diff options
| author | Eric Biederman <ebiederm@xmission.com> | 2003-07-01 06:51:27 +0000 |
|---|---|---|
| committer | Eric Biederman <ebiederm@xmission.com> | 2003-07-01 06:51:27 +0000 |
| commit | 57fa1b8279d78b3083b086708d857422ed99beca (patch) | |
| tree | a6f2e83cae06715d95b8f38cb5a5f009824579d0 /src/cpu | |
| parent | c22ea4f00d4a0f12c8d31a36fe9853cb18c62c9c (diff) | |
- Code to enable and disable use of the sse and mmx registers
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@930 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/k8/disable_mmx_sse.inc | 27 | ||||
| -rw-r--r-- | src/cpu/k8/enable_mmx_sse.inc | 14 |
2 files changed, 41 insertions, 0 deletions
diff --git a/src/cpu/k8/disable_mmx_sse.inc b/src/cpu/k8/disable_mmx_sse.inc new file mode 100644 index 0000000000..5ce9dfdc1f --- /dev/null +++ b/src/cpu/k8/disable_mmx_sse.inc @@ -0,0 +1,27 @@ + /* Clear out an mmx state */ + emms + + /* + * Put the processor back into a reset state + * with respect to the xmm registers. + */ + + pxor %xmm0, %xmm0 + pxor %xmm1, %xmm1 + pxor %xmm2, %xmm2 + pxor %xmm3, %xmm3 + pxor %xmm4, %xmm4 + pxor %xmm5, %xmm5 + pxor %xmm6, %xmm6 + pxor %xmm7, %xmm7 + + /* Disable floating point emulation */ + movl %cr0, %eax + andl $~(1<<2), %eax + movl %eax, %cr0 + + /* Disable sse instructions */ + movl %cr4, %eax + andl $~(3<<9), %eax + movl %eax, %cr4 + diff --git a/src/cpu/k8/enable_mmx_sse.inc b/src/cpu/k8/enable_mmx_sse.inc new file mode 100644 index 0000000000..5551525d68 --- /dev/null +++ b/src/cpu/k8/enable_mmx_sse.inc @@ -0,0 +1,14 @@ + /* + * Enabling mmx registers is a noop + * Enable the use of the xmm registers + */ + + /* Disable floating point emulation */ + movl %cr0, %eax + andl $~(1<<2), %eax + movl %eax, %cr0 + + /* Enable sse instructions */ + movl %cr4, %eax + orl $(1<<9), %eax + movl %eax, %cr4 |