Frank Vibrans III (frank.vibrans@amd.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/113
-gerrit
commit 919a8b814d683d83d0f40c3df5d04880753ae5e8 Author: efdesign98 efdesign98@gmail.com Date: Wed Jul 20 20:11:46 2011 -0600
Add SSE3 dependent code
This change separates out changes that were initially found in the commit for XHCI and AHCI changes to "arch/x86/Makefile. inc". It also corrects a comment. The SSE3 dependent code adds a pair of CR4 access functions and a blob of code that re-sets CR4.OSFXSR and CR4.OSXMMEXCPT.
Change-Id: Id97256978da81589d97dcae97981a049101b5258 Signed-off-by: Frank Vibrans frank.vibrans@amd.com Signed-off-by: efdesign98 efdesign98@gmail.com --- src/cpu/x86/lapic/lapic_cpu_init.c | 33 ++++++++++++++++++++++++++++++++- 1 files changed, 32 insertions(+), 1 deletions(-)
diff --git a/src/cpu/x86/lapic/lapic_cpu_init.c b/src/cpu/x86/lapic/lapic_cpu_init.c old mode 100644 new mode 100755 index 53bbe79..fc22ea4 --- a/src/cpu/x86/lapic/lapic_cpu_init.c +++ b/src/cpu/x86/lapic/lapic_cpu_init.c @@ -262,7 +262,7 @@ int start_cpu(device_t cpu)
if (result) { result = 0; - /* Wait 1s or until the new the new cpu calls in */ + /* Wait 1s or until the new cpu calls in */ for(count = 0; count < 100000 ; count++) { if (secondary_stack == 0) { result = 1; @@ -338,6 +338,26 @@ void stop_this_cpu(void) } #endif
+#ifdef __SSE3__ +static __inline__ __attribute__((always_inline)) unsigned long readcr4(void) +{ + unsigned long value; + __asm__ __volatile__ ( + "mov %%cr4, %[value]" + : [value] "=a" (value)); + return value; +} + +static __inline__ __attribute__((always_inline)) void writecr4(unsigned long Data) +{ + __asm__ __volatile__ ( + "mov %%eax, %%cr4" + : + : "a" (Data) + ); +} +#endif + /* C entry point of secondary cpus */ void secondary_cpu_init(void) { @@ -347,6 +367,17 @@ void secondary_cpu_init(void) spin_lock(&start_cpu_lock); #endif #endif + +#ifdef __SSE3__ + /* + * Seems that CR4 was cleared when AP start via lapic_start_cpu() + * Turn on CR4.OSFXSR and CR4.OSXMMEXCPT when SSE options enabled + */ + u32 cr4_val; + cr4_val = readcr4(); + cr4_val |= (1 << 9 | 1 << 10); + writecr4(cr4_val); +#endif cpu_initialize(); #if CONFIG_SERIAL_CPU_INIT == 1 #if CONFIG_MAX_CPUS>2