lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[ARM] Fix VFP initialisation issue for SMP systems

Browse Source 
When we install the handlers for context switching, we must enable
VFP on all CPU cores, otherwise undefined (and random) effects
occur.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2007-01-02 23:40:30 +00:00
committed by Russell King
parent 1c9d3df5e8
commit 8e140362f7
1 changed files with 15 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
arch/arm/vfp/vfpmodule.c
View File

@@ -264,6 +264,18 @@ void VFP9_bounce(u32 trigger, u32 fpexc, struct pt_regs *regs)
vfp_raise_exceptions(exceptions, trigger, orig_fpscr, regs); vfp_raise_exceptions(exceptions, trigger, orig_fpscr, regs);
} }
static void vfp_enable(void *unused)
{
u32 access = get_copro_access();
/*
* Enable full access to VFP (cp10 and cp11)
*/
set_copro_access(access | CPACC_FULL(10) | CPACC_FULL(11));
}
#include <linux/smp.h>
/* /*
* VFP support code initialisation. * VFP support code initialisation.
*/ */
@@ -288,6 +300,7 @@ static int __init vfp_init(void)
* we just need to read the VFPSID register. * we just need to read the VFPSID register.
*/ */
vfpsid = fmrx(FPSID); vfpsid = fmrx(FPSID);
barrier();
printk(KERN_INFO "VFP support v0.3: "); printk(KERN_INFO "VFP support v0.3: ");
if (VFP_arch) { if (VFP_arch) {
@@ -301,6 +314,8 @@ static int __init vfp_init(void)
} else if (vfpsid & FPSID_NODOUBLE) { } else if (vfpsid & FPSID_NODOUBLE) {
printk("no double precision support\n"); printk("no double precision support\n");
} else { } else {
smp_call_function(vfp_enable, NULL, 1, 1);
VFP_arch = (vfpsid & FPSID_ARCH_MASK) >> FPSID_ARCH_BIT; /* Extract the architecture version */ VFP_arch = (vfpsid & FPSID_ARCH_MASK) >> FPSID_ARCH_BIT; /* Extract the architecture version */
printk("implementor %02x architecture %d part %02x variant %x rev %x\n", printk("implementor %02x architecture %d part %02x variant %x rev %x\n",
(vfpsid & FPSID_IMPLEMENTER_MASK) >> FPSID_IMPLEMENTER_BIT, (vfpsid & FPSID_IMPLEMENTER_MASK) >> FPSID_IMPLEMENTER_BIT,