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authorKyle McMartin <kyle@mcmartin.ca>2008-07-29 00:11:13 -0400
committerKyle McMartin <kyle@hera.kernel.org>2008-10-10 16:32:30 +0000
commit089d55289db5d58d938d73b47a415b2b82ee19ac (patch)
tree4d7cdbc5a7dc8fb7fccf0d579f4296197f05f086
parentparisc: add pdc_coproc_cfg_unlocked and set_firmware_width_unlocked (diff)
downloadlinux-dev-089d55289db5d58d938d73b47a415b2b82ee19ac.tar.xz
linux-dev-089d55289db5d58d938d73b47a415b2b82ee19ac.zip
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.
-rw-r--r--arch/parisc/kernel/head.S2
-rw-r--r--arch/parisc/kernel/setup.c27
2 files changed, 27 insertions, 2 deletions
diff --git a/arch/parisc/kernel/head.S b/arch/parisc/kernel/head.S
index a84e31e82876..0e3d9f9b9e33 100644
--- a/arch/parisc/kernel/head.S
+++ b/arch/parisc/kernel/head.S
@@ -121,7 +121,7 @@ $pgt_fill_loop:
copy %r0,%r2
/* And the RFI Target address too */
- load32 start_kernel,%r11
+ load32 start_parisc,%r11
/* And the initial task pointer */
load32 init_thread_union,%r6
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
+}