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.
diff --git a/arch/parisc/kernel/head.S b/arch/parisc/kernel/head.S
index a84e31e..0e3d9f9 100644
--- a/arch/parisc/kernel/head.S
+++ b/arch/parisc/kernel/head.S
@@ -121,7 +121,7 @@
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 39e7c5a..a59b71e 100644
--- a/arch/parisc/kernel/setup.c
+++ b/arch/parisc/kernel/setup.c
@@ -368,6 +368,31 @@
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
+}