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kernel-ark/arch/powerpc/kernel/setup-common.c
Anton Blanchard 4df20460a3 [PATCH] powerpc: Allow non zero boot cpuids 
We currently have a hack to flip the boot cpu and its secondary thread
to logical cpuid 0 and 1. This means the logical - physical mapping will
differ depending on which cpu is boot cpu. This is most apparent on
kexec, where we might kexec on any cpu and therefore change the mapping
from boot to boot.

The patch below does a first pass early on to work out the logical cpuid
of the boot thread. We then fix up some paca structures to match.

Ive also removed the boot_cpuid_phys variable for ppc64, to be
consistent we use get_hard_smp_processor_id(boot_cpuid) everywhere.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2006-03-27 14:48:48 +11:00

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/*
* Common boot and setup code for both 32-bit and 64-bit.
* Extracted from arch/powerpc/kernel/setup_64.c.
*
* 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.
*/
#include <linux/config.h>
#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/ide.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 <asm/io.h>
#include <asm/prom.h>
#include <asm/processor.h>
#include <asm/vdso_datapage.h>
#include <asm/pgtable.h>
#include <asm/smp.h>
#include <asm/elf.h>
#include <asm/machdep.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/lmb.h>
#include <asm/xmon.h>
#include "setup.h"
#undef DEBUG
#ifdef DEBUG
#include <asm/udbg.h>
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...)
#endif
#ifdef CONFIG_PPC_MULTIPLATFORM
int _machine = 0;
EXPORT_SYMBOL(_machine);
#endif
unsigned long klimit = (unsigned long) _end;
/*
* This still seems to be needed... -- paulus
*/
struct screen_info screen_info = {
.orig_x = 0,
.orig_y = 25,
.orig_video_cols = 80,
.orig_video_lines = 25,
.orig_video_isVGA = 1,
.orig_video_points = 16
};
#ifdef __DO_IRQ_CANON
/* XXX should go elsewhere eventually */
int ppc_do_canonicalize_irqs;
EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
#endif
/* also used by kexec */
void machine_shutdown(void)
{
if (ppc_md.machine_shutdown)
ppc_md.machine_shutdown();
}
void machine_restart(char *cmd)
{
machine_shutdown();
if (ppc_md.restart)
ppc_md.restart(cmd);
#ifdef CONFIG_SMP
smp_send_stop();
#endif
printk(KERN_EMERG "System Halted, OK to turn off power\n");
local_irq_disable();
while (1) ;
}
void machine_power_off(void)
{
machine_shutdown();
if (ppc_md.power_off)
ppc_md.power_off();
#ifdef CONFIG_SMP
smp_send_stop();
#endif
printk(KERN_EMERG "System Halted, OK to turn off power\n");
local_irq_disable();
while (1) ;
}
/* Used by the G5 thermal driver */
EXPORT_SYMBOL_GPL(machine_power_off);
void (*pm_power_off)(void) = machine_power_off;
EXPORT_SYMBOL_GPL(pm_power_off);
void machine_halt(void)
{
machine_shutdown();
if (ppc_md.halt)
ppc_md.halt();
#ifdef CONFIG_SMP
smp_send_stop();
#endif
printk(KERN_EMERG "System Halted, OK to turn off power\n");
local_irq_disable();
while (1) ;
}
#ifdef CONFIG_TAU
extern u32 cpu_temp(unsigned long cpu);
extern u32 cpu_temp_both(unsigned long cpu);
#endif /* CONFIG_TAU */
#ifdef CONFIG_SMP
DEFINE_PER_CPU(unsigned int, pvr);
#endif
static int show_cpuinfo(struct seq_file *m, void *v)
{
unsigned long cpu_id = (unsigned long)v - 1;
unsigned int pvr;
unsigned short maj;
unsigned short min;
if (cpu_id == NR_CPUS) {
#if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
unsigned long bogosum = 0;
int i;
for_each_online_cpu(i)
bogosum += loops_per_jiffy;
seq_printf(m, "total bogomips\t: %lu.%02lu\n",
bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
#endif /* CONFIG_SMP && CONFIG_PPC32 */
seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
if (ppc_md.show_cpuinfo != NULL)
ppc_md.show_cpuinfo(m);
return 0;
}
/* We only show online cpus: disable preempt (overzealous, I
* knew) to prevent cpu going down. */
preempt_disable();
if (!cpu_online(cpu_id)) {
preempt_enable();
return 0;
}
#ifdef CONFIG_SMP
pvr = per_cpu(pvr, cpu_id);
#else
pvr = mfspr(SPRN_PVR);
#endif
maj = (pvr >> 8) & 0xFF;
min = pvr & 0xFF;
seq_printf(m, "processor\t: %lu\n", cpu_id);
seq_printf(m, "cpu\t\t: ");
if (cur_cpu_spec->pvr_mask)
seq_printf(m, "%s", cur_cpu_spec->cpu_name);
else
seq_printf(m, "unknown (%08x)", pvr);
#ifdef CONFIG_ALTIVEC
if (cpu_has_feature(CPU_FTR_ALTIVEC))
seq_printf(m, ", altivec supported");
#endif /* CONFIG_ALTIVEC */
seq_printf(m, "\n");
#ifdef CONFIG_TAU
if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
#ifdef CONFIG_TAU_AVERAGE
/* more straightforward, but potentially misleading */
seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
cpu_temp(cpu_id));
#else
/* show the actual temp sensor range */
u32 temp;
temp = cpu_temp_both(cpu_id);
seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
temp & 0xff, temp >> 16);
#endif
}
#endif /* CONFIG_TAU */
/*
* Assume here that all clock rates are the same in a
* smp system. -- Cort
*/
if (ppc_proc_freq)
seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
if (ppc_md.show_percpuinfo != NULL)
ppc_md.show_percpuinfo(m, cpu_id);
/* If we are a Freescale core do a simple check so
* we dont have to keep adding cases in the future */
if (PVR_VER(pvr) & 0x8000) {
maj = PVR_MAJ(pvr);
min = PVR_MIN(pvr);
} else {
switch (PVR_VER(pvr)) {
case 0x0020: /* 403 family */
maj = PVR_MAJ(pvr) + 1;
min = PVR_MIN(pvr);
break;
case 0x1008: /* 740P/750P ?? */
maj = ((pvr >> 8) & 0xFF) - 1;
min = pvr & 0xFF;
break;
default:
maj = (pvr >> 8) & 0xFF;
min = pvr & 0xFF;
break;
}
}
seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
maj, min, PVR_VER(pvr), PVR_REV(pvr));
#ifdef CONFIG_PPC32
seq_printf(m, "bogomips\t: %lu.%02lu\n",
loops_per_jiffy / (500000/HZ),
(loops_per_jiffy / (5000/HZ)) % 100);
#endif
#ifdef CONFIG_SMP
seq_printf(m, "\n");
#endif
preempt_enable();
return 0;
}
static void *c_start(struct seq_file *m, loff_t *pos)
{
unsigned long i = *pos;
return i <= NR_CPUS ? (void *)(i + 1) : NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
++*pos;
return c_start(m, pos);
}
static void c_stop(struct seq_file *m, void *v)
{
}
struct seq_operations cpuinfo_op = {
.start =c_start,
.next = c_next,
.stop = c_stop,
.show = show_cpuinfo,
};
void __init check_for_initrd(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
unsigned long *prop;
DBG(" -> check_for_initrd()\n");
if (of_chosen) {
prop = (unsigned long *)get_property(of_chosen,
"linux,initrd-start", NULL);
if (prop != NULL) {
initrd_start = (unsigned long)__va(*prop);
prop = (unsigned long *)get_property(of_chosen,
"linux,initrd-end", NULL);
if (prop != NULL) {
initrd_end = (unsigned long)__va(*prop);
initrd_below_start_ok = 1;
} else
initrd_start = 0;
}
}
/* If we were passed an initrd, set the ROOT_DEV properly if the values
* look sensible. If not, clear initrd reference.
*/
if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
initrd_end > initrd_start)
ROOT_DEV = Root_RAM0;
else
initrd_start = initrd_end = 0;
if (initrd_start)
printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
DBG(" <- check_for_initrd()\n");
#endif /* CONFIG_BLK_DEV_INITRD */
}
#ifdef CONFIG_SMP
/**
* setup_cpu_maps - initialize the following cpu maps:
* cpu_possible_map
* cpu_present_map
* cpu_sibling_map
*
* Having the possible map set up early allows us to restrict allocations
* of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
*
* We do not initialize the online map here; cpus set their own bits in
* cpu_online_map as they come up.
*
* This function is valid only for Open Firmware systems. finish_device_tree
* must be called before using this.
*
* While we're here, we may as well set the "physical" cpu ids in the paca.
*
* NOTE: This must match the parsing done in early_init_dt_scan_cpus.
*/
void __init smp_setup_cpu_maps(void)
{
struct device_node *dn = NULL;
int cpu = 0;
while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
int *intserv;
int j, len = sizeof(u32), nthreads = 1;
intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
&len);
if (intserv)
nthreads = len / sizeof(int);
else {
intserv = (int *) get_property(dn, "reg", NULL);
if (!intserv)
intserv = &cpu; /* assume logical == phys */
}
for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
cpu_set(cpu, cpu_present_map);
set_hard_smp_processor_id(cpu, intserv[j]);
cpu_set(cpu, cpu_possible_map);
cpu++;
}
}
#ifdef CONFIG_PPC64
/*
* On pSeries LPAR, we need to know how many cpus
* could possibly be added to this partition.
*/
if (_machine == PLATFORM_PSERIES_LPAR &&
(dn = of_find_node_by_path("/rtas"))) {
int num_addr_cell, num_size_cell, maxcpus;
unsigned int *ireg;
num_addr_cell = prom_n_addr_cells(dn);
num_size_cell = prom_n_size_cells(dn);
ireg = (unsigned int *)
get_property(dn, "ibm,lrdr-capacity", NULL);
if (!ireg)
goto out;
maxcpus = ireg[num_addr_cell + num_size_cell];
/* Double maxcpus for processors which have SMT capability */
if (cpu_has_feature(CPU_FTR_SMT))
maxcpus *= 2;
if (maxcpus > NR_CPUS) {
printk(KERN_WARNING
"Partition configured for %d cpus, "
"operating system maximum is %d.\n",
maxcpus, NR_CPUS);
maxcpus = NR_CPUS;
} else
printk(KERN_INFO "Partition configured for %d cpus.\n",
maxcpus);
for (cpu = 0; cpu < maxcpus; cpu++)
cpu_set(cpu, cpu_possible_map);
out:
of_node_put(dn);
}
/*
* Do the sibling map; assume only two threads per processor.
*/
for_each_cpu(cpu) {
cpu_set(cpu, cpu_sibling_map[cpu]);
if (cpu_has_feature(CPU_FTR_SMT))
cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
}
vdso_data->processorCount = num_present_cpus();
#endif /* CONFIG_PPC64 */
}
#endif /* CONFIG_SMP */
#ifdef CONFIG_XMON
static int __init early_xmon(char *p)
{
/* ensure xmon is enabled */
if (p) {
if (strncmp(p, "on", 2) == 0)
xmon_init(1);
if (strncmp(p, "off", 3) == 0)
xmon_init(0);
if (strncmp(p, "early", 5) != 0)
return 0;
}
xmon_init(1);
debugger(NULL);
return 0;
}
early_param("xmon", early_xmon);
#endif
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