diff options
| author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-07 10:21:26 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-07 10:21:26 -0800 |
| commit | 0afc2edfada50980bec999f94dcea26ebad3dda6 (patch) | |
| tree | 8963dd8fd78ee5c3481acad5903bc459bd3d055c /arch/sparc64/kernel/head.S | |
| parent | a8e98d6d51a3eb7bb061b1625193a129c8bd094f (diff) | |
| parent | d256eb8db60e36fc5dd0a27ce8a64f65df31f7b5 (diff) | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
[SPARC32]: Use regsets in arch_ptrace().
[SPARC64]: Use regsets in arch_ptrace().
[SPARC32]: Use regsets for ELF core dumping.
[SPARC64]: Use regsets for ELF core dumping.
[SPARC64]: Remove unintentional ptrace debugging messages.
[SPARC]: Move over to arch_ptrace().
[SPARC]: Remove PTRACE_SUN* handling.
[SPARC]: Kill DEBUG_PTRACE code.
[SPARC32]: Add user regset support.
[SPARC64]: Add user regsets.
[SPARC64]: Fix booting on non-zero cpu.
Diffstat (limited to 'arch/sparc64/kernel/head.S')
| -rw-r--r-- | arch/sparc64/kernel/head.S | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/head.S b/arch/sparc64/kernel/head.S index c4147ad8677..44b105c04dd 100644 --- a/arch/sparc64/kernel/head.S +++ b/arch/sparc64/kernel/head.S @@ -632,11 +632,36 @@ tlb_fixup_done: /* Not reached... */ 1: + /* If we boot on a non-zero cpu, all of the per-cpu + * variable references we make before setting up the + * per-cpu areas will use a bogus offset. Put a + * compensating factor into __per_cpu_base to handle + * this cleanly. + * + * What the per-cpu code calculates is: + * + * __per_cpu_base + (cpu << __per_cpu_shift) + * + * These two variables are zero initially, so to + * make it all cancel out to zero we need to put + * "0 - (cpu << 0)" into __per_cpu_base so that the + * above formula evaluates to zero. + * + * We cannot even perform a printk() until this stuff + * is setup as that calls cpu_clock() which uses + * per-cpu variables. + */ + sub %g0, %o0, %o1 + sethi %hi(__per_cpu_base), %o2 + stx %o1, [%o2 + %lo(__per_cpu_base)] #else mov 0, %o0 #endif sth %o0, [%g6 + TI_CPU] + call prom_init_report + nop + /* Off we go.... */ call start_kernel nop |