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[SPARC64]: Make smp_processor_id() functional before start_kernel() 

Uses of smp_processor_id() get pushed earlier and earlier in
the start_kernel() sequence.  So just get it working before
we call start_kernel() to avoid all possible problems.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2006-05-31 01:24:02 -07:00
parent e6ed89ac9f
commit 951bc82c53
3 changed files with 44 additions and 25 deletions
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30
arch/sparc64/kernel/head.S
View File

@ -10,6 +10,7 @@
#include <linux/config.h>
#include <linux/version.h>
#include <linux/errno.h>
#include <linux/threads.h>
#include <asm/thread_info.h>
#include <asm/asi.h>
#include <asm/pstate.h>
@ -493,6 +494,35 @@ tlb_fixup_done:
call prom_init
mov %l7, %o0 ! OpenPROM cif handler
/* Initialize current_thread_info()->cpu as early as possible.
* In order to do that accurately we have to patch up the get_cpuid()
* assembler sequences. And that, in turn, requires that we know
* if we are on a Starfire box or not. While we're here, patch up
* the sun4v sequences as well.
*/
call check_if_starfire
nop
call per_cpu_patch
nop
call sun4v_patch
nop
#ifdef CONFIG_SMP
call hard_smp_processor_id
nop
cmp %o0, NR_CPUS
blu,pt %xcc, 1f
nop
call boot_cpu_id_too_large
nop
/* Not reached... */
1:
#else
mov 0, %o0
#endif
stb %o0, [%g6 + TI_CPU]
/* Off we go.... */
call start_kernel
nop

23
arch/sparc64/kernel/setup.c
View File

@ -220,7 +220,7 @@ char reboot_command[COMMAND_LINE_SIZE];
static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };
static void __init per_cpu_patch(void)
void __init per_cpu_patch(void)
{
struct cpuid_patch_entry *p;
unsigned long ver;
@ -280,7 +280,7 @@ static void __init per_cpu_patch(void)
}
}
static void __init sun4v_patch(void)
void __init sun4v_patch(void)
{
struct sun4v_1insn_patch_entry *p1;
struct sun4v_2insn_patch_entry *p2;
@ -315,6 +315,15 @@ static void __init sun4v_patch(void)
}
}
#ifdef CONFIG_SMP
void __init boot_cpu_id_too_large(int cpu)
{
prom_printf("Serious problem, boot cpu id (%d) >= NR_CPUS (%d)\n",
cpu, NR_CPUS);
prom_halt();
}
#endif
void __init setup_arch(char **cmdline_p)
{
/* Initialize PROM console and command line. */
@ -332,16 +341,6 @@ void __init setup_arch(char **cmdline_p)
conswitchp = &prom_con;
#endif
/* Work out if we are starfire early on */
check_if_starfire();
/* Now we know enough to patch the get_cpuid sequences
* used by trap code.
*/
per_cpu_patch();
sun4v_patch();
boot_flags_init(*cmdline_p);
idprom_init();

16
arch/sparc64/kernel/smp.c
View File

@ -1264,7 +1264,6 @@ void __init smp_tick_init(void)
boot_cpu_id = hard_smp_processor_id();
current_tick_offset = timer_tick_offset;
cpu_set(boot_cpu_id, cpu_online_map);
prof_counter(boot_cpu_id) = prof_multiplier(boot_cpu_id) = 1;
}
@ -1345,18 +1344,6 @@ void __init smp_setup_cpu_possible_map(void)
void __devinit smp_prepare_boot_cpu(void)
{
int cpu = hard_smp_processor_id();
if (cpu >= NR_CPUS) {
prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
prom_halt();
}
current_thread_info()->cpu = cpu;
__local_per_cpu_offset = __per_cpu_offset(cpu);
cpu_set(smp_processor_id(), cpu_online_map);
cpu_set(smp_processor_id(), phys_cpu_present_map);
}
int __devinit __cpu_up(unsigned int cpu)
@ -1433,4 +1420,7 @@ void __init setup_per_cpu_areas(void)
for (i = 0; i < NR_CPUS; i++, ptr += size)
memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
/* Setup %g5 for the boot cpu. */
__local_per_cpu_offset = __per_cpu_offset(smp_processor_id());
}