624 lines
16 KiB
C
624 lines
16 KiB
C
/*
|
|
*
|
|
* Common boot and setup code.
|
|
*
|
|
* Copyright (C) 2001 PPC64 Team, IBM Corp
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#undef DEBUG
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/string.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/initrd.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/console.h>
|
|
#include <linux/utsname.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/root_dev.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/unistd.h>
|
|
#include <linux/serial.h>
|
|
#include <linux/serial_8250.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/lockdep.h>
|
|
#include <linux/lmb.h>
|
|
#include <asm/io.h>
|
|
#include <asm/kdump.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/smp.h>
|
|
#include <asm/elf.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/paca.h>
|
|
#include <asm/time.h>
|
|
#include <asm/cputable.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/btext.h>
|
|
#include <asm/nvram.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/system.h>
|
|
#include <asm/rtas.h>
|
|
#include <asm/iommu.h>
|
|
#include <asm/serial.h>
|
|
#include <asm/cache.h>
|
|
#include <asm/page.h>
|
|
#include <asm/mmu.h>
|
|
#include <asm/firmware.h>
|
|
#include <asm/xmon.h>
|
|
#include <asm/udbg.h>
|
|
#include <asm/kexec.h>
|
|
|
|
#include "setup.h"
|
|
|
|
#ifdef DEBUG
|
|
#define DBG(fmt...) udbg_printf(fmt)
|
|
#else
|
|
#define DBG(fmt...)
|
|
#endif
|
|
|
|
int have_of = 1;
|
|
int boot_cpuid = 0;
|
|
u64 ppc64_pft_size;
|
|
|
|
/* Pick defaults since we might want to patch instructions
|
|
* before we've read this from the device tree.
|
|
*/
|
|
struct ppc64_caches ppc64_caches = {
|
|
.dline_size = 0x40,
|
|
.log_dline_size = 6,
|
|
.iline_size = 0x40,
|
|
.log_iline_size = 6
|
|
};
|
|
EXPORT_SYMBOL_GPL(ppc64_caches);
|
|
|
|
/*
|
|
* These are used in binfmt_elf.c to put aux entries on the stack
|
|
* for each elf executable being started.
|
|
*/
|
|
int dcache_bsize;
|
|
int icache_bsize;
|
|
int ucache_bsize;
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
static int smt_enabled_cmdline;
|
|
|
|
/* Look for ibm,smt-enabled OF option */
|
|
static void check_smt_enabled(void)
|
|
{
|
|
struct device_node *dn;
|
|
const char *smt_option;
|
|
|
|
/* Allow the command line to overrule the OF option */
|
|
if (smt_enabled_cmdline)
|
|
return;
|
|
|
|
dn = of_find_node_by_path("/options");
|
|
|
|
if (dn) {
|
|
smt_option = of_get_property(dn, "ibm,smt-enabled", NULL);
|
|
|
|
if (smt_option) {
|
|
if (!strcmp(smt_option, "on"))
|
|
smt_enabled_at_boot = 1;
|
|
else if (!strcmp(smt_option, "off"))
|
|
smt_enabled_at_boot = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Look for smt-enabled= cmdline option */
|
|
static int __init early_smt_enabled(char *p)
|
|
{
|
|
smt_enabled_cmdline = 1;
|
|
|
|
if (!p)
|
|
return 0;
|
|
|
|
if (!strcmp(p, "on") || !strcmp(p, "1"))
|
|
smt_enabled_at_boot = 1;
|
|
else if (!strcmp(p, "off") || !strcmp(p, "0"))
|
|
smt_enabled_at_boot = 0;
|
|
|
|
return 0;
|
|
}
|
|
early_param("smt-enabled", early_smt_enabled);
|
|
|
|
#else
|
|
#define check_smt_enabled()
|
|
#endif /* CONFIG_SMP */
|
|
|
|
/* Put the paca pointer into r13 and SPRG3 */
|
|
void __init setup_paca(int cpu)
|
|
{
|
|
local_paca = &paca[cpu];
|
|
mtspr(SPRN_SPRG3, local_paca);
|
|
}
|
|
|
|
/*
|
|
* Early initialization entry point. This is called by head.S
|
|
* with MMU translation disabled. We rely on the "feature" of
|
|
* the CPU that ignores the top 2 bits of the address in real
|
|
* mode so we can access kernel globals normally provided we
|
|
* only toy with things in the RMO region. From here, we do
|
|
* some early parsing of the device-tree to setup out LMB
|
|
* data structures, and allocate & initialize the hash table
|
|
* and segment tables so we can start running with translation
|
|
* enabled.
|
|
*
|
|
* It is this function which will call the probe() callback of
|
|
* the various platform types and copy the matching one to the
|
|
* global ppc_md structure. Your platform can eventually do
|
|
* some very early initializations from the probe() routine, but
|
|
* this is not recommended, be very careful as, for example, the
|
|
* device-tree is not accessible via normal means at this point.
|
|
*/
|
|
|
|
void __init early_setup(unsigned long dt_ptr)
|
|
{
|
|
/* -------- printk is _NOT_ safe to use here ! ------- */
|
|
|
|
/* Fill in any unititialised pacas */
|
|
initialise_pacas();
|
|
|
|
/* Identify CPU type */
|
|
identify_cpu(0, mfspr(SPRN_PVR));
|
|
|
|
/* Assume we're on cpu 0 for now. Don't write to the paca yet! */
|
|
setup_paca(0);
|
|
|
|
/* Initialize lockdep early or else spinlocks will blow */
|
|
lockdep_init();
|
|
|
|
/* -------- printk is now safe to use ------- */
|
|
|
|
/* Enable early debugging if any specified (see udbg.h) */
|
|
udbg_early_init();
|
|
|
|
DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr);
|
|
|
|
/*
|
|
* Do early initialization using the flattened device
|
|
* tree, such as retrieving the physical memory map or
|
|
* calculating/retrieving the hash table size.
|
|
*/
|
|
early_init_devtree(__va(dt_ptr));
|
|
|
|
/* Now we know the logical id of our boot cpu, setup the paca. */
|
|
setup_paca(boot_cpuid);
|
|
|
|
/* Fix up paca fields required for the boot cpu */
|
|
get_paca()->cpu_start = 1;
|
|
get_paca()->stab_real = __pa((u64)&initial_stab);
|
|
get_paca()->stab_addr = (u64)&initial_stab;
|
|
|
|
/* Probe the machine type */
|
|
probe_machine();
|
|
|
|
setup_kdump_trampoline();
|
|
|
|
DBG("Found, Initializing memory management...\n");
|
|
|
|
/*
|
|
* Initialize the MMU Hash table and create the linear mapping
|
|
* of memory. Has to be done before stab/slb initialization as
|
|
* this is currently where the page size encoding is obtained
|
|
*/
|
|
htab_initialize();
|
|
|
|
/*
|
|
* Initialize stab / SLB management except on iSeries
|
|
*/
|
|
if (cpu_has_feature(CPU_FTR_SLB))
|
|
slb_initialize();
|
|
else if (!firmware_has_feature(FW_FEATURE_ISERIES))
|
|
stab_initialize(get_paca()->stab_real);
|
|
|
|
DBG(" <- early_setup()\n");
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
void early_setup_secondary(void)
|
|
{
|
|
struct paca_struct *lpaca = get_paca();
|
|
|
|
/* Mark interrupts enabled in PACA */
|
|
lpaca->soft_enabled = 0;
|
|
|
|
/* Initialize hash table for that CPU */
|
|
htab_initialize_secondary();
|
|
|
|
/* Initialize STAB/SLB. We use a virtual address as it works
|
|
* in real mode on pSeries and we want a virutal address on
|
|
* iSeries anyway
|
|
*/
|
|
if (cpu_has_feature(CPU_FTR_SLB))
|
|
slb_initialize();
|
|
else
|
|
stab_initialize(lpaca->stab_addr);
|
|
}
|
|
|
|
#endif /* CONFIG_SMP */
|
|
|
|
#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
|
|
void smp_release_cpus(void)
|
|
{
|
|
extern unsigned long __secondary_hold_spinloop;
|
|
unsigned long *ptr;
|
|
|
|
DBG(" -> smp_release_cpus()\n");
|
|
|
|
/* All secondary cpus are spinning on a common spinloop, release them
|
|
* all now so they can start to spin on their individual paca
|
|
* spinloops. For non SMP kernels, the secondary cpus never get out
|
|
* of the common spinloop.
|
|
* This is useless but harmless on iSeries, secondaries are already
|
|
* waiting on their paca spinloops. */
|
|
|
|
ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
|
|
- PHYSICAL_START);
|
|
*ptr = 1;
|
|
mb();
|
|
|
|
DBG(" <- smp_release_cpus()\n");
|
|
}
|
|
#endif /* CONFIG_SMP || CONFIG_KEXEC */
|
|
|
|
/*
|
|
* Initialize some remaining members of the ppc64_caches and systemcfg
|
|
* structures
|
|
* (at least until we get rid of them completely). This is mostly some
|
|
* cache informations about the CPU that will be used by cache flush
|
|
* routines and/or provided to userland
|
|
*/
|
|
static void __init initialize_cache_info(void)
|
|
{
|
|
struct device_node *np;
|
|
unsigned long num_cpus = 0;
|
|
|
|
DBG(" -> initialize_cache_info()\n");
|
|
|
|
for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
|
|
num_cpus += 1;
|
|
|
|
/* We're assuming *all* of the CPUs have the same
|
|
* d-cache and i-cache sizes... -Peter
|
|
*/
|
|
|
|
if ( num_cpus == 1 ) {
|
|
const u32 *sizep, *lsizep;
|
|
u32 size, lsize;
|
|
|
|
size = 0;
|
|
lsize = cur_cpu_spec->dcache_bsize;
|
|
sizep = of_get_property(np, "d-cache-size", NULL);
|
|
if (sizep != NULL)
|
|
size = *sizep;
|
|
lsizep = of_get_property(np, "d-cache-block-size", NULL);
|
|
/* fallback if block size missing */
|
|
if (lsizep == NULL)
|
|
lsizep = of_get_property(np, "d-cache-line-size", NULL);
|
|
if (lsizep != NULL)
|
|
lsize = *lsizep;
|
|
if (sizep == 0 || lsizep == 0)
|
|
DBG("Argh, can't find dcache properties ! "
|
|
"sizep: %p, lsizep: %p\n", sizep, lsizep);
|
|
|
|
ppc64_caches.dsize = size;
|
|
ppc64_caches.dline_size = lsize;
|
|
ppc64_caches.log_dline_size = __ilog2(lsize);
|
|
ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
|
|
|
|
size = 0;
|
|
lsize = cur_cpu_spec->icache_bsize;
|
|
sizep = of_get_property(np, "i-cache-size", NULL);
|
|
if (sizep != NULL)
|
|
size = *sizep;
|
|
lsizep = of_get_property(np, "i-cache-block-size", NULL);
|
|
if (lsizep == NULL)
|
|
lsizep = of_get_property(np, "i-cache-line-size", NULL);
|
|
if (lsizep != NULL)
|
|
lsize = *lsizep;
|
|
if (sizep == 0 || lsizep == 0)
|
|
DBG("Argh, can't find icache properties ! "
|
|
"sizep: %p, lsizep: %p\n", sizep, lsizep);
|
|
|
|
ppc64_caches.isize = size;
|
|
ppc64_caches.iline_size = lsize;
|
|
ppc64_caches.log_iline_size = __ilog2(lsize);
|
|
ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
|
|
}
|
|
}
|
|
|
|
DBG(" <- initialize_cache_info()\n");
|
|
}
|
|
|
|
|
|
/*
|
|
* Do some initial setup of the system. The parameters are those which
|
|
* were passed in from the bootloader.
|
|
*/
|
|
void __init setup_system(void)
|
|
{
|
|
DBG(" -> setup_system()\n");
|
|
|
|
/* Apply the CPUs-specific and firmware specific fixups to kernel
|
|
* text (nop out sections not relevant to this CPU or this firmware)
|
|
*/
|
|
do_feature_fixups(cur_cpu_spec->cpu_features,
|
|
&__start___ftr_fixup, &__stop___ftr_fixup);
|
|
do_feature_fixups(powerpc_firmware_features,
|
|
&__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
|
|
|
|
/*
|
|
* Unflatten the device-tree passed by prom_init or kexec
|
|
*/
|
|
unflatten_device_tree();
|
|
|
|
/*
|
|
* Fill the ppc64_caches & systemcfg structures with informations
|
|
* retrieved from the device-tree.
|
|
*/
|
|
initialize_cache_info();
|
|
|
|
/*
|
|
* Initialize irq remapping subsystem
|
|
*/
|
|
irq_early_init();
|
|
|
|
#ifdef CONFIG_PPC_RTAS
|
|
/*
|
|
* Initialize RTAS if available
|
|
*/
|
|
rtas_initialize();
|
|
#endif /* CONFIG_PPC_RTAS */
|
|
|
|
/*
|
|
* Check if we have an initrd provided via the device-tree
|
|
*/
|
|
check_for_initrd();
|
|
|
|
/*
|
|
* Do some platform specific early initializations, that includes
|
|
* setting up the hash table pointers. It also sets up some interrupt-mapping
|
|
* related options that will be used by finish_device_tree()
|
|
*/
|
|
if (ppc_md.init_early)
|
|
ppc_md.init_early();
|
|
|
|
/*
|
|
* We can discover serial ports now since the above did setup the
|
|
* hash table management for us, thus ioremap works. We do that early
|
|
* so that further code can be debugged
|
|
*/
|
|
find_legacy_serial_ports();
|
|
|
|
/*
|
|
* Register early console
|
|
*/
|
|
register_early_udbg_console();
|
|
|
|
/*
|
|
* Initialize xmon
|
|
*/
|
|
xmon_setup();
|
|
|
|
check_smt_enabled();
|
|
smp_setup_cpu_maps();
|
|
|
|
#ifdef CONFIG_SMP
|
|
/* Release secondary cpus out of their spinloops at 0x60 now that
|
|
* we can map physical -> logical CPU ids
|
|
*/
|
|
smp_release_cpus();
|
|
#endif
|
|
|
|
printk("Starting Linux PPC64 %s\n", init_utsname()->version);
|
|
|
|
printk("-----------------------------------------------------\n");
|
|
printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size);
|
|
printk("physicalMemorySize = 0x%lx\n", lmb_phys_mem_size());
|
|
if (ppc64_caches.dline_size != 0x80)
|
|
printk("ppc64_caches.dcache_line_size = 0x%x\n",
|
|
ppc64_caches.dline_size);
|
|
if (ppc64_caches.iline_size != 0x80)
|
|
printk("ppc64_caches.icache_line_size = 0x%x\n",
|
|
ppc64_caches.iline_size);
|
|
if (htab_address)
|
|
printk("htab_address = 0x%p\n", htab_address);
|
|
printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
|
|
#if PHYSICAL_START > 0
|
|
printk("physical_start = 0x%lx\n", PHYSICAL_START);
|
|
#endif
|
|
printk("-----------------------------------------------------\n");
|
|
|
|
DBG(" <- setup_system()\n");
|
|
}
|
|
|
|
#ifdef CONFIG_IRQSTACKS
|
|
static void __init irqstack_early_init(void)
|
|
{
|
|
unsigned int i;
|
|
|
|
/*
|
|
* interrupt stacks must be under 256MB, we cannot afford to take
|
|
* SLB misses on them.
|
|
*/
|
|
for_each_possible_cpu(i) {
|
|
softirq_ctx[i] = (struct thread_info *)
|
|
__va(lmb_alloc_base(THREAD_SIZE,
|
|
THREAD_SIZE, 0x10000000));
|
|
hardirq_ctx[i] = (struct thread_info *)
|
|
__va(lmb_alloc_base(THREAD_SIZE,
|
|
THREAD_SIZE, 0x10000000));
|
|
}
|
|
}
|
|
#else
|
|
#define irqstack_early_init()
|
|
#endif
|
|
|
|
/*
|
|
* Stack space used when we detect a bad kernel stack pointer, and
|
|
* early in SMP boots before relocation is enabled.
|
|
*/
|
|
static void __init emergency_stack_init(void)
|
|
{
|
|
unsigned long limit;
|
|
unsigned int i;
|
|
|
|
/*
|
|
* Emergency stacks must be under 256MB, we cannot afford to take
|
|
* SLB misses on them. The ABI also requires them to be 128-byte
|
|
* aligned.
|
|
*
|
|
* Since we use these as temporary stacks during secondary CPU
|
|
* bringup, we need to get at them in real mode. This means they
|
|
* must also be within the RMO region.
|
|
*/
|
|
limit = min(0x10000000UL, lmb.rmo_size);
|
|
|
|
for_each_possible_cpu(i) {
|
|
unsigned long sp;
|
|
sp = lmb_alloc_base(THREAD_SIZE, THREAD_SIZE, limit);
|
|
sp += THREAD_SIZE;
|
|
paca[i].emergency_sp = __va(sp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Called into from start_kernel, after lock_kernel has been called.
|
|
* Initializes bootmem, which is unsed to manage page allocation until
|
|
* mem_init is called.
|
|
*/
|
|
void __init setup_arch(char **cmdline_p)
|
|
{
|
|
ppc64_boot_msg(0x12, "Setup Arch");
|
|
|
|
*cmdline_p = cmd_line;
|
|
|
|
/*
|
|
* Set cache line size based on type of cpu as a default.
|
|
* Systems with OF can look in the properties on the cpu node(s)
|
|
* for a possibly more accurate value.
|
|
*/
|
|
dcache_bsize = ppc64_caches.dline_size;
|
|
icache_bsize = ppc64_caches.iline_size;
|
|
|
|
/* reboot on panic */
|
|
panic_timeout = 180;
|
|
|
|
if (ppc_md.panic)
|
|
setup_panic();
|
|
|
|
init_mm.start_code = (unsigned long)_stext;
|
|
init_mm.end_code = (unsigned long) _etext;
|
|
init_mm.end_data = (unsigned long) _edata;
|
|
init_mm.brk = klimit;
|
|
|
|
irqstack_early_init();
|
|
emergency_stack_init();
|
|
|
|
stabs_alloc();
|
|
|
|
/* set up the bootmem stuff with available memory */
|
|
do_init_bootmem();
|
|
sparse_init();
|
|
|
|
#ifdef CONFIG_DUMMY_CONSOLE
|
|
conswitchp = &dummy_con;
|
|
#endif
|
|
|
|
if (ppc_md.setup_arch)
|
|
ppc_md.setup_arch();
|
|
|
|
paging_init();
|
|
ppc64_boot_msg(0x15, "Setup Done");
|
|
}
|
|
|
|
|
|
/* ToDo: do something useful if ppc_md is not yet setup. */
|
|
#define PPC64_LINUX_FUNCTION 0x0f000000
|
|
#define PPC64_IPL_MESSAGE 0xc0000000
|
|
#define PPC64_TERM_MESSAGE 0xb0000000
|
|
|
|
static void ppc64_do_msg(unsigned int src, const char *msg)
|
|
{
|
|
if (ppc_md.progress) {
|
|
char buf[128];
|
|
|
|
sprintf(buf, "%08X\n", src);
|
|
ppc_md.progress(buf, 0);
|
|
snprintf(buf, 128, "%s", msg);
|
|
ppc_md.progress(buf, 0);
|
|
}
|
|
}
|
|
|
|
/* Print a boot progress message. */
|
|
void ppc64_boot_msg(unsigned int src, const char *msg)
|
|
{
|
|
ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
|
|
printk("[boot]%04x %s\n", src, msg);
|
|
}
|
|
|
|
/* Print a termination message (print only -- does not stop the kernel) */
|
|
void ppc64_terminate_msg(unsigned int src, const char *msg)
|
|
{
|
|
ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
|
|
printk("[terminate]%04x %s\n", src, msg);
|
|
}
|
|
|
|
void cpu_die(void)
|
|
{
|
|
if (ppc_md.cpu_die)
|
|
ppc_md.cpu_die();
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
void __init setup_per_cpu_areas(void)
|
|
{
|
|
int i;
|
|
unsigned long size;
|
|
char *ptr;
|
|
|
|
/* Copy section for each CPU (we discard the original) */
|
|
size = ALIGN(__per_cpu_end - __per_cpu_start, PAGE_SIZE);
|
|
#ifdef CONFIG_MODULES
|
|
if (size < PERCPU_ENOUGH_ROOM)
|
|
size = PERCPU_ENOUGH_ROOM;
|
|
#endif
|
|
|
|
for_each_possible_cpu(i) {
|
|
ptr = alloc_bootmem_pages_node(NODE_DATA(cpu_to_node(i)), size);
|
|
if (!ptr)
|
|
panic("Cannot allocate cpu data for CPU %d\n", i);
|
|
|
|
paca[i].data_offset = ptr - __per_cpu_start;
|
|
memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
|
|
}
|
|
|
|
/* Now that per_cpu is setup, initialize cpu_sibling_map */
|
|
smp_setup_cpu_sibling_map();
|
|
}
|
|
#endif
|
|
|
|
|
|
#ifdef CONFIG_PPC_INDIRECT_IO
|
|
struct ppc_pci_io ppc_pci_io;
|
|
EXPORT_SYMBOL(ppc_pci_io);
|
|
#endif /* CONFIG_PPC_INDIRECT_IO */
|
|
|