diff options
| author | Aaron Durbin <adurbin@chromium.org> | 2017-06-16 15:16:13 -0500 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2017-06-27 16:14:15 +0000 |
| commit | 8ade68a2701603785d4acefc02ce3d7482b6beff (patch) | |
| tree | 60692857eb1ac3a0d035011c2de4ce890ff5894f /src/cpu/x86/smm/smm_stub.S | |
| parent | 604f69868ffc47c4cfc7623c83ccff89a0afcee8 (diff) | |
cpu/x86/smm: allow SSE instructions in SMM modules
If SSE instructions are enabled in the build assume the SMM
modules are compiled with SSE instructions. As such enable
the SSE instructions in SMM mode by setting up the cr4 register.
In addition, provide a place to save and restore the SSE state
in both the relocation handler and permanent handler.
Change-Id: Ifa16876b57544919fde88fba5b8f18e4ca286841
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/20244
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/cpu/x86/smm/smm_stub.S')
| -rw-r--r-- | src/cpu/x86/smm/smm_stub.S | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/src/cpu/x86/smm/smm_stub.S b/src/cpu/x86/smm/smm_stub.S index e1f6e5f9f2..824a26b858 100644 --- a/src/cpu/x86/smm/smm_stub.S +++ b/src/cpu/x86/smm/smm_stub.S @@ -36,6 +36,10 @@ c_handler: .long 0 c_handler_arg: .long 0 +fxsave_area: +.long 0 +fxsave_area_size: +.long 0 /* struct smm_runtime begins here. */ smm_runtime: smbase: @@ -122,6 +126,8 @@ smm_trampoline32: * not be assigned. Use the fallback stack and check this condition in * C handler. */ movl $(fallback_stack_top), %esp + /* Clear fxsave location as there will be no saving/restoring. */ + xor %edi, %edi jmp 2f 1: movl stack_size, %eax @@ -130,7 +136,33 @@ smm_trampoline32: subl %eax, %edx mov %edx, %esp + /* calculate fxsave location */ + mov fxsave_area, %edi + test %edi, %edi + jz 2f + movl fxsave_area_size, %eax + mul %ecx + add %eax, %edi + 2: + /* Save location of fxsave area. */ + push %edi + mov %esp, %ebp + test %edi, %edi + jz 1f + + /* Enable sse instructions. */ + mov %cr4, %eax + orl $(CR4_OSFXSR | CR4_OSXMMEXCPT), %eax + mov %eax, %cr4 + + /* Save FP state. */ + fxsave (%edi) + +1: + /* Align stack to 16 bytes. Another 16 bytes are pushed below. */ + andl $0xfffffff0, %esp + /* Call into the c-based SMM relocation function with the platform * parameters. Equivalent to: * struct arg = { c_handler_params, cpu_num, smm_runtime {; @@ -143,5 +175,16 @@ smm_trampoline32: mov c_handler, %eax call *%eax + /* Restore stack from call frame */ + mov %ebp, %esp + /* Retrieve fxsave location. */ + pop %edi + test %edi, %edi + jz 1f + + /* Restore FP state. */ + fxrstor (%edi) + +1: /* Exit from SM mode. */ rsm |