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kernel-ark/arch/sparc/kernel/setup.c
David S. Miller c73fcc846c [SPARC]: Fix serial console device detection. 
The current scheme works on static interpretation of text names, which
is wrong.

The output-device setting, for example, must be resolved via an alias
or similar to a full path name to the console device.

Paths also contain an optional set of 'options', which starts with a
colon at the end of the path.  The option area is used to specify
which of two serial ports ('a' or 'b') the path refers to when a
device node drives multiple ports.  'a' is assumed if the option
specification is missing.

This was caught by the UltraSPARC-T1 simulator.  The 'output-device'
property was set to 'ttya' and we didn't pick upon the fact that this
is an OBP alias set to '/virtual-devices/console'.  Instead we saw it
as the first serial console device, instead of the hypervisor console.

The infrastructure is now there to take advantage of this to resolve
the console correctly even in multi-head situations in fbcon too.

Thanks to Greg Onufer for the bug report.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-20 16:59:26 -07:00

430 lines
9.6 KiB
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/* $Id: setup.c,v 1.126 2001/11/13 00:49:27 davem Exp $
* linux/arch/sparc/kernel/setup.c
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 2000 Anton Blanchard (anton@samba.org)
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/initrd.h>
#include <asm/smp.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/screen_info.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/syscalls.h>
#include <linux/kdev_t.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/console.h>
#include <linux/spinlock.h>
#include <linux/root_dev.h>
#include <linux/cpu.h>
#include <linux/kdebug.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/oplib.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/traps.h>
#include <asm/vaddrs.h>
#include <asm/mbus.h>
#include <asm/idprom.h>
#include <asm/machines.h>
#include <asm/cpudata.h>
#include <asm/setup.h>
struct screen_info screen_info = {
0, 0, /* orig-x, orig-y */
0, /* unused */
0, /* orig-video-page */
0, /* orig-video-mode */
128, /* orig-video-cols */
0,0,0, /* ega_ax, ega_bx, ega_cx */
54, /* orig-video-lines */
0, /* orig-video-isVGA */
16 /* orig-video-points */
};
/* Typing sync at the prom prompt calls the function pointed to by
* romvec->pv_synchook which I set to the following function.
* This should sync all filesystems and return, for now it just
* prints out pretty messages and returns.
*/
extern unsigned long trapbase;
void (*prom_palette)(int);
/* Pretty sick eh? */
void prom_sync_me(void)
{
unsigned long prom_tbr, flags;
/* XXX Badly broken. FIX! - Anton */
local_irq_save(flags);
__asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
__asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t" : : "r" (&trapbase));
if (prom_palette)
prom_palette(1);
prom_printf("PROM SYNC COMMAND...\n");
show_free_areas();
if(current->pid != 0) {
local_irq_enable();
sys_sync();
local_irq_disable();
}
prom_printf("Returning to prom\n");
__asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t" : : "r" (prom_tbr));
local_irq_restore(flags);
return;
}
unsigned int boot_flags __initdata = 0;
#define BOOTME_DEBUG 0x1
/* Exported for mm/init.c:paging_init. */
unsigned long cmdline_memory_size __initdata = 0;
static void
prom_console_write(struct console *con, const char *s, unsigned n)
{
prom_write(s, n);
}
static struct console prom_debug_console = {
.name = "debug",
.write = prom_console_write,
.flags = CON_PRINTBUFFER,
.index = -1,
};
/*
* Process kernel command line switches that are specific to the
* SPARC or that require special low-level processing.
*/
static void __init process_switch(char c)
{
switch (c) {
case 'd':
boot_flags |= BOOTME_DEBUG;
break;
case 's':
break;
case 'h':
prom_printf("boot_flags_init: Halt!\n");
prom_halt();
break;
case 'p':
/* Use PROM debug console. */
register_console(&prom_debug_console);
break;
default:
printk("Unknown boot switch (-%c)\n", c);
break;
}
}
static void __init boot_flags_init(char *commands)
{
while (*commands) {
/* Move to the start of the next "argument". */
while (*commands && *commands == ' ')
commands++;
/* Process any command switches, otherwise skip it. */
if (*commands == '\0')
break;
if (*commands == '-') {
commands++;
while (*commands && *commands != ' ')
process_switch(*commands++);
continue;
}
if (!strncmp(commands, "mem=", 4)) {
/*
* "mem=XXX[kKmM] overrides the PROM-reported
* memory size.
*/
cmdline_memory_size = simple_strtoul(commands + 4,
&commands, 0);
if (*commands == 'K' || *commands == 'k') {
cmdline_memory_size <<= 10;
commands++;
} else if (*commands=='M' || *commands=='m') {
cmdline_memory_size <<= 20;
commands++;
}
}
while (*commands && *commands != ' ')
commands++;
}
}
/* This routine will in the future do all the nasty prom stuff
* to probe for the mmu type and its parameters, etc. This will
* also be where SMP things happen plus the Sparc specific memory
* physical memory probe as on the alpha.
*/
extern int prom_probe_memory(void);
extern void sun4c_probe_vac(void);
extern char cputypval;
extern unsigned long start, end;
extern void panic_setup(char *, int *);
extern unsigned short root_flags;
extern unsigned short root_dev;
extern unsigned short ram_flags;
#define RAMDISK_IMAGE_START_MASK 0x07FF
#define RAMDISK_PROMPT_FLAG 0x8000
#define RAMDISK_LOAD_FLAG 0x4000
extern int root_mountflags;
char reboot_command[COMMAND_LINE_SIZE];
enum sparc_cpu sparc_cpu_model;
struct tt_entry *sparc_ttable;
struct pt_regs fake_swapper_regs;
void __init setup_arch(char **cmdline_p)
{
int i;
unsigned long highest_paddr;
sparc_ttable = (struct tt_entry *) &start;
/* Initialize PROM console and command line. */
*cmdline_p = prom_getbootargs();
strcpy(boot_command_line, *cmdline_p);
/* Set sparc_cpu_model */
sparc_cpu_model = sun_unknown;
if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; } /* CP-1200 with PROM 2.30 -E */
if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
#ifdef CONFIG_SUN4
if (sparc_cpu_model != sun4) {
prom_printf("This kernel is for Sun4 architecture only.\n");
prom_halt();
}
#endif
printk("ARCH: ");
switch(sparc_cpu_model) {
case sun4:
printk("SUN4\n");
break;
case sun4c:
printk("SUN4C\n");
break;
case sun4m:
printk("SUN4M\n");
break;
case sun4d:
printk("SUN4D\n");
break;
case sun4e:
printk("SUN4E\n");
break;
case sun4u:
printk("SUN4U\n");
break;
default:
printk("UNKNOWN!\n");
break;
};
#ifdef CONFIG_DUMMY_CONSOLE
conswitchp = &dummy_con;
#elif defined(CONFIG_PROM_CONSOLE)
conswitchp = &prom_con;
#endif
boot_flags_init(*cmdline_p);
idprom_init();
if (ARCH_SUN4C_SUN4)
sun4c_probe_vac();
load_mmu();
(void) prom_probe_memory();
phys_base = 0xffffffffUL;
highest_paddr = 0UL;
for (i = 0; sp_banks[i].num_bytes != 0; i++) {
unsigned long top;
if (sp_banks[i].base_addr < phys_base)
phys_base = sp_banks[i].base_addr;
top = sp_banks[i].base_addr +
sp_banks[i].num_bytes;
if (highest_paddr < top)
highest_paddr = top;
}
pfn_base = phys_base >> PAGE_SHIFT;
if (!root_flags)
root_mountflags &= ~MS_RDONLY;
ROOT_DEV = old_decode_dev(root_dev);
#ifdef CONFIG_BLK_DEV_RAM
rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
#endif
prom_setsync(prom_sync_me);
if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
((*(short *)linux_dbvec) != -1)) {
printk("Booted under KADB. Syncing trap table.\n");
(*(linux_dbvec->teach_debugger))();
}
init_mm.context = (unsigned long) NO_CONTEXT;
init_task.thread.kregs = &fake_swapper_regs;
paging_init();
smp_setup_cpu_possible_map();
}
extern char *sparc_cpu_type;
extern char *sparc_fpu_type;
static int ncpus_probed;
static int show_cpuinfo(struct seq_file *m, void *__unused)
{
seq_printf(m,
"cpu\t\t: %s\n"
"fpu\t\t: %s\n"
"promlib\t\t: Version %d Revision %d\n"
"prom\t\t: %d.%d\n"
"type\t\t: %s\n"
"ncpus probed\t: %d\n"
"ncpus active\t: %d\n"
#ifndef CONFIG_SMP
"CPU0Bogo\t: %lu.%02lu\n"
"CPU0ClkTck\t: %ld\n"
#endif
,
sparc_cpu_type ? sparc_cpu_type : "undetermined",
sparc_fpu_type ? sparc_fpu_type : "undetermined",
romvec->pv_romvers,
prom_rev,
romvec->pv_printrev >> 16,
romvec->pv_printrev & 0xffff,
&cputypval,
ncpus_probed,
num_online_cpus()
#ifndef CONFIG_SMP
, cpu_data(0).udelay_val/(500000/HZ),
(cpu_data(0).udelay_val/(5000/HZ)) % 100,
cpu_data(0).clock_tick
#endif
);
#ifdef CONFIG_SMP
smp_bogo(m);
#endif
mmu_info(m);
#ifdef CONFIG_SMP
smp_info(m);
#endif
return 0;
}
static void *c_start(struct seq_file *m, loff_t *pos)
{
/* The pointer we are returning is arbitrary,
* it just has to be non-NULL and not IS_ERR
* in the success case.
*/
return *pos == 0 ? &c_start : 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,
};
extern int stop_a_enabled;
void sun_do_break(void)
{
if (!stop_a_enabled)
return;
printk("\n");
flush_user_windows();
prom_cmdline();
}
int stop_a_enabled = 1;
static int __init topology_init(void)
{
int i, ncpus, err;
/* Count the number of physically present processors in
* the machine, even on uniprocessor, so that /proc/cpuinfo
* output is consistent with 2.4.x
*/
ncpus = 0;
while (!cpu_find_by_instance(ncpus, NULL, NULL))
ncpus++;
ncpus_probed = ncpus;
err = 0;
for_each_online_cpu(i) {
struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
if (!p)
err = -ENOMEM;
else
register_cpu(p, i);
}
return err;
}
subsys_initcall(topology_init);
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