diff options
| author | Daniel Hellstrom <daniel@gaisler.com> | 2011-04-21 04:20:23 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-04-21 16:44:44 -0700 |
| commit | 5fcafb7a23e35b2f1a5243f4dd536240f52c8ceb (patch) | |
| tree | f3967b2d935e2e492d55ec80d69c3437750cdde0 /arch/sparc/kernel/head_32.S | |
| parent | 1827237065815373421c087c84d2a779d61c13d3 (diff) | |
sparc32: always define boot_cpu_id
Define boot_cpu_id in single-processor kernels as well. This is
to support architectures which can boot on other than CPU0.
Sam Ravnborg has written the cleanup parts by extracting
boot_cpu_id from smp_32.c into setup_32.c and cleaned up
sun4d_irq.c.
boot_cpu_id was initialized before BSS was cleared in
sun4c_continue_boot, instead boot_cpu_id is set to 0xff to
avoid BSS. If boot_cpu_id is untouched (0xff) by bootup code
it will be overwritten to 0. boot_cpu_id4 is automatically
calculated in common code.
Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/kernel/head_32.S')
| -rw-r--r-- | arch/sparc/kernel/head_32.S | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/arch/sparc/kernel/head_32.S b/arch/sparc/kernel/head_32.S index 59423491cef..520c615d376 100644 --- a/arch/sparc/kernel/head_32.S +++ b/arch/sparc/kernel/head_32.S @@ -816,10 +816,7 @@ got_prop: .global leon_smp_init leon_smp_init: - sethi %hi(boot_cpu_id), %g1 ! master always 0 - stb %g0, [%g1 + %lo(boot_cpu_id)] - sethi %hi(boot_cpu_id4), %g1 ! master always 0 - stb %g0, [%g1 + %lo(boot_cpu_id4)] + /* let boot_cpu_id default to 0 (master always 0) */ rd %asr17,%g1 srl %g1,28,%g1 @@ -893,9 +890,6 @@ sun4d_init: sta %g4, [%g0] ASI_M_VIKING_TMP1 sethi %hi(boot_cpu_id), %g5 stb %g4, [%g5 + %lo(boot_cpu_id)] - sll %g4, 2, %g4 - sethi %hi(boot_cpu_id4), %g5 - stb %g4, [%g5 + %lo(boot_cpu_id4)] #endif /* Fall through to sun4m_init */ @@ -1024,14 +1018,28 @@ sun4c_continue_boot: bl 1b add %o0, 0x1, %o0 + /* If boot_cpu_id has not been setup by machine specific + * init-code above we default it to zero. + */ + sethi %hi(boot_cpu_id), %g2 + ldub [%g2 + %lo(boot_cpu_id)], %g3 + cmp %g3, 0xff + bne 1f + nop + mov %g0, %g3 + stub %g3, [%g2 + %lo(boot_cpu_id)] + +1: /* boot_cpu_id set. calculate boot_cpu_id4 = boot_cpu_id*4 */ + sll %g3, 2, %g3 + sethi %hi(boot_cpu_id4), %g2 + stub %g3, [%g2 + %lo(boot_cpu_id4)] + /* Initialize the uwinmask value for init task just in case. * But first make current_set[boot_cpu_id] point to something useful. */ set init_thread_union, %g6 set current_set, %g2 #ifdef CONFIG_SMP - sethi %hi(boot_cpu_id4), %g3 - ldub [%g3 + %lo(boot_cpu_id4)], %g3 st %g6, [%g2] add %g2, %g3, %g2 #endif |