![Michael Ellerman](/assets/img/avatar_default.png)
Up until now we have only used cpu_to_chip_id() in the topology code,
which is only used on SMP builds. However my recent commit a4da0d5
"Implement arch_get_random_long/int() for powernv" added a usage when
SMP=n, breaking the build.
Move cpu_to_chip_id() into prom.c so it is available for SMP=n builds.
We would move the extern to prom.h, but that breaks the include in
topology.h. Instead we leave it in smp.h, but move it out of the
CONFIG_SMP #ifdef. We also need to include asm/smp.h in rng.c, because
the linux version skips asm/smp.h on UP. What a mess.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
894 lines
24 KiB
C
894 lines
24 KiB
C
/*
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* Procedures for creating, accessing and interpreting the device tree.
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*
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* Paul Mackerras August 1996.
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* Copyright (C) 1996-2005 Paul Mackerras.
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*
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* Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
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* {engebret|bergner}@us.ibm.com
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#undef DEBUG
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#include <stdarg.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/threads.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/stringify.h>
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#include <linux/delay.h>
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#include <linux/initrd.h>
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#include <linux/bitops.h>
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#include <linux/export.h>
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#include <linux/kexec.h>
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#include <linux/debugfs.h>
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#include <linux/irq.h>
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#include <linux/memblock.h>
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#include <linux/of.h>
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#include <asm/prom.h>
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#include <asm/rtas.h>
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#include <asm/page.h>
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#include <asm/processor.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#include <asm/kdump.h>
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#include <asm/smp.h>
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#include <asm/mmu.h>
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#include <asm/paca.h>
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#include <asm/pgtable.h>
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#include <asm/pci.h>
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#include <asm/iommu.h>
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#include <asm/btext.h>
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#include <asm/sections.h>
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#include <asm/machdep.h>
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#include <asm/pci-bridge.h>
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#include <asm/kexec.h>
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#include <asm/opal.h>
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#include <asm/fadump.h>
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#include <asm/debug.h>
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#include <mm/mmu_decl.h>
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#ifdef DEBUG
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#define DBG(fmt...) printk(KERN_ERR fmt)
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#else
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#define DBG(fmt...)
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#endif
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#ifdef CONFIG_PPC64
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int __initdata iommu_is_off;
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int __initdata iommu_force_on;
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unsigned long tce_alloc_start, tce_alloc_end;
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u64 ppc64_rma_size;
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#endif
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static phys_addr_t first_memblock_size;
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static int __initdata boot_cpu_count;
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static int __init early_parse_mem(char *p)
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{
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if (!p)
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return 1;
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memory_limit = PAGE_ALIGN(memparse(p, &p));
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DBG("memory limit = 0x%llx\n", memory_limit);
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return 0;
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}
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early_param("mem", early_parse_mem);
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/*
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* overlaps_initrd - check for overlap with page aligned extension of
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* initrd.
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*/
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static inline int overlaps_initrd(unsigned long start, unsigned long size)
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{
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#ifdef CONFIG_BLK_DEV_INITRD
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if (!initrd_start)
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return 0;
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return (start + size) > _ALIGN_DOWN(initrd_start, PAGE_SIZE) &&
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start <= _ALIGN_UP(initrd_end, PAGE_SIZE);
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#else
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return 0;
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#endif
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}
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/**
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* move_device_tree - move tree to an unused area, if needed.
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*
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* The device tree may be allocated beyond our memory limit, or inside the
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* crash kernel region for kdump, or within the page aligned range of initrd.
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* If so, move it out of the way.
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*/
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static void __init move_device_tree(void)
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{
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unsigned long start, size;
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void *p;
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DBG("-> move_device_tree\n");
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start = __pa(initial_boot_params);
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size = be32_to_cpu(initial_boot_params->totalsize);
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if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) ||
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overlaps_crashkernel(start, size) ||
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overlaps_initrd(start, size)) {
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p = __va(memblock_alloc(size, PAGE_SIZE));
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memcpy(p, initial_boot_params, size);
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initial_boot_params = (struct boot_param_header *)p;
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DBG("Moved device tree to 0x%p\n", p);
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}
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DBG("<- move_device_tree\n");
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}
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/*
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* ibm,pa-features is a per-cpu property that contains a string of
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* attribute descriptors, each of which has a 2 byte header plus up
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* to 254 bytes worth of processor attribute bits. First header
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* byte specifies the number of bytes following the header.
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* Second header byte is an "attribute-specifier" type, of which
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* zero is the only currently-defined value.
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* Implementation: Pass in the byte and bit offset for the feature
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* that we are interested in. The function will return -1 if the
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* pa-features property is missing, or a 1/0 to indicate if the feature
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* is supported/not supported. Note that the bit numbers are
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* big-endian to match the definition in PAPR.
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*/
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static struct ibm_pa_feature {
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unsigned long cpu_features; /* CPU_FTR_xxx bit */
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unsigned long mmu_features; /* MMU_FTR_xxx bit */
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unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */
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unsigned char pabyte; /* byte number in ibm,pa-features */
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unsigned char pabit; /* bit number (big-endian) */
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unsigned char invert; /* if 1, pa bit set => clear feature */
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} ibm_pa_features[] __initdata = {
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{0, 0, PPC_FEATURE_HAS_MMU, 0, 0, 0},
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{0, 0, PPC_FEATURE_HAS_FPU, 0, 1, 0},
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{0, MMU_FTR_SLB, 0, 0, 2, 0},
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{CPU_FTR_CTRL, 0, 0, 0, 3, 0},
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{CPU_FTR_NOEXECUTE, 0, 0, 0, 6, 0},
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{CPU_FTR_NODSISRALIGN, 0, 0, 1, 1, 1},
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{0, MMU_FTR_CI_LARGE_PAGE, 0, 1, 2, 0},
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{CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0},
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};
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static void __init scan_features(unsigned long node, unsigned char *ftrs,
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unsigned long tablelen,
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struct ibm_pa_feature *fp,
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unsigned long ft_size)
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{
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unsigned long i, len, bit;
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/* find descriptor with type == 0 */
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for (;;) {
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if (tablelen < 3)
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return;
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len = 2 + ftrs[0];
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if (tablelen < len)
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return; /* descriptor 0 not found */
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if (ftrs[1] == 0)
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break;
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tablelen -= len;
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ftrs += len;
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}
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/* loop over bits we know about */
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for (i = 0; i < ft_size; ++i, ++fp) {
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if (fp->pabyte >= ftrs[0])
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continue;
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bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
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if (bit ^ fp->invert) {
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cur_cpu_spec->cpu_features |= fp->cpu_features;
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cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
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cur_cpu_spec->mmu_features |= fp->mmu_features;
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} else {
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cur_cpu_spec->cpu_features &= ~fp->cpu_features;
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cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
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cur_cpu_spec->mmu_features &= ~fp->mmu_features;
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}
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}
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}
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static void __init check_cpu_pa_features(unsigned long node)
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{
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unsigned char *pa_ftrs;
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unsigned long tablelen;
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pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
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if (pa_ftrs == NULL)
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return;
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scan_features(node, pa_ftrs, tablelen,
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ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
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}
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#ifdef CONFIG_PPC_STD_MMU_64
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static void __init check_cpu_slb_size(unsigned long node)
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{
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__be32 *slb_size_ptr;
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slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL);
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if (slb_size_ptr != NULL) {
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mmu_slb_size = be32_to_cpup(slb_size_ptr);
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return;
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}
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slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
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if (slb_size_ptr != NULL) {
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mmu_slb_size = be32_to_cpup(slb_size_ptr);
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}
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}
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#else
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#define check_cpu_slb_size(node) do { } while(0)
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#endif
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static struct feature_property {
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const char *name;
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u32 min_value;
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unsigned long cpu_feature;
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unsigned long cpu_user_ftr;
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} feature_properties[] __initdata = {
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#ifdef CONFIG_ALTIVEC
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{"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
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{"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
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#endif /* CONFIG_ALTIVEC */
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#ifdef CONFIG_VSX
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/* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
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{"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX},
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#endif /* CONFIG_VSX */
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#ifdef CONFIG_PPC64
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{"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
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{"ibm,purr", 1, CPU_FTR_PURR, 0},
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{"ibm,spurr", 1, CPU_FTR_SPURR, 0},
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#endif /* CONFIG_PPC64 */
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};
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#if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
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static inline void identical_pvr_fixup(unsigned long node)
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{
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unsigned int pvr;
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char *model = of_get_flat_dt_prop(node, "model", NULL);
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/*
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* Since 440GR(x)/440EP(x) processors have the same pvr,
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* we check the node path and set bit 28 in the cur_cpu_spec
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* pvr for EP(x) processor version. This bit is always 0 in
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* the "real" pvr. Then we call identify_cpu again with
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* the new logical pvr to enable FPU support.
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*/
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if (model && strstr(model, "440EP")) {
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pvr = cur_cpu_spec->pvr_value | 0x8;
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identify_cpu(0, pvr);
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DBG("Using logical pvr %x for %s\n", pvr, model);
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}
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}
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#else
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#define identical_pvr_fixup(node) do { } while(0)
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#endif
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static void __init check_cpu_feature_properties(unsigned long node)
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{
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unsigned long i;
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struct feature_property *fp = feature_properties;
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const __be32 *prop;
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for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
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prop = of_get_flat_dt_prop(node, fp->name, NULL);
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if (prop && be32_to_cpup(prop) >= fp->min_value) {
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cur_cpu_spec->cpu_features |= fp->cpu_feature;
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cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
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}
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}
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}
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static int __init early_init_dt_scan_cpus(unsigned long node,
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const char *uname, int depth,
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void *data)
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{
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char *type = of_get_flat_dt_prop(node, "device_type", NULL);
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const __be32 *prop;
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const __be32 *intserv;
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int i, nthreads;
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unsigned long len;
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int found = -1;
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int found_thread = 0;
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/* We are scanning "cpu" nodes only */
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if (type == NULL || strcmp(type, "cpu") != 0)
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return 0;
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/* Get physical cpuid */
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intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
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if (intserv) {
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nthreads = len / sizeof(int);
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} else {
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intserv = of_get_flat_dt_prop(node, "reg", NULL);
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nthreads = 1;
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}
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/*
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* Now see if any of these threads match our boot cpu.
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* NOTE: This must match the parsing done in smp_setup_cpu_maps.
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*/
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for (i = 0; i < nthreads; i++) {
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/*
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* version 2 of the kexec param format adds the phys cpuid of
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* booted proc.
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*/
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if (be32_to_cpu(initial_boot_params->version) >= 2) {
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if (be32_to_cpu(intserv[i]) ==
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be32_to_cpu(initial_boot_params->boot_cpuid_phys)) {
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found = boot_cpu_count;
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found_thread = i;
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}
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} else {
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/*
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* Check if it's the boot-cpu, set it's hw index now,
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* unfortunately this format did not support booting
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* off secondary threads.
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*/
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if (of_get_flat_dt_prop(node,
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"linux,boot-cpu", NULL) != NULL)
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found = boot_cpu_count;
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}
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#ifdef CONFIG_SMP
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/* logical cpu id is always 0 on UP kernels */
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boot_cpu_count++;
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#endif
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}
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if (found >= 0) {
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DBG("boot cpu: logical %d physical %d\n", found,
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be32_to_cpu(intserv[found_thread]));
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boot_cpuid = found;
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set_hard_smp_processor_id(found,
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be32_to_cpu(intserv[found_thread]));
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/*
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* PAPR defines "logical" PVR values for cpus that
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* meet various levels of the architecture:
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* 0x0f000001 Architecture version 2.04
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* 0x0f000002 Architecture version 2.05
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* If the cpu-version property in the cpu node contains
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* such a value, we call identify_cpu again with the
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* logical PVR value in order to use the cpu feature
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* bits appropriate for the architecture level.
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*
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* A POWER6 partition in "POWER6 architected" mode
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* uses the 0x0f000002 PVR value; in POWER5+ mode
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* it uses 0x0f000001.
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*/
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prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
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if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000)
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identify_cpu(0, be32_to_cpup(prop));
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identical_pvr_fixup(node);
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}
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check_cpu_feature_properties(node);
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check_cpu_pa_features(node);
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check_cpu_slb_size(node);
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#ifdef CONFIG_PPC_PSERIES
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if (nthreads > 1)
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cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
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else
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cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
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#endif
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return 0;
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}
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int __init early_init_dt_scan_chosen_ppc(unsigned long node, const char *uname,
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int depth, void *data)
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{
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unsigned long *lprop; /* All these set by kernel, so no need to convert endian */
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/* Use common scan routine to determine if this is the chosen node */
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if (early_init_dt_scan_chosen(node, uname, depth, data) == 0)
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return 0;
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#ifdef CONFIG_PPC64
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/* check if iommu is forced on or off */
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if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
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iommu_is_off = 1;
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if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
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iommu_force_on = 1;
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#endif
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/* mem=x on the command line is the preferred mechanism */
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lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
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if (lprop)
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memory_limit = *lprop;
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#ifdef CONFIG_PPC64
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lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
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if (lprop)
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tce_alloc_start = *lprop;
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lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
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if (lprop)
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tce_alloc_end = *lprop;
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#endif
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#ifdef CONFIG_KEXEC
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lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
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if (lprop)
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crashk_res.start = *lprop;
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lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
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if (lprop)
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crashk_res.end = crashk_res.start + *lprop - 1;
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#endif
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/* break now */
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return 1;
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}
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#ifdef CONFIG_PPC_PSERIES
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/*
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* Interpret the ibm,dynamic-memory property in the
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* /ibm,dynamic-reconfiguration-memory node.
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* This contains a list of memory blocks along with NUMA affinity
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* information.
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*/
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static int __init early_init_dt_scan_drconf_memory(unsigned long node)
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{
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__be32 *dm, *ls, *usm;
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unsigned long l, n, flags;
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u64 base, size, memblock_size;
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unsigned int is_kexec_kdump = 0, rngs;
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ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
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if (ls == NULL || l < dt_root_size_cells * sizeof(__be32))
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return 0;
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memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls);
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dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
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if (dm == NULL || l < sizeof(__be32))
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return 0;
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n = of_read_number(dm++, 1); /* number of entries */
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if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32))
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return 0;
|
|
|
|
/* check if this is a kexec/kdump kernel. */
|
|
usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory",
|
|
&l);
|
|
if (usm != NULL)
|
|
is_kexec_kdump = 1;
|
|
|
|
for (; n != 0; --n) {
|
|
base = dt_mem_next_cell(dt_root_addr_cells, &dm);
|
|
flags = of_read_number(&dm[3], 1);
|
|
/* skip DRC index, pad, assoc. list index, flags */
|
|
dm += 4;
|
|
/* skip this block if the reserved bit is set in flags (0x80)
|
|
or if the block is not assigned to this partition (0x8) */
|
|
if ((flags & 0x80) || !(flags & 0x8))
|
|
continue;
|
|
size = memblock_size;
|
|
rngs = 1;
|
|
if (is_kexec_kdump) {
|
|
/*
|
|
* For each memblock in ibm,dynamic-memory, a corresponding
|
|
* entry in linux,drconf-usable-memory property contains
|
|
* a counter 'p' followed by 'p' (base, size) duple.
|
|
* Now read the counter from
|
|
* linux,drconf-usable-memory property
|
|
*/
|
|
rngs = dt_mem_next_cell(dt_root_size_cells, &usm);
|
|
if (!rngs) /* there are no (base, size) duple */
|
|
continue;
|
|
}
|
|
do {
|
|
if (is_kexec_kdump) {
|
|
base = dt_mem_next_cell(dt_root_addr_cells,
|
|
&usm);
|
|
size = dt_mem_next_cell(dt_root_size_cells,
|
|
&usm);
|
|
}
|
|
if (iommu_is_off) {
|
|
if (base >= 0x80000000ul)
|
|
continue;
|
|
if ((base + size) > 0x80000000ul)
|
|
size = 0x80000000ul - base;
|
|
}
|
|
memblock_add(base, size);
|
|
} while (--rngs);
|
|
}
|
|
memblock_dump_all();
|
|
return 0;
|
|
}
|
|
#else
|
|
#define early_init_dt_scan_drconf_memory(node) 0
|
|
#endif /* CONFIG_PPC_PSERIES */
|
|
|
|
static int __init early_init_dt_scan_memory_ppc(unsigned long node,
|
|
const char *uname,
|
|
int depth, void *data)
|
|
{
|
|
if (depth == 1 &&
|
|
strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
|
|
return early_init_dt_scan_drconf_memory(node);
|
|
|
|
return early_init_dt_scan_memory(node, uname, depth, data);
|
|
}
|
|
|
|
void __init early_init_dt_add_memory_arch(u64 base, u64 size)
|
|
{
|
|
#ifdef CONFIG_PPC64
|
|
if (iommu_is_off) {
|
|
if (base >= 0x80000000ul)
|
|
return;
|
|
if ((base + size) > 0x80000000ul)
|
|
size = 0x80000000ul - base;
|
|
}
|
|
#endif
|
|
/* Keep track of the beginning of memory -and- the size of
|
|
* the very first block in the device-tree as it represents
|
|
* the RMA on ppc64 server
|
|
*/
|
|
if (base < memstart_addr) {
|
|
memstart_addr = base;
|
|
first_memblock_size = size;
|
|
}
|
|
|
|
/* Add the chunk to the MEMBLOCK list */
|
|
memblock_add(base, size);
|
|
}
|
|
|
|
static void __init early_reserve_mem_dt(void)
|
|
{
|
|
unsigned long i, len, dt_root;
|
|
const __be32 *prop;
|
|
|
|
dt_root = of_get_flat_dt_root();
|
|
|
|
prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len);
|
|
|
|
if (!prop)
|
|
return;
|
|
|
|
DBG("Found new-style reserved-ranges\n");
|
|
|
|
/* Each reserved range is an (address,size) pair, 2 cells each,
|
|
* totalling 4 cells per range. */
|
|
for (i = 0; i < len / (sizeof(*prop) * 4); i++) {
|
|
u64 base, size;
|
|
|
|
base = of_read_number(prop + (i * 4) + 0, 2);
|
|
size = of_read_number(prop + (i * 4) + 2, 2);
|
|
|
|
if (size) {
|
|
DBG("reserving: %llx -> %llx\n", base, size);
|
|
memblock_reserve(base, size);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void __init early_reserve_mem(void)
|
|
{
|
|
u64 base, size;
|
|
__be64 *reserve_map;
|
|
unsigned long self_base;
|
|
unsigned long self_size;
|
|
|
|
reserve_map = (__be64 *)(((unsigned long)initial_boot_params) +
|
|
be32_to_cpu(initial_boot_params->off_mem_rsvmap));
|
|
|
|
/* before we do anything, lets reserve the dt blob */
|
|
self_base = __pa((unsigned long)initial_boot_params);
|
|
self_size = be32_to_cpu(initial_boot_params->totalsize);
|
|
memblock_reserve(self_base, self_size);
|
|
|
|
/* Look for the new "reserved-regions" property in the DT */
|
|
early_reserve_mem_dt();
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
/* Then reserve the initrd, if any */
|
|
if (initrd_start && (initrd_end > initrd_start)) {
|
|
memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE),
|
|
_ALIGN_UP(initrd_end, PAGE_SIZE) -
|
|
_ALIGN_DOWN(initrd_start, PAGE_SIZE));
|
|
}
|
|
#endif /* CONFIG_BLK_DEV_INITRD */
|
|
|
|
#ifdef CONFIG_PPC32
|
|
/*
|
|
* Handle the case where we might be booting from an old kexec
|
|
* image that setup the mem_rsvmap as pairs of 32-bit values
|
|
*/
|
|
if (be64_to_cpup(reserve_map) > 0xffffffffull) {
|
|
u32 base_32, size_32;
|
|
__be32 *reserve_map_32 = (__be32 *)reserve_map;
|
|
|
|
DBG("Found old 32-bit reserve map\n");
|
|
|
|
while (1) {
|
|
base_32 = be32_to_cpup(reserve_map_32++);
|
|
size_32 = be32_to_cpup(reserve_map_32++);
|
|
if (size_32 == 0)
|
|
break;
|
|
/* skip if the reservation is for the blob */
|
|
if (base_32 == self_base && size_32 == self_size)
|
|
continue;
|
|
DBG("reserving: %x -> %x\n", base_32, size_32);
|
|
memblock_reserve(base_32, size_32);
|
|
}
|
|
return;
|
|
}
|
|
#endif
|
|
DBG("Processing reserve map\n");
|
|
|
|
/* Handle the reserve map in the fdt blob if it exists */
|
|
while (1) {
|
|
base = be64_to_cpup(reserve_map++);
|
|
size = be64_to_cpup(reserve_map++);
|
|
if (size == 0)
|
|
break;
|
|
DBG("reserving: %llx -> %llx\n", base, size);
|
|
memblock_reserve(base, size);
|
|
}
|
|
}
|
|
|
|
void __init early_init_devtree(void *params)
|
|
{
|
|
phys_addr_t limit;
|
|
|
|
DBG(" -> early_init_devtree(%p)\n", params);
|
|
|
|
/* Setup flat device-tree pointer */
|
|
initial_boot_params = params;
|
|
|
|
#ifdef CONFIG_PPC_RTAS
|
|
/* Some machines might need RTAS info for debugging, grab it now. */
|
|
of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
|
|
#endif
|
|
|
|
#ifdef CONFIG_PPC_POWERNV
|
|
/* Some machines might need OPAL info for debugging, grab it now. */
|
|
of_scan_flat_dt(early_init_dt_scan_opal, NULL);
|
|
#endif
|
|
|
|
#ifdef CONFIG_FA_DUMP
|
|
/* scan tree to see if dump is active during last boot */
|
|
of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL);
|
|
#endif
|
|
|
|
/* Pre-initialize the cmd_line with the content of boot_commmand_line,
|
|
* which will be empty except when the content of the variable has
|
|
* been overriden by a bootloading mechanism. This happens typically
|
|
* with HAL takeover
|
|
*/
|
|
strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
|
|
|
|
/* Retrieve various informations from the /chosen node of the
|
|
* device-tree, including the platform type, initrd location and
|
|
* size, TCE reserve, and more ...
|
|
*/
|
|
of_scan_flat_dt(early_init_dt_scan_chosen_ppc, cmd_line);
|
|
|
|
/* Scan memory nodes and rebuild MEMBLOCKs */
|
|
of_scan_flat_dt(early_init_dt_scan_root, NULL);
|
|
of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
|
|
|
|
/* Save command line for /proc/cmdline and then parse parameters */
|
|
strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
|
|
parse_early_param();
|
|
|
|
/* make sure we've parsed cmdline for mem= before this */
|
|
if (memory_limit)
|
|
first_memblock_size = min_t(u64, first_memblock_size, memory_limit);
|
|
setup_initial_memory_limit(memstart_addr, first_memblock_size);
|
|
/* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */
|
|
memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
|
|
/* If relocatable, reserve first 32k for interrupt vectors etc. */
|
|
if (PHYSICAL_START > MEMORY_START)
|
|
memblock_reserve(MEMORY_START, 0x8000);
|
|
reserve_kdump_trampoline();
|
|
#ifdef CONFIG_FA_DUMP
|
|
/*
|
|
* If we fail to reserve memory for firmware-assisted dump then
|
|
* fallback to kexec based kdump.
|
|
*/
|
|
if (fadump_reserve_mem() == 0)
|
|
#endif
|
|
reserve_crashkernel();
|
|
early_reserve_mem();
|
|
|
|
/*
|
|
* Ensure that total memory size is page-aligned, because otherwise
|
|
* mark_bootmem() gets upset.
|
|
*/
|
|
limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE);
|
|
memblock_enforce_memory_limit(limit);
|
|
|
|
memblock_allow_resize();
|
|
memblock_dump_all();
|
|
|
|
DBG("Phys. mem: %llx\n", memblock_phys_mem_size());
|
|
|
|
/* We may need to relocate the flat tree, do it now.
|
|
* FIXME .. and the initrd too? */
|
|
move_device_tree();
|
|
|
|
allocate_pacas();
|
|
|
|
DBG("Scanning CPUs ...\n");
|
|
|
|
/* Retrieve CPU related informations from the flat tree
|
|
* (altivec support, boot CPU ID, ...)
|
|
*/
|
|
of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
|
|
|
|
#if defined(CONFIG_SMP) && defined(CONFIG_PPC64)
|
|
/* We'll later wait for secondaries to check in; there are
|
|
* NCPUS-1 non-boot CPUs :-)
|
|
*/
|
|
spinning_secondaries = boot_cpu_count - 1;
|
|
#endif
|
|
|
|
DBG(" <- early_init_devtree()\n");
|
|
}
|
|
|
|
/*******
|
|
*
|
|
* New implementation of the OF "find" APIs, return a refcounted
|
|
* object, call of_node_put() when done. The device tree and list
|
|
* are protected by a rw_lock.
|
|
*
|
|
* Note that property management will need some locking as well,
|
|
* this isn't dealt with yet.
|
|
*
|
|
*******/
|
|
|
|
/**
|
|
* of_get_ibm_chip_id - Returns the IBM "chip-id" of a device
|
|
* @np: device node of the device
|
|
*
|
|
* This looks for a property "ibm,chip-id" in the node or any
|
|
* of its parents and returns its content, or -1 if it cannot
|
|
* be found.
|
|
*/
|
|
int of_get_ibm_chip_id(struct device_node *np)
|
|
{
|
|
of_node_get(np);
|
|
while(np) {
|
|
struct device_node *old = np;
|
|
const __be32 *prop;
|
|
|
|
prop = of_get_property(np, "ibm,chip-id", NULL);
|
|
if (prop) {
|
|
of_node_put(np);
|
|
return be32_to_cpup(prop);
|
|
}
|
|
np = of_get_parent(np);
|
|
of_node_put(old);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* cpu_to_chip_id - Return the cpus chip-id
|
|
* @cpu: The logical cpu number.
|
|
*
|
|
* Return the value of the ibm,chip-id property corresponding to the given
|
|
* logical cpu number. If the chip-id can not be found, returns -1.
|
|
*/
|
|
int cpu_to_chip_id(int cpu)
|
|
{
|
|
struct device_node *np;
|
|
|
|
np = of_get_cpu_node(cpu, NULL);
|
|
if (!np)
|
|
return -1;
|
|
|
|
of_node_put(np);
|
|
return of_get_ibm_chip_id(np);
|
|
}
|
|
EXPORT_SYMBOL(cpu_to_chip_id);
|
|
|
|
#ifdef CONFIG_PPC_PSERIES
|
|
/*
|
|
* Fix up the uninitialized fields in a new device node:
|
|
* name, type and pci-specific fields
|
|
*/
|
|
|
|
static int of_finish_dynamic_node(struct device_node *node)
|
|
{
|
|
struct device_node *parent = of_get_parent(node);
|
|
int err = 0;
|
|
const phandle *ibm_phandle;
|
|
|
|
node->name = of_get_property(node, "name", NULL);
|
|
node->type = of_get_property(node, "device_type", NULL);
|
|
|
|
if (!node->name)
|
|
node->name = "<NULL>";
|
|
if (!node->type)
|
|
node->type = "<NULL>";
|
|
|
|
if (!parent) {
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
/* We don't support that function on PowerMac, at least
|
|
* not yet
|
|
*/
|
|
if (machine_is(powermac))
|
|
return -ENODEV;
|
|
|
|
/* fix up new node's phandle field */
|
|
if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL)))
|
|
node->phandle = *ibm_phandle;
|
|
|
|
out:
|
|
of_node_put(parent);
|
|
return err;
|
|
}
|
|
|
|
static int prom_reconfig_notifier(struct notifier_block *nb,
|
|
unsigned long action, void *node)
|
|
{
|
|
int err;
|
|
|
|
switch (action) {
|
|
case OF_RECONFIG_ATTACH_NODE:
|
|
err = of_finish_dynamic_node(node);
|
|
if (err < 0)
|
|
printk(KERN_ERR "finish_node returned %d\n", err);
|
|
break;
|
|
default:
|
|
err = 0;
|
|
break;
|
|
}
|
|
return notifier_from_errno(err);
|
|
}
|
|
|
|
static struct notifier_block prom_reconfig_nb = {
|
|
.notifier_call = prom_reconfig_notifier,
|
|
.priority = 10, /* This one needs to run first */
|
|
};
|
|
|
|
static int __init prom_reconfig_setup(void)
|
|
{
|
|
return of_reconfig_notifier_register(&prom_reconfig_nb);
|
|
}
|
|
__initcall(prom_reconfig_setup);
|
|
#endif
|
|
|
|
bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
|
|
{
|
|
return (int)phys_id == get_hard_smp_processor_id(cpu);
|
|
}
|
|
|
|
#if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
|
|
static struct debugfs_blob_wrapper flat_dt_blob;
|
|
|
|
static int __init export_flat_device_tree(void)
|
|
{
|
|
struct dentry *d;
|
|
|
|
flat_dt_blob.data = initial_boot_params;
|
|
flat_dt_blob.size = be32_to_cpu(initial_boot_params->totalsize);
|
|
|
|
d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
|
|
powerpc_debugfs_root, &flat_dt_blob);
|
|
if (!d)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
__initcall(export_flat_device_tree);
|
|
#endif
|