Commit 951bc82c authored by David S. Miller's avatar David S. Miller

[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: default avatarDavid S. Miller <davem@davemloft.net>
parent e6ed89ac
...@@ -10,6 +10,7 @@ ...@@ -10,6 +10,7 @@
#include <linux/config.h> #include <linux/config.h>
#include <linux/version.h> #include <linux/version.h>
#include <linux/errno.h> #include <linux/errno.h>
#include <linux/threads.h>
#include <asm/thread_info.h> #include <asm/thread_info.h>
#include <asm/asi.h> #include <asm/asi.h>
#include <asm/pstate.h> #include <asm/pstate.h>
...@@ -493,6 +494,35 @@ tlb_fixup_done: ...@@ -493,6 +494,35 @@ tlb_fixup_done:
call prom_init call prom_init
mov %l7, %o0 ! OpenPROM cif handler 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.... */ /* Off we go.... */
call start_kernel call start_kernel
nop nop
......
...@@ -220,7 +220,7 @@ char reboot_command[COMMAND_LINE_SIZE]; ...@@ -220,7 +220,7 @@ char reboot_command[COMMAND_LINE_SIZE];
static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 }; 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; struct cpuid_patch_entry *p;
unsigned long ver; unsigned long ver;
...@@ -280,7 +280,7 @@ static void __init per_cpu_patch(void) ...@@ -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_1insn_patch_entry *p1;
struct sun4v_2insn_patch_entry *p2; struct sun4v_2insn_patch_entry *p2;
...@@ -315,6 +315,15 @@ static void __init sun4v_patch(void) ...@@ -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) void __init setup_arch(char **cmdline_p)
{ {
/* Initialize PROM console and command line. */ /* Initialize PROM console and command line. */
...@@ -332,16 +341,6 @@ void __init setup_arch(char **cmdline_p) ...@@ -332,16 +341,6 @@ void __init setup_arch(char **cmdline_p)
conswitchp = &prom_con; conswitchp = &prom_con;
#endif #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); boot_flags_init(*cmdline_p);
idprom_init(); idprom_init();
......
...@@ -1264,7 +1264,6 @@ void __init smp_tick_init(void) ...@@ -1264,7 +1264,6 @@ void __init smp_tick_init(void)
boot_cpu_id = hard_smp_processor_id(); boot_cpu_id = hard_smp_processor_id();
current_tick_offset = timer_tick_offset; 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; prof_counter(boot_cpu_id) = prof_multiplier(boot_cpu_id) = 1;
} }
...@@ -1345,18 +1344,6 @@ void __init smp_setup_cpu_possible_map(void) ...@@ -1345,18 +1344,6 @@ void __init smp_setup_cpu_possible_map(void)
void __devinit smp_prepare_boot_cpu(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) int __devinit __cpu_up(unsigned int cpu)
...@@ -1433,4 +1420,7 @@ void __init setup_per_cpu_areas(void) ...@@ -1433,4 +1420,7 @@ void __init setup_per_cpu_areas(void)
for (i = 0; i < NR_CPUS; i++, ptr += size) for (i = 0; i < NR_CPUS; i++, ptr += size)
memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); 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());
} }
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