Add support to run SMM handler in TSEG instead of ASEG

[coreboot.git] / src / cpu / x86 / smm / smm_tseg.ld

diff --git a/src/cpu/x86/smm/smm_tseg.ld b/src/cpu/x86/smm/smm_tseg.ld
new file mode 100644 (file)
index 0000000..016b5a0
--- /dev/null
+++ b/src/cpu/x86/smm/smm_tseg.ld
@@ -0,0 +1,58 @@
+/* Maximum number of CPUs/cores */
+CPUS = 16;
+
+SECTIONS
+{
+       /* This is the actual SMM handler.
+        *
+        * We just put code, rodata, data and bss all in a row.
+        */
+       .handler (.): {
+               /* Assembler stub */
+               *(.handler)
+
+               /* C code of the SMM handler */
+               *(.text);
+               *(.text.*);
+
+               /* C read-only data of the SMM handler */
+               . = ALIGN(16);
+               *(.rodata)
+               *(.rodata.*)
+               *(.data.rel.ro.*)
+
+               /* C read-write data of the SMM handler */
+                . = ALIGN(4);
+               *(.data)
+
+               /* C uninitialized data of the SMM handler */
+                . = ALIGN(4);
+               *(.bss)
+               *(.sbss)
+
+               /* What is this? */
+               *(COMMON)
+                . = ALIGN(4);
+       }
+
+       /* We are using the TSEG interleaved to stuff the SMM handlers
+        * for all CPU cores in there. The jump table redirects the execution
+        * to the actual SMM handler
+        */
+       . = 0x8000 - (( CPUS - 1) * 0x400);
+       .jumptable : {
+               *(.jumptable)
+       }
+
+       /* Data used in early SMM TSEG handler. */
+       . = 0x8400;
+       .earlydata : {
+               *(.earlydata)
+       }
+
+       /DISCARD/ : {
+               *(.comment)
+               *(.note)
+               *(.note.*)
+       }
+}