From 089d55289db5d58d938d73b47a415b2b82ee19ac Mon Sep 17 00:00:00 2001 From: Kyle McMartin Date: Tue, 29 Jul 2008 00:11:13 -0400 Subject: parisc: hijack jump to start_kernel Bang in our own start_parisc call, which initializes the PDC width, and turns on the FPU. Previously, if CONFIG_PRINTK_TIME was on, we'd attempt to use the FPU before we had enabled it, resulting in a difficult to diagnose panic. This patch causes init_per_cpu to redundantly set these for cpu0, but this is harmless. --- arch/parisc/kernel/setup.c | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) (limited to 'arch/parisc/kernel/setup.c') diff --git a/arch/parisc/kernel/setup.c b/arch/parisc/kernel/setup.c index 39e7c5a5946a..a59b71efdbe5 100644 --- a/arch/parisc/kernel/setup.c +++ b/arch/parisc/kernel/setup.c @@ -368,6 +368,31 @@ static int __init parisc_init(void) return 0; } - arch_initcall(parisc_init); +void start_parisc(void) +{ + extern void start_kernel(void); + + int ret, cpunum; + struct pdc_coproc_cfg coproc_cfg; + + cpunum = smp_processor_id(); + + set_firmware_width_unlocked(); + + ret = pdc_coproc_cfg_unlocked(&coproc_cfg); + if (ret >= 0 && coproc_cfg.ccr_functional) { + mtctl(coproc_cfg.ccr_functional, 10); + + cpu_data[cpunum].fp_rev = coproc_cfg.revision; + cpu_data[cpunum].fp_model = coproc_cfg.model; + + asm volatile ("fstd %fr0,8(%sp)"); + } else { + panic("must have an fpu to boot linux"); + } + + start_kernel(); + // not reached +} -- cgit v1.2.3-59-g8ed1b