware */
845 if (call_prom("package-to-path", 3, 1, node,
846 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
847 prom_printf("package-to-path failed\n");
850 prom_debug("TCE table: %s\n", path);
851 prom_debug("\tnode = 0x%x\n", node);
852 prom_debug("\tbase = 0x%x\n", vbase);
853 prom_debug("\tsize = 0x%x\n", minsize);
855 /* Initialize the table to have a one-to-one mapping
856 * over the allocated size.
858 tce_entryp = (unsigned long *)base;
859 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
860 tce_entry = (i << PAGE_SHIFT);
862 *tce_entryp = tce_entry;
865 prom_printf("opening PHB %s", path);
866 phb_node = call_prom("open", 1, 1, path);
867 if ( (long)phb_node <= 0)
868 prom_printf("... failed\n");
870 prom_printf("... done\n");
872 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
873 phb_node, -1, minsize,
874 (u32) base, (u32) (base >> 32));
875 call_prom("close", 1, 0, phb_node);
878 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
880 /* Flag the first invalid entry */
881 prom_debug("ending prom_initialize_tce_table\n");
885 * With CHRP SMP we need to use the OF to start the other
886 * processors so we can't wait until smp_boot_cpus (the OF is
887 * trashed by then) so we have to put the processors into
888 * a holding pattern controlled by the kernel (not OF) before
891 * This uses a chunk of low memory, puts some holding pattern
892 * code there and sends the other processors off to there until
893 * smp_boot_cpus tells them to do something. The holding pattern
894 * checks that address until its cpu # is there, when it is that
895 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
896 * of setting those values.
898 * We also use physical address 0x4 here to tell when a cpu
899 * is in its holding pattern code.
901 * Fixup comment... DRENG / PPPBBB - Peter
905 static void __init prom_hold_cpus(void)
910 unsigned long offset = reloc_offset();
913 unsigned int interrupt_server[MAX_CPU_THREADS];
914 unsigned int cpu_threads, hw_cpu_num;
916 extern void __secondary_hold(void);
917 extern unsigned long __secondary_hold_spinloop;
918 extern unsigned long __secondary_hold_acknowledge;
919 unsigned long *spinloop
920 = (void *)virt_to_abs(&__secondary_hold_spinloop);
921 unsigned long *acknowledge
922 = (void *)virt_to_abs(&__secondary_hold_acknowledge);
923 unsigned long secondary_hold
924 = virt_to_abs(*PTRRELOC((unsigned long *)__secondary_hold));
925 struct prom_t *_prom = PTRRELOC(&prom);
927 prom_debug("prom_hold_cpus: start...\n");
928 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
929 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
930 prom_debug(" 1) acknowledge = 0x%x\n",
931 (unsigned long)acknowledge);
932 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
933 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
935 /* Set the common spinloop variable, so all of the secondary cpus
936 * will block when they are awakened from their OF spinloop.
937 * This must occur for both SMP and non SMP kernels, since OF will
938 * be trashed when we move the kernel.
943 for (i=0; i < NR_CPUS; i++) {
944 RELOC(hmt_thread_data)[i].pir = 0xdeadbeef;
948 for (node = 0; prom_next_node(&node); ) {
950 prom_getprop(node, "device_type", type, sizeof(type));
951 if (strcmp(type, RELOC("cpu")) != 0)
954 /* Skip non-configured cpus. */
955 prom_getprop(node, "status", type, sizeof(type));
956 if (strcmp(type, RELOC("okay")) != 0)
960 prom_getprop(node, "reg", ®, sizeof(reg));
962 prom_debug("\ncpuid = 0x%x\n", cpuid);
963 prom_debug("cpu hw idx = 0x%x\n", reg);
965 /* Init the acknowledge var which will be reset by
966 * the secondary cpu when it awakens from its OF
969 *acknowledge = (unsigned long)-1;
971 propsize = prom_getprop(node, "ibm,ppc-interrupt-server#s",
973 sizeof(interrupt_server));
975 /* no property. old hardware has no SMT */
977 interrupt_server[0] = reg; /* fake it with phys id */
979 /* We have a threaded processor */
980 cpu_threads = propsize / sizeof(u32);
981 if (cpu_threads > MAX_CPU_THREADS) {
982 prom_printf("SMT: too many threads!\n"
983 "SMT: found %x, max is %x\n",
984 cpu_threads, MAX_CPU_THREADS);
985 cpu_threads = 1; /* ToDo: panic? */
989 hw_cpu_num = interrupt_server[0];
990 if (hw_cpu_num != _prom->cpu) {
991 /* Primary Thread of non-boot cpu */
992 prom_printf("%x : starting cpu hw idx %x... ", cpuid, reg);
993 call_prom("start-cpu", 3, 0, node,
994 secondary_hold, cpuid);
996 for ( i = 0 ; (i < 100000000) &&
997 (*acknowledge == ((unsigned long)-1)); i++ ) ;
999 if (*acknowledge == cpuid) {
1000 prom_printf("done\n");
1001 /* We have to get every CPU out of OF,
1002 * even if we never start it. */
1003 if (cpuid >= NR_CPUS)
1006 prom_printf("failed: %x\n", *acknowledge);
1011 prom_printf("%x : boot cpu %x\n", cpuid, reg);
1015 /* Init paca for secondary threads. They start later. */
1016 for (i=1; i < cpu_threads; i++) {
1018 if (cpuid >= NR_CPUS)
1021 #endif /* CONFIG_SMP */
1025 /* Only enable HMT on processors that provide support. */
1026 if (__is_processor(PV_PULSAR) ||
1027 __is_processor(PV_ICESTAR) ||
1028 __is_processor(PV_SSTAR)) {
1029 prom_printf(" starting secondary threads\n");
1031 for (i = 0; i < NR_CPUS; i += 2) {
1036 unsigned long pir = mfspr(SPRN_PIR);
1037 if (__is_processor(PV_PULSAR)) {
1038 RELOC(hmt_thread_data)[i].pir =
1041 RELOC(hmt_thread_data)[i].pir =
1047 prom_printf("Processor is not HMT capable\n");
1051 if (cpuid > NR_CPUS)
1052 prom_printf("WARNING: maximum CPUs (" __stringify(NR_CPUS)
1053 ") exceeded: ignoring extras\n");
1055 prom_debug("prom_hold_cpus: end...\n");
1059 static void __init prom_init_client_services(unsigned long pp)
1061 unsigned long offset = reloc_offset();
1062 struct prom_t *_prom = PTRRELOC(&prom);
1064 /* Get a handle to the prom entry point before anything else */
1067 /* Init default value for phys size */
1068 _prom->root_size_cells = 1;
1069 _prom->root_addr_cells = 2;
1071 /* get a handle for the stdout device */
1072 _prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1073 if ((long)_prom->chosen <= 0)
1074 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1076 /* get device tree root */
1077 _prom->root = call_prom("finddevice", 1, 1, ADDR("/"));
1078 if ((long)_prom->root <= 0)
1079 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1082 static void __init prom_init_stdout(void)
1084 unsigned long offset = reloc_offset();
1085 struct prom_t *_prom = PTRRELOC(&prom);
1086 char *path = RELOC(of_stdout_device);
1090 if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0)
1091 prom_panic("cannot find stdout");
1093 _prom->stdout = val;
1095 /* Get the full OF pathname of the stdout device */
1096 memset(path, 0, 256);
1097 call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255);
1098 val = call_prom("instance-to-package", 1, 1, _prom->stdout);
1099 prom_setprop(_prom->chosen, "linux,stdout-package", &val, sizeof(val));
1100 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device));
1101 prom_setprop(_prom->chosen, "linux,stdout-path",
1102 RELOC(of_stdout_device), strlen(RELOC(of_stdout_device))+1);
1104 /* If it's a display, note it */
1105 memset(type, 0, sizeof(type));
1106 prom_getprop(val, "device_type", type, sizeof(type));
1107 if (strcmp(type, RELOC("display")) == 0) {
1108 _prom->disp_node = val;
1109 prom_setprop(val, "linux,boot-display", NULL, 0);
1113 static int __init prom_find_machine_type(void)
1115 unsigned long offset = reloc_offset();
1116 struct prom_t *_prom = PTRRELOC(&prom);
1121 len = prom_getprop(_prom->root, "compatible",
1122 compat, sizeof(compat)-1);
1126 char *p = &compat[i];
1130 if (strstr(p, RELOC("Power Macintosh")) ||
1131 strstr(p, RELOC("MacRISC4")))
1132 return PLATFORM_POWERMAC;
1136 /* Default to pSeries. We need to know if we are running LPAR */
1137 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1138 if (rtas != (phandle) -1) {
1140 x = prom_getproplen(rtas, "ibm,hypertas-functions");
1141 if (x != PROM_ERROR) {
1142 prom_printf("Hypertas detected, assuming LPAR !\n");
1143 return PLATFORM_PSERIES_LPAR;
1146 return PLATFORM_PSERIES;
1149 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
1151 unsigned long offset = reloc_offset();
1153 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
1157 * If we have a display that we don't know how to drive,
1158 * we will want to try to execute OF's open method for it
1159 * later. However, OF will probably fall over if we do that
1160 * we've taken over the MMU.
1161 * So we check whether we will need to open the display,
1162 * and if so, open it now.
1164 static unsigned long __init prom_check_displays(void)
1166 unsigned long offset = reloc_offset();
1167 struct prom_t *_prom = PTRRELOC(&prom);
1168 char type[16], *path;
1173 static unsigned char default_colors[] = {
1191 const unsigned char *clut;
1193 prom_printf("Looking for displays\n");
1194 for (node = 0; prom_next_node(&node); ) {
1195 memset(type, 0, sizeof(type));
1196 prom_getprop(node, "device_type", type, sizeof(type));
1197 if (strcmp(type, RELOC("display")) != 0)
1200 /* It seems OF doesn't null-terminate the path :-( */
1201 path = RELOC(prom_scratch);
1202 memset(path, 0, PROM_SCRATCH_SIZE);
1205 * leave some room at the end of the path for appending extra
1208 if (call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-10) < 0)
1210 prom_printf("found display : %s, opening ... ", path);
1212 ih = call_prom("open", 1, 1, path);
1213 if (ih == (ihandle)0 || ih == (ihandle)-1) {
1214 prom_printf("failed\n");
1219 prom_printf("done\n");
1220 prom_setprop(node, "linux,opened", NULL, 0);
1223 * stdout wasn't a display node, pick the first we can find
1226 if (_prom->disp_node == 0)
1227 _prom->disp_node = node;
1229 /* Setup a useable color table when the appropriate
1230 * method is available. Should update this to set-colors */
1231 clut = RELOC(default_colors);
1232 for (i = 0; i < 32; i++, clut += 3)
1233 if (prom_set_color(ih, i, clut[0], clut[1],
1237 #ifdef CONFIG_LOGO_LINUX_CLUT224
1238 clut = PTRRELOC(RELOC(logo_linux_clut224.clut));
1239 for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3)
1240 if (prom_set_color(ih, i + 32, clut[0], clut[1],
1243 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
1248 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
1249 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
1250 unsigned long needed, unsigned long align)
1252 unsigned long offset = reloc_offset();
1255 *mem_start = _ALIGN(*mem_start, align);
1256 while ((*mem_start + needed) > *mem_end) {
1257 unsigned long room, chunk;
1259 prom_debug("Chunk exhausted, claiming more at %x...\n",
1260 RELOC(alloc_bottom));
1261 room = RELOC(alloc_top) - RELOC(alloc_bottom);
1262 if (room > DEVTREE_CHUNK_SIZE)
1263 room = DEVTREE_CHUNK_SIZE;
1264 if (room < PAGE_SIZE)
1265 prom_panic("No memory for flatten_device_tree (no room)");
1266 chunk = alloc_up(room, 0);
1268 prom_panic("No memory for flatten_device_tree (claim failed)");
1269 *mem_end = RELOC(alloc_top);
1272 ret = (void *)*mem_start;
1273 *mem_start += needed;
1278 #define dt_push_token(token, mem_start, mem_end) \
1279 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
1281 static unsigned long __init dt_find_string(char *str)
1283 unsigned long offset = reloc_offset();
1286 s = os = (char *)RELOC(dt_string_start);
1288 while (s < (char *)RELOC(dt_string_end)) {
1289 if (strcmp(s, str) == 0)
1296 static void __init scan_dt_build_strings(phandle node, unsigned long *mem_start,
1297 unsigned long *mem_end)
1299 unsigned long offset = reloc_offset();
1300 char *prev_name, *namep, *sstart;
1304 sstart = (char *)RELOC(dt_string_start);
1306 /* get and store all property names */
1307 prev_name = RELOC("");
1310 /* 32 is max len of name including nul. */
1311 namep = make_room(mem_start, mem_end, 32, 1);
1312 if (call_prom("nextprop", 3, 1, node, prev_name, namep) <= 0) {
1313 /* No more nodes: unwind alloc */
1314 *mem_start = (unsigned long)namep;
1317 soff = dt_find_string(namep);
1319 *mem_start = (unsigned long)namep;
1320 namep = sstart + soff;
1322 /* Trim off some if we can */
1323 *mem_start = (unsigned long)namep + strlen(namep) + 1;
1324 RELOC(dt_string_end) = *mem_start;
1329 /* do all our children */
1330 child = call_prom("child", 1, 1, node);
1331 while (child != (phandle)0) {
1332 scan_dt_build_strings(child, mem_start, mem_end);
1333 child = call_prom("peer", 1, 1, child);
1337 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
1338 unsigned long *mem_end)
1342 char *namep, *prev_name, *sstart;
1344 unsigned char *valp;
1345 unsigned long offset = reloc_offset();
1349 path = RELOC(prom_scratch);
1351 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
1353 /* get the node's full name */
1354 namep = (char *)*mem_start;
1355 l = call_prom("package-to-path", 3, 1, node,
1356 namep, *mem_end - *mem_start);
1358 /* Didn't fit? Get more room. */
1359 if (l+1 > *mem_end - *mem_start) {
1360 namep = make_room(mem_start, mem_end, l+1, 1);
1361 call_prom("package-to-path", 3, 1, node, namep, l);
1364 *mem_start = _ALIGN(((unsigned long) namep) + strlen(namep) + 1, 4);
1367 /* get it again for debugging */
1368 memset(path, 0, PROM_SCRATCH_SIZE);
1369 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1371 /* get and store all properties */
1372 prev_name = RELOC("");
1373 sstart = (char *)RELOC(dt_string_start);
1375 if (call_prom("nextprop", 3, 1, node, prev_name, pname) <= 0)
1378 /* find string offset */
1379 soff = dt_find_string(pname);
1381 prom_printf("WARNING: Can't find string index for <%s>, node %s\n",
1385 prev_name = sstart + soff;
1388 l = call_prom("getproplen", 2, 1, node, pname);
1393 if (l > MAX_PROPERTY_LENGTH) {
1394 prom_printf("WARNING: ignoring large property ");
1395 /* It seems OF doesn't null-terminate the path :-( */
1396 prom_printf("[%s] ", path);
1397 prom_printf("%s length 0x%x\n", pname, l);
1401 /* push property head */
1402 dt_push_token(OF_DT_PROP, mem_start, mem_end);
1403 dt_push_token(l, mem_start, mem_end);
1404 dt_push_token(soff, mem_start, mem_end);
1406 /* push property content */
1407 align = (l >= 8) ? 8 : 4;
1408 valp = make_room(mem_start, mem_end, l, align);
1409 call_prom("getprop", 4, 1, node, pname, valp, l);
1410 *mem_start = _ALIGN(*mem_start, 4);
1413 /* Add a "linux,phandle" property. */
1414 soff = dt_find_string(RELOC("linux,phandle"));
1416 prom_printf("WARNING: Can't find string index for <linux-phandle>"
1417 " node %s\n", path);
1419 dt_push_token(OF_DT_PROP, mem_start, mem_end);
1420 dt_push_token(4, mem_start, mem_end);
1421 dt_push_token(soff, mem_start, mem_end);
1422 valp = make_room(mem_start, mem_end, 4, 4);
1423 *(u32 *)valp = node;
1426 /* do all our children */
1427 child = call_prom("child", 1, 1, node);
1428 while (child != (phandle)0) {
1429 scan_dt_build_struct(child, mem_start, mem_end);
1430 child = call_prom("peer", 1, 1, child);
1433 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
1436 static void __init flatten_device_tree(void)
1439 unsigned long offset = reloc_offset();
1440 unsigned long mem_start, mem_end, room;
1441 struct boot_param_header *hdr;
1446 * Check how much room we have between alloc top & bottom (+/- a
1447 * few pages), crop to 4Mb, as this is our "chuck" size
1449 room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000;
1450 if (room > DEVTREE_CHUNK_SIZE)
1451 room = DEVTREE_CHUNK_SIZE;
1452 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom));
1454 /* Now try to claim that */
1455 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
1457 prom_panic("Can't allocate initial device-tree chunk\n");
1458 mem_end = RELOC(alloc_top);
1460 /* Get root of tree */
1461 root = call_prom("peer", 1, 1, (phandle)0);
1462 if (root == (phandle)0)
1463 prom_panic ("couldn't get device tree root\n");
1465 /* Build header and make room for mem rsv map */
1466 mem_start = _ALIGN(mem_start, 4);
1467 hdr = make_room(&mem_start, &mem_end, sizeof(struct boot_param_header), 4);
1468 RELOC(dt_header_start) = (unsigned long)hdr;
1469 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
1471 /* Start of strings */
1472 mem_start = PAGE_ALIGN(mem_start);
1473 RELOC(dt_string_start) = mem_start;
1474 mem_start += 4; /* hole */
1476 /* Add "linux,phandle" in there, we'll need it */
1477 namep = make_room(&mem_start, &mem_end, 16, 1);
1478 strcpy(namep, RELOC("linux,phandle"));
1479 mem_start = (unsigned long)namep + strlen(namep) + 1;
1480 RELOC(dt_string_end) = mem_start;
1482 /* Build string array */
1483 prom_printf("Building dt strings...\n");
1484 scan_dt_build_strings(root, &mem_start, &mem_end);
1486 /* Build structure */
1487 mem_start = PAGE_ALIGN(mem_start);
1488 RELOC(dt_struct_start) = mem_start;
1489 prom_printf("Building dt structure...\n");
1490 scan_dt_build_struct(root, &mem_start, &mem_end);
1491 dt_push_token(OF_DT_END, &mem_start, &mem_end);
1492 RELOC(dt_struct_end) = PAGE_ALIGN(mem_start);
1495 hdr->magic = OF_DT_HEADER;
1496 hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start);
1497 hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start);
1498 hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start);
1499 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start);
1500 hdr->version = OF_DT_VERSION;
1501 hdr->last_comp_version = 1;
1503 /* Reserve the whole thing and copy the reserve map in, we
1504 * also bump mem_reserve_cnt to cause further reservations to
1505 * fail since it's too late.
1507 reserve_mem(RELOC(dt_header_start), hdr->totalsize);
1508 memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map));
1513 prom_printf("reserved memory map:\n");
1514 for (i = 0; i < RELOC(mem_reserve_cnt); i++)
1515 prom_printf(" %x - %x\n", RELOC(mem_reserve_map)[i].base,
1516 RELOC(mem_reserve_map)[i].size);
1519 RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE;
1521 prom_printf("Device tree strings 0x%x -> 0x%x\n",
1522 RELOC(dt_string_start), RELOC(dt_string_end));
1523 prom_printf("Device tree struct 0x%x -> 0x%x\n",
1524 RELOC(dt_struct_start), RELOC(dt_struct_end));
1528 static void __init prom_find_boot_cpu(void)
1530 unsigned long offset = reloc_offset();
1531 struct prom_t *_prom = PTRRELOC(&prom);
1536 if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)
1537 prom_panic("cannot find boot cpu");
1539 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
1541 prom_setprop(cpu_pkg, "linux,boot-cpu", NULL, 0);
1542 prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval));
1543 _prom->cpu = getprop_rval;
1545 prom_debug("Booting CPU hw index = 0x%x\n", _prom->cpu);
1548 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
1550 #ifdef CONFIG_BLK_DEV_INITRD
1551 unsigned long offset = reloc_offset();
1552 struct prom_t *_prom = PTRRELOC(&prom);
1554 if ( r3 && r4 && r4 != 0xdeadbeef) {
1557 RELOC(prom_initrd_start) = (r3 >= KERNELBASE) ? __pa(r3) : r3;
1558 RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4;
1560 val = (u64)RELOC(prom_initrd_start);
1561 prom_setprop(_prom->chosen, "linux,initrd-start", &val, sizeof(val));
1562 val = (u64)RELOC(prom_initrd_end);
1563 prom_setprop(_prom->chosen, "linux,initrd-end", &val, sizeof(val));
1565 reserve_mem(RELOC(prom_initrd_start),
1566 RELOC(prom_initrd_end) - RELOC(prom_initrd_start));
1568 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start));
1569 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end));
1571 #endif /* CONFIG_BLK_DEV_INITRD */
1575 * We enter here early on, when the Open Firmware prom is still
1576 * handling exceptions and the MMU hash table for us.
1579 unsigned long __init prom_init(unsigned long r3, unsigned long r4, unsigned long pp,
1580 unsigned long r6, unsigned long r7)
1582 unsigned long offset = reloc_offset();
1583 struct prom_t *_prom = PTRRELOC(&prom);
1584 unsigned long phys = KERNELBASE - offset;
1588 * First zero the BSS
1590 memset(PTRRELOC(&__bss_start), 0, __bss_stop - __bss_start);
1593 * Init interface to Open Firmware, get some node references,
1596 prom_init_client_services(pp);
1599 * Init prom stdout device
1602 prom_debug("klimit=0x%x\n", RELOC(klimit));
1603 prom_debug("offset=0x%x\n", offset);
1606 * Reserve kernel in reserve map
1608 reserve_mem(0, __pa(RELOC(klimit)));
1611 * Check for an initrd
1613 prom_check_initrd(r3, r4);
1616 * Get default machine type. At this point, we do not differenciate
1617 * between pSeries SMP and pSeries LPAR
1619 RELOC(of_platform) = prom_find_machine_type();
1620 getprop_rval = RELOC(of_platform);
1621 prom_setprop(_prom->chosen, "linux,platform",
1622 &getprop_rval, sizeof(getprop_rval));
1625 * On pSeries, copy the CPU hold code
1627 if (RELOC(of_platform) & PLATFORM_PSERIES)
1628 copy_and_flush(0, KERNELBASE - offset, 0x100, 0);
1631 * Get memory cells format
1634 prom_getprop(_prom->root, "#size-cells",
1635 &getprop_rval, sizeof(getprop_rval));
1636 _prom->root_size_cells = getprop_rval;
1638 prom_getprop(_prom->root, "#address-cells",
1639 &getprop_rval, sizeof(getprop_rval));
1640 _prom->root_addr_cells = getprop_rval;
1643 * Do early parsing of command line
1645 early_cmdline_parse();
1648 * Initialize memory management within prom_init
1653 * Determine which cpu is actually running right _now_
1655 prom_find_boot_cpu();
1658 * Initialize display devices
1660 prom_check_displays();
1663 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
1664 * that uses the allocator, we need to make sure we get the top of memory
1665 * available for us here...
1667 if (RELOC(of_platform) == PLATFORM_PSERIES)
1668 prom_initialize_tce_table();
1671 * On non-powermacs, try to instantiate RTAS and puts all CPUs
1672 * in spin-loops. PowerMacs don't have a working RTAS and use
1673 * a different way to spin CPUs
1675 if (RELOC(of_platform) != PLATFORM_POWERMAC) {
1676 prom_instantiate_rtas();
1681 * Fill in some infos for use by the kernel later on
1683 if (RELOC(ppc64_iommu_off))
1684 prom_setprop(_prom->chosen, "linux,iommu-off", NULL, 0);
1685 if (RELOC(iommu_force_on))
1686 prom_setprop(_prom->chosen, "linux,iommu-force-on", NULL, 0);
1689 * Now finally create the flattened device-tree
1691 prom_printf("copying OF device tree ...\n");
1692 flatten_device_tree();
1695 * Call OF "quiesce" method to shut down pending DMA's from
1698 prom_printf("Calling quiesce ...\n");
1699 call_prom("quiesce", 0, 0);
1702 * And finally, call the kernel passing it the flattened device
1703 * tree and NULL as r5, thus triggering the new entry point which
1704 * is common to us and kexec
1706 prom_printf("returning from prom_init\n");
1707 prom_debug("->dt_header_start=0x%x\n", RELOC(dt_header_start));
1708 prom_debug("->phys=0x%x\n", phys);
1710 __start(RELOC(dt_header_start), phys, 0);